WO2022188890A1 - Procédé, appareil et dispositif de transfert conditionnel, et support de stockage - Google Patents

Procédé, appareil et dispositif de transfert conditionnel, et support de stockage Download PDF

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Publication number
WO2022188890A1
WO2022188890A1 PCT/CN2022/080747 CN2022080747W WO2022188890A1 WO 2022188890 A1 WO2022188890 A1 WO 2022188890A1 CN 2022080747 W CN2022080747 W CN 2022080747W WO 2022188890 A1 WO2022188890 A1 WO 2022188890A1
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WO
WIPO (PCT)
Prior art keywords
base station
terminal
candidate cell
candidate
cell list
Prior art date
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PCT/CN2022/080747
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English (en)
Chinese (zh)
Inventor
刘潇蔓
谢芳
唐晓璇
陈宁宇
Original Assignee
***通信有限公司研究院
***通信集团有限公司
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Publication of WO2022188890A1 publication Critical patent/WO2022188890A1/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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the embodiments of the present application relate to the field of wireless technologies, and in particular, to a condition switching method, apparatus, device, and storage medium.
  • conditional handover can be configured for the terminal, so that when the threshold configured for conditional handover is met, the terminal can actively initiate a random access procedure to the target base station without triggering measurement reporting and waiting for the network to issue a handover command.
  • the base station after the handover may not be able to provide the dual connectivity service to the terminal in time.
  • the embodiments of the present application are expected to provide a condition switching method, apparatus, device, and storage medium.
  • At least one embodiment of the present application provides a conditional switching method, the method comprising:
  • the terminal in the dual connection mode When the terminal in the dual connection mode performs the conditional handover, the terminal is handed over from the first main base station to the second main base station;
  • the terminal acquires a list of candidate cells, and sends the list of candidate cells to the second primary base station; the list of candidate cells represents that the first secondary base station performs a conditional PScell change (CPC, Conditional Pscell Change) on the terminal. ) the secondary cell group configured during configuration;
  • CPC Conditional PScell Change
  • the candidate cell list is used for the second master base station to establish a communication interface with each cell in the candidate cell list under the condition of reserving the first secondary base station, so that the second master base station can communicate with each other.
  • the first secondary base station jointly provides a dual connectivity service for the terminal.
  • the sending the candidate cell list to the second master base station includes:
  • the terminal sends the first information to the second primary base station.
  • the terminal in the dual connectivity mode when the terminal in the dual connectivity mode performs conditional handover, the terminal is switched from the first primary base station to the second primary base station, including:
  • the terminal determines, from a plurality of conditional handover candidate cells, a plurality of candidate cells that satisfy the execution conditions in the conditional handover configuration;
  • the terminal selects a target cell from the plurality of candidate cells to access the second primary base station.
  • the method further includes:
  • the CPC configuration is not released.
  • the method further includes:
  • the terminal receives the updated candidate cell list sent by the second master base station; wherein, the updated candidate cell list is when the second master base station refuses to establish a communication interface with a cell in the candidate cell list, Obtained by updating the CPC configuration;
  • the terminal receives the updated random access configuration sent by the second master base station; wherein, the random access configuration is that at least one cell in the candidate cell list that establishes a communication interface with the second master base station is: Obtained by updating the random access resources reserved by the terminal.
  • At least one embodiment of the present application provides a conditional switching method, the method comprising:
  • the second primary base station acquires a list of candidate cells from the first secondary base station;
  • the candidate cell list represents the first secondary base station a secondary cell group configured when the base station performs CPC configuration on the terminal;
  • the candidate cell list is used for the second master base station to establish a communication interface with each cell in the candidate cell list under the condition of reserving the first secondary base station, so that the second master base station can communicate with each other.
  • the first secondary base station jointly provides a dual connectivity service for the terminal.
  • the second primary base station acquires a candidate cell list from the first secondary base station, including one of the following:
  • the second primary base station After the terminal switches to the second primary base station, the second primary base station sends second information to the first secondary base station; the second information is used to instruct the first secondary base station to send the first secondary base station to the first secondary base station.
  • the second master base station sends the candidate cell list; the second master base station receives the candidate cell list sent by the first secondary base station;
  • the second master base station After the terminal switches to the second master base station, the second master base station receives the candidate cell list sent by the first secondary base station.
  • the method further includes:
  • the second main base station sends the updated candidate cell list to the terminal; wherein, the updated candidate cell list is a response to when the second main base station refuses to establish a communication interface with a cell in the candidate cell list. Obtained by updating the CPC configuration;
  • the second master base station sends the updated random access configuration to the terminal; wherein, the random access configuration is that at least one cell in the candidate cell list that establishes a communication interface with the second master base station is the obtained by updating the random access resources reserved by the terminal.
  • At least one embodiment of the present application provides a conditional switching device, comprising:
  • a first processing unit configured to switch from the first main base station to the second main base station when the terminal in the dual connection mode performs conditional handover
  • a sending unit configured to obtain a list of candidate cells, and send the list of candidate cells to the second master base station;
  • the list of candidate cells represents a group of secondary cells configured when the first secondary base station performs CPC configuration on the terminal;
  • the candidate cell list is used for the second master base station to establish a communication interface with each cell in the candidate cell list under the condition of reserving the first secondary base station, so that the second master base station can communicate with each other.
  • the first secondary base station jointly provides a dual connectivity service for the terminal.
  • At least one embodiment of the present application provides a conditional switching device, comprising:
  • an obtaining unit configured to obtain a list of candidate cells from the first secondary base station when the terminal in the dual connectivity mode performs conditional handover from the first primary base station to the second primary base station;
  • the candidate cell list represents the first secondary base station a secondary cell group configured when performing CPC configuration on the terminal;
  • a second processing unit configured to establish a communication interface with each cell in the candidate cell list under the condition of reserving the first secondary base station, so that the second primary base station and the first secondary base station are jointly
  • the terminal provides dual connection service.
  • At least one embodiment of the present application provides a terminal, including:
  • a first processor configured to switch from the first main base station to the second main base station when the terminal in the dual connection mode performs conditional handover
  • the first communication interface is used to obtain a list of candidate cells and send the list of candidate cells to the second master base station; the list of candidate cells represents the secondary cells configured when the first secondary base station performs CPC configuration on the terminal Group;
  • the candidate cell list is used for the second master base station to establish a communication interface with each cell in the candidate cell list under the condition of reserving the first secondary base station, so that the second master base station can communicate with each other.
  • the first secondary base station jointly provides a dual connectivity service for the terminal.
  • At least one embodiment of the present application provides a network device, including:
  • the second communication interface is configured to acquire a candidate cell list from the first secondary base station when the terminal in dual connectivity mode performs conditional handover from the first primary base station to the second primary base station;
  • the candidate cell list represents the first primary base station a secondary cell group configured when the secondary base station performs CPC configuration on the terminal;
  • a second processor configured to establish a communication interface with each cell in the candidate cell list under the condition of reserving the first secondary base station, so that the second primary base station and the first secondary base station are jointly
  • the terminal provides dual connection service.
  • At least one embodiment of the present application provides a terminal including a processor and a memory for storing a computer program executable on the processor,
  • the processor is configured to execute the steps of any one of the methods described above on the terminal side when running the computer program.
  • At least one embodiment of the present application provides a network device including a processor and a memory for storing a computer program executable on the processor,
  • the processor is configured to execute the steps of any one of the methods on the network device side when running the computer program.
  • At least one embodiment of the present application provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, implements the steps of any of the foregoing methods.
  • conditional handover method when a terminal in dual connectivity mode performs conditional handover, the terminal is handed over from the first primary base station to the second primary base station; the terminal acquires candidate cells list, and send the candidate cell list to the second primary base station; the candidate cell list represents the secondary cell group configured when the first secondary base station performs CPC configuration on the terminal; wherein, the candidate cell list uses In order for the second master base station to establish a communication interface with each cell in the candidate cell list under the condition of reserving the first secondary base station, so that the second master base station and the first secondary base station together are The terminal provides dual connectivity services.
  • CHO is triggered first, that is, the terminal is switched from the first main base station to the second
  • the primary base station if the second primary base station keeps the original secondary base station unchanged, the terminal will actively report the candidate cell list to the second primary base station, which can facilitate the establishment of the node where the candidate cell is located for the CPC configuration between the second primary base station and the original secondary base station. communication interface, so that the second primary base station and the original secondary base station can provide dual-connection services to the terminal in time to avoid interruption of dual-connection services.
  • Fig. 1 is the realization flow schematic diagram of terminal handover in the related art
  • FIG. 2 is a schematic flowchart of an implementation of a first conditional switching method according to an embodiment of the present application
  • FIG. 3 is a schematic flowchart of the implementation of ensuring the dual connection service of the terminal when the terminal under the first dual connection mode of the embodiment of the present application undergoes condition switching;
  • FIG. 4 is a schematic flowchart of the implementation of ensuring the dual connection service of the terminal when the terminal under the second dual connection mode according to the embodiment of the present application is switched between conditions;
  • FIG. 5 is a schematic flowchart of an implementation of a second conditional switching method according to an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of the implementation of ensuring the dual-connection service of the terminal when the terminal initiates a conditional switch in a third dual-connection mode according to an embodiment of the present application;
  • FIG. 7 is a schematic diagram of the composition and structure of a first condition switching device according to an embodiment of the present application.
  • FIG. 8 is a schematic diagram of the composition and structure of a second condition switching device according to an embodiment of the present application.
  • FIG. 9 is a schematic diagram of the composition and structure of a condition switching system according to an embodiment of the present application.
  • FIG. 10 is a schematic diagram of a composition structure of a terminal according to an embodiment of the present application.
  • FIG. 11 is a schematic diagram of the composition and structure of a network device according to an embodiment of the present application.
  • the terminal can establish an air interface connection with the main base station (also called the master node (MN, Master Node)), so as to realize the communication with the master base station; the terminal can also communicate with the secondary base station (also called the secondary node (SN)) , Secondary Node)) to establish an air interface connection, so as to realize the communication with the secondary base station; the terminal can also establish an air interface connection with the primary base station and the secondary base station at the same time, so as to realize the communication with the primary base station and the secondary base station at the same time.
  • MN master node
  • SN secondary node
  • the terminal can establish an air interface connection with the primary base station and the secondary base station at the same time, so as to realize the communication with the primary base station and the secondary base station at the same time.
  • the terminal establishes two connections with the primary base station and the secondary base station at the same time, wherein the primary base station is mainly responsible for transmitting signaling, and the secondary base station is responsible for transmitting data.
  • the technical solutions of the embodiments of the present application are mainly aimed at terminals in a dual connection mode.
  • CHO can be configured, that is, the main base station can configure the threshold for triggering handover for the terminal and the random access resources used by the terminal in the potential target cell. Once the handover threshold is satisfied, the terminal sends the target The base station initiates the random access procedure without triggering measurement reporting and waiting for the network to issue a handover command.
  • the CPC can also be configured, that is, the conditions for triggering the PScell change, and the secondary cell group (SCG) connected with the terminal can be configured.
  • SCG secondary cell group
  • the network can configure CHO and CPC for it, and the order of the two is not fixed.
  • CPC can be configured first and then CHO, or CHO can be configured first and then CPC.
  • Fig. 1 is a schematic diagram of the implementation flow of terminal handover in the related art.
  • the target base station for a terminal in dual-connection mode, for example, for an MR-DC terminal, when handover occurs, the target base station (target MN) can be the The terminal adds a new SN, can also retain the original SN for the terminal, and can also delete the original SN for the terminal, that is, the target base station can decide whether to retain/change/delete the serving SN. Retaining the original SN may mean that the target SN and the source SN are the same SN.
  • CPC-related configuration will not be carried when configuring CHO on the network.
  • both CHO and CPC are configured.
  • the target cell retains the original SN after the UE switches to the target cell, the target cell does not know the CPC of the original SN because the target cell does not know the CPC of the original SN.
  • Configuration the new MN does not establish an Xn port with the original SN to add candidate SN cells, so the new MN cannot cooperate with the original SN, resulting in the problem that the terminal cannot continue to receive dual connectivity services.
  • the terminal when a terminal in dual connectivity mode performs conditional handover, the terminal is handed over from the first main base station to the second main base station; the terminal obtains a list of candidate cells, and converts the The candidate cell list is sent to the second primary base station; the candidate cell list represents the secondary cell group configured when the first secondary base station performs CPC configuration on the terminal; wherein the candidate cell list is used for the second primary base station Under the condition that the first secondary base station is reserved, the primary base station establishes a communication interface with each cell in the candidate cell list, so that the second primary base station and the first secondary base station jointly provide dual connectivity for the terminal Serve.
  • the terminal actively reports the candidate cell list to the second primary base station, that is, notifies the target base station of the existing candidate cell list configured by the CPC, so that the second primary base station can
  • the base station (new MN) establishes a communication interface with the node where the candidate cell of the original SN is located, or notifies the second master base station (new MN) through the original SN, that is, notifies the target base station of the list of candidate cells configured by the existing CPC, so that The second master base station (new MN) establishes a communication interface with the node where the candidate cell of the original SN is located.
  • An embodiment of the present application provides a conditional switching method, which is applied to a terminal. As shown in FIG. 2 , the method includes:
  • Step 201 When the terminal in the dual connectivity mode performs the conditional handover, the terminal is handed over from the first main base station to the second main base station.
  • Step 202 The terminal acquires a list of candidate cells, and sends the list of candidate cells to the second primary base station.
  • the candidate cell list represents the secondary cell group configured when the first secondary base station performs CPC configuration on the terminal; wherein, the candidate cell list is used for the second primary base station to reserve the first secondary base station In the case of , establish a communication interface with each cell in the candidate cell list, so that the second primary base station and the first secondary base station jointly provide a dual-connectivity service for the terminal.
  • the conditional handover configuration may mean that the terminal does not need to trigger measurement reporting and wait for the network to issue a handover instruction to implement handover, but instead judges whether there is a conditional handover candidate cell that satisfies the execution conditions of the conditional handover configuration If there is a cell that satisfies the conditional handover configuration execution condition in the conditional handover candidate cells, the cell is used as the target cell to access the second master base station.
  • step 202 in practical application, by first triggering CHO, the terminal is switched from the first primary base station to the second primary base station, and in the case that the second primary base station keeps the original secondary base station (original SN) unchanged, the terminal actively The candidate cell list is reported to the second master base station, so that the second master base station (new MN) establishes a communication interface with the node where the candidate cell of the original SN is located, so that the new MN and the original SN can jointly provide dual connectivity services for the terminal.
  • new MN new MN
  • establishing a communication interface may refer to establishing an Xn interface between the second master base station and a node corresponding to each cell in the candidate cell list respectively.
  • the terminal is a terminal in a dual connection mode in which both CPC and CHO are configured.
  • the terminal when a conditional switch occurs, the terminal is switched from the original MN to the new MN. If the new MN does not delete or change the original SN, that is, the new MN retains the original SN. In this case, the terminal actively reports the list of candidate cells configured by the existing CPC to the new MN, which can ensure that the new MN establishes a communication interface with the cells of the original SN in time, so that the new MN and the original SN jointly provide dual-connection services for the terminal, ensuring dual connectivity. Connection service is not interrupted.
  • the sending the candidate cell list to the second master base station includes:
  • the terminal sends the first information to the second primary base station.
  • the candidate cell list may represent the secondary cell group configured when the first secondary base station performs CPC configuration on the terminal.
  • the CPC configuration may refer to a condition for triggering PScell change.
  • the PScell is the first cell connected in the SCG after the terminal establishes the connection with the first secondary base station, that is, the secondary cell group (SCG) under the original SN.
  • the SCG may include a PScell and a plurality of SCells, and the SCells are other cells in the SCG except the PScell.
  • Table 1 is a schematic diagram of the candidate cell list.
  • the SCG configured by the first secondary base station for the CPC configuration for the terminal includes 5 cells, namely Pscell, SCell1, SCell2, SCell3 and SCell4.
  • the terminal sends the candidate cell list to the second master base station in the following two ways:
  • the terminal After the terminal accesses the second main base station, that is, the new MN, the terminal sends a reconfiguration complete message to the new MN; the reconfiguration complete message carries the candidate cell list.
  • the terminal After the terminal accesses the second primary base station, that is, the new MN, the terminal sends a Radio Resource Control (RRC, Radio Resource Control) message to the MN; the RRC message carries the candidate cell list.
  • RRC Radio Resource Control
  • the first master base station can configure conditional handover for the terminal, and the terminal can actively initiate handover to the second master base station if the conditional handover is satisfied.
  • the terminal in the dual connectivity mode performs conditional handover, the terminal is handed over from the first primary base station to the second primary base station, including:
  • the terminal determines, from a plurality of conditional handover candidate cells, a plurality of candidate cells that satisfy the execution conditions in the conditional handover configuration;
  • the terminal selects a target cell from the plurality of candidate cells to access the second primary base station.
  • conditional handover configuration may mean that the terminal does not need to trigger measurement reporting and wait for the network to issue a handover instruction to implement handover, but instead evaluates whether the conditional handover candidate cell satisfies the execution conditions in the conditional handover configuration.
  • the execution condition may refer to a measurement threshold reached when the candidate cell satisfies the conditional handover.
  • the candidate cells are represented by cell 1, cell 2, and cell 3
  • the measurement value of cell 1 is 10dB
  • the measurement value of cell 2 is 20dB
  • the measurement value of cell 3 is 30dB.
  • the corresponding measurement threshold is 15dB
  • the cell 2 and the cell 3 satisfy the execution condition, and the terminal can select one cell from the cell 2 and the cell 3 as the target cell.
  • the terminal will configure the candidate cell group for the CPC. If the release is not performed, it can be ensured that the new MN can establish a communication interface with the candidate cells of the original SN in time after obtaining the list of candidate cells for the CPC configuration of the original SN, thereby jointly providing dual connectivity services for the terminal.
  • the method further includes:
  • the CPC configuration is not released.
  • not releasing the CPC configuration may mean that the terminal maintains uninterrupted connection to each cell in the candidate cell group in which the CPC configuration is performed with the first secondary base station, that is, the original SN.
  • Step 301 When the terminal in the dual connection mode performs CHO, the terminal is handed over from the first main base station to the second main base station.
  • the first primary base station that is, the original MN
  • the first secondary base station that is, the original SN
  • Step 302 The terminal acquires a list of candidate cells for the first secondary base station to perform CPC configuration.
  • the candidate cell list may refer to the first secondary base station, that is, the secondary cell group in which the original SN performs CPC configuration for the terminal.
  • Step 303 The terminal carries the candidate cell list in first information; and sends the first information to the second primary base station.
  • Step 304 In the case of reserving the first secondary base station, the second primary base station establishes a communication interface with each cell in the candidate cell list, so that the second primary base station and the first secondary base station jointly A dual-connection service is provided for the terminal.
  • the terminal actively reports the candidate cell list to the second master base station, which has the following advantages:
  • the second primary base station namely the target MN, obtains the candidate cell list of the CPC configuration of the corresponding first secondary base station, namely the original SN, only after the terminal successfully accesses, which can reduce the number of gaps between the first primary base station, the original MN and the target MN in the early stage. Interaction signaling overhead.
  • the target MN can establish Xn as soon as possible with the candidate cell for the CPC configuration of the original SN, so as to avoid the situation that the target SN cannot access when the CPC condition is satisfied.
  • CHO is triggered first, and the terminal is switched from the first main base station to the second main base station.
  • the second main base station keeps the first secondary base station (original SN) unchanged
  • the second main base station obtains the information reported by the terminal.
  • a communication interface can be established with the node where the candidate cell of the original SN is located.
  • the node where the candidate cell of the original SN is located may establish a communication interface with the second primary base station, or may refuse to establish a communication interface with the second primary base station.
  • the second master base station may update the candidate cell list, and/or, the candidate cell is the random access resource reserved for the terminal to update. For example, delete some candidate cells in the candidate cell list for which the Xn port cannot be established; or, refuse to establish a candidate cell with the Xn port with the second base station; or, configure and update the random access resources reserved for the terminal by the configured candidate cells .
  • the method further includes:
  • the terminal receives the updated candidate cell list sent by the second master base station; wherein, the updated candidate cell list is when the second master base station refuses to establish a communication interface with a cell in the candidate cell list, Obtained by updating the CPC configuration;
  • the terminal receives the updated random access configuration sent by the second master base station; wherein, the random access configuration is that at least one cell in the candidate cell list that establishes a communication interface with the second master base station is: Obtained by updating the random access resources reserved by the terminal.
  • the cells in the candidate cell list may refuse to establish a communication interface with the second master base station in some cases, such as a case of full load.
  • the cell PScell and the cell SCell4 agree to establish the Xn port with the second master base station, and the cell SCell1, the cell SCell2 and the cell SCell3 refuse to establish the Xn port with the second master base station.
  • the second master base station may update the candidate cell list for the first secondary base station to perform the CPC configuration, That is, the cell that refuses to establish the communication interface is deleted from the candidate cell list. In this way, after receiving the updated candidate cell list sent by the second master base station, the terminal does not need to measure cells in the candidate cell list that refuse to establish a connection with the second master base station, thereby saving resources.
  • the candidate cell list can update the random access resources reserved for the terminal, that is, can establish The cell of the communication interface updates the random access resources reserved for the terminal. In this way, after receiving the updated random access configuration sent by the primary base station, the terminal initiates random access according to the latest random access resources, thereby avoiding initiating unnecessary/erroneous random access procedures.
  • Step 401 The first master base station (original MN) configures CHO for the terminal.
  • the first master base station (original MN) sends a conditional handover request to the potential target MN(s); after receiving the conditional handover request from the original MN, the potential target MN executes 401b, that is, adds the original SN. After that, the first master base station (original MN) sends the CHO configuration to the terminal through RRC reconfiguration, and the terminal evaluates whether the conditional handover candidate cell satisfies the execution conditions in the CHO configuration, that is, executes 401a.
  • step 401b can occur before 401a or after 401a.
  • the terminal is in a dual-connection mode, and the first primary base station (original MN) and the first secondary base station (original SN) jointly provide dual-connection services for the terminal.
  • Step 402 The first secondary base station (original SN) configures the CPC for the terminal.
  • the process that the first secondary base station (original SN) decides to configure the CPC for the terminal may include: the first secondary base station (original SN) generates corresponding execution conditions for each candidate cell and sends it to the first primary base station (original MN), the first The master base station (original MN) generates the CPC configuration after acquiring the configuration of the CPC candidate cell, and configures it to the terminal through the RRC reconfiguration message, and the terminal evaluates whether the candidate cell satisfies the execution conditions in the CPC configuration.
  • the CPC configuration can be delivered before the CHO, or after the CHO, or delivered to the terminal by the first master base station (original MN) through the same RRC reconfiguration message.
  • Step 403 When the target cell satisfies the execution conditions in the CHO configuration, the terminal initiates access to the target cell, and at the same time, the terminal keeps the CPC configuration from being released.
  • the SN corresponding to the target cell is the original SN.
  • Step 404 After the terminal successfully accesses the second master base station (target MN), it actively reports the candidate cell list to the second master base station (target MN).
  • the terminal may send a reconfiguration complete message to the second primary base station, namely the target MN; the reconfiguration complete message carries the list of candidate cells; or, the terminal sends the list of candidate cells configured by the CPC to the target through a separate uplink RRC message MN.
  • Step 405 The second primary base station (target MN) informs the first primary base station (original MN) that the terminal has been handed over to the second primary base station (target MN); the first primary base station (original MN) notifies other candidate cells to release resources, and sends the The first secondary base station (original SN) sends a reconfiguration complete message.
  • Step 406 The second master base station (target MN) adds a corresponding node based on the candidate cell list of the CPC configuration fed back by the terminal, and establishes an Xn interface.
  • step 406 can occur before or after step 405,
  • the node where the CPC candidate cell is located may establish an Xn interface with the target MN, or reject, or update the configuration.
  • Step 407 When the candidate cell refuses to establish the Xn interface with the second master base station (target MN), the second master base station (target MN) updates the CPC configuration candidate cell list and/or the corresponding random access configuration for the terminal.
  • the terminal in dual connectivity mode initiates a conditional handover, the terminal actively reports the candidate cell list to the second master base station, which has the following advantages:
  • the second master base station may update the CPC configuration to delete the candidate cell and/or the candidate cell as a terminal Reserved random access resources, so as to avoid the situation where the second master base station (target MN)/original SN performs CPC reconfiguration again according to the measurement of the candidate cell by the terminal, and it may be a CPC candidate cell that has been configured by the original SN , thereby avoiding the occurrence of problems such as the waste of terminal power consumption and the increase of CPC configuration delay caused by the need to reconfigure the CPC in the network and the repeated measurement of the terminal.
  • CHO when CHO is triggered first, that is, the terminal is switched from the first main base station to the second main base station, if the second main base station In the case of keeping the original secondary base station unchanged, the terminal actively reports the candidate cell list to the second primary base station, which can facilitate the second primary base station and the original secondary base station to establish a communication interface with the node where the candidate cell of the CPC configuration is located, so that the second primary base station can establish a communication interface.
  • the original and secondary base stations can provide dual-connection services to terminals in time to avoid interruption of dual-connection services.
  • the embodiment of the present application provides a conditional handover method, which is applied to the second master base station. As shown in FIG. 5 , the method includes:
  • Step 501 When the terminal in the dual connectivity mode performs the conditional handover from the first master base station to the second master base station, the second master base station acquires a candidate cell list from the first secondary base station.
  • Step 502 In the case of reserving the first secondary base station, the second primary base station establishes a communication interface with each cell in the candidate cell list, so that the second primary base station and the first secondary base station jointly A dual-connection service is provided for the terminal.
  • the candidate cell list represents a secondary cell group configured when the first secondary base station performs CPC configuration on the terminal.
  • the conditional handover configuration may mean that the terminal does not need to trigger measurement reporting and wait for the network to issue a handover instruction to implement handover, but instead judges whether there is a conditional handover candidate cell that satisfies the execution conditions of the conditional handover configuration If there is a cell that satisfies the conditional handover configuration execution condition in the conditional handover candidate cells, the cell is used as the target cell to access the second master base station. By triggering CHO first, the terminal is switched from the first primary base station to the second primary base station.
  • the second primary base station keeps the original secondary base station (original SN) unchanged
  • the second primary base station obtains candidates from the first secondary base station cell list, so that the second master base station (new MN) establishes a communication interface with the node where the candidate cell of the original SN is located, so that the new MN and the original SN can jointly provide dual connectivity services for the terminal.
  • the terminal is switched from the first main base station to the second main base station.
  • the second main base station keeps the first secondary base station (original SN) unchanged
  • the second main base station actively switches from the first main base station to the second main base station.
  • the secondary base station acquires the candidate cell list, so that the second primary base station (new MN) establishes a communication interface with the node where the candidate cell of the original SN is located, so that the new MN and the original SN can jointly provide dual connectivity services for the terminal.
  • the terminal is switched from the first primary base station to the second primary base station, and in the case that the second primary base station keeps the first secondary base station (original SN) unchanged, the first secondary base station actively sends the candidate cell list To the second master base station, so that the second master base station (new MN) establishes a communication interface with the node where the candidate cell of the original SN is located, so that the new MN and the original SN can jointly provide dual connectivity services for the terminal.
  • the second primary base station keeps the first secondary base station (original SN) unchanged
  • the first secondary base station actively sends the candidate cell list To the second master base station, so that the second master base station (new MN) establishes a communication interface with the node where the candidate cell of the original SN is located, so that the new MN and the original SN can jointly provide dual connectivity services for the terminal.
  • the second primary base station acquires a candidate cell list from the first secondary base station, including one of the following:
  • the second primary base station After the terminal switches to the second primary base station, the second primary base station sends second information to the first secondary base station; the second information is used to instruct the first secondary base station to send the first secondary base station to the first secondary base station.
  • the second master base station sends the candidate cell list; the second master base station receives the candidate cell list sent by the first secondary base station;
  • the second master base station After the terminal switches to the second master base station, the second master base station receives the candidate cell list sent by the first secondary base station.
  • CHO is triggered first, and the terminal is switched from the first main base station to the second main base station.
  • the second main base station keeps the first secondary base station (original SN) unchanged
  • the second main base station obtains the information reported by the terminal.
  • a communication interface can be established with the node where the candidate cell of the original SN is located.
  • the node where the candidate cell of the original SN is located may establish a communication interface with the second primary base station, or may refuse to establish a communication interface with the second primary base station.
  • the second master base station may update the candidate cell list, and/or, the candidate cell is the random access resource reserved for the terminal to update.
  • the method further includes:
  • the second main base station sends the updated candidate cell list to the terminal; wherein, the updated candidate cell list is a response to when the second main base station refuses to establish a communication interface with a cell in the candidate cell list. Obtained by updating the CPC configuration;
  • the second master base station sends the updated random access configuration to the terminal; wherein, the random access configuration is that at least one cell in the candidate cell list that establishes a communication interface with the second master base station is the obtained by updating the random access resources reserved by the terminal.
  • Step 601 The first master base station (original MN) configures CHO for the terminal.
  • the first master base station (original MN) sends a conditional handover request to the potential target MN(s); after receiving the conditional handover request from the original MN, the potential target MN executes 601b, that is, adds the original SN. After that, the first master base station (original MN) sends the CHO configuration to the terminal through the RRC reconfiguration message, and the terminal evaluates whether the conditional handover candidate cell satisfies the execution conditions in the CHO configuration, that is, executes 601a.
  • step 601b can occur before 601a or after 601a.
  • the terminal is in a dual-connection mode, and the first primary base station (original MN) and the first secondary base station (original SN) jointly provide dual-connection services for the terminal.
  • Step 602 The first secondary base station (original SN) configures the CPC for the terminal.
  • the process that the first secondary base station (original SN) decides to configure the CPC for the terminal may include: the first secondary base station (original SN) generates corresponding execution conditions for each candidate cell and sends it to the first primary base station (original MN), the first The master base station (original MN) generates the CPC configuration after acquiring the configuration of the CPC candidate cell, and configures it to the terminal through the RRC reconfiguration message, and the terminal evaluates whether the candidate cell satisfies the execution conditions in the CPC configuration.
  • the CPC configuration can be delivered before the CHO, or after the CHO, or delivered to the terminal by the first master base station (original MN) through the same RRC reconfiguration message.
  • Step 603 When the target cell satisfies the execution conditions in the CHO configuration, the terminal initiates access to the target cell, and at the same time, the terminal keeps the CPC configuration from being released.
  • the SN corresponding to the target cell is the original SN.
  • Step 604 The second master base station (target MN) notifies the first master base station (original MN) that the terminal has been handed over to the second master base station (target MN); the first master base station (original MN) notifies other candidate cells (candidate MNs) to release resource.
  • Step 605 After the terminal successfully accesses the second primary base station (target MN), the second primary base station (target MN) sends a reconfiguration complete message to the first secondary base station (original SN); the reconfiguration complete message carries indication information , which is used to query the candidate cell list of the original SN for CPC configuration;
  • Step 606 The first secondary base station (original SN) feeds back the candidate cell list to the second primary base station (target MN).
  • step 606 may be based on the indication information of step 605, or may be, after receiving the reconfiguration complete message sent by the second primary base station (target MN), the first secondary base station (original SN) will actively The cell list is fed back to the second master base station (target MN).
  • Step 607 The second primary base station (target MN) adds a corresponding node based on the candidate cell list of the CPC configuration fed back by the first secondary base station (original SN), and establishes an Xn interface.
  • the node where the candidate cell configured by the CPC is located may establish an Xn interface with the target MN, or reject, or update the configuration.
  • Step 608 When the candidate cell refuses to establish the Xn interface with the second master base station (target MN), the second master base station (target MN) updates the CPC configuration candidate cell list and/or the corresponding random access configuration for the terminal.
  • the second primary base station obtains the candidate cell list from the first secondary base station, which has the following advantages:
  • target MN For a terminal in dual-connection mode (DC) where both CHO and CPC are configured, when the target cell selected by the terminal retains the original SN, after the terminal successfully accesses the target cell, the original SN takes the initiative to send to the target cell.
  • the second master base station (target MN) sends a list of candidate cells for the CPC configuration, and the terminal does not release the CPC configuration triggered by the original SN, so that the second master base station (target MN) can obtain the CPC configuration of the original SN and establish with the CPC candidate cells in advance Xn port, so that the target MN and the original SN can jointly provide dual-connection services.
  • the second master base station may update the CPC configuration to delete the candidate cell and/or the candidate cell as a terminal Reserved random access resources, so as to avoid the situation where the second master base station (target MN)/original SN performs CPC reconfiguration again according to the measurement of the candidate cell by the terminal, and it may be a CPC candidate cell that has been configured by the original SN , thereby avoiding the occurrence of problems such as the waste of terminal power consumption and the increase of CPC configuration delay caused by the need to reconfigure the CPC in the network and the repeated measurement of the terminal.
  • CHO when CHO is triggered first, that is, the terminal is switched from the first main base station to the second main base station, if the second main base station In the case of keeping the original secondary base station unchanged, the second primary base station obtains the candidate cell list from the first secondary base station, which can facilitate the second primary base station and the original secondary base station (first secondary base station) to perform CPC configuration of the node where the candidate cell is located A communication interface is established, so that the second primary base station and the original secondary base station can provide a dual-connection service to the terminal in time to avoid interruption of the dual-connection service.
  • FIG. 7 is a schematic diagram of the composition and structure of the conditional switching device of the embodiment of the present application;
  • the device includes:
  • the first processing unit 71 is configured to switch from the first main base station to the second main base station when the terminal in the dual connection mode performs the conditional handover;
  • a sending unit 72 configured to obtain a list of candidate cells, and send the list of candidate cells to the second primary base station; the list of candidate cells represents when the first secondary base station performs a conditional PScell change CPC configuration on the terminal The configured secondary cell group;
  • the candidate cell list is used for the second master base station to establish a communication interface with each cell in the candidate cell list under the condition of reserving the first secondary base station, so that the second master base station can communicate with each other.
  • the first secondary base station jointly provides a dual connectivity service for the terminal.
  • the sending unit 72 is specifically configured to:
  • the terminal sends the first information to the second primary base station.
  • the first processing unit 71 is specifically configured to:
  • the terminal determines, from a plurality of conditional handover candidate cells, a plurality of candidate cells that satisfy the execution conditions in the conditional handover configuration;
  • the terminal selects a target cell from the plurality of candidate cells to access the second primary base station.
  • the method further includes:
  • the CPC configuration is not released.
  • the apparatus further includes:
  • a receiving unit configured to receive the updated candidate cell list sent by the second master base station; wherein the updated candidate cell list is when the second master base station refuses to establish a communication interface with a cell in the candidate cell list is obtained by updating the CPC configuration;
  • the random access configuration is that at least one cell in the candidate cell list that establishes a communication interface with the second master base station is the terminal It is obtained by updating the reserved random access resources.
  • the sending unit 72 and the receiving unit may be implemented by a communication interface in the condition switching apparatus; the first processing unit 71 may be implemented by a processor in the condition switching apparatus.
  • condition switching device when the condition switching device provided in the above embodiment performs the condition switching, only the division of the above program modules is used as an example for illustration. That is, the internal structure of the device is divided into different program modules to complete all or part of the processing described above.
  • conditional switching apparatus provided in the above embodiments and the conditional switching method embodiments belong to the same concept, and the specific implementation process thereof is detailed in the method embodiments, which will not be repeated here.
  • the embodiment of the present application further provides a conditional switching device, which is arranged on the second main base station.
  • the device includes:
  • the obtaining unit 81 is configured to obtain a list of candidate cells from the first secondary base station when the terminal in dual connectivity mode performs conditional handover from the first primary base station to the second primary base station; the candidate cell list represents the first secondary base station a secondary cell group configured when the base station performs CPC configuration on the terminal;
  • the second processing unit 82 is configured to establish a communication interface with each cell in the candidate cell list under the condition of reserving the first secondary base station, so that the second primary base station and the first secondary base station are jointly
  • the terminal provides dual connectivity services.
  • the obtaining unit 81 is specifically configured to perform one of the following operations:
  • the second primary base station After the terminal switches to the second primary base station, the second primary base station sends second information to the first secondary base station; the second information is used to instruct the first secondary base station to send the first secondary base station to the first secondary base station.
  • the second master base station sends the candidate cell list; the second master base station receives the candidate cell list sent by the first secondary base station;
  • the second master base station After the terminal switches to the second master base station, the second master base station receives the candidate cell list sent by the first secondary base station.
  • the second processing unit 82 is further configured to:
  • the updated candidate cell list is obtained by updating the CPC configuration when the second master base station is refused to establish a communication interface with a cell in the candidate cell list ;
  • the random access configuration is a random access configuration reserved for the terminal by at least one cell in the candidate cell list that establishes a communication interface with the second primary base station It is obtained by accessing the resource for updating.
  • the obtaining unit 81 may be implemented by a communication interface in the condition switching apparatus; the second processing unit 82 may be implemented by a processor in the condition switching apparatus.
  • condition switching device when the condition switching device provided in the above embodiment performs the condition switching, only the division of the above program modules is used as an example for illustration. That is, the internal structure of the device is divided into different program modules to complete all or part of the processing described above.
  • conditional switching apparatus provided in the above embodiments and the conditional switching method embodiments belong to the same concept, and the specific implementation process thereof is detailed in the method embodiments, which will not be repeated here.
  • FIG. 9 is a schematic diagram of the composition and structure of the conditional switching system according to the embodiment of the present application; as shown in FIG. 9 , the system includes:
  • the terminal 91 is configured to switch from the first main base station to the second main base station when the terminal in the dual connectivity mode performs the conditional handover; obtain a list of candidate cells, and send the list of candidate cells to the second main base station;
  • the second master base station 92 is configured to establish a communication interface with each cell in the candidate cell list under the condition of reserving the first secondary base station, so that the second master base station and the first secondary base station jointly serve as the The terminal provides dual connection service.
  • the embodiment of the present application also provides a terminal, as shown in FIG. 10 , including:
  • the first communication interface 101 capable of information interaction with other devices
  • the first processor 102 is connected to the first communication interface 101, and is configured to execute the methods provided by one or more technical solutions on the terminal side when running the computer program. And the computer program is stored on the first memory 103 .
  • bus system 104 is used to implement connection communication between these components.
  • bus system 104 also includes a power bus, a control bus, and a status signal bus.
  • the various buses are labeled as bus system 104 in FIG. 10 .
  • the first memory 103 in this embodiment of the present application is used to store various types of data to support the operation of the controller 110 .
  • Examples of such data include: any computer program used to operate on the terminal.
  • the methods disclosed in the above embodiments of the present application may be applied to the first processor 102 or implemented by the first processor 102 .
  • the first processor 102 may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above-mentioned method may be completed by an integrated logic circuit of hardware in the first processor 102 or an instruction in the form of software.
  • the above-mentioned first processor 102 may be a general-purpose processor, a digital data processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like.
  • the first processor 102 may implement or execute the methods, steps, and logical block diagrams disclosed in the embodiments of this application.
  • a general purpose processor may be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor.
  • the software module may be located in a storage medium, and the storage medium is located in the first memory 103, and the first processor 102 reads the information in the first memory 103, and completes the steps of the foregoing method in combination with its hardware.
  • the embodiment of the present application also provides a network device, as shown in FIG. 11 , including:
  • the second communication interface 111 is capable of information interaction with other devices
  • the second processor 112 is connected to the second communication interface 111, and is configured to execute the methods provided by one or more technical solutions on the network device side when running the computer program. And the computer program is stored on the second memory 113.
  • bus system 114 is used to implement the connection communication between these components.
  • bus system 114 also includes a power bus, a control bus, and a status signal bus.
  • the various buses are labeled as bus system 114 in FIG. 11 .
  • the second memory 113 in this embodiment of the present application is used to store various types of data to support the operation of the network device 110 .
  • Examples of such data include: any computer program used to operate on a network device.
  • the methods disclosed in the above embodiments of the present application may be applied to the second processor 112 or implemented by the second processor 112 .
  • the second processor 112 may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above-mentioned method may be completed by an integrated logic circuit of hardware in the second processor 112 or an instruction in the form of software.
  • the above-mentioned second processor 112 may be a general-purpose processor, a digital data processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like.
  • DSP Digital Signal Processor
  • the second processor 112 may implement or execute the methods, steps, and logical block diagrams disclosed in the embodiments of this application.
  • a general purpose processor may be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor.
  • the software module may be located in a storage medium, and the storage medium is located in the second memory 113, and the second processor 112 reads the information in the second memory 113, and completes the steps of the foregoing method in combination with its hardware.
  • a terminal and a network device may be implemented by one or more Application Specific Integrated Circuits (ASIC, Application Specific Integrated Circuit), DSP, Programmable Logic Device (PLD, Programmable Logic Device), Complex Programmable Logic Device (CPLD, Complex Programmable Logic Device), Field Programmable Gate Array (FPGA, Field-Programmable Gate Array), general-purpose processor, controller, microcontroller (MCU, Micro Controller Unit), microprocessor (Microprocessor), or other Electronic components are implemented for carrying out the aforementioned method.
  • ASIC Application Specific Integrated Circuit
  • DSP Programmable Logic Device
  • PLD Programmable Logic Device
  • CPLD Complex Programmable Logic Device
  • FPGA Field Programmable Gate Array
  • MCU microcontroller
  • Microcontroller Micro Controller Unit
  • Microprocessor Microprocessor
  • the memory in this embodiment of the present application may be a volatile memory or a nonvolatile memory, and may also include both volatile and nonvolatile memory.
  • the non-volatile memory can be a read-only memory (ROM, Read Only Memory), a programmable read-only memory (PROM, Programmable Read-Only Memory), an erasable programmable read-only memory (EPROM, Erasable Programmable Read-only memory) Only Memory), Electrically Erasable Programmable Read-Only Memory (EEPROM, Electrically Erasable Programmable Read-Only Memory), Magnetic Random Access Memory (FRAM, ferromagnetic random access memory), Flash Memory (Flash Memory), Magnetic Surface Memory , CD-ROM, or CD-ROM (Compact Disc Read-Only Memory); magnetic surface memory can be disk memory or tape memory.
  • RAM Random Access Memory
  • SRAM Static Random Access Memory
  • SSRAM Synchronous Static Random Access Memory
  • DRAM Dynamic Random Access Memory
  • SDRAM Synchronous Dynamic Random Access Memory
  • DDRSDRAM Double Data Rate Synchronous Dynamic Random Access Memory
  • ESDRAM Double Data Rate Synchronous Dynamic Random Access Memory
  • ESDRAM Enhanced Type Synchronous Dynamic Random Access Memory
  • SLDRAM Synchronous Link Dynamic Random Access Memory
  • DRRAM Direct Rambus Random Access Memory
  • DRRAM Direct Rambus Random Access Memory
  • an embodiment of the present application further provides a storage medium, that is, a computer storage medium, specifically a computer-readable storage medium, for example, including a first memory 103 that stores a computer program, and the above-mentioned computer program can be stored in the first memory of the terminal.
  • a processor 102 executes to complete the steps of the aforementioned terminal-side method.
  • the computer-readable storage medium may be memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface memory, optical disk, or CD-ROM.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Des modes de réalisation de la présente demande concernent un procédé, un appareil et un dispositif de transfert conditionnel et un support de stockage. Le procédé consiste : lorsqu'un terminal en mode de double connectivité effectue un transfert conditionnel, à transférer le terminal d'une première station de base maîtresse à une seconde station de base maîtresse ; à obtenir, par le terminal, une liste de cellules candidates et à envoyer à la seconde station de base maîtresse la liste de cellules candidates représentant un groupe de cellules secondaires configuré lorsqu'une première station de base secondaire configure une configuration de variation conditionnelle de cellules primaires et secondaires (CPC) sur le terminal. La liste de cellules candidates permet à la seconde station de base maîtresse d'établir une interface de communication avec chaque cellule de la liste de cellules candidates lorsque la seconde station de base maîtresse réserve la première station de base secondaire, afin que la seconde station de base maîtresse et la première station de base secondaire fournissent ensemble au terminal des services à double connectivité.
PCT/CN2022/080747 2021-03-12 2022-03-14 Procédé, appareil et dispositif de transfert conditionnel, et support de stockage WO2022188890A1 (fr)

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