WO2017092021A1 - Procédé et appareil de commutation de cellule - Google Patents

Procédé et appareil de commutation de cellule Download PDF

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Publication number
WO2017092021A1
WO2017092021A1 PCT/CN2015/096367 CN2015096367W WO2017092021A1 WO 2017092021 A1 WO2017092021 A1 WO 2017092021A1 CN 2015096367 W CN2015096367 W CN 2015096367W WO 2017092021 A1 WO2017092021 A1 WO 2017092021A1
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WIPO (PCT)
Prior art keywords
access network
terminal device
network device
cell
preamble sequence
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PCT/CN2015/096367
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English (en)
Chinese (zh)
Inventor
杨勇
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华为技术有限公司
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Priority to CN201580084935.5A priority Critical patent/CN108293210B/zh
Priority to PCT/CN2015/096367 priority patent/WO2017092021A1/fr
Publication of WO2017092021A1 publication Critical patent/WO2017092021A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off

Definitions

  • the present invention relates to the field of mobile communications technologies, and in particular, to a cell switching method and device.
  • the base station When the user equipment (UE) is to perform the cell handover, the base station sends a handover command to the UE. After receiving the handover command, the UE needs to synchronize and access the target cell as soon as possible, so that the UE may not be able to feedback to the base station.
  • a handover command is received (some commercial UEs may not feed back the handover command sent by the base station, but directly to the target cell for access).
  • the base station does not receive the feedback of the handover command, the UE may not receive the handover command, and may retransmit the handover command to the UE through the radio link control (RLC) retransmission mechanism, which may cause the handover command. Invalid retransmission, wasting base station resources.
  • RLC radio link control
  • the embodiments of the present invention provide a cell handover method and device, which are used to solve the technical problem of resource waste caused by resending a handover command to a UE.
  • the first aspect provides a cell handover method, including:
  • the first access network device sends a handover command to the terminal device, where the handover command is used to instruct the terminal device to switch to the second cell;
  • the first access network device If the first access network device does not receive the feedback from the terminal device for the handover command, the first access network device detects whether the terminal device passes the second cell to the second connection The network access device sends a preamble sequence
  • the first access network device If the first access network device detects that the terminal device has sent the preamble sequence to the second access network device by using the second cell, the first access network device stops to the terminal The device resends the switching command.
  • the first access network device does not receive the handover command after sending the handover command to the terminal device.
  • the first access network device may detect whether the terminal device sends a preamble sequence to the second access network device (ie, the target access network device), and if the terminal device has detected that the terminal device has been connected to the second connection, After the network access device sends the preamble sequence, the first access network device can determine that the terminal device has received the handover command (because the terminal device sends the Preamble to the target access network device after receiving the handover command), therefore, the first The access network device does not need to resend the Preamble to the terminal device, avoiding invalid retransmission of the handover command and saving transmission resources.
  • the method further includes:
  • the first access network device If the first access network device does not detect that the terminal device sends the preamble sequence to the second access network device by using the second cell, the first access network device re-directs to the terminal The device sends the switching command.
  • the first access network device may resend the handover command to the terminal device to ensure that the terminal device can receive the handover command, thereby Perform cell handover to improve handover success rate.
  • the first access network device determines to reside in the first access network device After the terminal device in the first cell is about to switch to the second cell in the second access network device, the method further includes:
  • the access network device acquires an identifier and an access parameter of the terminal device.
  • the method further includes:
  • the first access network device calculates an identifier of the preamble sequence sent by the terminal device according to the identifier and the access parameter of the terminal device.
  • the second access network device allocates the identifier of the preamble sequence to the terminal device, so that the identifier of the preamble sequence sent by the terminal device is allocated by the second access network device, and the second access network device is
  • the terminal device allocates the identifier of the preamble sequence, it is allocated according to the identifier of the terminal device, the access parameter, and the like. Therefore, the first access network device can obtain the identifier of the terminal device and the access parameter, so that the identifier of the preamble sequence to be sent by the terminal device can be calculated, so that the first access network device can perform detection.
  • the first access network device detects whether the terminal device passes the second cell to the The second access network device sends the preamble sequence, including:
  • the first access network device matches the identifier of the detected preamble sequence with the calculated identifier of the preamble sequence sent by the terminal device;
  • the first access network device determines that the terminal device passes the second cell to the second interface.
  • the network access device sends the preamble sequence.
  • the first access network device may receive multiple preamble sequences, and in order to detect whether the terminal device sends the preamble sequence to the second access network device, the first access network device may use the calculated preamble sequence sent by the terminal device.
  • the identifier matches the identifier of the detected preamble sequence. If the matching is successful, it may be determined that the terminal device sends the preamble sequence to the second access network device. This matching method is also simple and easy to implement.
  • a first access network device in a second aspect, is provided.
  • the structure of the access network device includes a processor, a transmitter, and a receiver, and the processor is configured to support an access network.
  • the device performs the corresponding function in the method of the first aspect.
  • the transmitter and the receiver are configured to support communication between an access network device and a terminal device, and the transmitter transmits information or instructions involved in the method of the first aspect to the terminal device, the receiver receiving terminal Information or instructions involved in the method of the first aspect of the device transmission.
  • the access network device can also include a memory for coupling with the processor that retains the necessary program instructions and data for the access network device.
  • a second access network device comprising means for performing the method of the first aspect.
  • FIG. 1 is a flowchart of a cell handover performed by a user equipment
  • FIG. 2 is a flowchart of a cell handover method according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of an access network device according to an embodiment of the present invention.
  • FIG. 4 is a structural block diagram of an access network device according to an embodiment of the present invention.
  • a terminal device which is a device that provides voice and/or data connectivity to a user, for example, may include a handheld device with wireless connectivity, or a processing device connected to a wireless modem.
  • the terminal device can communicate with the core network via a Radio Access Network (RAN) to exchange voice and/or data with the RAN.
  • the terminal device device may include a wireless terminal device, a mobile terminal device, a Subscriber Unit, a Subscriber Station, a Mobile Station, a Remote Station, and an Access Point (AP). ), Remote Terminal, Access Terminal, User Terminal, User Agent, UE, or User Device.
  • RAN Radio Access Network
  • it can be a mobile phone (or "cellular" phone), with computing of the mobile terminal device Machine, portable, pocket, handheld, computer built-in or in-vehicle mobile device.
  • mobile phone or "cellular” phone
  • computing of the mobile terminal device Machine portable, pocket, handheld, computer built-in or in-vehicle mobile device.
  • PCS Personal Communication Service
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistants
  • An access network device for example comprising a base station (e.g., an access point), which may refer to a device in the access network that communicates over the air interface with the wireless terminal device device over one or more sectors.
  • the base station can be used to convert the received radio frame to an Internet Protocol (IP) packet as a router between the wireless terminal equipment and the rest of the access network, wherein the remainder of the access network can include an IP network.
  • IP Internet Protocol
  • the base station can also coordinate attribute management of the air interface.
  • the base station may be a Radio Network Controller (RNC) or a Base Station Controller (BSC), or may be a Long Term Evolution (LTE) system or an enhanced LTE (LTE-Advanced).
  • RNC Radio Network Controller
  • BSC Base Station Controller
  • LTE Long Term Evolution
  • LTE-Advanced enhanced LTE
  • the evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in the LTE-A) is not limited in the embodiment of the
  • a plurality means two or more.
  • the character "/”, unless otherwise specified, generally indicates that the contextual object is an "or" relationship.
  • FIG. 1 describes a process in which a UE performs cell handover.
  • the user equipment sends a measurement report (Measurement Report) to the base station (eNodeB).
  • eNodeB the base station
  • the base station determines whether the target cell indicated by the measurement report meets the handover threshold, and if yes, performs step 2.
  • the base station sends a handover command to the user equipment.
  • the radio resource control connection reconfiguration RRC Connection Reconfiguration
  • RRC Connection Reconfiguration can be used to send a handover command to the user equipment.
  • the base station starts to wait for the feedback message sent by the user equipment for the handover command, and the general waiting period is 50 ms. If the feedback message sent by the user equipment is received within 50 ms, the base station stops. The switch command is sent to the user equipment, and the process ends. If the feedback message sent by the user equipment is not received within 50 ms, step 3 is performed.
  • the base station resends the handover command to the user equipment according to the RLC retransmission mechanism.
  • the maximum number of times the handover command is retransmitted is generally 2 times.
  • the current mechanism may cause the following problems:
  • an embodiment of the present invention provides a cell handover method, and a process of the method is described as follows.
  • Step 201 The first access network device determines that the terminal device residing in the first cell of the first access network device is about to switch to the second cell in the second access network device.
  • Step 202 The first access network device sends a handover command to the terminal device, where the handover command is used to instruct the terminal device to switch to the second cell.
  • Step 203 If the first access network device does not receive the feedback of the terminal device for the handover command, the first access network device detects whether the terminal device sends the preamble sequence to the second access network device by using the second cell.
  • Step 204 If the first access network device detects that the terminal device has sent the preamble sequence to the second access network device by using the second cell, the first access network device stops resending the handover command to the terminal device.
  • the first cell and the second cell are different cells, and the first access network device and the second access network device may be the same access network device, or may be different access network devices.
  • the terminal device When the terminal device performs cell handover, it will go to the first access network device where the original serving cell is located.
  • the eNodeB sends a measurement report. After receiving the measurement report, the first access network device can determine whether the target cell indicated by the measurement report meets the handover threshold. If not, the first access network device does not allow the terminal device to perform the handover. If the first access network device allows the terminal device to perform cell handover, the first access network device may send a handover command to the terminal device, and the terminal device may perform cell handover after receiving the handover command.
  • the terminal device after receiving the handover command, the terminal device feeds back a response message for the handover command to the first access network device, so that the first access network device can know that the terminal device has received the handover command.
  • the terminal device accesses the target cell as soon as possible after receiving the handover command, so that the terminal device may not send a feedback message to the first access network device after receiving the handover command, or some terminal device sets In order not to send a feedback message to the first access network device.
  • the terminal device When the terminal device accesses the target cell, the preamble sequence is sent to the target cell (that is, the target cell is sent to the access network device where the target cell is located), that is, the preamble is sent, so in the embodiment of the present invention, the terminal device can be
  • the first access network device where the original serving cell is located detects whether the terminal device sends the Preamble. If it detects that the terminal device has sent the Preamble, it can be determined that the terminal device has received the handover command, and there is no need to resend the handover command to the terminal device. Save base station resources, and try to avoid the deterioration of BLER indicators. The resending of the handover command to the terminal device may be understood as not sending the handover command to the terminal device.
  • the first access network device can send a handover command to the terminal device again.
  • the device may wait for the feedback of the terminal device for the handover command.
  • the first access network device may wait for the first duration, if the first connection is within the first duration.
  • the first access network device may determine that the terminal device receives the handover command, and the first access network device may determine that the handover command is not resent to the terminal device, but If the feedback of the terminal device for the handover command is not received within the first time period, the first access network device may detect whether the terminal device has sent the Preamble to the second access network device, if the first access network device detects Terminal device to second access network device If the Preamble is sent, the first access network device determines that the handover command is no longer retransmitted to the terminal device, and if the first access network device does not detect that the terminal device sends the Preamble to the second access network device, the first access The network device may send a handover command to the terminal device again to prevent the terminal device from failing to receive the handover command, thereby improving the handover success rate.
  • the first time length may be, for example, 50 ms, or may be other values, such as less than 50 ms, which is
  • the first access network device may start a timer to detect whether the terminal device has accessed the second access.
  • the network device sent the Preamble.
  • the first access network device determines that the handover command is no longer retransmitted to the terminal device, but the timer
  • the first access network device may send the handover command to the terminal device again.
  • the timing of the timer may be set according to the situation, for example, may be set to 50 ms, or may be set to other values, which is not limited in the embodiment of the present invention.
  • the first access network device may stop sending the handover command to the terminal device to save the base station resource.
  • the maximum number of handover command retransmissions can be manually set, or can be specified by a protocol, for example, it can be 2 times, or it can be other values.
  • the first access network device needs to perform a corresponding operation.
  • the first access network device can obtain the identifier of the terminal device and the access parameter.
  • the identifier of the terminal device may include, for example, a Cell Radio Network Temming Identity (CRNTI) of the terminal device.
  • CNTI Cell Radio Network Temming Identity
  • the access parameters of the terminal device may include, for example, a root sequence number (rootSequenceIndex), a zero correlation sequence configuration (zeroCorrelationZoneConfig), and a high speed flag (highSpeedFlag), and may of course include other parameters.
  • rootSequenceIndex is used to generate the ZC of the Preamble
  • the root set, rootSequenceIndex is the ZC root with the smallest logical number in this ZC root set. By cyclically shifting each ZC root in the ZC root packet set, a Preamble required for random access can be generated.
  • zeroCorrelationZoneConfig is used for the zero correlation window of Preamble detection.
  • the cyclic shift length indirectly determines the amount of cyclic shift and the number of Preambles that can be generated by each ZC root, where Ncs is related to the cell radius.
  • highSpeedFlag is used to indicate the calculation method corresponding to the cyclic shift amount.
  • the identifier and the access parameter of the terminal device may be obtained from a second access network device where the target cell (ie, the second cell) to which the terminal device is to be switched. If the terminal device performs the handover without crossing the access network device, that is, the first access network device and the second access network device are the same access network device, then the first access network device (ie, the second access network) The device may directly allocate the identifier and the access parameter to the terminal device. If the terminal device performs the handover of the access network device, the first access network device and the second access network device are different access network devices. Then, the first access network device needs to obtain the identifier and access parameters of the terminal device from the second access network device. In this case, there are two possible acquisition methods:
  • the first mode the first access network device and the second access network device have an X2 connection, and the first access network device can directly obtain the identifier of the terminal device from the second access network device by using the X2 connection. Access parameters.
  • the second mode the first access network device does not have an X2 connection between the second access network device, and the first access network device can obtain the identifier of the terminal device from the second access network device by using the core network device. Access parameters.
  • the first access network device may calculate an identifier (Identify, ID) of the Preamble sent by the terminal device.
  • Identify, ID There are 64 kinds of Preambles in LTE, and a maximum of 64 Preambles are allocated to a cell.
  • the base station where the cell to be accessed is assigned a Preamble ID to the terminal device, and the terminal device is ready to connect.
  • the base station where the incoming cell is located transmits the Preamble indicated by the ID of the Preamble.
  • the base station allocates the ID of the Preamble to the terminal device, it allocates according to the identifier of the terminal device, the access parameter, and the like.
  • the original serving cell of the terminal device The access network device (ie, the first access network device) may also calculate the ID of the Preamble according to the identifier of the terminal device and the access parameter, and the calculated ID is the same ID as the ID of the Preamble sent by the terminal device. In this way, the first access network device can detect whether the terminal device sends the Preamble to the second access network device.
  • the first access network device when the first access network device detects the Preamble, multiple Preambles may be detected, and the Preambles may be sent by different terminal devices.
  • the first access network device has calculated the ID of the Preamble sent by the terminal device to be switched. Therefore, after detecting the Preamble, the first access network device may separately detect the ID of the detected Preamble.
  • the matching process is to perform a zero correlation operation, and the Preamble with the largest correlation value is regarded as the detected Preamble
  • the first access network device determines that the terminal device sends the Preamble to the second access network device through the second cell.
  • the number of the Preambles detected by the first access network device may be multiple, and the ID of the detected Preamble is successfully matched with the calculated ID of the Preamble sent by the terminal device, which may be that the detected Preamble has at least one Preamble ID.
  • the matching of the calculated ID of the Preamble sent by the terminal device is successful.
  • an embodiment of the present invention provides an access network device, which may include a memory 301, a processor 302, a transmitter 303, and a receiver 304.
  • the processor 302 may be a central processing unit (CPU) or an application specific integrated circuit (ASIC), and may be one or more integrated circuits for controlling program execution, and may be a field programmable gate array.
  • the hardware circuit developed by Field Programmable Gate Array (FPGA) can be a baseband chip.
  • the number of memories 301 may be one or more.
  • the memory 301 may include a read only memory (ROM), a random access memory (RAM), and a disk storage.
  • the transmitter 303 and the receiver 304 may belong to a radio frequency system for performing network communication with an external device such as a terminal device, and may specifically communicate with an external device through a network such as an Ethernet, a radio access network, or a wireless local area network.
  • the sender 303 and the receiver 304 may be located in the same physical module, for example, in a physical module capable of implementing a transceiving function, such as the physical module may be referred to as a transceiver, or the transmitter 303 and the receiver 304 may also be located in separate entities. In the module.
  • the memory 301, the transmitter 303, and the receiver 304 may be connected to the processor 302 via a bus (as shown in FIG. 3 as an example), or may be separately connected to the processor 302 through a dedicated connection line.
  • the code corresponding to the method shown above is solidified into the chip, so that the chip can perform the method shown in FIG. 2 during operation.
  • How to design and program the processor 302 is a technique known to those skilled in the art, and details are not described herein.
  • the access network device may be configured to perform the method described in FIG. 2 above, for example, may be the first access network device as described above, and therefore, for functions implemented by each unit in the access network device, Please refer to the description of the previous method section for details.
  • an embodiment of the present invention provides another access network device, where the access network device may include a sending module 401, a processing module 402, and a receiving module 403.
  • the physical device corresponding to the processing module 402 may be the processor 302 in FIG. 3, the physical device corresponding to the sending module 401 may be the transmitter 303 in FIG. 3, and the physical device corresponding to the receiving module 403 may be FIG. Receiver 304 in the middle.
  • the access network device may be configured to perform the method described in FIG. 2 above, for example, may be the first access network device as described above, and therefore, for functions implemented by each unit in the access network device, Please refer to the description of the previous method section for details.
  • the first access network device may determine whether the terminal device has received the device by detecting whether the terminal device has sent the Preamble to the second access network device. If the switching command sent by the first access network device detects that the terminal device sends the Preamble, the retransmission switching command can be stopped, so that the redundancy retransmission of the handover command can be effectively avoided, and the BLER indicator is prevented from being deteriorated if not detected.
  • the terminal device sends the Preamble the first access network device can resend the switching command to ensure that the terminal device can A handover command is received to perform cell handover, and the handover success rate is improved.
  • the disclosed apparatus and method can be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the unit or unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be used. Combinations can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical or otherwise.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to implement the embodiments of the present invention.
  • the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may also be an independent physical module.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • all or part of the technical solution of the present invention may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for causing a computer device (which may be a personal computer, A server, or network device, or the like, or a processor, performs all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a universal serial bus flash drive, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, and the like, which can store program codes.

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

Abstract

L'invention se rapporte au domaine technique des télécommunications mobiles, et concerne plus particulièrement un procédé et un appareil de commutation de cellule permettant de résoudre le problème technique d'un gaspillage de ressources dû à la retransmission d'une commande de commutation vers un équipement utilisateur (UE). Dans un mode de réalisation de l'invention, un premier appareil de réseau d'accès peut détecter si un appareil terminal transmet une séquence de préambule à un deuxième appareil de réseau d'accès après la transmission, par le premier appareil de réseau d'accès, d'une commande de commutation à l'appareil terminal. S'il est détecté que l'appareil terminal transmet la séquence de préambule au deuxième appareil de réseau d'accès, le premier appareil de réseau d'accès peut déterminer que l'appareil terminal a reçu la commande de commutation. Par conséquent, le premier appareil de réseau d'accès n'a pas besoin de transmettre à nouveau la commande de commutation à l'appareil terminal, ce qui permet d'éviter une retransmission invalide de la commande de commutation et de réduire les ressources de transmission.
PCT/CN2015/096367 2015-12-03 2015-12-03 Procédé et appareil de commutation de cellule WO2017092021A1 (fr)

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CN201580084935.5A CN108293210B (zh) 2015-12-03 2015-12-03 一种小区切换方法及设备
PCT/CN2015/096367 WO2017092021A1 (fr) 2015-12-03 2015-12-03 Procédé et appareil de commutation de cellule

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WO2022154723A1 (fr) * 2021-01-13 2022-07-21 Telefonaktiebolaget Lm Ericsson (Publ) Gestion d'accusés de réception de commande de liaison radio (rlc) de transfert intercellulaire manquants

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