CN119450813A

CN119450813A - Method executed by user equipment and user equipment

Info

Publication number: CN119450813A
Application number: CN202310961144.2A
Authority: CN
Inventors: 刘蕾; 刘仁茂
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2023-08-01
Filing date: 2023-08-01
Publication date: 2025-02-14
Also published as: WO2025026391A1

Abstract

The invention provides a method executed by user equipment and the user equipment. The method executed by the user equipment comprises the following steps that the user equipment receives an RRC message sent by a network, the user equipment executes a synchronous reconfiguration process under the condition that the RRC message carries synchronous reconfiguration, and the user equipment monitors and receives Cell DTX/DRX activation/deactivation indication information in a target Cell, wherein the RRC message comprises at least one of Cell DTX/DRX configuration information of the target Cell, an activation state indication of a Cell DTX/DRX function of the target Cell, a first value of T304 and a second value of T304.

Description

Method executed by user equipment and user equipment

Technical Field

The present invention relates to the field of wireless communication technology, and more specifically, to a method for cell change performed by a user equipment and a corresponding user equipment.

Background

Network energy conservation is beneficial to reducing environmental impact and saving operator costs. By elongating the time interval of the base station when continuously receiving and transmitting data and closing the transmission and reception of partial symbols, the base station can be put into a dormant state or the cell where the base station is put into a network energy-saving mode, thereby reducing the power consumption of the base station and achieving the purpose of network energy saving. For the reasons stated above, at month 2022, 12, at third generation partnership project (3rd Generation Partnership Project:3GPP) RAN#98e, a project for NR network energy conservation work of release 18 (see non-patent document: RP-223540New WID:Network energy savings for NR) was approved. One of the goals of the work item is to enhance cell DRX and cell DTX in RRC connected state, i.e. network discontinuous reception and network discontinuous transmission, so as to achieve the purpose of network energy saving.

The introduction of layer 1 layer 2 triggered mobility (LTM) mechanisms is under discussion in release 18 NR systems. The purpose of this mechanism is to reduce mobility latency. In the NR system before release 18, mobility is achieved mainly by RRC layer signaling triggered handover (also called synchronous reconfiguration) based on layer 3 measurements. In the handover process, the UE (hereinafter referred to as "UE") releases the source serving cell, adds the target serving cell, and needs to perform the complete layer 2 and layer 1 reset operations. This results in longer mobility procedure delays, higher overhead and longer data interruption times. In the LTM mechanism, RRC configuration of the target candidate cell is issued to the UE in advance, and cell change is triggered through layer 1/layer 2 signaling based on a layer 1 measurement result, so that the purposes of reducing time delay, cost and interruption time are achieved.

The present invention discusses how the UE performs handover and CELL SWITCH after introducing cell DRX and/or cell DTX. According to the invention, the influence on the switching of the UE or the performance of CELL SWITCH caused by the non-active period of the Cell DRX/DTX can be avoided.

Disclosure of Invention

The present invention provides a method performed by a user equipment for solving the problem of how a UE performs handover and how CELL SWITCH is performed after introducing cell DRX and/or cell DTX.

According to one aspect of the invention, a method executed by user equipment is provided, comprising the steps that the user equipment receives an RRC message sent by a network, the user equipment executes a synchronous reconfiguration process when the RRC message carries synchronous reconfiguration, and the user equipment monitors and receives Cell DTX/DRX activation/deactivation indication information in a target Cell, wherein the RRC message comprises at least one of Cell DTX/DRX configuration information of the target Cell, an activation state indication of a Cell DTX/DRX function of the target Cell, a T304 first value and a T304 second value.

In the above method performed by the ue, it is preferable that the ue starts a timer T304 in a synchronization reconfiguration process, and the value of the timer T304 is set to a T304 first value in a case where at least one of a Cell DTX/DRX configuration information of the target Cell is included in the RRC message, the target Cell is configured with Cell DTX/DRX, and a Cell DTX/DRX function of the target Cell is activated, and the value of the timer T304 is set to a T304 second value in a case where at least one of a Cell DTX/DRX configuration information of the target Cell is not included in the RRC message, a Cell DTX/DRX configuration deletion/release information of the target Cell is not configured in the RRC message, and a Cell DTX/DRX function of the target Cell is deactivated or not activated.

In the above method performed by the user equipment, it is preferable that the user equipment judges at least one of the conditions that the T304 timer is in operation, the value of the T304 timer is set to the T304 second value during the synchronization reconfiguration performed by the user equipment, and the Cell DTX/DRX activation/deactivation indication information indicates that the Cell DTX/DRX function of the target Cell is activated, and in the case that the user equipment judges that at least one of the conditions is satisfied, the user equipment performs at least one of the operations that the T304 timer is restarted, and the duration of the T304 timer in operation is prolonged.

According to one aspect of the invention, a method executed by user equipment is provided, which comprises the following steps that the user equipment receives LTM configuration sent by a network side, the user equipment receives LTM CELL SWITCH commands sent by the network side and executes LTM CELL SWITCH processes, the user equipment monitors and receives Cell DTX/DRX activation/deactivation indication information in a target Cell, and in the condition that the LTM configuration is sent to the user equipment through RRC information, at least one of Cell DTX/DRX configuration information of an LTM candidate Cell, activation state indication of a Cell DTX/DRX function of the LTM candidate Cell, CELL SWITCH timer first value corresponding to the LTM candidate Cell and CELL SWITCH timer second value corresponding to the LTM candidate Cell is contained in the RRC information.

In the method executed by the ue, it is preferable that the LTM CELL SWITCH command sent by the ue on the network side includes at least one of Cell DTX/DRX configuration information of the target Cell, an activation state indication of the Cell DTX/DRX function of the target Cell, a first value of CELL SWITCH timer, a second value of CELL SWITCH timer, and a value of time advance TA of the target Cell.

In the above method performed by the user equipment, it is preferable that the user equipment starts CELL SWITCH timer in the process of performing LTM CELL SWITCH by the user equipment, the value of CELL SWITCH timer is set to a first value of CELL SWITCH timer of the target Cell in case that at least one of the following conditions is satisfied, the target Cell is configured with Cell DTX/DRX, and the Cell DTX/DRX function of the target Cell is activated, and the value of CELL SWITCH timer is set to a second value of CELL SWITCH timer of the target Cell in case that at least one of the following conditions is satisfied, the target Cell is not configured with DTX/DRX, and the Cell DTX/DRX function of the target Cell is deactivated or not activated.

In the above method performed by the ue, it is preferable that the ue determines at least one of the conditions that the CELL SWITCH timer is running, that the value of the CELL SWITCH timer is set to CELL SWITCH timer second value during the ue performing LTM CELL SWITCH, and that the Cell DTX/DRX activation/deactivation indication information indicates that the Cell DTX/DRX function of the target Cell is activated, and that the ue performs at least one of the operations that the CELL SWITCH timer is restarted and that the duration of the CELL SWITCH timer running is prolonged in case the ue determines that at least one of the conditions is satisfied.

In the above method performed by the user equipment, it is preferable that the user equipment initiates RACH-LESS LTM CELL SWITCH procedure in a case where at least one of a Cell DTX/DRX configuration of the target Cell, a Cell DTX/DRX activation of the target Cell, and a value of a time advance TA of the target Cell is included in the LTM CELL SWITCH command and is an active value in the user equipment performs LTM CELL SWITCH procedure, and the user equipment initiates a random access procedure to the target Cell in a case where at least one of a Cell DTX/DRX configuration of the target Cell is not configured, a Cell DTX/DRX activation of the target Cell is deactivated or not activated, and a value of a time advance TA of the target Cell is included in the LTM CELL SWITCH command is an inactive value in the user equipment performs LTM CELL SWITCH procedure.

In the above method performed by the ue, it is preferable that the ue determines at least one of the conditions that the CELL SWITCH timer is running, that the ue is performing RACH-LESS LTM CELL SWITCH procedure, and that the Cell DTX/DRX activation/deactivation indication information indicates that the Cell DTX/DRX function of the target Cell is activated, and that the ue performs at least one of the operations that the RACH-LESS LTM CELL SWITCH procedure is stopped, that the random access procedure is initiated in the target Cell, and that the CELL SWITCH timer is restarted, if the ue determines that at least one of the conditions is satisfied.

According to another aspect of the invention there is provided a user equipment comprising a processor and a memory storing instructions which when executed by the processor perform a method performed by the user equipment according to any of the above aspects.

According to the method executed by the user equipment and the user equipment, the influence on the switching of the UE or the performance of CELL SWITCH caused by the non-active period of the Cell DRX/DTX can be avoided.

Drawings

The foregoing and other features of the invention will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings in which:

Fig. 1 is a flowchart showing a change of a serving cell by a UE in an RRC connected state through a handover procedure.

Fig. 2 is a flowchart showing a method performed by a user equipment according to embodiment 1 of the present invention.

Fig. 3 is a flowchart showing a method performed by a user equipment according to embodiment 2 of the present invention.

Fig. 4 is a flowchart showing a method performed by the user equipment according to embodiment 3 of the present invention.

Fig. 5 is a flowchart showing a method performed by the user equipment according to embodiment 4 of the present invention.

Fig. 6 is a schematic block diagram of a user equipment UE according to the present invention.

Detailed Description

The invention is described in detail below with reference to the drawings and the detailed description. It should be noted that the present invention should not be limited to the specific embodiments described below. In addition, for the sake of brevity, detailed descriptions of well-known techniques, which are not directly related to the present invention, are omitted to prevent confusion of the understanding of the present invention.

The following describes some terms related to the present invention, the specific meaning of the terms is found in the 3GPP latest standard specification,

UE User Equipment

New Radio technology

MAC Medium Access Control multimedia access control

MAC CE MAC control elementMAC control element

RRC Radio Resource Control radio resource control

RRC_CONNECTED RRC CONNECTED state

RRC_INACTIVE RRC INACTIVE state

RRC_IDLE RRC Idle state

RAN Radio Access Network, radio access layer

PDCCH Physical downlink control channel physical downlink control channel

PUCCH Physical Uplink Control Channel physical uplink control channel

PUSCH Physical Uplink SHARED CHANNEL Physical Uplink shared channel

PBCH Physical broadcast channel physical broadcast channel

SFN SYSTEM FRAME Number system frame Number

PDU Protocol Data Unit protocol data unit

SSB, SS/PBCH block, synchronization signal/physical broadcast channel block

DCI downlink control information

C-RNTI cell radio network temporary identity

RSRP REFERENCE SIGNAL RECEIVED Power reference Signal received Power

RSRQ REFERENCE SIGNAL RECEIVED Quality reference signal receiving Quality

SpCell SPECIAL CELL Special cells, including PCell and PSCell

DC Dual Connectivity double connection

MCG MASTER CELL Group master cell Group

SCG Secondary Cell Group Secondary cell group

PCell PRIMARY CELL Main cell

PSCell PRIMARY SCG CELL SCG Main cell

MIB Master Information Block, master message Block

DRX Discontinuous Reception discontinuous reception

DTX:Discontinuous Transmission

SIB System Information Block System message Block

NES network ENERGY SAVING, energy-saving network

GNB the next Generation Node B, next generation base station

RLF Radio Link Failure radio link failure

SN Sequence Number, sequence Number

CN Core Network, core Network

SR Scheduling Request, scheduling request

UL-SCH: uplink SHARED CHANNEL Uplink shared channel

BWP Bandwidth Part, bandwidth Part

CSI CHANNEL STATE Information, channel State Information

SRS Sounding REFERENCE SIGNAL, channel Sounding reference signal

LTM L1/L2 TRIGGERED MOBILITY, layer 1/layer 2 triggered mobility

L1:Layer 1, layer 1

L2:Layer 2, layer 2

TA TIMING ADVANCE time Advance

RACH (Random access channel) Random ACCESS CHANNEL

PRACH Physical Random ACCESS CHANNEL, physical Random access channel

In the present invention, a network (network or NW), a base station (base station or gNB or eNB), and a RAN are used interchangeably, where the network may be a long term evolution LTE network, a New radio access technology (NR) network, an enhanced long term evolution eLTE network, or other networks defined in a later evolution version of 3 GPP. The base station in the present invention may be any type of base station including Node B, enhanced base station eNB, 5G communication system base station gNB, or micro base station, pico base station, macro base station, home base station, etc., and the network is generally referred to as a base station or a cell. The cell may also be a cell under any of the above base stations, and the cell, beam (beam), transmission point (Transmission Point, TRP) may be interchanged, and the base station may also be a Central Unit (gNB-Central Unit, gNB-CU) or a Distributed Unit (gNB-Distributed Unit, gNB-DU) constituting the base station, unless otherwise specified.

In the present invention, the UE may refer to a device supporting network energy saving, or may refer to a device supporting Cell DRX and/or Cell DTX, or may refer to a device supporting LTM, or may refer to a device supporting RACH-LESS LTM CELL SWITCH, or may refer to other types of NR devices or LTE devices.

In the present invention, "feedback", "submit", "report", "send", "transmission", "notification", "inform", "instruction (indicate)", and "provide" are used interchangeably. "use", "make available, make available", "apply", "enable", "activate", "execute", "do", etc. may be used interchangeably.

In the present invention, "association (associate)", "correspondence (correspond)", and "map" are used interchangeably.

In the present invention, the configuration (reconfigure) and reconfiguration (reconfigure) may be replaced with each other. Reception (receiver), detection (detector), monitor (monitor), decoding (decoder) may be substituted for each other.

In the present invention, the activation period and the activation time may be used interchangeably, and the deactivation period and the deactivation time may be used interchangeably, and the "deactivation (or deactive)" and the "sleep" may be used interchangeably. In the present invention, the "time" may be a time point, a duration (duration), a period (period), or the like.

In the present invention, "Cell DTX/DRX" refers to "Cell DTX and/or Cell DRX". In the present invention, "LTM CELL SWITCH" refers to CELL SWITCH based on LTM mechanism, which may include LTM CELL SWITCH that needs to initiate a random access procedure to a target cell, or RACH-LESS LTM CELL SWITCH that does not need to initiate a random access procedure to a target cell.

In the present invention, "handover" and "sync reconfiguration (reconfiguration with sync)" may be used interchangeably.

In the present invention, the "LTM candidate cell" may refer to the "LTM target candidate cell", i.e., LTM CELL SWITCH to the target cell may be one of the LMT candidate cells.

In the present specification, the terms "and", "or", "and/or" may be used to denote different expressions which are used to describe the same meaning in different application scenarios, and the terms may be used to denote a relationship between the terms.

Hereinafter, a description is given of the related art of the present invention.

Switch (handle)

When a UE in RRC connected state moves from the coverage area of one cell to the coverage area of another cell, the base station or the network side typically instructs the UE to perform a handover operation in order to ensure service continuity.

The handover refers to a change of a primary cell initiated by a network side, and the change of the primary cell including inter-cell also includes a change of the primary cell in the cell, that is, the primary cell of the UE is changed from a source cell to a target cell, where the source cell and the target cell may be the same cell or different cells, and in this process, a secret key or a security algorithm for access layer security may be updated accordingly. The source cell is also called a source base station, and may be a source beam (beam), a source transmission point (Transmission point, TRP), and a source master cell Group (MASTER CELL Group, MCG). The target cell may also be referred to as a target base station, and may also be a target beam, a target transmission point, or a target MCG. The source cell refers to a cell serving the UE connected before the handover procedure is initiated, i.e., a cell in which the UE receives an RRC message containing a handover command. The target cell refers to a cell connected by the UE and serving the UE after the handover procedure is successfully completed, or a cell indicated by a target cell identifier included in the handover command, and a cell accessed by the UE when the UE receives the handover. The handover command is used to trigger the UE to perform a handover, in the NR system, an RRC reconfiguration message containing a synchronous reconfiguration (Reconfigurationwithsync) cell. Further, for handover of the primary cell, is an RRC reconfiguration message containing a synchronous reconfiguration (Reconfigurationwithsync) cell for the primary cell Group (MASTER CELL Group, MCG). At this time, the handover may also be referred to as synchronous reconfiguration of the MCG. The synchronization reconfiguration cell includes configuration information of the target cell, for example, target cell identification, target cell frequency, public configuration of the target cell such as system information, random access configuration used by the UE accessing the target cell, security parameter configuration of the UE in the target cell, radio bearer configuration of the UE in the target cell, and the like.

The user mobility in the connected state is mainly achieved through a handover procedure, which refers to a procedure in which the UE in the RRC connected state changes the serving cell. Fig. 1 shows a flowchart of changing a serving cell by a UE in an RRC connected state through a handover procedure. As shown in fig. 1, the handover procedure generally includes the following phases:

Stage 1. Measurement stage. And the UE measures the wireless links of the service cell or the neighbor cell based on the measurement configuration, and when the configured measurement report condition is met, the UE sends a measurement report to the base station.

And 2, switching preparation. The base station determines whether to trigger a handover for the UE in conjunction with the received measurement report and other factors such as the base station load. If the trigger for the UE is determined, the source base station initiates a handover preparation procedure by sending a handover request message to the target base station. The target base station decides whether to accept the current switching request to the UE according to the context of the UE in the switching request message and the available resources of the target base station, if so, the target base station replies a switching confirmation message to the source base station, wherein the switching confirmation message comprises an inter-base station (inter-node) RRC message, namely a switching command.

And 3, switching the execution stage. The source base station issues a handover command to the UE and starts forwarding data of the UE to the target base station. The UE receiving the switching command immediately applies the configuration of the switching command to execute switching, accesses to the target base station through the random access process, and sends a confirmation message to the target base station. Wherein a random access procedure is not necessary.

And 4, switching to finish the stage. And after the target base station confirms that the UE is successfully accessed, the target base station sends a switching completion message to the source base station. The source base station may release the UE context stored thereon accordingly.

The UE detects the switching process through a timer T304, when the switching process is started, the UE starts the T304 timer, when the switching process is completed, the UE stops the timer T304, and when the T304 is overtime, the UE considers that the switching is failed.

The handover command described in phase 3 is layer 3 signaling, i.e. RRC message.

LTM

LTM refers to the UE triggering mobility operation upon receiving L1/L2 signaling (e.g., MAC CE), i.e., triggering cell change. Cell change using LTM mechanism may be referred to as LTM cell transition (LTM CELL SWITCH) to distinguish from handover (handover).

The network side sends the LTM configuration to the UE through RRC signaling (e.g., RRC reconfiguration message), where the LTM configuration may include, but is not limited to, LTM candidate cell configuration. And after receiving the LTM configuration, the UE stores the received LTM candidate cell configuration. The LTM candidate cell configuration includes configurations (e.g., configurations included in the RRC reconfiguration message) corresponding to one or more candidate cells. The network determines the target cell for final execution LTM CELL SWITCH based on the layer 1 measurements reported by the UE and triggers LTM CELL SWITCH the procedure by L1/L2 signaling. The L1/L2 signaling used to trigger CELL SWITCH procedure at least includes information of the target cell (e.g., identification or index value of candidate cell (configuration) corresponding to the target cell). The UE triggers LTM CELL SWITCH a procedure, which is performed to the target cell using the saved previously received LTM candidate cell configuration LTM CELL SWITCH.

Wherein, the L1/L2 signaling for triggering CELL SWITCH may be referred to as LTM CELL SWITCH command, and the two terms may be used interchangeably in the present invention. The L/L2 signaling for trigger LTM CELL SWITCH may be a MAC CE or a physical layer indication.

The source cell refers to the cell serving the UE connected prior to the LTM CELL SWITCH procedure initiation, i.e., the cell the UE receives LTM CELL SWITCH command. The target cell refers to a cell connected by the UE to serve the UE after the LTM CELL SWITCH procedure is successfully completed, or the target cell included in the LTM CELL SWITCH command, and/or a cell accessed by the UE when the UE receives L1/L2 signaling of LTM CELL SWITCH. That is, after receiving LTM CELL SWITCH command, the UE will switch from the source cell to the target cell, which continues to provide service to the UE. The candidate cell is a candidate cell that may be a LTM CELL SWITCH target cell.

In the LTM mechanism, the configuration of the candidate cell is issued to the UE in advance, and the subsequent measurement result based on L1 is triggered LTM CELL SWITCH through L1/L2 signaling, so that the time delay of cell change can be reduced, and the signaling overhead and the service interruption time are reduced.

RACH-less LTM

In the random access procedure (Random Access procedure), the UE transmits a random access preamble sequence (preamble) on a transport channel (transport channel) RACH, which may also be considered as a transmission (PRACH transmission) of the PRACH, which is a physical layer random access channel, and the corresponding transport layer channel is RACH. The transmitted random access preamble sequence will be received by the network side, and such PRACH transmission is performed for one of the cells under control of the network side, since the network side can control the coverage of one or more cells.

In the LTM mechanism, in order to further reduce the time delay in the cell change process, the network side may obtain, in advance, the uplink time advance (TIMING ADVANCE, TA) of the candidate cell before triggering the cell change, so that when the UE subsequently executes the LTM CELL SWITCH process to the target cell, the random access process to the target cell may be omitted, and uplink transmission may be directly performed using the obtained uplink TA value. The network side may configure dedicated random access resources to the UE through a physical downlink control channel command (Physical Downlink Control Channel order, PDCCH order) to trigger a random access procedure to one candidate cell. In the corresponding random access process, the UE transmits a random access preamble sequence to the candidate cell. The network receives the random access preamble sequence sent by the UE, and may obtain the TA of the candidate cell, and then may include the TA value in the LTM CELL SWITCH command to inform the UE. After receiving LTM CELL SWITCH the command, if the command LTM CELL SWITCH includes the TA value of the target cell, the UE may omit the random access procedure to the target cell, i.e. execute the LTM CELL SWITCH procedure without random access, RACH-LESS LTM CELL SWITCH procedure.

RACH-LESS LTM CELL SWITCH procedure the UE may send the first uplink data to the target cell through a configured uplink grant sent by the network. Wherein the configured uplink grant may be periodic or disposable, the network may include the configured uplink grant in the LTM configuration, and may include the configured uplink grant in the LTM CELL SWITCH command. Or the UE may also send the first uplink data to the target cell by listening to the PDCCH at the target cell to obtain a dynamic uplink grant.

When LTM CELL SWITCH procedure is triggered (e.g., the RRC layer receives an indication that the MAC layer or physical layer received the LTM CELL SWITCH command on the network side, i.e., the MAC layer or physical layer indication LTM CELL SWITCH is triggered, where the MAC layer or physical layer may be collectively referred to as the lower layers of the RRC layer), the UE (e.g., the RRC layer of the UE) starts CELL SWITCH timer for monitoring LTM CELL SWITCH procedures. When LTM CELL SWITCH flow is completed successfully, the UE stops the CELL SWITCH timer. If the CELL SWITCH timer expires, the UE considers LTM CELL SWITCH procedure to fail. The UE may consider that RACH-LESS LTM CELL SWITCH procedure is successfully completed after receiving PDCCH for (IS ADDRESSED to) C-RNTI in the target cell, or after receiving acknowledgement (e.g., RLC ACK) for RRC reconfiguration complete message in the target cell, or after receiving downlink collision resolution (DL Contention Resolution) MAC CE in the target cell.

Cell DTX

To save power consumption of the network, the network may transmit discontinuously. The network may configure the UE with Cell DTX so that the UE knows how the network is not transmitting continuously within a certain Cell. After the network configures the Cell DTX for the UE, the Cell DTX may be activated by default, or the Cell DTX may be activated and/or deactivated by indicating after configuration. The Cell DTX configuration may include information such as a discontinuous transmission period, a time period for starting transmission, an offset for starting transmission, and the like. Cell DTX may be divided into active time, in which the network transmits data, and inactive time, in which the network does not transmit data. The activation time of the Cell DTX includes a transmission duration (on-duration) from the beginning of the Cell DTX period, and may also include a portion of the extended transmission duration due to various reasons (e.g., the extended transmission duration for transmitting a response to the UE due to the reception of uplink data from the UE). The inactive time of Cell DTX may be other times of the Cell DTX period excluding the active time of Cell DTX.

During the activation time of Cell DTX, the UE needs to monitor the PDCCH to acquire downlink allocations and/or uplink grants for new transmissions and receive downlink data, i.e. the UE's monitoring and reception behavior for the downlink is not affected. While during the inactivity time of Cell DTX, the UE typically does not need to monitor the PDCCH to acquire downlink allocations and/or uplink grants for new transmissions, but the UE still needs to monitor paging and acquire system messages. Generally, during the inactive time of Cell DTX, the uplink transmission of the UE is not affected.

Cell DRX

To save power consumption of the network, the network may receive discontinuously. The network may configure the UE with Cell DRX so that the UE knows how the network is discontinuous to receive within a certain Cell. After the network configures the Cell DRX for the UE, the Cell DRX may be activated by default, or the Cell DRX may be activated and/or deactivated by indicating after configuration. The Cell DRX configuration may include information such as a discontinuous reception cycle, a duration of starting reception, an offset of starting reception, and the like. The Cell DRX may be divided into an active time in which the network receives data and an inactive time in which the network does not receive data. The activation time of the Cell DRX includes a reception duration (on-duration) of the beginning of the Cell DRX cycle, and may also include a portion of the extended reception duration due to various reasons (e.g., the extended reception duration for receiving the response of the UE due to the transmission of downlink new data). The inactivity time of the Cell DRX may be other times of the Cell DRX cycle excluding the activation time of the Cell DRX.

And in the activation time of the Cell DRX, the UE normally performs uplink transmission. During the inactive time of the Cell DRX, the UE normally performs the random access procedure, but if the SR is triggered, the SR may be pending (pending) until the end of the inactive time of the Cell DRX (i.e., the active time of the Cell DRX is entered), which means that the SR is not transmitted if the SR transmission timing and the inactive time of the Cell DRX overlap. The UE downlink listening or reception is not affected, typically during the inactive time of Cell DRX. During the inactive time of Cell DRX, the UE does not transmit/send data on the configured grant (configured grant).

The network may send the Cell DTX/DRX configuration through RRC signaling, and the UE may consider the Cell DTX/DRX function to be activated after receiving the RRC signaling containing the Cell DTX/DRX configuration. When the UE receives RRC signaling indicating deletion of the Cell DTX/DRX configuration, the UE may consider the Cell DTX/DRX function to be deactivated. Meanwhile, the network can also activate or deactivate the Cell DTX/DRX function through L1/L2 signaling.

When the UE changes from the source Cell to a target Cell according to a handover command or LTM CELL SWITCH command issued by the network, if the target Cell configures Cell DTX/DRX for the UE and the Cell DTX/DRX function is activated, the UE can only timely receive data of the network side and transmit the data to the network side within the activation time of the Cell DTX/DRX. If the UE does not know the configuration and activation condition of the Cell DTX/DRX of the target Cell, the UE cannot timely receive data of the network side and send the data to the network side, so that the service performance is affected. For the RACH-LESS LTM CELL SWITCH procedure, if the target Cell configures Cell DTX/DRX for the UE and the Cell DTX/DRX function is activated, the UE cannot timely transmit the first uplink data to the network during the inactive time of the Cell DTX/DRX. That is, if the UE does not know the configuration and activation of the target Cell DTX/DRX, the UE cannot access the target Cell in time to complete LTM CELL SWITCH procedures.

The present invention discusses how the UE performs handover and LTM CELL SWITCH after introducing Cell DRX/DTX. According to the invention, the influence on the switching or LTM CELL SWITCH performance of the UE due to the non-active period of the Cell DRX/DTX can be avoided, and the occurrence of switching failure or LTM CELL SWITCH failure is avoided or reduced.

Several embodiments of the present invention for the above-described problems are described in detail below.

Example 1

Optionally, in step S101, the UE receives an RRC message (e.g., an RRC reconfiguration message) sent by the network. Optionally, the RRC message may include at least one of the following first information:

-Cell DTX/DRX configuration information of the target Cell;

-an activation status indication of the target Cell DTX/DRX function (i.e. whether the target Cell current Cell DTX/DRX function is active or inactive), e.g. said indication indicating deactivation of the Cell DTX/DRX function if the value is 0, and said indication indicating activation of the Cell DTX/DRX function if the value is 1;

-T304 a first value;

-T304 second value.

Wherein, optionally, the target cell may refer to a target SpCell. Alternatively, the first information may be contained in the configuration of the SpCell.

Optionally, if the RRC message includes a cell group configuration, the UE performs the cell group configuration, if the cell group configuration includes a primary cell group configuration, the UE performs the primary cell group configuration, if the RRC message includes a secondary cell group configuration, the UE performs the secondary cell group configuration, and if the primary cell group configuration includes a configuration of a SpCell, the UE performs the configuration of the SpCell.

Alternatively, in step S102, if there is a synchronous reconfiguration in the RRC message, the UE performs a synchronous reconfiguration (i.e., handover) procedure. Optionally, during the UE performs the synchronization reconfiguration (i.e., handover), the UE starts a timer T304. Optionally, the value of the T304 timer is set to the T304 first value if at least one of the following conditions is satisfied:

-the RRC message contains Cell DTX/DRX configuration information of the target Cell (alternatively, cell DTX/DRX configuration information is to establish a Cell DTX/DRX configuration or to add/modify a Cell DTX/DRX configuration);

-the target Cell is configured with Cell DTX/DRX;

the Cell DTX/DRX functionality of the target Cell is activated.

Optionally, the value of the T304 timer is set to the T304 second value if at least one of the following conditions is satisfied:

-Cell DTX/DRX configuration information of the target Cell is not included in the RRC message;

-the RRC message contains erasure/release information of the Cell DTX/DRX configuration of the target Cell;

-the target Cell is not configured Cell DTX/DRX;

The Cell DTX/DRX functionality of the target Cell is deactivated or not activated.

Wherein, optionally, the first value of T304 and the second value of T304 are included in the synchronous reconfiguration, and optionally, the first value of T304 is greater than the second value of T304.

Optionally, the "the RRC message includes the SpCell configuration with the synchronization reconfiguration" may also mean that the RRC message includes the SpCell configuration with the synchronization reconfiguration, or that the cell group configuration included in the RRC message includes the SpCell configuration with the synchronization reconfiguration.

Optionally, in step S103, the UE listens to and receives Cell DTX/DRX activation/deactivation indication information in the target Cell, which may be included in a MAC CE or physical layer indication (e.g., DCI).

Alternatively, in the case that the Cell DTX/DRX activation/deactivation indication information received by the UE indicates activation/deactivation of the Cell DTX/DRX of the target Cell, the UE considers that the Cell DTX/DRX function of the target Cell is activated/deactivated. Optionally, the indication information indicates that the Cell DTX/DRX activation mode, for example, the MAC CE or the physical layer indication, includes an indication of the Cell DTX/DRX of the activation target Cell, and/or the indication of the Cell DTX/DRX of the activation target Cell is set to a specific value, for example, 1, the indication information indicates that the Cell DTX/DRX deactivation mode, for example, the MAC CE or the physical layer indication, includes an indication of the Cell DTX/DRX of the deactivation target Cell, and/or the indication of the Cell DTX/DRX of the deactivation target Cell is set to another specific value, for example, 0.

Optionally, the UE determines at least one of the following conditions:

-T304 timer is running;

-setting the value of the T304 timer to the T304 second value in step S102;

The Cell DTX/DRX activation/deactivation indication information indicates that the Cell DTX/DRX function of the target Cell is activated (alternatively this condition may also be judged before the first two conditions).

In case the UE satisfies at least one of the above conditions, the UE performs at least one of the following operations:

restarting the T304 timer (optionally, the value of the T304 timer is set to the T304 first value or the T304 second value);

-extending the duration of the running T304 timer.

The extended duration may be configured by the network through RRC message/MAC CE/physical layer indication, or may be a fixed value specified by the protocol, or the duration of the running T304 timer may be extended to the same length as the first value of T304).

Example 2

Optionally, in step S201, the UE receives an LTM configuration sent by the network side. Alternatively, the LTM configuration may be sent to the UE via an RRC message (e.g., an RRC reconfiguration message), where the LTM configuration may include, but is not limited to, LTM candidate cell configurations. And after receiving the LTM configuration, the UE stores the received LTM candidate cell configuration. The LTM candidate cell configuration includes configurations (e.g., configurations included in the RRC reconfiguration message) corresponding to one or more candidate cells.

Optionally, the RRC message may further include at least one of the following information:

-Cell DTX/DRX configuration information of the LTM candidate Cell;

-an activation status indication of the LTM candidate Cell DTX/DRX functionality (i.e. whether the LTM candidate Cell is currently active or inactive), e.g. said indication indicating deactivation of the Cell DTX/DRX functionality if the value 0, and said indication indicating activation of the Cell DTX/DRX functionality if the value 1;

CELL SWITCH first value of timer (corresponding to LTM candidate cell);

and (corresponding to the LTM candidate cell) CELL SWITCH timer second value.

Optionally, in step S202, the UE receives LTM CELL SWITCH command sent by the network side, and performs LTM CELL SWITCH procedure. Optionally, the UE starts CELL SWITCH timer during execution LTM CELL SWITCH.

Optionally, the value of CELL SWITCH timer is set to the CELL SWITCH timer first value (of the target cell) if at least one of the following conditions is satisfied:

-the target Cell is configured with Cell DTX/DRX;

the Cell DTX/DRX functionality of the target Cell is activated.

Optionally, the value of CELL SWITCH timer is set to the CELL SWITCH timer second value (of the target cell) if at least one of the following conditions is satisfied:

-the target Cell is not configured Cell DTX/DRX;

Wherein, the LTM CELL SWITCH command includes target cell information. Optionally, the target cell information is indicated by a corresponding LTM candidate cell (configuration) identity or index value, i.e. the target cell is one of the LTM candidate cells. And the first value of CELL SWITCH timer and/or the second value of CELL SWITCH timer of the target cell, namely the first value of CELL SWITCH timer and/or the second value of CELL SWITCH timer of the LTM candidate cell (configuration) corresponding to the target cell.

The UE determines whether the target Cell is configured with Cell DTX/DRX or whether the Cell DTX/DRX function is activated/deactivated, by a first determination method. The first judgment method is determined according to whether or not a Cell DTX/DRX or a Cell DTX/DRX function is activated/deactivated by an LTM candidate Cell corresponding to the target Cell. That is, in the case where a Cell DTX/DRX configuration is included in the LTM candidate Cell (configuration) corresponding to the target Cell (alternatively, cell DTX/DRX configuration information is Cell DTX/DRX configuration is established or Cell DTX/DRX configuration is increased/modified), the target Cell is considered to be configured with Cell DTX/DRX, while alternatively, cell DTX/DRX function of the target Cell is considered to be activated, and in the case where a Cell DTX/DRX configuration is not included in the LTM candidate Cell (configuration) corresponding to the target Cell (or Cell DTX/DRX configuration is deleted/released is included in the LTM candidate Cell (configuration) corresponding to the target Cell), the target Cell is considered to be not configured with Cell DTX/DRX, while alternatively, cell DTX function of the target Cell is considered to be deactivated or not activated. Or alternatively, when the Cell DTX/DRX function of the LTM candidate Cell (configured) corresponding to the target Cell is activated, the Cell DTX/DRX function of the target Cell is considered to be activated, and when the Cell DTX/DRX function of the LTM candidate Cell (configured) corresponding to the target Cell is deactivated or not activated, the Cell DTX/DRX function of the target Cell is considered to be deactivated or not activated.

Wherein, optionally, the first value of CELL SWITCH timer and the second value of CELL SWITCH timer are included in the LTM candidate cell configuration of the LTM configuration, and the first value of CELL SWITCH timer may be greater than the second value of CELL SWITCH timer.

Optionally, in step S203, the UE listens to and receives Cell DTX/DRX activation/deactivation indication information in the target Cell, which may be included in a MAC CE or physical layer indication (e.g., DCI). Step S203 differs from step S103 in that, optionally, the UE judges at least one of the following conditions:

-CELL SWITCH the timer is running;

-setting the value of CELL SWITCH timer to CELL SWITCH timer second value in step S202;

The Cell DTX/DRX activation/deactivation indication information indicates that the Cell DTX/DRX function of the target Cell is activated (this condition may also be judged before the first two conditions).

Restarting CELL SWITCH the timer (optionally, the value of CELL SWITCH is set to CELL SWITCH first value or CELL SWITCH second value);

Extending the duration of the running CELL SWITCH timer (the extended duration may be configured by the network side through RRC message/MAC CE/physical layer indication, or may be some fixed value specified by the protocol, or extending the duration of the running CELL SWITCH timer to the same length as the first value of CELL SWITCH).

The other processing of step S203 is the same as that of step S103.

Example 3

According to embodiment 2, the present embodiment includes step S301 and step S302.

Optionally, in step S301, the UE receives the LTM configuration sent by the network side. Alternatively, step S301 is the same as step S201.

Optionally, in step S302, the UE receives LTM CELL SWITCH command sent by the network side, and performs LTM CELL SWITCH procedure. Optionally, at least one of the following information may be included in the LTM CELL SWITCH command sent by the network side and received by the UE:

-Cell DTX/DRX configuration information of the target Cell;

-CELL SWITCH a timer first value;

-CELL SWITCH a timer second value.

Optionally, the UE starts CELL SWITCH timer during execution LTM CELL SWITCH.

-the target Cell is configured with Cell DTX/DRX;

the Cell DTX/DRX functionality of the target Cell is activated.

-the target Cell is not configured Cell DTX/DRX;

Wherein, the LTM CELL SWITCH command includes target cell information. Optionally, the target cell information is indicated by a corresponding candidate cell (configuration) identity or index value, i.e. the target cell is one of the LTM candidate cells.

The main difference from step S202 is that in step S202, it is determined whether the target Cell configures Cell DTX/DRX and whether the Cell DTX/DRX function of the target Cell is activated, which is determined according to the stored Cell DTX/DRX configuration information of the LTM candidate Cell (configuration) according to the LTM candidate Cell (configuration) corresponding to the target Cell, and in step S302, the Cell DTX/DRX configuration of the target Cell and the Cell DTX/DRX function activation state of the target Cell are directly transmitted to the UE in the LTM CELL SWITCH command, so that the UE can directly determine the Cell DTX/DRX configuration of the target Cell and the Cell DTX/DRX function activation state of the target Cell.

For example, by a second determination method that, in the case where the LTM CELL SWITCH command contains the Cell DTX/DRX configuration of the target Cell (alternatively, cell DTX/DRX configuration information is to establish the Cell DTX/DRX configuration or to add/modify the Cell DTX/DRX configuration), the target Cell is considered to be configured with Cell DTX/DRX while, alternatively, the Cell DTX/DRX function of the target Cell is considered to be activated, and in the case where the LTM CELL SWITCH command does not contain the Cell DTX/DRX configuration (or the LTM CELL SWITCH command contains to delete/release the Cell DTX/DRX configuration), the target Cell is considered to be not configured with Cell DTX/DRX while, alternatively, the Cell DTX/DRX function of the target Cell is considered to be deactivated or not activated. Or alternatively, if the LTM CELL SWITCH command indicates that the Cell DTX/DRX function of the target Cell is activated, then the Cell DTX/DRX function of the target Cell is considered to be activated, and if the LTM CELL SWITCH command indicates that the Cell DTX/DRX function of the target Cell is deactivated or not activated, then the Cell DTX/DRX function of the target Cell is considered to be deactivated or not activated.

Optionally, in step S303, the UE listens to and receives Cell DTX/DRX activation/deactivation indication information in the target Cell, which may be included in a MAC CE or physical layer indication (e.g., DCI). Alternatively, step S303 is the same as step S203.

Example 4

According to embodiment 2 and embodiment 3, the present embodiment includes step S401 and step S402.

Optionally, in step S401, the UE receives the LTM configuration sent by the network side. Alternatively, step S401 is the same as step S201.

Optionally, in step S402, the UE receives LTM CELL SWITCH command sent by the network side, and performs LTM CELL SWITCH procedure. The LTM CELL SWITCH command sent by the network side and received by the UE may include at least one of the following information:

-Cell DTX/DRX configuration information of the target Cell;

-CELL SWITCH a timer first value;

-CELL SWITCH timer second value;

-a value of a Time Advance (TA) of the target cell.

Optionally, in performing LTM CELL SWITCH procedure, the UE initiates RACH-LESS LTM CELL SWITCH procedure if at least one of the following conditions is met:

-the target Cell is configured with Cell DTX/DRX;

-the Cell DTX/DRX functionality of the target Cell is activated;

-LTM CELL SWITCH the command contains the value of the Time Advance (TA) of the target cell and the value of the Time Advance (TA) of the target cell is a valid value.

Optionally, in the process of executing LTM CELL SWITCH by the UE, the UE initiates a random access procedure to the target cell if at least one of the following conditions is satisfied:

-the target Cell is not configured Cell DTX/DRX;

-the Cell DTX/DRX functionality of the target Cell is deactivated or not activated;

-LTM CELL SWITCH the value of the Time Advance (TA) of the target cell contained in the command is an invalid value.

Wherein, optionally, the UE determines whether the target Cell is configured with Cell DTX/DRX and whether the Cell DTX/DRX function of the target Cell is activated may be according to the first determination method described in step S202 or according to the second determination method described in step S302.

Optionally, in step S403, the UE listens to and receives Cell DTX/DRX activation/deactivation indication information in the target Cell, which may be included in a MAC CE or physical layer indication (e.g., DCI).

Optionally, the UE determines at least one of the following conditions (optionally, the order of the conditions may be reversed):

-CELL SWITCH the timer is running;

The UE is conducting RACH-LESS LTM CELL SWITCH procedure (i.e. RACH-LESS CELL SWITCH procedure has been initiated and has not completed successfully or has not failed);

-the Cell DTX/DRX activation/deactivation indication information indicates that a Cell DTX/DRX function of a target Cell is activated.

-stopping RACH-LESS LTM CELL SWITCH procedure;

-initiating a random access procedure at a target cell;

restart CELL SWITCH the timer (alternatively, the value of CELL SWITCH timer may be CELL SWITCH timer first value or CELL SWITCH timer second value for LTM CELL SWITCH procedure requiring initiation of random access).

Alternatively, the CELL SWITCH timer first value and the CELL SWITCH timer second value in this embodiment may both be for RACH-LESS LTM CELL SWITCH procedure.

Example 5

According to embodiment 4, during the UE initiated RACH-LESS LTM CELL SWITCH (or expressed as being in operation at CELL SWITCH timer), the UE may send the first uplink data to the target Cell through the configured uplink grant sent by the network, regardless of whether the UE is in the inactive time of the Cell DRX of the target Cell (in case the Cell DRX of the target Cell is configured, optionally and the Cell DRX function of the target Cell is activated). During the UE initiated RACH-LESS LTM CELL SWITCH (or expressed as when CELL SWITCH timer is running), the UE may send the first uplink data to the target Cell by listening to the PDCCH at the target Cell for a dynamic uplink grant, regardless of whether the UE is in the inactive time of the Cell DTX of the target Cell (in the case that the Cell DTX of the target Cell is configured, optionally and in the case that the Cell DTX functionality of the target Cell is activated).

Another expression of this embodiment may be that the UE does not monitor the PDCCH for new data (i.e. does not monitor the PDCCH if the retransmission timer is not activated) during the inactivity time of the Cell DRX of the target Cell (in case the Cell DRX of the target Cell is configured, optionally and in case the Cell DRX function of the target Cell is activated), except that the UE acquires the uplink grant due to the fact that the UE monitors the PDCCH is in the course of RACH-LESS LTM CELL SWITCH (or expressed as transmitting the first uplink data to the target Cell when the CELL SWITCH timer is running) during RACH-LESS LTM CELL SWITCH (or expressed as transmitting the first uplink data to the target Cell when the CELL SWITCH timer is running) during the inactivity time of the Cell DTX of the target Cell (in case the Cell DTX of the target Cell is configured, optionally and in case the Cell DTX function of the target Cell is activated).

The embodiments of the present invention are specifically described above, and the user equipment of the present invention is described below.

Fig. 6 is a schematic block diagram of a user equipment UE according to the present invention. As shown in fig. 6, the user equipment UE600 comprises a processor 601 and a memory 602. The processor 601 may include, for example, a microprocessor, microcontroller, embedded processor, or the like. The memory 602 may include, for example, volatile memory (such as random access memory RAM), a Hard Disk Drive (HDD), non-volatile memory (such as flash memory), or other memory. The memory 602 has stored thereon program instructions. Which, when executed by the processor 601, may perform the above-described method performed by the user equipment as described in detail herein.

The method of the present disclosure and the apparatus involved have been described above in connection with the preferred embodiments. It will be appreciated by those skilled in the art that the methods shown above are merely exemplary and that the embodiments described above can be combined with one another without contradiction. The method of the present invention is not limited to the steps and sequences shown above.

The user equipment shown above may comprise further modules, e.g. modules that may be developed or developed in the future, available for a base station, MME, or UE, etc. The various identifiers shown above are merely exemplary and are not limiting, and the present disclosure is not limited to specific cells as examples of such identifiers. Many variations and modifications may be made by one of ordinary skill in the art in light of the teachings of the illustrated embodiments.

It should be understood that the above-described embodiments of the present disclosure may be implemented by software, hardware, or a combination of both software and hardware. For example, the various components within the base station and user equipment in the above embodiments may be implemented by a variety of devices including, but not limited to, analog circuit devices, digital Signal Processing (DSP) circuits, programmable processors, application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs), programmable logic devices (CPLDs), and the like.

The program running on the apparatus according to the present invention may be a program for causing a computer to realize the functions of the embodiments of the present invention by controlling a Central Processing Unit (CPU). The program or information processed by the program may be temporarily stored in a volatile store such as a random access memory RAM, a Hard Disk Drive (HDD), a nonvolatile store such as a flash memory, or other memory system.

A program for realizing the functions of the embodiments of the present invention may 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 term "computer system" as used herein may be a computer system embedded in the device and may include an operating system or hardware (e.g., peripheral devices). The "computer-readable recording medium" may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium in which a program is stored dynamically at a short time, or any other recording medium readable by a computer.

The various features or functional modules of the apparatus used in the embodiments described above may be implemented or performed by circuitry (e.g., single-chip or multi-chip integrated circuits). Circuits designed to perform the functions described herein may include a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The circuit may be a digital circuit or an analog circuit. Where new integrated circuit technologies are presented as an alternative to existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present invention may also be implemented using these new integrated circuit technologies.

Furthermore, the present invention is not limited to the above-described embodiments. Although various examples of the embodiments have been described, the present invention is not limited thereto. Fixed or non-mobile electronic devices installed indoors or outdoors may be used as terminal devices or communication devices such as AV devices, kitchen devices, cleaning devices, air conditioners, office devices, vending machines, and other home appliances, etc.

As above, the embodiments of the present invention have been described in detail with reference to the accompanying drawings. The specific structure is not limited to the above-described embodiment, but the present invention also includes any design modification without departing from the gist of the present invention. In addition, various modifications can be made to the present invention within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the different embodiments are also included in the technical scope of the present invention. Further, the components having the same effects described in the above embodiments may be replaced with each other.

Claims

1. A method performed by a user equipment, comprising the steps of:

The user equipment receives RRC message sent by the network;

In case of synchronous reconfiguration in the RRC message, the user equipment performs a synchronous reconfiguration procedure, and

The user equipment listens to and receives Cell DTX/DRX activation/deactivation indication information in a target Cell,

The RRC message includes at least one of the following first information:

CellDTX/DRX configuration information of the target cell;

an activation status indication of the target cell CellDTX/DRX function;

T304 first value, and

T304 second value.

2. The method performed by a user equipment according to claim 1, wherein,

In the process that the user equipment executes synchronous reconfiguration, the user equipment starts a timer T304, and the value of the T304 timer is set to be the first value of T304 under the condition that at least one of the following conditions is met:

the RRC message comprises CellDTX/DRX configuration information of the target cell;

The target cell is configured with CellDTX/DRX, and

The CellDTX/DRX function of the target cell is activated,

The value of the T304 timer is set to a T304 second value in the case that at least one of the following conditions is satisfied:

the RRC message does not contain CellDTX/DRX configuration information of the target cell;

the RRC message comprises the deleting/releasing information of CellDTX/DRX configuration of the target cell;

The target cell is not configured CellDTX/DRX, and

The CellDTX/DRX function of the target cell is deactivated or not activated.

3. The method performed by the user equipment of claim 2, wherein,

The user equipment judges at least one of the following conditions:

the T304 timer is running;

Setting the value of the T304 timer as the second value of T304 in the process of synchronous reconfiguration of the user equipment

The Cell DTX/DRX activation/deactivation indication information indicates that a Cell DTX/DRX function of the target Cell is activated,

In the case that the user equipment determines that at least one of the above conditions is satisfied, the user equipment performs at least one of the following operations:

restarting the T304 timer, and

Extending the duration of the running T304 timer.

4. A method performed by a user equipment, comprising the steps of:

the user equipment receives LTM configuration sent by a network side;

The user equipment receives LTM CELL SWITCH command sent by the network side, executes LTM CELL SWITCH process, and

In the case that the LTM configuration is sent to the ue through an RRC message, the RRC message includes at least one of the following information:

CellDTX/DRX configuration information of the LTM candidate cell;

an activation status indication of the LTM candidate cell CellDTX/DRX function;

CELL SWITCH first timer value corresponding to LTM candidate cell, and

And CELL SWITCH, a second value of the timer corresponding to the LTM candidate cell.

5. The method performed by the user equipment of claim 4, wherein,

The LTM CELL SWITCH command sent by the network side and received by the user equipment includes at least one of the following information:

CellDTX/DRX configuration information of the target cell;

an activation status indication of the target cell CellDTX/DRX function;

CELL SWITCH a first value of the timer;

CELL SWITCH second value of timer, and

And the time advance TA value of the target cell.

6. The method performed by a user equipment according to claim 4 or 5, wherein,

In the process of executing LTM CELL SWITCH by the user equipment, the user equipment starts CELL SWITCH a timer, and the value of the CELL SWITCH timer is set to be the first value of the CELL SWITCH timer of the target cell if at least one of the following conditions is satisfied:

The target cell is configured with CellDTX/DRX, and

The CellDTX/DRX function of the target cell is activated,

The CELL SWITCH timer value is set to the CELL SWITCH timer second value of the target cell if at least one of the following conditions is satisfied:

The target cell is not configured CellDTX/DRX, and

The CellDTX/DRX function of the target cell is deactivated or not activated.

7. The method performed by the user equipment of claim 6, wherein,

The user equipment judges at least one of the following conditions:

The CELL SWITCH timer is running;

Setting the value of CELL SWITCH timer to CELL SWITCH timer second value in LTM CELL SWITCH executing process by the user equipment, and

Restarting said CELL SWITCH timer, and

And prolonging the duration of the CELL SWITCH running timer.

8. The method performed by a user equipment according to claim 4 or 5, wherein,

In the user equipment performing LTM CELL SWITCH procedure, the user equipment initiates a RACH-LESS LTM CELL SWITCH procedure if at least one of the following conditions is met:

the target cell is configured with CellDTX/DRX;

the CellDTX/DRX function of the target cell is activated, and

The LTM CELL SWITCH command includes a value of the time advance TA of the target cell and the value of the time advance TA of the target cell is a valid value,

In the process of executing LTM CELL SWITCH by the user equipment, the user equipment initiates a random access procedure to the target cell under the condition that at least one of the following conditions is met:

the target cell is not configured CellDTX/DRX;

The CellDTX/DRX function of the target cell is deactivated or not activated, and

The value of the time advance TA of the target cell contained in the LTM CELL SWITCH command is an invalid value.

9. The method performed by the user equipment of claim 8, wherein,

The user equipment judges at least one of the following conditions:

The CELL SWITCH timer is running;

The user equipment is conducting RACH-LESS LTM CELL SWITCH procedure, and

Stopping the RACH-LESS LTM CELL SWITCH flow;

Initiating a random access procedure in the target cell, and

And restarting the CELL SWITCH timer.

10. A user equipment, comprising:

Processor, and

A memory storing instructions;

Wherein the instructions, when executed by the processor, perform the method performed by the user equipment according to any of claims 1 to 9.