WO2022127730A1 - 由用户设备执行的方法以及用户设备 - Google Patents

由用户设备执行的方法以及用户设备 Download PDF

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Publication number
WO2022127730A1
WO2022127730A1 PCT/CN2021/137403 CN2021137403W WO2022127730A1 WO 2022127730 A1 WO2022127730 A1 WO 2022127730A1 CN 2021137403 W CN2021137403 W CN 2021137403W WO 2022127730 A1 WO2022127730 A1 WO 2022127730A1
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scg
failure
user equipment
scell
pscell
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PCT/CN2021/137403
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English (en)
French (fr)
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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 WO2022127730A1 publication Critical patent/WO2022127730A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • the present disclosure relates to the technical field of wireless communication, and more particularly, to a recovery method after a wireless link failure and a corresponding user equipment.
  • the UE When the UE is configured with DC, if the radio link failure of the primary cell group link is detected and the secondary cell group is active at this time state, the UE can report the failure to the primary base station through the secondary cell group link, and wait for a response from the network side to restore the failed link as soon as possible.
  • the present disclosure proposes a solution to the problem of how to perform link recovery 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 link recovery when the SCG activation/deactivation mechanism is introduced in the NR system.
  • the embodiments of the present disclosure provide a link recovery method in a user equipment and a corresponding user equipment.
  • a method performed in a user equipment UE comprising: detecting that an MCG failure occurs; if T316 is configured, and if SCG transmission is not suspended or if SCG transmission is suspended If the SCG is deactivated, the MCG failure information procedure is initiated; otherwise, the RRC connection re-establishment procedure is initiated.
  • the SCG is activated.
  • the process of initiating the MCG failure information is performed when there is no ongoing PSCell change process.
  • the MCG failure refers to a radio link failure.
  • the fact that the SCG transmission is suspended because the SCG is deactivated means that the SCG transmission is not suspended due to an SCG failure.
  • the SCG failure refers to the occurrence of an SCG failure information process.
  • the SCG failure information process is due to monitoring the RLF of the SCG, the occurrence of a synchronization reconfiguration failure of the SCG, the failure of the SCG configuration, or the reception from the SCG bottom layer about signaling Initiated when the integrity check failure of the radio bearer SRB3 indicates one or more of them.
  • the activating the SCG includes at least restoring the SRB of the SCG.
  • a user equipment includes: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, perform the method of the above-mentioned first aspect.
  • FIG. 1 is a flowchart of the basic process of the method executed by the user equipment in the first embodiment of the invention.
  • FIG. 2 is a block diagram illustrating a user equipment according to an embodiment of the present invention.
  • PSCell change means that the PSCell of the UE is changed from the source PSCell to the target PSCell, where the source PSCell and the target PSCell can be the same cell or different cells .
  • 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.
  • RRC connection reconfiguration message including a mobility control information (mobilityControlInfo) information element in the SCG configuration.
  • 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 takes the SCG under the dual-connection DC as an example, but it is not limited to the SCG under the dual-connection DC. In this case, the operations described in the embodiments are performed for a corresponding SCG.
  • the UE will initiate the RRC connection re-establishment process after the radio link failure (Radio Link Failure, RLF) of the primary cell group occurs or the UE fails to perform the handover process (HandOver Failure, HOF) (ie, T304 times out). to rebuild/restore the connection to the network side.
  • RLF Radio Link Failure
  • HOF Handover Failure
  • the UE first performs a cell selection process to select a re-established cell, and sends an RRC connection re-establishment request message to it.
  • the UE When the UE receives the response message as the RRC connection re-establishment message, the UE re-establishes the RRC connection according to the configuration in the RRC connection re-establishment message, and feeds back the RRC connection re-establishment complete message to the base station to successfully end the RRC connection re-establishment process.
  • the re-established cell refers to a cell used by the UE to send an RRC connection re-establishment request message and receive a corresponding response message for re-establishing an RRC connection in an RRC connected state.
  • a timer T311 is defined in the RRC re-establishment process.
  • T311 is started when the UE initiates the RRC connection re-establishment procedure.
  • stop T311 if T311 times out, the UE cannot select a suitable cell.
  • the RRC connected state enters the RRC idle state or the RRC inactive state (RRC_Inactive).
  • the Dual Linking and Carrier Aggregation Enhancement Project for Release 16 (see document RP-190452) introduced a fast MCG link recovery mechanism.
  • the so-called “fast” is relative to the existing link restoration mechanism (ie, the link connection is restored through the RRC connection re-establishment process).
  • the fast MCG link recovery mechanism when RLF occurs in the MCG of the UE, if the link quality of the UE's Secondary Cell Group (SCG) is good (that is, no RLF occurs, the timer T310 is not running or not In the PSCell change process (that is, the T04 corresponding to the SCG is not running), or the SCG is not in a suspended state (not suspended), at this time, neither the MCG nor the SCG is in the suspended (or interrupted) state or the timer T316 is not running.
  • SCG Secondary Cell Group
  • the UE initiates the MCG failure information process, and connects the MCG link through the SCG link (such as split Signalling Radio Bearer (split SRB) or the third signaling radio bearer (Signalling Radio Bearer 3, SRB3))
  • the failure information is reported to the primary base station instead of directly triggering the RRC connection re-establishment process.
  • the UE will suspend the transmission on the MCG side corresponding to all SRBs and DRBs except SRB0, and reset the MAC entity corresponding to the MCG.
  • the master base station that receives the MCG link failure information report can send an RRC connection reconfiguration message containing the synchronization reconfiguration information element to the UE to trigger the UE to switch to a new cell or send an RRC release message to release the UE's RRC connection.
  • This fast MCG link recovery mechanism/process can be applied to the case where MR-DC (Multi-Radio access technology Dual Connectivity) is configured, such as NE-DC (NR E-UTRA Dual Connectivity), EN-DC (E- UTRA NR Dual Connectivity), NR DC (New Radio Dual Connectivity), NGEN-DC (Next Generation-radio access network E-UTRA NR Dual Connectivity), LTE DC (intra-E-UTRAN DC), etc.
  • MR-DC Multi-Radio access technology Dual Connectivity
  • NE-DC NR E-UTRA Dual Connectivity
  • EN-DC E- UTRA NR Dual Connectivity
  • NR DC New Radio Dual Connectivity
  • NGEN-DC Next Generation-radio access network E-UTRA NR Dual Connectivity
  • 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:
  • 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 performs normal operations on the SCell, including, for example: sending uplink and downlink data normally on the SCell, sending a sounding reference signal (Sounding Reference Signal, SRS) on the SCell, and a channel for the SCell Status indication (Channel State Information, CSI) reporting, performing physical downlink control channel (Physical Downlink Control Channel, PDCCH) monitoring on the SCell, performing PDCCH monitoring for the SCell and the physical uplink control channel (Physical Uplink Control Channel) on the SCell Control Channel, PUCCH) transmission, etc.
  • SRS Sounding Reference Signal
  • CSI Channel State Information
  • the UE stops the timer associated with the SCell, deactivates the activated BWP associated with the SCell, and clears the configured downlink assignment (downlink assignment) associated with the SCell or the uplink grant (type 2 configuration) associated with the SCell.
  • 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 send an uplink shared channel (Uplink Shared Channel, UL- SCH) and Random Access Channel (RACH).
  • an 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 UE when the MCG fails in the state of SCG deactivation, the UE can still use the SCG link to notify the network side of the link failure information, so that the network side can repair the link by means such as handover, etc. It avoids the larger link interruption caused by the UE through the link repair mechanism of the traditional RRC connection re-establishment process, and also avoids the DC configuration delay caused by the DC release during the unnecessary RRC re-establishment 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.
  • This embodiment provides a link recovery method when the UE is configured with fast MCG recovery and SCG deactivation at the same time.
  • Step 1 The UE detects that an MCG failure has occurred.
  • the MCG failure refers to a radio link failure (Radio Link Failure, RLF).
  • RLF Radio Link Failure
  • the RLF of the MCG is usually considered to have monitored the MCG RLF when one or more of the following conditions are met: when the T310 timer in the PCell times out, when the T312 timer in the PCell times out, when the media from the MCG is received.
  • the random access problem indication from the Medium Access Control (MAC) layer and the T300, T301, T304, T311 and T319 timers are not running at this time, or when the radio link control (Radio Link Control,
  • the indication information of the RLC) layer indicates that the maximum number of retransmissions has been reached.
  • Step 2 If T316 is configured, and if SCG transmission is not suspended or if SCG transmission is suspended due to SCG deactivation, and if there is no ongoing PSCell change process (i.e. T304 timing for SCG) If the timer or T307 timer is not running), the MCG failure information process is initiated; otherwise, the RRC connection re-establishment process is initiated.
  • T304 timing for SCG If the timer or T307 timer is not running), the MCG failure information process is initiated; otherwise, the RRC connection re-establishment process is initiated.
  • the SCG failure refers to the occurrence of the SCG failure information process.
  • the SCG failure information process is initiated due to monitoring the RLF of the SCG; alternatively, it is due to the occurrence of SCG synchronization reconfiguration failure, SCG configuration failure, or an integrity check on SRB3 received from the SCG bottom layer Failure indication.
  • Step 3 During the MCG failure information process, such as when initializing the MCG failure information process, activate the SCG.
  • the activating SCG includes resuming SCG transmission.
  • the UE initiates the sending of the MCG failure information RRC message on the SCG side of SRB3 or split SRB1, so as to inform the network side that the MCG fails.
  • the activation of the SCG includes at least restoring the SRBs of the SCG, such as SRB1 and/or SRB3.
  • step 4 the UE receives the response RRC message from the network side, and executes the RRC message.
  • the response message may be an RRC connection reconfiguration message (carrying a reconfigurationwithsync information element for MCG) used to instruct the handover, or an RRC connection release message used to instruct the UE to release/suspend the RRC connection.
  • step 4 may also be that T316 times out, the UE does not receive a response RRC message from the network side, and initiates an RRC connection re-establishment process.
  • the MCG failure information process is also referred to as a fast MCG link recovery process.
  • the UE usually initiates the MCG failure information procedure when the following conditions are met: the UE is configured with the parameters of fast MCG link recovery, that is, the timer T316, the UE is configured with split SRB or SRB3, and neither MCG nor SCG is being used. Suspended (not suspended) state, the timer T316 is not running.
  • the timer T316 is used to monitor the MCG failure information process.
  • the UE starts T316 when sending the MCGfailureinformation message. Stop T316 when MCG transmission is resumed, or when a response RRCrelease message is received from the network side, or when an RRC re-establishment process is initiated.
  • T316 times out the UE considers that the fast MCG link recovery process has failed to end, and thus triggers the RRC re-establishment process to try to recover the connection with the network side.
  • certain restrictions are imposed on the configuration on the network side.
  • the limitation is that the network side will not simultaneously deactivate the SCG when the fast MCG recovery mechanism is enabled/configured for the UE.
  • T316 is configured when the fast MCG recovery mechanism is enabled/configured.
  • the UE Preferably, if the UE receives a command for deactivating the SCG from the network side when the fast MCG recovery is configured, the UE ignores the SCG deactivation command. Alternatively, if the UE receives an RRC message for configuring fast MCG recovery in the SCG deactivated state, the UE ignores the configuration or considers that the RRC reconfiguration fails. If the same RRC message received by the UE contains both the enabling configuration of fast MCG recovery and the deactivation indication of SCG, the UE considers that the RRC reconfiguration fails.
  • 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 a deactivated 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, for example, 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. This includes 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
  • Operation 10 If 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 SCG deactivation information or the PSCell deactivation 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. .
  • 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
  • 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 (eg, random access memory RAM), a hard disk drive (HDD), non-volatile memory (eg, 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” here 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.

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Abstract

本发明提供了一种由用户设备执行的方法以及用户设备，所述方法包括：检测到发生了MCG失败；若T316被配置，且若SCG传输不被挂起或若SCG传输被挂起是由于SCG被去激活，则发起MCG失败信息过程；否则发起RRC连接重建立过程。

Description

由用户设备执行的方法以及用户设备 技术领域
本公开涉及无线通信技术领域，更具体地，本公开涉及无线链路失败后的恢复方法以及对应的用户设备。
背景技术
3GPP RAN工作组目前在进行一个版本17的研究项目(参见3GPP文档RP-193249(New WID on further enhancements on Multi-Radio Dual-Connectivity))。其中，为了进一步降低UE在双连接DC情况的功率消耗，研究目的之一是实现动态的辅小区组(Secondary Cell Group，SCG)激活/去激活机制。在SCG去激活的状态下，UE可以不必执行对SCG中所关联服务小区的下行物理信道监听，也无需执行相关的链路状态检测或链路状态报告，从而到达省电的目的。在版本16的NR系统中，有一种可称为快速主小区组恢复的机制，当UE被配置了DC时，若检测到了主小区组链路的无线链路失败且此时辅小区组处于活动状态，则UE可以通过辅小区组链路向主基站报告所发生的失败，并等待来自网络侧的响应以尽快恢复失败的链路。
本公开针对在NR系统中在引入SCG激活/去激活机制下如何执行链路恢复的问题提出解决方法。
发明内容
本公开实施例的目的在于针对在NR系统中在引入SCG激活/去激活机制下如何执行链路恢复的问题提出解决方法。本公开实施例提供了在用户设备中链路恢复方法及对应的用户设备。
根据本公开的第一方面，提出了一种在用户设备UE中执行的方 法，包括：检测到发生了MCG失败；若T316被配置，且若SCG传输不被挂起或若SCG传输被挂起是由于SCG被去激活，则发起MCG失败信息过程；否则发起RRC连接重建立过程。
根据本发明的第一方面的由用户设备执行的方法，在所述MCG失败信息过程中，激活SCG。
根据本发明的第一方面的由用户设备执行的方法，发起所述MCG失败信息过程是在没有正在进行的PSCell变更过程时执行。
根据本发明的第一方面的由用户设备执行的方法，所述MCG失败指的是无线链路失败。
根据本发明的第一方面的由用户设备执行的方法，所述SCG传输被挂起是由于SCG被去激活是指所述SCG传输不是由于SCG失败而被挂起。
根据本发明的第一方面的由用户设备执行的方法，所述SCG失败指的是发生了SCG失败信息过程。
根据本发明的第一方面的由用户设备执行的方法，所述SCG失败信息过程是由于监测到了SCG的RLF、发生了SCG的同步重配置失败、SCG配置失败或从SCG底层收到了关于信令无线承载SRB3的完整性检查失败指示其中的一项或多项而发起的。
根据本发明的第一方面的由用户设备执行的方法，所述激活SCG至少包括恢复SCG的SRB。
根据本发明的第二方面的用户设备，包括：处理器；以及存储器，存储有指令；其中，所述指令在由所述处理器运行时执行上述第一方面的所述方法。
附图说明
为了更完整地理解本公开及其优势，现在将参考结合附图的以下描述，其中：
图1发明的实施例一中由用户设备执行的方法的基本过程的流程图。
图2是示出了根据本发明的实施例的用户设备的框图。
在附图中，相同或相似的结构均以相同或相似的附图标记进行标识。
具体实施方式
根据结合附图对本公开示例性实施例的以下详细描述，本公开的其它方面、优势和突出特征对于本领域技术人员将变得显而易见。
在本公开中，术语“包括”和“含有”及其派生词意为包括而非限制；术语“或”是包含性的，意为和/或。
在本说明书中，下述用于描述本公开原理的各种实施例只是说明，不应该以任何方式解释为限制公开的范围。参照附图的下述描述用于帮助全面理解由权利要求及其等同物限定的本公开的示例性实施例。下述描述包括多种具体细节来帮助理解，但这些细节应认为仅仅是示例性的。因此，本领域普通技术人员应认识到，在不背离本公开的范围和精神的情况下，可以对本文中描述的实施例进行多种改变和修改。此外，为了清楚和简洁起见，省略了公知功能和结构的描述。此外，贯穿附图，相同参考数字用于相似功能和操作。如未做特殊说明，实施例之前的术语、定义以及方法可以共用，实施例之前可协同工作。
下文以长期演进系统(Long Term Evolution，LTE)/NR移动通信系统及其后续的演进版本作为示例应用环境，具体描述了根据本公开的多个实施方式。然而，需要指出的是，本公开不限于以下实施方式，而是可适用于更多其它的无线通信系统。若无特殊说明，在本公开中，小区和基站的概念可以互相替换；PSCell变更指UE的PSCell从源PSCell变更为目标PSCell，其中源PSCell和目标PSCell可以是同一个小区也可以是不同的小区。源PSCell也称为源基站，也可以是源光束(beam)、源传输点(Transmission point，TRP)、源辅小区组(Secondary Cell Group，SCG)，目标PSCell也可称为目标基站，也可以是目标光束、目标传输点、目标SCG。本公开所述PSCell变更命令在NR系统中是SCG配置中包含同步重配置(Reconfigurationwithsync)信息元素的RRC重配置消息，也称为SCG的同步重配置。在LTE系统中是SCG 配置中包含移动控制信息(mobilityControlInfo)信息元素的RRC连接重配置消息。其中，所述同步重配置信息元素或移动控制信息信息元素包含下述目标小区的一个或多个配置信息，例如目标小区标识、目标小区频率、目标小区的公共配置如系统信息、UE接入到目标小区所使用的随机接入配置、UE在目标小区的安全参数配置、UE在目标小区的无线承载配置等。取消、释放、删除、清空和清除等可以替换。执行、使用和应用可替换。配置和重配置可以替换。链路和连接可以替换。监测(monitor)和检测(detect)可替换。如未特殊说明，本公开实施例也可适用于LTE系统。
下述先简要描述本公开实施例所涉及到的在先技术。
双连接(Dual Connectivity，DC)：
为了提高UE的数据传输效率，UE同时与两个基站建立链路，也就是UE所使用的无线资源由位于两个基站的不同调度器的提供。这两个基站与UE之间的无线接入可以是相同或不同的制式(Radio Access Technology，RAT)，如都是NR，或一个是NR，一个是LTE也称演进的通用陆地无线接入(Evolved Universal Terrestrial Radio Access，E-UTRA)。在这两个基站中，一个称为主基站(Master Node，MN)或MgNB、MeNB，主基站下的服务小区组称为主小区组(Master Cell Group，MCG)；另一个称为辅基站(Secondary Node，SN)或SgNB、SeNB，辅基站下的服务小区组称为辅小区组(Secondary Cell Group，SCG)。MCG包含一个主小区(Primary Cell，PCell)和可选的一个或多个辅小区(Secondary Cell，SCell)。PCell工作在主频率上，UE通过主频率执行初始连接建立过程或连接重建立过程。SCG包含一个PSCell和可选的一个或多个SCell。PSCell是指UE在执行同步重配置过程或SCG添加过程时执行随机接入的SCG小区。PCell和PSCell也统称为特殊小区SpCell。本公开中，所述SCG以双连接DC下的SCG为例，但并不限定仅在双连接DC情况下的SCG，比如可以是多于两个连接即UE与多于两个基站连接的情况的多个SCG，此时，实施例中所述操作是对于对应的某个SCG执行的。
现有机制中的链路恢复机制：
再次，介绍一下现有机制中即版本15及之前的链路恢复机制。在现有机制中，UE在发生主小区组的无线链路失败(Radio Link Failure，RLF)或者UE执行切换过程失败(HandOver Failure，HOF)(即T304超时)后，会发起RRC连接重建立过程来重建/恢复与网络侧的连接。在发起的RRC连接重建立过程中，UE先执行小区选择过程来选择一个重建小区，并向其发送RRC连接重建立请求消息。当UE收到响应消息为RRC连接重建消息时，UE根据RRC连接重建消息中的配置来重建立RRC连接，并向基站反馈RRC连接重建完成消息，成功结束所述RRC连接重建立过程。重建小区指的是UE用于发送RRC连接重建立请求消息并接收对应的响应消息的用于在RRC连接态下重建立RRC连接的小区。在RRC重建立过程中定义了一个定时器T311。当UE发起RRC连接重建立过程时启动T311。当在小区选择过程中选择到了一个用于重建的合适小区时，停止T311；若T311超时，UE也无法选择到一个合适小区，此时一般认为UE处于不在覆盖区(out ofcoverage)，UE会离开RRC连接态，进入到RRC空闲态或RRC不活动态(RRC_Inactive)。
快速MCG链路恢复机制：
版本16的双链接和载波聚合增强项目(参见文献RP-190452中)引入了一种快速MCG链路恢复机制。所谓“快速”是相对于现有链路恢复机制(即通过RRC连接重建立过程来恢复链路连接)而言的。在快速MCG链路恢复机制中，当UE的MCG发生RLF时，若UE的辅小区组(Secondary Cell Group，SCG)链路质量是好的(即未发生RLF、定时器T310未在运行或不处于PSCell变更过程(即SCG对应的T04不在运行)，或SCG不是被挂起状态(not suspended))，此时，MCG和SCG都不在被挂起(或称中断)状态或者定时器T316不在运行状态，则UE发起MCG失败信息流程，通过SCG链路(如分裂信令无线承载(split Signalling Radio Bearer，split SRB)或第三信令无线承载(Signalling Radio Bearer 3，SRB3))将MCG链路失败 的信息报告给主基站，而不是直接触发RRC连接重建立过程。在MCG失败信息流程中，UE会挂起除SRB0之外所有SRB和DRB对应的MCG侧的传输，并重置MCG对应的MAC实体。收到MCG链路失败信息报告的主基站可以向UE发送包含同步重配置信息元素的RRC连接重配置消息来触发UE切换到一个新的小区或者发送RRC释放消息来释放UE的RRC连接。这种快速MCG链路恢复机制/过程可以应用于被配置了MR-DC(Multi-Radio access technology Dual Connectivity)的情况，比如NE-DC(NR E-UTRA Dual Connectivity)、EN-DC(E-UTRA NR Dual Connectivity)、NR DC(New Radio Dual Connectivity)、NGEN-DC(Next Generation-radio access network E-UTRA NR Dual Connectivity)、LTE DC(intra-E-UTRAN DC)等。本公开中，MCG失败信息过程和快速MCG链路恢复过程是等同的。
现有机制中的小区粒度的UE节能机制：
在版本16的NR系统中，考虑到UE的业务量变化，可以通过去激活SCell或将SCell所工作的带宽部分(Bandwidth Part，BWP)变更为休眠BWP的的方法，来降低UE在一个SCell上的功率消耗。
在SCell激活去激活机制中，主要通过媒介接入控制(Medium Access Control，MAC)控制元素(Control Element，CE)或无线资源控制(Radio Resource Control)信令来激活或去激活一个或多个SCell。此外，当UE上运行的SCell所关联的SCell去激活定时器超时或停止时，UE去激活所对应的SCell。当UE收到一个SCell激活去激活MAC CE，若MAC CE中一个SCell所对应的bit设置为“1”(即指示激活该SCell)，则UE激活该SCell；若设置为“0”(即指示激活该SCell)，则UE去激活该SCell。此外，若UE所接收到的RRC消息中所述SCell的用于指示SCell激活去激活状态的信息元素(sCellState)被设置为“activated”。则UE激活该SCell；否则若UE所接收到的RRC消息中所述SCell的sCellState不设置为“activated”或设置为“deactivated”。则UE去激活该SCell。当一个SCell处于激活状态时，UE对该SCell执行正常操作，包括如：在该SCell正常发送上下行数据、在该SCell 上发送探测参考信号(Sounding Reference Signal，SRS)、用于该SCell的信道状态指示(Channel State Information，CSI)上报、在该SCell上执行物理下行控制信道(Physical Downlink Control Channel，PDCCH)监听、执行用于该SCell的PDCCH监听和该SCell上的物理上行控制信道(Physical Uplink Control Channel，PUCCH)发送等。当一个SCell被去激活时，UE停止该SCell所关联的定时器、去激活该SCell所关联的激活BWP、清除该SCell所关联的配置的下行分配(downlink asignment)或类型2配置的上行许可(Configured Grant，CG)、挂起类型1配置的上行许可、清空该SCell所关联的混合自动重传HARQ缓存等。对于一个处于去激活状态的SCell，UE对该SCell不执行正常操作，包括下述一项或多项：不在该SCell上发送探测参考信号SRS、不执行用于该SCell的信道状态指示CSI上报、不在该SCell上执行物理下行控制信道PDCCH监听、不执行用于该SCell的PDCCH监听、不执行该SCell上的物理上行控制信道PUCCH发送、不在该SCell上发送上行共享信道(Uplink Shared Channel，UL-SCH)和随机接入信道(Random Access Channel，RACH)。
在SCell休眠机制中，通过将激活状态下的SCell工作在一个被配置的休眠BWP上来实现进一步的节能。基站通过RRC信令对UE配置一个SCell的休眠BWP标识。当一个SCell的激活BWP是休眠BWP时，可以认为该BWP或该SCell处于休眠状态。基站通过RRC信令或用于BWP变更的下行控制信息(Downlink Control Information，DCI)来通知UE工作到休眠BWP上。对于一个休眠的BWP，UE的操作包括下述一项或多项：不监听在该BWP上的PDCCH、不监听用于该BWP的PDCCH、不接收在该BWP上的下行共享信道(Downlink Shared Channel，DL-SCH)、不执行用于该BWP的CSI测量、停止所有的与该SCell关联的上行行为等。
但上述SCell的节能机制并不适用于PSCell，也就是说版本16中包含PCell和PSCell在内的SpCell总是处于激活状态。如前所述，在目前的版本17中期望在UE业务量低时进一步节省不必要的上下行发 送或链路监测所带来的功率开销。一种方式是引入SCG的激活去激活机制，通过将整个SCG小区组快速激活和去激活以适应动态变化的UE业务量/业务速率，从而提高功率利用率。本公开中所述内容及实施例关注在SCG激活去激活机制下如何处理MCG链路失败的问题。通过本公开所述方法，UE可以在SCG去激活的状态下发生MCG失败时，依然借助SCG链路来告知网络侧所述链路失败信息，从而使得网络侧能够通过切换等手段修复链路，避免UE通过传统RRC连接重建立过程的链路修复机制而带来的更大的链路中断，也避免了不必要的RRC重建立过程中的DC释放而带来的DC配置时延。所述SCG的激活/去激活、SCG的恢复(resume)/挂起(suspension)，和PSCell的激活/去激活之间可以替换。SCG激活去激活命令是对SCG激活命令和SCG去激活命令的统称。
实施例1
该实施例提供了一种UE同时配置了快速MCG恢复和SCG去激活的情况下的链路恢复方法。
步骤1：UE检测到发生了MCG失败。优选地，所述MCG失败指的是无线链路失败(Radio Link Failure，RLF)。所述MCG的RLF通常是在下述条件中的一种或多种满足时认为监测到了MCG RLF：当PCell中的T310定时器超时、当PCell中的T312定时器超时、当收到从MCG的媒体介入控制(Medium Access Control，MAC)层来的随机接入问题指示且此时T300，T301，T304，T311和T319定时器都不在运行、或当收到来自MCG无线链路控制(Radio Link Control，RLC)层的指示信息指示了最大重传次数已达到。
步骤2：若T316被配置，且若SCG传输(SCG transmission)不被挂起或若SCG传输被挂起是由于SCG被去激活，且若没有正在进行的PSCell变更过程(即对于SCG的T304定时器或T307定时器不是正在运行)，则发起MCG失败信息过程；否则发起RRC连接重建 立过程。
其中，所述“若SCG传输被挂起是由于SCG被去激活”，还可表述为若SCG传输不是由于SCG失败而被挂起。所述SCG失败指的发生了SCG失败信息过程。优选地，所述SCG失败信息过程是由于监测到了SCG的RLF而发起的；备选地，是由于发生了SCG的同步重配置失败、SCG配置失败或从SCG底层收到了关于SRB3的完整性检查失败指示。
步骤3：在所述MCG失败信息过程中，如初始化MCG失败信息过程时，激活SCG。所述激活SCG包括恢复SCG传输。通过激活该SCG传输，UE在SRB3或分裂SRB1的SCG侧发起MCG失败信息RRC消息的发送，以此告知网络侧所述MCG失败。
所述激活SCG至少包括恢复SCG的SRB，如SRB1和/或SRB3。
可选地，还包括步骤4，UE收到来自网络侧的响应RRC消息，并执行所述RRC消息。所述响应消息可以是用于指示切换的RRC连接重配置消息(携带了用于MCG的reconfigurationwithsync信息元素)，也可以是用于指示UE释放/挂起RRC连接的RRC连接释放消息。除此之外，步骤4还可以是T316超时，UE未收到来自网络侧的响应RRC消息，发起RRC连接重建立过程。
所述MCG失败信息过程也称为快速MCG链路恢复过程。
如前所述，UE通常在下述条件满足时才发起MCG失败信息过程：UE被配置了快速MCG链路恢复的参数即定时器T316、UE被配置了分离SRB或SRB3、MCG和SCG都不在被挂起(not suspended)状态、定时器T316不在运行状态。
定时器T316用于监测MCG失败信息过程。UE在发送MCGfailureinformation消息时启动T316。在恢复MCG传输时或收到网络侧的响应RRCrelease消息时或发起RRC重建立过程时停止T316。当T316超时，UE认为快速MCG链路恢复过程失败结束，从而触发RRC重建立过程来尝试恢复和网络侧的连接。
实施例2
在该实施例中，为了避免UE在发生MCG失败时无法通过被去激活的SCG链路而执行快速MCG链路恢复，对网络侧的配置进行一定限制。所述限制是网络侧不会在给UE使能/配置了快速MCG恢复机制的情况下同时去激活SCG。优选地，所述能/配置了快速MCG恢复机制即配置了T316。通过这样的配置限制，使得UE在MCG失败时，若配置了快速MCG链路恢复，其SCG总是处于激活状态，从而保证能够执行快速MCG链路恢复机制。
优选地，若UE在配置了快速MCG恢复时，收到了网络侧用于去激活SCG的命令，则UE忽略所述SCG去激活命令。备选地，若UE在SCG去激活状态下收到了用于配置快速MCG恢复的RRC消息，则UE忽略该配置或认为RRC重配置失败。若UE收到的同一条RRC消息中同时有快速MCG恢复的使能配置和SCG的去激活指示，则UE认为RRC重配置失败。
在当前的3GPP进展中，SCG激活去激活时的UE行为尚未有定论。本公开中，也并不限定UE在处于SCG激活状态和SCG去激活状态时的具体行为。
作为示例，当UE将一个SCG从去激活状态变更到激活状态时，UE执行下述操作的一项或多项：
操作1：激活SCG中所有的SCell，在MAC层或RRC层执行；
操作2：激活该SCG对应的PSCell，在MAC层或RRC层执行；
操作3：激活由firstActiveDownlinkBWP-Id信息元素和/或firstActiveDownlinkBWP-Id信息元素分别所指示的下行BWP和上行BWP；其中firstActiveDownlinkBWP-Id信息元素和firstActiveDownlinkBWP-Id信息元素由网络侧通过RRC信令(如RRC重配置消息)配置，用于指示当执行所述RRC信令的配置时所激活的下行/上行BWP标识或者当MAC层激活一个SCell或PSCell时所使用的下行/上行BWP标识，在MAC层执行；
操作4：启动或重启与Scell或PSCell所关联的 sCellDeactivationTimer定时器；其中，所述sCellDeactivationTimer用于SCell或PSCell的激活去激活状态控制，当其超时时，UE认为所关联的小区处于去激活状态，当其运行时，UE认为所关联的小区处于激活状态。在UE MAC层执行。在另一种方式中，该操作中包括启动所重启与SCG所关联的SCGdeactivationTimer定时器，其中，所述sCellDeactivationTimer用于SCG的激活去激活状态控制，当其超时时，UE认为所关联的SCG处于去激活状态，当其运行时，UE认为所关联的SCG处于激活状态。在又一种方式中，该操作中包括停止SCG激活去激活定时器，所述SCG激活去激活定时器用于SCG的激活去激活状态控制，当其超时时，UE认为所关联的SCG处于激活状态，UE执行包括该实施例中所述的从SCG去激活状态到激活状态的状态变更操作；当其运行时，UE认为所关联的SCG处于去激活状态。
操作5：初始化或重新初始化SCell或PSCell所关联的所挂起的类型1配置的上行许可；在UE MAC层执行
优选地，上述操作3～5在所述firstActiveDownlinkBWP-Id不设置为休眠BWP时执行。可选地，当所述SCG激活命令是MAC CE或RRC信令时，所述SCG激活命令中，除了指示PSCell/SCG的状态是激活外，还单独指示每一个SCG SCell的激活状态是激活或者去激活。在这种情况下，操作1中的SCell指的是所有激活状态指示为激活的SCell，上述操作3～5也是对所有激活状态指示为激活的SCell所执行的。
操作6：恢复SCG所关联的所有DRB和SRB。其中包括分裂承载的SCG部分。在UE的RRC层执行
操作7：启动或重新启动用于SCG/PSCell或PSCell所述上行时间提前组(Timing Advance Group，TAG)所关联的用于上行时间对齐的上行时间对齐定时器timeAlighmentTimer；在UE的MAC层执行
操作8：执行重置MAC实体的操作；优选地，所述重置MAC实体的操作不包括取消所触发的缓存状态报告过程(Buffer Status Report，BSR)。在UE的MAC层执行。
操作9：触发PSCell的随机接入过程。可选地，UE基于SCG激活命令中的随机接入指示信息来确定是否执行随机接入过程。当SCG激活命令中的随机接入指示信息存在或置为TRUE或1时，或者SCG激活命令中的随机接入参数被配置在SCG激活命令中，则UE执行PSCell的随机接入过程。所述随机接入参数(RACH-ConfigDeadicated信息元素标识)指的是执行RACH过程的物理随机接入信道PRACH时频资源、同步信号块(Synchronization Signal Block，SSB)/信道状态信息参考信号(Channel Status Information Reference Signal，CSIRS)的参考信号接收功率(Reference Signal Received Power，RSRP)门限值配置和优先参数(如ra-Prioritization信息元素)等。可选地，若PSCell所关联的上行时间对齐定时器处于非运行状态，则UE执行随机接入，否则UE不执行随机接入。
操作10：若所述SCG激活的命令是通过接收到的MAC CE获得的，或者所述SCG激活的决定是由MAC实体所确定的，如当触发了BSR，或触发了随机接入过程，则MAC实体向上层(如RRC层)指示所述SCG激活的信息。
操作11：若所述SCG激活的命令是通过物理层信令DCI获得的，如包含在DCI中的SCG激活域指示为SCG激活或包含在DCI中的BWP标识指示所述BWP不是休眠BWP，则物理层向上层(如MAC层或RRC层)指示所述SCG激活的信息或所述PSCell激活的信息或所述BWP变更的信息。优选地，所述DCI指用于所述SCG的PSCell或SCell的DCI，此时所述BWP指的是所述PSCell或所述SCell所配置的BWP。
操作12：若所述SCG激活的命令是通过接收到的RRC信令获得的，或者所述SCG激活的决定是由RRC所确定的，如当触发了CPC执行过程，则RRC层向下层(如MAC层)指示所述SCG激活的信息。所述SCG激活的信息也可以表述为所述PSCell激活的信息。
UE在收到SCG激活命令时执行上述从SCG去激活状态到SCG激活状态的操作，或者UE的MAC层或RRC层在收到操作10～12的 层间交互指示信息如指示SCG激活的信息时，执行上述相关操作。
操作13：开始对SCG链路的无线链路监测(Radio Link Monitor，RLM)；
操作14：从放松需求(relaxed requirement)的无线资源管理(Radio Resource Management，RRM)测量转到执行正常的SCG的RRM测量。
操作15：开始对SCG链路执行波束失败监测和可能的波束失败恢复。
操作16：开始上行探测信号(Sounding Reference Signal，SRS)的发送。
作为示例，当UE将一个SCG从激活状态变更去到激活状态时，UE执行下述操作的一项或多项：
操作1：去激活SCG中所有的SCell，在MAC层或RRC层执行；
操作2：去激活该SCG对应的PSCell，在MAC层或RRC层执行；
操作3：去激活SCG的PSCell或SCell的所有BWP，在MAC层执行；
操作4：停止Scell或PSCell或SCG所关联的sCellDeactivationTimer定时器；其中，所述sCellDeactivationTimer用于SCell或PSCell或SCG的激活去激活状态控制，当其超时时，UE认为所关联的小区或SCG处于去激活状态。在UE MAC层执行。在一种方式中，该操作中包括启动SCG激活去激活定时器，所述SCG激活去激活定时器用于SCG的激活去激活状态控制，当其超时时，UE认为所关联的SCG处于激活状态，UE执行包括该实施例中所述的从SCG去激活状态到激活状态的状态变更操作；当其运行时，UE认为所关联的SCG处于去激活状态。
操作5：挂起SCell或PSCell所关联的所挂起的类型1配置的上行许可和/或下行分配，清除响应的类型2配置的上行许可；在UE MAC层执行。
操作6：挂起所有SCG所关联的DRB和SRB。其中包括分裂承 载的SCG部分。在UE的RRC层执行。
操作7：停止用于SCG所关联的用于上行时间对齐的上行时间对齐定时器；在UE的MAC层执行。在另一种方式中，该操作还可以执行为对上行时间对齐定时器timeAlignmentTimer应用SCG去激活相关联的定时器值。所述定时器的值指用于配置定时器时长的值(以TAG-Config信息元素中的timeAlignmentTimer信息元素来配置)；所述定时器指SCG的PSCell或SCell所关联的TAG对应的定时器。所述SCG去激活相关联的定时器值，指所述定时器的时长值在SCG去激活状态下的配置不同于SCG激活状态下所使用的定时器时长值。
操作8：执行重置MAC实体的操作；在UE的MAC层执行。
操作9：若所述SCG去激活的命令是通过接收到的MAC CE获得的，或者所述SCG去激活的决定是由MAC实体所确定的，如当PSCell所关联的去激活定时器超时或则SCG去激活所关联的定时器超时，则MAC实体向上层(如RRC层)指示所述SCG去激活的信息。
操作10：若所述SCG去激活的命令是通过物理层信令DCI获得的，如包含在DCI中的SCG去激活域指示为SCG去激活或包含在DCI中的BWP标识指示所述BWP是休眠BWP，则物理层向上层(如MAC层或RRC层)指示所述SCG去激活的信息或所述PSCell去激活的信息或所述BWP变更的信息。优选地，所述DCI指用于所述SCG的PSCell或SCell的DCI，此时所述BWP指的是所述PSCell或所述SCell所配置的BWP。。
操作11：若所述SCG去激活的命令是通过接收到的RRC信令获得的，或者所述SCG去激活的决定是由RRC所确定的，如当触发了CPC执行过程，则RRC层向下层(如MAC层)指示所述SCG去激活的信息。所述SCG去激活的信息也可以表述为所述PSCell去激活的信息。
操作12：若一个DRB或SRB被配置为分裂承载，若其主路径信息元素primaryPath设置为SCG，则设置主路径或primarypath信息元素为MCG。优选地，该操作在所述RB未被配置PDCP重复(由 pdcp-Duplication信息元素指示)时执行。其中primarypath信息元素用于指示当一个承载的PDCP实体关联了多于一个RLC实体时用于上行发送的主要RLF实体的逻辑信道标识和小区组标识。
操作13：将SCG的PSCell和/或SCell的当前激活的工作BWP变更为休眠BWP。
UE在收到SCG去激活命令时或者所述UE判断SCG去激活时(如上述对应的去激活定时器超时)执行上述从SCG激活状态到SCG去激活状态的操作，或者UE的MAC层或RRC层在收到操作9～11的层间交互指示信息如指示SCG去激活的信息时，执行上述相关操作。
所述SCG激活/去激活命令可以包含在RRC信令、MAC CE或物理层L1信令DCI中。在一种方式中，SCG去激活命令中可以指示PSCell或每一个SCell的状态，如指示所述小区是去激活状态，或指示所述小区变更激活的工作BWP为休眠BWP。
操作14：停止对SCG链路的无线链路监测(Radio Link Monitor，RLM)；
操作15：从正常的SCG的RRM测量转到执行放松需求的无线资源管理(Radio Resource Management，RRM)测量。
操作16：停止对SCG链路执行波束失败监测和可能的波束失败恢复。
操作17：停止上行探测信号(Sounding Reference Signal，SRS)的发送。
作为示例，处于SCG去激活状态下的UE操作包括下述一项或多项：
不在SCG的PSCell和SCell上发送SRS；
不上报用于SCG的PSCell和SCell的CSI；
不在SCG的PSCell和SCell上发送UL-SCH；
不在SCG的PSCell和SCell上发送RACH；
不在SCG的PSCell和SCell上监听PDCCH；
不监听用于SCG的PSCell和SCell的PDCCH；
不在SCG的PSCell和SCell上发送PUCCH；
不在SCG的PSCell和SCell上接收UL-SCH；
不执行用于SCG的PSCell和/或SCell的波束失败检测和波束失败恢复过程；
SCG所关联的DRB或SRB处于挂起状态；
不触发BSR；
不触发用于功率余量报告的PHR过程；
SCG的PSCell和SCell工作在所述小区对应的休眠BWP上。
不对SCG链路的无线链路监测RLM；
不执行正常的SCG的RRM测量，而是执行放松需求的无线资源管理RRM测量。
不执行对SCG链路执行波束失败监测和可能的波束失败恢复。
不执行上行探测信号(Sounding Reference Signal，SRS)的发送。
作为示例，处于SCG激活状态下的UE执行正常的SCG的PSCell和SCell的通信操作，包括下述一项或多项：
在SCG的PSCell和SCell上发送SRS；
上报用于SCG的PSCell和SCell的CSI；
在SCG的PSCell和SCell上发送UL-SCH；
在SCG的PSCell和SCell上发送RACH；
在SCG的PSCell和SCell上监听PDCCH；
监听用于SCG的PSCell和SCell的PDCCH；
在SCG的PSCell和SCell上发送PUCCH；
在SCG的PSCell和SCell上接收UL-SCH；
执行用于SCG的PSCell和/或SCell的波束失败检测和波束失败恢复过程；
SCG所关联的DRB或SRB处于非挂起状态；
SCG的PSCell和SCell不工作在所述小区对应的休眠BWP上。
此外，在SCG处于激活状态下仅限定PSCell处于激活状态或PSCell不工作在休眠BWP上，允许一个或多个SCell处于去激活状态或者工作在休眠BWP上，此时上述操作中的一项或多项是对于处于激活态的PSCell和SCell或工作在非休眠BWP上的SCell而言的。
执行对SCG链路的无线链路监测RLM；
执行正常的SCG的RRM测量。
对SCG链路执行波束失败监测和可能的波束失败恢复。
执行上行探测信号(Sounding Reference Signal，SRS)的发送。
在本公开中，“基站”是指具有较大发射功率和较广覆盖面积的移动通信数据和控制交换中心，包括资源分配调度、数据接收发送等功能。“用户设备”是指用户移动终端，例如包括移动电话、笔记本等可以与基站或者微基站进行无线通信的终端设备。
上文已经结合优选实施例对本公开的方法和涉及的设备进行了描述。本领域技术人员可以理解，上面示出的方法仅是示例性的。本公开的方法并不局限于上面示出的步骤和顺序。上面示出的基站和用户设备可以包括更多的模块，例如还可以包括可以开发的或者将来开发的可用于基站、MME、或UE的模块等等。上文中示出的各种标识仅是示例性的而不是限制性的，本公开并不局限于作为这些标识的示例的具体信元。本领域技术人员根据所示实施例的教导可以进行许多变化和修改。
运行在根据本公开的设备上的程序可以是通过控制中央处理单元(CPU)来使计算机实现本公开的实施例功能的程序。该程序或由该程序处理的信息可以临时存储在易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器系统中。
用于实现本公开各实施例功能的程序可以记录在计算机可读记录介质上。可以通过使计算机系统读取记录在所述记录介质上的程序并执 行这些程序来实现相应的功能。此处的所谓“计算机系统”可以是嵌入在该设备中的计算机系统，可以包括操作系统或硬件(如外围设备)。“计算机可读记录介质”可以是半导体记录介质、光学记录介质、磁性记录介质、短时动态存储程序的记录介质、或计算机可读的任何其他记录介质。
用在上述实施例中的设备的各种特征或功能模块可以通过电路(例如，单片或多片集成电路)来实现或执行。设计用于执行本说明书所描述的功能的电路可以包括通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、或其他可编程逻辑器件、分立的门或晶体管逻辑、分立的硬件组件、或上述器件的任意组合。通用处理器可以是微处理器，也可以是任何现有的处理器、控制器、微控制器、或状态机。上述电路可以是数字电路，也可以是模拟电路。因半导体技术的进步而出现了替代现有集成电路的新的集成电路技术的情况下，本公开的一个或多个实施例也可以使用这些新的集成电路技术来实现。
此外，本公开并不局限于上述实施例。尽管已经描述了所述实施例的各种示例，但本公开并不局限于此。安装在室内或室外的固定或非移动电子设备可以用作终端设备或通信设备，如AV设备、厨房设备、清洁设备、空调、办公设备、自动贩售机、以及其他家用电器等。
如上，已经参考附图对本公开的实施例进行了详细描述。但是，具体的结构并不局限于上述实施例，本公开也包括不偏离本公开主旨的任何设计改动。另外，可以在权利要求的范围内对本公开进行多种改动，通过适当地组合不同实施例所公开的技术手段所得到的实施例也包含在本公开的技术范围内。此外，上述实施例中所描述的具有相同效果的组件可以相互替代。

Claims (9)

  1. 一种由用户设备执行的方法，包括：
    检测到发生了MCG失败；
    若T316被配置，且若SCG传输不被挂起或若SCG传输被挂起是由于SCG被去激活，则发起MCG失败信息过程；否则发起RRC连接重建立过程。
  2. 根据权利要求1所述的由用户设备执行的方法，其特征在于，
    在所述MCG失败信息过程中，激活SCG。
  3. 根据权利要求1所述的由用户设备执行的方法，其特征在于，
    发起所述MCG失败信息过程是在没有正在进行的PSCell变更过程时执行。
  4. 根据权利要求1所述的由用户设备执行的方法，其特征在于，
    所述MCG失败指的是无线链路失败。
  5. 根据权利要求1所述的由用户设备执行的方法，其特征在于，
    所述SCG传输被挂起是由于SCG被去激活是指所述SCG传输不是由于SCG失败而被挂起。
  6. 根据权利要求5所述的由用户设备执行的方法，其特征在于，
    所述SCG失败指的是发生了SCG失败信息过程。
  7. 根据权利要求6所述的由用户设备执行的方法，其特征在于，
    所述SCG失败信息过程是由于监测到了SCG的RLF、发生了SCG的同步重配置失败、SCG配置失败或从SCG底层收到了关于信令无线承载SRB3的完整性检查失败指示其中的一项或多项而发起的。
  8. 根据权利要求2所述的由用户设备执行的方法，其特征在于，
    所述激活SCG至少包括恢复SCG的SRB。
  9. 一种用户设备，包括：
    处理器；以及
    存储器，存储有指令；
    其中，所述指令在由所述处理器运行时执行根据权利要求1至8中任一项所述的方法。
PCT/CN2021/137403 2020-12-15 2021-12-13 由用户设备执行的方法以及用户设备 WO2022127730A1 (zh)

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