Method executed by user equipment and user equipment

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: the user equipment receives an RRC message sent by a network; under the condition that the RRC message carries the synchronous reconfiguration, the user equipment executes a synchronous reconfiguration process; 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 the following first information: Cell DTX / DRX configuration information of the target cell; the activation state of the DTX / DRX function of the target cell is indicated; t304 is a first value; and T304 a second value.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and more particularly to a method for cell change performed by a user equipment and a corresponding user equipment. Background Art

[0002] Network energy saving is beneficial to reducing environmental impact and saving operator costs. By lengthening the time interval for the base station to continuously receive and send data and shutting down the transmission and reception of some symbols, the base station can be put into a sleep state, or the cell where it is located can be put into a network energy saving mode, thereby reducing the power consumption of the base station and achieving network energy saving. For the above reasons, in December 2022, at the 3rd Generation Partnership Project (3GPP) RAN#98e plenary meeting, the NR network energy saving work project for version 18 (see non-patent document: RP-223540 New WID: Network energy savings for NR) was approved. One of the goals of this work project is to enhance cell DRX and cell DTX in the RRC connected state, that is, network discontinuous reception and network discontinuous transmission, so as to achieve network energy saving.

[0003] The introduction of Layer 1 and Layer 2 triggered mobility (LTM) mechanism is being discussed in the NR system of version 18. The purpose of this mechanism is to reduce mobility latency. In NR systems before version 18, mobility is mainly achieved through handover (also known as synchronous reconfiguration) triggered by RRC layer signaling based on layer 3 measurement results. During the handover process, the user equipment UE (hereinafter referred to as "UE") releases the source service cell, then adds the target service cell, and needs to perform a complete layer 2 and layer 1 reset operation. This results in longer latency, higher overhead, and longer data interruption time in the mobility process. In the LTM mechanism, the RRC configuration of the target candidate cell is sent to the UE in advance, and the subsequent cell change is triggered through layer 1 / layer 2 signaling based on the layer 1 measurement results, thereby achieving the purpose of reducing latency, overhead, and interruption time.

[0004] The present invention discusses how UE performs handover and how to perform cell switch after introducing cell DRX and / or cell DTX. Through the present invention, the influence on the performance of UE handover or cell switch caused by the inactive period of Cell DRX / DTX can be avoided. Summary of the invention

[0005] The present invention provides a method executed by a user equipment, which is used to solve the problem of how the UE performs handover and how to perform cell switch after introducing cell DRX and / or cell DTX.

[0006] According to one aspect of the present invention, a method performed by a user equipment is provided, comprising the following steps: the user equipment receives an RRC message sent by a network; when the RRC message carries a synchronous reconfiguration, the user equipment performs a synchronous reconfiguration process; and the user equipment monitors and receives Cell DTX / DRX activation / deactivation indication information in a target cell, the RRC message comprising at least one of the following first information: Cell DTX / DRX configuration information of the target cell; activation status indication of the Cell DTX / DRX function of the target cell; a first value of T304; and a second value of T304.

[0007] In the above-mentioned method executed by the user equipment, it is preferred that, during the process of the user equipment executing synchronous reconfiguration, the user equipment starts timer T304, and when at least one of the following conditions is met, the value of the T304 timer is set to the first value of T304: the RRC message contains the Cell DTX / DRX configuration information of the target cell; the target cell is configured with Cell DTX / DRX; and the Cell DTX / DRX function of the target cell is activated, and when at least one of the following conditions is met, the value of the T304 timer is set to the second value of T304: the RRC message does not contain the Cell DTX / DRX configuration information of the target cell; the RRC message contains deletion / release information of the Cell DTX / DRX configuration of the target cell; the target cell is not configured with Cell DTX / DRX; and the Cell DTX / DRX function of the target cell is deactivated or not activated.

[0008] In the above-mentioned method executed by the user equipment, it is preferred that the user equipment determines at least one of the following conditions: the T304 timer is running; the value of the T304 timer is set to the second value of T304 during the synchronization reconfiguration process 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. When the user equipment determines that at least one of the above conditions is met, the user equipment performs at least one of the following operations: restarting the T304 timer; and extending the duration of the running T304 timer.

[0009] According to one aspect of the present invention, a method performed by a user equipment is provided, comprising the following steps: the user equipment receives an LTM configuration sent by a network side; the user equipment receives an LTM cell switch command sent by the network side, and executes an LTM cell switch process; and the user equipment monitors and receives Cell DTX / DRX activation / deactivation indication information in a target cell, and in a case where the LTM configuration is sent to the user equipment via an RRC message, the RRC message includes at least one of the following information: Cell DTX / DRX configuration information of an LTM candidate cell; an activation status indication of a Cell DTX / DRX function of an LTM candidate cell; a first value of a cell switch timer corresponding to the LTM candidate cell; and a second value of a cell switch timer corresponding to the LTM candidate cell.

[0010] In the above-mentioned method executed by the user equipment, it is preferred that the LTM cell switch command sent by the network side and received by the user equipment contains at least one of the following information: Cell DTX / DRX configuration information of the target cell; activation status indication of the Cell DTX / DRX function of the target cell; a first value of the cell switch timer; a second value of the cell switch timer; and a value of the timing advance TA of the target cell.

[0011] In the above-mentioned method performed by the user equipment, it is preferred that, during the process of the user equipment executing LTM cellswitch, the user equipment starts a cell switch timer, and when at least one of the following conditions is met, the value of the cell switch timer is set to the first value of the cell switch timer of the target cell: the target cell is configured with Cell DTX / DRX; and the Cell DTX / DRX function of the target cell is activated, and when at least one of the following conditions is met, the value of the cell switch timer is set to the second value of the cell switch timer of the target cell: the target cell is not configured with Cell DTX / DRX; and the Cell DTX / DRX function of the target cell is deactivated or not activated.

[0012] In the above-mentioned method executed by the user equipment, it is preferred that the user equipment determines at least one of the following conditions: the cell switch timer is running; the value of the cell switch timer is set to the second value of the cell switch timer during the LTM cell switch execution of the user equipment; and the CellDTX / DRX activation / deactivation indication information indicates that the Cell DTX / DRX function of the target cell is activated. When the user equipment determines that at least one of the above conditions is met, the user equipment performs at least one of the following operations: restarting the cell switch timer; and extending the duration of the running cell switch timer.

[0013] In the above-mentioned method performed by the user equipment, it is preferred that, during the LTM cellswitch process performed by the user equipment, when at least one of the following conditions is met, the user equipment initiates a RACH-less LTM cell switch process: the target cell is configured with Cell DTX / DRX; the Cell DTX / DRX function of the target cell is activated; and the LTM cell switch command contains a value of the timing advance TA of the target cell and the value of the timing advance TA of the target cell is a valid value, and during the LTM cell switch process performed by the user equipment, when at least one of the following conditions is met, the user equipment initiates a random access process to the target cell: the target cell is not configured with Cell DTX / DRX; the Cell DTX / DRX function of the target cell is deactivated or not activated; and the value of the timing advance TA of the target cell contained in the LTM cell switch command is an invalid value.

[0014] In the above method performed by the user equipment, it is preferred that the user equipment determines at least one of the following conditions: the cell switch timer is running; the user equipment is performing a RACH-less LTM cellswitch process; and the Cell DTX / DRX activation / deactivation indication information indicates that the CellDTX / DRX function of the target cell is activated. When the user equipment determines that at least one of the above conditions is met, the user equipment performs at least one of the following operations: stopping the RACH-less LTM cell switch process; initiating a random access process in the target cell; and restarting the cell switch timer.

[0015] According to another aspect of the present invention, a user equipment is provided, comprising: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, execute the method performed by the user equipment according to any of the above aspects.

[0016] According to the method executed by the user equipment and the user equipment of the present invention, the influence on the switching of UE or the performance of cell switch due to the inactive period of Cell DRX / DTX can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0018] Figure 1 It is a flowchart showing how a UE in an RRC connected state changes a serving cell through a handover process.

[0019] Figure 2 It is a flowchart showing the method executed by the user equipment involved in the first embodiment of the present invention.

[0020] Figure 3 It is a flowchart showing the method executed by the user equipment involved in the second embodiment of the present invention.

[0021] Figure 4 It is a flowchart showing the method executed by the user equipment involved in the third embodiment of the present invention.

[0022] Figure 5 It is a flowchart showing the method executed by the user equipment involved in the fourth embodiment of the present invention.

[0023] Figure 6 The figure is a simplified structural block diagram of a user equipment UE involved in the present invention. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the present invention should not be limited to the specific embodiments described below. In addition, for the sake of simplicity, detailed descriptions of known technologies that are not directly related to the present invention are omitted to prevent confusion in understanding the present invention.

[0025] The following describes some of the terms involved in the present invention. The specific meanings of the terms can be found in the latest 3GPP standard specifications.

[0026] UE:User Equipment

[0027] NR: New Radio, a new generation of wireless technology

[0028] MAC: Medium Access Control

[0029] MAC CE: MAC control element

[0030] RRC: Radio Resource Control

[0031] RRC_CONNECTED: RRC connected state

[0032] RRC_INACTIVE: RRC inactive state

[0033] RRC_IDLE: RRC idle state

[0034] RAN: Radio Access Network, wireless access layer

[0035] PDCCH: Physical downlink control channel, physical downlink control channel

[0036] PUCCH: Physical Uplink Control Channel, physical uplink control channel

[0037] PUSCH: Physical Uplink Shared Channel, physical uplink shared channel

[0038] PBCH: Physical broadcast channel

[0039] SFN:System Frame Number

[0040] PDU: Protocol Data Unit

[0041] SSB: SS / PBCH block, synchronization signal / physical broadcast channel block

[0042] DCI: Downlink Control Information

[0043] C-RNTI: Cell Radio Network Temporary Identifier

[0044] RSRP: Reference Signal Received Power

[0045] RSRQ: Reference Signal Received Quality

[0046] SpCell: Special Cell, including PCell and PSCell

[0047] DC: Dual Connectivity

[0048] MCG: Master Cell Group

[0049] SCG: Secondary Cell Group

[0050] PCell: Primary Cell

[0051] PSCell: Primary SCG Cell

[0052] MIB: Master Information Block, main message block

[0053] DRX: Discontinuous Reception

[0054] DTX: Discontinuous Transmission

[0055] SIB: System Information Block, system message block

[0056] NES: network energy saving

[0057] gNB: the next Generation Node B

[0058] RLF: Radio Link Failure, radio link failure

[0059] SN: Sequence Number

[0060] CN: Core Network

[0061] SR: Scheduling Request

[0062] UL-SCH: Uplink Shared Channel, uplink shared channel

[0063] BWP: Bandwidth Part, bandwidth part

[0064] CSI: Channel State Information

[0065] SRS: Sounding Reference Signal, channel detection reference signal

[0066] LTM: L1 / L2 Triggered Mobility

[0067] L1: Layer 1

[0068] L2: Layer 2

[0069] TA: Timing Advance

[0070] RACH: Random Access Channel

[0071] PRACH: Physical Random Access Channel, physical random access channel

[0072] In the present invention, network (network or NW), base station (base station or gNB or eNB) and RAN can be used interchangeably, and the network can be a long-term evolution LTE network, a new radio access technology (New RAT, NR) network, an enhanced long-term evolution eLTE network, or other networks defined in subsequent evolution versions of 3GPP. The base station in the present invention can be any type of base station, including Node B, enhanced base station eNB, 5G communication system base station gNB; or micro base station, micro-micro base station, macro base station, home base station, etc.; the network generally refers to a base station or a cell. The cell can also be a cell under any type of base station mentioned above. If there is no special explanation, the cell, beam, and transmission point (Transmission Point, TRP) can be interchangeable, and the base station can also be a central unit (gNB-Central Unit, gNB-CU) or a distributed unit (gNB-Distributed Unit, gNB-DU) constituting the base station.

[0073] In the present invention, the user equipment UE may refer to a device supporting network energy saving, a device supporting Cell DRX and / or Cell DTX, a device supporting LTM, a device supporting RACH-less LTM cell switch, or other types of NR devices or LTE devices.

[0074] In the present invention, "feedback", "submit", "report", "send", "transmit or transport", "inform", "indicate", "provide" can be used interchangeably. "Use", "make available", "apply", "implement", "enable", "activate", "perform", "do" and the like can be used interchangeably.

[0075] In the present invention, "associate", "correspond" and "map" can be used interchangeably.

[0076] In the present invention, configure and reconfigure can be used interchangeably. Receive, detect, monitor and decode can be used interchangeably.

[0077] In the present invention, activation period and activation time can be used interchangeably, deactivation period and deactivation time can be used interchangeably, "non-active or deactive" and "sleep" can be used interchangeably. In the present invention, "time" can be a time point, duration, period, etc.

[0078] In the present invention, "Cell DTX / DRX" refers to "Cell DTX and / or Cell DRX". In the present invention, "LTM cellswitch" refers to a cell switch based on the LTM mechanism, which may include an LTM cell switch that needs to initiate a random access procedure to a target cell, and may also refer to a RACH-less LTM cellswitch that does not need to initiate a random access procedure to a target cell.

[0079] In the present invention, "handover" and "reconfiguration with sync" may be used interchangeably.

[0080] In the present invention, "LTM candidate cell" may refer to "LTM target candidate cell", that is, the target cell to which the LTM cell switch is switched may be one of the LTM candidate cells.

[0081] It should be noted that, in this specification, two things connected by "and", "or", or "and / or" may represent different ways of expressing the same meaning in different application scenarios. There may be a relationship of inclusion and being included between the two, and they do not necessarily refer to completely different contents.

[0082] Hereinafter, a description is given of related art of the present invention.

[0083] Handover

[0084] When a UE in an RRC connected state moves from the coverage area of ​​one cell to the coverage area of ​​another cell, in order to ensure service continuity, the base station or the network side usually instructs the UE to perform a handover operation.

[0085] Handover refers to the change of the primary cell initiated by the network side, including the change of the primary cell between cells and the change of the primary cell within the cell, that is, the primary cell of the UE is changed from the source cell to the target cell, where the source cell and the target cell can be the same cell or different cells. In this process, the key or security algorithm used for access layer security can also be updated accordingly. The source cell is also called the source base station, or the source beam, the source transmission point (Transmission point, TRP), and the source master cell group (Master Cell Group, MCG). The target cell can also be called the target base station, or the target beam, the target transmission point or the target MCG. The source cell refers to the cell that serves the UE connected before the handover process is initiated, that is, the cell in which the UE receives the RRC message containing the handover command. The target cell refers to the cell that serves the UE to which the UE is connected after the handover process is successfully completed, or the cell indicated by the target cell identifier contained in the handover command, and the cell to which the UE accesses when it receives the handover execution. The handover command is used to trigger the UE to perform a handover, and in the NR system it is an RRC reconfiguration message containing a synchronous reconfiguration (Reconfiguration with sync) information element. Furthermore, for the handover of the master cell, it is an RRC reconfiguration message containing a synchronous reconfiguration (Reconfiguration with sync) information element for the master cell group (MCG). At this time, the handover can also be called the synchronous reconfiguration of the MCG. The synchronous reconfiguration information element includes the configuration information of the target cell, such as the target cell identifier, the target cell frequency, the public configuration of the target cell such as system information, the random access configuration used by the UE to access the target cell, the security parameter configuration of the UE in the target cell, and the radio bearer configuration of the UE in the target cell.

[0086] The user mobility in the connected state is mainly achieved through a handover process, and the handover refers to the process of changing the serving cell of a UE in the RRC connected state. Figure 1 The flowchart shows that a UE in RRC connected state changes the serving cell through the handover process. Figure 1 As shown in FIG. 1 , the switching process generally includes the following stages:

[0087] Phase 1: Measurement phase. The base station sends a measurement configuration to the UE; the UE measures the radio link of the serving cell or neighboring cell based on the measurement configuration, and when the configured measurement reporting conditions are met, the UE sends a measurement report to the base station.

[0088] Phase 2: Handover preparation phase. The base station decides whether to trigger a handover for the UE based on the received measurement report and other factors such as the base station load. If it is determined that a handover is triggered for the UE, the source base station initiates the handover preparation process by sending a handover request message to the target base station. The target base station decides whether to accept the handover request for the UE based on factors such as the UE context in the handover request message and the available resources of the target base station. If yes, it replies to the source base station with a handover confirmation message, which contains an inter-node RRC message, namely the handover command.

[0089] Phase 3: Handover execution phase. The source base station sends the handover command to the UE and starts forwarding the UE's data to the target base station. The UE that receives the handover command immediately applies the configuration of the handover command to perform the handover, accesses the target base station through the random access process, and sends a confirmation message to the target base station. The random access process is not mandatory.

[0090] Phase 4: Handover completion phase. After the target base station confirms that the UE has successfully accessed, it sends a handover completion message to the source base station. The source base station can release the UE context stored thereon.

[0091] The UE detects the handover process through a timer T304. When the handover process is initiated, the UE starts the T304 timer; when the handover process is completed, the UE stops the timer T304; when T304 times out, the UE considers that the handover has failed.

[0092] The handover command described in stage 3 is layer 3 signaling, ie, an RRC message.

[0093] LTM

[0094] LTM means that the UE triggers a mobility operation upon receiving L1 / L2 signaling (such as MAC CE), that is, triggers a cell change. The cell change using the LTM mechanism can be called LTM cell switch to distinguish it from handover.

[0095] The network side sends the LTM configuration to the UE through RRC signaling (such as RRC reconfiguration message), where the LTM configuration may include but is not limited to: LTM candidate cell configuration. After receiving the LTM configuration, the UE saves the received LTM candidate cell configuration. The LTM candidate cell configuration includes configurations corresponding to one or more candidate cells (for example, various configurations contained in the RRC reconfiguration message). Based on the layer 1 measurement results reported by the UE, the network determines the target cell for the final execution of the LTM cell switch, and triggers the LTM cell switch process through L1 / L2 signaling. The L1 / L2 signaling used to trigger the cell switch process contains at least information about the target cell (for example, the identifier or index value of the candidate cell (configuration) corresponding to the target cell). The UE triggers the LTM cell switch process and applies the saved previously received LTM candidate cell configuration to execute the LTM cell switch process to the target cell.

[0096] The L1 / L2 signaling for triggering the cell switch may be referred to as an LTM cell switch command, and in the present invention, these two terms may be used interchangeably. The L1 / L2 signaling for triggering the LTM cell switch may be a MACCE or a physical layer indication.

[0097] The source cell refers to the cell serving the UE to which the UE is connected before the LTM cell switch process is initiated, that is, the cell from which the UE receives the LTM cell switch command. The target cell refers to the cell serving the UE to which the UE is connected after the LTM cell switch process is successfully completed, or the target cell included in the LTM cell switch command, and / or the cell to which the UE accesses when it receives the L1 / L2 signaling for executing the LTM cell switch. That is, after receiving the LTM cell switch command, the UE will switch from the source cell to the target cell, and the target cell will continue to provide services for the UE. The candidate cell is a candidate cell that can be used as a target cell for the LTM cell switch.

[0098] In the LTM mechanism, the configuration of the candidate cell is sent to the UE in advance, and the LTM cell switch is subsequently triggered through L1 / L2 signaling based on the L1 measurement results, thereby reducing the delay of cell change, signaling overhead and service interruption time.

[0099] RACH-less LTM

[0100] In the random access procedure, the UE will send a random access preamble on the transport channel RACH. This operation can also be considered as PRACH transmission, where PRACH is the physical layer random access channel and its corresponding transport layer channel is RACH. The sent random access preamble will be received by the network side. Since the network side can control the coverage of one or more cells, such PRACH transmission is performed on one of the cells under the control of the network side.

[0101] In the LTM mechanism, in order to further reduce the delay of the cell change process, the network side can obtain the uplink timing advance (TA) of the candidate cell in advance before triggering the cell change, so that when the UE subsequently performs the LTM cell switch process to the target cell, the random access process to the target cell can be omitted, and the acquired uplink TA value can be directly used for uplink transmission. The network side can configure dedicated random access resources to the UE through a physical downlink control channel order (PDCCH order) to trigger a random access process to a candidate cell. In the corresponding random access process, the UE sends a random access preamble sequence to the candidate cell. The network side receives the random access preamble sequence sent by the UE and can obtain the TA of the candidate cell. Then, the TA value can be included in the LTM cell switch command to inform the UE. After the UE receives the LTM cell switch command, if the LTM cell switch command contains the TA value of the target cell, the UE can omit the random access process to the target cell, that is, perform a LTM cell switch process without random access, a RACH-less LTM cell switch process.

[0102] In the RACH-less LTM cell switch process, the UE can send the first uplink data to the target cell through the configured uplink grant sent by the network. The configured uplink grant can be periodic or one-time, and the network may include the configured uplink grant in the LTM configuration or in the LTM cellswitch command. Alternatively, the UE can also obtain a dynamic uplink grant by monitoring the PDCCH in the target cell to send the first uplink data to the target cell.

[0103] When the LTM cell switch process is triggered (for example, the RRC layer receives an indication that the MAC layer or the physical layer receives an LTM cell switch command from the network side, that is, the MAC layer or the physical layer indicates that the LTM cell switch is triggered, wherein the MAC layer or the physical layer can be collectively referred to as the lower layer of the RRC layer), the UE (for example, the RRC layer of the UE) starts a cell switch timer for monitoring the LTM cellswitch process. When the LTM cell switch process is successfully completed, the UE stops the cellswitch timer. If the cell switch timer times out, the UE considers that the LTM cell switch process has failed. Among them, the UE may consider that the RACH-less LTM cell switch process is successfully completed after receiving a PDCCH addressed to the C-RNTI in the target cell, or after receiving an acknowledgment of the RRC reconfiguration completion message (for example, RLC ACK) in the target cell, or after receiving a downlink contention resolution (DL Contention Resolution) MAC CE in the target cell.

[0104] Cell DTX

[0105] In order to save power consumption of the network, the network can transmit discontinuously. The network can configure Cell DTX for the UE so that the UE knows how the network transmits discontinuously in a certain cell. After the network configures Cell DTX for the UE, Cell DTX can be activated by default, and Cell DTX can be activated and / or deactivated by indication after configuration. The Cell DTX configuration can include information such as the discontinuous transmission period, the duration of the start of transmission, the offset of the start of transmission, etc. Cell DTX can be divided into two parts: activation time and inactivation time. The network transmits data during the activation time, and does not transmit data during the inactivation time. The activation time of Cell DTX includes a transmission duration (on-duration) at the beginning of the Cell DTX cycle, and may also include a portion of the transmission duration extended due to various reasons (for example, due to the receipt of new uplink data from the UE, the transmission duration is extended in order to send a response to the UE). The inactivation time of Cell DTX can be other times in the Cell DTX cycle excluding the activation time of Cell DTX.

[0106] During the activation time of Cell DTX, the UE needs to monitor PDCCH to obtain downlink allocation and / or uplink authorization for new transmission and receive downlink data, that is, the UE's downlink monitoring and receiving behavior is not affected. During the inactive time of Cell DTX, the UE generally does not need to monitor PDCCH to obtain downlink allocation and / or uplink authorization for new transmission, but the UE still needs to monitor paging and obtain system messages. Generally, during the inactive time of Cell DTX, the UE's uplink transmission is not affected.

[0107] Cell DRX

[0108] In order to save power consumption of the network, the network can perform discontinuous reception. The network can configure Cell DRX for the UE so that the UE knows how the network performs discontinuous reception in a certain cell. After the network configures Cell DRX for the UE, Cell DRX can be activated by default, and Cell DRX can be activated and / or deactivated by indication after configuration. The Cell DRX configuration can include information such as the discontinuous reception period, the duration for starting reception, and the offset for starting reception. Cell DRX can be divided into two parts: activation time and inactivation time. The network receives data during the activation time, and does not receive data during the inactivation time. The activation time of Cell DRX includes a reception duration (on-duration) at the beginning of the Cell DRX cycle, and may also include a portion of the reception duration extended due to various reasons (for example, due to the sending of new downlink data, the reception duration is extended in order to receive the response of the UE). The inactivation time of Cell DRX can be other times in the Cell DRX cycle excluding the activation time of Cell DRX.

[0109] During the activation time of Cell DRX, the UE performs uplink transmission normally. During the inactive time of Cell DRX, the UE performs the random access process normally, but if the SR is triggered, the SR can be pending until the end of the deactivation time of Cell DRX (that is, entering the activation time of Cell DRX) and then sent, which means that if the SR transmission timing overlaps with the inactive time of Cell DRX, the SR will not be sent. Generally, during the inactive time of Cell DRX, the UE downlink monitoring or reception is not affected. During the inactive time of Cell DRX, the UE does not transmit / send data on the configured grant.

[0110] The network can send the Cell DTX / DRX configuration through RRC signaling. After receiving the RRC signaling containing the Cell DTX / DRX configuration, the UE can consider that the Cell DTX / DRX function is activated. When the UE receives the RRC signaling indicating the deletion of the Cell DTX / DRX configuration, the UE can consider that the Cell DTX / DRX function is deactivated. At the same time, the network can also activate or deactivate the Cell DTX / DRX function through L1 / L2 signaling.

[0111] When the UE changes from the source cell to a target cell according to the switching command or LTM cell switch command issued by the network, if the target cell has configured Cell DTX / DRX for the UE and the Cell DTX / DRX function has been activated, the UE can only receive data from the network side and send data to the network side in a timely manner during the activation time of Cell DTX / DRX. If the UE does not know the configuration and activation status of the Cell DTX / DRX of the target cell, the UE cannot receive data from the network side and send data to the network side in a timely manner, thereby affecting service performance. For the RACH-less LTM cell switch process, if the target cell has configured Cell DTX / DRX for the UE and the Cell DTX / DRX function has been activated, the UE cannot send the first uplink data to the network in a timely manner during the inactive time of Cell DTX / DRX. That is, if the UE does not know the configuration and activation status of the Cell DTX / DRX of the target cell, the UE cannot access the target cell in a timely manner to complete the LTM cell switch process.

[0112] The present invention discusses how UE performs switching and how to perform LTM cellswitch after introducing Cell DRX / DTX. Through the present invention, the influence of the inactive period of Cell DRX / DTX on the switching of UE or the performance of LTM cellswitch can be avoided, and the occurrence of switching failure or LTM cell switch failure can be avoided or reduced.

[0113] Hereinafter, several embodiments of the present invention for solving the above problems are described in detail.

[0114] Example 1

[0115] Optionally, in step S101, the UE receives an RRC message (eg, an RRC reconfiguration message) sent by the network. Optionally, the RRC message may include at least one of the following first information:

[0116] -Cell DTX / DRX configuration information of the target cell;

[0117] - an activation status indication of the Cell DTX / DRX function of the target cell (i.e., whether the current Cell DTX / DRX function of the target cell is activated or inactivated), for example, if the value of the indication is 0, it indicates that the Cell DTX / DRX function is deactivated, and if the value of the indication is 1, it indicates that the Cell DTX / DRX function is activated;

[0118] -T304 first value;

[0119] -T304 second value.

[0120] Wherein, optionally, the target cell may refer to a target SpCell. Optionally, the first information may be included in the configuration of the SpCell.

[0121] Optionally, if the RRC message includes a cell group configuration, the UE executes the cell group configuration; if the cell group configuration includes a primary cell group configuration, the UE executes the primary cell group configuration; if the RRC message includes a secondary cell group configuration, the UE executes the secondary cell group configuration; if the primary cell group configuration includes a SpCell configuration, the UE executes the SpCell configuration.

[0122] Optionally, in step S102, if the RRC message carries a synchronous reconfiguration, the UE performs a synchronous reconfiguration (i.e., switching) process. Optionally, during the UE's synchronous reconfiguration (i.e., switching) process, the UE starts a timer T304. Optionally, when at least one of the following conditions is met, the value of the T304 timer is set to the first value of T304:

[0123] - the RRC message includes Cell DTX / DRX configuration information of the target cell (optionally, the Cell DTX / DRX configuration information is to establish a Cell DTX / DRX configuration or to add / modify a Cell DTX / DRX configuration);

[0124] -The target cell is configured with Cell DTX / DRX;

[0125] -The Cell DTX / DRX function of the target cell is activated.

[0126] Optionally, when at least one of the following conditions is met, the value of the T304 timer is set to the second value of T304:

[0127] -The RRC message does not include the Cell DTX / DRX configuration information of the target cell;

[0128] -The RRC message includes deletion / release information of the Cell DTX / DRX configuration of the target cell;

[0129] -The target cell is not configured with Cell DTX / DRX;

[0130] -The Cell DTX / DRX function of the target cell is deactivated or not activated.

[0131] 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.

[0132] Optionally, "the RRC message contains a SpCell configuration with synchronous reconfiguration" may also mean: the RRC message contains a SpCell configuration with synchronous reconfiguration, or the cell group configuration contained in the RRC message contains a synchronous reconfiguration, or the cell group configuration contained in the RRC message contains a SpCell configuration with synchronous reconfiguration.

[0133] Optionally, in step S103, the UE monitors and receives Cell DTX / DRX activation / deactivation indication information in the target cell, and the indication information may be included in a MAC CE or a physical layer indication (eg, DCI).

[0134] Optionally, when 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 a method for activating Cell DTX / DRX, such as a MAC CE or a physical layer indication including an indication for activating the Cell DTX / DRX of the target cell, and / or the indication for activating the Cell DTX / DRX of the target cell is set to a specific value, such as 1; the indication information indicates a method for deactivating Cell DTX / DRX, such as a MAC CE or a physical layer indication including an indication for deactivating the Cell DTX / DRX of the target cell, and / or the indication for deactivating the Cell DTX / DRX of the target cell is set to another specific value, such as 0.

[0135] Optionally, the UE determines at least one of the following conditions:

[0136] -T304 timer is running;

[0137] - In step S102, the value of the T304 timer is set to the second value of T304;

[0138] -The Cell DTX / DRX activation / deactivation indication information indicates that the Cell DTX / DRX function of the target cell is activated (optionally, this condition can also be determined before the first two conditions).

[0139] When the UE satisfies at least one of the above conditions, the UE performs at least one of the following operations:

[0140] - Restart the T304 timer (optionally, the value of the T304 timer is set to the first value of T304 or the second value of T304);

[0141] - Extend the duration of a running T304 timer.

[0142] 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).

[0143] Example 2

[0144] Optionally, in step S201, the UE receives the LTM configuration sent by the network side. Optionally, the LTM configuration can be sent to the UE via an RRC message (e.g., an RRC reconfiguration message), wherein the LTM configuration may include but is not limited to: an LTM candidate cell configuration. After receiving the LTM configuration, the UE saves the received LTM candidate cell configuration. The LTM candidate cell configuration includes configurations corresponding to one or more candidate cells (e.g., various configurations included in the RRC reconfiguration message).

[0145] Optionally, the RRC message may further include at least one of the following information:

[0146] -Cell DTX / DRX configuration information of LTM candidate cells;

[0147] - An activation status indication of the Cell DTX / DRX function of the LTM candidate cell (i.e., whether the current Cell DTX / DRX function of the LTM candidate cell is activated or inactivated), for example, if the value of the indication is 0, it indicates that the Cell DTX / DRX function is deactivated, and if the value of the indication is 1, it indicates that the Cell DTX / DRX function is activated;

[0148] -The first value of the cell switch timer (corresponding to the LTM candidate cell);

[0149] -The second value of the cell switch timer (corresponding to the LTM candidate cell).

[0150] Optionally, in step S202, the UE receives the LTM cell switch command sent by the network side and executes the LTM cell switch process. Optionally, when the UE executes the LTM cell switch process, the UE starts a cell switch timer.

[0151] Optionally, when at least one of the following conditions is met, the value of the cell switch timer is set to the first value of the cell switch timer (of the target cell):

[0152] -The target cell is configured with Cell DTX / DRX;

[0153] -The Cell DTX / DRX function of the target cell is activated.

[0154] Optionally, when at least one of the following conditions is met, the value of the cell switch timer is set to the second value of the cell switch timer (of the target cell):

[0155] -The target cell is not configured with Cell DTX / DRX;

[0156] -The Cell DTX / DRX function of the target cell is deactivated or not activated.

[0157] The LTM cell switch command includes target cell information. Optionally, the target cell information is indicated by a corresponding LTM candidate cell (configuration) identifier or index value, that is, the target cell is one of the LTM candidate cells. The first value of the cell switch timer and / or the second value of the cell switch timer of the target cell, that is, the first value of the cell switch timer and / or the second value of the cellswitch timer of the LTM candidate cell (configuration) corresponding to the target cell.

[0158] 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 determination method is determined by determining whether the LTM candidate cell corresponding to the target cell is configured with Cell DTX / DRX or whether the Cell DTX / DRX function is activated / deactivated. That is, when the LTM candidate cell (configuration) corresponding to the target cell includes Cell DTX / DRX configuration (optionally, the 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 considered to be configured with Cell DTX / DRX, and optionally, the Cell DTX / DRX function of the target cell is considered to be activated; when the LTM candidate cell (configuration) corresponding to the target cell does not include Cell DTX / DRX configuration (or the LTM candidate cell (configuration) corresponding to the target cell includes deletion / release of the Cell DTX / DRX configuration), the target cell is considered to be not configured with Cell DTX / DRX, and optionally, the Cell DTX / DRX function of the target cell is considered to be deactivated or not activated. Alternatively, optionally, when the Cell DTX / DRX function of the LTM candidate cell (configuration) corresponding to the target cell is activated, the Cell DTX / DRX function of the target cell is considered to be activated; when the Cell DTX / DRX function of the LTM candidate cell (configuration) 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.

[0159] Among them, optionally, the first value of the cell switch timer and the second value of the cell switch timer are included in the LTM candidate cell configuration of the LTM configuration, and the first value of the cell switch timer can be greater than the second value of the cell switch timer.

[0160] Optionally, in step S203, the UE monitors and receives Cell DTX / DRX activation / deactivation indication information in the target cell, and the indication information may be included in a MAC CE or a physical layer indication (e.g., DCI). The difference between step S203 and step S103 is that: Optionally, the UE determines at least one of the following conditions:

[0161] -cell switch timer is running;

[0162] - In step S202, the value of the cell switch timer is set to the second value of the cell switch timer;

[0163] -The Cell DTX / DRX activation / deactivation indication information indicates that the Cell DTX / DRX function of the target cell is activated (this condition can also be judged before the first two conditions).

[0164] When the UE satisfies at least one of the above conditions, the UE performs at least one of the following operations:

[0165] - Restart the cell switch timer (optionally, the value of the cell switch timer is set to the cell switch first value or the cell switch second value);

[0166] - Extend the duration of the running cell switch timer (the extended duration can be configured by the network side through RRC message / MAC CE / physical layer indication, or a fixed value specified by the protocol; or extend the duration of the running cell switch timer to the same length as the first value of the cell switch).

[0167] The rest of the processing in step S203 is the same as that in step S103.

[0168] Example 3

[0169] According to Embodiment 2, this embodiment includes step S301 and step S302.

[0170] Optionally, in step S301, the UE receives the LTM configuration sent by the network side. Optionally, step S301 is the same as step S201.

[0171] Optionally, in step S302, the UE receives an LTM cell switch command sent by the network side and performs an LTM cell switch process. Optionally, the LTM cell switch command sent by the network side and received by the UE may include at least one of the following information:

[0172] -Cell DTX / DRX configuration information of the target cell;

[0173] - an activation status indication of the Cell DTX / DRX function of the target cell (i.e., whether the current Cell DTX / DRX function of the target cell is activated or inactivated), for example, if the value of the indication is 0, it indicates that the Cell DTX / DRX function is deactivated, and if the value of the indication is 1, it indicates that the Cell DTX / DRX function is activated;

[0174] -cell switch timer first value;

[0175] -The second value of the cell switch timer.

[0176] Optionally, when the UE performs the LTM cell switch process, the UE starts a cell switch timer.

[0177] Optionally, when at least one of the following conditions is met, the value of the cell switch timer is set to the first value of the cell switch timer (of the target cell):

[0178] -The target cell is configured with Cell DTX / DRX;

[0179] -The Cell DTX / DRX function of the target cell is activated.

[0180] Optionally, when at least one of the following conditions is met, the value of the cell switch timer is set to the second value of the cell switch timer (of the target cell):

[0181] -The target cell is not configured with Cell DTX / DRX;

[0182] -The Cell DTX / DRX function of the target cell is deactivated or not activated.

[0183] The LTM cell switch command includes target cell information. Optionally, the target cell information is indicated by a corresponding candidate cell (configuration) identifier or index value, that is, the target cell is one of the LTM candidate cells.

[0184] The main difference from step S202 is that in step S202, whether the target cell is configured with Cell DTX / DRX and whether the Cell DTX / DRX function of the target cell is activated is determined according to the LTM candidate cell (configuration) corresponding to the target cell and the Cell DTX / DRX configuration information of the saved LTM candidate cell (configuration); while in step S302, the Cell DTX / DRX configuration of the target cell and the activation status of the Cell DTX / DRX function of the target cell are directly sent to the UE in the LTM cellswitch command, so the UE can directly determine the Cell DTX / DRX configuration of the target cell and the activation status of the Cell DTX / DRX function of the target cell.

[0185] For example, through the second judgment method, the second judgment method is: when the LTM cell switch command contains the Cell DTX / DRX configuration of the target cell (optionally, the Cell DTX / DRX configuration information is to establish the Cell DTX / DRX configuration or to add / modify the Cell DTX / DRX configuration), it is considered that the target cell is configured with Cell DTX / DRX, and optionally, it is considered that the Cell DTX / DRX function of the target cell is activated; when the LTM cell switch command does not contain the Cell DTX / DRX configuration (or the LTM cell switch command contains deletion / release of the Cell DTX / DRX configuration), it is considered that the target cell is not configured with Cell DTX / DRX, and optionally, it is considered that the Cell DTX / DRX function of the target cell is deactivated or not activated. Alternatively, optionally, when the LTM cell switch command indicates that the Cell DTX / DRX function of the target cell is activated, the Cell DTX / DRX function of the target cell is considered to be activated; when the LTM cell switch command indicates that the Cell DTX / DRX function of 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.

[0186] Optionally, in step S303, the UE monitors and receives Cell DTX / DRX activation / deactivation indication information in the target cell, and the indication information may be included in a MAC CE or a physical layer indication (eg, DCI). Optionally, step S303 is the same as step S203.

[0187] Example 4

[0188] According to Embodiment 2 and Embodiment 3, this embodiment includes step S401 and step S402.

[0189] Optionally, in step S401, the UE receives the LTM configuration sent by the network side. Optionally, step S401 is the same as step S201.

[0190] Optionally, in step S402, the UE receives an LTM cell switch command sent by the network side and performs an LTM cell switch process. The LTM cell switch command sent by the network side and received by the UE may include at least one of the following information:

[0191] -Cell DTX / DRX configuration information of the target cell;

[0192] - an activation status indication of the Cell DTX / DRX function of the target cell (i.e., whether the current Cell DTX / DRX function of the target cell is activated or inactivated), for example, if the value of the indication is 0, it indicates that the Cell DTX / DRX function is deactivated, and if the value of the indication is 1, it indicates that the Cell DTX / DRX function is activated;

[0193] -cell switch timer first value;

[0194] -cell switch timer second value;

[0195] - The value of the Timing Advance (TA) of the target cell.

[0196] Optionally, when the UE performs the LTM cell switch process, if at least one of the following conditions is met, the UE initiates a RACH-less LTM cell switch process, namely:

[0197] -The target cell is configured with Cell DTX / DRX;

[0198] -The Cell DTX / DRX function of the target cell is activated;

[0199] -The LTM cell switch command includes the timing advance (TA) value of the target cell and the timing advance (TA) value of the target cell is a valid value.

[0200] Optionally, during the UE performing the LTM cell switch process, when at least one of the following conditions is met, the UE initiates a random access procedure to the target cell:

[0201] -The target cell is not configured with Cell DTX / DRX;

[0202] -The Cell DTX / DRX function of the target cell is deactivated or not activated;

[0203] -The value of the timing advance (TA) of the target cell included in the LTM cell switch command is an invalid value.

[0204] 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 according to the first judgment method described in step S202, or according to the second judgment method described in step S302.

[0205] Optionally, in step S403, the UE monitors and receives Cell DTX / DRX activation / deactivation indication information in the target cell, and the indication information may be included in a MAC CE or a physical layer indication (eg, DCI).

[0206] Optionally, the UE determines at least one of the following conditions (optionally, the order of the conditions can be swapped):

[0207] -cell switch timer is running;

[0208] -The UE is performing a RACH-less LTM cell switch procedure (i.e., the RACH-less cell switch procedure has been initiated and has not been successfully completed or has not failed);

[0209] -The Cell DTX / DRX activation / deactivation indication information indicates that the Cell DTX / DRX function of the target cell is activated.

[0210] When the UE satisfies at least one of the above conditions, the UE performs at least one of the following operations:

[0211] -Stop the RACH-less LTM cell switch process;

[0212] -Initiate a random access procedure in the target cell;

[0213] - Restart the cell switch timer (optionally, the value of the cell switch timer may be the first value of the cell switch timer or the second value of the cell switch timer for the LTM cell switch process that requires initiating random access).

[0214] Optionally, the first value of the cell switch timer and the second value of the cell switch timer in this embodiment may both be for the RACH-less LTM cell switch process.

[0215] Example 5

[0216] According to embodiment 4, in the process of UE initiating RACH-less LTM cell switch (or expressed as when the cell switch timer is running), regardless of whether the UE is in the inactive time of Cell DRX of the target cell (when the Cell DRX of the target cell is configured, and optionally, the Cell DRX function of the target cell is activated), the UE can send the first uplink data to the target cell through the configured uplink authorization sent by the network. In the process of UE initiating RACH-less LTM cell switch (or expressed as when the cell switch timer is running), regardless of whether the UE is in the inactive time of Cell DTX of the target cell (when the Cell DTX of the target cell is configured, and optionally, the Cell DTX function of the target cell is activated), the UE can send the first uplink data to the target cell by monitoring PDCCH in the target cell to obtain a dynamic uplink authorization.

[0217] Another expression of this embodiment may be: the UE does not send data on the configured uplink authorization during the inactive time of the Cell DRX of the target cell (when the Cell DRX of the target cell is configured, and optionally, when the Cell DRX function of the target cell is activated), except that the UE sends the first uplink data to the target cell on the configured uplink authorization during the RACH-less LTM cell switch process (or expressed as when the cell switch timer is running); the UE does not monitor the PDCCH to receive new data during the inactive time of the Cell DTX of the target cell (when the Cell DTX of the target cell is configured, and optionally, when the Cell DTX function of the target cell is activated) (that is, the UE does not monitor the PDCCH if the retransmission timer is not started), except that the UE monitors the PDCCH to obtain the uplink authorization in order to send the first uplink data to the target cell during the RACH-less LTM cell switch process (or expressed as when the cell switch timer is running).

[0218] The embodiments of the present invention are described in detail above. The user equipment of the present invention is described below.

[0219] Figure 6 1 is a simplified structural diagram of a user equipment UE according to the present invention. Figure 6As shown, the user equipment UE600 includes a processor 601 and a memory 602. The processor 601 may include, for example, a microprocessor, a microcontroller, an embedded processor, etc. The memory 602 may include, for example, a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memories, etc. Program instructions are stored on the memory 602. When the instructions are executed by the processor 601, the above method performed by the user equipment described in detail in the present invention may be executed.

[0220] The method and the related equipment of the present disclosure have been described above in conjunction with the preferred embodiments. It can be understood by those skilled in the art that the method shown above is only exemplary, and the embodiments described above can be combined with each other without contradiction. The method of the present invention is not limited to the steps and sequence shown above.

[0221] The user equipment shown above may include more modules, for example, modules that can be developed or developed in the future and can be used for base stations, MMEs, or UEs, etc. The various identifiers shown above are only exemplary and not restrictive, and the present disclosure is not limited to the specific information elements used as examples of these identifiers. Those skilled in the art may make many changes and modifications based on the teachings of the illustrated embodiments.

[0222] It should be understood that the above embodiments of the present disclosure can be implemented by software, hardware, or a combination of software and hardware. For example, the various components inside the base station and user equipment in the above embodiments can be implemented by a variety of devices, including but not limited to: analog circuit devices, digital 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.

[0223] The program running on the device according to the present invention can be a program that enables a computer to implement the functions of the embodiments of the present invention by controlling a central processing unit (CPU). The program or the information processed by the program can be temporarily stored in a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memory systems.

[0224] The program for realizing the functions of various embodiments of the present invention can be recorded on a computer-readable recording medium. The corresponding functions can be realized by making a computer system read the program recorded on the recording medium and executing these programs. The so-called "computer system" herein can be a computer system embedded in the device, and can include an operating system or hardware (such as a peripheral device). "Computer-readable recording medium" can be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium of a short-term dynamic storage program, or any other recording medium that is computer-readable.

[0225] The various features or functional modules of the devices used in the above embodiments can be implemented or executed by circuits (e.g., single-chip 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 devices. The general-purpose processor may be a microprocessor, or any existing processor, controller, microcontroller, or state machine. The above circuits may be digital circuits or analog circuits. In the case where new integrated circuit technologies have emerged to replace 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.

[0226] In addition, the present invention is not limited to the above-mentioned 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 can be used as terminal devices or communication devices, such as AV equipment, kitchen equipment, cleaning equipment, air conditioners, office equipment, vending machines, and other household appliances.

[0227] As mentioned above, the embodiments of the present invention have been described in detail with reference to the accompanying drawings. However, the specific structure is not limited to the above embodiments, and the present invention also includes any design changes that do not deviate from the main purpose of the present invention. In addition, the present invention can be modified in various ways within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. In addition, the components with the same effect described in the above embodiments can be replaced with each other.

Claims

1. A method performed by a user equipment, comprising the following steps: The user equipment receives an RRC message sent by the network; In a case where the RRC message carries a synchronization reconfiguration, the user equipment performs a synchronization reconfiguration process; and The user equipment monitors and receives Cell DTX / DRX activation / deactivation indication information in the 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 according to claim 1, wherein: During the synchronization reconfiguration process performed by the user equipment, the user equipment starts a timer T304. When at least one of the following conditions is met, the value of the T304 timer is set to a first value of T304: The RRC message includes 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. When at least one of the following conditions is met, the value of the T304 timer is set to the second value of T304: The RRC message does not include the CellDTX / DRX configuration information of the target cell; The RRC message includes deletion / release information of the CellDTX / DRX configuration of the target cell; The target cell is not configured with CellDTX / DRX; and The CellDTX / DRX function of the target cell is deactivated or not activated.

3. The method according to claim 2, wherein: The user equipment determines at least one of the following conditions: The T304 timer is running; The value of the T304 timer is set to a second value of T304 during the synchronization reconfiguration process 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, When the user equipment determines that at least one of the above conditions is met, the user equipment performs at least one of the following operations: Restarting the T304 timer; and The duration of the running T304 timer is extended.

4. A method performed by a user equipment, comprising the following steps: The user equipment receives the LTM configuration sent by the network side; The user equipment receives the LTM cell switch command sent by the network side and executes the LTM cell switch process; and The user equipment monitors and receives Cell DTX / DRX activation / deactivation indication information in the target cell, In the case where the LTM configuration is sent to the user equipment via an RRC message, the RRC message includes at least one of the following information: CellDTX / DRX configuration information of LTM candidate cells; LTM candidate cell CellDTX / DRX function activation status indication; A first value of a cell switch timer corresponding to the LTM candidate cell; and The second value of the cell switch timer corresponding to the LTM candidate cell.

5. The method according to 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; The first value of the cell switch timer; The second value of the cell switch timer; and The value of the timing advance TA of the target cell.

6. The method performed by a user equipment according to claim 4 or 5, wherein: During the LTM cell switch process performed by the user equipment, the user equipment starts a cell switch timer, and when at least one of the following conditions is met, the value of the cell switch timer is set to the first value of the cell switch timer of the target cell: The target cell is configured with CellDTX / DRX; and The CellDTX / DRX function of the target cell is activated. When at least one of the following conditions is met, the value of the cell switch timer is set to the second value of the cell switch timer of the target cell: The target cell is not configured with CellDTX / DRX; and The CellDTX / DRX function of the target cell is deactivated or not activated.

7. The method performed by the user equipment according to claim 6, wherein: The user equipment determines at least one of the following conditions: The cell switch timer is running; The value of the cell switch timer is set to a second value of the cell switch timer during the LTM cell switch process 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, When the user equipment determines that at least one of the above conditions is met, the user equipment performs at least one of the following operations: Restarting the cell switch timer; and The duration of the cell switch timer that is running is extended.

8. The method performed by a user equipment according to claim 4 or 5, wherein: In the process of performing LTM cell switch by the user equipment, the user equipment initiates a RACH-less LTM cell switch process when 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; as well as The LTM cell switch command includes the value of the timing advance TA of the target cell and the value of the timing advance TA of the target cell is a valid value, In the process of the user equipment performing the LTM cell switch, when at least one of the following conditions is met, the user equipment initiates a random access procedure to the target cell: The target cell is not configured with CellDTX / DRX; The CellDTX / DRX function of the target cell is deactivated or not activated; and The value of the timing advance TA of the target cell included in the LTM cell switch command is an invalid value.

9. The method performed by the user equipment according to claim 8, wherein: The user equipment determines at least one of the following conditions: The cell switch timer is running; The user equipment is performing a RACH-less LTM cell switch process; as well as The Cell DTX / DRX activation / deactivation indication information indicates that the Cell DTX / DRX function of the target cell is activated, When the user equipment determines that at least one of the above conditions is met, the user equipment performs at least one of the following operations: Stop the RACH-less LTM cell switch process; Initiate a random access procedure in the target cell; and Restart the cell switch timer.

10. A user equipment, comprising: processor; as well as A memory storing instructions; Wherein, when the instructions are executed by the processor, the method performed by the user equipment according to any one of claims 1 to 9 is executed.

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