WO2023040787A1 - Cell handover method and communication apparatus - Google Patents

Cell handover method and communication apparatus Download PDF

Info

Publication number
WO2023040787A1
WO2023040787A1 PCT/CN2022/118252 CN2022118252W WO2023040787A1 WO 2023040787 A1 WO2023040787 A1 WO 2023040787A1 CN 2022118252 W CN2022118252 W CN 2022118252W WO 2023040787 A1 WO2023040787 A1 WO 2023040787A1
Authority
WO
WIPO (PCT)
Prior art keywords
handover
cell
fallback
measurement information
terminal device
Prior art date
Application number
PCT/CN2022/118252
Other languages
French (fr)
Chinese (zh)
Inventor
郑午阳
耿婷婷
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2023040787A1 publication Critical patent/WO2023040787A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present application relates to the communication field, and more specifically, to a cell handover method and a communication device.
  • a terminal device may need to perform a handover process due to factors such as movement, so as to switch from a source cell to a target cell for data transmission.
  • switching failure may occur.
  • a terminal device reselects a target cell and performs a cell handover process again, but such a process is not efficient.
  • Embodiments of the present disclosure provide a cell switching solution.
  • a cell handover method includes: a terminal device performs a handover process from a source cell to a first target cell, and the first target cell belongs to a set of candidate cells; the terminal device determines that a handover failure occurs during the handover process; the terminal device determines rollback indication information, and the rollback indication The information at least indicates whether to fall back to the source cell when the handover fails; and when the fallback indication information indicates to fall back to the source cell when the handover fails, the terminal device performs a fallback operation to the source cell.
  • the fallback indication information is used to indicate whether the terminal device falls back to the source cell after a handover failure occurs during the handover process, so that the terminal device can perform a fallback operation based on the fallback indication information, thereby simplifying the terminal
  • the operation of the equipment improves the switching efficiency.
  • the method further includes: when the elapsed time from initiating the handover process reaches a first preset time period or when the number of handover failures reaches a threshold, the terminal device executes the cell selection process.
  • the terminal device when the elapsed time reaches a first preset time period or the number of occurrences of a specific event reaches a number threshold, the terminal device performs a cell selection process; wherein the first preset time period
  • the starting moment may be when the first handover configuration message is received, when the handover process is started, or when handover failure occurs; the specific event may be when handover failure occurs, when rollback occurs, when rollback is successful, or when handover is triggered .
  • the fallback is limited by the first preset time period or the number of times threshold, so as to avoid the complexity of the terminal device caused by an infinite number of fallbacks, and also avoid excessive energy consumption of the terminal device.
  • the method further includes: when it is determined that the fallback operation fails, the terminal device performs a cell selection process.
  • the terminal device can perform a cell selection process after the fallback operation fails, thereby avoiding transmission interruption caused by the fallback failure of the terminal device, and improving handover efficiency.
  • the method further includes: when the fallback instruction information indicates not to fallback to the source cell when the handover fails, the terminal device performs a cell selection process.
  • the terminal device can perform a cell selection process based on the fallback indication information, and avoid transmission interruption caused by handover failure. Through the cell selection process, a more suitable cell can be found as soon as possible, thereby ensuring switching efficiency.
  • the rollback indication information further indicates at least one of the following: a first preset time period or a times threshold.
  • the terminal device sends a first message to the network device of the source cell, and the first message indicates at least one of the following: a first preset time period or a threshold value of times; a handover type of the handover process ; The number of handover failures; the time when handover failures occur; the first time period from initiating the handover process to the occurrence of handover failures; the first measurement information for the first target cell when handover failures occur; when handover failures occur The second measurement information for the source cell; the third measurement information for other candidate cells in the candidate cell set when handover failure occurs; whether to perform rollback; the number of successful rollbacks; the time when the rollback is successful; the rollback is successful. The fourth measurement information for the first target cell when the fallback is successful; the fifth measurement information for the source cell when the fallback is successful; the sixth measurement information for other candidate cells when the fallback is successful; The second duration; whether the fallback fails; the time when the fallback fails; the seventh measurement information for
  • the terminal device can report all aspects of handover failure information to the network device of the source cell through the first message, so that the network device can understand the handover process more comprehensively, facilitating further optimization of mobility management.
  • the terminal device further includes: when the cell selection process selects a second target cell in the candidate cell set, the terminal device performs a handover process to the second target cell; when the cell selection process selects a second target cell that does not belong to When the second target cell of the candidate cell set is used, the terminal device performs a radio resource control RRC re-establishment process with the second target cell; or when a suitable cell cannot be found within the second preset time period, the terminal device switches to an idle state.
  • the terminal device when the cell selection process selects the second target cell, the terminal device performs an RRC re-establishment process with the second target cell; or when the second target cell cannot be When a suitable cell is found, the terminal equipment transitions to the idle state.
  • a new cell can be determined through the cell selection process, and operations such as cell handover can be performed on the new cell, thereby ensuring handover continuity of the terminal device and improving handover efficiency.
  • the terminal device sends a second message, and the second message indicates at least one of the following: the first A preset time period or times threshold; the handover type of the handover process; the number of handover failures; the time when the handover failure occurs; The first measurement information of a target cell; the second measurement information for the source cell when a handover failure occurs; the third measurement information for other candidate cells in the candidate cell set when a handover failure occurs; whether to perform rollback; rollback The number of times of success; the time when the rollback is successful; the fourth measurement information for the first target cell when the rollback is successful; the fifth measurement information for the source cell when the rollback is successful; the other measurement information for the candidate cell set when the rollback is successful; The sixth measurement information of the candidate cell; the second duration from the handover failure to the rollback success; whether the rollback fails; the time when the rollback fails; the seventh measurement information for the first target
  • the terminal device can report various aspects of the handover process to the network device of the source cell through the second message, so that the network device can understand the handover process more comprehensively, and facilitate mobility management. further optimization.
  • the fallback indication information is received from the network device of the source cell, or the fallback indication information is preconfigured in the terminal device.
  • a method for cell handover includes: the network device sends fallback instruction information to the terminal device, the fallback instruction information at least indicates whether to fall back to the source cell when the handover fails, and the network device is the network device of the source cell when the terminal device performs a handover process; and when When the terminal device fails in handover during the handover process and the fallback indication information indicates that the terminal device falls back to the source cell when the handover fails, the network device performs an operation of connecting with the terminal device based on the fallback operation of the terminal device.
  • the network device receives a handover report message from the terminal device, and the handover report message indicates at least one of the following: a first preset time period or a threshold value of times; a handover type of the handover process; occurrence The number of handover failures; the time when the handover failure occurs; the first duration from the initiation of the handover process to the occurrence of the handover failure; the first measurement information for the first target cell to which the handover process is handed over when the handover failure occurs; The second measurement information for the source cell when the handover failure occurs; the third measurement information for other candidate cells in the candidate cell set when the handover failure occurs; whether to perform rollback; the number of successful rollbacks; the time when the rollback is successful ; The fourth measurement information for the first target cell when the fallback is successful; the fifth measurement information for the source cell when the fallback is successful; the sixth measurement information for other candidate cells when the fallback is successful; From handover failure to fallback The second duration between successes; whether the
  • a communication device in a third aspect, includes: a handover module configured to perform a handover process from a source cell to a first target cell, where the first target cell belongs to a set of candidate cells; a first determination module configured to determine that a handover failure occurs during the handover process; The second determination module is configured to determine the fallback indication information, and the fallback indication information at least indicates whether to fall back to the source cell when the handover fails; and the fallback module is configured to fall back when the fallback indication information indicates that the handover fails. When returning to the source cell, execute the fallback operation to the source cell.
  • the communication device may be used to implement the first aspect or the method described in any embodiment of the first aspect.
  • a communication device in a fourth aspect, includes: a sending module configured to send fallback indication information to the terminal equipment, the fallback indication information at least indicates whether to fall back to the source cell when the handover fails, and the communication device is the source cell when the terminal equipment performs the handover process a network device; and a connection module configured to perform a communication with the terminal device based on the fallback operation of the terminal device when the terminal device fails to switch during the handover process and the fallback indication information indicates that the switch fails to fall back to the source cell Perform the connection operation.
  • the communication device may be used to implement the second aspect or the method described in any embodiment of the second aspect.
  • a terminal device in a fifth aspect, includes a processor and a memory, and the memory stores instructions executed by the processor.
  • the terminal device realizes: performing a handover process from the source cell to the first target cell, the first target cell Belonging to the set of candidate cells; determining that a handover failure occurs during the handover process; determining fallback indication information, the fallback indication information at least indicates whether to fall back to the source cell when the handover fails; When arriving at the source cell, perform a fallback operation to the source cell.
  • the processor executes instructions so that the terminal device realizes: when the time elapsed from initiating the handover process reaches a first preset time period or when the number of times of handover failures reaches a threshold value, execute Cell selection process.
  • the processor executes instructions to enable the terminal device to implement: when the elapsed time reaches a first preset time period or the number of occurrences of a specific event reaches a number threshold, execute a cell selection process; wherein the first The starting moment of the preset time period may be when the first handover configuration message is received, when the handover process is started, or when handover failure occurs; the specific event may be when handover failure occurs, when rollback occurs, and when rollback succeeds , or when switching is triggered.
  • the processor executes instructions so that the terminal device implements: when it is determined that the rollback operation fails, perform a cell selection process.
  • the processor executes instructions so that the terminal device implements: when the fallback indication information indicates not to fall back to the source cell when the handover fails, execute a cell selection process.
  • the rollback indication information further indicates at least one of the following: a first preset time period or a times threshold.
  • the processor executes instructions to enable the terminal device to: send a first message to the network device of the source cell via a transceiver, and the first message indicates at least one of the following: a first preset time period or The number of thresholds; the handover type of the handover process; the number of handover failures; the time when the handover failure occurs; the first duration from the initiation of the handover process to the handover failure; Measurement information; second measurement information for the source cell when handover failure occurs; third measurement information for other candidate cells in the candidate cell set when handover failure occurs; whether to perform rollback; the number of successful rollbacks; rollback The time when it succeeds; the fourth measurement information for the first target cell when the rollback is successful; the fifth measurement information for the source cell when the rollback is successful; the sixth measurement information for other candidate cells when the rollback is successful; The second duration between the failure and the rollback success; whether the rollback failed; the time when the rollback failed; the seventh measurement information for the first target cell when the roll
  • the processor executes instructions to cause the terminal device to implement: when the cell selection process selects the second target cell in the candidate cell set, perform a handover process to the second target cell; when the cell selection When the process selects a second target cell that does not belong to the candidate cell set, execute the radio resource control RRC re-establishment process with the second target cell; or when a suitable cell cannot be found within the second preset time period, switch to the idle state .
  • the processor executes instructions so that the terminal device realizes: when the cell selection process selects the second target cell, execute the RRC re-establishment process with the second target cell; or when the second preset When a suitable cell cannot be found within the set time period, it will switch to the idle state.
  • the processor executes instructions so that the terminal device realizes: when the cell selection process selects the second target cell and successfully switches to the second target cell, sending the second message via the transceiver, the second The message indicates at least one of the following: a first preset time period or a threshold value of times; a handover type of the handover process; the number of handover failures; the time when the handover failure occurs; ; first measurement information for the first target cell when handover failure occurs; second measurement information for the source cell when handover failure occurs; third measurement information for other candidate cells in the candidate cell set when handover failure occurs ;Whether to perform fallback; the number of successful fallbacks; the time when the fallback is successful; the fourth measurement information for the first target cell when the fallback is successful; the fifth measurement information for the source cell when the fallback is successful; the fallback is successful.
  • the fallback indication information is received from the network device of the source cell, or the fallback indication information is preconfigured in the terminal device.
  • a network device in a sixth aspect, includes a processor and a memory, and the memory stores instructions executed by the processor.
  • the network device realizes: sending fallback instruction information to the terminal device via a transceiver, the fallback instruction information being at least Indicate whether to fall back to the source cell when the handover fails, and the network device is the network device of the source cell when the terminal device performs the handover process;
  • the network device When falling back to the source cell, an operation of connecting with the terminal device is performed based on the fallback operation of the terminal device.
  • the processor executes instructions to enable the network device to: receive a handover report message from the terminal device via a transceiver, and the handover report message indicates at least one of the following: a first preset time period or a threshold of times ;The handover type of the handover process; the number of handover failures; the time when the handover failure occurs; the first duration from the initiation of the handover process to the handover failure; the first target for the handover process when the handover failure occurs The first measurement information of the cell; the second measurement information for the source cell when a handover failure occurs; the third measurement information for other candidate cells in the candidate cell set when a handover failure occurs; whether to perform rollback; whether the rollback is successful The number of times; the time when the rollback is successful; the fourth measurement information for the first target cell when the rollback is successful; the fifth measurement information for the source cell when the rollback is successful; the sixth measurement information for other candidate cells when the rollback is successful ;The second duration from the handover failure to
  • a computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the computer-readable storage medium according to the above-mentioned first aspect or any embodiment thereof is implemented.
  • a chip or a chip system includes a processing circuit configured to perform operations according to the method in the above first aspect or any embodiment thereof, or perform operations according to the method in the above second aspect or any embodiment thereof.
  • a computer program or computer program product is provided.
  • the computer program or computer program product is tangibly stored on a computer-readable medium and comprises computer-executable instructions which, when executed, implement the operations according to the method in the above-mentioned first aspect or any of its embodiments, Or implement the operations according to the method in the above second aspect or any embodiment thereof.
  • FIG. 1 shows an interactive signaling diagram of a conventional handover process in which a terminal device is handed over from a source cell to a target cell;
  • FIG. 2 shows a schematic diagram of a communication system in which embodiments of the present disclosure can be implemented
  • FIG. 3 shows an interactive signaling diagram of a handover process in which a terminal device is successfully handed over from a source cell to a target cell according to some embodiments of the present disclosure
  • Fig. 4 shows a schematic flowchart of a process in which a terminal device performs cell handover according to some embodiments of the present disclosure
  • Figure 5 shows a schematic flowchart of a process performed by a terminal device after a handover failure occurs according to some embodiments of the present disclosure
  • FIG. 6 shows a schematic flowchart of a process for cell handover according to some embodiments of the present disclosure
  • Fig. 7 shows a schematic block diagram of a communication device for cell handover according to some embodiments of the present disclosure
  • FIG. 8 shows another schematic block diagram of a communication device for cell handover according to some embodiments of the present disclosure.
  • Fig. 9 shows a schematic block diagram of an example device that may be used to implement embodiments of the present disclosure.
  • Embodiments of the present disclosure can be implemented according to appropriate communication protocols, including but not limited to, third generation (3rd Generation, 3G), fourth generation (4G), fifth generation (5G) and other cellular communication protocols, such as electrical and Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers, IEEE) 802.11 and other wireless local area network communication protocols, future evolved mobile communication systems such as 6G communication system protocols, and/or other protocols currently known or developed in the future.
  • 3G Third generation
  • 4G fourth generation
  • 5G fifth generation
  • other cellular communication protocols such as electrical and Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers, IEEE) 802.11 and other wireless local area network communication protocols, future evolved mobile communication systems such as 6G communication system protocols, and/or other protocols currently known or developed in the future.
  • the technical solution of the embodiment of the present disclosure is applied to a communication system following any appropriate communication protocol, such as: Universal Mobile Telecommunications System (Universal Mobile Telecommunications Service, UMTS), Long Term Evolution (Long Term Evolution, LTE) system, wideband code division multiple access System (Wideband Code Division Multiple Access, WCDMA), Code Division Multiple Access 2000 system (Code Division Multiple Access, CDMA2000), Time Division Synchronization Code Division Multiple Access system (Time Division-Synchronization Code Division Multiple Access, TD-SCDMA), frequency division Duplex (Frequency Division Duplex, FDD) system, Time Division Duplex (Time Division Duplex, TDD), fifth generation (5G) system or new radio (New Radio, NR), future evolution of 6G communication system, etc.
  • Universal Mobile Telecommunications System Universal Mobile Telecommunications Service, UMTS
  • Long Term Evolution Long Term Evolution, LTE
  • WCDMA Wideband Code Division Multiple Access
  • CDMA2000 Code Division Multiple Access 2000 system
  • Time Division Synchronization Code Division Multiple Access system Time Division
  • embodiments of the present disclosure are described below in the context of an NR communication system in 3GPP. However, it should be understood that the embodiments of the present disclosure are not limited to this communication system, but can be applied to any communication system with similar problems, such as wireless local area network (WLAN), wired communication system, or other communication systems developed in the future, etc. .
  • WLAN wireless local area network
  • wired communication system or other communication systems developed in the future, etc.
  • terminal device refers to any terminal device capable of wired or wireless communication with network devices or with each other.
  • the terminal equipment may sometimes be called user equipment (User Equipment, UE).
  • a terminal device may be any type of mobile terminal, stationary terminal or portable terminal.
  • terminal equipment may include a mobile handset, station, unit, device, mobile terminal (Mobile Terminal, MT), subscription station, portable subscription station, Internet node, communicator, desktop computer, laptop computer, notebook computer, tablet Computers, personal communication system devices, personal navigation devices, personal digital assistants (Personal Digital Assistant, PDA), positioning devices, radio broadcast receivers, e-book devices, game devices, Internet of Things (IoT) devices, vehicle-mounted devices , aircraft, virtual reality (Virtual Reality, VR) devices, augmented reality (Augmented Reality, AR) devices, wearable devices, terminal devices in 5G networks or evolved Public Land Mobile Networks (Public Land Mobile Network, PLMN) Any terminal device, other device that can be used for communication, or any combination of the above. Embodiments of the present disclosure do not limit this.
  • the term "network device” used in this disclosure is an entity or node that can be used to communicate with a terminal device, such as an access network device.
  • the access network device may be a device deployed in the radio access network to provide a wireless communication function for the mobile terminal, for example, it may be a radio access network (Radio Access Network, RAN) network device.
  • Access network equipment may include various types of base stations. As an example, the access network equipment may include various forms of macro base stations, micro base stations, pico base stations, femto base stations, relay stations, access points, remote radio units (Remote Radio Unit, RRU), radio heads (Radio Head, RH ), Remote Radio Head (RRH) and so on.
  • RRU Remote Radio Unit
  • RH Remote Radio Head
  • the names of access network equipment may be different, for example, in a Long Term Evolution (LTE) network, it is called an evolved NodeB (evolved NodeB, eNB or eNodeB), which is called Node B (NodeB, NB) in 3G network, can be called gNode B (gNB) or NR Node B (NR NB) in 5G network, and so on.
  • the access network device may include a central unit (Central Unit, CU) and/or a distributed unit (Distributed Unit, DU).
  • CU and DU can be placed in different places, for example: DU is remote and placed in a high-traffic area, and CU is placed in the central computer room.
  • the CU and DU can also be placed in the same equipment room.
  • the CU and DU can also be different components under one rack.
  • the above-mentioned apparatuses for providing wireless communication functions for mobile terminals are collectively referred to as network devices, which are not specifically limited in the embodiments of the present disclosure.
  • FIG. 1 shows an interactive signaling diagram of a conventional handover process 100 in which a terminal device is handed over from a source cell to a target cell.
  • FIG. 1 involves a terminal device 101 , a network device 102 of a source cell, and a network device 103 of a target cell.
  • the network device 102 of the source cell sends 110 a handover request to the network device 103 of the target cell.
  • the source cell initiates the handover, and the network device 102 of the source cell may send a handover request via the Xn interface between the network device 102 of the source cell and the network device 103 of the target cell.
  • the handover request may include at least the identifier of the terminal device 101 .
  • the network device 103 of the target cell performs 120 admission control (Admission control). Specifically, the network device 103 of the target cell may determine the radio resource control (Radio Resource Control, RRC) reconfiguration information required by the terminal device 101 for handover based on the handover request.
  • RRC Radio Resource Control
  • the RRC reconfiguration information may include a cell identity of the target cell and access information required by the terminal device 101 to access the target cell.
  • the network device 103 of the target cell sends 130 a handover request confirmation message to the network device 102 of the source cell, where the handover request confirmation message includes RRC reconfiguration information.
  • the network device 102 of the source cell sends 140 a handover message to the terminal device 101, where the handover message includes RRC reconfiguration information. Specifically, after receiving the handover request confirmation message, the network device 102 of the source cell can extract the RRC reconfiguration information therefrom, and forward the RRC reconfiguration information to the terminal device 101 through a handover message.
  • the handover message may carry RRC reconfiguration information through a mobility control information (MobilityControlInfo) information element.
  • MobilityControlInfo mobility control information
  • the handover message may carry RRC reconfiguration information through a reconfiguration with sync (ReconfigurationWithSync) information element.
  • the terminal device 101 handovers 150 to the target cell based on the RRC reconfiguration information. Specifically, the terminal device 101 can access the target cell based on the RRC reconfiguration information without acquiring system information from the network device 103 of the target cell. Subsequently, the terminal device 101 sends 160 an RRC reconfiguration complete message to the network device 103 of the target cell.
  • the handover process of the terminal device 101 from the source cell to the target cell can be realized.
  • the network device 102 of the source cell sends a handover message to the terminal device 101 (that is, 140 in FIG. 1 )
  • the data transmission between the network device 102 of the source cell and the terminal device 101 is also interrupted.
  • the terminal device 101 sends an RRC reconfiguration complete message (ie 160 in FIG. 1 ) to the network device 103 of the target cell
  • the network device 103 of the target cell starts data transmission with the terminal device 101 .
  • there is an interruption delay if a handover failure occurs in the process 100 as shown in FIG. 1 , the terminal device 101 needs to re-execute cell selection, which leads to low handover efficiency.
  • embodiments of the present disclosure provide a solution for cell handover.
  • whether to fall back to the source cell can be determined based on the fallback indication information, which can improve the efficiency of handover.
  • FIG. 2 shows a schematic diagram of a communication system 200 in which embodiments of the present disclosure may be implemented.
  • the system 200 shown in FIG. 2 includes a terminal device 210 , the terminal device 210 is located in a cell 222 , and the network device of the cell 222 is a network device 232 . Also shown in FIG. 2 are cell 224 and cell 226 , and network device 234 of cell 224 and network device 236 of cell 226 .
  • Terminal device 210 is capable of communicating with network device 232 .
  • the terminal device 210 may reach the edge of the cell 222, or the signal quality between the network device 232 and the terminal device 210 may deteriorate, thereby triggering a cell handover process.
  • the cell 222 where the terminal device 210 is currently located may be called a source cell, and the network device 232 of the cell 222 may be called a source network device accordingly.
  • the cell 224 may be called a first target cell, and the network device 234 may be called a first target network device accordingly.
  • cell 226 may be called a second target cell, and network device 236 may be called a second target network device accordingly.
  • the cell 224 and the cell 226 may be collectively referred to as a candidate (candidate) cell.
  • FIG. 2 is only a schematic diagram. Although two target cells, cell 224 and cell 226 are shown in FIG. 2 , the embodiments of the present disclosure do not limit the number of target cells. In addition, it should also be understood that terms such as source cell, candidate cell, and target cell are only illustrative, and the terms may vary for different terminal devices or different handover scenarios, and details are not repeated here.
  • Fig. 3 shows an interactive signaling diagram of a handover process 300 in which a terminal device is successfully handed over from a source cell to a target cell according to some embodiments of the present disclosure.
  • process 300 involves end device 210 , source network device 232 , first target network device 234 , and second target network device 236 . That is to say, the process 300 is described by taking the switching process of the terminal device 210 as an example. It can be understood that this process is also applicable to the switching of other terminal devices, and details are not repeated here.
  • the source network device 232 sends 302 the measurement configuration information to the terminal device 210 .
  • the terminal device 210 performs 304 measurements based on the measurement configuration information, and the terminal device 210 sends 306 a measurement report to the source network device 232 .
  • the terminal device 210 may periodically perform measurement and correspondingly periodically send a measurement report.
  • the measurement report may include the measurement results of each cell (such as the cell 222, the cell 224, and the cell 226) measured by the terminal device 210, such as at least one of the following: Signal to Interference plus Noise Ratio (SINR), received signal Strength (Received Signal Strength Indication, RSSI), Reference Signal Received Power (Reference Signal Received Power, RSRP), Reference Signal Received Quality (Reference Signal Received Quality, RSRQ), etc.
  • SINR Signal to Interference plus Noise Ratio
  • RSSI received Signal Strength
  • RSSI Reference Signal Received Power
  • RSRP Reference Signal Received Power
  • Reference Signal Received Quality Reference Signal Received Quality
  • the source network device 232 determines 308 the handover type.
  • the handover type in the embodiments of the present disclosure may be a hybrid handover type, or may also be called a dual active protocol stack (Dual Active Protocol Stack, DAPS) handover and a conditional handover (Conditional Handover, CHO) composite type, which is simplified as DAPS+ Cho.
  • DAPS Dual Active Protocol Stack
  • CHO conditional handover
  • the handover type may be DAPS handover, or the handover type may be CHO, or the handover type may be other types, which will not be listed here.
  • the source network device 232 sends 310 a handover request to the network device of each candidate cell in the candidate cell set. Specifically, the source network device 232 sends 3102 a first handover request to the first target network device 234 , and sends 3104 a second handover request to the second target network device 236 .
  • the set of candidate cells includes at least one candidate cell, and the at least one candidate cell can be determined by the source network device 232 based on the measurement report, and it can be understood that the number of at least one candidate cell is determined based on actual conditions, for example, it can be 1 or 2 or more etc.
  • the embodiment herein shows that the set of candidate cells includes the first target cell 224 and the second target cell 226, the present disclosure is not limited thereto.
  • the network device 234/236 of at least one candidate cell performs 312 admission control. Specifically, the first target network device 234 performs 3122 admission control, and the second target network 236 performs 3124 admission control.
  • the network device 234/236 of at least one candidate cell sends 314 a handover request confirmation message to the source network device 232 .
  • the first target network device 234 sends 3142 a first handover request confirmation message to the source network device 232 , where the first handover request confirmation message may include first configuration information of the first target network device 234 .
  • the second target network device 236 sends 3144 a second handover request acknowledgment message to the source network device 232 , where the second handover request acknowledgment message may include second configuration information of the second target network device 236 .
  • the source network device 232 sends 316 an RRC reconfiguration message to the terminal device 210, where the RRC reconfiguration message may include handover configuration information and handover conditions of at least one candidate cell (cell 224 and cell 226).
  • the source network device 232 may send an RRC reconfiguration message when the link quality between the source network device 232 and the terminal device 210 is higher than a certain set threshold, so as to ensure that the terminal device 210 successfully receives the RRC reconfiguration message information.
  • the handover configuration information of the candidate cell may include an identifier of the candidate cell and frequency information corresponding to the candidate cell, where the identifier may be a Cell Global Identifier (CGI) or a Physical Cell Identifier (Physical Cell Identifier, PCI). Additionally or alternatively, the handover configuration information of the candidate cell may include DAPS configuration information of the candidate cell.
  • the DAPS configuration information may include indication information of a data radio bearer (Data Radio Bearer, DRB) supporting DAPS, and/or may include power information between two network devices when using DAPS.
  • DRB Data Radio Bearer
  • the source network device 232 may also send fallback indication information to the terminal device 210, which is used to indicate whether the terminal device 210 performs a fallback operation when a handover failure occurs.
  • the fallback indication information may be included in an RRC reconfiguration message or the fallback indication information may be included in another message.
  • fallback (fall back) may refer to the process of re-establishing the RRC connection between the terminal device 210 and the source network device 232 when the terminal device 210 fails to switch (such as DAPS HO, CHO, or DAPS+CHO) .
  • the source network device 232 may also send other reconfiguration messages to the terminal device 210 to inform the terminal device 210 of the handover configuration information of at least one candidate cell.
  • the terminal device 210 sends 318 an RRC reconfiguration complete message to the source network device 232 .
  • the period from 302 to 318 in FIG. 3 may be referred to as a handover preparation (HO preparation) period.
  • HO preparation handover preparation
  • the forwarding path forwarding tunnel
  • the forwarding path from the source network device 232 to the first target network device 234 and the source network device 234 have been established.
  • a forwarding path from the network device 232 to the second target network device 236 has been established.
  • source network device 232 sends 320 an EARLY STATUS TRANSFER message to first target network device 234 and second target network device 236 .
  • early data forwarding can also be triggered. Taking DL data transmission as an example, the source network device 232 may forward the downlink data to the first target network device 234 and the second target network device 236 .
  • the source network device 232 is responsible for allocating a downlink packet data convergence protocol (Packet Data Convergence Protocol, PDCP) serial number (Serial Number, SN) until the SN allocation is switched to The first target network device 234 . That is to say, the source network device 232 will stop allocating the downlink PDCP SN after receiving the handover success message (330 below) from the first target network device 234.
  • PDCP Packet Data Convergence Protocol
  • SN Serial Number
  • the terminal device 210 evaluates 322 the handover condition. Specifically, the terminal device 210 maintains the connection with the source network device 232 after receiving the handover configuration information, and the terminal device 210 starts to evaluate the handover condition for at least one candidate cell.
  • the terminal device 210 selects 324 a target cell. Specifically, the terminal device 210 may determine whether there is a candidate cell satisfying the handover condition by evaluating the handover condition. If there is a candidate cell that satisfies the handover condition, the terminal device 210 may select the target cell. In FIG. 3 , it is assumed that the terminal device 210 selects the first target cell 224, wherein the first target cell 224 belongs to the candidate cell set.
  • the terminal device 210 is handed over 326 to the first target cell 224 . Specifically, the terminal device 210 may handover to the first target cell 224 based on the previously acquired handover configuration information of the first target cell 224 .
  • the terminal device 210 sends 328 an RRC reconfiguration complete message to the first target network device 234 .
  • HO execution handover execution
  • 329 to 334 in FIG. 3 may be referred to as a handover completion (HO Completion) period.
  • the terminal device 210 detaches 329 from the source cell 222 . That is, the terminal device 210 may release the connection with the source cell 222 .
  • the first target network device 234 sends 330 a handover success message to the source network device 232 .
  • the handover success message is used to notify the source network device 232 that the terminal device 210 has successfully connected to the first target network device 234 . Therefore, the source network device 232 stops data transmission with the terminal device 210 .
  • the source network device 232 sends 332 an SN state transfer message to the first target network device 234 , the SN state transfer message may include the last data transmission sequence number assigned by the source network device 232 .
  • the source network device 234 may also initiate later data forwarding.
  • the source network device 232 sends 334 a handover cancel message to the second target network device 236 .
  • the terminal device 210 can successfully handover from the source cell 222 to the first target cell 224 .
  • This process realizes the enhancement of cell handover, and realizes an interruption delay of 0 milliseconds (or close to 0 milliseconds) during the handover process.
  • the source network device 232 sends the PDCP SDUs associated with the PDCP SN to the first target network device 234, so that the first target network device 234 also performs header compression, encryption, etc. on these PDCP SDUs deal with.
  • the data transmission between the source network device 232 and the terminal device 210 is not interrupted, and both the first target network device 234 and the source network device 232 will send downlink data to the terminal device 210, thereby The interruption time of data transmission is shortened.
  • the terminal device 210 has two sets of protocol stacks, called DAPS, corresponding to the source network device 232 and the first target network device 234 respectively data communication.
  • DAPS Data Radio Bearer
  • some data radio bearers can support DAPS, and other DRBs do not need to perform DAPS processing, which can improve resource utilization.
  • the mobility management of the terminal equipment 101 in the RRC connected state is controlled by the network equipment 102 of the source cell.
  • the network device 102 of the source cell sends a handover message to the terminal device 101 to instruct the terminal device 101 which target cell to switch to and how to perform the handover, and then the terminal device 101 can proceed based on the content contained in the received handover message. into the target area.
  • the successful sending of the handover message is a necessary condition to ensure the successful handover under the handover mechanism.
  • the network device 102 of the source cell generally determines whether to instruct the terminal device 101 to perform handover based on the signal quality reported by the terminal device 101, for example, the terminal device 101 detects that a neighboring cell When the signal quality of the signal quality of the current serving cell is better than a certain threshold, the terminal device 101 reports the measurement result.
  • the rapid attenuation of signal quality, the rapid movement of terminal equipment, the occlusion of objects, the long duration of handover preparation, etc. may cause the failure of sending measurement reports, which in turn may lead to handover failure, reducing switching success rate.
  • the handover process 300 shown in FIG. It is insensitive to the source network device 232 . In this way, the change of the environment where the terminal device 210 is located can be fully considered, and the handover is triggered by the terminal device 210, thereby improving the handover success rate.
  • the handover process 300 shown in FIG. 3 has a composite handover type of DAPS+CHO, and the handover process can be triggered by the terminal device 210 and the handover process realizes the minimum interruption delay, thus ensuring the handover efficiency.
  • handover failure may occur.
  • the solution for handling handover failure in the embodiment of the present disclosure will be described below with reference to FIG. 4 to FIG. 5 .
  • Fig. 4 shows a schematic flowchart of a process 400 for a terminal device to perform cell handover according to some embodiments of the present disclosure.
  • the process 400 may be performed by the terminal device 210 .
  • the terminal device 210 performs a handover procedure from the source cell 222 to the first target cell 224, wherein the first target cell 224 belongs to the set of candidate cells.
  • a handover procedure to the first target cell 224 may be performed with reference to 322 to 326 as shown in FIG. 3 .
  • the embodiments of the present disclosure are not limited thereto, for example, other handover types or procedures may also be used to perform handover from the source cell 222 to the first target cell 224 .
  • the terminal device 210 may receive a first handover configuration message, such as an RRC reconfiguration message, from the source network device 232 .
  • the first handover configuration message may include a trigger condition and handover configuration information of each candidate cell in the candidate cell set.
  • the first handover configuration message may further include fallback indication information, which is used to indicate whether the terminal device 210 falls back to the source cell when a handover fails.
  • the first handover configuration message may further include a first preset time period or a times threshold.
  • the first preset time period or the number of times threshold may be used to indicate the opportunity for the terminal device 210 to perform rollback. Specifically, if the first preset time period is exceeded or the number of occurrences of a specific event reaches the number of times threshold, no more rollback will be performed. retreat.
  • a first timer may be used to determine whether the first preset time period is reached, wherein the start (or reset) moment of the first timer may be any of the following: when the first handover configuration message is received , when the handover process is started, or when a handover failure occurs.
  • a counter can be used to determine whether the number of times threshold is reached, wherein the start (or reset) moment of the number of times threshold can be any of the following: when a handover failure occurs, when a rollback occurs, when a rollback is successful, or when a trigger Wait while switching.
  • the first handover configuration message may further include a second preset time period.
  • the second preset time period may be used to indicate the opportunity for the terminal device 210 to perform cell selection. Specifically, if no suitable cell is found beyond the second preset time period, the cell selection is stopped and enters an idle state.
  • a second timer may be used to determine whether the second preset time period is reached, wherein the starting moment of the second timer may be any of the following: when the first handover configuration message is received, the handover process is started When, when a switchover fails, when a fallback fails, etc.
  • the first handover configuration message may further include first indication information, which is used to indicate whether the terminal device 210 sends the first message to the source network device 232 when a handover failure occurs.
  • the first handover configuration message may also include an identifier of another cell, which is used to instruct the terminal device 210 to send a second message to the network device of the other cell after successfully selecting the target cell, as described in conjunction with 538 below .
  • the terminal device 210 may determine that the candidate cell satisfying the trigger condition is the first target cell 224 based on the first handover configuration message. The terminal device 210 may then perform a handover procedure based on the handover configuration information of the first target cell 224 .
  • the terminal device 210 determines that a handover failure occurs during the handover process.
  • Handover failure may occur based on various reasons, for example, the timing of handover is too early, the timing of handover is too late, or a wrong cell is selected.
  • Too early handover can also be called too early handover (Too Early Handover).
  • the terminal device has a wireless link with the target cell within a short time (such as a preset time period) after it is successfully handed over from the source cell to the target cell. Failure (Radio Link Failure, RLF), or the handover failure of the terminal device during the handover process, which may be because the terminal device performs the handover process too early, resulting in poor connection quality between the terminal device and the network device of the target cell, prone to RLF.
  • RLF Radio Link Failure
  • Too late handover can also be called too late handover (Too Late Handover).
  • RLF occurs after the terminal device stays in the source cell for a long time, but the handover has not started at this time. This may be because the terminal device performs the handover The process is too late.
  • the terminal device 210 may select a cell (assumed to be cell A) as the target cell, but the actual situation may be that cell B is more suitable, which may RLF will occur soon after the terminal device is handed over from the source cell to cell A, or the terminal device may fail to handover during the handover process, because the link quality between the network device in cell A and the terminal device is relatively poor.
  • the terminal device 210 may also determine whether to send the first message to the source network device 232 based on the first indication information, where the first indication information is used to indicate whether to send the first message to the source network device when a handover failure occurs. a message. Further, if the first indication information indicates to send the first message to the source network device when a handover failure occurs, the terminal device 210 may send the first message to the source network device 232 .
  • the first message refer to the detailed description below in conjunction with 529 in FIG. 5 , and for the sake of brevity, details are not described here.
  • the terminal device 210 determines fallback indication information, where the fallback indication information at least indicates whether to fall back to the source cell when the handover fails.
  • the terminal device 210 may determine pre-stored rollback indication information, for example, obtain the rollback indication information locally from the terminal device 210 .
  • the fallback indication information may be sent by the source network device 232 to the terminal device 210 .
  • the source network device 232 may send the fallback instruction information to the terminal device 210 via an RRC reconfiguration message (such as 316 in FIG. 3 ), that is, the RRC reconfiguration message includes the fallback instruction information.
  • the source network device 232 may send the fallback indication information to the first target network device 234, such as sending via the first handover request message at 3102 or via other signaling at other times, the first target The network device 234 may include the fallback instruction information in the first handover request confirmation message, and send it to the source network device 232 at 3142, so that the source network device 232 may send the RRC reconfiguration message including the fallback instruction information at 316 to the terminal device 210.
  • FIG. 3 an RRC reconfiguration message
  • the source network device 232 may add the fallback instruction information to it, and include the fallback instruction at 316.
  • An informational RRC reconfiguration message is sent to the terminal device 210 .
  • the source network device 232 may send the fallback indication information to the terminal device 210 via another message different from the RRC reconfiguration message (such as 316 in FIG. 3 ). Referring to FIG. 3 , for example, the source network device 232 may send the fallback indication information to the terminal device 210 before 316 or after 316 . In some examples, the source network device 232 may send the fallback indication information to the terminal device 210 in other ways. For example, the source network device 232 may send the fallback indication information through a system message (such as MIB, SIB1, etc.), an RRC configuration message, etc., which is not limited in the present disclosure. It can be understood that the embodiments of the present disclosure do not limit the signaling carrying the fallback indication information, for example, it may be RRC layer signaling, medium access control (Medium Access Control, MAC) signaling, or physical layer signaling.
  • RRC layer signaling such as MIB, SIB1, etc.
  • MAC Medium Access Control
  • the fallback indication information may be pre-configured, for example, pre-defined by a protocol, which can save signaling overhead.
  • the terminal device 210 performs a fallback operation to the source cell 222 .
  • performing the fallback operation by the terminal device may mean that the terminal device 210 falls back to (falls back to) the configuration of the source cell and restores the connection with the source cell 222.
  • Fig. 5 shows a schematic flowchart of a process 500 performed by a terminal device after a handover failure occurs according to some embodiments of the present disclosure.
  • the terminal device 210 determines whether the fallback indication information indicates fallback to the source cell when the handover fails. If yes, go to step 520 . If not, go to step 530 .
  • the terminal device 210 determines whether a fallback condition is met. If yes, go to 522. If not, go to step 530 .
  • the fallback condition may include that the elapsed time is lower than a first preset time period or the number of occurrences of a specific event is lower than a threshold value.
  • the elapsed time being lower than the first preset time period may include any of the following: the elapsed time since receiving the first handover configuration message is lower than the first preset time period, the elapsed time since the start of the handover process The time is lower than the first preset time period, or the 20 cases elapsed since the switching failure occurs are lower than the first preset time period.
  • the first timer can be used to determine whether the first preset time period is reached, wherein the start time of the first timer can be any of the following: when the first handover configuration message is received, the handover process is started , when switching failure occurs, etc.
  • the number of occurrences of a specific event is lower than the number threshold may include any of the following: the number of handover failures is lower than the number threshold, the number of rollbacks is lower than the number threshold, the number of rollback successes is lower than the number threshold, or The number of trigger switching is lower than the number threshold.
  • a counter can be used to determine whether the number of times threshold is reached, wherein the start (or reset) moment of the number of times threshold can be any of the following: when a handover failure occurs, when a rollback occurs, when a rollback is successful, or when a trigger Wait while switching.
  • the first preset time period and/or the number of thresholds may be predetermined or pre-configured by the protocol, or may be configured by the source network device 232 through high-layer signaling, or may be sent by the source network device 232 through an RRC reconfiguration message to The terminal device 210, or may be sent to the terminal device 210 by the source network device 232 through other signaling, which is not limited in this embodiment of the present disclosure.
  • the first preset time period and/or the times threshold may be included in the rollback indication information. In some embodiments, the first preset time period and/or the times threshold may be included in another signaling independently of the backoff indication information.
  • the terminal device 210 performs a fallback operation. That is, the terminal device 210 falls back to the source cell configuration.
  • FIG. 5 shows that 520 is performed first and then 522 is performed after the "yes" branch of 520 is determined, the present disclosure is not limited thereto. As another example, 522 may be executed first and then 520 may be executed, and 524 may be executed after the "yes" branch is determined at 520 . No longer listed here.
  • the terminal device 210 determines whether the rollback is successful. If yes, go to 526. If not, go to step 530 .
  • the rollback success may refer to that the terminal device 210 successfully rolls back to the configuration of the source cell and resumes the connection with the source cell (resume the connection with source cell).
  • the terminal device 210 remains in the source cell. That is, the terminal device 210 continues to communicate with the source network device 232 .
  • the terminal device 210 may also re-execute the cell switching process.
  • the terminal device 210 may still perform cell handover based on the first handover configuration message. For example, re-execute 410 to 440 as shown in FIG. 4 .
  • the terminal device 210 may receive the second handover configuration message from the source network device 232, and perform cell handover based on the second handover configuration message, similar to 410 to 440 shown in FIG. 4 .
  • the second handover configuration message may include a new trigger condition and handover configuration information of each new candidate cell set in the new candidate cell set.
  • the new trigger condition in the second handover configuration message may be the same as or different from the trigger condition in the first handover configuration message.
  • the new set of candidate cells indicated in the second handover configuration message and the set of candidate cells indicated in the first handover configuration message may be completely different, partly the same or all the same. This disclosure is not limited thereto.
  • 528 may also be performed.
  • the terminal device 210 determines whether the first indication information indicates to send a first message to the source network device 232 when a handover failure occurs. If the first indication information indicates to send the first message to the source network device 232 when a handover failure occurs, go to step 529 .
  • the first indication information may be pre-specified or pre-configured by the protocol, or may be configured by the source network device 232 through high-level signaling, or may be sent by the source network device 232 to the terminal device 210 through an RRC reconfiguration message or may be sent by the source network device 232 to the terminal device 210 through other signaling, which is not limited in this embodiment of the present disclosure.
  • the fallback indication information and the first indication information may be included in the same signaling.
  • the first indication information may further indicate information included in the first message.
  • the terminal device 210 sends the first message to the source network device 232 .
  • the first message may be sent when it is determined that the link between the terminal device 210 and the source network device 232 is available.
  • the first message may be sent to the source network device 232 directly via the link between the terminal device 210 and the source network device 232 .
  • the first message may be sent to source network device 232 indirectly.
  • the terminal device 210 may send the first message to another network device, and the other network device forwards the first message to the source network device 232 .
  • the fallback operation performed by the terminal device 210 to the source cell 222 will cause the fallback to fail.
  • a first message is sent to source network device 232 .
  • the first message may indicate one or more of the following: a first preset time period or times threshold, handover type, number of handover failures, time when handover failures occur, time from initiation of handover process to occurrence of handover failures
  • the first time length between, the first measurement information for the first target cell when the handover failure occurs, the second measurement information for the source cell when the handover failure occurs, and the other candidate cells in the candidate cell set when the handover failure occurs The third measurement information, whether to perform fallback, the number of successful fallbacks, the time when the fallback is successful, the fourth measurement information for the first target cell when the fallback is successful, and the fifth measurement information for the source cell when the fallback is successful , the sixth measurement information for other candidate cells when the fallback is successful, the second time period from the handover failure to the fallback success, whether the fallback fails, the time when the fallback fails, and the first target when the fallback fails
  • the switching type may be DAPS+CHO.
  • Other candidate cells may refer to other candidate cells in the candidate cell set except the first target cell.
  • the terminal device 210 may perform cell handover again after the fallback is successful, and handover failure may also occur again.
  • the number of handover failure occurrences may refer to the number of handover failure occurrences after the first handover configuration message is received.
  • the time when the handover failure occurs may include: the time when the handover failure occurs for the first time, the time when the handover failure occurs for the last time (the time closest to the present), or the time when each handover failure occurs.
  • the first duration indicated by the first message may include: a duration from when a handover process is initiated based on the first handover configuration message to when a handover failure occurs any time (or every time or the last time).
  • the first period of time between the initiation of the handover process and the occurrence of the handover failure may be expressed as: the time period between the initiation of the handover process and the first occurrence of the handover failure, and/or, the period between two adjacent handover failures the duration of waiting.
  • the first measurement information, the second measurement information and the third measurement information may respectively include the measurement results when handover failure occurs each time, or may include the measurement results when handover failure occurs last time.
  • the number of successful rollbacks indicated by the first message may refer to the number of successful rollbacks within the first preset time period, or may refer to the number of successful rollbacks after receiving the first handover configuration message .
  • the time when rollback is successful may include: the time when rollback is successful for the first time, the time when rollback is successful for the last time (closest to the current one), or the time when rollback is successful every time.
  • the fourth measurement information, the fifth measurement information, and the sixth measurement information may respectively include the measurement result of each successful rollback, or may include the measurement result of the last successful rollback.
  • the second duration may include: the duration from the first handover failure to the first rollback success, the time from the first handover failure to the last rollback success, and the time period from the last rollback The time period between the handover failure and the last rollback success, or the time period between each handover failure and the nearest subsequent rollback success, etc.
  • the second duration may further indicate the duration between two adjacent rollback successes.
  • the third duration may include: the duration from the first occurrence of the handover failure to the rollback failure, or the duration from the last occurrence of the handover failure to the rollback failure, and the like.
  • the first message may also indicate the number of times the handover is triggered, the time when the handover is triggered, and the like.
  • the first message may also indicate the measurement information of at least one neighbor cell of the source cell when the fallback is successful (for example, the last time or every time), and/or, the measurement information of the source cell when the fallback fails Measurement information of at least one neighboring cell of .
  • the first message may also indicate the measurement information of the cell indicated for the source cell when the fallback is successful (such as the last time or every time), and/or, the measurement information for the source cell when the fallback fails Measurement information of the indicated cell.
  • the source network device 232 may notify the terminal device 210 of the indicated cell identifier through signaling in advance, and the signaling may be an RRC reconfiguration message or other messages, which is not limited in the present disclosure. Then, the terminal device 210 may measure the indicated cell to obtain measurement information based on the identifier of the indicated cell, and indicate the measurement information of the indicated cell through the first message.
  • the measurement information in the embodiments of the present disclosure may be a measurement result obtained by measuring a measurement object, where the measurement object may be a synchronization signal or a reference signal, for example, including one or more of the following: Channel State Information Reference Signal (Channel State Information -Reference Signal, CSI-RS), synchronization signal and physical broadcast channel block (Synchronization Signal and Physical Broadcast Channel Block, SSB), etc.
  • CSI-RS Channel State Information Reference Signal
  • SSB Synchrom Broadcast Channel Block
  • the measurement results can be beam-level or cell-level measurement results, for example, including one or more of the following: Reference Signal Received Power (Reference Signal Received Power, RSRP), Reference Signal Received Quality (Reference Signal Received Quality, RSRQ), signal Signal to Interference plus Noise Ratio (SINR), Received Signal Strength Indication (RSSI), etc.
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • SINR Signal to Interference plus Noise Ratio
  • RSSI Received Signal Strength Indication
  • the first message may be carried in a handover failure (HO failure) report, or the first message may be another message independent of the handover failure report, which is not limited in the present disclosure.
  • HO failure handover failure
  • the terminal device 210 performs cell selection. Specifically, this process may also be called cell reselection, and the terminal device 210 may determine whether there is a cell satisfying the trigger condition.
  • the terminal device 210 determines whether a suitable cell cannot be found within a second preset time period.
  • the second preset time period may be received from the source network device 232 .
  • the second preset time period may be included in the first handover configuration message to indicate the timing of cell selection.
  • the second preset time period may be included in other signaling or messages.
  • the second preset time period may be predefined by a protocol, or may be preconfigured, which is not limited in the present disclosure.
  • the terminal device 210 may use the second timer to determine whether the second preset time period is reached, where the start time of the second timer may be any of the following: when receiving the first handover configuration message, starting When performing the switchover process, when a switchover fails, or when a rollback fails, etc.
  • the terminal device 210 enters an idle state. Specifically, if the terminal device 210 cannot find a suitable cell within the second preset time period, it enters an idle state to avoid cell selection for a long time, which can save energy consumption of the terminal device 210 .
  • the terminal device 210 determines whether the selected cell is a candidate cell.
  • the source network device 232 has sent the handover configuration information of each candidate cell in the candidate cell set to the terminal device 210 .
  • the new cell is the second target cell 226, which belongs to the candidate cell set, then 535 is executed. On the contrary, assuming that the new cell is the third target cell, which does not belong to the set of candidate cells, go to 534 .
  • the terminal device 210 performs RRC re-establishment. And then 535 can be executed.
  • 534 may be executed after the "no" branch is determined at 531, and then 535 may be executed. That is to say, 533 may not be executed.
  • the terminal device 210 performs a cell handover. Specifically, the terminal device 210 switches from the source cell to a new cell, such as the second target cell 226 or the third target cell.
  • the terminal device 210 determines whether the handover failed. If it is determined that the handover fails, return to execution 510 . If it is determined that the handover is successful, go to step 537.
  • the terminal device 210 camps on the new cell. Specifically, referring to FIG. 3 , after the handover is successful, an RRC reconfiguration complete message may be sent to the network device of the new cell (such as the second target network device 236 or the network device of the third target cell). Optionally, it can also be detached from the source cell (detach from the source cell).
  • 538 may also be performed.
  • the terminal device 210 sends the second message.
  • end device 210 may send the second message to source network device 232 .
  • the terminal device 210 may send the second message to the source network device 232 before detaching from the source cell.
  • the terminal device 210 may send the second message to another network device, and the other network device forwards the second message to the source network device 232 .
  • another network device may be a network device of the new cell, that is, the terminal device 210 may directly or indirectly send the second message to the network device of the new cell, so that the network device of the new cell may send the second message to the network device of the new cell.
  • the second message is forwarded to source network device 232 directly or indirectly.
  • the terminal device 210 may send the second message to the second target network device 236 .
  • the second message may be included in the RRC reconfiguration complete message sent by the terminal device 210 to the network device of the new cell.
  • the second destination network device 236 may forward the second message to the source network device 232 .
  • the second target network device 236 may combine the second message and the handover completion message into one message and send it to the source network device 232 .
  • the other network device may be indicated by the first handover configuration message sent by source network device 232 .
  • the first handover configuration message may include identities of other cells. Therefore, the terminal device 210 can determine the network device of the other cell based on the identifier of the other cell, and the terminal device 210 can directly or indirectly send the second message to the network device of the other cell indicated by the identifier, so that the network device of the other cell The device may forward the second message to source network device 232 directly or indirectly.
  • the second message may indicate one or more of the following: first preset time period or times threshold, handover type, number of times handover failure occurs, time when handover failure occurs, time from initiation of handover process to occurrence of handover failure
  • the switching type may be DAPS+CHO.
  • Other candidate cells may refer to other candidate cells in the candidate cell set except the first target cell.
  • the terminal device 210 may perform cell handover again after the fallback is successful, and handover failure may also occur again.
  • the number of handover failure occurrences may refer to the number of handover failure occurrences after the first handover configuration message is received.
  • the time when the handover failure occurs may include: the time when the handover failure occurs for the first time, the time when the handover failure occurs for the last time (the time closest to the present), or the time when each handover failure occurs.
  • the first duration may include: a duration from when a handover process is initiated based on the first handover configuration message to when a handover failure occurs any time (or every time or the last time).
  • the first period of time between the initiation of the handover process and the occurrence of the handover failure may be expressed as: the time period between the initiation of the handover process and the first occurrence of the handover failure, and/or, the period between two adjacent handover failures the duration of waiting.
  • the first measurement information, the second measurement information and the third measurement information may respectively include the measurement results when handover failure occurs each time, or may include the measurement results when handover failure occurs last time.
  • the number of successful rollbacks may refer to the number of successful rollbacks within the first preset time period, or may refer to the number of successful rollbacks after receiving the first handover configuration message.
  • the time when rollback is successful may include: the time when rollback is successful for the first time, the time when rollback is successful for the last time (the closest to the current one), or the time when rollback is successful every time.
  • the fourth measurement information, the fifth measurement information, and the sixth measurement information may respectively include the measurement result of each successful rollback, or may include the measurement result of the last successful rollback.
  • the second duration may include: the duration from the first handover failure to the first rollback success, the time from the first handover failure to the last rollback success, and the time period from the last rollback The time period between the handover failure and the last rollback success, or the time period between each handover failure and the nearest subsequent rollback success, etc.
  • the second duration may further indicate the duration between two adjacent rollback successes.
  • the third duration may include: the duration from the first occurrence of the handover failure to the rollback failure, or the duration from the last occurrence of the handover failure to the rollback failure, and the like.
  • the fifth duration may include: the duration from the first occurrence of handover failure to the successful selection of the second target cell, the duration from the last occurrence of handover failure to the successful selection of the second target cell, each occurrence of The time period between the handover failure and the successful selection of the second target cell, etc.
  • the fifth duration may also be expressed as a duration from when a handover failure occurs to when a suitable cell is selected.
  • the fifth duration may be indicated indirectly, for example, the fifth duration may be indicated by the sum of the third duration and the fourth duration.
  • the second message may also indicate the number of times the handover is triggered, the time when the handover is triggered, and the like.
  • the second message may also indicate the measurement information of at least one neighbor cell of the source cell when the fallback is successful (such as the last time or every time), and/or, the source cell when the fallback fails Measurement information of at least one neighboring cell of .
  • the second message may also indicate the measurement information of the cell indicated for the source cell when the fallback is successful (such as the last time or every time), and/or, the measurement information for the source cell when the fallback fails Measurement information of the indicated cell.
  • the source network device 232 may notify the terminal device 210 of the indicated cell identifier through signaling in advance, and the signaling may be an RRC reconfiguration message or other messages, which is not limited in the present disclosure. Then, the terminal device 210 may measure the indicated cell to obtain measurement information based on the identifier of the indicated cell, and indicate the measurement information of the indicated cell through the second message.
  • the measurement information may be a measurement result obtained by measuring a measurement object, where the measurement object may be a synchronization signal or a reference signal, for example, including one or more of the following: CSI-RS, SSB, and the like.
  • the measurement results may be beam-level or cell-level measurement results, for example, including one or more of the following: RSRP, RSRQ, SINR, RSSI and so on.
  • the handover type indicated by the first message or the second message may be a hybrid handover type, or may also be called DAPS+CHO.
  • the handover type may be handover based on fallback indication information.
  • the handover type may be DAPS handover, or the handover type may be CHO, or the handover type may be other types, which will not be listed here.
  • the terminal device when a handover failure occurs, the terminal device can determine whether to fall back to the source cell or re-perform cell selection based on the fallback indication information, so that the processing flow of the terminal device can be clarified, and the efficiency of the handover can be ensured.
  • Fig. 6 shows a schematic flowchart of a process 600 for cell handover according to some embodiments of the present disclosure.
  • the process 600 may be executed by a network device, such as the network device 232 shown in FIG. 2 .
  • the network device 232 sends fallback instruction information to the terminal device 210, the fallback instruction information at least indicates whether to fall back to the source cell 222 when the handover fails, and the network device 232 is the source cell 222 when the terminal device 210 performs the handover process The network equipment of the community.
  • the fallback indication information may be included in the RRC reconfiguration message, or the fallback indication information may be included in other messages.
  • the embodiments of the present disclosure do not limit the sending timing of the fallback indication information, for example, it may be indicated in the system information, it may be indicated in the RRC signaling, it may be indicated in the random access response, or it may be indicated in the handover configuration message, etc. wait.
  • the network device 232 may also send a first handover configuration message to the terminal device 210, and the first handover configuration message may include a trigger condition and handover configuration information of each candidate cell in the candidate cell set, wherein the trigger condition At least for the terminal equipment to determine the first target cell.
  • the first handover configuration message may be implemented as an RRC reconfiguration message.
  • the network device 232 executes the communication with the terminal device 210 based on the fallback operation of the terminal device 210. The operation of the connection.
  • the fallback indication information indicates fallback to the source cell when the handover fails, in conjunction with FIG. 2 , if the handover failure occurs in the handover process of the terminal device 210 from the cell 222 to the cell 224, then the terminal device 210 performs a fallback to the cell 222 operation, then the network device 232 can restore the connection with the terminal device 210 .
  • the network device 232 receives a handover report message from the terminal device 210 .
  • the handover report message may indicate at least one of the following: a first preset time period or a number of thresholds; the handover type of the handover process; the number of handover failures; the time when the handover failure occurs; The first duration of the handover; when the handover fails, the first measurement information for the first target cell to which the handover process is handed over; when the handover fails, the second measurement information for the source cell; when the handover fails, for the set of candidate cells
  • the third measurement information of the other candidate cells in the cell whether to perform rollback; the number of successful rollbacks; the time when the rollback is successful; the fourth measurement information for the first target cell when the rollback is successful;
  • the seventh measurement information may indicate
  • the handover report message may be the first message or the second message in the foregoing embodiments, and the handover report message may be implemented as a handover failure report or a handover success report, which is not limited in the present disclosure.
  • the network device 232 may further adjust or update the handover configuration based on the first message, for example, may determine the second handover configuration message. For example, if the terminal device 210 rolls back successfully, the network device 232 may also send a second handover configuration message to the terminal device 210 that rolls back successfully, so that the terminal device 210 can re-execute the handover process based on the second handover configuration message, so that The success rate of switching can be improved. For example, if the terminal device 210 fails to fall back, the network device 232 may send a second handover configuration message to other terminal devices to be handed over, which can reduce handover failures of other terminal devices to be handed over during the cell handover process. The probability.
  • Embodiments of the present disclosure do not limit the specific manner in which the network device 232 adjusts or updates the switching configuration. For example, if the third duration indicated in the message is shorter (lower than the preset first duration threshold, such as 2 seconds or other values), then the network device 232 may determine that the terminal device 210 is connected to the source cell during handover. The link quality is too bad, or it can be determined that the link quality between the terminal device 210 and the target cell is relatively good during handover. Optionally, the network device 232 may determine that the terminal device 210 is not suitable to fall back to the source cell, or the network device 232 may determine that the terminal device 210 selected a wrong target cell last time.
  • the preset first duration threshold such as 2 seconds or other values
  • the network device 232 may send new fallback indication information to the terminal device 210, instructing the terminal device 210 not to fall back when the handover fails.
  • the network device 232 may send the second handover configuration information to the terminal device 210, which indicates other candidate cell sets. For example, if the third duration indicated by the message is longer (exceeds the preset second duration threshold, such as 5 seconds or other values), then the network device 232 may determine that the last handover failure may be caused by unreasonable handover configuration premature switching.
  • the network device can adjust the mobility parameters based on the indications of various information in the handover process reported by the terminal device, which can improve the handover success rate of the terminal device and reduce the handover failure rate. occur.
  • Fig. 7 shows a schematic block diagram of a communication device 700 for cell handover according to some embodiments of the present disclosure.
  • the apparatus 700 may be implemented as the terminal device 210 or as a part of the terminal device 210 (such as a chip), etc., which is not limited in the present disclosure.
  • the apparatus 700 may include a switching module 710 , a first determining module 720 , a second determining module 730 and a fallback module 740 .
  • the apparatus 700 may further include a cell selection module 750 , a re-establishment module 760 , a conversion module 770 and a sending module 780 .
  • the handover module 710 is configured to perform a handover procedure from a source cell to a first target cell, the first target cell belonging to the set of candidate cells.
  • the first determination module 720 is configured to determine that a handover failure occurs during the handover process.
  • the second determination module 730 is configured to determine fallback indication information, where the fallback indication information at least indicates whether to fall back to the source cell when the handover fails.
  • the fallback module 740 is configured to perform a fallback operation to the source cell when the fallback indication information indicates to fallback to the source cell when the handover fails.
  • the cell selection module 750 may be configured to execute the cell selection process when the elapsed time from initiating the handover process reaches a first preset time period or when the number of handover failures reaches a number threshold.
  • the cell selection module 750 may be configured to execute a cell selection process on the terminal device when the elapsed time reaches a first preset time period or the number of occurrences of a specific event reaches a number threshold, wherein the first preset time period starts from The starting moment may be when the first handover configuration message is received, when the handover process is started, or when handover failure occurs; where the specific event may be when handover failure occurs, when rollback occurs, when rollback succeeds, or when handover is triggered.
  • the cell selection module 750 may be configured to execute a cell selection process when it is determined that the rollback operation fails. Or as an example, the cell selection module 750 may be configured to perform a cell selection process when the fallback indication information indicates not to fallback to the source cell when the handover fails.
  • the sending module 780 may be configured to send a first message to the network device of the source cell, and the first message indicates at least one of the following: a first preset time period or a threshold of times; a handover type of the handover process; occurrence The number of handover failures; the time when handover failure occurs; the first time period from the initiation of the handover process to the occurrence of handover failure; the first measurement information for the first target cell when handover failure occurs; The second measurement information of the cell; the third measurement information for other candidate cells in the candidate cell set when handover failure occurs; whether to perform rollback; the number of successful rollbacks; the time when the rollback is successful; each time the rollback is successful.
  • the handover module 710 may also be configured to perform a handover process to the second target cell when the second target cell in the candidate cell set is selected by the cell selection process.
  • the re-establishment module 760 may be configured to perform an RRC re-establishment process with the second target cell when the cell selection process selects a second target cell that does not belong to the candidate cell set.
  • the re-establishment module 760 may be configured to perform an RRC re-establishment process with the second target cell when the second target cell is selected by the cell selection process.
  • the switching module 770 may be configured to switch to an idle state when no suitable cell can be found within a second preset time period.
  • the sending module 780 may be configured to send the second message when the second target cell is selected in the cell selection process and the handover to the second target cell is successful.
  • the second message indicates at least one of the following: a first preset time period or a threshold value of times; the handover type of the handover process; the number of times handover failures occur; the time when handover failures occur; The first duration; the first measurement information for the first target cell when handover failure occurs; the second measurement information for the source cell when handover failure occurs; the second measurement information for other candidate cells in the candidate cell set when handover failure occurs 3.
  • Measurement information whether to perform rollback; the number of successful rollbacks; the time when the rollback is successful; the fourth measurement information for the first target cell when the rollback is successful; the fifth measurement information for the source cell when the rollback is successful; The sixth measurement information for other candidate cells in the candidate cell set when the rollback is successful; the second time period from the occurrence of handover failure to the rollback success; whether the rollback fails; the time when the rollback fails; when the rollback fails The seventh measurement information for the first target cell; the eighth measurement information for the source cell when the fallback fails; the ninth measurement information for other candidate cells in the candidate cell set when the fallback fails; from handover failure to fallback The third time period between failures; the fourth time period between rollback failure and successful selection of the second target cell; or the fifth time period between handover failure and successful selection of the second target cell.
  • each function in the disclosed embodiments Units can be integrated into one unit, or physically exist separately, or two or more units can be integrated into one unit.
  • the above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.
  • the apparatus 700 in FIG. 7 can be used to implement each process described by the terminal device 210 in the foregoing embodiment, and for the sake of brevity, details are not repeated here.
  • Fig. 8 shows a schematic block diagram of a communication device 800 for cell handover according to some embodiments of the present disclosure.
  • the apparatus 800 may be implemented as the network device 232 or as a part of the network device 232 (such as a chip), etc., which is not limited in the present disclosure.
  • the device 800 includes a sending module 810 , a connecting module 820 and a receiving module 830 .
  • the sending module 810 is configured to send fallback instruction information to the terminal device, the fallback instruction information at least indicates whether to fall back to the source cell when the handover fails, and the communication device 800 is the network device of the source cell when the terminal device performs the handover process.
  • the connection module 820 is configured to perform an operation of connecting with the terminal device based on the fallback operation of the terminal device when the terminal device fails to handover during the handover process and the fallback indication information indicates that the terminal device falls back to the source cell when the handover fails.
  • the sending module 810 may also be configured to send a handover configuration message to the terminal device, where the handover configuration message may include a trigger condition and handover configuration information of each candidate cell in the candidate cell set, where the trigger condition is at least for the terminal device Determine the first target cell.
  • the handover configuration message may include a trigger condition and handover configuration information of each candidate cell in the candidate cell set, where the trigger condition is at least for the terminal device Determine the first target cell.
  • the receiving module 830 may be configured to receive a handover report message from the terminal device, the handover report message indicating at least one of the following: a first preset time period or a threshold of times; a handover type of the handover process; handover occurs The number of times of failure; the time when the handover failure occurs; the first duration from the initiation of the handover process to the occurrence of the handover failure; the first measurement information for the first target cell to which the handover process is handed over when the handover failure occurs; The second measurement information for the source cell when the handover fails; the third measurement information for other candidate cells in the candidate cell set when the handover fails; whether to perform rollback; the number of successful rollbacks; the time when the rollback is successful; The fourth measurement information for the first target cell when the rollback is successful; the fifth measurement information for the source cell when the rollback is successful; the sixth measurement information for other candidate cells when the rollback is successful; from handover failure to rollback success The second duration between; whether the rollback fails; the time when the handover failure
  • each function in the disclosed embodiments Units can be integrated into one unit, or physically exist separately, or two or more units can be integrated into one unit.
  • the above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.
  • the apparatus 800 in FIG. 8 can be used to implement various processes described by the network device 232 in the foregoing embodiments, and details are not described here for brevity.
  • FIG. 9 shows a schematic block diagram of an example device 900 that may be used to implement embodiments of the present disclosure.
  • Device 900 may be implemented as or included in terminal device 210 of FIG. 2 , or device 900 may be implemented as or included in network device 232 of FIG. 2 .
  • device 900 includes one or more processors 910 , one or more memories 920 coupled to processors 910 , and a communication module 940 coupled to processors 910 .
  • the communication module 940 can be used for two-way communication.
  • the communication module 940 may have at least one communication interface for communication.
  • Communication interfaces may include any interface necessary to communicate with other devices.
  • the processor 910 may be of any type suitable for the local technical network, and may include, but is not limited to, at least one of the following: a general-purpose computer, a special-purpose computer, a microcontroller, a digital signal processor (Digital Signal Processor, DSP), or a control-based One or more of the multi-core controller architectures of the processor.
  • Device 900 may have multiple processors, such as application specific integrated circuit chips, that are time slaved to a clock that is synchronized to a main processor.
  • Memory 920 may include one or more non-volatile memories and one or more volatile memories.
  • non-volatile memory include but are not limited to at least one of the following: read-only memory (Read-Only Memory, ROM) 924, erasable programmable read-only memory (Erasable Programmable Read Only Memory, EPROM), flash memory, hard disk , Compact Disc (CD), Digital Video Disk (Digital Versatile Disc, DVD) or other magnetic and/or optical storage.
  • Examples of volatile memory include, but are not limited to, at least one of: Random Access Memory (RAM) 922, or other volatile memory that does not persist for the duration of a power outage.
  • RAM Random Access Memory
  • the computer program 930 comprises computer-executable instructions executed by the associated processor 910 .
  • Program 930 can be stored in ROM 924.
  • Processor 910 may perform any suitable actions and processes by loading program 930 into RAM 922.
  • Embodiments of the present disclosure may be implemented by means of a program 930 such that the device 900 may perform any of the processes as discussed with reference to FIGS. 4 to 6 .
  • Embodiments of the present disclosure can also be realized by hardware or by a combination of software and hardware.
  • Program 930 may be tangibly embodied on a computer readable medium, which may be included in device 900 (such as in memory 920 ) or other storage device accessible by device 900 . Program 930 may be loaded from a computer readable medium into RAM 922 for execution.
  • the computer readable medium may include any type of tangible nonvolatile memory such as ROM, EPROM, flash memory, hard disk, CD, DVD, and the like.
  • the communication module 940 in the device 900 can be implemented as a transmitter and a receiver (or transceiver), which can be configured to send/receive information such as handover configuration messages, fallback indication information, first messages, Second message etc.
  • the device 900 may further include one or more of a scheduler, a controller, and a radio frequency/antenna, which will not be described in detail in this disclosure.
  • the device 900 in FIG. 9 may be implemented as a communication device, or may be implemented as a chip or chip system in the communication device, which is not limited by the embodiments of the present disclosure.
  • Embodiments of the present disclosure also provide a chip, which may include an input interface, an output interface, and a processing circuit.
  • a chip which may include an input interface, an output interface, and a processing circuit.
  • the interaction of signaling or data may be completed by the input interface and the output interface, and the generation and processing of signaling or data information may be completed by the processing circuit.
  • Embodiments of the present disclosure also provide a chip system, including a processor, configured to support a device to implement the functions involved in any of the foregoing embodiments.
  • the system-on-a-chip may further include a memory for storing necessary program instructions and data, and when the processor runs the program instructions, the device installed with the system-on-a-chip can implement the program described in any of the above-mentioned embodiments.
  • the chip system may consist of one or more chips, and may also include chips and other discrete devices.
  • Embodiments of the present disclosure further provide a processor, configured to be coupled with a memory, where instructions are stored in the memory, and when the processor executes the instructions, the processor executes the methods and functions involved in any of the foregoing embodiments.
  • Embodiments of the present disclosure also provide a computer program product containing instructions, which, when run on a computer, cause the computer to execute the methods and functions involved in any of the above embodiments.
  • Embodiments of the present disclosure also provide a computer-readable storage medium, on which computer instructions are stored, and when a processor executes the instructions, the processor is made to execute the methods and functions involved in any of the above embodiments.
  • the various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software, which may be executed by a controller, microprocessor or other device. While various aspects of the embodiments of the present disclosure are shown and described as block diagrams, flowcharts, or using some other pictorial representation, it should be understood that the blocks, devices, systems, techniques or methods described herein can be implemented as, without limitation, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controllers or other devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium.
  • the computer program product comprises computer-executable instructions, eg included in program modules, which are executed in a device on a real or virtual processor of a target to perform the process/method as above with reference to the accompanying drawings.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or divided as desired among the program modules.
  • Machine-executable instructions for program modules may be executed within local or distributed devices. In a distributed device, program modules may be located in both local and remote storage media.
  • Computer program codes for implementing the methods of the present disclosure may be written in one or more programming languages. These computer program codes can be provided to processors of general-purpose computers, special-purpose computers, or other programmable data processing devices, so that when the program codes are executed by the computer or other programmable data processing devices, The functions/operations specified in are implemented.
  • the program code may execute entirely on the computer, partly on the computer, as a stand-alone software package, partly on the computer and partly on a remote computer or entirely on the remote computer or server.
  • computer program code or related data may be carried by any suitable carrier to enable a device, apparatus or processor to perform the various processes and operations described above.
  • carriers include signals, computer readable media, and the like.
  • signals may include electrical, optical, radio, sound, or other forms of propagated signals, such as carrier waves, infrared signals, and the like.
  • a computer readable medium may be any tangible medium that contains or stores a program for or related to an instruction execution system, apparatus, or device.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. More detailed examples of computer-readable storage media include electrical connections with one or more wires, portable computer diskettes, hard disks, random storage access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash), optical storage, magnetic storage, or any suitable combination thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Embodiments of the present application relate to the field of communications, and provide a cell handover method and a communication apparatus. The cell handover method comprises: a terminal device performs a handover process from a source cell to a first target cell, the first target cell belonging to a set of candidate cells; the terminal device determines that a handover failure occurs during the handover process; the terminal device determines fallback indication information, the fallback indication information at least indicating whether to fall back to the source cell when handover fails; and when the fallback indication information indicates to fall back to the source cell when handover fails, the terminal device performs a fallback operation to the source cell. In the present embodiments, the fallback indication information is used to indicate whether the terminal device falls back to the source cell after handover failure occurs during the handover process, so that the terminal device may perform a fallback operation on the basis of the fallback indication information, thereby simplifying the operation of the terminal device, and improving handover efficiency.

Description

小区切换方法及通信装置Cell switching method and communication device
本申请要求于2021年9月15日提交中国专利局，申请号为202111082788.1，发明名称为“小区切换方法及通信装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application claims the priority of the Chinese patent application with the application number 202111082788.1 and the title of the invention "Cell Handover Method and Communication Device" submitted to the China Patent Office on September 15, 2021, the entire contents of which are incorporated by reference in this application.
技术领域technical field
本申请涉及通信领域，更具体地，涉及一种小区切换方法及通信装置。The present application relates to the communication field, and more specifically, to a cell handover method and a communication device.
背景技术Background technique
在移动通信***中，终端设备可能会因移动等因素而需要执行切换(handover)过程，从而从源小区切换到目标小区进行数据传输。In a mobile communication system, a terminal device may need to perform a handover process due to factors such as movement, so as to switch from a source cell to a target cell for data transmission.
在切换过程中，可能会发生切换失败的情形。目前终端设备在发生切换失败时，通过重新选择目标小区并重新执行小区切换过程，但是这样的过程效率不高。During the switching process, switching failure may occur. At present, when a handover failure occurs, a terminal device reselects a target cell and performs a cell handover process again, but such a process is not efficient.
发明内容Contents of the invention
本公开的实施例提供了一种小区切换方案。Embodiments of the present disclosure provide a cell switching solution.
第一方面，提供了一种小区切换方法。该方法包括：终端设备执行从源小区到第一目标小区的切换过程，第一目标小区属于候选小区集合；终端设备确定在切换过程中发生切换失败；终端设备确定回退指示信息，回退指示信息至少指示在切换失败时是否回退到源小区；以及当回退指示信息指示在切换失败时回退到源小区时，终端设备执行到源小区的回退操作。In a first aspect, a cell handover method is provided. The method includes: a terminal device performs a handover process from a source cell to a first target cell, and the first target cell belongs to a set of candidate cells; the terminal device determines that a handover failure occurs during the handover process; the terminal device determines rollback indication information, and the rollback indication The information at least indicates whether to fall back to the source cell when the handover fails; and when the fallback indication information indicates to fall back to the source cell when the handover fails, the terminal device performs a fallback operation to the source cell.
如此，本公开的实施例中通过回退指示信息指示终端设备在切换过程中发生切换失败后是否回退到源小区，从而终端设备能够基于该回退指示信息执行回退操作，从而简化了终端设备的操作，提升了切换的效率。In this way, in the embodiments of the present disclosure, the fallback indication information is used to indicate whether the terminal device falls back to the source cell after a handover failure occurs during the handover process, so that the terminal device can perform a fallback operation based on the fallback indication information, thereby simplifying the terminal The operation of the equipment improves the switching efficiency.
在第一方面的一些实施例中，还包括：当从发起切换过程开始经过的时间达到第一预设时间段时或者当发生切换失败的次数达到次数阈值时，终端设备执行小区选择过程。In some embodiments of the first aspect, the method further includes: when the elapsed time from initiating the handover process reaches a first preset time period or when the number of handover failures reaches a threshold, the terminal device executes the cell selection process.
在第一方面的一些实施例中，还包括：当经过的时间达到第一预设时间段或者发生特定事件的次数达到次数阈值时，终端设备执行小区选择过程；其中第一预设时间段的起始时刻可以是接收到第一切换配置消息时、开始执行切换过程时、或者发生切换失败时；其中特定事件可以是发生切换失败时、发生回退时、回退成功时、或者触发切换时。In some embodiments of the first aspect, it further includes: when the elapsed time reaches a first preset time period or the number of occurrences of a specific event reaches a number threshold, the terminal device performs a cell selection process; wherein the first preset time period The starting moment may be when the first handover configuration message is received, when the handover process is started, or when handover failure occurs; the specific event may be when handover failure occurs, when rollback occurs, when rollback is successful, or when handover is triggered .
如此，通过第一预设时间段或次数阈值来限定回退，避免发生无限次的回退导致的终端设备的复杂度，也避免终端设备的能耗过大。In this way, the fallback is limited by the first preset time period or the number of times threshold, so as to avoid the complexity of the terminal device caused by an infinite number of fallbacks, and also avoid excessive energy consumption of the terminal device.
在第一方面的一些实施例中，还包括：当确定回退操作失败时，终端设备执行小区选择过程。In some embodiments of the first aspect, the method further includes: when it is determined that the fallback operation fails, the terminal device performs a cell selection process.
如此，终端设备能够在回退操作失败后执行小区选择过程，从而避免终端设备因回退失败导致的传输中断，提升切换的效率。In this way, the terminal device can perform a cell selection process after the fallback operation fails, thereby avoiding transmission interruption caused by the fallback failure of the terminal device, and improving handover efficiency.
在第一方面的一些实施例中，还包括：当回退指示信息指示在切换失败时不回退到源小区时，终端设备执行小区选择过程。In some embodiments of the first aspect, the method further includes: when the fallback instruction information indicates not to fallback to the source cell when the handover fails, the terminal device performs a cell selection process.
如此，终端设备能够基于回退指示信息来执行小区选择过程，避免因切换失败导致的传输中断。通过小区选择过程能够尽快地找到更合适的小区，从而保证了切换效率。In this way, the terminal device can perform a cell selection process based on the fallback indication information, and avoid transmission interruption caused by handover failure. Through the cell selection process, a more suitable cell can be found as soon as possible, thereby ensuring switching efficiency.
在第一方面的一些实施例中，回退指示信息还指示以下至少一项：第一预设时间段或次数阈值。In some embodiments of the first aspect, the rollback indication information further indicates at least one of the following: a first preset time period or a times threshold.
在第一方面的一些实施例中，还包括：终端设备向源小区的网络设备发送第一消息，第一消息指示以下至少一项：第一预设时间段或次数阈值；切换过程的切换类型；发生切换失败的次数；发生切换失败时的时间；从发起切换过程到发生切换失败之间的第一时长；在发生切换失败时针对第一目标小区的第一测量信息；在发生切换失败时针对源小区的第二测量信息；在发生切换失败时针对候选小区集合中的其他候选小区的第三测量信息；是否执行回退；回退成功的次数；回退成功时的时间；回退成功时针对第一目标小区的第四测量信息；回退成功时针对源小区的第五测量信息；回退成功时针对其他候选小区的第六测量信息；从发生切换失败到回退成功之间的第二时长；是否回退失败；回退失败时的时间；回退失败时针对第一目标小区的第七测量信息；回退失败时针对源小区的第八测量信息；回退失败时针对候选小区集合中的其他候选小区的第九测量信息；或从发生切换失败到回退失败之间的第三时长。In some embodiments of the first aspect, it also includes: the terminal device sends a first message to the network device of the source cell, and the first message indicates at least one of the following: a first preset time period or a threshold value of times; a handover type of the handover process ; The number of handover failures; the time when handover failures occur; the first time period from initiating the handover process to the occurrence of handover failures; the first measurement information for the first target cell when handover failures occur; when handover failures occur The second measurement information for the source cell; the third measurement information for other candidate cells in the candidate cell set when handover failure occurs; whether to perform rollback; the number of successful rollbacks; the time when the rollback is successful; the rollback is successful The fourth measurement information for the first target cell when the fallback is successful; the fifth measurement information for the source cell when the fallback is successful; the sixth measurement information for other candidate cells when the fallback is successful; The second duration; whether the fallback fails; the time when the fallback fails; the seventh measurement information for the first target cell when the fallback fails; the eighth measurement information for the source cell when the fallback fails; the candidate for the fallback failure Ninth measurement information of other candidate cells in the cell set; or a third time period from occurrence of handover failure to fallback failure.
如此，在发生切换失败时，终端设备能够通过第一消息向源小区的网络设备报告切换失败的各方面信息，从而网络设备能够更全面地了解切换过程，便于对移动性管理进行进一步的优化。In this way, when a handover failure occurs, the terminal device can report all aspects of handover failure information to the network device of the source cell through the first message, so that the network device can understand the handover process more comprehensively, facilitating further optimization of mobility management.
在第一方面的一些实施例中，还包括：当小区选择过程选择了候选小区集合中的第二目标小区时，终端设备执行到第二目标小区的切换过程；当小区选择过程选择了不属于候选小区集合的第二目标小区时，终端设备执行与第二目标小区的无线资源控制RRC重建立过程；或当在第二预设时间段内无法找到合适小区时，终端设备转换到空闲态。In some embodiments of the first aspect, it further includes: when the cell selection process selects a second target cell in the candidate cell set, the terminal device performs a handover process to the second target cell; when the cell selection process selects a second target cell that does not belong to When the second target cell of the candidate cell set is used, the terminal device performs a radio resource control RRC re-establishment process with the second target cell; or when a suitable cell cannot be found within the second preset time period, the terminal device switches to an idle state.
在第一方面的一些实施例中，还包括：当小区选择过程选择了第二目标小区时，终端设备执行与第二目标小区的RRC重建立过程；或当在第二预设时间段内无法找到合适小区时，终端设备转换到空闲态。In some embodiments of the first aspect, it also includes: when the cell selection process selects the second target cell, the terminal device performs an RRC re-establishment process with the second target cell; or when the second target cell cannot be When a suitable cell is found, the terminal equipment transitions to the idle state.
如此，能够通过小区选择过程确定新的小区，进而针对新的小区执行小区切换等操作，保证了终端设备的切换连续性，提升了切换的效率。In this way, a new cell can be determined through the cell selection process, and operations such as cell handover can be performed on the new cell, thereby ensuring handover continuity of the terminal device and improving handover efficiency.
在第一方面的一些实施例中，还包括：当小区选择过程选择了第二目标小区且成功切换到第二目标小区时，终端设备发送第二消息，第二消息指示以下至少一项：第一预设时间段或次数阈值；切换过程的切换类型；发生切换失败的次数；发生切换失败时的时间；从发起切换过程到发生切换失败之间的第一时长；在发生切换失败时针对第一目标小区的第一测量信息；在发生切换失败时针对源小区的第二测量信息；在发生切换失败时针对候选小区集合中的其他候选小区的第三测量信息；是否执行回退；回退成功的次数；回退成功时的时间；回退成功时针对第一目标小区的第四测量信息；回退成功时针对源小区的第五测量信息；回退成功时针对候选小区集合中的其他候选小区的第六测量信息；从发生切换失败到回退成功之间的第二时长；是否回退失败；回退失败时的时间；回退失败时针对第一目标小区的第七测量信息；回退失败时针对源小区的第八测量信息；回退失败时针对候选小区集合中的其他候选小区的第九测量信息；从发生切换失败到回退失败之间的第三时长；从回退失败到成功选择第二目标小区之间的第四时长；或从发生切换失败到成功选择第二目标小区之间的第五时长。In some embodiments of the first aspect, it further includes: when the cell selection process selects the second target cell and successfully switches to the second target cell, the terminal device sends a second message, and the second message indicates at least one of the following: the first A preset time period or times threshold; the handover type of the handover process; the number of handover failures; the time when the handover failure occurs; The first measurement information of a target cell; the second measurement information for the source cell when a handover failure occurs; the third measurement information for other candidate cells in the candidate cell set when a handover failure occurs; whether to perform rollback; rollback The number of times of success; the time when the rollback is successful; the fourth measurement information for the first target cell when the rollback is successful; the fifth measurement information for the source cell when the rollback is successful; the other measurement information for the candidate cell set when the rollback is successful The sixth measurement information of the candidate cell; the second duration from the handover failure to the rollback success; whether the rollback fails; the time when the rollback fails; the seventh measurement information for the first target cell when the rollback fails; The eighth measurement information for the source cell when the fallback fails; the ninth measurement information for other candidate cells in the candidate cell set when the fallback fails; the third duration from the handover failure to the fallback failure; from the fallback A fourth time period between failure and successful selection of the second target cell; or a fifth time period between handover failure and successful selection of the second target cell.
如此，在成功选择切换的目标小区之后，终端设备能够通过第二消息向源小区的网络设备报告关于切换过程的各方面信息，从而网络设备能够更全面地了解切换过程，便于对移动 性管理进行进一步的优化。In this way, after successfully selecting the target cell for handover, the terminal device can report various aspects of the handover process to the network device of the source cell through the second message, so that the network device can understand the handover process more comprehensively, and facilitate mobility management. further optimization.
在第一方面的一些实施例中，回退指示信息是从源小区的网络设备接收到的，或者其中回退指示信息被预先配置在终端设备中。In some embodiments of the first aspect, the fallback indication information is received from the network device of the source cell, or the fallback indication information is preconfigured in the terminal device.
第二方面，提供了一种用于小区切换的方法。该方法包括：网络设备向终端设备发送回退指示信息，回退指示信息至少指示在切换失败时是否回退到源小区，网络设备为终端设备执行切换过程时的源小区的网络设备；以及当终端设备在切换过程中发生切换失败且回退指示信息指示在切换失败时回退到源小区时，网络设备基于终端设备的回退操作而执行与终端设备进行连接的操作。In a second aspect, a method for cell handover is provided. The method includes: the network device sends fallback instruction information to the terminal device, the fallback instruction information at least indicates whether to fall back to the source cell when the handover fails, and the network device is the network device of the source cell when the terminal device performs a handover process; and when When the terminal device fails in handover during the handover process and the fallback indication information indicates that the terminal device falls back to the source cell when the handover fails, the network device performs an operation of connecting with the terminal device based on the fallback operation of the terminal device.
在第二方面的一些实施例中，还包括：网络设备接收来自终端设备的切换报告消息，切换报告消息指示以下至少一项：第一预设时间段或次数阈值；切换过程的切换类型；发生切换失败的次数；发生切换失败时的时间；从发起切换过程到发生切换失败之间的第一时长；在发生切换失败时针对切换过程所切换至的第一目标小区的第一测量信息；在发生切换失败时针对源小区的第二测量信息；在发生切换失败时针对候选小区集合中的其他候选小区的第三测量信息；是否执行回退；回退成功的次数；回退成功时的时间；回退成功时针对第一目标小区的第四测量信息；回退成功时针对源小区的第五测量信息；回退成功时针对其他候选小区的第六测量信息；从发生切换失败到回退成功之间的第二时长；是否回退失败；回退失败时的时间；回退失败时针对第一目标小区的第七测量信息；回退失败时针对源小区的第八测量信息；回退失败时针对候选小区集合中的其他候选小区的第九测量信息；从发生切换失败到回退失败之间的第三时长；从回退失败到成功选择所驻留的小区之间的第四时长；或从发生切换失败到成功选择所驻留的小区之间的第五时长。In some embodiments of the second aspect, it also includes: the network device receives a handover report message from the terminal device, and the handover report message indicates at least one of the following: a first preset time period or a threshold value of times; a handover type of the handover process; occurrence The number of handover failures; the time when the handover failure occurs; the first duration from the initiation of the handover process to the occurrence of the handover failure; the first measurement information for the first target cell to which the handover process is handed over when the handover failure occurs; The second measurement information for the source cell when the handover failure occurs; the third measurement information for other candidate cells in the candidate cell set when the handover failure occurs; whether to perform rollback; the number of successful rollbacks; the time when the rollback is successful ; The fourth measurement information for the first target cell when the fallback is successful; the fifth measurement information for the source cell when the fallback is successful; the sixth measurement information for other candidate cells when the fallback is successful; From handover failure to fallback The second duration between successes; whether the rollback fails; the time when the rollback fails; the seventh measurement information for the first target cell when the rollback fails; the eighth measurement information for the source cell when the rollback fails; rollback Ninth measurement information for other candidate cells in the candidate cell set at the time of failure; the third time period from the handover failure to the fallback failure; the fourth time period from the fallback failure to the successful selection of the cell in which to reside ; or the fifth time period between when the handover fails to successfully select the cell to reside on.
第三方面，提供了一种通信装置。该通信装置包括：切换模块，被配置为执行从源小区到第一目标小区的切换过程，第一目标小区属于候选小区集合；第一确定模块，被配置为确定在切换过程中发生切换失败；第二确定模块，被配置为确定回退指示信息，回退指示信息至少指示在切换失败时是否回退到源小区；以及回退模块，被配置为当回退指示信息指示在切换失败时回退到源小区时，执行到源小区的回退操作。该通信装置可以用于实现前述第一方面或者第一方面的任一实施例所述的方法。In a third aspect, a communication device is provided. The communication device includes: a handover module configured to perform a handover process from a source cell to a first target cell, where the first target cell belongs to a set of candidate cells; a first determination module configured to determine that a handover failure occurs during the handover process; The second determination module is configured to determine the fallback indication information, and the fallback indication information at least indicates whether to fall back to the source cell when the handover fails; and the fallback module is configured to fall back when the fallback indication information indicates that the handover fails. When returning to the source cell, execute the fallback operation to the source cell. The communication device may be used to implement the first aspect or the method described in any embodiment of the first aspect.
第四方面，提供了一种通信装置。该通信装置包括：发送模块，被配置为向终端设备发送回退指示信息，回退指示信息至少指示在切换失败时是否回退到源小区，该通信装置为终端设备执行切换过程时的源小区的网络设备；以及连接模块，被配置为当终端设备在切换过程中发生切换失败且回退指示信息指示在切换失败时回退到源小区时，基于终端设备的回退操作而执行与终端设备进行连接的操作。该通信装置可以用于实现前述第二方面或者第二方面的任一实施例所述的方法。In a fourth aspect, a communication device is provided. The communication device includes: a sending module configured to send fallback indication information to the terminal equipment, the fallback indication information at least indicates whether to fall back to the source cell when the handover fails, and the communication device is the source cell when the terminal equipment performs the handover process a network device; and a connection module configured to perform a communication with the terminal device based on the fallback operation of the terminal device when the terminal device fails to switch during the handover process and the fallback indication information indicates that the switch fails to fall back to the source cell Perform the connection operation. The communication device may be used to implement the second aspect or the method described in any embodiment of the second aspect.
第五方面，提供了一种终端设备。该终端设备包括处理器以及存储器，存储器上存储有由处理器执行的指令，当指令被处理器执行时使得该终端设备实现：执行从源小区到第一目标小区的切换过程，第一目标小区属于候选小区集合；确定在切换过程中发生切换失败；确定回退指示信息，回退指示信息至少指示在切换失败时是否回退到源小区；以及当回退指示信息指示在切换失败时回退到源小区时，执行到源小区的回退操作。In a fifth aspect, a terminal device is provided. The terminal device includes a processor and a memory, and the memory stores instructions executed by the processor. When the instructions are executed by the processor, the terminal device realizes: performing a handover process from the source cell to the first target cell, the first target cell Belonging to the set of candidate cells; determining that a handover failure occurs during the handover process; determining fallback indication information, the fallback indication information at least indicates whether to fall back to the source cell when the handover fails; When arriving at the source cell, perform a fallback operation to the source cell.
在第五方面的一些实施例中，处理器执行指令使得该终端设备实现：当从发起切换过程开始经过的时间达到第一预设时间段时或者当发生切换失败的次数达到次数阈值时，执行小区选择过程。In some embodiments of the fifth aspect, the processor executes instructions so that the terminal device realizes: when the time elapsed from initiating the handover process reaches a first preset time period or when the number of times of handover failures reaches a threshold value, execute Cell selection process.
在第五方面的一些实施例中，处理器执行指令使得该终端设备实现：当经过的时间达到第一预设时间段或者发生特定事件的次数达到次数阈值时，执行小区选择过程；其中第一预设时间段的起始时刻可以是接收到第一切换配置消息时、开始执行切换过程时、或者发生切换失败时；其中特定事件可以是发生切换失败时、发生回退时、回退成功时、或者触发切换时。In some embodiments of the fifth aspect, the processor executes instructions to enable the terminal device to implement: when the elapsed time reaches a first preset time period or the number of occurrences of a specific event reaches a number threshold, execute a cell selection process; wherein the first The starting moment of the preset time period may be when the first handover configuration message is received, when the handover process is started, or when handover failure occurs; the specific event may be when handover failure occurs, when rollback occurs, and when rollback succeeds , or when switching is triggered.
在第五方面的一些实施例中，处理器执行指令使得该终端设备实现：当确定回退操作失败时，执行小区选择过程。In some embodiments of the fifth aspect, the processor executes instructions so that the terminal device implements: when it is determined that the rollback operation fails, perform a cell selection process.
在第五方面的一些实施例中，处理器执行指令使得该终端设备实现：当回退指示信息指示在切换失败时不回退到源小区时，执行小区选择过程。In some embodiments of the fifth aspect, the processor executes instructions so that the terminal device implements: when the fallback indication information indicates not to fall back to the source cell when the handover fails, execute a cell selection process.
在第五方面的一些实施例中，回退指示信息还指示以下至少一项：第一预设时间段或次数阈值。In some embodiments of the fifth aspect, the rollback indication information further indicates at least one of the following: a first preset time period or a times threshold.
在第五方面的一些实施例中，处理器执行指令使得该终端设备实现：经由收发器向源小区的网络设备发送第一消息，第一消息指示以下至少一项：第一预设时间段或次数阈值；切换过程的切换类型；发生切换失败的次数；发生切换失败时的时间；从发起切换过程到发生切换失败之间的第一时长；在发生切换失败时针对第一目标小区的第一测量信息；在发生切换失败时针对源小区的第二测量信息；在发生切换失败时针对候选小区集合中的其他候选小区的第三测量信息；是否执行回退；回退成功的次数；回退成功时的时间；回退成功时针对第一目标小区的第四测量信息；回退成功时针对源小区的第五测量信息；回退成功时针对其他候选小区的第六测量信息；从发生切换失败到回退成功之间的第二时长；是否回退失败；回退失败时的时间；回退失败时针对第一目标小区的第七测量信息；回退失败时针对源小区的第八测量信息；回退失败时针对候选小区集合中的其他候选小区的第九测量信息；或从发生切换失败到回退失败之间的第三时长。In some embodiments of the fifth aspect, the processor executes instructions to enable the terminal device to: send a first message to the network device of the source cell via a transceiver, and the first message indicates at least one of the following: a first preset time period or The number of thresholds; the handover type of the handover process; the number of handover failures; the time when the handover failure occurs; the first duration from the initiation of the handover process to the handover failure; Measurement information; second measurement information for the source cell when handover failure occurs; third measurement information for other candidate cells in the candidate cell set when handover failure occurs; whether to perform rollback; the number of successful rollbacks; rollback The time when it succeeds; the fourth measurement information for the first target cell when the rollback is successful; the fifth measurement information for the source cell when the rollback is successful; the sixth measurement information for other candidate cells when the rollback is successful; The second duration between the failure and the rollback success; whether the rollback failed; the time when the rollback failed; the seventh measurement information for the first target cell when the rollback failed; the eighth measurement for the source cell when the rollback failed information; the ninth measurement information for other candidate cells in the candidate cell set when the fallback fails; or the third time length between the occurrence of the handover failure and the fallback failure.
在第五方面的一些实施例中，处理器执行指令使得该终端设备实现：当小区选择过程选择了候选小区集合中的第二目标小区时，执行到第二目标小区的切换过程；当小区选择过程选择了不属于候选小区集合的第二目标小区时，执行与第二目标小区的无线资源控制RRC重建立过程；或当在第二预设时间段内无法找到合适小区时，转换到空闲态。In some embodiments of the fifth aspect, the processor executes instructions to cause the terminal device to implement: when the cell selection process selects the second target cell in the candidate cell set, perform a handover process to the second target cell; when the cell selection When the process selects a second target cell that does not belong to the candidate cell set, execute the radio resource control RRC re-establishment process with the second target cell; or when a suitable cell cannot be found within the second preset time period, switch to the idle state .
在第五方面的一些实施例中，处理器执行指令使得该终端设备实现：当小区选择过程选择了第二目标小区时，执行与第二目标小区的RRC重建立过程；或当在第二预设时间段内无法找到合适小区时，转换到空闲态。In some embodiments of the fifth aspect, the processor executes instructions so that the terminal device realizes: when the cell selection process selects the second target cell, execute the RRC re-establishment process with the second target cell; or when the second preset When a suitable cell cannot be found within the set time period, it will switch to the idle state.
在第五方面的一些实施例中，处理器执行指令使得该终端设备实现：当小区选择过程选择了第二目标小区且成功切换到第二目标小区时，经由收发器发送第二消息，第二消息指示以下至少一项：第一预设时间段或次数阈值；切换过程的切换类型；发生切换失败的次数；发生切换失败时的时间；从发起切换过程到发生切换失败之间的第一时长；在发生切换失败时针对第一目标小区的第一测量信息；在发生切换失败时针对源小区的第二测量信息；在发生切换失败时针对候选小区集合中的其他候选小区的第三测量信息；是否执行回退；回退成功的次数；回退成功时的时间；回退成功时针对第一目标小区的第四测量信息；回退成功时针对源小区的第五测量信息；回退成功时针对候选小区集合中的其他候选小区的第六测量信息；从发生切换失败到回退成功之间的第二时长；是否回退失败；回退失败时的时间；回退失败时针对第一目标小区的第七测量信息；回退失败时针对源小区的第八测量信息；回退失败时针对候选小区集合中的其他候选小区的第九测量信息；从发生切换失败到回退失败之间 的第三时长；从回退失败到成功选择第二目标小区之间的第四时长；或从发生切换失败到成功选择第二目标小区之间的第五时长。In some embodiments of the fifth aspect, the processor executes instructions so that the terminal device realizes: when the cell selection process selects the second target cell and successfully switches to the second target cell, sending the second message via the transceiver, the second The message indicates at least one of the following: a first preset time period or a threshold value of times; a handover type of the handover process; the number of handover failures; the time when the handover failure occurs; ; first measurement information for the first target cell when handover failure occurs; second measurement information for the source cell when handover failure occurs; third measurement information for other candidate cells in the candidate cell set when handover failure occurs ;Whether to perform fallback; the number of successful fallbacks; the time when the fallback is successful; the fourth measurement information for the first target cell when the fallback is successful; the fifth measurement information for the source cell when the fallback is successful; the fallback is successful The sixth measurement information for other candidate cells in the candidate cell set; the second duration from the handover failure to the fallback success; whether the fallback failed; the time when the fallback failed; The seventh measurement information of the target cell; the eighth measurement information for the source cell when the fallback fails; the ninth measurement information for other candidate cells in the candidate cell set when the fallback fails; between the occurrence of the handover failure and the fallback failure The third time period between the fallback failure and the successful selection of the second target cell; or the fifth time period between the handover failure and the successful selection of the second target cell.
在第五方面的一些实施例中，回退指示信息是从源小区的网络设备接收到的，或者其中回退指示信息被预先配置在终端设备中。In some embodiments of the fifth aspect, the fallback indication information is received from the network device of the source cell, or the fallback indication information is preconfigured in the terminal device.
第六方面，提供了一种网络设备。该网络设备包括处理器以及存储器，存储器上存储有由处理器执行的指令，当指令被处理器执行时使得该网络设备实现：经由收发器向终端设备发送回退指示信息，回退指示信息至少指示在切换失败时是否回退到源小区，网络设备为终端设备执行切换过程时的源小区的网络设备；以及当终端设备在切换过程中发生切换失败且回退指示信息指示在切换失败时回退到源小区时，基于终端设备的回退操作而执行与终端设备进行连接的操作。In a sixth aspect, a network device is provided. The network device includes a processor and a memory, and the memory stores instructions executed by the processor. When the instructions are executed by the processor, the network device realizes: sending fallback instruction information to the terminal device via a transceiver, the fallback instruction information being at least Indicate whether to fall back to the source cell when the handover fails, and the network device is the network device of the source cell when the terminal device performs the handover process; When falling back to the source cell, an operation of connecting with the terminal device is performed based on the fallback operation of the terminal device.
在第六方面的一些实施例中，处理器执行指令使得该网络设备实现：经由收发器接收来自终端设备的切换报告消息，切换报告消息指示以下至少一项：第一预设时间段或次数阈值；切换过程的切换类型；发生切换失败的次数；发生切换失败时的时间；从发起切换过程到发生切换失败之间的第一时长；在发生切换失败时针对切换过程所切换至的第一目标小区的第一测量信息；在发生切换失败时针对源小区的第二测量信息；在发生切换失败时针对候选小区集合中的其他候选小区的第三测量信息；是否执行回退；回退成功的次数；回退成功时的时间；回退成功时针对第一目标小区的第四测量信息；回退成功时针对源小区的第五测量信息；回退成功时针对其他候选小区的第六测量信息；从发生切换失败到回退成功之间的第二时长；是否回退失败；回退失败时的时间；回退失败时针对第一目标小区的第七测量信息；回退失败时针对源小区的第八测量信息；回退失败时针对候选小区集合中的其他候选小区的第九测量信息；从发生切换失败到回退失败之间的第三时长；从回退失败到成功选择所驻留的小区之间的第四时长；或从发生切换失败到成功选择所驻留的小区之间的第五时长。In some embodiments of the sixth aspect, the processor executes instructions to enable the network device to: receive a handover report message from the terminal device via a transceiver, and the handover report message indicates at least one of the following: a first preset time period or a threshold of times ;The handover type of the handover process; the number of handover failures; the time when the handover failure occurs; the first duration from the initiation of the handover process to the handover failure; the first target for the handover process when the handover failure occurs The first measurement information of the cell; the second measurement information for the source cell when a handover failure occurs; the third measurement information for other candidate cells in the candidate cell set when a handover failure occurs; whether to perform rollback; whether the rollback is successful The number of times; the time when the rollback is successful; the fourth measurement information for the first target cell when the rollback is successful; the fifth measurement information for the source cell when the rollback is successful; the sixth measurement information for other candidate cells when the rollback is successful ;The second duration from the handover failure to the fallback success; whether the fallback failed; the time when the fallback failed; the seventh measurement information of the first target cell when the fallback failed; the source cell when the fallback failed The eighth measurement information; the ninth measurement information for other candidate cells in the candidate cell set when the fallback fails; the third time period from the handover failure to the fallback failure; from the fallback failure to the successful selection of the resident or the fifth time period between the time when the handover fails and the cell where the cell resides is successfully selected.
第七方面，提供了一种计算机可读存储介质，该计算机可读存储介质上存储有计算机可执行指令，该计算机可执行指令被处理器执行时实现根据上述第一方面或其任一实施例中的方法的操作，或者实现根据上述第二方面或其任一实施例中的方法的操作。In a seventh aspect, there is provided a computer-readable storage medium, the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the computer-readable storage medium according to the above-mentioned first aspect or any embodiment thereof is implemented. The operation of the method in the method, or realize the operation of the method according to the above second aspect or any embodiment thereof.
第八方面，提供了一种芯片或芯片***。该芯片或芯片***包括处理电路，被配置为执行根据上述第一方面或其任一实施例中的方法的操作，或者执行根据上述第二方面或其任一实施例中的方法的操作。In an eighth aspect, a chip or a chip system is provided. The chip or chip system includes a processing circuit configured to perform operations according to the method in the above first aspect or any embodiment thereof, or perform operations according to the method in the above second aspect or any embodiment thereof.
第九方面，提供了一种计算机程序或计算机程序产品。该计算机程序或计算机程序产品被有形地存储在计算机可读介质上并且包括计算机可执行指令，计算机可执行指令在被执行时实现根据上述第一方面或其任一实施例中的方法的操作，或者实现根据上述第二方面或其任一实施例中的方法的操作。In a ninth aspect, a computer program or computer program product is provided. The computer program or computer program product is tangibly stored on a computer-readable medium and comprises computer-executable instructions which, when executed, implement the operations according to the method in the above-mentioned first aspect or any of its embodiments, Or implement the operations according to the method in the above second aspect or any embodiment thereof.
附图说明Description of drawings
图1示出了终端设备从源小区切换到目标小区的常规切换过程的交互信令图；FIG. 1 shows an interactive signaling diagram of a conventional handover process in which a terminal device is handed over from a source cell to a target cell;
图2示出了本公开实施例可实现在其中的通信***的一个示意图；FIG. 2 shows a schematic diagram of a communication system in which embodiments of the present disclosure can be implemented;
图3示出了根据本公开的一些实施例的终端设备从源小区成功切换到目标小区的切换过程的交互信令图；FIG. 3 shows an interactive signaling diagram of a handover process in which a terminal device is successfully handed over from a source cell to a target cell according to some embodiments of the present disclosure;
图4示出了根据本公开的一些实施例的终端设备执行小区切换的过程的示意流程图；Fig. 4 shows a schematic flowchart of a process in which a terminal device performs cell handover according to some embodiments of the present disclosure;
图5示出了根据本公开的一些实施例的在发生切换失败之后终端设备执行的过程的示意 流程图；Figure 5 shows a schematic flowchart of a process performed by a terminal device after a handover failure occurs according to some embodiments of the present disclosure;
图6示出了根据本公开的一些实施例的用于小区切换的过程的示意流程图；FIG. 6 shows a schematic flowchart of a process for cell handover according to some embodiments of the present disclosure;
图7示出了根据本公开的一些实施例的用于小区切换的通信装置的一个示意框图；Fig. 7 shows a schematic block diagram of a communication device for cell handover according to some embodiments of the present disclosure;
图8示出了根据本公开的一些实施例的用于小区切换的通信装置的另一示意框图；以及FIG. 8 shows another schematic block diagram of a communication device for cell handover according to some embodiments of the present disclosure; and
图9示出了可以用来实施本公开的实施例的示例设备的示意性框图。Fig. 9 shows a schematic block diagram of an example device that may be used to implement embodiments of the present disclosure.
具体实施方式Detailed ways
下面将参照附图更详细地描述本公开的实施例。虽然附图中显示了本公开的某些实施例，然而应当理解的是，本公开可以通过各种形式来实现，而且不应该被解释为限于这里阐述的实施例，相反提供这些实施例是为了更加透彻和完整地理解本公开。应当理解的是，本公开的附图及实施例仅用于示例性作用，并非用于限制本公开的保护范围。Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the drawings, it should be understood that the disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein; A more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for exemplary purposes only, and are not intended to limit the protection scope of the present disclosure.
在本公开的实施例的描述中，术语“包括”及其类似用语应当理解为开放性包含，即“包括但不限于”。术语“基于”应当理解为“至少部分地基于”。术语“一个实施例”或“该实施例”应当理解为“至少一个实施例”。术语“第一”、“第二”等等可以指代不同的或相同的对象。下文还可能包括其他明确的和隐含的定义。In the description of the embodiments of the present disclosure, the term "comprising" and its similar expressions should be interpreted as an open inclusion, that is, "including but not limited to". The term "based on" should be understood as "based at least in part on". The term "one embodiment" or "the embodiment" should be read as "at least one embodiment". The terms "first", "second", etc. may refer to different or the same object. Other definitions, both express and implied, may also be included below.
本公开的实施例可以根据适当的通信协议来实施，包括但不限于，第三代(3rd Generation，3G)、***(4G)、第五代(5G)等蜂窝通信协议、诸如电气与电子工程师协会(Institute of Electrical and Electronics Engineers，IEEE)802.11等的无线局域网通信协议、未来演进的移动通信***例如6G通信***协议、和/或目前已知或者将来开发的其他协议。Embodiments of the present disclosure can be implemented according to appropriate communication protocols, including but not limited to, third generation (3rd Generation, 3G), fourth generation (4G), fifth generation (5G) and other cellular communication protocols, such as electrical and Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers, IEEE) 802.11 and other wireless local area network communication protocols, future evolved mobile communication systems such as 6G communication system protocols, and/or other protocols currently known or developed in the future.
本公开的实施例的技术方案应用于遵循任何适当通信协议的通信***，例如：通用移动通信***(Universal Mobile Telecommunications Service，UMTS)、长期演进(Long Term Evolution，LTE)***、宽带码分多址***(Wideband Code Division Multiple Access，WCDMA)、码分多址2000***(Code Division Multiple Access，CDMA2000)、时分同步码分多址***(Time Division-Synchronization Code Division Multiple Access，TD-SCDMA)、频分双工(Frequency Division Duplex，FDD)***、时分双工(Time Division Duplex，TDD)、第五代(5G)***或新无线电(New Radio，NR)、未来演进的6G通信***，等等。The technical solution of the embodiment of the present disclosure is applied to a communication system following any appropriate communication protocol, such as: Universal Mobile Telecommunications System (Universal Mobile Telecommunications Service, UMTS), Long Term Evolution (Long Term Evolution, LTE) system, wideband code division multiple access System (Wideband Code Division Multiple Access, WCDMA), Code Division Multiple Access 2000 system (Code Division Multiple Access, CDMA2000), Time Division Synchronization Code Division Multiple Access system (Time Division-Synchronization Code Division Multiple Access, TD-SCDMA), frequency division Duplex (Frequency Division Duplex, FDD) system, Time Division Duplex (Time Division Duplex, TDD), fifth generation (5G) system or new radio (New Radio, NR), future evolution of 6G communication system, etc.
出于说明的目的，下文中以3GPP中的NR通信***为背景来描述本公开的实施例。然而，应当理解，本公开的实施例不限于该通信***，而是可以被应用到任何存在类似问题的通信***中，例如无线局域网(WLAN)、有线通信***、或者将来开发的其他通信***等。For illustration purposes, embodiments of the present disclosure are described below in the context of an NR communication system in 3GPP. However, it should be understood that the embodiments of the present disclosure are not limited to this communication system, but can be applied to any communication system with similar problems, such as wireless local area network (WLAN), wired communication system, or other communication systems developed in the future, etc. .
在本公开中使用的术语“终端设备”指能够与网络设备之间或者彼此之间进行有线或无线通信的任何终端设备。终端设备有时可以称为用户设备(User Equipment，UE)。终端设备可以是任意类型的移动终端、固定终端或便携式终端。作为示例，终端设备可以包括移动手机、站点、单元、设备、移动终端(Mobile Terminal，MT)、订阅台、便携式订阅台、互联网节点、通信器、台式计算机、膝上型计算机、笔记本计算机、平板计算机、个人通信***设备、个人导航设备、个人数字助理(Personal Digital Assistant，PDA)、定位设备、无线电广播接收器、电子书设备、游戏设备、物联网(Internet of Things，IoT)设备、车载设备、飞行器、虚拟现实(Virtual Reality，VR)设备、增强现实(Augmented Reality，AR)设备、可穿戴设备、5G网络中的终端设备或者演进的公用陆地移动网络(Public Land Mobile Network，PLMN)中的任何终端设备、可用于通信的其他设备、或者上述的任意组合。本公开的实施例对此并不做限定。The term "terminal device" used in this disclosure refers to any terminal device capable of wired or wireless communication with network devices or with each other. The terminal equipment may sometimes be called user equipment (User Equipment, UE). A terminal device may be any type of mobile terminal, stationary terminal or portable terminal. As examples, terminal equipment may include a mobile handset, station, unit, device, mobile terminal (Mobile Terminal, MT), subscription station, portable subscription station, Internet node, communicator, desktop computer, laptop computer, notebook computer, tablet Computers, personal communication system devices, personal navigation devices, personal digital assistants (Personal Digital Assistant, PDA), positioning devices, radio broadcast receivers, e-book devices, game devices, Internet of Things (IoT) devices, vehicle-mounted devices , aircraft, virtual reality (Virtual Reality, VR) devices, augmented reality (Augmented Reality, AR) devices, wearable devices, terminal devices in 5G networks or evolved Public Land Mobile Networks (Public Land Mobile Network, PLMN) Any terminal device, other device that can be used for communication, or any combination of the above. Embodiments of the present disclosure do not limit this.
在本公开中使用的术语“网络设备”是可以用于与终端设备通信的实体或节点，例如可以是接入网设备。接入网设备可以是部署在无线接入网中为移动终端提供无线通信功能的装置，例如可以是无线接入网(Radio Access Network，RAN)网络设备。接入网设备可以包括各种类型的基站。作为示例，接入网设备可以包括各种形式的宏基站、微基站、微微基站、毫微微基站、中继站、接入点、远程无线电单元(Remote Radio Unit，RRU)、射频头(Radio Head，RH)、远程无线电头端(Remote Radio Head，RRH)等等。在采用不同的无线接入技术的***中，接入网设备的名称可能会有所不同，例如在长期演进***(Long Term Evolution，LTE)网络中称为演进的节点B(evolved NodeB，eNB或eNodeB)，在3G网络中称为节点B(NodeB，NB)，在5G网络中可以称为g节点B(gNB)或NR节点B(NR NB)，等等。在某些场景下，接入网设备可以包含集中单元(Central Unit，CU)和/或分布单元(Distributed Unit，DU)。CU和DU可以放置在不同的地方，例如：DU拉远，放置于高话务量的区域，CU放置于中心机房。或者，CU和DU也可以放置在同一机房。CU和DU也可以为一个机架下的不同部件。为方便描述，本公开后续的实施例中，上述为移动终端提供无线通信功能的装置统称为网络设备，本公开的实施例不再具体限定。The term "network device" used in this disclosure is an entity or node that can be used to communicate with a terminal device, such as an access network device. The access network device may be a device deployed in the radio access network to provide a wireless communication function for the mobile terminal, for example, it may be a radio access network (Radio Access Network, RAN) network device. Access network equipment may include various types of base stations. As an example, the access network equipment may include various forms of macro base stations, micro base stations, pico base stations, femto base stations, relay stations, access points, remote radio units (Remote Radio Unit, RRU), radio heads (Radio Head, RH ), Remote Radio Head (RRH) and so on. In systems using different radio access technologies, the names of access network equipment may be different, for example, in a Long Term Evolution (LTE) network, it is called an evolved NodeB (evolved NodeB, eNB or eNodeB), which is called Node B (NodeB, NB) in 3G network, can be called gNode B (gNB) or NR Node B (NR NB) in 5G network, and so on. In some scenarios, the access network device may include a central unit (Central Unit, CU) and/or a distributed unit (Distributed Unit, DU). CU and DU can be placed in different places, for example: DU is remote and placed in a high-traffic area, and CU is placed in the central computer room. Alternatively, the CU and DU can also be placed in the same equipment room. The CU and DU can also be different components under one rack. For the convenience of description, in subsequent embodiments of the present disclosure, the above-mentioned apparatuses for providing wireless communication functions for mobile terminals are collectively referred to as network devices, which are not specifically limited in the embodiments of the present disclosure.
图1示出了终端设备从源小区切换到目标小区的常规切换过程100的交互信令图。图1中涉及终端设备101、源小区的网络设备102以及目标小区的网络设备103。Fig. 1 shows an interactive signaling diagram of a conventional handover process 100 in which a terminal device is handed over from a source cell to a target cell. FIG. 1 involves a terminal device 101 , a network device 102 of a source cell, and a network device 103 of a target cell.
在过程100中，源小区的网络设备102向目标小区的网络设备103发送110切换请求。具体而言，由源小区发起切换，并且源小区的网络设备102可以经由源小区的网络设备102与目标小区的网络设备103之间的Xn接口发送切换请求。该切换请求可以至少包括终端设备101的标识。In the process 100, the network device 102 of the source cell sends 110 a handover request to the network device 103 of the target cell. Specifically, the source cell initiates the handover, and the network device 102 of the source cell may send a handover request via the Xn interface between the network device 102 of the source cell and the network device 103 of the target cell. The handover request may include at least the identifier of the terminal device 101 .
目标小区的网络设备103执行120准入控制(Admission control)。具体而言，目标小区的网络设备103可以基于切换请求确定终端设备101进行切换所需的无线资源控制(Radio Resource Control，RRC)重配置信息。RRC重配置信息可以包括目标小区的小区标识以及终端设备101接入目标小区所需的接入信息。The network device 103 of the target cell performs 120 admission control (Admission control). Specifically, the network device 103 of the target cell may determine the radio resource control (Radio Resource Control, RRC) reconfiguration information required by the terminal device 101 for handover based on the handover request. The RRC reconfiguration information may include a cell identity of the target cell and access information required by the terminal device 101 to access the target cell.
目标小区的网络设备103向源小区的网络设备102发送130切换请求确认消息，该切换请求确认消息包括RRC重配置信息。The network device 103 of the target cell sends 130 a handover request confirmation message to the network device 102 of the source cell, where the handover request confirmation message includes RRC reconfiguration information.
源小区的网络设备102向终端设备101发送140切换消息，该切换消息包括RRC重配置信息。具体而言，源小区的网络设备102在接收到切换请求确认消息之后，可以从中提取RRC重配置信息，并通过切换消息将RRC重配置信息转发到终端设备101。在诸如LTE的通信***中，该切换消息可以通过移动控制信息(MobilityControlInfo)信元来携带RRC重配置信息。在诸如NR的通信***中，该切换消息可以通过具有同步的重配(ReconfigurationWithSync)信元来携带RRC重配置信息。The network device 102 of the source cell sends 140 a handover message to the terminal device 101, where the handover message includes RRC reconfiguration information. Specifically, after receiving the handover request confirmation message, the network device 102 of the source cell can extract the RRC reconfiguration information therefrom, and forward the RRC reconfiguration information to the terminal device 101 through a handover message. In a communication system such as LTE, the handover message may carry RRC reconfiguration information through a mobility control information (MobilityControlInfo) information element. In a communication system such as NR, the handover message may carry RRC reconfiguration information through a reconfiguration with sync (ReconfigurationWithSync) information element.
终端设备101基于RRC重配置信息切换150到目标小区。具体而言，终端设备101可以基于RRC重配置信息，而无需再获取来自目标小区的网络设备103的***信息，便可以接入到目标小区。随后，终端设备101向目标小区的网络设备103发送160RRC重配置完成消息。The terminal device 101 handovers 150 to the target cell based on the RRC reconfiguration information. Specifically, the terminal device 101 can access the target cell based on the RRC reconfiguration information without acquiring system information from the network device 103 of the target cell. Subsequently, the terminal device 101 sends 160 an RRC reconfiguration complete message to the network device 103 of the target cell.
这样，通过过程100，可以实现终端设备101从源小区到目标小区的切换过程。但是，在过程100中，随着源小区的网络设备102向终端设备101发送切换消息(即图1中的140)，源小区的网络设备102与终端设备101之间的数据传输也发生了中断。在终端设备101向目标小区的网络设备103发送RRC重配置完成消息(即图1中的160)之后，目标小区的网络设备103开始与终端设备101进行数据传输。可见，在如图1所示的切换过程中，存在中断 时延。另外，如果在如图1的过程100中发生了切换失败，那么终端设备101需要重新执行小区选择，这样导致了切换的效率低。In this way, through the process 100, the handover process of the terminal device 101 from the source cell to the target cell can be realized. However, in the process 100, as the network device 102 of the source cell sends a handover message to the terminal device 101 (that is, 140 in FIG. 1 ), the data transmission between the network device 102 of the source cell and the terminal device 101 is also interrupted. . After the terminal device 101 sends an RRC reconfiguration complete message (ie 160 in FIG. 1 ) to the network device 103 of the target cell, the network device 103 of the target cell starts data transmission with the terminal device 101 . It can be seen that in the switching process shown in Figure 1, there is an interruption delay. In addition, if a handover failure occurs in the process 100 as shown in FIG. 1 , the terminal device 101 needs to re-execute cell selection, which leads to low handover efficiency.
有鉴于此，本公开的实施例提供了一种小区切换的方案。尤其地，在发生小区切换失败时，可以基于回退指示信息确定是否回退到源小区，如此能提升切换的效率。In view of this, embodiments of the present disclosure provide a solution for cell handover. In particular, when cell handover fails, whether to fall back to the source cell can be determined based on the fallback indication information, which can improve the efficiency of handover.
图2示出了本公开实施例可实现在其中的通信***200的一个示意图。图2所示的***200包括终端设备210，该终端设备210位于小区222中，且小区222的网络设备为网络设备232。图2中还示出了小区224和小区226，以及小区224的网络设备234和小区226的网络设备236。FIG. 2 shows a schematic diagram of a communication system 200 in which embodiments of the present disclosure may be implemented. The system 200 shown in FIG. 2 includes a terminal device 210 , the terminal device 210 is located in a cell 222 , and the network device of the cell 222 is a network device 232 . Also shown in FIG. 2 are cell 224 and cell 226 , and network device 234 of cell 224 and network device 236 of cell 226 .
终端设备210能够与网络设备232进行通信。在一些场景下，随着终端设备210的移动等因素，终端设备210可能会到达小区222的边缘，或者，网络设备232与终端设备210之间的信号质量会变差，从而触发小区切换过程。在小区切换的场景下，可以将终端设备210当前所在的小区222称为源小区，相应地可以将小区222的网络设备232称为源网络设备。可以将小区224称为第一目标小区，相应地可以将网络设备234称为第一目标网络设备。类似地，可以将小区226称为第二目标小区，相应地可以将网络设备236称为第二目标网络设备。或者可选地，可以将小区224和小区226统称为候选(candidate)小区。 Terminal device 210 is capable of communicating with network device 232 . In some scenarios, due to factors such as the movement of the terminal device 210, the terminal device 210 may reach the edge of the cell 222, or the signal quality between the network device 232 and the terminal device 210 may deteriorate, thereby triggering a cell handover process. In a cell handover scenario, the cell 222 where the terminal device 210 is currently located may be called a source cell, and the network device 232 of the cell 222 may be called a source network device accordingly. The cell 224 may be called a first target cell, and the network device 234 may be called a first target network device accordingly. Similarly, cell 226 may be called a second target cell, and network device 236 may be called a second target network device accordingly. Alternatively, the cell 224 and the cell 226 may be collectively referred to as a candidate (candidate) cell.
可理解的是，图2仅是示意，尽管图2中示出了小区224和小区226两个目标小区，但是本公开的实施例对目标小区的数量等不作限定。另外，还应理解的是，源小区与候选小区、目标小区等术语仅是示意，针对不同的终端设备或不同的切换场景，该术语可能是变化的，这里不再赘述。It can be understood that FIG. 2 is only a schematic diagram. Although two target cells, cell 224 and cell 226 are shown in FIG. 2 , the embodiments of the present disclosure do not limit the number of target cells. In addition, it should also be understood that terms such as source cell, candidate cell, and target cell are only illustrative, and the terms may vary for different terminal devices or different handover scenarios, and details are not repeated here.
下面将结合图2所示的通信***200描述本公开的一些实施例。Some embodiments of the present disclosure will be described below in conjunction with the communication system 200 shown in FIG. 2 .
图3示出了根据本公开的一些实施例的终端设备从源小区成功切换到目标小区的切换过程300的交互信令图。如图示，过程300涉及终端设备210、源网络设备232、第一目标网络设备234和第二目标网络设备236。也就是说，过程300以终端设备210的切换过程为例进行阐述，可理解，该过程对于其他的终端设备的切换也是适用的，这里不再赘述。Fig. 3 shows an interactive signaling diagram of a handover process 300 in which a terminal device is successfully handed over from a source cell to a target cell according to some embodiments of the present disclosure. As shown, process 300 involves end device 210 , source network device 232 , first target network device 234 , and second target network device 236 . That is to say, the process 300 is described by taking the switching process of the terminal device 210 as an example. It can be understood that this process is also applicable to the switching of other terminal devices, and details are not repeated here.
源网络设备232向终端设备210发送302测量配置信息。终端设备210基于测量配置信息执行304测量，并且终端设备210向源网络设备232发送306测量报告。具体而言，终端设备210可以周期性地执行测量并相应地周期性地发送测量报告。测量报告可以包括终端设备210测量得到的各个小区(如小区222、小区224和小区226)的测量结果，例如如下至少一项：信干噪比(Signal to Interference plus Noise Ratio，SINR)、接收信号强度(Received Signal Strength Indication，RSSI)、参考信号接收功率(Reference Signal Received Power，RSRP)、参考信号接收质量(Reference Signal Received Quality，RSRQ)等。The source network device 232 sends 302 the measurement configuration information to the terminal device 210 . The terminal device 210 performs 304 measurements based on the measurement configuration information, and the terminal device 210 sends 306 a measurement report to the source network device 232 . Specifically, the terminal device 210 may periodically perform measurement and correspondingly periodically send a measurement report. The measurement report may include the measurement results of each cell (such as the cell 222, the cell 224, and the cell 226) measured by the terminal device 210, such as at least one of the following: Signal to Interference plus Noise Ratio (SINR), received signal Strength (Received Signal Strength Indication, RSSI), Reference Signal Received Power (Reference Signal Received Power, RSRP), Reference Signal Received Quality (Reference Signal Received Quality, RSRQ), etc.
源网络设备232确定308切换类型。本公开的实施例中的切换类型可以是混合切换类型，或者也可以称为双激活协议栈(Dual Active Protocol Stack，DAPS)切换和条件切换(Conditional Handover，CHO)复合类型，简化表示为DAPS+CHO。但是应注意的是，本公开不限于此，例如切换类型可以为DAPS切换，或者切换类型可以为CHO，或者切换类型可以为其他类型，这里不再罗列。The source network device 232 determines 308 the handover type. The handover type in the embodiments of the present disclosure may be a hybrid handover type, or may also be called a dual active protocol stack (Dual Active Protocol Stack, DAPS) handover and a conditional handover (Conditional Handover, CHO) composite type, which is simplified as DAPS+ Cho. However, it should be noted that the present disclosure is not limited thereto. For example, the handover type may be DAPS handover, or the handover type may be CHO, or the handover type may be other types, which will not be listed here.
源网络设备232向候选小区集合中每个候选小区的网络设备发送310切换请求。具体而言，源网络设备232向第一目标网络设备234发送3102第一切换请求，向第二目标网络设备236发送3104第二切换请求。The source network device 232 sends 310 a handover request to the network device of each candidate cell in the candidate cell set. Specifically, the source network device 232 sends 3102 a first handover request to the first target network device 234 , and sends 3104 a second handover request to the second target network device 236 .
可理解，候选小区集合中包括至少一个候选小区，至少一个候选小区可以是源网络设备 232基于测量报告所确定的，并且可理解至少一个候选小区的数量是基于实际情况所确定的，例如可以为1个或2个或更多个等。并且应理解，尽管此处的实施例示出了候选小区集合包括第一目标小区224和第二目标小区226，但是本公开不限于此。It can be understood that the set of candidate cells includes at least one candidate cell, and the at least one candidate cell can be determined by the source network device 232 based on the measurement report, and it can be understood that the number of at least one candidate cell is determined based on actual conditions, for example, it can be 1 or 2 or more etc. And it should be understood that although the embodiment herein shows that the set of candidate cells includes the first target cell 224 and the second target cell 226, the present disclosure is not limited thereto.
至少一个候选小区的网络设备234/236执行312准入控制(admission control)。具体而言，第一目标网络设备234执行3122准入控制，且第二目标网络236执行3124准入控制。The network device 234/236 of at least one candidate cell performs 312 admission control. Specifically, the first target network device 234 performs 3122 admission control, and the second target network 236 performs 3124 admission control.
至少一个候选小区的网络设备234/236向源网络设备232发送314切换请求确认消息。具体而言，第一目标网络设备234向源网络设备232发送3142第一切换请求确认消息，该第一切换请求确认消息可以包括第一目标网络设备234的第一配置信息。第二目标网络设备236向源网络设备232发送3144第二切换请求确认消息，该第二切换请求确认消息可以包括第二目标网络设备236的第二配置信息。The network device 234/236 of at least one candidate cell sends 314 a handover request confirmation message to the source network device 232 . Specifically, the first target network device 234 sends 3142 a first handover request confirmation message to the source network device 232 , where the first handover request confirmation message may include first configuration information of the first target network device 234 . The second target network device 236 sends 3144 a second handover request acknowledgment message to the source network device 232 , where the second handover request acknowledgment message may include second configuration information of the second target network device 236 .
源网络设备232向终端设备210发送316RRC重配置消息，该RRC重配置消息可以包括至少一个候选小区(小区224和小区226)的切换配置信息以及切换条件。The source network device 232 sends 316 an RRC reconfiguration message to the terminal device 210, where the RRC reconfiguration message may include handover configuration information and handover conditions of at least one candidate cell (cell 224 and cell 226).
示例性地，源网络设备232可以在源网络设备232与终端设备210之间的链路质量高于某设定阈值时发送RRC重配置消息，这样能够确保终端设备210成功接收到该RRC重配置消息。候选小区的切换配置信息可以包括候选小区的标识和候选小区对应的频率信息，其中标识可以为小区全球标识符(Cell Global Identifier，CGI)或物理小区标识符(Physical Cell Identifier，PCI)等。附加地或可选地，候选小区的切换配置信息可以包括候选小区的DAPS配置信息。DAPS配置信息可以包括支持DAPS的数据无线承载(Data Radio Bearer，DRB)的指示信息，和/或，可以包括使用DAPS时在两个网络设备之间的功率信息。Exemplarily, the source network device 232 may send an RRC reconfiguration message when the link quality between the source network device 232 and the terminal device 210 is higher than a certain set threshold, so as to ensure that the terminal device 210 successfully receives the RRC reconfiguration message information. The handover configuration information of the candidate cell may include an identifier of the candidate cell and frequency information corresponding to the candidate cell, where the identifier may be a Cell Global Identifier (CGI) or a Physical Cell Identifier (Physical Cell Identifier, PCI). Additionally or alternatively, the handover configuration information of the candidate cell may include DAPS configuration information of the candidate cell. The DAPS configuration information may include indication information of a data radio bearer (Data Radio Bearer, DRB) supporting DAPS, and/or may include power information between two network devices when using DAPS.
附加地或可选地，源网络设备232还可以向终端设备210发送回退指示信息，用于指示终端设备210在发生切换失败时是否执行回退操作。该回退指示信息可以被包括在RRC重配置消息中或者该回退指示信息可以被包括在另一消息中。与回退指示信息相关的实施例可以参照下面结合图4和图5所描述的部分。本申请实施例中，回退(fall back)可以是指终端设备210在发生切换(如DAPS HO、CHO、或者DAPS+CHO)失败时，终端设备210与源网络设备232重新建立RRC连接的过程。Additionally or alternatively, the source network device 232 may also send fallback indication information to the terminal device 210, which is used to indicate whether the terminal device 210 performs a fallback operation when a handover failure occurs. The fallback indication information may be included in an RRC reconfiguration message or the fallback indication information may be included in another message. For embodiments related to rollback indication information, reference may be made to the parts described below in conjunction with FIG. 4 and FIG. 5 . In the embodiment of the present application, fallback (fall back) may refer to the process of re-establishing the RRC connection between the terminal device 210 and the source network device 232 when the terminal device 210 fails to switch (such as DAPS HO, CHO, or DAPS+CHO) .
附加地或可选地，源网络设备232还可以向终端设备210发送其他重配置消息，以将至少一个候选小区的切换配置信息告知终端设备210。Additionally or alternatively, the source network device 232 may also send other reconfiguration messages to the terminal device 210 to inform the terminal device 210 of the handover configuration information of at least one candidate cell.
终端设备210向源网络设备232发送318RRC重配置完成消息。The terminal device 210 sends 318 an RRC reconfiguration complete message to the source network device 232 .
应理解的是，图3中的302至318所在的期间可以被称为切换准备(HO preparation)期间。以下行链路(Downlink，DL)数据传输为例，在切换准备期间，已经建立了转发通路(forwarding tunnel)，具体地，建立了源网络设备232至第一目标网络设备234的转发通路以及源网络设备232至第二目标网络设备236的转发通路。It should be understood that the period from 302 to 318 in FIG. 3 may be referred to as a handover preparation (HO preparation) period. Taking downlink (Downlink, DL) data transmission as an example, during the handover preparation period, the forwarding path (forwarding tunnel) has been established, specifically, the forwarding path from the source network device 232 to the first target network device 234 and the source network device 234 have been established. A forwarding path from the network device 232 to the second target network device 236 .
附加地或可选地，如果应用早期数据转发，那么源网络设备232将早期状态转移(EARLY STATUS TRANSFER)消息发送320到第一目标网络设备234和第二目标网络设备236。可选地，还可以触发早期数据转发。以DL数据传输为例，源网络设备232可以将下行数据转发到第一目标网络设备234和第二目标网络设备236。Additionally or alternatively, if early data forwarding is applied, source network device 232 sends 320 an EARLY STATUS TRANSFER message to first target network device 234 and second target network device 236 . Optionally, early data forwarding can also be triggered. Taking DL data transmission as an example, the source network device 232 may forward the downlink data to the first target network device 234 and the second target network device 236 .
可理解的是，以下行链路数据传输为例，源网络设备232负责分配下行链路分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)序列号(Serial Number，SN)，直到SN分配被切换到第一目标网络设备234。也就是说，源网络设备232在接收到来自第一目标网络设备234的切换成功消息(如下的330)之后，才会停止分配下行链路PDCP SN。It can be understood that, taking downlink data transmission as an example, the source network device 232 is responsible for allocating a downlink packet data convergence protocol (Packet Data Convergence Protocol, PDCP) serial number (Serial Number, SN) until the SN allocation is switched to The first target network device 234 . That is to say, the source network device 232 will stop allocating the downlink PDCP SN after receiving the handover success message (330 below) from the first target network device 234.
终端设备210评估322切换条件。具体而言，终端设备210在接收到切换配置信息之后维持与源网络设备232之间的连接，并且终端设备210开始评估针对至少一个候选小区的切换条件。The terminal device 210 evaluates 322 the handover condition. Specifically, the terminal device 210 maintains the connection with the source network device 232 after receiving the handover configuration information, and the terminal device 210 starts to evaluate the handover condition for at least one candidate cell.
终端设备210选择324目标小区。具体而言，终端设备210可以通过评估切换条件确定是否存在满足切换条件的候选小区。如果存在满足切换条件的候选小区，那么终端设备210可以选择目标小区。在图3中，假设终端设备210所选择的是第一目标小区224，其中第一目标小区224属于候选小区集合。The terminal device 210 selects 324 a target cell. Specifically, the terminal device 210 may determine whether there is a candidate cell satisfying the handover condition by evaluating the handover condition. If there is a candidate cell that satisfies the handover condition, the terminal device 210 may select the target cell. In FIG. 3 , it is assumed that the terminal device 210 selects the first target cell 224, wherein the first target cell 224 belongs to the candidate cell set.
终端设备210切换326到第一目标小区224。具体而言，终端设备210可以基于先前获取的第一目标小区224的切换配置信息，而切换到第一目标小区224。The terminal device 210 is handed over 326 to the first target cell 224 . Specifically, the terminal device 210 may handover to the first target cell 224 based on the previously acquired handover configuration information of the first target cell 224 .
终端设备210向第一目标网络设备234发送328RRC重配置完成消息。The terminal device 210 sends 328 an RRC reconfiguration complete message to the first target network device 234 .
应理解的是，图3中的320至328所在的期间可以被称为切换执行(HO execution)期间。图3中的329至334所在的期间可以被称为切换完成(HO Completion)期间。It should be understood that the period from 320 to 328 in FIG. 3 may be referred to as a handover execution (HO execution) period. The period from 329 to 334 in FIG. 3 may be referred to as a handover completion (HO Completion) period.
在切换执行期间之后，终端设备210从源小区222分离(detach)329。也就是说，终端设备210可以释放与源小区222的连接。After the handover execution period, the terminal device 210 detaches 329 from the source cell 222 . That is, the terminal device 210 may release the connection with the source cell 222 .
第一目标网络设备234向源网络设备232发送330切换成功消息。该切换成功消息用于通知源网络设备232，终端设备210已经成功接入到第一目标网络设备234。从而，源网络设备232停止与终端设备210之间的数据传输。The first target network device 234 sends 330 a handover success message to the source network device 232 . The handover success message is used to notify the source network device 232 that the terminal device 210 has successfully connected to the first target network device 234 . Therefore, the source network device 232 stops data transmission with the terminal device 210 .
源网络设备232向第一目标网络设备234发送332SN状态转移消息，该SN状态转移消息可以包括由源网络设备232分配的最后一个数据传输序列号。可选地，源网络设备234还可以发起后期的数据转发。The source network device 232 sends 332 an SN state transfer message to the first target network device 234 , the SN state transfer message may include the last data transmission sequence number assigned by the source network device 232 . Optionally, the source network device 234 may also initiate later data forwarding.
源网络设备232向第二目标网络设备236发送334切换取消消息。The source network device 232 sends 334 a handover cancel message to the second target network device 236 .
这样，通过如图3所示的切换过程300，终端设备210能够成功地从源小区222切换到第一目标小区224。In this way, through the handover process 300 shown in FIG. 3 , the terminal device 210 can successfully handover from the source cell 222 to the first target cell 224 .
该过程实现了小区切换的增强，在切换过程中实现了0毫秒(或接近0毫秒)的中断时延。具体而言，在切换过程中，源网络设备232将与PDCP SN相关联的PDCP SDU发送到第一目标网络设备234，从而第一目标网络设备234也会对这些PDCP SDU进行头压缩、加密等处理。以下行传输为例，在切换过程中，源网络设备232与终端设备210之间的数据传输不中断，第一目标网络设备234和源网络设备232都会向终端设备210发送下行链路数据，从而缩短了数据传输的中断时间。在终端设备210与源网络设备232和第一目标网络设备234同时进行数据通信的过程中，终端设备210具有两套协议栈，称为DAPS，分别对应源网络设备232和第一目标网络设备234的数据通信。并且在实际场景中，某些数据无线承载(Data Radio Bearer，DRB)可以支持DAPS，其他的DRB无需进行DAPS处理，这样能够提升资源利用率。This process realizes the enhancement of cell handover, and realizes an interruption delay of 0 milliseconds (or close to 0 milliseconds) during the handover process. Specifically, during the handover process, the source network device 232 sends the PDCP SDUs associated with the PDCP SN to the first target network device 234, so that the first target network device 234 also performs header compression, encryption, etc. on these PDCP SDUs deal with. Taking downlink transmission as an example, during the handover process, the data transmission between the source network device 232 and the terminal device 210 is not interrupted, and both the first target network device 234 and the source network device 232 will send downlink data to the terminal device 210, thereby The interruption time of data transmission is shortened. During the simultaneous data communication between the terminal device 210 and the source network device 232 and the first target network device 234, the terminal device 210 has two sets of protocol stacks, called DAPS, corresponding to the source network device 232 and the first target network device 234 respectively data communication. And in actual scenarios, some data radio bearers (Data Radio Bearer, DRB) can support DAPS, and other DRBs do not need to perform DAPS processing, which can improve resource utilization.
另外，在如图1所示的切换过程100中，处于RRC连接态的终端设备101的移动性管理是由源小区的网络设备102控制的。具体的，源小区的网络设备102向终端设备101发送切换消息以指示该终端设备101切换到哪个目标小区以及如何进行切换，随后终端设备101可以基于接收到的切换消息中所包含的内容而接入目标小区。可见，在如图1所示的过程100中，切换消息的成功发送是保证该切换机制下成功切换的必要条件。然而，在LTE***或NR***中，信号质量的快速衰减、终端设备的快速移动、物体的遮挡、切换准备的持续时间较长等都会导致切换消息发送失败，进而可能会导致切换失败，降低切换成功率。另外，在 如图1所示的切换过程100中，源小区的网络设备102一般是基于终端设备101所上报的信号质量等来确定是否指示终端设备101进行切换，比如终端设备101检测到邻区的信号质量比当前服务小区的信号质量好于一定阈值时，则终端设备101上报测量结果。然而，在LTE***或NR***中，信号质量的快速衰减、终端设备的快速移动、物体的遮挡、切换准备的持续时间较长等可能会导致测量报告发送失败，进而可能会导致切换失败，降低切换成功率。In addition, in the handover process 100 shown in FIG. 1 , the mobility management of the terminal equipment 101 in the RRC connected state is controlled by the network equipment 102 of the source cell. Specifically, the network device 102 of the source cell sends a handover message to the terminal device 101 to instruct the terminal device 101 which target cell to switch to and how to perform the handover, and then the terminal device 101 can proceed based on the content contained in the received handover message. into the target area. It can be seen that in the process 100 shown in FIG. 1 , the successful sending of the handover message is a necessary condition to ensure the successful handover under the handover mechanism. However, in the LTE system or NR system, the rapid attenuation of signal quality, the rapid movement of terminal equipment, the occlusion of objects, and the long duration of handover preparation will all lead to the failure of sending handover messages, which in turn may lead to handover failure and reduce handover performance. Success rate. In addition, in the handover process 100 shown in FIG. 1 , the network device 102 of the source cell generally determines whether to instruct the terminal device 101 to perform handover based on the signal quality reported by the terminal device 101, for example, the terminal device 101 detects that a neighboring cell When the signal quality of the signal quality of the current serving cell is better than a certain threshold, the terminal device 101 reports the measurement result. However, in the LTE system or NR system, the rapid attenuation of signal quality, the rapid movement of terminal equipment, the occlusion of objects, the long duration of handover preparation, etc. may cause the failure of sending measurement reports, which in turn may lead to handover failure, reducing switching success rate.
与图1中的过程100不同，图3中所示的切换过程300是由终端设备210决定并触发的，如322至328所描述的，并且如图3中的322至328之间的切换过程对于源网络设备232而言是无感的。这样，能够充分考虑终端设备210所在的环境变化，由终端设备210触发切换，进而能够提升切换成功率。Different from the process 100 shown in FIG. 1, the handover process 300 shown in FIG. It is insensitive to the source network device 232 . In this way, the change of the environment where the terminal device 210 is located can be fully considered, and the handover is triggered by the terminal device 210, thereby improving the handover success rate.
如上所述，如图3所示的切换过程300具有DAPS+CHO的复合切换类型，能够由终端设备210触发切换过程并且该切换过程实现了最小的中断时延，从而确保了切换效率。As mentioned above, the handover process 300 shown in FIG. 3 has a composite handover type of DAPS+CHO, and the handover process can be triggered by the terminal device 210 and the handover process realizes the minimum interruption delay, thus ensuring the handover efficiency.
然而，在切换类型为DAPS+CHO的切换过程中，可能会发生切换失败。下面将结合图4至图5描述本公开的实施例中切换失败的处理方案。However, during the handover process where the handover type is DAPS+CHO, handover failure may occur. The solution for handling handover failure in the embodiment of the present disclosure will be described below with reference to FIG. 4 to FIG. 5 .
图4示出了根据本公开的一些实施例的终端设备执行小区切换的过程400的示意流程图。过程400可以由终端设备210执行。Fig. 4 shows a schematic flowchart of a process 400 for a terminal device to perform cell handover according to some embodiments of the present disclosure. The process 400 may be performed by the terminal device 210 .
在框410，终端设备210执行从源小区222到第一目标小区224的切换过程，其中第一目标小区224属于候选小区集合。At block 410, the terminal device 210 performs a handover procedure from the source cell 222 to the first target cell 224, wherein the first target cell 224 belongs to the set of candidate cells.
可选地，可以参照如图3所示的322至326来执行到第一目标小区224的切换过程。但是可理解，本公开的实施例不限于此，例如也可以采用其他的切换类型或过程等来执行从源小区222到第一目标小区224的切换。Optionally, a handover procedure to the first target cell 224 may be performed with reference to 322 to 326 as shown in FIG. 3 . However, it can be understood that the embodiments of the present disclosure are not limited thereto, for example, other handover types or procedures may also be used to perform handover from the source cell 222 to the first target cell 224 .
可理解，在410之前，终端设备210可以接收来自源网络设备232的第一切换配置消息，例如RRC重配置消息。该第一切换配置消息可以包括触发条件、候选小区集合中每个候选小区的切换配置信息。It can be understood that, before 410, the terminal device 210 may receive a first handover configuration message, such as an RRC reconfiguration message, from the source network device 232 . The first handover configuration message may include a trigger condition and handover configuration information of each candidate cell in the candidate cell set.
附加地或可选地，第一切换配置消息还可以包括回退指示信息，用于指示终端设备210在发生切换失败时是否回退到源小区。Additionally or alternatively, the first handover configuration message may further include fallback indication information, which is used to indicate whether the terminal device 210 falls back to the source cell when a handover fails.
附加地或可选地，第一切换配置消息还可以包括第一预设时间段或次数阈值。第一预设时间段或次数阈值可以用于指示终端设备210执行回退的时机，具体而言，如果超出第一预设时间段或者特定事件发生的次数达到了次数阈值，则不再执行回退。在一些实施例中，可以通过第一计时器来确定是否达到第一预设时间段，其中第一计时器的启动(或重置)时刻可以是以下任一：接收到第一切换配置消息时、开始执行切换过程时、或发生切换失败时等。在一些实施例中，可以通过计数器来确定是否达到次数阈值，其中次数阈值的启动(或重置)时刻可以是以下任一：发生切换失败时、发生回退时、回退成功时、或者触发切换时等。Additionally or alternatively, the first handover configuration message may further include a first preset time period or a times threshold. The first preset time period or the number of times threshold may be used to indicate the opportunity for the terminal device 210 to perform rollback. Specifically, if the first preset time period is exceeded or the number of occurrences of a specific event reaches the number of times threshold, no more rollback will be performed. retreat. In some embodiments, a first timer may be used to determine whether the first preset time period is reached, wherein the start (or reset) moment of the first timer may be any of the following: when the first handover configuration message is received , when the handover process is started, or when a handover failure occurs. In some embodiments, a counter can be used to determine whether the number of times threshold is reached, wherein the start (or reset) moment of the number of times threshold can be any of the following: when a handover failure occurs, when a rollback occurs, when a rollback is successful, or when a trigger Wait while switching.
附加地或可选地，第一切换配置消息还可以包括第二预设时间段。第二预设时间段可以用于指示终端设备210进行小区选择的时机，具体而言，如果超出第二预设时间段仍然没有找到合适小区，则停止进行小区选择，而进入空闲态。在一些实施例中，可以通过第二计时器来确定是否达到第二预设时间段，其中第二计时器的启动时刻可以是以下任一：接收到第一切换配置消息时、开始执行切换过程时、发生切换失败时、回退失败时等。Additionally or alternatively, the first handover configuration message may further include a second preset time period. The second preset time period may be used to indicate the opportunity for the terminal device 210 to perform cell selection. Specifically, if no suitable cell is found beyond the second preset time period, the cell selection is stopped and enters an idle state. In some embodiments, a second timer may be used to determine whether the second preset time period is reached, wherein the starting moment of the second timer may be any of the following: when the first handover configuration message is received, the handover process is started When, when a switchover fails, when a fallback fails, etc.
附加地或可选地，第一切换配置消息还可以包括第一指示信息，用于指示终端设备210在发生切换失败时是否向源网络设备232发送第一消息。Additionally or alternatively, the first handover configuration message may further include first indication information, which is used to indicate whether the terminal device 210 sends the first message to the source network device 232 when a handover failure occurs.
附加地或可选地，第一切换配置消息还可以包括其他小区的标识，用于指示终端设备210 在成功选择目标小区之后向其他小区的网络设备发送第二消息，如下面结合538所描述的。Additionally or alternatively, the first handover configuration message may also include an identifier of another cell, which is used to instruct the terminal device 210 to send a second message to the network device of the other cell after successfully selecting the target cell, as described in conjunction with 538 below .
具体而言，终端设备210可以基于第一切换配置消息，确定满足触发条件的候选小区为第一目标小区224。然后，终端设备210可以基于第一目标小区224的切换配置信息来执行到切换过程。Specifically, the terminal device 210 may determine that the candidate cell satisfying the trigger condition is the first target cell 224 based on the first handover configuration message. The terminal device 210 may then perform a handover procedure based on the handover configuration information of the first target cell 224 .
在框420，终端设备210确定在切换过程中发生切换失败。At block 420, the terminal device 210 determines that a handover failure occurs during the handover process.
切换失败可能是基于各种原因发生的，例如切换的时机过早、切换的时机过晚、或者选择了错误的小区等。Handover failure may occur based on various reasons, for example, the timing of handover is too early, the timing of handover is too late, or a wrong cell is selected.
切换的时机过早也可以称为切换过早(Too Early Handover)，终端设备在从源小区成功切换到目标小区后很短的时间(如预设时间段)内与目标小区发生了无线链路失败(Radio Link Failure，RLF)，或者终端设备在切换过程中发生了切换失败，这可能是因为终端设备执行切换过程过早，导致终端设备与目标小区的网络设备之间的连接质量较差，容易发生RLF。Too early handover can also be called too early handover (Too Early Handover). The terminal device has a wireless link with the target cell within a short time (such as a preset time period) after it is successfully handed over from the source cell to the target cell. Failure (Radio Link Failure, RLF), or the handover failure of the terminal device during the handover process, which may be because the terminal device performs the handover process too early, resulting in poor connection quality between the terminal device and the network device of the target cell, prone to RLF.
切换的时机过晚也可以被称为切换过晚(Too Late Handover)，终端设备在源小区停留了较长时间后发生了RLF，但是此时还没有开始切换，这可能是因为终端设备执行切换过程过晚。Too late handover can also be called too late handover (Too Late Handover). RLF occurs after the terminal device stays in the source cell for a long time, but the handover has not started at this time. This may be because the terminal device performs the handover The process is too late.
选择了错误的小区或导致切换到错误的小区(Handover to Wrong Cell)，终端设备210可能选择了某个小区(假设为小区A)作为目标小区，但是实际情况可能是小区B更适合，这可能会导致终端设备在从源小区切换到小区A之后很快发生RLF，或者终端设备在切换过程中发生切换失败，原因在于小区A的网络设备与终端设备之间的链路质量比较差。Selecting the wrong cell or causing handover to the wrong cell (Handover to Wrong Cell), the terminal device 210 may select a cell (assumed to be cell A) as the target cell, but the actual situation may be that cell B is more suitable, which may RLF will occur soon after the terminal device is handed over from the source cell to cell A, or the terminal device may fail to handover during the handover process, because the link quality between the network device in cell A and the terminal device is relatively poor.
附加地或可选地，终端设备210还可以基于第一指示信息，确定是否向源网络设备232发送第一消息，其中第一指示信息用于指示在发生切换失败时是否向源网络设备发送第一消息。进一步地，如果第一指示信息指示在发生切换失败时向源网络设备发送第一消息，那么终端设备210可以向源网络设备232发送第一消息。关于该第一消息可以参照下文结合图5中的529的详细描述，为了简洁，这里暂不赘述。Additionally or alternatively, the terminal device 210 may also determine whether to send the first message to the source network device 232 based on the first indication information, where the first indication information is used to indicate whether to send the first message to the source network device when a handover failure occurs. a message. Further, if the first indication information indicates to send the first message to the source network device when a handover failure occurs, the terminal device 210 may send the first message to the source network device 232 . For the first message, refer to the detailed description below in conjunction with 529 in FIG. 5 , and for the sake of brevity, details are not described here.
在框430，终端设备210确定回退指示信息，该回退指示信息至少指示在切换失败时是否回退到源小区。In block 430, the terminal device 210 determines fallback indication information, where the fallback indication information at least indicates whether to fall back to the source cell when the handover fails.
具体而言，终端设备210可以确定预先存储的回退指示信息，例如从终端设备210本地获取该回退指示信息。Specifically, the terminal device 210 may determine pre-stored rollback indication information, for example, obtain the rollback indication information locally from the terminal device 210 .
在一些实施例中，回退指示信息可以是由源网络设备232发送到终端设备210的。In some embodiments, the fallback indication information may be sent by the source network device 232 to the terminal device 210 .
在一些示例中，源网络设备232可以经由RRC重配置消息(如图3中的316)将回退指示信息发送至终端设备210，也就是说，RRC重配置消息包括回退指示信息。结合图3，举例而言，源网络设备232可以将回退指示信息发送至第一目标网络设备234，如在3102经由第一切换请求消息发送或者在其他时刻经由其他信令发送，第一目标网络设备234可以将回退指示信息包括在第一切换请求确认消息中，并在3142发送至源网络设备232，如此，源网络设备232可以在316将包括回退指示信息的RRC重配置消息发送到终端设备210。结合图3，举例而言，源网络设备232在3142接收到来自第一目标网络设备234的第一切换请求确认消息之后，可以将回退指示信息加入到其中，并在316将包括回退指示信息的RRC重配置消息发送到终端设备210。In some examples, the source network device 232 may send the fallback instruction information to the terminal device 210 via an RRC reconfiguration message (such as 316 in FIG. 3 ), that is, the RRC reconfiguration message includes the fallback instruction information. Referring to FIG. 3, for example, the source network device 232 may send the fallback indication information to the first target network device 234, such as sending via the first handover request message at 3102 or via other signaling at other times, the first target The network device 234 may include the fallback instruction information in the first handover request confirmation message, and send it to the source network device 232 at 3142, so that the source network device 232 may send the RRC reconfiguration message including the fallback instruction information at 316 to the terminal device 210. Referring to FIG. 3, for example, after the source network device 232 receives the first handover request acknowledgment message from the first target network device 234 at 3142, it may add the fallback instruction information to it, and include the fallback instruction at 316. An informational RRC reconfiguration message is sent to the terminal device 210 .
在一些示例中，源网络设备232可以经由不同于RRC重配置消息(如图3中的316)的另一消息将回退指示信息发送至终端设备210。结合图3，举例而言，源网络设备232可以在316之前或316之后将回退指示信息发送至终端设备210。在一些示例中，源网络设备232可 以通过其他的方式将回退指示信息发送至终端设备210。举例而言，源网络设备232可以通过***消息(如MIB、SIB1等)、RRC配置消息等发送回退指示信息，本公开对此不限定。可理解，本公开的实施例对携带该回退指示信息的信令不作限定，例如可以是RRC层信令、媒体接入控制(Medium Access Control，MAC)信令或物理层信令等。In some examples, the source network device 232 may send the fallback indication information to the terminal device 210 via another message different from the RRC reconfiguration message (such as 316 in FIG. 3 ). Referring to FIG. 3 , for example, the source network device 232 may send the fallback indication information to the terminal device 210 before 316 or after 316 . In some examples, the source network device 232 may send the fallback indication information to the terminal device 210 in other ways. For example, the source network device 232 may send the fallback indication information through a system message (such as MIB, SIB1, etc.), an RRC configuration message, etc., which is not limited in the present disclosure. It can be understood that the embodiments of the present disclosure do not limit the signaling carrying the fallback indication information, for example, it may be RRC layer signaling, medium access control (Medium Access Control, MAC) signaling, or physical layer signaling.
在一些实施例中，回退指示信息可以是预先配置的，例如可以是由协议预先定义的，这样能够节省信令开销。In some embodiments, the fallback indication information may be pre-configured, for example, pre-defined by a protocol, which can save signaling overhead.
在框440，当回退指示信息指示在切换失败时回退到源小区时，终端设备210执行到源小区222的回退操作。In block 440, when the fallback indication information indicates fallback to the source cell when the handover fails, the terminal device 210 performs a fallback operation to the source cell 222 .
具体而言，终端设备执行回退操作可以是指终端设备210回退到(falls back to)源小区配置并恢复与源小区222的连接。Specifically, performing the fallback operation by the terminal device may mean that the terminal device 210 falls back to (falls back to) the configuration of the source cell and restores the connection with the source cell 222.
可理解，如果终端设备210与源小区222之间的链路未发生无线链路失败(Radio Link Failure，RLF)，那么无需触发RRC连接重建立过程，可以直接使用先前的源小区配置恢复连接。但是，如果终端设备210与源小区222之间的链路已经被释放了，那么可能会导致无法恢复连接，也就是说可能会发生回退失败。下面将结合图5描述终端设备210基于回退指示信息的后续操作的示例实施例。图5示出了根据本公开的一些实施例的在发生切换失败之后终端设备执行的过程500的示意流程图。It can be understood that if there is no radio link failure (Radio Link Failure, RLF) in the link between the terminal device 210 and the source cell 222, then there is no need to trigger the RRC connection re-establishment process, and the previous source cell configuration can be used directly to restore the connection. However, if the link between the terminal device 210 and the source cell 222 has been released, the connection may not be restored, that is to say, fallback failure may occur. An example embodiment of subsequent operations of the terminal device 210 based on the fallback indication information will be described below with reference to FIG. 5 . Fig. 5 shows a schematic flowchart of a process 500 performed by a terminal device after a handover failure occurs according to some embodiments of the present disclosure.
在框510，终端设备210确定回退指示信息是否指示在切换失败时回退到源小区。如果是，则执行520。如果否，则执行530。In block 510, the terminal device 210 determines whether the fallback indication information indicates fallback to the source cell when the handover fails. If yes, go to step 520 . If not, go to step 530 .
在框520，终端设备210确定是否满足回退条件。如果是，则执行522。如果否，则执行530。At block 520, the terminal device 210 determines whether a fallback condition is met. If yes, go to 522. If not, go to step 530 .
示例性地，回退条件可以包括经过的时间低于第一预设时间段或者发生特定事件的次数低于次数阈值。举例而言，经过的时间低于第一预设时间段可以包括以下任一：从接收到第一切换配置消息开始经过的时间低于第一预设时间段、从开始执行切换过程时经过的时间低于第一预设时间段、或者从发生切换失败开始经过的二十件低于第一预设时间段。在一些实施例中，可以通过第一计时器来确定是否达到第一预设时间段，其中第一计时器的启动时刻可以是以下任一：接收到第一切换配置消息时、开始执行切换过程时、发生切换失败时等。举例而言，发生特定事件的次数低于次数阈值可以包括以下任一：发生切换失败的次数低于次数阈值、发生回退的次数低于次数阈值、回退成功的次数低于次数阈值、或者触发切换的次数低于次数阈值。在一些实施例中，可以通过计数器来确定是否达到次数阈值，其中次数阈值的启动(或重置)时刻可以是以下任一：发生切换失败时、发生回退时、回退成功时、或者触发切换时等。Exemplarily, the fallback condition may include that the elapsed time is lower than a first preset time period or the number of occurrences of a specific event is lower than a threshold value. For example, the elapsed time being lower than the first preset time period may include any of the following: the elapsed time since receiving the first handover configuration message is lower than the first preset time period, the elapsed time since the start of the handover process The time is lower than the first preset time period, or the 20 cases elapsed since the switching failure occurs are lower than the first preset time period. In some embodiments, the first timer can be used to determine whether the first preset time period is reached, wherein the start time of the first timer can be any of the following: when the first handover configuration message is received, the handover process is started , when switching failure occurs, etc. For example, the number of occurrences of a specific event is lower than the number threshold may include any of the following: the number of handover failures is lower than the number threshold, the number of rollbacks is lower than the number threshold, the number of rollback successes is lower than the number threshold, or The number of trigger switching is lower than the number threshold. In some embodiments, a counter can be used to determine whether the number of times threshold is reached, wherein the start (or reset) moment of the number of times threshold can be any of the following: when a handover failure occurs, when a rollback occurs, when a rollback is successful, or when a trigger Wait while switching.
换句话说，如果经过的时间达到第一预设时间段或者发生特定事件的次数达到次数阈值，则不再执行回退。第一预设时间段和/或次数阈值可以是协议预先规定的或预配置的，或者可以是源网络设备232通过高层信令配置的，或者可以是源网络设备232通过RRC重配置消息发送到终端设备210的，或者可以是源网络设备232通过其他的信令发送到终端设备210的，本公开的实施例对此不限定。在一些实施例中，第一预设时间段和/或次数阈值可以被包括在回退指示信息中。在一些实施例中，第一预设时间段和/或次数阈值可以独立于回退指示信息，被包括在另一信令中。In other words, if the elapsed time reaches the first preset time period or the number of occurrences of a specific event reaches the number threshold, no more rollback is performed. The first preset time period and/or the number of thresholds may be predetermined or pre-configured by the protocol, or may be configured by the source network device 232 through high-layer signaling, or may be sent by the source network device 232 through an RRC reconfiguration message to The terminal device 210, or may be sent to the terminal device 210 by the source network device 232 through other signaling, which is not limited in this embodiment of the present disclosure. In some embodiments, the first preset time period and/or the times threshold may be included in the rollback indication information. In some embodiments, the first preset time period and/or the times threshold may be included in another signaling independently of the backoff indication information.
在框522，终端设备210执行回退操作。也就是说，终端设备210回退到源小区配置。At block 522, the terminal device 210 performs a fallback operation. That is, the terminal device 210 falls back to the source cell configuration.
应注意，尽管图5中示出了先执行520再在520确定“是”的分支之后执行522，但是 本公开不限于此。作为另一例，也可以先执行522再执行520，并且在520确定“是”的分支之后执行524。这里不再罗列。It should be noted that although FIG. 5 shows that 520 is performed first and then 522 is performed after the "yes" branch of 520 is determined, the present disclosure is not limited thereto. As another example, 522 may be executed first and then 520 may be executed, and 524 may be executed after the "yes" branch is determined at 520 . No longer listed here.
在框524，终端设备210确定是否回退成功。如果是，则执行526。如果否，则执行530。In block 524, the terminal device 210 determines whether the rollback is successful. If yes, go to 526. If not, go to step 530 .
回退成功可以是指，终端设备210成功回退到源小区配置并与源小区恢复连接(resume the connection with source cell)。The rollback success may refer to that the terminal device 210 successfully rolls back to the configuration of the source cell and resumes the connection with the source cell (resume the connection with source cell).
在框526，终端设备210维持在源小区。也就是说，终端设备210继续与源网络设备232进行通信。At block 526, the terminal device 210 remains in the source cell. That is, the terminal device 210 continues to communicate with the source network device 232 .
可理解的是，在526之后，终端设备210还可以重新执行小区切换过程。在一些实施例中，终端设备210可以仍然基于第一切换配置消息执行小区切换。例如重新执行如图4所示的410至440。在一些实施例中，终端设备210可以接收来自源网络设备232的第二切换配置消息，并基于第二切换配置消息执行小区切换，类似于如图4所示的410至440。第二切换配置消息可以包括新触发条件以及新候选小区集合中每个新候选小区集合的切换配置信息。第二切换配置消息中的新触发条件与第一切换配置消息中的触发条件可以相同也可以不同。第二切换配置消息中所指示的新候选小区集合与第一切换配置消息中所指示的候选小区集合可以完全不同、部分相同或者全部相同。本公开对此不限定。It can be understood that, after 526, the terminal device 210 may also re-execute the cell switching process. In some embodiments, the terminal device 210 may still perform cell handover based on the first handover configuration message. For example, re-execute 410 to 440 as shown in FIG. 4 . In some embodiments, the terminal device 210 may receive the second handover configuration message from the source network device 232, and perform cell handover based on the second handover configuration message, similar to 410 to 440 shown in FIG. 4 . The second handover configuration message may include a new trigger condition and handover configuration information of each new candidate cell set in the new candidate cell set. The new trigger condition in the second handover configuration message may be the same as or different from the trigger condition in the first handover configuration message. The new set of candidate cells indicated in the second handover configuration message and the set of candidate cells indicated in the first handover configuration message may be completely different, partly the same or all the same. This disclosure is not limited thereto.
附加地或可选地，在522之后，还可以执行528。Additionally or alternatively, after 522 , 528 may also be performed.
在框528，终端设备210确定第一指示信息是否指示在发生切换失败时向源网络设备232发送第一消息。如果第一指示信息指示在发生切换失败时向源网络设备232发送第一消息，则执行529。In block 528, the terminal device 210 determines whether the first indication information indicates to send a first message to the source network device 232 when a handover failure occurs. If the first indication information indicates to send the first message to the source network device 232 when a handover failure occurs, go to step 529 .
示例性地，第一指示信息可以是协议预先规定的或预配置的，或者可以是源网络设备232通过高层信令配置的，或者可以是源网络设备232通过RRC重配置消息发送到终端设备210的，或者可以是源网络设备232通过其他的信令发送到终端设备210的，本公开的实施例对此不限定。Exemplarily, the first indication information may be pre-specified or pre-configured by the protocol, or may be configured by the source network device 232 through high-level signaling, or may be sent by the source network device 232 to the terminal device 210 through an RRC reconfiguration message or may be sent by the source network device 232 to the terminal device 210 through other signaling, which is not limited in this embodiment of the present disclosure.
可选地，回退指示信息和第一指示信息可以被包括在同一信令中。可选地，第一指示信息还可以进一步指示第一消息所包括的信息。Optionally, the fallback indication information and the first indication information may be included in the same signaling. Optionally, the first indication information may further indicate information included in the first message.
在框529，终端设备210向源网络设备232发送第一消息。At block 529 , the terminal device 210 sends the first message to the source network device 232 .
可选地，可以在确定终端设备210与源网络设备232之间的链路可用时，发送该第一消息。可选地，第一消息可以直接地经由终端设备210与源网络设备232之间的链路而被发送到源网络设备232。Optionally, the first message may be sent when it is determined that the link between the terminal device 210 and the source network device 232 is available. Alternatively, the first message may be sent to the source network device 232 directly via the link between the terminal device 210 and the source network device 232 .
可选地，第一消息可以被间接地发送到源网络设备232。举例而言，终端设备210可以将第一消息发送至另一网络设备，并由另一网络设备将该第一消息转发至源网络设备232。例如，在终端设备210与源网络设备232之间的链路已经释放的情况下，终端设备210所执行的到源小区222的回退操作会导致回退失败，此时可以经由另一网络设备向源网络设备232发送第一消息。Alternatively, the first message may be sent to source network device 232 indirectly. For example, the terminal device 210 may send the first message to another network device, and the other network device forwards the first message to the source network device 232 . For example, when the link between the terminal device 210 and the source network device 232 has been released, the fallback operation performed by the terminal device 210 to the source cell 222 will cause the fallback to fail. A first message is sent to source network device 232 .
该第一消息可以指示以下中的一项或多项：第一预设时间段或次数阈值、切换类型、发生切换失败的次数、发生切换失败时的时间、从发起切换过程到发生切换失败之间的第一时长、在发生切换失败时针对第一目标小区的第一测量信息、在发生切换失败时针对源小区的第二测量信息、在发生切换失败时针对候选小区集合中其他候选小区的第三测量信息、是否执行回退、回退成功的次数、回退成功时的时间、回退成功时针对第一目标小区的第四测量信息、回退成功时针对源小区的第五测量信息、回退成功时针对其他候选小区的第六测量信 息、从发生切换失败到回退成功之间的第二时长、是否回退失败、回退失败时的时间、回退失败时针对第一目标小区的第七测量信息、回退失败时针对源小区的第八测量信息、回退失败时针对候选小区集合中其他候选小区的第九测量信息、从发生切换失败到回退失败之间的第三时长等。The first message may indicate one or more of the following: a first preset time period or times threshold, handover type, number of handover failures, time when handover failures occur, time from initiation of handover process to occurrence of handover failures The first time length between, the first measurement information for the first target cell when the handover failure occurs, the second measurement information for the source cell when the handover failure occurs, and the other candidate cells in the candidate cell set when the handover failure occurs The third measurement information, whether to perform fallback, the number of successful fallbacks, the time when the fallback is successful, the fourth measurement information for the first target cell when the fallback is successful, and the fifth measurement information for the source cell when the fallback is successful , the sixth measurement information for other candidate cells when the fallback is successful, the second time period from the handover failure to the fallback success, whether the fallback fails, the time when the fallback fails, and the first target when the fallback fails The seventh measurement information of the cell, the eighth measurement information for the source cell when the fallback fails, the ninth measurement information for other candidate cells in the candidate cell set when the fallback fails, and the eighth measurement information from the handover failure to the fallback failure Wait for three hours.
可选地，切换类型可以为DAPS+CHO。其他候选小区可以是指候选小区集合中除第一目标小区之外的其他候选小区。Optionally, the switching type may be DAPS+CHO. Other candidate cells may refer to other candidate cells in the candidate cell set except the first target cell.
可理解，终端设备210在回退成功之后可能会再次执行小区切换，并且还可能再次发生切换失败。发生切换失败的次数可以是指从接收到第一切换配置消息之后，发生切换失败的次数。发生切换失败时的时间可以包括：第一次发生切换失败时的时间、最后一次(距离当前最近一次)发生切换失败时的时间、或每次发生切换失败时的时间。第一消息所指示的第一时长可以包括：从基于第一切换配置消息发起切换过程开始到任一次(或每一次或最后一次)发生切换失败之间的时长。另外，从发起切换过程到发生切换失败之间的第一时长可以被表示为：从发起切换过程到第一次发生切换失败之间的时长，和/或，相邻两次发生切换失败之间的时长等。It can be understood that the terminal device 210 may perform cell handover again after the fallback is successful, and handover failure may also occur again. The number of handover failure occurrences may refer to the number of handover failure occurrences after the first handover configuration message is received. The time when the handover failure occurs may include: the time when the handover failure occurs for the first time, the time when the handover failure occurs for the last time (the time closest to the present), or the time when each handover failure occurs. The first duration indicated by the first message may include: a duration from when a handover process is initiated based on the first handover configuration message to when a handover failure occurs any time (or every time or the last time). In addition, the first period of time between the initiation of the handover process and the occurrence of the handover failure may be expressed as: the time period between the initiation of the handover process and the first occurrence of the handover failure, and/or, the period between two adjacent handover failures the duration of waiting.
可选地，第一测量信息、第二测量信息和第三测量信息可以分别包括每次发生切换失败时的测量结果，或者可以包括最后一次发生切换失败时的测量结果。Optionally, the first measurement information, the second measurement information and the third measurement information may respectively include the measurement results when handover failure occurs each time, or may include the measurement results when handover failure occurs last time.
可选地，第一消息所指示的回退成功的次数可以是指在第一预设时间段内回退成功的次数，或者可以是指在接收到第一切换配置消息之后回退成功的次数。回退成功的时间可以包括：第一次回退成功时的时间、最后一次(距离当前最近一次)回退成功时的时间、或每次回退成功时的时间。第四测量信息、第五测量信息和第六测量信息可以分别包括每次回退成功时的测量结果，或者可以包括最后一次回退成功时的测量结果。Optionally, the number of successful rollbacks indicated by the first message may refer to the number of successful rollbacks within the first preset time period, or may refer to the number of successful rollbacks after receiving the first handover configuration message . The time when rollback is successful may include: the time when rollback is successful for the first time, the time when rollback is successful for the last time (closest to the current one), or the time when rollback is successful every time. The fourth measurement information, the fifth measurement information, and the sixth measurement information may respectively include the measurement result of each successful rollback, or may include the measurement result of the last successful rollback.
可选地，第二时长可以包括：从第一次发生切换失败到第一次回退成功之间的时长、从第一次发生切换失败到最后一次回退成功之间的时长、从最后一次发生切换失败到最后一次回退成功之间的时长、或从每一次发生切换失败到其后最邻近的一次回退成功之间的时长等。可选地，第二时长还可以进一步指示相邻两次回退成功之间的时长等。Optionally, the second duration may include: the duration from the first handover failure to the first rollback success, the time from the first handover failure to the last rollback success, and the time period from the last rollback The time period between the handover failure and the last rollback success, or the time period between each handover failure and the nearest subsequent rollback success, etc. Optionally, the second duration may further indicate the duration between two adjacent rollback successes.
可选地，第三时长可以包括：从第一次发生切换失败到回退失败之间的时长、或从最后一次发生切换失败到回退失败之间的时长等。Optionally, the third duration may include: the duration from the first occurrence of the handover failure to the rollback failure, or the duration from the last occurrence of the handover failure to the rollback failure, and the like.
附加地或可选地，第一消息还可以指示触发切换的次数、触发切换的时间等。Additionally or alternatively, the first message may also indicate the number of times the handover is triggered, the time when the handover is triggered, and the like.
附加地或者可选地，第一消息还可以指示在回退成功(如最后一次或每一次)时针对源小区的至少一个邻区的测量信息，和/或，在回退失败时针对源小区的至少一个邻区的测量信息。Additionally or optionally, the first message may also indicate the measurement information of at least one neighbor cell of the source cell when the fallback is successful (for example, the last time or every time), and/or, the measurement information of the source cell when the fallback fails Measurement information of at least one neighboring cell of .
附加地或者可选地，第一消息还可以指示在回退成功时(如最后一次或每一次)针对源小区所指示的小区的测量信息，和/或，在回退失败时针对源小区所指示的小区的测量信息。举例而言，源网络设备232可以预先通过信令向终端设备210通知所指示的小区的标识，该信令可以是RRC重配置消息或者可以是其他的消息，本公开对此不限定。那么，终端设备210可以基于所指示的小区的标识，对所指示的小区进行测量得到测量信息，并将所指示的小区的测量信息通过第一消息进行指示。Additionally or optionally, the first message may also indicate the measurement information of the cell indicated for the source cell when the fallback is successful (such as the last time or every time), and/or, the measurement information for the source cell when the fallback fails Measurement information of the indicated cell. For example, the source network device 232 may notify the terminal device 210 of the indicated cell identifier through signaling in advance, and the signaling may be an RRC reconfiguration message or other messages, which is not limited in the present disclosure. Then, the terminal device 210 may measure the indicated cell to obtain measurement information based on the identifier of the indicated cell, and indicate the measurement information of the indicated cell through the first message.
本公开实施例中的测量信息可以是针对测量对象进行测量得到的测量结果，其中测量对象可以是同步信号或参考信号等，例如包括以下一项或多项：信道状态信息参考信号(Channel State Information-Reference Signal，CSI-RS)、同步信号和物理广播信道块(Synchronization  Signal and Physical Broadcast Channel Block，SSB)等。测量结果可以是波束级别的或者小区级别的测量结果，例如包括以下一项或多项：参考信号接收功率(Reference Signal Received Power，RSRP)、参考信号接收质量(Reference Signal Received Quality，RSRQ)、信噪比(Signal to Interference plus Noise Ratio，SINR)、接收信号强度指示(Received Signal Strength Indication，RSSI)等。The measurement information in the embodiments of the present disclosure may be a measurement result obtained by measuring a measurement object, where the measurement object may be a synchronization signal or a reference signal, for example, including one or more of the following: Channel State Information Reference Signal (Channel State Information -Reference Signal, CSI-RS), synchronization signal and physical broadcast channel block (Synchronization Signal and Physical Broadcast Channel Block, SSB), etc. The measurement results can be beam-level or cell-level measurement results, for example, including one or more of the following: Reference Signal Received Power (Reference Signal Received Power, RSRP), Reference Signal Received Quality (Reference Signal Received Quality, RSRQ), signal Signal to Interference plus Noise Ratio (SINR), Received Signal Strength Indication (RSSI), etc.
可选地，第一消息可以被承载在切换失败(HO failure)报告中，或者，第一消息可以是独立于切换失败报告的另一消息，本公开对此不限定。Optionally, the first message may be carried in a handover failure (HO failure) report, or the first message may be another message independent of the handover failure report, which is not limited in the present disclosure.
在框530，终端设备210执行小区选择。具体而言，该过程也可以被称为小区重选，终端设备210可以确定是否存在满足触发条件的小区。At block 530, the terminal device 210 performs cell selection. Specifically, this process may also be called cell reselection, and the terminal device 210 may determine whether there is a cell satisfying the trigger condition.
在框540，终端设备210确定在第二预设时间段内是否无法找到合适小区。In block 540, the terminal device 210 determines whether a suitable cell cannot be found within a second preset time period.
在一些实施例中，第二预设时间段可以是从源网络设备232接收到的。例如，第二预设时间段可以被包括在第一切换配置消息中，以指示进行小区选择的时机。再例如，第二预设时间段可以被包括在其他的信令或消息中。在一些实施例中，第二预设时间段可以是由协议预先定义的，或者可以是预配置的，本公开对此不限定。In some embodiments, the second preset time period may be received from the source network device 232 . For example, the second preset time period may be included in the first handover configuration message to indicate the timing of cell selection. For another example, the second preset time period may be included in other signaling or messages. In some embodiments, the second preset time period may be predefined by a protocol, or may be preconfigured, which is not limited in the present disclosure.
在一些实施例中，终端设备210可以使用第二计时器来确定是否达到第二预设时间段，其中第二计时器的启动时刻可以是以下任一：接收到第一切换配置消息时、开始执行切换过程时、发生切换失败时、或回退失败时等。In some embodiments, the terminal device 210 may use the second timer to determine whether the second preset time period is reached, where the start time of the second timer may be any of the following: when receiving the first handover configuration message, starting When performing the switchover process, when a switchover fails, or when a rollback fails, etc.
具体地，可以确定在第二预设时间段内是否能够找到满足触发条件的小区。如果在第二预设时间段内无法找到合适小区，则执行532。如果在第二预设时间段内找到了合适小区，则继续进行到533。Specifically, it may be determined whether a cell meeting the trigger condition can be found within the second preset time period. If no suitable cell can be found within the second preset time period, go to 532 . If a suitable cell is found within the second preset time period, proceed to 533 .
在框532，终端设备210进入空闲态。具体而言，如果终端设备210在第二预设时间段内无法找到合适小区，则进入空闲态，避免长时间进行小区选择，这样能够节省终端设备210的能耗。At block 532, the terminal device 210 enters an idle state. Specifically, if the terminal device 210 cannot find a suitable cell within the second preset time period, it enters an idle state to avoid cell selection for a long time, which can save energy consumption of the terminal device 210 .
在框533，终端设备210确定所选择的小区是否是候选小区。At block 533, the terminal device 210 determines whether the selected cell is a candidate cell.
具体的，可以确定在530执行小区选择所确定的新小区是否属于候选小区集合。如前所述，源网络设备232已经将候选小区集合中每个候选小区的切换配置信息发送至该终端设备210。Specifically, it may be determined whether the new cell determined by performing cell selection at 530 belongs to the candidate cell set. As mentioned above, the source network device 232 has sent the handover configuration information of each candidate cell in the candidate cell set to the terminal device 210 .
作为一例，假设新小区为第二目标小区226，其属于候选小区集合，那么执行535。相反，假设新小区为第三目标小区，其不属于候选小区集合，则执行534。As an example, assuming that the new cell is the second target cell 226, which belongs to the candidate cell set, then 535 is executed. On the contrary, assuming that the new cell is the third target cell, which does not belong to the set of candidate cells, go to 534 .
在框534，终端设备210执行RRC重建立。并且随后可以执行535。At block 534, the terminal device 210 performs RRC re-establishment. And then 535 can be executed.
可选地，作为另一种实现，在531确定“否”分支之后可以执行534，并随后执行535。也就是说，可以不执行533。Optionally, as another implementation, 534 may be executed after the "no" branch is determined at 531, and then 535 may be executed. That is to say, 533 may not be executed.
在框535，终端设备210执行小区切换。具体地，终端设备210从源小区切换到新小区，如第二目标小区226或第三目标小区。At block 535, the terminal device 210 performs a cell handover. Specifically, the terminal device 210 switches from the source cell to a new cell, such as the second target cell 226 or the third target cell.
在框536，终端设备210确定是否切换失败。如果确定切换失败，可以返回执行510。如果确定切换成功，则执行537。At block 536, the terminal device 210 determines whether the handover failed. If it is determined that the handover fails, return to execution 510 . If it is determined that the handover is successful, go to step 537.
在框537，终端设备210驻留在新小区。具体地，参照图3，在切换成功之后，可以向新小区的网络设备(如第二目标网络设备236或者第三目标小区的网络设备)发送RRC重配置完成消息。可选地，还可以从源小区分离(detach from the source cell)。At block 537, the terminal device 210 camps on the new cell. Specifically, referring to FIG. 3 , after the handover is successful, an RRC reconfiguration complete message may be sent to the network device of the new cell (such as the second target network device 236 or the network device of the third target cell). Optionally, it can also be detached from the source cell (detach from the source cell).
附加地或可选地，如果在536确定切换成功，还可以执行538。Additionally or alternatively, if it is determined at 536 that the handover is successful, 538 may also be performed.
在框538，终端设备210发送第二消息。At block 538, the terminal device 210 sends the second message.
在一些实施例中，终端设备210可以向源网络设备232发送第二消息。举例而言，终端设备210可以在从源小区分离之前向源网络设备232发送第二消息。或者，终端设备210可以向另一网络设备发送第二消息，并由该另一网络设备将该第二消息转发至源网络设备232。In some embodiments, end device 210 may send the second message to source network device 232 . For example, the terminal device 210 may send the second message to the source network device 232 before detaching from the source cell. Alternatively, the terminal device 210 may send the second message to another network device, and the other network device forwards the second message to the source network device 232 .
在一些示例中，另一网络设备可以是新小区的网络设备，也就是说，终端设备210可以将第二消息直接或间接地发送到新小区的网络设备，从而新小区的网络设备可以将第二消息直接或间接地转发至源网络设备232。例如，假设新小区的网络设备为第二目标网络设备236，终端设备210可以将第二消息发送至该第二目标网络设备236。可选地，第二消息可以被包括在终端设备210发送至新小区的网络设备的RRC重配置完成消息中。在此之后，第二目标网络设备236可以将第二消息转发至源网络设备232。可选地，第二目标网络设备236可以将第二消息与切换完成消息合并为一个消息发送到源网络设备232。In some examples, another network device may be a network device of the new cell, that is, the terminal device 210 may directly or indirectly send the second message to the network device of the new cell, so that the network device of the new cell may send the second message to the network device of the new cell. The second message is forwarded to source network device 232 directly or indirectly. For example, assuming that the network device of the new cell is the second target network device 236 , the terminal device 210 may send the second message to the second target network device 236 . Optionally, the second message may be included in the RRC reconfiguration complete message sent by the terminal device 210 to the network device of the new cell. After that, the second destination network device 236 may forward the second message to the source network device 232 . Optionally, the second target network device 236 may combine the second message and the handover completion message into one message and send it to the source network device 232 .
在一些示例中，另一网络设备可以是源网络设备232所发送的第一切换配置消息所指示的。例如，第一切换配置消息可以包括其他小区的标识。从而终端设备210可以基于该其他小区的标识确定其他小区的网络设备，并且终端设备210可以将第二消息直接或间接地发送到该标识所指示的其他小区的网络设备，从而该其他小区的网络设备可以将第二消息直接或间接地转发至源网络设备232。In some examples, the other network device may be indicated by the first handover configuration message sent by source network device 232 . For example, the first handover configuration message may include identities of other cells. Therefore, the terminal device 210 can determine the network device of the other cell based on the identifier of the other cell, and the terminal device 210 can directly or indirectly send the second message to the network device of the other cell indicated by the identifier, so that the network device of the other cell The device may forward the second message to source network device 232 directly or indirectly.
该第二消息可以指示以下中的一项或多项：第一预设时间段或次数阈值、切换类型、发生切换失败的次数、发生切换失败时的时间、从发起切换过程到发生切换失败之间的第一时长、在发生切换失败时针对第一目标小区的第一测量信息、在发生切换失败时针对源小区的第二测量信息、在发生切换失败时针对其他候选小区的第三测量信息、是否执行回退、回退成功的次数、回退成功时的时间、回退成功时针对第一目标小区的第四测量信息、回退成功时针对源小区的第五测量信息、回退成功时针对候选小区集合中其他候选小区的第六测量信息、从发生切换失败到回退成功之间的第二时长、是否回退失败、回退失败时的时间、回退失败时针对第一目标小区的第七测量信息、回退失败时针对源小区的第八测量信息、回退失败时针对候选小区集合中其他候选小区的第九测量信息、从发生切换失败到回退失败之间的第三时长、从回退失败到成功选择第二目标小区之间的第四时长；或从发生切换失败到成功选择第二目标小区之间的第五时长等。The second message may indicate one or more of the following: first preset time period or times threshold, handover type, number of times handover failure occurs, time when handover failure occurs, time from initiation of handover process to occurrence of handover failure The first time length between, the first measurement information for the first target cell when handover failure occurs, the second measurement information for the source cell when handover failure occurs, and the third measurement information for other candidate cells when handover failure occurs , Whether to perform fallback, the number of successful fallbacks, the time when the fallback is successful, the fourth measurement information for the first target cell when the fallback is successful, the fifth measurement information for the source cell when the fallback is successful, and the success of the fallback The sixth measurement information of other candidate cells in the candidate cell set, the second time period from the occurrence of handover failure to the fallback success, whether the fallback failed, the time when the fallback failed, and the first target when the fallback failed The seventh measurement information of the cell, the eighth measurement information for the source cell when the fallback fails, the ninth measurement information for other candidate cells in the candidate cell set when the fallback fails, and the eighth measurement information from the handover failure to the fallback failure Three durations, the fourth duration from fallback failure to successful selection of the second target cell; or the fifth duration from handover failure to successful selection of the second target cell, etc.
可选地，切换类型可以为DAPS+CHO。其他候选小区可以是指候选小区集合中除第一目标小区之外的其他候选小区。Optionally, the switching type may be DAPS+CHO. Other candidate cells may refer to other candidate cells in the candidate cell set except the first target cell.
可理解，终端设备210在回退成功之后可能会再次执行小区切换，并且还可能再次发生切换失败。发生切换失败的次数可以是指从接收到第一切换配置消息之后，发生切换失败的次数。发生切换失败时的时间可以包括：第一次发生切换失败时的时间、最后一次(距离当前最近一次)发生切换失败时的时间、或每次发生切换失败时的时间。第一时长可以包括：从基于第一切换配置消息发起切换过程开始到任一次(或每一次或最后一次)发生切换失败之间的时长。另外，从发起切换过程到发生切换失败之间的第一时长可以被表示为：从发起切换过程到第一次发生切换失败之间的时长，和/或，相邻两次发生切换失败之间的时长等。It can be understood that the terminal device 210 may perform cell handover again after the fallback is successful, and handover failure may also occur again. The number of handover failure occurrences may refer to the number of handover failure occurrences after the first handover configuration message is received. The time when the handover failure occurs may include: the time when the handover failure occurs for the first time, the time when the handover failure occurs for the last time (the time closest to the present), or the time when each handover failure occurs. The first duration may include: a duration from when a handover process is initiated based on the first handover configuration message to when a handover failure occurs any time (or every time or the last time). In addition, the first period of time between the initiation of the handover process and the occurrence of the handover failure may be expressed as: the time period between the initiation of the handover process and the first occurrence of the handover failure, and/or, the period between two adjacent handover failures the duration of waiting.
可选地，第一测量信息、第二测量信息和第三测量信息可以分别包括每次发生切换失败时的测量结果，或者可以包括最后一次发生切换失败时的测量结果。Optionally, the first measurement information, the second measurement information and the third measurement information may respectively include the measurement results when handover failure occurs each time, or may include the measurement results when handover failure occurs last time.
可选地，回退成功的次数可以是指在第一预设时间段内回退成功的次数，或者可以是指在接收到第一切换配置消息之后回退成功的次数。回退成功的时间可以包括：第一次回退成 功时的时间、最后一次(距离当前最近一次)回退成功时的时间、或每次回退成功时的时间。第四测量信息、第五测量信息和第六测量信息可以分别包括每次回退成功时的测量结果，或者可以包括最后一次回退成功时的测量结果。Optionally, the number of successful rollbacks may refer to the number of successful rollbacks within the first preset time period, or may refer to the number of successful rollbacks after receiving the first handover configuration message. The time when rollback is successful may include: the time when rollback is successful for the first time, the time when rollback is successful for the last time (the closest to the current one), or the time when rollback is successful every time. The fourth measurement information, the fifth measurement information, and the sixth measurement information may respectively include the measurement result of each successful rollback, or may include the measurement result of the last successful rollback.
可选地，第二时长可以包括：从第一次发生切换失败到第一次回退成功之间的时长、从第一次发生切换失败到最后一次回退成功之间的时长、从最后一次发生切换失败到最后一次回退成功之间的时长、或从每一次发生切换失败到其后最邻近的一次回退成功之间的时长等。可选地，第二时长还可以进一步指示相邻两次回退成功之间的时长等。Optionally, the second duration may include: the duration from the first handover failure to the first rollback success, the time from the first handover failure to the last rollback success, and the time period from the last rollback The time period between the handover failure and the last rollback success, or the time period between each handover failure and the nearest subsequent rollback success, etc. Optionally, the second duration may further indicate the duration between two adjacent rollback successes.
可选地，第三时长可以包括：从第一次发生切换失败到回退失败之间的时长、或从最后一次发生切换失败到回退失败之间的时长等。Optionally, the third duration may include: the duration from the first occurrence of the handover failure to the rollback failure, or the duration from the last occurrence of the handover failure to the rollback failure, and the like.
可选地，第五时长可以包括：从第一次发生切换失败到成功选择第二目标小区之间的时长、从最后一次发生切换失败到成功选择第二目标小区之间的时长、每一次发生切换失败到成功选择第二目标小区之间的时长等。另外，示例性地，第五时长也可以表示为从发生切换失败开始到选择到合适小区为止之间的时长等。另外，示例性地，第五时长可以被间接地指示，例如可以通过第三时长与第四时长之和来指示第五时长。Optionally, the fifth duration may include: the duration from the first occurrence of handover failure to the successful selection of the second target cell, the duration from the last occurrence of handover failure to the successful selection of the second target cell, each occurrence of The time period between the handover failure and the successful selection of the second target cell, etc. In addition, for example, the fifth duration may also be expressed as a duration from when a handover failure occurs to when a suitable cell is selected. In addition, for example, the fifth duration may be indicated indirectly, for example, the fifth duration may be indicated by the sum of the third duration and the fourth duration.
附加地或可选地，第二消息还可以指示触发切换的次数、触发切换的时间等。Additionally or alternatively, the second message may also indicate the number of times the handover is triggered, the time when the handover is triggered, and the like.
附加地或者可选地，第二消息还可以指示在回退成功(如最后一次或每一次)时针对源小区的至少一个邻区的测量信息，和/或，在回退失败时针对源小区的至少一个邻区的测量信息。Additionally or optionally, the second message may also indicate the measurement information of at least one neighbor cell of the source cell when the fallback is successful (such as the last time or every time), and/or, the source cell when the fallback fails Measurement information of at least one neighboring cell of .
附加地或者可选地，第二消息还可以指示在回退成功(如最后一次或每一次)时针对源小区所指示的小区的测量信息，和/或，在回退失败时针对源小区所指示的小区的测量信息。举例而言，源网络设备232可以预先通过信令向终端设备210通知所指示的小区的标识，该信令可以是RRC重配置消息或者可以是其他的消息，本公开对此不限定。那么，终端设备210可以基于所指示的小区的标识，对所指示的小区进行测量得到测量信息，并将所指示的小区的测量信息通过第二消息进行指示。Additionally or optionally, the second message may also indicate the measurement information of the cell indicated for the source cell when the fallback is successful (such as the last time or every time), and/or, the measurement information for the source cell when the fallback fails Measurement information of the indicated cell. For example, the source network device 232 may notify the terminal device 210 of the indicated cell identifier through signaling in advance, and the signaling may be an RRC reconfiguration message or other messages, which is not limited in the present disclosure. Then, the terminal device 210 may measure the indicated cell to obtain measurement information based on the identifier of the indicated cell, and indicate the measurement information of the indicated cell through the second message.
测量信息可以是针对测量对象进行测量得到的测量结果，其中测量对象可以是同步信号或参考信号等，例如包括以下一项或多项：CSI-RS、SSB等。测量结果可以是波束级别的或者小区级别的测量结果，例如包括以下一项或多项：RSRP、RSRQ、SINR、RSSI等。The measurement information may be a measurement result obtained by measuring a measurement object, where the measurement object may be a synchronization signal or a reference signal, for example, including one or more of the following: CSI-RS, SSB, and the like. The measurement results may be beam-level or cell-level measurement results, for example, including one or more of the following: RSRP, RSRQ, SINR, RSSI and so on.
另外，第一消息或第二消息所指示的切换类型可以为混合切换类型，或者也可以称为DAPS+CHO。或者，该切换类型可以是基于回退指示信息的切换。但是应注意的是，本公开不限于此，例如切换类型可以为DAPS切换，或者切换类型可以为CHO，或者切换类型可以为其他类型，这里不再罗列。In addition, the handover type indicated by the first message or the second message may be a hybrid handover type, or may also be called DAPS+CHO. Alternatively, the handover type may be handover based on fallback indication information. However, it should be noted that the present disclosure is not limited thereto. For example, the handover type may be DAPS handover, or the handover type may be CHO, or the handover type may be other types, which will not be listed here.
如此，本公开的实施例中终端设备在发生切换失败时，可以基于回退指示信息确定是回退到源小区还是重新执行小区选择，这样能够明确终端设备的处理流程，保证了切换的效率。In this way, in the embodiments of the present disclosure, when a handover failure occurs, the terminal device can determine whether to fall back to the source cell or re-perform cell selection based on the fallback indication information, so that the processing flow of the terminal device can be clarified, and the efficiency of the handover can be ensured.
图6示出了根据本公开的一些实施例的用于小区切换的过程600的示意流程图。过程600可以由网络设备执行，例如图2所示的网络设备232等。Fig. 6 shows a schematic flowchart of a process 600 for cell handover according to some embodiments of the present disclosure. The process 600 may be executed by a network device, such as the network device 232 shown in FIG. 2 .
在框610，网络设备232向终端设备210发送回退指示信息，该回退指示信息至少指示在切换失败时是否回退到源小区222，该网络设备232为终端设备210执行切换过程时的源小区的网络设备。In block 610, the network device 232 sends fallback instruction information to the terminal device 210, the fallback instruction information at least indicates whether to fall back to the source cell 222 when the handover fails, and the network device 232 is the source cell 222 when the terminal device 210 performs the handover process The network equipment of the community.
可选地，回退指示信息可以被包括在RRC重配置消息中，或者回退指示信息可以被包括在其他消息中。本公开的实施例对回退指示信息的发送时机不作限定，例如可以在***信息 中指示、可以在RRC信令中指示、可以在随机接入响应中指示、或者可以在切换配置消息中指示等等。Optionally, the fallback indication information may be included in the RRC reconfiguration message, or the fallback indication information may be included in other messages. The embodiments of the present disclosure do not limit the sending timing of the fallback indication information, for example, it may be indicated in the system information, it may be indicated in the RRC signaling, it may be indicated in the random access response, or it may be indicated in the handover configuration message, etc. wait.
附加地或可选地，网络设备232还可以向终端设备210发送第一切换配置消息，该第一切换配置消息可以包括触发条件以及候选小区集合中每个候选小区的切换配置信息，其中触发条件至少用于终端设备确定第一目标小区。在一些实施例中，第一切换配置消息可以被实现为RRC重配置消息。Additionally or alternatively, the network device 232 may also send a first handover configuration message to the terminal device 210, and the first handover configuration message may include a trigger condition and handover configuration information of each candidate cell in the candidate cell set, wherein the trigger condition At least for the terminal equipment to determine the first target cell. In some embodiments, the first handover configuration message may be implemented as an RRC reconfiguration message.
在框620，当终端设备210在切换过程中发生切换失败且回退指示信息指示在切换失败时回退到源小区时，网络设备232基于终端设备210的回退操作而执行与终端设备210进行连接的操作。In block 620, when the handover failure of the terminal device 210 occurs during the handover process and the fallback indication information indicates that the fallback to the source cell occurs when the handover fails, the network device 232 executes the communication with the terminal device 210 based on the fallback operation of the terminal device 210. The operation of the connection.
当回退指示信息指示在切换失败时回退到源小区时，结合图2，假如终端设备210从小区222到小区224的切换过程发生了切换失败，那么终端设备210执行到小区222的回退操作，那么网络设备232可以与终端设备210恢复连接。When the fallback indication information indicates fallback to the source cell when the handover fails, in conjunction with FIG. 2 , if the handover failure occurs in the handover process of the terminal device 210 from the cell 222 to the cell 224, then the terminal device 210 performs a fallback to the cell 222 operation, then the network device 232 can restore the connection with the terminal device 210 .
附加地或可选地，在框630，网络设备232接收来自终端设备210的切换报告消息。该切换报告消息可以指示以下至少一项：第一预设时间段或次数阈值；切换过程的切换类型；发生切换失败的次数；发生切换失败时的时间；从发起切换过程到发生切换失败之间的第一时长；在发生切换失败时针对切换过程所切换至的第一目标小区的第一测量信息；在发生切换失败时针对源小区的第二测量信息；在发生切换失败时针对候选小区集合中的其他候选小区的第三测量信息；是否执行回退；回退成功的次数；回退成功时的时间；回退成功时针对第一目标小区的第四测量信息；回退成功时针对源小区的第五测量信息；回退成功时针对其他候选小区的第六测量信息；从发生切换失败到回退成功之间的第二时长；是否回退失败；回退失败时的时间；回退失败时针对第一目标小区的第七测量信息；回退失败时针对源小区的第八测量信息；回退失败时针对候选小区集合中的其他候选小区的第九测量信息；从发生切换失败到回退失败之间的第三时长；从回退失败到成功选择新的驻留小区之间的第四时长；或从发生切换失败到成功选择新的驻留小区之间的第五时长等。Additionally or alternatively, at block 630 the network device 232 receives a handover report message from the terminal device 210 . The handover report message may indicate at least one of the following: a first preset time period or a number of thresholds; the handover type of the handover process; the number of handover failures; the time when the handover failure occurs; The first duration of the handover; when the handover fails, the first measurement information for the first target cell to which the handover process is handed over; when the handover fails, the second measurement information for the source cell; when the handover fails, for the set of candidate cells The third measurement information of the other candidate cells in the cell; whether to perform rollback; the number of successful rollbacks; the time when the rollback is successful; the fourth measurement information for the first target cell when the rollback is successful; The fifth measurement information of the cell; the sixth measurement information for other candidate cells when the fallback is successful; the second duration from the handover failure to the fallback success; whether the fallback fails; the time when the fallback fails; fallback The seventh measurement information for the first target cell when the failure occurs; the eighth measurement information for the source cell when the fallback fails; the ninth measurement information for other candidate cells in the candidate cell set when the fallback fails; from handover failure to The third time period between rollback failures; the fourth time period between rollback failure and successful selection of a new resident cell; or the fifth time period from handover failure to successful selection of a new resident cell, etc.
该切换报告消息可以为上述实施例中的第一消息或第二消息，该切换报告消息可以被实现为切换失败报告或切换成功报告，本公开对此不限定。The handover report message may be the first message or the second message in the foregoing embodiments, and the handover report message may be implemented as a handover failure report or a handover success report, which is not limited in the present disclosure.
本公开的实施例中，网络设备232还可以进一步地基于第一消息来调整或更新切换配置，例如可以确定第二切换配置消息。举例而言，如果终端设备210成功回退，那么网络设备232还可以向回退成功的终端设备210发送第二切换配置消息，从而终端设备210可以基于第二切换配置消息重新执行切换过程，这样能够提高切换的成功率。举例而言，如果终端设备210回退失败，那么网络设备232可以向其他的待切换的终端设备发送第二切换配置消息，这样能够减少其他的待切换的终端设备在小区切换过程中发生切换失败的概率。In the embodiment of the present disclosure, the network device 232 may further adjust or update the handover configuration based on the first message, for example, may determine the second handover configuration message. For example, if the terminal device 210 rolls back successfully, the network device 232 may also send a second handover configuration message to the terminal device 210 that rolls back successfully, so that the terminal device 210 can re-execute the handover process based on the second handover configuration message, so that The success rate of switching can be improved. For example, if the terminal device 210 fails to fall back, the network device 232 may send a second handover configuration message to other terminal devices to be handed over, which can reduce handover failures of other terminal devices to be handed over during the cell handover process. The probability.
本公开的实施例对网络设备232调整或更新切换配置的具体方式不作限定。举例而言，如果消息中所指示的第三时长较短(低于预设的第一时长阈值，如2秒或其他值)，那么网络设备232可以确定终端设备210在切换时与源小区的链路质量过差，或者可以确定终端设备210在切换时与目标小区的链路质量较好。可选地，网络设备232可以确定终端设备210不适宜回退到源小区，或者网络设备232可以确定终端设备210上一次选择了错误的目标小区。可选地，网络设备232可以向终端设备210发送新的回退指示信息，指示终端设备210在切换失败时不回退。可选地，网络设备232可以向终端设备210发送第二切换配置信息，其指示其他的候选小区集合。举例而言，如果消息所指示的第三时长较长(超过预设的第二时长 阈值，如5秒或其他值)，那么网络设备232可以确定上一次切换失败可能是由于切换配置不合理导致的过早切换。Embodiments of the present disclosure do not limit the specific manner in which the network device 232 adjusts or updates the switching configuration. For example, if the third duration indicated in the message is shorter (lower than the preset first duration threshold, such as 2 seconds or other values), then the network device 232 may determine that the terminal device 210 is connected to the source cell during handover. The link quality is too bad, or it can be determined that the link quality between the terminal device 210 and the target cell is relatively good during handover. Optionally, the network device 232 may determine that the terminal device 210 is not suitable to fall back to the source cell, or the network device 232 may determine that the terminal device 210 selected a wrong target cell last time. Optionally, the network device 232 may send new fallback indication information to the terminal device 210, instructing the terminal device 210 not to fall back when the handover fails. Optionally, the network device 232 may send the second handover configuration information to the terminal device 210, which indicates other candidate cell sets. For example, if the third duration indicated by the message is longer (exceeds the preset second duration threshold, such as 5 seconds or other values), then the network device 232 may determine that the last handover failure may be caused by unreasonable handover configuration premature switching.
可理解的是，关于回退指示信息、第一消息、第二消息等可以参见上述结合图3至图5的实施例，为了简洁，此处不再重复。It can be understood that, for the rollback indication information, the first message, the second message, etc., reference may be made to the foregoing embodiments in conjunction with FIG. 3 to FIG. 5 , which are not repeated here for brevity.
由此可见，本公开的实施例中网络设备可以基于终端设备所报告的关于切换过程中的各种信息的指示来调整移动性参数，这样能够提升终端设备进行切换的成功率，减少切换失败的发生。It can be seen that in the embodiments of the present disclosure, the network device can adjust the mobility parameters based on the indications of various information in the handover process reported by the terminal device, which can improve the handover success rate of the terminal device and reduce the handover failure rate. occur.
应理解，在本公开的实施例中，“第一”，“第二”，“第三”等只是为了表示多个对象可能是不同的，但是同时不排除两个对象之间是相同的。“第一”，“第二”，“第三”等不应当解释为对本公开实施例的任何限制。It should be understood that in the embodiments of the present disclosure, "first", "second", "third" and so on are only used to indicate that multiple objects may be different, but it does not exclude that two objects are the same. "First", "second", "third" and so on should not be construed as any limitations on the embodiments of the present disclosure.
还应理解，本公开的实施例中的方式、情况、类别以及实施例的划分仅是为了描述的方便，不应构成特别的限定，各种方式、类别、情况以及实施例中的特征在符合逻辑的情况下，可以相互结合。It should also be understood that the divisions of methods, situations, categories and embodiments in the embodiments of the present disclosure are only for the convenience of description, and should not constitute special limitations. Logical cases can be combined with each other.
还应理解，上述内容只是为了帮助本领域技术人员更好地理解本公开的实施例，而不是要限制本公开的实施例的范围。本领域技术人员根据上述内容，可以进行各种修改或变化或组合等。这样的修改、变化或组合后的方案也在本公开的实施例的范围内。It should also be understood that the above content is only to help those skilled in the art better understand the embodiments of the present disclosure, rather than limiting the scope of the embodiments of the present disclosure. Those skilled in the art may make various modifications or changes or combinations based on the above contents. Such modifications, changes or combined solutions are also within the scope of the embodiments of the present disclosure.
还应理解，上述内容的描述着重于强调各个实施例之前的不同之处，相同或相似之处可以互相参考或借鉴，为了简洁，这里不再赘述。It should also be understood that the above description focuses on the differences between the various embodiments, and the same or similar points may refer to or learn from each other, and for the sake of brevity, details are not repeated here.
图7示出了根据本公开的一些实施例的用于小区切换的通信装置700的一个示意框图。装置700可以被实现为终端设备210或者被实现为终端设备210的一部分(如芯片)等，本公开对此不限定。Fig. 7 shows a schematic block diagram of a communication device 700 for cell handover according to some embodiments of the present disclosure. The apparatus 700 may be implemented as the terminal device 210 or as a part of the terminal device 210 (such as a chip), etc., which is not limited in the present disclosure.
如图7所示，装置700可以包括切换模块710、第一确定模块720、第二确定模块730以及回退模块740。另外可选地，装置700还可以进一步包括小区选择模块750、重建立模块760、转换模块770和发送模块780。As shown in FIG. 7 , the apparatus 700 may include a switching module 710 , a first determining module 720 , a second determining module 730 and a fallback module 740 . Optionally, the apparatus 700 may further include a cell selection module 750 , a re-establishment module 760 , a conversion module 770 and a sending module 780 .
切换模块710被配置为执行从源小区到第一目标小区的切换过程，第一目标小区属于候选小区集合。第一确定模块720被配置为确定在切换过程中发生切换失败。第二确定模块730被配置为确定回退指示信息，回退指示信息至少指示在切换失败时是否回退到源小区。回退模块740被配置为当回退指示信息指示在切换失败时回退到源小区时，执行到源小区的回退操作。The handover module 710 is configured to perform a handover procedure from a source cell to a first target cell, the first target cell belonging to the set of candidate cells. The first determination module 720 is configured to determine that a handover failure occurs during the handover process. The second determination module 730 is configured to determine fallback indication information, where the fallback indication information at least indicates whether to fall back to the source cell when the handover fails. The fallback module 740 is configured to perform a fallback operation to the source cell when the fallback indication information indicates to fallback to the source cell when the handover fails.
示例性地，小区选择模块750可以被配置为当从发起切换过程开始经过的时间达到第一预设时间段时或者当发生切换失败的次数达到次数阈值时，执行小区选择过程。示例性地，小区选择模块750可以被配置为当经过的时间达到第一预设时间段或者发生特定事件的次数达到次数阈值时，终端设备执行小区选择过程，其中第一预设时间段的起始时刻可以是接收到第一切换配置消息时、开始执行切换过程时、或者发生切换失败时；其中特定事件可以是发生切换失败时、发生回退时、回退成功时、或者触发切换时。Exemplarily, the cell selection module 750 may be configured to execute the cell selection process when the elapsed time from initiating the handover process reaches a first preset time period or when the number of handover failures reaches a number threshold. Exemplarily, the cell selection module 750 may be configured to execute a cell selection process on the terminal device when the elapsed time reaches a first preset time period or the number of occurrences of a specific event reaches a number threshold, wherein the first preset time period starts from The starting moment may be when the first handover configuration message is received, when the handover process is started, or when handover failure occurs; where the specific event may be when handover failure occurs, when rollback occurs, when rollback succeeds, or when handover is triggered.
或者示例性地，小区选择模块750可以被配置为当确定回退操作失败时，执行小区选择过程。或者示例性地，小区选择模块750可以被配置为当回退指示信息指示在切换失败时不回退到源小区时，执行小区选择过程。Or for example, the cell selection module 750 may be configured to execute a cell selection process when it is determined that the rollback operation fails. Or as an example, the cell selection module 750 may be configured to perform a cell selection process when the fallback indication information indicates not to fallback to the source cell when the handover fails.
在一些实施例中，发送模块780可以被配置为向源小区的网络设备发送第一消息，第一消息指示以下至少一项：第一预设时间段或次数阈值；切换过程的切换类型；发生切换失败 的次数；发生切换失败时的时间；从发起切换过程到发生切换失败之间的第一时长；在发生切换失败时针对第一目标小区的第一测量信息；在发生切换失败时针对源小区的第二测量信息；在发生切换失败时针对候选小区集合中的其他候选小区的第三测量信息；是否执行回退；回退成功的次数；回退成功时的时间；每次回退成功时针对第一目标小区的第四测量信息；每次回退成功时针对源小区的第五测量信息；每次回退成功时针对其他候选小区的第六测量信息；从发生切换失败到回退成功之间的第二时长；是否回退失败；回退失败时的时间；回退失败时针对第一目标小区的第七测量信息；回退失败时针对源小区的第八测量信息；回退失败时针对候选小区集合中的其他候选小区的第九测量信息；或从发生切换失败到回退失败之间的第三时长。In some embodiments, the sending module 780 may be configured to send a first message to the network device of the source cell, and the first message indicates at least one of the following: a first preset time period or a threshold of times; a handover type of the handover process; occurrence The number of handover failures; the time when handover failure occurs; the first time period from the initiation of the handover process to the occurrence of handover failure; the first measurement information for the first target cell when handover failure occurs; The second measurement information of the cell; the third measurement information for other candidate cells in the candidate cell set when handover failure occurs; whether to perform rollback; the number of successful rollbacks; the time when the rollback is successful; each time the rollback is successful The fourth measurement information for the first target cell; the fifth measurement information for the source cell every time the fallback is successful; the sixth measurement information for other candidate cells every time the fallback is successful; the period between handover failure and fallback success Whether the fallback fails; the time when the fallback fails; the seventh measurement information for the first target cell when the fallback fails; the eighth measurement information for the source cell when the fallback fails; Ninth measurement information of other candidate cells in the candidate cell set; or a third time period between occurrence of handover failure and fallback failure.
可选地，切换模块710还可以被配置为当小区选择过程选择了候选小区集合中的第二目标小区时，执行到第二目标小区的切换过程。重建立模块760可以被配置为当小区选择过程选择了不属于候选小区集合的第二目标小区时，执行与第二目标小区的RRC重建立过程。或者可选地，重建立模块760可以被配置为当小区选择过程选择了第二目标小区时，执行与第二目标小区的RRC重建立过程。Optionally, the handover module 710 may also be configured to perform a handover process to the second target cell when the second target cell in the candidate cell set is selected by the cell selection process. The re-establishment module 760 may be configured to perform an RRC re-establishment process with the second target cell when the cell selection process selects a second target cell that does not belong to the candidate cell set. Or optionally, the re-establishment module 760 may be configured to perform an RRC re-establishment process with the second target cell when the second target cell is selected by the cell selection process.
转换模块770可以被配置为当在第二预设时间段内无法找到合适小区时，转换到空闲态。The switching module 770 may be configured to switch to an idle state when no suitable cell can be found within a second preset time period.
在一些实施例中，发送模块780可以被配置为当小区选择过程选择了第二目标小区且成功切换到第二目标小区时，发送第二消息。该第二消息指示以下至少一项：第一预设时间段或次数阈值；切换过程的切换类型；发生切换失败的次数；发生切换失败时的时间；从发起切换过程到发生切换失败之间的第一时长；在发生切换失败时针对第一目标小区的第一测量信息；在发生切换失败时针对源小区的第二测量信息；在发生切换失败时针对候选小区集合中的其他候选小区的第三测量信息；是否执行回退；回退成功的次数；回退成功时的时间；回退成功时针对第一目标小区的第四测量信息；回退成功时针对源小区的第五测量信息；回退成功时针对候选小区集合中的其他候选小区的第六测量信息；从发生切换失败到回退成功之间的第二时长；是否回退失败；回退失败时的时间；回退失败时针对第一目标小区的第七测量信息；回退失败时针对源小区的第八测量信息；回退失败时针对候选小区集合中的其他候选小区的第九测量信息；从发生切换失败到回退失败之间的第三时长；从回退失败到成功选择第二目标小区之间的第四时长；或从发生切换失败到成功选择第二目标小区之间的第五时长。In some embodiments, the sending module 780 may be configured to send the second message when the second target cell is selected in the cell selection process and the handover to the second target cell is successful. The second message indicates at least one of the following: a first preset time period or a threshold value of times; the handover type of the handover process; the number of times handover failures occur; the time when handover failures occur; The first duration; the first measurement information for the first target cell when handover failure occurs; the second measurement information for the source cell when handover failure occurs; the second measurement information for other candidate cells in the candidate cell set when handover failure occurs 3. Measurement information; whether to perform rollback; the number of successful rollbacks; the time when the rollback is successful; the fourth measurement information for the first target cell when the rollback is successful; the fifth measurement information for the source cell when the rollback is successful; The sixth measurement information for other candidate cells in the candidate cell set when the rollback is successful; the second time period from the occurrence of handover failure to the rollback success; whether the rollback fails; the time when the rollback fails; when the rollback fails The seventh measurement information for the first target cell; the eighth measurement information for the source cell when the fallback fails; the ninth measurement information for other candidate cells in the candidate cell set when the fallback fails; from handover failure to fallback The third time period between failures; the fourth time period between rollback failure and successful selection of the second target cell; or the fifth time period between handover failure and successful selection of the second target cell.
可理解，本公开的实施例中对模块或单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时也可以有另外的划分方式，另外，在公开的实施例中的各功能单元可以集成在一个单元中，也可以是单独物理存在，也可以两个或两个以上单元集成为一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。It can be understood that the division of modules or units in the embodiments of the present disclosure is schematic, and is only a division of logical functions. In actual implementation, there may also be other division methods. In addition, each function in the disclosed embodiments Units can be integrated into one unit, or physically exist separately, or two or more units can be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.
图7中的装置700能够用于实现上述实施例中由终端设备210所述的各个过程，为了简洁，这里不再赘述。The apparatus 700 in FIG. 7 can be used to implement each process described by the terminal device 210 in the foregoing embodiment, and for the sake of brevity, details are not repeated here.
图8示出了根据本公开的一些实施例的用于小区切换的通信装置800的一个示意框图。装置800可以被实现为网络设备232或者被实现为网络设备232的一部分(如芯片)等，本公开对此不限定。Fig. 8 shows a schematic block diagram of a communication device 800 for cell handover according to some embodiments of the present disclosure. The apparatus 800 may be implemented as the network device 232 or as a part of the network device 232 (such as a chip), etc., which is not limited in the present disclosure.
如图8所示，装置800包括发送模块810、连接模块820和接收模块830。发送模块810被配置为向终端设备发送回退指示信息，回退指示信息至少指示在切换失败时是否回退到源小区，通信装置800为终端设备执行切换过程时的源小区的网络设备。连接模块820被配置 为当终端设备在切换过程中发生切换失败且回退指示信息指示在切换失败时回退到源小区时，基于终端设备的回退操作而执行与终端设备进行连接的操作。As shown in FIG. 8 , the device 800 includes a sending module 810 , a connecting module 820 and a receiving module 830 . The sending module 810 is configured to send fallback instruction information to the terminal device, the fallback instruction information at least indicates whether to fall back to the source cell when the handover fails, and the communication device 800 is the network device of the source cell when the terminal device performs the handover process. The connection module 820 is configured to perform an operation of connecting with the terminal device based on the fallback operation of the terminal device when the terminal device fails to handover during the handover process and the fallback indication information indicates that the terminal device falls back to the source cell when the handover fails.
可选地，发送模块810还可以被配置为向终端设备发送切换配置消息，该切换配置消息可以包括触发条件以及候选小区集合中每个候选小区的切换配置信息，其中触发条件至少用于终端设备确定第一目标小区。Optionally, the sending module 810 may also be configured to send a handover configuration message to the terminal device, where the handover configuration message may include a trigger condition and handover configuration information of each candidate cell in the candidate cell set, where the trigger condition is at least for the terminal device Determine the first target cell.
在一些实施例中，接收模块830可以被配置为接收来自终端设备的切换报告消息，该切换报告消息指示以下至少一项：第一预设时间段或次数阈值；切换过程的切换类型；发生切换失败的次数；发生切换失败时的时间；从发起切换过程到发生切换失败之间的第一时长；在发生切换失败时针对切换过程所切换至的第一目标小区的第一测量信息；在发生切换失败时针对源小区的第二测量信息；在发生切换失败时针对候选小区集合中的其他候选小区的第三测量信息；是否执行回退；回退成功的次数；回退成功时的时间；回退成功时针对第一目标小区的第四测量信息；回退成功时针对源小区的第五测量信息；回退成功时针对其他候选小区的第六测量信息；从发生切换失败到回退成功之间的第二时长；是否回退失败；回退失败时的时间；回退失败时针对第一目标小区的第七测量信息；回退失败时针对源小区的第八测量信息；回退失败时针对候选小区集合中的其他候选小区的第九测量信息；从发生切换失败到回退失败之间的第三时长；从回退失败到成功选择所驻留的小区之间的第四时长；或从发生切换失败到成功选择所驻留的小区之间的第五时长。In some embodiments, the receiving module 830 may be configured to receive a handover report message from the terminal device, the handover report message indicating at least one of the following: a first preset time period or a threshold of times; a handover type of the handover process; handover occurs The number of times of failure; the time when the handover failure occurs; the first duration from the initiation of the handover process to the occurrence of the handover failure; the first measurement information for the first target cell to which the handover process is handed over when the handover failure occurs; The second measurement information for the source cell when the handover fails; the third measurement information for other candidate cells in the candidate cell set when the handover fails; whether to perform rollback; the number of successful rollbacks; the time when the rollback is successful; The fourth measurement information for the first target cell when the rollback is successful; the fifth measurement information for the source cell when the rollback is successful; the sixth measurement information for other candidate cells when the rollback is successful; from handover failure to rollback success The second duration between; whether the rollback fails; the time when the rollback fails; the seventh measurement information for the first target cell when the rollback fails; the eighth measurement information for the source cell when the rollback fails; the rollback fails The ninth measurement information for other candidate cells in the candidate cell set; the third time period from the occurrence of handover failure to the fallback failure; the fourth time length from the fallback failure to the successful selection of the cell in which to reside; Or the fifth time period between when the handover fails to successfully select the cell to reside on.
可理解，本公开的实施例中对模块或单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时也可以有另外的划分方式，另外，在公开的实施例中的各功能单元可以集成在一个单元中，也可以是单独物理存在，也可以两个或两个以上单元集成为一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。It can be understood that the division of modules or units in the embodiments of the present disclosure is schematic, and is only a logical function division, and there may be other division methods in actual implementation. In addition, each function in the disclosed embodiments Units can be integrated into one unit, or physically exist separately, or two or more units can be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.
图8中的装置800能够用于实现上述实施例中由网络设备232所述的各个过程，为了简洁，这里不再赘述。The apparatus 800 in FIG. 8 can be used to implement various processes described by the network device 232 in the foregoing embodiments, and details are not described here for brevity.
图9示出了可以用来实施本公开的实施例的示例设备900的示意性框图。设备900可以被实现为或者被包括在图2的终端设备210中，或者设备900可以被实现为或者被包括在图2的网络设备232中。如图所示，设备900包括一个或多个处理器910，耦合到处理器910的一个或多个存储器920，以及耦合到处理器910的通信模块940。FIG. 9 shows a schematic block diagram of an example device 900 that may be used to implement embodiments of the present disclosure. Device 900 may be implemented as or included in terminal device 210 of FIG. 2 , or device 900 may be implemented as or included in network device 232 of FIG. 2 . As shown, device 900 includes one or more processors 910 , one or more memories 920 coupled to processors 910 , and a communication module 940 coupled to processors 910 .
通信模块940可以用于双向通信。通信模块940可以具有用于通信的至少一个通信接口。通信接口可以包括与其他设备通信所必需的任何接口。The communication module 940 can be used for two-way communication. The communication module 940 may have at least one communication interface for communication. Communication interfaces may include any interface necessary to communicate with other devices.
处理器910可以是适合于本地技术网络的任何类型，并且可以包括但不限于以下至少一种：通用计算机、专用计算机、微控制器、数字信号处理器(Digital Signal Processor，DSP)、或基于控制器的多核控制器架构中的一个或多个。设备900可以具有多个处理器，例如专用集成电路芯片，其在时间上从属于与主处理器同步的时钟。The processor 910 may be of any type suitable for the local technical network, and may include, but is not limited to, at least one of the following: a general-purpose computer, a special-purpose computer, a microcontroller, a digital signal processor (Digital Signal Processor, DSP), or a control-based One or more of the multi-core controller architectures of the processor. Device 900 may have multiple processors, such as application specific integrated circuit chips, that are time slaved to a clock that is synchronized to a main processor.
存储器920可以包括一个或多个非易失性存储器和一个或多个易失性存储器。非易失性存储器的示例包括但不限于以下至少一种：只读存储器(Read-Only Memory，ROM)924、可擦除可编程只读存储器(Erasable Programmable Read Only Memory，EPROM)、闪存、硬盘、光盘(Compact Disc，CD)、数字视频盘(Digital Versatile Disc，DVD)或其他磁存储和/或光存储。易失性存储器的示例包括但不限于以下至少一种：随机存取存储器(Random Access Memory，RAM)922、或不会在断电持续时间中持续的其他易失性存储器。 Memory 920 may include one or more non-volatile memories and one or more volatile memories. Examples of non-volatile memory include but are not limited to at least one of the following: read-only memory (Read-Only Memory, ROM) 924, erasable programmable read-only memory (Erasable Programmable Read Only Memory, EPROM), flash memory, hard disk , Compact Disc (CD), Digital Video Disk (Digital Versatile Disc, DVD) or other magnetic and/or optical storage. Examples of volatile memory include, but are not limited to, at least one of: Random Access Memory (RAM) 922, or other volatile memory that does not persist for the duration of a power outage.
计算机程序930包括由关联处理器910执行的计算机可执行指令。程序930可以存储在 ROM 924中。处理器910可以通过将程序930加载到RAM 922中来执行任何合适的动作和处理。The computer program 930 comprises computer-executable instructions executed by the associated processor 910 . Program 930 can be stored in ROM 924. Processor 910 may perform any suitable actions and processes by loading program 930 into RAM 922.
可以借助于程序930来实现本公开的实施例，使得设备900可以执行如参考图4至图6所讨论的任何过程。本公开的实施例还可以通过硬件或通过软件和硬件的组合来实现。Embodiments of the present disclosure may be implemented by means of a program 930 such that the device 900 may perform any of the processes as discussed with reference to FIGS. 4 to 6 . Embodiments of the present disclosure can also be realized by hardware or by a combination of software and hardware.
程序930可以有形地包含在计算机可读介质中，该计算机可读介质可以包括在设备900中(诸如在存储器920中)或者可以由设备900访问的其他存储设备。可以将程序930从计算机可读介质加载到RAM 922以供执行。计算机可读介质可以包括任何类型的有形非易失性存储器，例如ROM、EPROM、闪存、硬盘、CD、DVD等。 Program 930 may be tangibly embodied on a computer readable medium, which may be included in device 900 (such as in memory 920 ) or other storage device accessible by device 900 . Program 930 may be loaded from a computer readable medium into RAM 922 for execution. The computer readable medium may include any type of tangible nonvolatile memory such as ROM, EPROM, flash memory, hard disk, CD, DVD, and the like.
在一些实施例中，设备900中的通信模块940可以被实现为发送器和接收器(或收发器)，其可以被配置为发送/接收诸如切换配置消息、回退指示信息、第一消息、第二消息等。另外，设备900还可以进一步包括调度器、控制器、射频/天线中的一个或多个，本公开不再详细阐述。In some embodiments, the communication module 940 in the device 900 can be implemented as a transmitter and a receiver (or transceiver), which can be configured to send/receive information such as handover configuration messages, fallback indication information, first messages, Second message etc. In addition, the device 900 may further include one or more of a scheduler, a controller, and a radio frequency/antenna, which will not be described in detail in this disclosure.
示例性地，图9中的设备900可以被实现为通信装置，或者可以被实现为通信装置中的芯片或芯片***，本公开的实施例对此不限定。Exemplarily, the device 900 in FIG. 9 may be implemented as a communication device, or may be implemented as a chip or chip system in the communication device, which is not limited by the embodiments of the present disclosure.
本公开的实施例还提供了一种芯片，该芯片可以包括输入接口、输出接口和处理电路。在本公开的实施例中，可以由输入接口和输出接口完成信令或数据的交互，由处理电路完成信令或数据信息的生成以及处理。Embodiments of the present disclosure also provide a chip, which may include an input interface, an output interface, and a processing circuit. In the embodiments of the present disclosure, the interaction of signaling or data may be completed by the input interface and the output interface, and the generation and processing of signaling or data information may be completed by the processing circuit.
本公开的实施例还提供了一种芯片***，包括处理器，用于支持设备以实现上述任一实施例中所涉及的功能。在一种可能的设计中，芯片***还可以包括存储器，用于存储必要的程序指令和数据，当处理器运行该程序指令时，使得安装该芯片***的设备实现上述任一实施例中所涉及的方法。示例性地，该芯片***可以由一个或多个芯片构成，也可以包含芯片和其他分立器件。Embodiments of the present disclosure also provide a chip system, including a processor, configured to support a device to implement the functions involved in any of the foregoing embodiments. In a possible design, the system-on-a-chip may further include a memory for storing necessary program instructions and data, and when the processor runs the program instructions, the device installed with the system-on-a-chip can implement the program described in any of the above-mentioned embodiments. Methods. Exemplarily, the chip system may consist of one or more chips, and may also include chips and other discrete devices.
本公开的实施例还提供了一种处理器，用于与存储器耦合，存储器存储有指令，当处理器运行所述指令时，使得处理器执行上述任一实施例中涉及的方法和功能。Embodiments of the present disclosure further provide a processor, configured to be coupled with a memory, where instructions are stored in the memory, and when the processor executes the instructions, the processor executes the methods and functions involved in any of the foregoing embodiments.
本公开的实施例还提供了一种包含指令的计算机程序产品，其在计算机上运行时，使得计算机执行上述各实施例中任一实施例中涉及的方法和功能。Embodiments of the present disclosure also provide a computer program product containing instructions, which, when run on a computer, cause the computer to execute the methods and functions involved in any of the above embodiments.
本公开的实施例还提供了一种计算机可读存储介质，其上存储有计算机指令，当处理器运行所述指令时，使得处理器执行上述任一实施例中涉及的方法和功能。Embodiments of the present disclosure also provide a computer-readable storage medium, on which computer instructions are stored, and when a processor executes the instructions, the processor is made to execute the methods and functions involved in any of the above embodiments.
通常，本公开的各种实施例可以以硬件或专用电路、软件、逻辑或其任何组合来实现。一些方面可以用硬件实现，而其他方面可以用固件或软件实现，其可以由控制器，微处理器或其他设备执行。虽然本公开的实施例的各个方面被示出并描述为框图，流程图或使用一些其他图示表示，但是应当理解，本文描述的框，装置、***、技术或方法可以实现为，如非限制性示例，硬件、软件、固件、专用电路或逻辑、通用硬件或控制器或其他设备，或其某种组合。In general, the various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software, which may be executed by a controller, microprocessor or other device. While various aspects of the embodiments of the present disclosure are shown and described as block diagrams, flowcharts, or using some other pictorial representation, it should be understood that the blocks, devices, systems, techniques or methods described herein can be implemented as, without limitation, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controllers or other devices, or some combination thereof.
本公开还提供有形地存储在非暂时性计算机可读存储介质上的至少一个计算机程序产品。该计算机程序产品包括计算机可执行指令，例如包括在程序模块中的指令，其在目标的真实或虚拟处理器上的设备中执行，以执行如上参考附图的过程/方法。通常，程序模块包括执行特定任务或实现特定抽象数据类型的例程、程序、库、对象、类、组件、数据结构等。在各种实施例中，可以根据需要在程序模块之间组合或分割程序模块的功能。用于程序模块的机器可执行指令可以在本地或分布式设备内执行。在分布式设备中，程序模块可以位于本地和 远程存储介质中。The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product comprises computer-executable instructions, eg included in program modules, which are executed in a device on a real or virtual processor of a target to perform the process/method as above with reference to the accompanying drawings. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. In various embodiments, the functionality of the program modules may be combined or divided as desired among the program modules. Machine-executable instructions for program modules may be executed within local or distributed devices. In a distributed device, program modules may be located in both local and remote storage media.
用于实现本公开的方法的计算机程序代码可以用一种或多种编程语言编写。这些计算机程序代码可以提供给通用计算机、专用计算机或其他可编程的数据处理装置的处理器，使得程序代码在被计算机或其他可编程的数据处理装置执行的时候，引起在流程图和/或框图中规定的功能/操作被实施。程序代码可以完全在计算机上、部分在计算机上、作为独立的软件包、部分在计算机上且部分在远程计算机上或完全在远程计算机或服务器上执行。Computer program codes for implementing the methods of the present disclosure may be written in one or more programming languages. These computer program codes can be provided to processors of general-purpose computers, special-purpose computers, or other programmable data processing devices, so that when the program codes are executed by the computer or other programmable data processing devices, The functions/operations specified in are implemented. The program code may execute entirely on the computer, partly on the computer, as a stand-alone software package, partly on the computer and partly on a remote computer or entirely on the remote computer or server.
在本公开的上下文中，计算机程序代码或者相关数据可以由任意适当载体承载，以使得设备、装置或者处理器能够执行上文描述的各种处理和操作。载体的示例包括信号、计算机可读介质、等等。信号的示例可以包括电、光、无线电、声音或其它形式的传播信号，诸如载波、红外信号等。In the context of the present disclosure, computer program code or related data may be carried by any suitable carrier to enable a device, apparatus or processor to perform the various processes and operations described above. Examples of carriers include signals, computer readable media, and the like. Examples of signals may include electrical, optical, radio, sound, or other forms of propagated signals, such as carrier waves, infrared signals, and the like.
计算机可读介质可以是包含或存储用于或有关于指令执行***、装置或设备的程序的任何有形介质。计算机可读介质可以是计算机可读信号介质或计算机可读存储介质。计算机可读介质可以包括但不限于电子的、磁的、光学的、电磁的、红外的或半导体***、装置或设备，或其任意合适的组合。计算机可读存储介质的更详细示例包括带有一根或多根导线的电气连接、便携式计算机磁盘、硬盘、随机存储存取器(RAM)、只读存储器(ROM)、可擦除可编程只读存储器(EPROM或闪存)、光存储设备、磁存储设备，或其任意合适的组合。A computer readable medium may be any tangible medium that contains or stores a program for or related to an instruction execution system, apparatus, or device. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. More detailed examples of computer-readable storage media include electrical connections with one or more wires, portable computer diskettes, hard disks, random storage access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash), optical storage, magnetic storage, or any suitable combination thereof.
此外，尽管在附图中以特定顺序描述了本公开的方法的操作，但是这并非要求或者暗示必须按照该特定顺序来执行这些操作，或是必须执行全部所示的操作才能实现期望的结果。相反，流程图中描绘的步骤可以改变执行顺序。附加地或备选地，可以省略某些步骤，将多个步骤组合为一个步骤执行，和/或将一个步骤分解为多个步骤执行。还应当注意，根据本公开的两个或更多装置的特征和功能可以在一个装置中具体化。反之，上文描述的一个装置的特征和功能可以进一步划分为由多个装置来具体化。In addition, while operations of methods of the present disclosure are depicted in a particular order in the figures, this does not require or imply that operations must be performed in that particular order, or that all illustrated operations must be performed, to achieve desirable results. Conversely, the steps depicted in the flowcharts may be performed in an altered order. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step for execution, and/or one step may be decomposed into multiple steps for execution. It should also be noted that the features and functions of two or more devices according to the present disclosure may be embodied in one device. Conversely, the features and functions of one device described above may be further divided to be embodied by a plurality of devices.
以上已经描述了本公开的各实现，上述说明是示例性的，并非穷尽的，并且也不限于所公开的各实现。在不偏离所说明的各实现的范围和精神的情况下，对于本技术领域的普通技术人员来说许多修改和变更都是显而易见的。本文中所用术语的选择，旨在很好地解释各实现的原理、实际应用或对市场中的技术的改进，或者使本技术领域的其他普通技术人员能理解本文公开的各个实现方式。Having described various implementations of the present disclosure, the foregoing description is exemplary, not exhaustive, and is not limited to the disclosed implementations. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described implementations. The choice of terminology used herein aims to well explain the principle of each implementation, practical application or improvement to the technology in the market, or to enable other ordinary skilled persons in the technical field to understand the various implementations disclosed herein.

Claims (27)

  1. 一种小区切换方法，包括：A cell switching method, comprising:
    终端设备执行从源小区到第一目标小区的切换过程，所述第一目标小区属于候选小区集合；The terminal device performs a handover process from a source cell to a first target cell, where the first target cell belongs to the set of candidate cells;
    所述终端设备确定在所述切换过程中发生切换失败；The terminal device determines that a handover failure occurs during the handover process;
    所述终端设备确定回退指示信息，所述回退指示信息至少指示在切换失败时是否回退到源小区；以及The terminal device determines fallback indication information, where the fallback indication information at least indicates whether to fall back to the source cell when the handover fails; and
    当所述回退指示信息指示在切换失败时回退到源小区时，所述终端设备执行到所述源小区的回退操作。When the fallback indication information indicates fallback to the source cell when the handover fails, the terminal device performs a fallback operation to the source cell.
  2. 根据权利要求1所述的方法，还包括：The method according to claim 1, further comprising:
    当从发起所述切换过程开始经过的时间达到第一预设时间段时或者当发生切换失败的次数达到次数阈值时，所述终端设备执行小区选择过程。When the elapsed time from initiating the handover process reaches a first preset time period or when the number of times handover failures occur reaches a threshold value, the terminal device executes a cell selection process.
  3. 根据权利要求1所述的方法，还包括：The method according to claim 1, further comprising:
    当确定所述回退操作失败时，所述终端设备执行小区选择过程。When it is determined that the fallback operation fails, the terminal device performs a cell selection process.
  4. 根据权利要求1所述的方法，还包括：The method according to claim 1, further comprising:
    当所述回退指示信息指示在切换失败时不回退到源小区时，所述终端设备执行小区选择过程。When the fallback indication information indicates not to fallback to the source cell when the handover fails, the terminal device performs a cell selection process.
  5. 根据权利要求2所述的方法，其中所述回退指示信息还指示以下至少一项：所述第一预设时间段或所述次数阈值。The method according to claim 2, wherein the rollback indication information further indicates at least one of the following: the first preset time period or the times threshold.
  6. 根据权利要求1至3中任一项所述的方法，还包括：The method according to any one of claims 1 to 3, further comprising:
    所述终端设备向所述源小区的网络设备发送第一消息，所述第一消息指示以下至少一项：The terminal device sends a first message to the network device of the source cell, where the first message indicates at least one of the following:
    第一预设时间段或次数阈值；a first preset time period or times threshold;
    所述切换过程的切换类型；the handover type of the handover process;
    发生切换失败的次数；the number of handover failures;
    发生所述切换失败时的时间；the time when the handover failure occurs;
    从发起所述切换过程到发生所述切换失败之间的第一时长；A first period of time from initiating the handover process to the occurrence of the handover failure;
    在发生所述切换失败时针对所述第一目标小区的第一测量信息；First measurement information for the first target cell when the handover failure occurs;
    在发生所述切换失败时针对所述源小区的第二测量信息；Second measurement information for the source cell when the handover failure occurs;
    在发生所述切换失败时针对所述候选小区集合中的其他候选小区的第三测量信息；Third measurement information for other candidate cells in the set of candidate cells when the handover failure occurs;
    是否执行回退；Whether to perform rollback;
    回退成功的次数；The number of successful rollbacks;
    回退成功时的时间；The time when rollback is successful;
    回退成功时针对所述第一目标小区的第四测量信息；Fourth measurement information for the first target cell when the fallback is successful;
    回退成功时针对所述源小区的第五测量信息；Fifth measurement information for the source cell when the fallback is successful;
    回退成功时针对所述其他候选小区的第六测量信息；Sixth measurement information for the other candidate cells when the fallback is successful;
    从发生切换失败到回退成功之间的第二时长；The second time period between the occurrence of handover failure and the rollback success;
    是否回退失败；Whether the rollback failed;
    回退失败时的时间；The time when the fallback failed;
    回退失败时针对所述第一目标小区的第七测量信息；Seventh measurement information for the first target cell when the fallback fails;
    回退失败时针对所述源小区的第八测量信息；Eighth measurement information for the source cell when the fallback fails;
    回退失败时针对所述候选小区集合中的其他候选小区的第九测量信息；或Ninth measurement information for other candidate cells in the set of candidate cells when the fallback fails; or
    从发生切换失败到回退失败之间的第三时长。The third time period between the occurrence of switchover failure and the fallback failure.
  7. 根据权利要求2至4中任一项所述的方法，还包括：The method according to any one of claims 2 to 4, further comprising:
    当所述小区选择过程选择了所述候选小区集合中的第二目标小区时，所述终端设备执行到所述第二目标小区的切换过程；When the cell selection process selects a second target cell in the set of candidate cells, the terminal device performs a handover process to the second target cell;
    当所述小区选择过程选择了不属于所述候选小区集合的第二目标小区时，所述终端设备执行与所述第二目标小区的无线资源控制RRC重建立过程；或When the cell selection process selects a second target cell that does not belong to the candidate cell set, the terminal device performs a radio resource control RRC re-establishment process with the second target cell; or
    当在第二预设时间段内无法找到合适小区时，所述终端设备转换到空闲态。When a suitable cell cannot be found within the second preset time period, the terminal device transitions to an idle state.
  8. 根据权利要求2至4中任一项所述的方法，还包括：The method according to any one of claims 2 to 4, further comprising:
    当所述小区选择过程选择了第二目标小区时，所述终端设备执行与所述第二目标小区的RRC重建立过程；或When the cell selection procedure selects a second target cell, the terminal device performs an RRC re-establishment procedure with the second target cell; or
    当在第二预设时间段内无法找到合适小区时，所述终端设备转换到空闲态。When a suitable cell cannot be found within the second preset time period, the terminal device transitions to an idle state.
  9. 根据权利要求7或8所述的方法，还包括：The method according to claim 7 or 8, further comprising:
    当所述小区选择过程选择了所述第二目标小区且成功切换到所述第二目标小区时，所述终端设备发送第二消息，所述第二消息指示以下至少一项：When the cell selection process selects the second target cell and successfully switches to the second target cell, the terminal device sends a second message, where the second message indicates at least one of the following:
    第一预设时间段或次数阈值；a first preset time period or times threshold;
    所述切换过程的切换类型；the handover type of the handover process;
    发生切换失败的次数；the number of handover failures;
    发生所述切换失败时的时间；the time when the handover failure occurred;
    从发起所述切换过程到发生所述切换失败之间的第一时长；A first period of time from initiating the handover process to the occurrence of the handover failure;
    在发生所述切换失败时针对所述第一目标小区的第一测量信息；First measurement information for the first target cell when the handover failure occurs;
    在发生所述切换失败时针对所述源小区的第二测量信息；Second measurement information for the source cell when the handover failure occurs;
    在发生所述切换失败时针对所述候选小区集合中的其他候选小区的第三测量信息；Third measurement information for other candidate cells in the set of candidate cells when the handover failure occurs;
    是否执行回退；Whether to perform rollback;
    回退成功的次数；The number of successful rollbacks;
    回退成功时的时间；The time when rollback is successful;
    回退成功时针对所述第一目标小区的第四测量信息；Fourth measurement information for the first target cell when the fallback is successful;
    回退成功时针对所述源小区的第五测量信息；Fifth measurement information for the source cell when the fallback is successful;
    回退成功时针对所述候选小区集合中的其他候选小区的第六测量信息；Sixth measurement information for other candidate cells in the set of candidate cells when the fallback is successful;
    从发生切换失败到回退成功之间的第二时长；The second time period between the occurrence of handover failure and the rollback success;
    是否回退失败；Whether the rollback failed;
    回退失败时的时间；The time when the fallback failed;
    回退失败时针对所述第一目标小区的第七测量信息；Seventh measurement information for the first target cell when the fallback fails;
    回退失败时针对所述源小区的第八测量信息；Eighth measurement information for the source cell when the fallback fails;
    回退失败时针对所述候选小区集合中的其他候选小区的第九测量信息；Ninth measurement information for other candidate cells in the candidate cell set when the fallback fails;
    从发生切换失败到回退失败之间的第三时长；The third period of time from the occurrence of the handover failure to the fallback failure;
    从回退失败到成功选择所述第二目标小区之间的第四时长；或A fourth period of time between fallback failure and successful selection of the second target cell; or
    从发生切换失败到成功选择所述第二目标小区之间的第五时长。A fifth time period between when the handover failure occurs and when the second target cell is successfully selected.
  10. 根据权利要求1至9中任一项所述的方法，其中所述回退指示信息是从所述源小区 的网络设备接收到的，或者其中所述回退指示信息被预先配置在所述终端设备中。The method according to any one of claims 1 to 9, wherein the fallback indication information is received from the network equipment of the source cell, or wherein the fallback indication information is pre-configured in the terminal in the device.
  11. 一种小区切换的方法，包括：A method for cell handover, comprising:
    网络设备向终端设备发送回退指示信息，所述回退指示信息至少指示在切换失败时是否回退到源小区，所述网络设备为所述终端设备执行切换过程时的源小区的网络设备；以及The network device sends fallback instruction information to the terminal device, the fallback instruction information at least indicates whether to fall back to the source cell when the handover fails, and the network device is the network device of the source cell when the terminal device performs a handover process; as well as
    当所述终端设备在切换过程中发生切换失败且所述回退指示信息指示在切换失败时回退到源小区时，所述网络设备基于所述终端设备的回退操作而执行与所述终端设备进行连接的操作。When the terminal device fails to perform handover during the handover process and the fallback indication information indicates that the terminal device falls back to the source cell when the handover fails, the network device performs the communication with the terminal based on the fallback operation of the terminal device The operation of the device to connect.
  12. 根据权利要求11所述的方法，还包括：The method of claim 11, further comprising:
    所述网络设备接收来自所述终端设备的切换报告消息，所述切换报告消息指示以下至少一项：The network device receives a handover report message from the terminal device, and the handover report message indicates at least one of the following:
    第一预设时间段或次数阈值；a first preset time period or times threshold;
    所述切换过程的切换类型；the handover type of the handover process;
    发生切换失败的次数；the number of handover failures;
    发生所述切换失败时的时间；the time when the handover failure occurred;
    从发起所述切换过程到发生所述切换失败之间的第一时长；A first period of time from initiating the handover process to the occurrence of the handover failure;
    在发生所述切换失败时针对所述切换过程所切换至的第一目标小区的第一测量信息；First measurement information for a first target cell to which the handover process is handed over when the handover failure occurs;
    在发生所述切换失败时针对所述源小区的第二测量信息；Second measurement information for the source cell when the handover failure occurs;
    在发生所述切换失败时针对候选小区集合中的其他候选小区的第三测量信息；Third measurement information for other candidate cells in the candidate cell set when the handover failure occurs;
    是否执行回退；Whether to perform rollback;
    回退成功的次数；The number of successful rollbacks;
    回退成功时的时间；The time when rollback is successful;
    回退成功时针对所述第一目标小区的第四测量信息；Fourth measurement information for the first target cell when the fallback is successful;
    回退成功时针对所述源小区的第五测量信息；Fifth measurement information for the source cell when the fallback is successful;
    回退成功时针对所述其他候选小区的第六测量信息；Sixth measurement information for the other candidate cells when the fallback is successful;
    从发生切换失败到回退成功之间的第二时长；The second time period between the occurrence of handover failure and the rollback success;
    是否回退失败；Whether the rollback failed;
    回退失败时的时间；The time when the fallback failed;
    回退失败时针对所述第一目标小区的第七测量信息；Seventh measurement information for the first target cell when the fallback fails;
    回退失败时针对所述源小区的第八测量信息；Eighth measurement information for the source cell when the fallback fails;
    回退失败时针对所述候选小区集合中的其他候选小区的第九测量信息；Ninth measurement information for other candidate cells in the candidate cell set when the fallback fails;
    从发生切换失败到回退失败之间的第三时长；The third period of time from the occurrence of the handover failure to the fallback failure;
    从回退失败到成功选择所驻留的小区之间的第四时长；或A fourth period of time between fallback failure and successful selection of the cell to camp on; or
    从发生切换失败到成功选择所驻留的小区之间的第五时长。The fifth time period between when handover failure occurs and when the cell to camp on is successfully selected.
  13. 一种通信装置，包括：A communication device comprising:
    切换模块，被配置为执行从源小区到第一目标小区的切换过程，所述第一目标小区属于候选小区集合；a handover module configured to perform a handover procedure from a source cell to a first target cell, the first target cell belonging to the set of candidate cells;
    第一确定模块，被配置为确定在所述切换过程中发生切换失败；A first determination module configured to determine that a handover failure occurs during the handover process;
    第二确定模块，被配置为确定回退指示信息，所述回退指示信息至少指示在切换失败时是否回退到源小区；以及The second determination module is configured to determine fallback indication information, the fallback indication information at least indicates whether to fall back to the source cell when the handover fails; and
    回退模块，被配置为当所述回退指示信息指示在切换失败时回退到源小区时，执行到所 述源小区的回退操作。The fallback module is configured to perform a fallback operation to the source cell when the fallback indication information indicates that the fallback to the source cell occurs when the handover fails.
  14. 根据权利要求13所述的装置，还包括小区选择模块，被配置为：The apparatus according to claim 13, further comprising a cell selection module configured to:
    当从发起所述切换过程开始经过的时间达到第一预设时间段时或者当发生切换失败的次数达到次数阈值时，执行小区选择过程。When the elapsed time from initiating the handover process reaches a first preset time period or when the number of times handover failures occur reaches a number threshold, a cell selection process is performed.
  15. 根据权利要求13所述的装置，还包括小区选择模块，被配置为：The apparatus according to claim 13, further comprising a cell selection module configured to:
    当确定所述回退操作失败时，执行小区选择过程。When it is determined that the rollback operation fails, a cell selection process is performed.
  16. 根据权利要求13所述的装置，还包括小区选择模块，被配置为：The apparatus according to claim 13, further comprising a cell selection module configured to:
    当所述回退指示信息指示在切换失败时不回退到源小区时，执行小区选择过程。When the fallback indication information indicates not to fallback to the source cell when the handover fails, a cell selection process is performed.
  17. 根据权利要求14所述的装置，其中所述回退指示信息还指示以下至少一项：所述第一预设时间段或所述次数阈值。The device according to claim 14, wherein the rollback indication information further indicates at least one of the following: the first preset time period or the times threshold.
  18. 根据权利要求13至15中任一项所述的装置，还包括发送模块，被配置为：The device according to any one of claims 13 to 15, further comprising a sending module configured to:
    向所述源小区的网络设备发送第一消息，所述第一消息指示以下至少一项：sending a first message to the network device of the source cell, where the first message indicates at least one of the following:
    第一预设时间段或次数阈值；a first preset time period or times threshold;
    所述切换过程的切换类型；the handover type of the handover process;
    发生切换失败的次数；the number of handover failures;
    发生所述切换失败时的时间；the time when the handover failure occurs;
    从发起所述切换过程到发生所述切换失败之间的第一时长；A first period of time from initiating the handover process to the occurrence of the handover failure;
    在发生所述切换失败时针对所述第一目标小区的第一测量信息；First measurement information for the first target cell when the handover failure occurs;
    在发生所述切换失败时针对所述源小区的第二测量信息；Second measurement information for the source cell when the handover failure occurs;
    在发生所述切换失败时针对所述候选小区集合中的其他候选小区的第三测量信息；Third measurement information for other candidate cells in the set of candidate cells when the handover failure occurs;
    是否执行回退；Whether to perform rollback;
    回退成功的次数；The number of successful rollbacks;
    回退成功的时间；The time when the rollback is successful;
    回退成功时针对所述第一目标小区的第四测量信息；Fourth measurement information for the first target cell when the fallback is successful;
    回退成功时针对所述源小区的第五测量信息；Fifth measurement information for the source cell when the fallback is successful;
    回退成功时针对所述其他候选小区的第六测量信息；Sixth measurement information for the other candidate cells when the fallback is successful;
    从发生切换失败到回退成功之间的第二时长；The second time period between the occurrence of handover failure and the rollback success;
    是否回退失败；Whether the rollback failed;
    回退失败时的时间；The time when the fallback failed;
    回退失败时针对所述第一目标小区的第七测量信息；Seventh measurement information for the first target cell when the fallback fails;
    回退失败时针对所述源小区的第八测量信息；Eighth measurement information for the source cell when the fallback fails;
    回退失败时针对所述候选小区集合中的其他候选小区的第九测量信息；或Ninth measurement information for other candidate cells in the set of candidate cells when the fallback fails; or
    从发生切换失败到回退失败之间的第三时长。The third time period between the occurrence of switchover failure and the fallback failure.
  19. 根据权利要求14至16中任一项所述的装置，其中所述切换模块，还被配置为当所述小区选择过程选择了所述候选小区集合中的第二目标小区时，执行到所述第二目标小区的切换过程；The device according to any one of claims 14 to 16, wherein the handover module is further configured to execute to the Handover process of the second target cell;
    还包括重建立模块，被配置为当所述小区选择过程选择了不属于所述候选小区集合的第二目标小区时，执行与所述第二目标小区的无线资源控制RRC重建立过程；或It also includes a re-establishment module configured to perform a radio resource control RRC re-establishment process with the second target cell when the cell selection process selects a second target cell that does not belong to the candidate cell set; or
    还包括转换模块，被配置为当在第二预设时间段内无法找到合适小区时，转换到空闲态。It also includes a switching module configured to switch to an idle state when no suitable cell can be found within a second preset time period.
  20. 根据权利要求14至16中任一项所述的装置，还包括：Apparatus according to any one of claims 14 to 16, further comprising:
    重建立模块，被配置为当所述小区选择过程选择了第二目标小区时，执行与所述第二目标小区的RRC重建立过程；或a re-establishment module configured to perform an RRC re-establishment process with the second target cell when the cell selection process selects the second target cell; or
    转换模块，被配置为当在第二预设时间段内无法找到合适小区时，转换到空闲态。The switching module is configured to switch to the idle state when no suitable cell can be found within the second preset time period.
  21. 根据权利要求19或20所述的装置，还包括发送模块，被配置为：The device according to claim 19 or 20, further comprising a sending module configured to:
    当所述小区选择过程选择了所述第二目标小区且成功切换到所述第二目标小区时，发送第二消息，所述第二消息指示以下至少一项：When the cell selection process selects the second target cell and successfully switches to the second target cell, sending a second message, where the second message indicates at least one of the following:
    第一预设时间段或次数阈值；a first preset time period or times threshold;
    所述切换过程的切换类型；the handover type of the handover process;
    发生切换失败的次数；the number of handover failures;
    发生所述切换失败时的时间；the time when the handover failure occurred;
    从发起所述切换过程到发生所述切换失败之间的第一时长；A first period of time from initiating the handover process to the occurrence of the handover failure;
    在发生所述切换失败时针对所述第一目标小区的第一测量信息；First measurement information for the first target cell when the handover failure occurs;
    在发生所述切换失败时针对所述源小区的第二测量信息；Second measurement information for the source cell when the handover failure occurs;
    在发生所述切换失败时针对所述候选小区集合中的其他候选小区的第三测量信息；Third measurement information for other candidate cells in the set of candidate cells when the handover failure occurs;
    是否执行回退；Whether to perform rollback;
    回退成功的次数；The number of successful rollbacks;
    回退成功时的时间；The time when rollback is successful;
    回退成功时针对所述第一目标小区的第四测量信息；Fourth measurement information for the first target cell when the fallback is successful;
    回退成功时针对所述源小区的第五测量信息；Fifth measurement information for the source cell when the fallback is successful;
    回退成功时针对所述候选小区集合中的其他候选小区的第六测量信息；Sixth measurement information for other candidate cells in the set of candidate cells when the fallback is successful;
    从发生切换失败到回退成功之间的第二时长；The second time period between the occurrence of handover failure and the rollback success;
    是否回退失败；Whether the rollback failed;
    回退失败时的时间；The time when the fallback failed;
    回退失败时针对所述第一目标小区的第七测量信息；Seventh measurement information for the first target cell when the fallback fails;
    回退失败时针对所述源小区的第八测量信息；Eighth measurement information for the source cell when the fallback fails;
    回退失败时针对所述候选小区集合中的其他候选小区的第九测量信息；Ninth measurement information for other candidate cells in the candidate cell set when the fallback fails;
    从发生切换失败到回退失败之间的第三时长；The third period of time from the occurrence of the handover failure to the fallback failure;
    从回退失败到成功选择所述第二目标小区之间的第四时长；或A fourth period of time between fallback failure and successful selection of the second target cell; or
    从发生切换失败到成功选择所述第二目标小区之间的第五时长。A fifth time period between when the handover failure occurs and when the second target cell is successfully selected.
  22. 根据权利要求13至21中任一项所述的装置，其中所述回退指示信息是从所述源小区的网络设备接收到的，或者其中所述回退指示信息被预先配置在所述通信装置中。The apparatus according to any one of claims 13 to 21, wherein the fallback indication information is received from the network equipment of the source cell, or wherein the fallback indication information is pre-configured in the communication device.
  23. 一种通信装置，包括：A communication device comprising:
    发送模块，被配置为向终端设备发送回退指示信息，所述回退指示信息至少指示在切换失败时是否回退到源小区，所述通信装置为所述终端设备执行切换过程时的源小区的网络设备；以及The sending module is configured to send fallback instruction information to the terminal device, the fallback instruction information at least indicates whether to fall back to the source cell when the handover fails, and the communication device is the source cell when the terminal device performs the handover process network equipment; and
    连接模块，被配置为当所述终端设备在切换过程中发生切换失败且所述回退指示信息指示在切换失败时回退到源小区时，基于所述终端设备的回退操作而执行与所述终端设备进行连接的操作。The connection module is configured to perform a connection with the terminal device based on the fallback operation of the terminal device when a handover failure occurs during the handover process and the fallback indication information indicates that the terminal device falls back to the source cell when the handover fails. Operations for connecting to the above-mentioned terminal equipment.
  24. 根据权利要求23所述的装置，还包括接收模块，被配置为：The apparatus of claim 23, further comprising a receiving module configured to:
    接收来自所述终端设备的切换报告消息，所述切换报告消息指示以下至少一项：receiving a handover report message from the terminal device, the handover report message indicating at least one of the following:
    第一预设时间段或次数阈值；a first preset time period or times threshold;
    所述切换过程的切换类型；the handover type of the handover process;
    发生切换失败的次数；the number of handover failures;
    发生所述切换失败时的时间；the time when the handover failure occurs;
    从发起所述切换过程到发生所述切换失败之间的第一时长；A first period of time from initiating the handover process to the occurrence of the handover failure;
    在发生所述切换失败时针对所述切换过程所切换至的第一目标小区的第一测量信息；First measurement information for a first target cell to which the handover process is handed over when the handover failure occurs;
    在发生所述切换失败时针对所述源小区的第二测量信息；Second measurement information for the source cell when the handover failure occurs;
    在发生所述切换失败时针对候选小区集合中的其他候选小区的第三测量信息；Third measurement information for other candidate cells in the candidate cell set when the handover failure occurs;
    是否执行回退；Whether to perform rollback;
    回退成功的次数；The number of successful rollbacks;
    回退成功的时间；The time when the rollback is successful;
    回退成功时针对所述第一目标小区的第四测量信息；Fourth measurement information for the first target cell when the fallback is successful;
    回退成功时针对所述源小区的第五测量信息；Fifth measurement information for the source cell when the fallback is successful;
    回退成功时针对所述其他候选小区的第六测量信息；Sixth measurement information for the other candidate cells when the fallback is successful;
    从发生切换失败到回退成功之间的第二时长；The second time period between the occurrence of handover failure and the rollback success;
    是否回退失败；Whether the rollback failed;
    回退失败时的时间；The time when the fallback failed;
    回退失败时针对所述第一目标小区的第七测量信息；Seventh measurement information for the first target cell when the fallback fails;
    回退失败时针对所述源小区的第八测量信息；Eighth measurement information for the source cell when the fallback fails;
    回退失败时针对所述候选小区集合中的其他候选小区的第九测量信息；Ninth measurement information for other candidate cells in the candidate cell set when the fallback fails;
    从发生切换失败到回退失败之间的第三时长；The third period of time from the occurrence of the handover failure to the fallback failure;
    从回退失败到成功选择所驻留的小区之间的第四时长；或A fourth period of time between fallback failure and successful selection of the cell to camp on; or
    从发生切换失败到成功选择所驻留的小区之间的第五时长。The fifth time period between when handover failure occurs and when the cell to camp on is successfully selected.
  25. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现根据权利要求1至12中任一项所述的方法。A computer-readable storage medium, characterized in that the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the computer-readable storage medium according to any one of claims 1 to 12 is implemented. Methods.
  26. 一种计算机程序产品，其特征在于，所述计算机程序产品上包含计算机可执行指令，所述计算机可执行指令在被执行时实现根据权利要求1至12中任一项所述的方法。A computer program product, characterized in that the computer program product contains computer-executable instructions, the computer-executable instructions implement the method according to any one of claims 1 to 12 when executed.
  27. 一种芯片，其特征在于，包括处理电路，被配置为执行根据权利要求1至12中任一项所述的方法。A chip, characterized by comprising a processing circuit configured to execute the method according to any one of claims 1 to 12.
PCT/CN2022/118252 2021-09-15 2022-09-09 Cell handover method and communication apparatus WO2023040787A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202111082788.1 2021-09-15
CN202111082788.1A CN115811766A (en) 2021-09-15 2021-09-15 Cell switching method and communication device

Publications (1)

Publication Number Publication Date
WO2023040787A1 true WO2023040787A1 (en) 2023-03-23

Family

ID=85482080

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/118252 WO2023040787A1 (en) 2021-09-15 2022-09-09 Cell handover method and communication apparatus

Country Status (2)

Country Link
CN (1) CN115811766A (en)
WO (1) WO2023040787A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2031920A1 (en) * 2007-06-29 2009-03-04 Nokia Siemens Networks Oy Method for handover data acqusition in a cellular communications network and communications network
CN101500279A (en) * 2008-02-03 2009-08-05 中兴通讯股份有限公司 Wireless link recovery method
WO2021091450A1 (en) * 2019-11-07 2021-05-14 Telefonaktiebolaget Lm Ericsson (Publ) Fallback to source cell during dual active protocol stack handover
CN112867075A (en) * 2019-11-08 2021-05-28 华为技术有限公司 Mobility optimization method and related device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2031920A1 (en) * 2007-06-29 2009-03-04 Nokia Siemens Networks Oy Method for handover data acqusition in a cellular communications network and communications network
CN101500279A (en) * 2008-02-03 2009-08-05 中兴通讯股份有限公司 Wireless link recovery method
WO2021091450A1 (en) * 2019-11-07 2021-05-14 Telefonaktiebolaget Lm Ericsson (Publ) Fallback to source cell during dual active protocol stack handover
CN112867075A (en) * 2019-11-08 2021-05-28 华为技术有限公司 Mobility optimization method and related device

Also Published As

Publication number Publication date
CN115811766A (en) 2023-03-17

Similar Documents

Publication Publication Date Title
US9635585B2 (en) Energy saving method, system and device for base station
WO2021008478A1 (en) Information reporting method and corresponding user equipment
WO2021088270A1 (en) Mobility optimization method and related apparatus
EP2188911A1 (en) Transfer of uplink power contorl parameters during handovers
WO2018027947A1 (en) Data processing method and relevant device
CN112867075B (en) Mobility optimization method and related device
US10993158B2 (en) Mobile terminal apparatus, base station apparatus, communication system, and communication control method
US11146993B2 (en) Handover with postponed path switch
US20230075762A1 (en) Handover method and apparatus, storage medium, and terminal
WO2021208072A1 (en) Radio resource control (rrc) re-establishment method and apparatus
CN116636253A (en) Mobility of small data transfer procedures
WO2020248283A1 (en) Wireless communication method and apparatus, and terminal device
WO2020155120A1 (en) Method and apparatus for radio communication
WO2022083469A1 (en) Method and apparatus for determining mro critical scenario, and device
TW202341775A (en) Methods and equipment of ta maintenance and acquisition
WO2023040787A1 (en) Cell handover method and communication apparatus
EP3487225A1 (en) Small cell acquisition method and terminal
EP3930362B1 (en) Wireless communication method, terminal device and network device
WO2019153157A1 (en) Cell handover method, network node and terminal device
WO2024051513A1 (en) Information processing method, apparatus and device
CN112868253B (en) Condition-triggered configuration method and related product
WO2022227841A1 (en) Mobility performance optimization method and communication apparatus
WO2023108354A1 (en) Wireless communication method, and terminal device and network device
WO2023011612A1 (en) Mobility management method and communication apparatus
WO2021068230A1 (en) Switching processing method, terminal device, and network device

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22869156

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE