WO2022127731A1 - Procédé de changement de cellule et équipement utilisateur - Google Patents

Procédé de changement de cellule et équipement utilisateur Download PDF

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Publication number
WO2022127731A1
WO2022127731A1 PCT/CN2021/137408 CN2021137408W WO2022127731A1 WO 2022127731 A1 WO2022127731 A1 WO 2022127731A1 CN 2021137408 W CN2021137408 W CN 2021137408W WO 2022127731 A1 WO2022127731 A1 WO 2022127731A1
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Prior art keywords
scg
pscell
message
cell
rrc
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PCT/CN2021/137408
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English (en)
Chinese (zh)
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常宁娟
刘仁茂
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夏普株式会社
常宁娟
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Publication of WO2022127731A1 publication Critical patent/WO2022127731A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Definitions

  • the present disclosure relates to the technical field of wireless communication, and more particularly, to a method for changing a cell and a corresponding user equipment.
  • the 3GPP RAN Working Group is currently conducting a Release 17 research project (see 3GPP document RP-193249 (New WID on further enhancements on Multi-Radio Dual-Connectivity)).
  • one of the research purposes is to implement a dynamic Secondary Cell Group (Secondary Cell Group, SCG) activation/deactivation mechanism.
  • SCG Secondary Cell Group
  • the UE In the deactivated state of the SCG, the UE does not need to perform downlink physical channel monitoring on the serving cell associated with the SCG, nor perform related link status detection or link status reporting, so as to achieve the purpose of power saving.
  • the UE in the SCG deactivated state can perform SCG-related mobility, including performing Radio Resource Management (RRM) measurements for SCG mobility, receiving and performing Radio Resource Control (RRC) reconfiguration message containing synchronous reconfiguration.
  • RRM Radio Resource Management
  • RRC Radio Resource Control
  • the present disclosure proposes a solution to the problem of how to perform SCG mobility under the introduction of an SCG activation/deactivation mechanism in an NR system.
  • the purpose of the embodiments of the present disclosure is to propose a solution to the problem of how to perform SCG mobility, ie, SCG change, when an SCG activation/deactivation mechanism is introduced in an NR system.
  • the embodiments of the present disclosure provide a cell change method performed in a user equipment and a corresponding user equipment.
  • a method for changing a cell including: a user equipment UE, without triggering a random access procedure, performs a PSCell changing procedure for a primary and secondary cell for a secondary cell group SCG; the UE applies configuration in the RRC reconfiguration message for SCG; the UE sets the content in the RRC reconfiguration complete message as a response message, and submits the RRC reconfiguration complete message to the lower layer for transmission; and in the RRC When the reconfiguration complete message is submitted to the lower layer for transmission, or when the UE receives an acknowledgment indication from the network side, the UE considers that the PSCell change is successfully completed, and performs UE operations after the PSCell change is completed.
  • the RRC reconfiguration message may include a synchronization reconfiguration information element.
  • the UE when the RRC reconfiguration complete message is submitted to the lower layer for transmission and the SCG is in a deactivated state, the UE considers that the PSCell change is successfully completed.
  • the confirmation indication may be used to inform the UE that the PSCell change is completed, or to inform the UE that the network side successfully receives the RRC reconfiguration complete message.
  • the UE may perform the PSCell change process when receiving an RRC message including a PSCell change command from the network side.
  • the UE operation may include at least one of the following operations: (1) stop the T304 timer corresponding to the SCG; (2) stop the radio link failure monitoring corresponding to the source PSCell Timer T310; (3) the application does not require the UE to know the configuration of the system frame number SFN of the target PSCell; (4) after acquiring the SFN of the target PSCell, the application requires the UE to know the measurement and radio resources of the SFN of the target PSCell Configuration part; (5) If the UE is configured for the conditional reconfiguration of the SCG, perform operations related to removing the saved conditional reconfiguration; (6) If the UE sends a message within the last 1 second If the UEAssistanceInformation of the UEAssistanceInformation of the source SCG is received, and the UE is still configured to provide the relevant UE assistance information in the target SCG, the UEAssistanceInformation RRC message of the cell group is sent to provide the target PSCell with the
  • a method for changing a cell including: a user equipment UE performs CPC evaluation of a conditional primary and secondary cell PSCell change, and confirms whether the execution conditions corresponding to the stored CPC candidate cells are satisfied; the UE Selecting a target PSCell from a trigger cell that satisfies execution conditions; the UE performs CPC configuration on the target PSCell; and the UE sets the content of the RRC reconfiguration complete message as a response message, and generates the RRC reconfiguration complete message, when the secondary cell group SCG is in a deactivated state, the UE embeds the RRC reconfiguration complete message in an outer message and delivers it to the lower layer through SRB1 for transmission.
  • the outer layer message may be a ULInformationTransferMRDC message.
  • a user equipment comprising: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, execute the cell changing method according to the context.
  • FIG. 1 is a flowchart showing an example of a cell changing method according to the present invention.
  • FIG. 2 is a flowchart showing an example of a cell changing method in Embodiment 3.
  • FIG. 2 is a flowchart showing an example of a cell changing method in Embodiment 3.
  • FIG. 3 is a block diagram showing a user equipment UE according to the present invention
  • LTE Long Term Evolution
  • NR New Radio Service
  • PSCell Primary Secondary Cell Group Cell/Primary Secondary Cell
  • the source PSCell is also called the source base station, and can also be the source beam (beam), source transmission point (TRP), source secondary cell group (Secondary Cell Group, SCG), and the target PSCell may also be called the target base station, or are the target beam, the target transmission point, and the target SCG.
  • the PSCell change command described in the present disclosure is an RRC reconfiguration message including a synchronous reconfiguration (Reconfigurationwithsync) information element in the SCG configuration, also referred to as SCG synchronous reconfiguration.
  • SCG synchronous reconfiguration In the LTE system, it refers to an RRC connection reconfiguration message that includes a mobility control information (mobilityControlInfoSCG) information element in the SCG configuration.
  • the synchronization reconfiguration information element or the mobility control information element includes one or more configuration information of the following target cell, such as target cell identification, target cell frequency, public configuration of the target cell such as system information, UE access to The random access configuration used by the target cell, the security parameter configuration of the UE in the target cell, the radio bearer configuration of the UE in the target cell, etc.
  • Cancel, Release, Delete, Empty, and Clear can be replaced. Execution, use and application are interchangeable. Configuration and reconfiguration can be replaced. Links and connections can be replaced. Monitor and detect can be replaced.
  • the UE establishes links with two base stations at the same time, that is, the radio resources used by the UE are provided by different schedulers located in the two base stations.
  • the radio access between the two base stations and the UE can be of the same or different formats (Radio Access Technology, RAT), such as both NR, or one is NR, and the other is LTE, also known as evolved universal terrestrial radio access ( Evolved Universal Terrestrial Radio Access, E-UTRA).
  • RAT Radio Access Technology
  • E-UTRA evolved Universal Terrestrial Radio Access
  • the MCG includes a primary cell (Primary Cell, PCell) and optionally one or more secondary cells (Secondary Cell, SCell).
  • PCell works on the primary frequency, and the UE performs the initial connection establishment procedure or the connection re-establishment procedure through the primary frequency.
  • the SCG contains a PSCell and optionally one or more SCells.
  • the PSCell refers to the SCG cell that the UE performs random access when performing the synchronization reconfiguration procedure or the SCG adding procedure.
  • PCell and PSCell are also collectively referred to as special cells SpCell.
  • the SCG in the dual-connection DC is used as an example, but the SCG is not limited to the dual-connection DC. For example, it may be more than two connections, that is, the UE is connected to more than two base stations. In this case, the operations described in the embodiments are performed for a corresponding SCG.
  • the PSCell change process is triggered by the UE to perform the RRC reconfiguration message containing the synchronization reconfiguration information element for the SCG.
  • the PSCell change process can be initiated by the MN or by the SN.
  • the SN can autonomously initiate the PSCell change process without the participation of the MN.
  • the SN sends the PSCell change command for SCG to the UE on SRB3.
  • the PSCell change initiated by the SN of SRB3 is intra-SN, that is, the PSCell change in the same secondary base station.
  • both the PSCell change process initiated by the SN or the MN sends a PSCell change command to the UE on SRB1, including PSCell change of intra-SN or inter-SN.
  • the RRC reconfiguration message for PSCell change command for SN is contained in the nr-SecondaryCellGroupConfig information element (when E-UTRAN is MN) or the mrdc-SecondaryCellGroup information element (when NR is MN) of its outer RRC message.
  • the outer message is generally an RRC (connection) reconfiguration message or a DLInformationTransferMRDC message.
  • the UE receiving the PSCell change command executes the PSCell change process, starts the timer T304 for monitoring the process, starts downlink synchronization to the target PSCell, and applies the configuration including the RRC reconfiguration message for the synchronization reconfiguration of the SCG , and send an RRC reconfiguration complete message to the network side.
  • the RRC reconfiguration complete message may also be embedded in an outer layer RRC message, such as an RRC (connection) reconfiguration complete message or a ULInformationTransferMRDC message.
  • the UE also triggers the MAC layer to perform a random access procedure to the target PSCell.
  • the UE When the MAC layer successfully completes the triggered random access procedure, the UE performs one or more of the following procedures: (1) stop the T304 timer corresponding to the SCG; (2) stop the radio link corresponding to the source PSCell Timer T310 for failure monitoring; (3) Apply those configurations that do not require the UE to know the system frame number SFN of the target PSCell, including Channel State Information (CSI) report configuration, scheduling request configuration and sounding reference signal configuration, etc.; ( 4) After obtaining the SFN of the target PSCell, apply the measurement and radio resource configuration parts that require the UE to know the SFN of the target PSCell; (5) If the UE is configured for SCG conditional reconfiguration (also called conditional reconfiguration) PSCell Change (Conditional PSCell Change, CPC) configuration, or conditional PSCell Addition Change configuration (Conditional PSCell Addition Change, CPAC) configuration), then remove the saved conditional reconfiguration CUE variable VarConditionalReconfig All entries in the variable), and the source PSCell For
  • the UE sends the UEAssistanceInformation of the UEAssistanceInformation to the source SCG within the last 1 second, and the UE is still configured to provide the relevant UE assistance information in the target SCG, it initiates the UEAssistanceInformation of the cell group.
  • the assistance information RRC message is sent to provide relevant UE assistance information to the target PSCell. (7) End the RRC reconfiguration process.
  • the timing advance of the group or the target cell is always a fixed value such as 0.
  • the network side can configure the UE not to perform the random access process.
  • the rach-skipSCG information element is carried in the RRC message for PSCell change to inform the UE that random access does not need to be performed.
  • the UE configures the lower layer to apply the configuration of the rach-skip. Based on the configuration, the MAC layer applies the time advance TA configuration indicated in the configuration, and starts the timer TAT for the corresponding time.
  • the UE During the process of changing the PSCell, the UE generates an RRC connection reconfiguration complete message and feeds it back to the network side for an RRC message for responding to the PSCell changing command.
  • the MAC layer of the UE monitors the PDCCH for the target PSCell.
  • the Physical Downlink Shared Channel (PDSCH) indicated by the PDCCH) receives the UE contention resolution identification MAC control element, and the MAC layer indicates to the RRC layer that it has successfully received a PDCCH transmission addressed by the C-RNTI.
  • PDSCH Physical Downlink Shared Channel
  • the UE performs the following operations: (1) Stop the T307 timer corresponding to the SCG; (2) ) release the rach-skipSCG configuration; (3) apply those configurations that do not require the UE to know the system frame number SFN of the target PSCell, including Channel State Information (CSI) report configuration, scheduling request configuration and sounding reference signal configuration, etc.; ( 4) After acquiring the SFN of the target PSCell, apply the measurement and radio resource configuration parts that require the UE to know the SFN of the target PSCell.
  • CSI Channel State Information
  • conditional handover condition-based cell change
  • a relatively conservative measurement report threshold is set, so that the base station can obtain the measurement result in advance, and according to the measurement result and the selected target
  • the base station performs the cell change preparation in advance, so that the base station can issue the cell change command including the cell change candidate cell and the cell change execution condition to the UE in advance before the real cell change condition (relative to the conservative measurement report threshold) is satisfied.
  • the UE which carries the conditions for the UE to perform cell change. Different from the existing cell change mechanism, after the UE receives the conditional cell change command, it does not execute the cell change immediately, but saves the received cell change command configuration and executes the cell change according to the cell change execution conditions carried in the cell change command message.
  • conditional cell change refers to a cell change procedure that is performed only when one or more configured cell change execution conditions are satisfied.
  • the cell change execution condition is a measurement event, such as the condition reconfiguration measurement event A3 (the signal quality of the neighbor cell is better than the serving cell by an offset for a continuous period of time).
  • the neighbor cell corresponds to the target cell of the cell change.
  • Condition-based cell change may be applied to PCell change, which may be called conditional handover, or may be applied to PSCell change, which may be called CPC at this time. Because the cell change command is included in the RRC reconfiguration message, the conditional cell change CHO is also called conditional reconfiguration.
  • conditional reconfiguration, conditional reconfiguration for SCG, and CPC/CPAC are interchangeable.
  • the UE energy saving mechanism of cell granularity in the existing mechanism is the UE energy saving mechanism of cell granularity in the existing mechanism:
  • the SCell can be deactivated or the Bandwidth Part (BWP) in which the SCell works can be changed to a dormant BWP to reduce the amount of time that the UE operates on an SCell. Power consumption.
  • BWP Bandwidth Part
  • one or more SCells are activated or deactivated mainly through Medium Access Control (MAC) control element (Control Element, CE) or Radio Resource Control (Radio Resource Control) signaling .
  • MAC Medium Access Control
  • CE Control Element
  • Radio Resource Control Radio Resource Control
  • the UE When the UE receives an SCell activation and deactivates the MAC CE, if the bit corresponding to an SCell in the MAC CE is set to "1" (that is, indicating that the SCell is activated), the UE will activate the SCell; if it is set to "0" (that is, indicating that the SCell is activated) activate the SCell), the UE deactivates the SCell. In addition, if the information element (sCellState) of the SCell in the RRC message received by the UE for indicating the activation and deactivation state of the SCell is set to "activated".
  • sCellState information element
  • the UE activates the SCell; otherwise, if the sCellState of the SCell in the RRC message received by the UE is not set to "activated” or is set to "deactivated”. Then the UE deactivates the SCell.
  • the UE When an SCell is in an active state, the UE performs normal operations on the SCell, including, for example, sending uplink and downlink data normally on the SCell, sending a Sounding Reference Signal (SRS) on the SCell, and a channel for the SCell.
  • SRS Sounding Reference Signal
  • CSI Physical Downlink Control Channel
  • PDCCH Physical Downlink Control Channel
  • PUCCH Physical Uplink Control Channel
  • Configured Grant, CG suspend the uplink permission configured by type 1, clear the HARQ buffer associated with the SCell, and so on.
  • the UE does not perform normal operations on the SCell, including one or more of the following: not sending the sounding reference signal SRS on the SCell, not performing the channel state indication CSI reporting for the SCell, Do not perform physical downlink control channel PDCCH monitoring on the SCell, do not perform PDCCH monitoring for the SCell, do not perform physical uplink control channel PUCCH transmission on the SCell, and do not transmit the uplink shared channel (Uplink Shared Channel, UL- SCH) and Random Access Channel (RACH).
  • the uplink shared channel Uplink Shared Channel, UL- SCH
  • Random Access Channel Random Access Channel
  • the base station configures a dormant BWP identifier of an SCell for the UE through RRC signaling.
  • the activated BWP of an SCell is a dormant BWP
  • the BWP or the SCell can be considered to be in a dormant state.
  • the base station notifies the UE to work on the dormant BWP through RRC signaling or downlink control information (Downlink Control Information, DCI) for BWP change.
  • DCI Downlink Control Information
  • the operations of the UE include one or more of the following: do not monitor the PDCCH on the BWP, do not monitor the PDCCH for the BWP, do not receive the Downlink Shared Channel on the BWP , DL-SCH), do not perform CSI measurement for this BWP, stop all uplink behaviors associated with this SCell, etc.
  • the above-mentioned energy saving mechanism of SCell is not applicable to PSCell, that is to say, SpCell including PCell and PSCell in Release 16 is always activated.
  • the deactivation of the SCG includes suspending the related radio bearer (Radio Bearer, RB), do not monitor the PDCCH channel corresponding to the SCG, etc., thereby improving the power utilization rate.
  • Radio Bearer Radio Bearer
  • the UE can perform PSCell mobility in the SCG deactivated state, including receiving the RRC message of the PSCell change command from SRB1 of the MCG, applying the RRC message, and accessing the target PSCell.
  • the UE may be allowed to perform a PSCell change without performing a random access procedure.
  • the random access process in the PSCell change process is necessary, and the PSCell change process without the random access process will inevitably affect the PSCell change process. If the UE cannot determine the appropriate time to stop the T304 timer, when Apply CSI configuration, etc.
  • the UE when the UE is configured with CPC, for the CPC procedure in the SCG deactivated state, the UE cannot transmit the RRC message for responding to the CPC execution because the SRB3 on the SCG is suspended. Based on this, the content and embodiments described in the present disclosure focus on the issue of how to perform PSCell change under the SCG activation and deactivation mechanism.
  • the UE can correctly transmit the RRC message for responding to the PSCell change command, that is, the RRC reconfiguration complete message, and determine when the PSCell change process ends when the random access process is not performed, so as to complete the PSCell Other UE operations after the change end the RRC reconfiguration process.
  • the activation/deactivation of the SCG, the resume/suspension of the SCG, and the activation/deactivation of the PSCell can be replaced.
  • the SCG activation deactivation command is a general term for the SCG activation command and the SCG deactivation command.
  • FIG. 1 is a flowchart showing an example of a cell changing method according to the present invention.
  • step S101 the user equipment UE performs the PSCell change procedure for the primary and secondary cells of the secondary cell group SCG without triggering the random access procedure.
  • step S102 the UE applies the configuration in the RRC reconfiguration message for the SCG.
  • step S103 the UE sets the content in the RRC reconfiguration complete message as the response message, and delivers the RRC reconfiguration complete message to the lower layer for transmission.
  • step S104 when the RRC reconfiguration complete message is submitted to the lower layer for transmission, or when the UE receives an acknowledgment instruction from the network side, the UE considers that the PSCell change has been successfully completed, and performs UE operations after the PSCell change is completed.
  • This embodiment proposes a method for PSCell synchronization reconfiguration process without performing random access process.
  • the UE can determine the time when the PSCell change process is successfully completed during the PSCell change process without performing the random access procedure, and continue subsequent related UE operations.
  • Step 1 The UE performs a PSCell change procedure for SCG, and during the procedure, the UE does not trigger a random access procedure to the PSCell.
  • the UE does not trigger the random access procedure to the PSCell according to the state of the UE.
  • the SCG of the UE is in a deactivated state.
  • the random access process that the UE does not trigger to the PSCell is configured by the network side.
  • the network side includes an RRC message in the PSCell change command sent to the UE to indicate that there is no random access process. instruction information.
  • the PSCell change process is an RRC reconfiguration process including synchronous reconfiguration performed by a UE for the SCG
  • the RRC message of the PSCell change command refers to the RRC reconfiguration process including the synchronous reconfiguration information element for the SCG. Configuration messages.
  • Step 2 The UE applies the configuration in the RRC reconfiguration message, including the configuration in the synchronization reconfiguration information element.
  • Step 3 The UE sets the content in the response message RRC reconfiguration complete message, and delivers the RRC reconfiguration complete message to the lower layer for transmission.
  • the RRC reconfiguration complete message is sent through SRB1.
  • Step 4 When the RRC reconfiguration complete message is submitted to the lower layer for transmission, the UE considers that the PSCell change is successfully completed, and performs UE operations after the PSCell change is completed. Including one or more of the following: (1) stop the T304 timer corresponding to the SCG; (2) stop the timer T310 corresponding to the source PSCell for radio link failure monitoring; (3) apply those timers that do not require the UE to know the target PSCell The configuration of the system frame number SFN, including the channel state information (Channel State Information, CSI) report configuration, scheduling request configuration and sounding reference signal configuration, etc.; (4) After obtaining the SFN of the target PSCell, apply those that require the UE to know the target The measurement and radio resource configuration part of the SFN of the PSCell; (5) if the UE is configured for the conditional reconfiguration of the SCG (also called the conditional PSCell Change (CPC) configuration, or the conditional PSCell add change configuration (Conditional PSCell Addition Change, C
  • the UE sends the UEAssistanceInformation of the UEAssistanceInformation to the source SCG within the last 1 second, and the UE is still configured to provide the relevant UE assistance information in the target SCG, it initiates the UEAssistanceInformation of the cell group.
  • the assistance information RRC message is sent to provide relevant UE assistance information to the target PSCell. (7) End the RRC reconfiguration process.
  • the UE when the RRC reconfiguration complete message is delivered to the lower layer for transmission and the SCG is in a deactivated state, the UE considers that the PSCell change is successfully completed.
  • the RRC reconfiguration complete message is delivered to the lower layer, which may be that the RRC reconfiguration complete message has been sent or has been successfully sent.
  • the successful transmission is obtained from a bottom layer such as a radio link control layer (Radio Link Control, RLC) or a MAC layer. A confirmation indication of successful transmission is obtained.
  • this embodiment is described based on the change of PSCell, this embodiment is also applicable to a handover process without performing random access, that is, a change process of PCell.
  • the RRC reconfiguration message including synchronous reconfiguration for SCG is an RRC connection reconfiguration message including SCG mobility control information (MobilityControlInfoSCG), and the timer T304 is a timer T307. .
  • step 1 it may further include an RRC message for the UE to receive the PSCell change command from the network side.
  • This embodiment proposes another method for PSCell synchronization reconfiguration procedure without performing random access procedure.
  • the UE can determine the time when the PSCell change process is successfully completed during the PSCell change process without performing the random access procedure, and continue subsequent related UE operations.
  • Step 1 The UE performs a PSCell change procedure for SCG, and during the procedure, the UE does not trigger a random access procedure to the PSCell.
  • the UE does not trigger the random access procedure to the PSCell according to the state of the UE.
  • the SCG of the UE is in a deactivated state.
  • the random access process that the UE does not trigger to the PSCell is configured by the network side.
  • the network side includes an RRC message in the PSCell change command sent to the UE to indicate that there is no random access process. instruction information.
  • the PSCell change process is an RRC reconfiguration process including synchronous reconfiguration performed by a UE for the SCG
  • the RRC message of the PSCell change command refers to the RRC reconfiguration message used for the SCG including the synchronous reconfiguration information element.
  • Step 2 The UE applies the configuration in the RRC reconfiguration message, including the configuration in the synchronization reconfiguration information element.
  • Step 3 The UE sets the content in the response message RRC reconfiguration complete message, and delivers the RRC reconfiguration complete message to the lower layer for transmission.
  • the RRC reconfiguration complete message is sent through SRB1.
  • Step 4 The UE receives the confirmation indication from the network side.
  • the confirmation indication is used to inform the UE that the PSCell change is completed or to inform the UE that the network side has successfully received the RRC reconfiguration complete message in step 3.
  • the indication is an RRC message, alternatively, the indication is a MAC control element or L1 signaling.
  • the UE when the UE receives the confirmation indication and the SCG is in a deactivated state, the UE considers that the PSCell change is successfully completed.
  • the confirmation indication is sent to the UE by the master base station MN.
  • the confirmation indication is generated by the secondary base station SN and sent to the UE through the link of the primary base station MN.
  • this embodiment is described based on the change of PSCell, this embodiment is also applicable to a handover process without performing random access, that is, a change process of PCell.
  • the RRC reconfiguration message including synchronous reconfiguration for SCG is an RRC connection reconfiguration message including SCG mobility control information (MobilityControlInfoSCG), and the timer T304 is a timer T307. .
  • step 1 it may further include an RRC message for the UE to receive a PSCell change command from the network side.
  • This embodiment provides a CPC execution method executed in the SCG deactivated state.
  • the UE executes CPC, and sends the feedback message RRC reconfiguration complete message to the network side on SRB3;
  • the configuration is received through SRB1, then when the CPC execution condition is satisfied, the UE executes CPC, and sends the feedback message RRC reconfiguration complete message to the network side on SRB1.
  • the SCG is in the deactivated state, the SRB associated with the SCG is suspended, and the UE does not monitor the PDCCH associated with the SCG.
  • the CPC configuration is executed and the CPC configuration is received through SRB3.
  • the UE sends the RRC reconfiguration complete message for responding to the completion of the CPC execution to the SN through the SRB1 via the MN, thereby avoiding that the RRC reconfiguration complete message on the UE is cached on the UE side and cannot be sent to the network side The problem.
  • Fig. 2 is a flowchart showing an example of a cell changing method in the third embodiment, and is specifically shown in Fig. 2 .
  • Step 201 The UE performs CPC evaluation, and confirms that all execution conditions corresponding to the stored one or more CPC candidate cells are satisfied.
  • the UE selects one of the one or more trigger cells that satisfy the execution condition as the target PSCell (the selected cell for conditional reconfiguration execution).
  • Step 202 The UE performs CPC configuration on the target PSCell. That is, the UE applies the stored corresponding conditional reconfiguration (condRRCReconfig) to the selected cell, and executes the process of applying the RRC reconfiguration message included in the conditional reconfiguration.
  • the CPC condition reconfiguration of the target PSCell is received through SRB3.
  • Step 203 The UE sets the content of the response message RRC reconfiguration complete message, and generates the message. If the SCG is in a deactivated state at this time, the UE embeds the RRC reconfiguration complete message in an outer layer message and delivers it to the bottom layer through SRB1. send.
  • the outer RRC message is a ULInformationTransferMRDC message.
  • the operation can be described as: if the RRC reconfiguration message is received through SRB3, and if the application of the RRC reconfiguration is performed because the conditional reconfiguration for the SCG is performed and the SCG is in a deactivated state, then the UE The RRC reconfiguration complete message is embedded in an outer layer RRC message and sent to the bottom layer through SRB1.
  • this step is performed under the following conditions: when the RRC reconfiguration message is not received in an outer RRC message (DLInformationTransferMRDC). If the above conditions are not met, the UE submits the RRC reconfiguration complete message to the lower layer for sending through SRB3.
  • the SCG may be in a deactivated state instead of the SRB3 being suspended.
  • This embodiment proposes a method for performing PSCell change in an SCG deactivated state.
  • the UE when the UE performs the PSCell change procedure in the SCG deactivated state, the UE may not trigger the random access procedure.
  • the UE does not trigger the random access process during the PSCell change process, but when the subsequent SCG is activated, the UE triggers the random access process to the SCG/PSCell, and has reached the PSCell. Upstream synchronization.
  • the UE when the UE performs SCG activation, if the UE has performed the PSCell change procedure in the SCG deactivated state before the SCG activation and the random access procedure has not been performed, the UE initiates the random access procedure to the PSCell and obtains the uplink Synchronize.
  • the UE performs SCG activation, either because the UE receives an instruction to activate the SCG from the network side, or because the UE independently determines to activate the SCG. For example, the UE needs to activate the SCG when the uplink data related to the SCG arrives on the UE. transfer data.
  • the indication on the network side for activating the SCG may be RRC signaling, MAC control element or L1 signaling.
  • the arrival of the uplink data associated with the SCG means that the PDCP anchor point of the RB associated with the uplink data is in the SCG.
  • the UE behavior when SCG is activated and deactivated has not yet been determined.
  • the specific behavior of the UE in the SCG activation state and the SCG deactivation state is not limited.
  • the UE when the UE changes an SCG from the deactivated state to the activated state, the UE performs one or more of the following operations:
  • Operation 1 Activate all SCells in the SCG and perform it at the MAC layer or RRC layer;
  • Operation 2 Activate the PSCell corresponding to the SCG, and execute it at the MAC layer or the RRC layer;
  • Operation 3 Activate the downlink BWP and the uplink BWP respectively indicated by the firstActiveDownlinkBWP-Id information element and/or the firstActiveDownlinkBWP-Id information element; wherein the firstActiveDownlinkBWP-Id information element and the firstActiveDownlinkBWP-Id information element are sent by the network side through RRC signaling (such as RRC signaling).
  • RRC signaling such as RRC signaling.
  • Reconfiguration message configuration used to indicate the downlink/uplink BWP identifier activated when the configuration of the RRC signaling is performed or the downlink/uplink BWP identifier used when the MAC layer activates an SCell or PSCell, which is executed at the MAC layer.
  • Operation 4 Start or restart the sCellDeactivationTimer timer associated with the Scell or PSCell; wherein, the sCellDeactivationTimer is used for the activation and deactivation state control of the SCell or PSCell.
  • the UE considers that the associated cell is in the deactivation state, and When it is running, the UE considers the associated cell to be active. Performed at the UE MAC layer.
  • the operation includes starting the restarted SCGdeactivationTimer timer associated with the SCG, wherein the sCellDeactivationTimer is used for the activation and deactivation state control of the SCG, and when it times out, the UE considers that the associated SCG is in The deactivated state, when running, the UE considers the associated SCG to be in an active state.
  • the operation includes stopping the SCG activation and deactivation timer, the SCG activation and deactivation timer is used for the activation and deactivation state control of the SCG, and when it times out, the UE considers that the associated SCG is in the activated state , the UE performs a state change operation including the SCG deactivation state to the activation state described in this embodiment; when it runs, the UE considers that the associated SCG is in the deactivation state.
  • Operation 5 Initialize or reinitialize the pending type 1 configuration uplink grant associated with the SCell or PSCell; performed at the UE MAC layer
  • the above operations 3 to 5 are performed when the firstActiveDownlinkBWP-Id is not set as the dormant BWP.
  • the SCG activation command is MAC CE or RRC signaling
  • in the SCG activation command in addition to indicating that the state of the PSCell/SCG is activated, it also separately indicates that the activation state of each SCG SCell is activated or go activate.
  • the SCell in operation 1 refers to all SCells whose activation states are indicated to be activated, and the above operations 3 to 5 are also performed for all SCells whose activation states are indicated to be activated.
  • Operation 6 Restore all DRBs and SRBs associated with the SCG. This includes the SCG portion of the split bearer. Executed at the RRC layer of the UE
  • Operation 7 Start or restart the uplink time alignment timer timeAlighmentTimer for uplink time alignment associated with the uplink timing advance group (Timing Advance Group, TAG) for the SCG/PSCell or PSCell; execute at the MAC layer of the UE
  • Operation 8 Perform an operation of resetting the MAC entity; preferably, the operation of resetting the MAC entity does not include canceling the triggered buffer status report process (Buffer Status Report, BSR). Performed at the MAC layer of the UE.
  • BSR Buffer Status Report
  • Operation 9 Trigger the random access procedure of the PSCell.
  • the UE determines whether to perform the random access procedure based on the random access indication information in the SCG activation command.
  • the random access indication information in the SCG activation command exists or is set to TRUE or 1
  • the random access parameter in the SCG activation command is configured in the SCG activation command
  • the UE performs the random access procedure of the PSCell.
  • the random access parameter (RACH-ConfigDeadicated information element identifier) refers to the physical random access channel PRACH time-frequency resource, synchronization signal block (Synchronization Signal Block, SSB)/channel status information reference signal (Channel Status) for performing the RACH process.
  • CSIRS Information Reference Signal
  • RSRP Reference Signal Received Power
  • priority parameters such as ra-Prioritization information element
  • Operation 10 If the SCG activation command is obtained through the received MAC CE, or the SCG activation decision is determined by the MAC entity, such as when the BSR is triggered or the random access procedure is triggered, then The MAC entity indicates the SCG activation information to the upper layer (eg, the RRC layer).
  • the upper layer eg, the RRC layer
  • Operation 11 If the SCG activation command is obtained through physical layer signaling DCI, such as the SCG activation field contained in the DCI indicates SCG activation or the BWP identifier contained in the DCI indicates that the BWP is not a dormant BWP, then
  • the physical layer indicates to the upper layer (eg, the MAC layer or the RRC layer) the SCG activation information or the PSCell activation information or the BWP change information.
  • the DCI refers to the DCI used for the PSCell or the SCell of the SCG
  • the BWP refers to the BWP configured by the PSCell or the SCell in this case.
  • Operation 12 If the SCG activation command is obtained through the received RRC signaling, or the SCG activation decision is determined by the RRC, such as when the CPC execution process is triggered, the RRC layer goes down to the lower layer (such as MAC layer) information indicating the activation of the SCG.
  • the SCG activation information may also be expressed as the PSCell activation information.
  • the UE performs the above operation from the SCG deactivation state to the SCG activation state when receiving the SCG activation command, or when the MAC layer or the RRC layer of the UE receives the inter-layer interaction indication information in operations 10 to 12, such as the information indicating SCG activation , perform the above related operations.
  • Operation 13 Start the Radio Link Monitor (RLM) of the SCG link;
  • Operation 14 From the Radio Resource Management (RRM) measurement of the relaxed requirement (relaxed requirement) to the execution of the RRM measurement of the normal SCG.
  • RRM Radio Resource Management
  • Operation 15 Begin to perform beam failure monitoring and possible beam failure recovery on the SCG link.
  • Operation 16 Start sending of an uplink sounding reference signal (Sounding Reference Signal, SRS).
  • SRS Sounding Reference Signal
  • the UE when the UE changes an SCG from the active state to the active state, the UE performs one or more of the following operations:
  • Operation 1 Deactivate all SCells in the SCG, and perform it at the MAC layer or RRC layer;
  • Operation 2 Deactivate the PSCell corresponding to the SCG, and execute it at the MAC layer or the RRC layer;
  • Operation 3 Deactivate the PSCell of the SCG or all BWPs of the SCell, and execute it at the MAC layer;
  • Operation 4 Stop the sCellDeactivationTimer timer associated with the Scell or PSCell or SCG; wherein, the sCellDeactivationTimer is used for the activation and deactivation state control of the SCell or PSCell or SCG.
  • the UE considers that the associated cell or SCG is in the deactivation state active state. Performed at the UE MAC layer.
  • the operation includes starting the SCG activation and deactivation timer, the SCG activation and deactivation timer is used for the activation and deactivation state control of the SCG, when it times out, the UE considers that the associated SCG is in the activated state, The UE performs a state change operation including from the SCG deactivated state to the activated state described in this embodiment; when it is running, the UE considers the associated SCG to be in the deactivated state.
  • Operation 5 Suspend the suspended uplink permission and/or downlink allocation of the type 1 configuration associated with the SCell or PSCell, and clear the response type 2 configuration uplink permission; performed at the UE MAC layer.
  • Operation 6 Suspend all DRBs and SRBs associated with the SCG. These include the SCG portion of the split bearer. Performed at the RRC layer of the UE.
  • Operation 7 Stop the uplink time alignment timer for uplink time alignment associated with the SCG; performed at the MAC layer of the UE.
  • the operation may also be performed as applying the SCG deactivation associated timer value to the uplink time alignment timer timeAlignmentTimer.
  • the value of the timer refers to the value used to configure the timer duration (configured with the timeAlignmentTimer information element in the TAG-Config information element); the timer refers to the PSCell of the SCG or the timer corresponding to the TAG associated with the SCell.
  • the timer value associated with the SCG deactivation means that the configuration of the timer duration value in the SCG deactivation state is different from the timer duration value used in the SCG activation state.
  • Operation 8 Perform an operation of resetting the MAC entity; performed at the MAC layer of the UE.
  • Operation 9 If the SCG deactivation command is obtained through the received MAC CE, or the SCG deactivation decision is determined by the MAC entity, such as when the deactivation timer associated with the PSCell times out or When the timer associated with the SCG deactivation expires, the MAC entity indicates the information of the SCG deactivation to the upper layer (eg, the RRC layer).
  • the upper layer eg, the RRC layer
  • the SCG deactivation command is obtained through physical layer signaling DCI, such as the SCG deactivation field included in the DCI indicates SCG deactivation or the BWP identifier included in the DCI indicates that the BWP is dormant BWP
  • the physical layer indicates to the upper layer (such as the MAC layer or the RRC layer) the information about the deactivation of the SCG or the information about the deactivation of the PSCell or the information about the change of the BWP.
  • the DCI refers to the DCI used for the PSCell or the SCell of the SCG
  • the BWP refers to the BWP configured by the PSCell or the SCell in this case. .
  • Operation 11 If the SCG deactivation command is obtained through the received RRC signaling, or the SCG deactivation decision is determined by the RRC, such as when the CPC execution process is triggered, the RRC layer goes down to the lower layer Information (eg MAC layer) indicating the deactivation of the SCG.
  • the SCG deactivation information may also be expressed as the PSCell deactivation information.
  • Operation 12 If a DRB or SRB is configured as a split bearer, if its primary path information element primaryPath is set to SCG, set the primary path or primarypath information element to MCG. Preferably, this operation is performed when the RB is not configured with PDCP duplication (indicated by the pdcp-Duplication information element).
  • the primarypath information element is used to indicate the logical channel identifier and cell group identifier of the primary RLF entity used for uplink transmission when more than one RLC entity is associated with a PDCP entity of a bearer.
  • Operation 13 Change the PSCell of the SCG and/or the currently activated working BWP of the SCell to a dormant BWP.
  • the UE When the UE receives the SCG deactivation command or when the UE determines that the SCG is deactivated (for example, the corresponding deactivation timer expires), the above operation from the SCG activation state to the SCG deactivation state is performed, or the MAC layer of the UE or the RRC When receiving the inter-layer interaction indication information in operations 9 to 11, such as the information indicating the deactivation of the SCG, the layer performs the above-mentioned related operations.
  • the SCG activation/deactivation command may be contained in RRC signaling, MAC CE or physical layer L1 signaling DCI.
  • the SCG deactivation command may indicate the state of the PSCell or each SCell, such as indicating that the cell is in a deactivated state, or instructing the cell to change the activated working BWP to a dormant BWP.
  • Operation 14 Stop the Radio Link Monitor (RLM) of the SCG link;
  • Operation 15 From the normal RRM measurement of the SCG to the Radio Resource Management (Radio Resource Management, RRM) measurement of the relaxed requirement.
  • RRM Radio Resource Management
  • Operation 16 Stop performing beam failure monitoring and possible beam failure recovery on the SCG link.
  • Operation 17 Stop sending the uplink sounding reference signal (Sounding Reference Signal, SRS).
  • Sounding Reference Signal, SRS Sounding Reference Signal
  • UE operations in the SCG deactivation state include one or more of the following:
  • the DRB or SRB associated with the SCG is in a pending state
  • the PSCell and SCell of the SCG work on the dormant BWP corresponding to the cell.
  • RLM is not monitored on the radio link of the SCG link
  • the RRM measurement of the relaxed demand is performed.
  • Beam failure monitoring and possible beam failure recovery is not performed on SCG links.
  • SRS Sounding Reference Signal
  • the UE in the SCG activation state performs normal communication operations of the PSCell and the SCell of the SCG, including one or more of the following:
  • the DRB or SRB associated with the SCG is in a non-suspended state
  • the PSCell and SCell of the SCG do not work on the dormant BWP corresponding to the cell.
  • the SCG when the SCG is in the active state, only the PSCell is in the active state or the PSCell does not work on the dormant BWP, and one or more SCells are allowed to be in the deactivated state or work on the dormant BWP.
  • one or more of the above operations Item is for PSCell and SCell in active state or SCell working on non-dormant BWP.
  • SRS Sounding Reference Signal
  • FIG. 3 is a block diagram showing a user equipment UE according to the present invention.
  • the user equipment UE30 includes a processor 301 and a memory 302 .
  • the processor 301 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like.
  • the memory 302 may include, for example, volatile memory (eg, random access memory RAM), a hard disk drive (HDD), non-volatile memory (eg, flash memory), or other memory, or the like.
  • the memory 302 has program instructions stored thereon. When the instruction is executed by the processor 301, various methods such as the above-mentioned mobile information reporting method described in detail in the present invention can be executed.
  • base station refers to a mobile communication data and control switching center with larger transmit power and wider coverage area, including functions such as resource allocation and scheduling, data reception and transmission, and the like.
  • User equipment refers to a user's mobile terminal, for example, including a mobile phone, a notebook, and other terminal equipment that can wirelessly communicate with a base station or a micro base station.
  • the method and related apparatus of the present disclosure have been described above in conjunction with the preferred embodiments. Those skilled in the art will understand that the methods shown above are only exemplary. The methods of the present disclosure are not limited to the steps and sequences shown above.
  • the base station and user equipment shown above may include more modules, for example, may also include modules that can be developed or developed in the future and that can be used for the base station, MME, or UE, and so on.
  • the various identifiers shown above are only exemplary and not restrictive, and the present disclosure is not limited to the specific information elements exemplified by these identifiers. Numerous changes and modifications may occur to those skilled in the art in light of the teachings of the illustrated embodiments.
  • the program running on the device may be a program that causes a computer to implement the functions of the embodiments of the present disclosure by controlling a central processing unit (CPU).
  • the program or information processed by the program may be temporarily stored in volatile memory (such as random access memory RAM), a hard disk drive (HDD), nonvolatile memory (such as flash memory), or other memory systems.
  • a program for realizing the functions of the embodiments of the present disclosure can be recorded on a computer-readable recording medium.
  • the corresponding functions can be realized by causing a computer system to read programs recorded on the recording medium and execute the programs.
  • the so-called "computer system” as used herein may be a computer system embedded in the device, and may include an operating system or hardware (eg, peripheral devices).
  • the "computer-readable recording medium” may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium that dynamically stores a program for a short period of time, or any other recording medium readable by a computer.
  • circuits eg, monolithic or multi-chip integrated circuits.
  • Circuits designed to perform the functions described in this specification may include general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above.
  • DSPs digital signal processors
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • a general-purpose processor may be a microprocessor or any existing processor, controller, microcontroller, or state machine.
  • the above circuit may be a digital circuit or an analog circuit. In the event that new integrated circuit technologies emerge as a result of advances in semiconductor technology to replace existing integrated circuits, one or more embodiments of the present disclosure may also be implemented using these new integrated circuit technologies.

Abstract

L'invention concerne un procédé de changement de cellule et un équipement utilisateur (UE). Le procédé de changement de cellule comprend les étapes suivantes : un UE exécute un processus de changement de cellule secondaire primaire (PSCell) pour un groupe de cellules secondaires (SCG) sans déclencher un processus d'accès aléatoire ; l'UE utilise une configuration dans un message de reconfiguration RRC pour le SCG ; l'UE configure le contenu dans un message de fin de reconfiguration RRC en tant que message de réponse, puis transmet le message de fin de reconfiguration RRC à une couche inférieure pour l'envoi ; et lorsque le message de fin de reconfiguration RRC est transmis à la couche inférieure pour l'envoi, ou que l'UE reçoit une indication d'accusé de réception d'un côté réseau, l'UE considère que le changement de la PSCell a été effectué avec succès, puis exécute une opération d'UE une fois que le changement de la cellule PSCell est terminée.
PCT/CN2021/137408 2020-12-16 2021-12-13 Procédé de changement de cellule et équipement utilisateur WO2022127731A1 (fr)

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