Wireless communication method, device and equipment

Abstract

The invention discloses a wireless communication method, device and equipment, and belongs to the field of communication, and the wireless communication method comprises the steps that if RLF is detected, a terminal executes cell selection; if the detected RLF is triggered when the RLC reaches the maximum retransmission times and the selected cell is an LTM candidate cell, the terminal executes a first operation; wherein the first operation comprises one of the following operations: sending an RRC reconstruction request in the selected cell, executing switching for the selected cell, resetting an RLC retransmission time counter, and executing RLC reconstruction or PDCP (Packet Data Convergence Protocol) data recovery of AM DRB. According to the embodiment of the invention, the problem that the corresponding RLC entity cannot continue data transmission after the RLC entity triggers the RLF when the RLC reaches the maximum retransmission times can be solved.

Description

Technical Field

[0001] The present application relates to the field of communications, and more specifically, to a wireless communication method, apparatus, and device. Background Art

[0002] Currently, when a Radio Link Failure (RLF) occurs, the terminal performs Layer 1 / L2-triggered mobility (LTM) fast recovery instead of Radio Link Control (RLC) reestablishment to reduce data interruption. However, if the RLF is caused by the RLC reaching its maximum retransmission count, performing LTM fast recovery will prevent the RLC entity from continuing data transmission due to reaching its maximum retransmission count. This may result in a failure to switch to the target cell through fast recovery, or even if successful, the failure to perform normal data transmission. Summary of the Invention

[0003] The embodiments of the present application provide a wireless communication method, apparatus, and device, which can solve the problem that the corresponding RLC entity cannot continue to transmit data after the RLC reaches the maximum number of retransmissions and triggers RLF.

[0004] In a first aspect, a wireless communication method is provided, comprising:

[0005] If a radio link failure (RLF) is detected, the terminal performs cell selection;

[0006] If the detected RLF is triggered by a radio link control RLC reaching a maximum number of retransmissions, and the selected cell is a layer 1 / layer 2 triggered mobility LTM candidate cell, the terminal performs a first operation;

[0007] The first operation includes one of the following: sending a radio resource control RRC re-establishment request in the selected cell, performing handover for the selected cell, resetting an RLC retransmission counter, performing RLC re-establishment or packet data convergence protocol PDCP data recovery of an acknowledgement mode AM data radio bearer DRB.

[0008] In a second aspect, a wireless communication method is provided, including:

[0009] The network side device sends second indication information to the terminal;

[0010] The second indication information is used to indicate that if the radio link failure RLF is triggered by the radio link control RLC reaching the maximum number of retransmissions and the selected cell is a mobility LTM candidate cell triggered by layer 1 / layer 2, the terminal is allowed to perform the first operation;

[0011] The first operation includes one of the following:

[0012] A radio resource control (RRC) re-establishment request is sent in the selected cell, a handover is performed for the selected cell, an RLC retransmission counter is reset, and RLC re-establishment or PDCP data recovery of an acknowledged mode AM data radio bearer (DRB) is performed.

[0013] According to a third aspect, a wireless communication method is provided, including:

[0014] The terminal resets the radio link control RLC retransmission count counter when performing handover; or,

[0015] If a radio link failure RLF or a handover failure is detected, the terminal resets the RLC retransmission count counter when performing fast recovery.

[0016] In a fourth aspect, a wireless communication device is provided, comprising: a processing unit;

[0017] If a radio link failure (RLF) is detected, the processing unit is configured to perform cell selection;

[0018] If the detected RLF is triggered by a radio link control RLC reaching a maximum number of retransmissions, and the selected cell is a layer 1 / layer 2 triggered mobility LTM candidate cell, the processing unit is further configured to perform a first operation;

[0019] The first operation includes one of the following: sending a radio resource control RRC re-establishment request in the selected cell, performing handover for the selected cell, resetting an RLC retransmission counter, performing RLC re-establishment or packet data convergence protocol PDCP data recovery of an acknowledgement mode AM data radio bearer DRB.

[0020] According to a fifth aspect, a wireless communication device is provided, including:

[0021] a transceiver unit, configured to send second indication information to the terminal;

[0022] The second indication information is used to indicate that if the radio link failure RLF is caused by the radio link control RLC reaching the maximum number of retransmissions and the selected cell is a mobility LTM candidate cell triggered by layer 1 / layer 2, the terminal is allowed to perform the first operation;

[0023] The first operation includes one of the following:

[0024] A radio resource control (RRC) re-establishment request is sent in the selected cell, a handover is performed for the selected cell, an RLC retransmission counter is reset, and RLC re-establishment or PDCP data recovery of an acknowledged mode AM data radio bearer (DRB) is performed.

[0025] According to a sixth aspect, a wireless communication device is provided, comprising: a processing unit;

[0026] The processing unit is configured to reset a radio link control RLC retransmission count counter when performing a handover; or,

[0027] If a radio link failure RLF or a handover failure is detected, the processing unit is configured to reset the RLC retransmission count counter when performing fast recovery.

[0028] In the seventh aspect, a terminal is provided, which includes a transceiver, a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the first aspect or the third aspect are implemented.

[0029] In an eighth aspect, a terminal is provided, comprising a processor and a communication interface;

[0030] If a radio link failure (RLF) is detected, the processor is configured to perform cell selection;

[0031] If the detected RLF is triggered by a radio link control RLC reaching a maximum number of retransmissions, and the selected cell is a layer 1 / layer 2 triggered mobility LTM candidate cell, the processor is further configured to perform a first operation;

[0032] The first operation includes one of the following: sending a radio resource control RRC re-establishment request in the selected cell, performing handover for the selected cell, resetting an RLC retransmission counter, performing RLC re-establishment or packet data convergence protocol PDCP data recovery of an acknowledgement mode AM data radio bearer DRB.

[0033] In a ninth aspect, a terminal is provided, comprising a processor and a communication interface;

[0034] The processor is configured to reset a radio link control RLC retransmission count counter when performing a handover; or,

[0035] If a radio link failure RLF or a handover failure is detected, the processor is configured to reset the RLC retransmission count counter when performing fast recovery.

[0036] In the tenth aspect, a network side device is provided, which includes a transceiver, a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the method described in the second aspect are implemented.

[0037] In an eleventh aspect, a network-side device is provided, including a processor and a communication interface;

[0038] Wherein, the communication interface is used to send second indication information to the terminal;

[0039] The second indication information is used to indicate that if the radio link failure RLF is triggered by the radio link control RLC reaching the maximum number of retransmissions and the selected cell is a mobility LTM candidate cell triggered by layer 1 / layer 2, the terminal is allowed to perform the first operation;

[0040] The first operation includes one of the following:

[0041] A radio resource control (RRC) re-establishment request is sent in the selected cell, a handover is performed for the selected cell, an RLC retransmission counter is reset, and RLC re-establishment or PDCP data recovery of an acknowledged mode AM data radio bearer (DRB) is performed.

[0042] In the twelfth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented, or the steps of the method described in the third aspect are implemented.

[0043] In the thirteenth aspect, a wireless communication system is provided, including: a terminal and a network side device; wherein, the terminal can be used to execute the steps of the method described in the first aspect, the network side device can be used to execute the steps of the method described in the second aspect; or the terminal can be used to execute the steps of the method described in the third aspect.

[0044] In the fourteenth aspect, a chip is provided, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the method as described in the first aspect, or the method as described in the second aspect, or the method as described in the third aspect.

[0045] In the fifteenth aspect, a computer program / program product is provided, which is stored in a storage medium and is executed by at least one processor to implement the steps of the wireless communication method as described in any one of the first to third aspects.

[0046] In the embodiments of the first and second aspects above, if RLF is triggered by RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal sends an RRC reestablishment request in the selected cell, and does not perform cell switching or fast recovery in the selected cell but directly sends an RRC reestablishment request. This can avoid switching failures caused by the RLC retransmission counter reaching the maximum value, or avoid the problem of still being unable to perform data transmission after switching to the intra-DU cell, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue to perform data transmission, and can also solve the problem that the corresponding RLC entity cannot continue to perform data transmission after the RLC reaches the maximum number of retransmissions and triggers RLF.

[0047] Alternatively, if the RLF is triggered by the RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal performs switching for the selected cell and performs RLC reconstruction during the rapid recovery process, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission. It can also solve the problem that the corresponding RLC entity cannot continue data transmission after the RLC reaches the maximum number of retransmissions and triggers RLF.

[0048] Alternatively, if the RLF is triggered by the RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal resets the RLC retransmission counter to avoid handover failure caused by the RLC retransmission counter reaching the maximum value, or to avoid the problem of data transmission still not being able to be performed after the handover, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission, and can also solve the problem that the corresponding RLC entity cannot continue data transmission after the RLC reaches the maximum number of retransmissions to trigger RLF.

[0049] Alternatively, if the RLF is triggered by RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal performs RLC reconstruction or PDCP data recovery of the AM DRB to avoid handover failure caused by the RLC retransmission counter reaching the maximum value, or to avoid the problem of data transmission still not being able to be performed after the handover, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission, and can also solve the problem that the corresponding RLC entity cannot continue data transmission after the RLC reaches the maximum number of retransmissions to trigger RLF.

[0050] In an embodiment of the third aspect, the terminal resets the RLC retransmission counter when performing a handover, thereby enabling the RLC retransmission counter to better match the cell after the handover, thereby improving data transmission reliability after the handover. Alternatively, if an RLF or handover failure is detected, the terminal resets the RLC retransmission counter when performing a fast recovery, ensuring that the terminal can send an RRC reconfiguration complete message or other data information on the target cell, thereby quickly switching to the target cell and improving data transmission reliability in the target cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0052] Figure 1 This is a schematic diagram of a communication system architecture provided in an embodiment of the present application.

[0053] Figure 2 This is a schematic diagram of a CU-DU architecture provided in this application.

[0054] Figure 3 This is a schematic diagram of an LTM process provided by this application.

[0055] Figure 4 It is a schematic flowchart of a wireless communication method provided according to an embodiment of the present application.

[0056] Figure 5 This is a schematic flowchart of another wireless communication method provided according to an embodiment of the present application.

[0057] Figure 6 This is a schematic flowchart of another wireless communication method provided according to an embodiment of the present application.

[0058] Figure 7 This is a schematic block diagram of a wireless communication device provided according to an embodiment of the present application.

[0059] Figure 8 It is a schematic block diagram of another wireless communication device provided according to an embodiment of the present application.

[0060] Figure 9 This is a schematic block diagram of another wireless communication device provided according to an embodiment of the present application.

[0061] Figure 10 This is a schematic block diagram of a communication device provided according to an embodiment of the present application.

[0062] Figure 11 This is a schematic diagram of the hardware structure of a terminal provided according to an embodiment of the present application.

[0063] Figure 12 This is a schematic block diagram of a network-side device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0064] The following will be combined with the accompanying drawings in the embodiments of this application to clearly describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0065] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same type, and do not limit the number of objects, for example, the first object can be one or more. In addition, "or" in this application represents at least one of the connected objects. For example, "A or B" covers three options, namely, Option 1: including A but not including B; Option 2: including B but not including A; Option 3: including both A and B. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0066] The term "indication" in this application can be either a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, the operation to be performed, or the requested result, etc. in the instruction sent; an indirect indication can be understood as the receiver determining the corresponding information based on the instruction sent by the sender, or making a judgment and determining the operation to be performed or the requested result, etc. based on the judgment result.

[0067] It is worth noting that the technology described in the embodiments of the present application is not limited to the Internet of Things (IoT) system, but can also be used in other wireless communication systems, such as Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA), Wireless Local Area Networks (WLAN), Wireless Fidelity (WiFi), Bluetooth system, or other systems. In the embodiments of the present application, the terms "system" and "network" are often used interchangeably, and the technology described can be used for the systems and radio technologies mentioned above, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in most of the following description, but these techniques can also be applied to systems other than NR systems, such as 6G (6 th Generation, 6G) communication system.

[0068] Figure 1The block diagram of a wireless communication system applicable to the embodiments of the present application is shown. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a notebook computer, a personal digital assistant (PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), an augmented reality (AR), a virtual reality (VR) device, a robot, a wearable device (Wearable Device), an aircraft (flight vehicle), a vehicle user equipment (VUE), a ship-borne device, a pedestrian user equipment (PUE), a smart home (home appliances with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture, etc.), a game console, a personal computer (PC), a teller machine, or a self-service machine, etc., and other terminal-side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle-mounted device can also be called a vehicle-mounted terminal, vehicle-mounted controller, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application.

[0069] The network-side device 12 may include an access network device, which may also be referred to as a radio access network (RAN) device, a radio access network function, or a radio access network unit. The access network device may include a base station, a wireless local area network (WLAN) access point (AS), or a wireless fidelity (WiFi) node. Among them, the base station can be referred to as Node B (NB), Evolved Node B (eNB), the next generation Node B (gNB), New Radio Node B (NR Node B), access point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home Evolved Node B (home evolved NodeB), Transmission Reception Point (TRP) or other appropriate terms in the relevant field. As long as the same technical effect is achieved, the base station is not limited to specific technical vocabulary. It should be noted that in the embodiment of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

[0070] To facilitate a better understanding of the embodiments of the present application, a central unit (CU)-distributed unit (DU) is described.

[0071] The NR access network splits the gNB into gNB-CU and gNB-DU, and connects them through the F1 interface. Specifically, the CU-DU architecture diagram can be shown as follows Figure 2 shown.

[0072] like Figure 2 As shown in Figure 1, the 5G Core Network (5GC) is connected to the gNB in ​​the Next Generation Radio Access Network (NG-RAN) via the NG interface, and gNBs are connected to each other via the Xn C interface. Figure 2 As shown in Figure 1, a gNB consists of only one CU, one or more DUs, and each DU contains one or more cells. The CU includes the Packet Data Convergence Protocol (PDCP) and the protocol stack above it, while the DU includes the protocol stack below the PDCP layer (such as the Radio Link Control (RLC), Media Access Control (MAC), and the Physical (PHY) layer).

[0073] On the control plane, the CU includes the Radio Resource Control (RRC) and the PDCP (PDCP-C) of the control plane; on the user plane, the CU includes the Service Data Adaptation Protocol (SDAP) and the PDCP (PDCP-U) of the user plane.

[0074] For cell handover within the same DU, RLC reestablishment is not required due to the shared RLC entity. However, for cell handover between different DUs, RLC reestablishment and PDCP data recovery of Acknowledged Mode (AM) Data Radio Bearer (DRB) are required.

[0075] In layer 1 / layer 2 triggered mobility (L1 / L2-triggered mobility, LTM), only LTM switching under the same CU is supported. The network does not directly indicate whether the serving cell and the candidate cell are intra-DU or inter-DU. Instead, it configures ltm-ServingCellNoResetID for the serving cell and ltm-NoResetID for each candidate cell. When ltm-ServingCellNoResetID and ltm-NoResetID are the same, the UE does not need to perform RLC re-establishment and PDCP data recovery when switching to the candidate cell.

[0076] To facilitate a better understanding of the embodiments of the present application, LTM is explained.

[0077] To reduce handover latency, LTM was introduced. The network preconfigures multiple LTM candidate cells. The DU uses Layer 1 / Layer 2 (L1 / L2) signaling to instruct the terminal to switch to an appropriate candidate cell based on the Layer 1 measurement results reported by the terminal. LTM only supports cell handover within the same CU. Candidate cells can belong to the same DU as the source cell or a different DU.

[0078] Specifically, the LTM process can be as follows Figure 3 As shown, the following steps may be specifically included:

[0079] Step 1. The UE sends a measurement report to the gNB.

[0080] Step 2. The gNB sends an RRC reconfiguration message (LTM candidate configuration) to the UE.

[0081] Step 3. The UE sends an RRC Reconfiguration Complete message to the gNB.

[0082] Step 4a. DL synchronization with candidate cell;

[0083] Step 4b. Uplink synchronization with candidate cells (UL synchronization with candidate cell);

[0084] Step 5. The UE sends an L1 measurement report to the gNB.

[0085] Step 6. The gNB sends a cell handover command to the UE (e.g., carried by a Media Access Control Element (MAC CE)).

[0086] Step 7. Initiate random access procedure;

[0087] Step 8. LTM completed.

[0088] To facilitate a better understanding of the embodiments of the present application, LTM fast recovery is explained.

[0089] After a Radio Link Failure (RLF) or Handover Failure (HOF) occurs, the UE performs cell selection. If the selected cell is an LTM candidate cell and the network is configured to attempt LTM switching (attempt LTM-Switch), the UE performs LTM switching to the selected LTM candidate cell. By performing a handover instead of reestablishment, the purpose of rapid recovery is achieved.

[0090] To facilitate a better understanding of the embodiments of the present application, RLF is explained.

[0091] There are many situations in which RLF may occur, such as T310 timeout (t310-Expiry), random access problem (randomAccessProblem), RLC reaching the maximum number of retransmissions (rlc-MaxNumRetx), beam failure recovery failure (beamFailureRecoveryFailure), Listen Before Talk (LBT) failure (lbtFailure-r16), and T312 timeout (t312-expiry-r17).

[0092] The RLC reaches the maximum number of retransmissions when RETX_COUNT = maxRetxThreshold for a Radio Link Control service data unit (RLC SDU) or RLC SDU segment. At this point, the RLC layer notifies the upper layer that the maximum number of retransmissions has been reached. When the RLC reaches the maximum number of retransmissions, the corresponding RLC entity cannot continue data transmission.

[0093] To facilitate a better understanding of the embodiments of the present application, random access is described.

[0094] Random access is divided into two categories, four-step random access (4-step RACH) and two-step random access (2-step RACH);

[0095] Both types support contention-based random access (CBRA) and contention-free random access.

[0096] The 4-step CBRA process can include the following steps:

[0097] (1) The UE sends message 1 (Msg 1), including a preamble, to the gNB via the Physical Random Access Channel (PRACH).

[0098] (2) The UE monitors message 2 (Msg 2), i.e., the Random Access Response (RAR), sent by the network within the configured time window.

[0099] (3) After receiving the RAR, the UE uses the uplink resources allocated by the network to send message 3 (Msg 3);

[0100] (4) The UE monitors message 4 (Msg 4) (contention resolution). If the contention resolution fails, the UE falls back to Msg 1 transmission.

[0101] The 2-step CBRA process can include the following steps:

[0102] (1) The UE transmits the preamble through the PRACH channel and the payload through the Physical Uplink Shared Channel (PUSCH) pre-allocated by the network side. Message A (MsgA) contains both parts.

[0103] (2) The UE monitors message B (Msg B) sent by the network within the configured time window. If contention resolution is successful, the UE ends the random access procedure. If a fallback indication is received in Msg B, the UE uses the uplink grant (UL grant) scheduled in the fallback indication to perform Msg 3 transmission. If contention resolution fails after Msg 3 transmission (retransmission), the UE returns to Msg A transmission. If multiple 2-step RACH attempts fail, the UE is configured to switch to 4-step RACH.

[0104] In order to facilitate a better understanding of the embodiments of the present application, the problems solved by the present application are explained.

[0105] In LTM, after RLF is supported, fast recovery is initiated on the LTM candidate cell. When the target cell for fast recovery is an intra-DU cell, RLC does not perform re-establishment to reduce data interruption.

[0106] One case of RLF is when the UE's RLC reaches the maximum number of retransmissions. In this case, if the UE performs fast recovery on the intra-DU cell and the RLC is not reestablished, the UE may not be able to switch to the target cell through fast recovery (for example, the RLC of signaling radio bearer (SRB) 1 has reached the maximum number of retransmissions, and the RRC reconfiguration complete message cannot be sent on the target cell). Alternatively, even if the target cell is successfully switched to, normal data transmission is not possible (for example, the RLC of data radio bearer (DRB) has reached the maximum number of retransmissions).

[0107] Based on the above technical problems, the embodiments of the present application provide a wireless communication method, apparatus and device, which can solve the problem that the corresponding RLC entity cannot continue data transmission after the RLC reaches the maximum number of retransmissions and triggers RLF.

[0108] To facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions of the present application are described in detail below through specific embodiments. The above related technologies can be combined arbitrarily with the technical solutions of the embodiments of the present application as optional solutions, and all of them fall within the scope of protection of the embodiments of the present application. The embodiments of the present application include at least part of the following contents.

[0109] Figure 4 is a schematic flow chart of a wireless communication method 200 according to an embodiment of the present application, such as Figure 4 As shown, the wireless communication method 200 may include at least part of the following contents:

[0110] S210, if RLF is detected, the terminal performs cell selection;

[0111] S220, if the detected RLF is triggered by RLC reaching the maximum number of retransmissions, and the selected cell is an LTM candidate cell, the terminal performs a first operation; wherein the first operation includes one of the following: sending an RRC reestablishment request in the selected cell, performing handover for the selected cell, resetting the RLC retransmission counter, performing RLC reestablishment or PDCP data recovery of AM DRB.

[0112] It should be understood that Figure 4 The steps or operations of the wireless communication method 200 are shown, but these steps or operations are only examples. The present application may also perform other operations or Figure 4 Variations of the various operations in .

[0113] In some embodiments, the present invention may be applicable to at least one of the following:

[0114] Intra-DU handover scenario, inter-DU handover scenario, intra-CU handover scenario, and inter-CU handover scenario.

[0115] In some embodiments, the switching described in the embodiments of the present application may include switching indicated by a layer 3 (L3) switching command, LTM switching, conditional handover (CHO), primary and secondary cell change (PSCellchange), conditional primary and secondary cell change (Condition PSCell Change) or other types of switching.

[0116] In some embodiments, the fast recovery described in the embodiments of the present application can be LTM fast recovery, CHO fast recovery, or other fast recovery that achieves similar functions.

[0117] In some embodiments, resetting the RLC retransmission counter described in the embodiments of the present application may be resetting the RLC retransmission counter to a specific value, for example, the specific value is 0.

[0118] In some embodiments, before the terminal performs the first operation, the wireless communication method 200 further includes:

[0119] The terminal receives configuration information from a network-side device; wherein the configuration information includes at least one of the following:

[0120] A first identifier associated with the serving cell, at least one LTM candidate cell, a second identifier associated with each LTM candidate cell in the at least one LTM candidate cell, a third identifier associated with the serving cell, a fourth identifier associated with each LTM candidate cell in the at least one LTM candidate cell, an indication allowing fast recovery, and an indication allowing execution of the first operation.

[0121] Exemplarily, the first identifier and the second identifier may be identifiers corresponding to the DU, and the third identifier and the fourth identifier may be identifiers corresponding to the CU.

[0122] In an embodiment of the present application, when the fourth identifier associated with the selected cell is the same as the third identifier associated with the service cell, the terminal does not perform PDCP reconstruction; when the fourth identifier associated with the selected cell is different from the third identifier associated with the service cell, the terminal performs PDCP reconstruction.

[0123] The configuration information described in the embodiment of the present application may be an LTM configuration. It should be understood that the configuration information may also be other configurations, and the embodiment of the present application is not limited thereto.

[0124] In some embodiments, the selected cell sends an RRC re-establishment request. In the above S220, the terminal performs the first operation including: if the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, the terminal sends an RRC re-establishment request in the selected cell.

[0125] In some embodiments, the selected cell sends an RRC re-establishment request. In the above S220, the terminal performs the first operation including: if the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, the terminal sends an RRC re-establishment request in the selected cell.

[0126] In some embodiments, the first operation includes performing RLC reconstruction or PDCP data recovery of AM DRB. In the above S220, the terminal performs the first operation including: if the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when performing switching for the selected cell, the terminal performs RLC reconstruction or PDCP data recovery of AM DRB.

[0127] In some embodiments, the first operation includes performing RLC reconstruction or PDCP data recovery of AM DRB. In the above S220, the terminal performs the first operation including: if the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when switching is performed for the selected cell, the terminal performs RLC reconstruction or PDCP data recovery of AM DRB.

[0128] In some embodiments, the first operation includes resetting the RLC retransmission counter. In the above S220, the terminal performs the first operation including: if the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when performing switching for the selected cell, the terminal resets the RLC retransmission counter.

[0129] In some embodiments, the first operation includes resetting the RLC retransmission counter. In the above S220, the terminal performs the first operation including: if the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when performing switching for the selected cell, the terminal resets the RLC retransmission counter.

[0130] In some embodiments, the first operation includes performing handover on the selected cell. In the above S220, the terminal performs the first operation including: if the second identifier associated with the selected cell is different from the first identifier associated with the serving cell, the terminal performs handover on the selected cell.

[0131] In some embodiments, the first operation includes performing handover for the selected cell. In the above S220, the terminal performs the first operation including: if the fourth identifier associated with the selected cell is different from the third identifier associated with the serving cell, the terminal performs handover for the selected cell.

[0132] In some embodiments, the first operation includes performing switching for the selected cell. In the above S220, the terminal performs the first operation including: if the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is different from the first identifier associated with the serving cell, the terminal performs switching for the selected cell.

[0133] The first identifier described in the embodiment of the present application can be the ltm-ServingCellNoResetID configured for the serving cell, and the second identifier described in the embodiment of the present application can be the ltm-NoResetID configured for the LTM candidate cell. It should be understood that the first identifier and the second identifier can also be other identifiers, and the embodiment of the present application is not limited to this.

[0134] The first identifier and the second identifier described in the embodiment of the present application can be understood as DU identifiers, which are used to determine whether the serving cell and the LTM candidate cell are in the same DU.

[0135] Exemplarily, when the second identifier (such as ltm-NoResetID) associated with an LTM candidate cell is the same as the first identifier (such as ltm-ServingCellNoResetID) associated with the serving cell, the LTM candidate cell and the serving cell are intra-DU.

[0136] Exemplarily, when the second identifier (such as ltm-NoResetID) associated with an LTM candidate cell is different from the first identifier (such as ltm-ServingCellNoResetID) associated with the serving cell, the LTM candidate cell and the serving cell are inter-DU.

[0137] The third identifier and the fourth identifier described in the embodiment of the present application can be understood as CU identifiers, which are used to determine whether the serving cell and the LTM candidate cell are in the same CU. For example, in inter-CU, the network-side device configures the third identifier for the serving cell and the associated fourth identifier for each LTM candidate cell.

[0138] Specifically, when the third identifier and the fourth identifier are configured, the terminal first determines whether the third identifier and the fourth identifier are the same, and then determines whether the second identifier and the first identifier are the same.

[0139] For example, when the third identifier associated with the service cell and the fourth identifier associated with the LTM candidate cell are the same, the terminal further determines whether the first identifier associated with the service cell and the second identifier associated with the LTM candidate cell are the same; if the first identifier associated with the service cell and the second identifier associated with the LTM candidate cell are the same, intra-CU, intra-DU switching is performed; if the first identifier associated with the service cell and the second identifier associated with the LTM candidate cell are different, intra-CU, inter-DU switching is performed.

[0140] For another example, when the third identifier associated with the serving cell and the fourth identifier associated with the LTM candidate cell are different, inter-CU handover is performed, and RLC reestablishment and PDCP reestablishment need to be performed.

[0141] The RLC retransmission counter described in the embodiment of the present application may be RETX_COUNT.

[0142] The LTM fast recovery described in the embodiment of the present application may be an attempt LTM-Switch.

[0143] In some implementations, if the selected cell is an LTM candidate cell, and the second identifier (such as ltm-NoResetID) associated with the selected cell is the same as the first identifier (such as ltm-ServingCellNoResetID) (that is, the selected cell is an intra-DU cell), an RRC re-establishment request is sent in the selected cell. That is, in this embodiment, the terminal does not perform cell switching or fast recovery on the selected cell (that is, the intra-DU cell), but directly sends an RRC re-establishment request (that is, directly performs RRC re-establishment), avoiding handover failure caused by the RLC retransmission counter reaching the maximum value in this scenario, or avoiding the problem of data transmission failure after switching to the intra-DU cell, so that data transmission can continue in the intra-DU cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission.

[0144] In some implementations, if the selected cell is an LTM candidate cell and the second identifier (e.g., ltm-NoResetID) associated with the selected cell is different from the first identifier (e.g., ltm-ServingCellNoResetID) (i.e., the selected cell is an inter-DU cell), handover (i.e., fast recovery) is performed on the selected cell. That is, in this embodiment, the terminal performs fast recovery on the selected cell (i.e., the inter-DU cell). During the fast recovery process on the inter-DU cell, RLC re-establishment is performed, thereby enabling data transmission to continue in the inter-DU cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission.

[0145] In some implementations, an RRC re-establishment request is sent in a selected cell. In this embodiment, the selected cell may or may not be an LTM candidate cell. In this embodiment, the terminal does not perform fast recovery or cell handover on the selected cell but instead directly sends an RRC re-establishment request. Sending the RRC re-establishment request in the selected cell avoids handover failures caused by the RLC retransmission counter reaching its maximum value in this scenario, or avoids the problem of data transmission failure after handover. Data transmission can thus continue in the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission.

[0146] In some implementations, if the selected cell is an LTM candidate cell, and the second identifier (e.g., ltm-NoResetID) associated with the selected cell is the same as the first identifier (e.g., ltm-ServingCellNoResetID) (i.e., the selected cell is an intra-DU cell), when handover (i.e., fast recovery) is performed on the selected cell, RLC re-establishment or PDCP data recovery (data recovery) of the AM DRB is performed. That is, in this embodiment, the terminal performs fast recovery on the selected cell (i.e., the intra-DU cell), and when handover is performed on the selected cell (i.e., the intra-DU cell), RLC re-establishment or PDCP data recovery of the AM DRB is performed, thereby avoiding handover failure caused by the RLC retransmission counter reaching the maximum value in this scenario, or avoiding the problem of data transmission failure after handover to the intra-DU cell. Therefore, data transmission can continue in the intra-DU cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission.

[0147] In some implementations, if the selected cell is an LTM candidate cell, and the second identifier (e.g., ltm-NoResetID) associated with the selected cell is the same as the first identifier (e.g., ltm-ServingCellNoResetID) (i.e., the selected cell is an intra-DU cell), the RLC retransmission count counter is reset when handover (i.e., fast recovery) is performed on the selected cell. That is, in this embodiment, the terminal performs fast recovery on the selected cell (i.e., intra-DU cell), and when handover is performed on the selected cell (i.e., intra-DU cell), the RLC retransmission count counter is reset, thereby avoiding handover failure caused by the RLC retransmission count reaching the maximum value in this scenario, or avoiding the problem of data transmission failure after handover to the intra-DU cell, thereby allowing data transmission to continue in the intra-DU cell, ensuring that the RLC entity that has reached the maximum retransmission count can continue data transmission.

[0148] In some implementations, if the selected cell is an LTM candidate cell, and the fourth identifier associated with the selected cell is the same as the third identifier, and the second identifier associated with the selected cell is the same as the first identifier (i.e., intra-CU, intra-DU switching is performed), an RRC re-establishment request is sent in the selected cell. That is, in this embodiment, the terminal does not perform fast recovery or cell switching on the selected cell (i.e., intra-DU cell), and does not perform cell switching or fast recovery on the selected cell (i.e., intra-DU cell) but directly sends an RRC re-establishment request (i.e., directly performs RRC re-establishment), thereby avoiding the switching failure caused by the RLC retransmission counter reaching the maximum value in this scenario, or avoiding the problem of data transmission still not being able to be performed after switching to the intra-DU cell, so that data transmission can continue in the intra-DU cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission.

[0149] In some implementations, if the selected cell is an LTM candidate cell and the fourth identifier associated with the selected cell is different from the third identifier (i.e., inter-CU handover is being performed), handover (i.e., fast recovery) is performed on the selected cell. That is, in this embodiment, during inter-CU handover, the terminal performs fast recovery on the selected cell, and during the fast recovery process, RLC reestablishment is performed, so that data transmission can continue in the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission.

[0150] In some implementations, if the selected cell is an LTM candidate cell, and the fourth identifier associated with the selected cell is the same as the third identifier, and the second identifier associated with the selected cell is different from the first identifier (i.e., intra-CU, inter-DU switching is performed), switching (i.e., fast recovery) is performed on the selected cell. That is, in this embodiment, the terminal performs fast recovery on the selected cell (i.e., inter-DU cell), and performs RLC reconstruction during the fast recovery process, so that data transmission can continue in the inter-DU cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission.

[0151] In some implementations, if the selected cell is an LTM candidate cell, and the fourth identifier associated with the selected cell is the same as the third identifier, and the second identifier associated with the selected cell is the same as the first identifier (i.e., intra-CU, intra-DU handover is performed), when handover (i.e., fast recovery) is performed on the selected cell, RLC re-establishment or PDCP data recovery of the AM DRB is performed. That is, in this embodiment, the terminal performs fast recovery on the selected cell (i.e., intra-DU cell), and when handover is performed on the selected cell (i.e., intra-DU cell), RLC re-establishment or PDCP data recovery of the AM DRB is performed, thereby avoiding handover failure caused by the RLC retransmission counter reaching the maximum value in this scenario, or avoiding the problem of data transmission failure after handover to the intra-DU cell, so that data transmission can continue in the intra-DU cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission.

[0152] In some implementations, if the selected cell is an LTM candidate cell, and the fourth identifier associated with the selected cell is the same as the third identifier, and the second identifier associated with the selected cell is the same as the first identifier (i.e., intra-CU, intra-DU switching is performed), when switching is performed on the selected cell (i.e., fast recovery), the RLC retransmission count counter is reset to 0 (i.e., the RLC retransmission count counter is reset). That is, in this embodiment, the terminal performs fast recovery on the selected cell (i.e., intra-DU cell), and when switching is performed on the selected cell (i.e., intra-DU cell), the RLC retransmission count counter is reset, thereby avoiding switching failure caused by the RLC retransmission count reaching the maximum value in this scenario, or avoiding the problem of data transmission failure after switching to the intra-DU cell, so that data transmission can continue in the intra-DU cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission.

[0153] In some embodiments, the terminal may further perform at least one of the following operations:

[0154] Perform cell selection, and if the selected cell is not an LTM candidate cell, send an RRC re-establishment request in the selected cell;

[0155] performing cell selection, and if the selected cell is an LTM candidate cell and the second identifier associated with the selected cell is different from the first identifier, performing RLC reestablishment or PDCP data recovery of the AM DRB when performing handover for the selected cell;

[0156] performing cell selection, and if the selected cell is an LTM candidate cell and the second identifier associated with the selected cell is different from the first identifier, resetting an RLC retransmission count counter when performing handover for the selected cell;

[0157] performing cell selection, and if the selected cell is an LTM candidate cell, and the fourth identifier associated with the selected cell is the same as the third identifier, and the second identifier associated with the selected cell is different from the first identifier, performing RLC re-establishment or PDCP data recovery of the AM DRB when performing handover for the selected cell;

[0158] Perform cell selection. If the selected cell is an LTM candidate cell, and the fourth identifier associated with the selected cell is the same as the third identifier, and the second identifier associated with the selected cell is different from the first identifier, when switching is performed for the selected cell, reset the RLC retransmission count counter.

[0159] In some embodiments, when the first operation includes performing RLC re-establishment or PDCP data recovery of AM DRB, the first operation is applicable to at least one of the following: an RLC entity that has reached the maximum number of retransmissions, and a PDCP entity associated with the RLC entity that has reached the maximum number of retransmissions.

[0160] For example, RLC re-establishment is applicable to an RLC entity that has reached the maximum number of retransmissions, and PDCP data recovery of an AM DRB is applicable to a PDCP entity associated with an RLC entity that has reached the maximum number of retransmissions.

[0161] In some embodiments, in case the first operation includes resetting an RLC retransmission number counter, the first operation is applicable to an RLC entity that has reached a maximum retransmission number.

[0162] In some embodiments, when the first operation includes performing RLC re-establishment or PDCP data recovery of an AM DRB or resetting an RLC retransmission count counter, the wireless communication method 200 further includes:

[0163] The terminal sends first indication information to the network side device;

[0164] The first indication information is used to indicate that the terminal has performed RLC reconstruction or PDCP data recovery of AMDRB or reset the RLC retransmission count counter when performing handover.

[0165] Exemplarily, in a case where the first operation includes performing RLC re-establishment, the first indication information is used to indicate that the terminal has performed RLC re-establishment when performing handover.

[0166] Exemplarily, when the first operation includes performing RLC reestablishment, the first indication information is used to indicate that the terminal has performed RLC reestablishment and PDCP data recovery for AM DRBs when performing handover. It should be understood that in this example, when performing RLC reestablishment, PDCP data recovery for AM DRBs is also performed by default.

[0167] Exemplarily, in a case where the first operation includes performing PDCP data recovery of an AM DRB, the first indication information is used to indicate that the terminal has performed PDCP data recovery of the AM DRB when performing handover.

[0168] Exemplarily, when the first operation includes performing PDCP data recovery for an AM DRB, the first indication information is used to indicate that the terminal has performed RLC re-establishment and PDCP data recovery for the AM DRB when performing handover. It should be understood that in this example, when performing PDCP data recovery for the AM DRB, RLC re-establishment is also performed by default.

[0169] Exemplarily, in a case where the first operation includes resetting an RLC retransmission count counter, the first indication information is used to instruct the terminal to reset the RLC retransmission count counter when performing handover.

[0170] In some embodiments, the first indication information occupies at least one bit in a first Media Access Control Control Element (MAC CE).

[0171] Exemplarily, the first MAC CE contains 1 bit, wherein a value of 0 indicates that the terminal performs RLC reconstruction or PDCP data recovery of AM DRB or resets the RLC retransmission counter when performing switching, or a value of 1 indicates that the terminal performs RLC reconstruction or PDCP data recovery of AM DRB or resets the RLC retransmission counter when performing switching.

[0172] In some embodiments, the first indication information is represented by a specific MAC subheader. Specifically, for example, when the specific MAC subheader appears, it indicates that the terminal has performed RLC reestablishment or PDCP data recovery of AM DRB or reset the RLC retransmission count counter when performing handover.

[0173] In some embodiments, the first indication information is represented by a second MAC CE, and the second MAC CE includes but is not limited to at least one of the following:

[0174] At least one bit, used to indicate that the terminal has performed RLC re-establishment or PDCP data recovery of an AM DRB or reset an RLC retransmission count counter when performing a handover;

[0175] RB type information corresponding to the radio bearer (RB) for which RLC re-establishment or PDCP data recovery of AM DRB is performed;

[0176] Identification information of the RB for which RLC re-establishment or PDCP data recovery of AM DRB is performed;

[0177] RB type information corresponding to the RB for which the RLC retransmission counter is reset;

[0178] Identification information of the RB for which the RLC retransmission counter is reset.

[0179] For example, the RB that performs RLC reconstruction may be the RB corresponding to the RLC entity that performs RLC reconstruction, the RB that performs PDCP data recovery of AM DRB may be the RB corresponding to the PDCP entity that performs PDCP data recovery of AM DRB, and the RB that performs RLC retransmission counter reset may be the RB corresponding to the RLC entity that performs RLC retransmission counter reset.

[0180] Optionally, the RB type may be SRB or DRB.

[0181] Optionally, the RB identifier may be SRB-Identity or DRB-Identity.

[0182] For example, when only some RLC entities perform RLC reconstruction and / or some PDCP entities perform PDCP data recovery, the second MAC CE may include the RB type (for example, 1 bit indicating SRB or DRB) and RB identifier (for example, including SRB-Identity or DRB-Identity) corresponding to the RB that performed RLC reconstruction and / or PDCP data recovery.

[0183] In some embodiments, the first indication information is carried by at least one of the following:

[0184] Message 3 (Msg 3) in four-step random access (4-step RACH);

[0185] Message A (Msg A) in two-step random access (2-step RACH);

[0186] Media Access Control Protocol Data Unit (MAC PDU) containing the RRC reconfiguration complete message;

[0187] The MAC PDU before the MAC PDU containing the RRC reconfiguration complete message.

[0188] In some embodiments, before the terminal performs the first operation, the wireless communication method 200 further includes:

[0189] The terminal receives second indication information from the network side device;

[0190] The second indication information is used to indicate that the terminal is allowed to perform the first operation.

[0191] In some embodiments, a protocol stipulates that the terminal is allowed to perform the first operation.

[0192] Therefore, in an embodiment of the present application, if RLF is triggered by RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal sends an RRC re-establishment request in the selected cell, and does not perform cell switching or fast recovery in the selected cell but directly sends an RRC re-establishment request. This can avoid switching failures caused by the RLC retransmission counter reaching the maximum value, or avoid the problem of still being unable to perform data transmission after switching to the intra-DU cell, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue to perform data transmission, and can also solve the problem that the corresponding RLC entity cannot continue to perform data transmission after the RLC reaches the maximum number of retransmissions to trigger RLF.

[0193] Alternatively, if the RLF is triggered by the RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal performs switching for the selected cell and performs RLC reconstruction during the rapid recovery process, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission. It can also solve the problem that the corresponding RLC entity cannot continue data transmission after the RLC reaches the maximum number of retransmissions and triggers RLF.

[0194] Alternatively, if the RLF is triggered by the RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal resets the RLC retransmission counter to avoid handover failure caused by the RLC retransmission counter reaching the maximum value, or to avoid the problem of data transmission still not being able to be performed after the handover, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission, and can also solve the problem that the corresponding RLC entity cannot continue data transmission after the RLC reaches the maximum number of retransmissions to trigger RLF.

[0195] Alternatively, if the RLF is triggered by RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal performs RLC reconstruction or PDCP data recovery of the AM DRB to avoid handover failure caused by the RLC retransmission counter reaching the maximum value, or to avoid the problem of data transmission still not being able to be performed after the handover, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission, and can also solve the problem that the corresponding RLC entity cannot continue data transmission after the RLC reaches the maximum number of retransmissions to trigger RLF.

[0196] It should be understood that the above Figure 4 The wireless communication method 200 of the embodiment of the present application is described from the terminal side. Figure 5 The wireless communication method 300 of an embodiment of the present application is described from the network side. The description of the network side can refer to the relevant description of the terminal side mentioned above and will not be repeated here.

[0197] Figure 5 is a schematic flow chart of a wireless communication method 300 according to an embodiment of the present application, such as Figure 5 As shown, the wireless communication method 300 may include at least part of the following contents:

[0198] S310, the network side device sends second indication information to the terminal;

[0199] The second indication information is used to indicate that if the RLF is triggered by the RLC reaching a maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal is allowed to perform the first operation;

[0200] The first operation includes one of the following:

[0201] An RRC re-establishment request is sent in the selected cell, a handover is performed for the selected cell, an RLC retransmission count counter is reset, and RLC re-establishment or PDCP data recovery of an AM DRB is performed.

[0202] It should be understood that Figure 5The steps or operations of the wireless communication method 300 are shown, but these steps or operations are only examples. The present application may also perform other operations or Figure 5 Variations of the various operations in .

[0203] In some embodiments, the present invention may be applicable to at least one of the following:

[0204] Intra-DU handover scenario, inter-DU handover scenario, intra-CU handover scenario, and inter-CU handover scenario.

[0205] In some embodiments, the switching described in the embodiments of the present application may include switching indicated by a layer 3 (L3) switching command, LTM switching, conditional handover (CHO), primary and secondary cell change (PSCellchange), conditional primary and secondary cell change (Condition PSCell Change) or other types of switching.

[0206] In some embodiments, the fast recovery described in the embodiments of the present application can be LTM fast recovery, CHO fast recovery, or other fast recovery that achieves similar functions.

[0207] In some embodiments, resetting the RLC retransmission counter described in the embodiments of the present application may be resetting the RLC retransmission counter to a specific value, for example, the specific value is 0.

[0208] In some embodiments, if the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, the first operation includes sending an RRC re-establishment request in the selected cell; or

[0209] If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, the first operation includes sending an RRC re-establishment request in the selected cell.

[0210] In some embodiments, if the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when performing handover for the selected cell, the first operation includes performing RLC re-establishment or PDCP data recovery of AM DRB; or

[0211] If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when switching is performed for the selected cell, the first operation includes performing RLC reconstruction or PDCP data recovery of AM DRB.

[0212] In some embodiments, if the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when performing handover for the selected cell, the first operation includes resetting the RLC retransmission count counter; or

[0213] If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when switching is performed on the selected cell, the first operation includes resetting the RLC retransmission count counter.

[0214] In some embodiments, if the second identifier associated with the selected cell is different from the first identifier associated with the serving cell, the first operation includes performing a handover on the selected cell; or

[0215] If the fourth identifier associated with the selected cell is different from the third identifier associated with the serving cell, the first operation includes performing handover on the selected cell; or

[0216] If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is different from the first identifier associated with the serving cell, the first operation includes performing handover on the selected cell.

[0217] In some embodiments, when the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, the terminal does not perform PDCP reconstruction; when the fourth identifier associated with the selected cell is different from the third identifier associated with the serving cell, the terminal performs PDCP reconstruction.

[0218] In some embodiments, the wireless communication method 300 further includes:

[0219] The network side device sends configuration information to the terminal;

[0220] The configuration information includes at least one of the following: a first identifier associated with the service cell, at least one LTM candidate cell, a second identifier associated with each LTM candidate cell in the at least one LTM candidate cell, a third identifier associated with the service cell, a fourth identifier associated with each LTM candidate cell in the at least one LTM candidate cell, an indication allowing fast recovery, and an indication allowing execution of the first operation.

[0221] In some embodiments, where the first operation includes performing RLC re-establishment or PDCP data recovery of an AM DRB, the first operation is applicable to at least one of: an RLC entity that has reached a maximum number of retransmissions, a PDCP entity associated with the RLC entity that has reached a maximum number of retransmissions; or

[0222] In case that the first operation includes resetting an RLC retransmission number counter, the first operation is applicable to an RLC entity that has reached a maximum retransmission number.

[0223] In some embodiments, when the first operation includes performing RLC re-establishment or PDCP data recovery of an AM DRB or resetting an RLC retransmission count counter, the method 300 further includes:

[0224] The network side device receives first indication information from the terminal;

[0225] The first indication information is used to indicate that the terminal has performed RLC reconstruction or PDCP data recovery of AMDRB or reset the RLC retransmission count counter when performing handover.

[0226] In some embodiments, the first indication information occupies at least one bit in a first media access control layer control element MAC CE, or the first indication information is represented by a specific media access control MAC subheader.

[0227] In some embodiments, the first indication information is represented by a second MAC CE, and the second MAC CE includes at least one of the following:

[0228] At least one bit, used to indicate that the terminal has performed RLC re-establishment or PDCP data recovery of an AM DRB or reset an RLC retransmission count counter when performing a handover;

[0229] RB type information corresponding to the radio bearer RB for which RLC re-establishment or PDCP data recovery of AM DRB is performed;

[0230] Identification information of the RB for which RLC re-establishment or PDCP data recovery of AM DRB is performed;

[0231] RB type information corresponding to the RB for which the RLC retransmission counter is reset;

[0232] Identification information of the RB for which the RLC retransmission counter is reset.

[0233] In some embodiments, the indication information is carried by at least one of the following:

[0234] Message 3 in four-step random access;

[0235] Message A in two-step random access;

[0236] The media access control protocol data unit MAC PDU where the RRC reconfiguration complete message is located;

[0237] The MAC PDU before the MAC PDU containing the RRC reconfiguration complete message.

[0238] Therefore, in an embodiment of the present application, if RLF is triggered by RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal sends an RRC re-establishment request in the selected cell, and does not perform cell switching or fast recovery in the selected cell but directly sends an RRC re-establishment request. This can avoid switching failures caused by the RLC retransmission counter reaching the maximum value, or avoid the problem of still being unable to perform data transmission after switching to the intra-DU cell, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue to perform data transmission, and can also solve the problem that the corresponding RLC entity cannot continue to perform data transmission after the RLC reaches the maximum number of retransmissions to trigger RLF.

[0239] Alternatively, if the RLF is triggered by the RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal performs switching for the selected cell and performs RLC reconstruction during the rapid recovery process, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission. It can also solve the problem that the corresponding RLC entity cannot continue data transmission after the RLC reaches the maximum number of retransmissions and triggers RLF.

[0240] Alternatively, if the RLF is triggered by the RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal resets the RLC retransmission counter to avoid handover failure caused by the RLC retransmission counter reaching the maximum value, or to avoid the problem of data transmission still not being able to be performed after the handover, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission, and can also solve the problem that the corresponding RLC entity cannot continue data transmission after the RLC reaches the maximum number of retransmissions to trigger RLF.

[0241] Alternatively, if the RLF is triggered by RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal performs RLC reconstruction or PDCP data recovery of the AM DRB to avoid handover failure caused by the RLC retransmission counter reaching the maximum value, or to avoid the problem of data transmission still not being able to be performed after the handover, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission, and can also solve the problem that the corresponding RLC entity cannot continue data transmission after the RLC reaches the maximum number of retransmissions to trigger RLF.

[0242] At present, RLC reconstruction may not be performed during the handover process. In this case, the count value of the RLC retransmission counter remains unchanged. Therefore, even if the terminal switches to a target cell that is better than the source cell, the number of RLC retransmissions that the terminal can perform is limited. This may cause the terminal to quickly reach the maximum number of RLC retransmissions in the new cell, thereby triggering RLF and failing to meet the transmission reliability requirements.

[0243] Based on the above technical problems, this application proposes a wireless communication solution, in which the terminal resets the RLC retransmission counter when performing a handover, or, if RLF or handover failure is detected, the terminal resets the RLC retransmission counter when performing a fast recovery, thereby improving the data transmission reliability after the handover. The specific solution can be as follows Figure 6 shown.

[0244] Figure 6 is a schematic flow chart of a wireless communication method 400 according to an embodiment of the present application, such as Figure 6 As shown, the wireless communication method 400 may include at least part of the following contents:

[0245] S410, the terminal resets the RLC retransmission counter when performing handover; or, if RLF or handover failure is detected, the terminal resets the RLC retransmission counter when performing fast recovery.

[0246] It should be understood that Figure 6 The steps or operations of the wireless communication method 400 are shown, but these steps or operations are only examples. The present application may also perform other operations or Figure 6 Variations of the various operations in .

[0247] In some embodiments, the present invention may be applicable to at least one of the following:

[0248] Intra-DU handover scenario, inter-DU handover scenario, intra-CU handover scenario, and inter-CU handover scenario.

[0249] In some embodiments, the switching described in the embodiments of the present application may include switching indicated by a layer 3 (L3) switching command, LTM switching, conditional switching (CHO), primary and secondary cell change (PSCell change), conditional primary and secondary cell change (Condition PSCell Change) or other types of switching.

[0250] In some embodiments, the fast recovery described in the embodiments of the present application can be LTM fast recovery, CHO fast recovery, or other fast recovery that achieves similar functions.

[0251] In some embodiments, resetting the RLC retransmission counter described in the embodiments of the present application may be resetting the RLC retransmission counter to a specific value, for example, the specific value is 0.

[0252] In some implementations, the terminal resets the RLC retransmission counter when performing a handover, so that the RLC retransmission counter can better match the cell after the handover, thereby improving the data transmission reliability after the handover.

[0253] In some implementations, if RLF or handover failure is detected, the terminal resets the RLC retransmission counter when performing fast recovery, thereby avoiding handover failure caused by the RLC retransmission counter reaching the maximum value, or avoiding the problem of still being unable to perform data transmission after switching to the intra-DU cell, and ensuring that the UE continues to perform data transmission after fast recovery.

[0254] Therefore, in an embodiment of the present application, the terminal resets the RLC retransmission counter when performing a handover, thereby enabling the RLC retransmission counter to better match the cell after the handover, thereby improving the data transmission reliability after the handover. Alternatively, if an RLF or handover failure is detected, the terminal resets the RLC retransmission counter when performing a fast recovery, ensuring that the terminal can send an RRC reconfiguration complete message or other data information on the target cell, thereby quickly switching to the target cell and improving the data transmission reliability of the target cell.

[0255] The wireless communication method provided in the embodiments of the present application may be performed by a wireless communication device or a processing unit in the wireless communication device for performing the wireless communication method. The embodiments of the present application take the wireless communication device performing the wireless communication method as an example to illustrate the wireless communication device provided in the embodiments of the present application.

[0256] Figure 7 FIG. 5 shows a schematic block diagram of a wireless communication device 500 according to an embodiment of the present application. Figure 7 As shown, the wireless communication device 500 includes: a processing unit 510;

[0257] If a radio link failure (RLF) is detected, the processing unit 510 is configured to perform cell selection;

[0258] If the detected RLF is triggered by the radio link control RLC reaching the maximum number of retransmissions, and the selected cell is a layer 1 / layer 2 triggered mobility LTM candidate cell, the processing unit 510 is further configured to perform a first operation;

[0259] The first operation includes one of the following: sending a radio resource control RRC re-establishment request in the selected cell, performing handover for the selected cell, resetting an RLC retransmission counter, performing RLC re-establishment or packet data convergence protocol PDCP data recovery of an acknowledgement mode AM data radio bearer DRB.

[0260] In some embodiments, the first operation includes sending an RRC re-establishment request in the selected cell, and the processing unit is specifically configured to:

[0261] If the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, controlling the wireless communication device 500 to send an RRC reestablishment request to the selected cell; or

[0262] If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, control the wireless communication device 500 to send an RRC re-establishment request in the selected cell.

[0263] In some embodiments, the first operation includes performing RLC reestablishment or PDCP data recovery of AM DRBs, and the processing unit 510 is specifically configured to:

[0264] If the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, performing RLC re-establishment or PDCP data recovery of the AM DRB when performing handover for the selected cell; or

[0265] If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when switching is performed for the selected cell, RLC reconstruction or PDCP data recovery of AM DRB is performed.

[0266] In some embodiments, the first operation includes resetting the RLC retransmission count counter, and the processing unit 510 is specifically configured to:

[0267] If the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when performing handover for the selected cell, resetting the RLC retransmission count counter; or,

[0268] If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, the RLC retransmission count counter is reset when switching is performed on the selected cell.

[0269] In some embodiments, the first operation includes performing handover on the selected cell, and the processing unit 510 is specifically configured to:

[0270] If the second identifier associated with the selected cell is different from the first identifier associated with the serving cell, performing handover for the selected cell; or

[0271] If the fourth identifier associated with the selected cell is different from the third identifier associated with the serving cell, performing handover on the selected cell; or,

[0272] If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is different from the first identifier associated with the serving cell, handover is performed on the selected cell.

[0273] In some embodiments, before the wireless communication device 500 performs the first operation, the wireless communication device 500 further includes:

[0274] The transceiver unit 520 is configured to receive configuration information from a network-side device;

[0275] The configuration information includes at least one of the following:

[0276] The first identifier associated with the service cell, at least one LTM candidate cell, the second identifier associated with each LTM candidate cell in the at least one LTM candidate cell, the third identifier associated with the service cell, the fourth identifier associated with each LTM candidate cell in the at least one LTM candidate cell, an indication allowing fast recovery, and an indication allowing execution of the first operation.

[0277] In some embodiments, where the first operation includes performing RLC re-establishment or PDCP data recovery of an AM DRB, the first operation is applicable to at least one of: an RLC entity that has reached a maximum number of retransmissions, a PDCP entity associated with the RLC entity that has reached a maximum number of retransmissions; or

[0278] In case that the first operation includes resetting an RLC retransmission number counter, the first operation is applicable to an RLC entity that has reached a maximum retransmission number.

[0279] In some embodiments, when the first operation includes performing RLC re-establishment or PDCP data recovery of an AM DRB or resetting an RLC retransmission count counter, the wireless communication apparatus further includes:

[0280] The transceiver unit 520 is configured to send first indication information to the network side device;

[0281] The first indication information is used to indicate that the wireless communication apparatus 500 has performed RLC re-establishment or PDCP data recovery of AM DRB or reset the RLC retransmission count counter when performing handover.

[0282] In some embodiments, the first indication information occupies at least one bit in a first media access control layer control element MAC CE, or the first indication information is represented by a specific media access control MAC subheader.

[0283] In some embodiments, the first indication information is represented by a second MAC CE, and the second MAC CE includes at least one of the following:

[0284] At least one bit, used to indicate that the wireless communication apparatus 500 performs RLC re-establishment or PDCP data recovery of an AMDRB or resets an RLC retransmission count counter when performing a handover;

[0285] RB type information corresponding to the radio bearer RB for which RLC re-establishment or PDCP data recovery of AM DRB is performed;

[0286] Identification information of the RB for which RLC re-establishment or PDCP data recovery of AM DRB is performed;

[0287] RB type information corresponding to the RB for which the RLC retransmission counter is reset;

[0288] Identification information of the RB for which the RLC retransmission counter is reset.

[0289] In some embodiments, the first indication information is carried by at least one of the following:

[0290] Message 3 in four-step random access;

[0291] Message A in two-step random access;

[0292] The media access control protocol data unit MAC PDU where the RRC reconfiguration complete message is located;

[0293] The MAC PDU before the MAC PDU containing the RRC reconfiguration complete message.

[0294] In some embodiments, before the wireless communication device 500 performs the first operation, the wireless communication device 500 further includes:

[0295] The transceiver unit 520 is configured to receive second indication information from a network-side device;

[0296] The second indication information is used to indicate that if the RLF is triggered by the RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the wireless communication device 500 is allowed to perform the first operation.

[0297] In some embodiments, the transceiver unit 520 may be a communication interface or transceiver, or an input / output interface of a communication chip or a system on chip. The processing unit 510 may be embedded in or independent of a processor of the terminal in the form of hardware.

[0298] It should be understood that the wireless communication device 500 according to the embodiment of the present application may correspond to the terminal in the method embodiment of the present application, and the various units in the wireless communication device 500 are respectively for implementing Figure 4 For the sake of brevity, the corresponding process of the terminal in the method 200 is not repeated here.

[0299] Therefore, in an embodiment of the present application, if RLF is triggered by RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal sends an RRC re-establishment request in the selected cell, and does not perform cell switching or fast recovery in the selected cell but directly sends an RRC re-establishment request. This can avoid switching failures caused by the RLC retransmission counter reaching the maximum value, or avoid the problem of still being unable to perform data transmission after switching to the intra-DU cell, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue to perform data transmission, and can also solve the problem that the corresponding RLC entity cannot continue to perform data transmission after the RLC reaches the maximum number of retransmissions to trigger RLF.

[0300] Alternatively, if the RLF is triggered by the RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal performs switching for the selected cell and performs RLC reconstruction during the rapid recovery process, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission. It can also solve the problem that the corresponding RLC entity cannot continue data transmission after the RLC reaches the maximum number of retransmissions and triggers RLF.

[0301] Alternatively, if the RLF is triggered by the RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal resets the RLC retransmission counter to avoid handover failure caused by the RLC retransmission counter reaching the maximum value, or to avoid the problem of data transmission still not being able to be performed after the handover, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission, and can also solve the problem that the corresponding RLC entity cannot continue data transmission after the RLC reaches the maximum number of retransmissions to trigger RLF.

[0302] Alternatively, if the RLF is triggered by RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal performs RLC reconstruction or PDCP data recovery of the AM DRB to avoid handover failure caused by the RLC retransmission counter reaching the maximum value, or to avoid the problem of data transmission still not being able to be performed after the handover, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission, and can also solve the problem that the corresponding RLC entity cannot continue data transmission after the RLC reaches the maximum number of retransmissions to trigger RLF.

[0303] Figure 8 FIG. 6 shows a schematic block diagram of a wireless communication device 600 according to an embodiment of the present application. Figure 8 As shown, the wireless communication device 600 includes:

[0304] The transceiver unit 610 is configured to send second indication information to the terminal;

[0305] The second indication information is used to indicate that if the radio link failure RLF is triggered by the radio link control RLC reaching the maximum number of retransmissions and the selected cell is a mobility LTM candidate cell triggered by layer 1 / layer 2, the terminal is allowed to perform the first operation;

[0306] The first operation includes one of the following:

[0307] A radio resource control (RRC) re-establishment request is sent in the selected cell, an LTM handover is performed for the selected cell, an RLC retransmission counter is reset, and RLC re-establishment or PDCP data recovery of an acknowledged mode AM data radio bearer (DRB) is performed.

[0308] In some embodiments, if the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, the first operation includes sending an RRC re-establishment request in the selected cell; or

[0309] If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, the first operation includes sending an RRC re-establishment request in the selected cell.

[0310] In some embodiments, if the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when performing handover for the selected cell, the first operation includes performing RLC re-establishment or PDCP data recovery of AM DRB; or

[0311] If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when switching is performed for the selected cell, the first operation includes performing RLC reconstruction or PDCP data recovery of AM DRB.

[0312] In some embodiments, if the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when performing handover on the selected cell, the first operation includes resetting the RLC retransmission count counter; or,

[0313] If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when switching is performed on the selected cell, the first operation includes resetting the RLC retransmission count counter.

[0314] In some embodiments, if the second identifier associated with the selected cell is different from the first identifier associated with the serving cell, the first operation includes performing a handover on the selected cell; or

[0315] If the fourth identifier associated with the selected cell is different from the third identifier associated with the serving cell, the first operation includes performing handover on the selected cell; or

[0316] If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is different from the first identifier associated with the serving cell, the first operation includes performing handover on the selected cell.

[0317] In some embodiments, the transceiver unit 610 is further configured to send configuration information to the terminal;

[0318] The configuration information includes at least one of the following:

[0319] The first identifier associated with the service cell, at least one LTM candidate cell, the second identifier associated with each LTM candidate cell in the at least one LTM candidate cell, the third identifier associated with the service cell, the fourth identifier associated with each LTM candidate cell in the at least one LTM candidate cell, an indication allowing fast recovery, and an indication allowing execution of the first operation.

[0320] In some embodiments, where the first operation includes performing RLC re-establishment or PDCP data recovery of an AM DRB, the first operation is applicable to at least one of: an RLC entity that has reached a maximum number of retransmissions, a PDCP entity associated with the RLC entity that has reached a maximum number of retransmissions; or

[0321] In case that the first operation includes resetting an RLC retransmission number counter, the first operation is applicable to an RLC entity that has reached a maximum retransmission number.

[0322] In some embodiments, when the first operation includes performing RLC re-establishment or PDCP data recovery of an AM DRB or resetting an RLC retransmission count counter, the transceiver unit 610 is further configured to receive first indication information from the terminal;

[0323] The first indication information is used to indicate that the terminal has performed RLC reconstruction or PDCP data recovery of AMDRB or reset the RLC retransmission count counter when performing handover.

[0324] In some embodiments, the first indication information occupies at least one bit in a first media access control layer control element MAC CE, or the first indication information is represented by a specific media access control MAC subheader.

[0325] In some embodiments, the first indication information is represented by a second MAC CE, and the second MAC CE includes at least one of the following:

[0326] At least one bit, used to indicate that the terminal has performed RLC re-establishment or PDCP data recovery of an AM DRB or reset an RLC retransmission count counter when performing a handover;

[0327] RB type information corresponding to the radio bearer RB for which RLC re-establishment or PDCP data recovery of AM DRB is performed;

[0328] Identification information of the RB for which RLC re-establishment or PDCP data recovery of AM DRB is performed;

[0329] RB type information corresponding to the RB for which the RLC retransmission counter is reset;

[0330] Identification information of the RB for which the RLC retransmission counter is reset.

[0331] In some embodiments, the first indication information is carried by at least one of the following:

[0332] Message 3 in four-step random access;

[0333] Message A in two-step random access;

[0334] The media access control protocol data unit MAC PDU where the RRC reconfiguration complete message is located;

[0335] The MAC PDU before the MAC PDU containing the RRC reconfiguration complete message.

[0336] In some embodiments, the transceiver unit 610 may be a communication interface or a transceiver, or an input / output interface of a communication chip or a system on chip.

[0337] It should be understood that the wireless communication device 600 according to the embodiment of the present application may correspond to the network side device in the embodiment of the method of the present application, and the various units in the wireless communication device 600 are respectively for implementing Figure 5 For the sake of brevity, the corresponding processes of the network-side device in the method 300 are not repeated here.

[0338] Therefore, in an embodiment of the present application, if RLF is triggered by RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal sends an RRC re-establishment request in the selected cell, and does not perform cell switching or fast recovery in the selected cell but directly sends an RRC re-establishment request. This can avoid switching failures caused by the RLC retransmission counter reaching the maximum value, or avoid the problem of still being unable to perform data transmission after switching to the intra-DU cell, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue to perform data transmission, and can also solve the problem that the corresponding RLC entity cannot continue to perform data transmission after the RLC reaches the maximum number of retransmissions to trigger RLF.

[0339] Alternatively, if the RLF is triggered by the RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal performs switching for the selected cell and performs RLC reconstruction during the rapid recovery process, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission. It can also solve the problem that the corresponding RLC entity cannot continue data transmission after the RLC reaches the maximum number of retransmissions and triggers RLF.

[0340] Alternatively, if the RLF is triggered by the RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal resets the RLC retransmission counter to avoid handover failure caused by the RLC retransmission counter reaching the maximum value, or to avoid the problem of data transmission still not being able to be performed after the handover, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission, and can also solve the problem that the corresponding RLC entity cannot continue data transmission after the RLC reaches the maximum number of retransmissions to trigger RLF.

[0341] Alternatively, if the RLF is triggered by RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal performs RLC reconstruction or PDCP data recovery of the AM DRB to avoid handover failure caused by the RLC retransmission counter reaching the maximum value, or to avoid the problem of data transmission still not being able to be performed after the handover, so that data transmission can continue on the selected cell, ensuring that the RLC entity that has reached the maximum number of retransmissions can continue data transmission, and can also solve the problem that the corresponding RLC entity cannot continue data transmission after the RLC reaches the maximum number of retransmissions to trigger RLF.

[0342] Figure 9 FIG. 7 shows a schematic block diagram of a wireless communication device 700 according to an embodiment of the present application. Figure 9 As shown, the wireless communication device 700 includes: a processing unit 710;

[0343] The processing unit 710 is configured to reset a radio link control RLC retransmission count counter when performing a handover; or,

[0344] If a radio link failure (RLF) or a handover failure is detected, the processing unit 710 is configured to reset the RLC retransmission count counter when performing fast recovery.

[0345] In some embodiments, the processing unit 710 may be embedded in or independent of a processor of the terminal in the form of hardware.

[0346] It should be understood that the wireless communication device 700 according to the embodiment of the present application may correspond to the terminal in the method embodiment of the present application, and the various units in the wireless communication device 700 are respectively for implementing Figure 6 For the sake of brevity, the corresponding process of the terminal in the method 400 is not repeated here.

[0347] Therefore, in an embodiment of the present application, the terminal resets the RLC retransmission counter when performing a handover, thereby enabling the RLC retransmission counter to better match the cell after the handover, thereby improving the data transmission reliability after the handover. Alternatively, if an RLF or handover failure is detected, the terminal resets the RLC retransmission counter when performing a fast recovery, ensuring that the terminal can send an RRC reconfiguration complete message or other data information on the target cell, thereby quickly switching to the target cell and improving the data transmission reliability of the target cell.

[0348] The wireless communication device in the embodiments of the present application can be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or chip. The electronic device can be a terminal or a network-side device, or can be a device other than a terminal or a network-side device. For example, the terminal can include but is not limited to the types of terminals 11 listed above, the network-side device can include but is not limited to the types of network-side devices 12 listed above, and other devices can be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiments of the present application.

[0349] The wireless communication device provided in the embodiment of the present application can achieve Figure 4 or Figure 5 or Figure 6 The various processes implemented by the method embodiment achieve the same technical effect and are not described here again to avoid repetition.

[0350] like Figure 10 As shown, an embodiment of the present application further provides a communication device 800, including a processor 801 and a memory 802, where the memory 802 stores programs or instructions that can be run on the processor 801.

[0351] For example, when the communication device 800 is a terminal, the program or instruction is executed by the processor 801 to implement the various steps performed by the terminal in the above-mentioned wireless communication method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0352] For another example, when the communication device 800 is a network side device, the program or instruction is executed by the processor 801 to implement the various steps performed by the network side device in the above-mentioned wireless communication method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0353] The embodiment of the present application also provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the following Figure 4 or Figure 6The steps performed by the terminal in the method embodiment shown. This terminal embodiment corresponds to the above-mentioned terminal side method embodiment, and each implementation process and implementation method of the above-mentioned method embodiment can be applied to this terminal embodiment and can achieve the same technical effect. Specifically, Figure 11 A schematic diagram of the hardware structure of a terminal for implementing an embodiment of the present application.

[0354] The terminal 900 includes but is not limited to: a radio frequency unit 901, a network module 902, an audio output unit 903, an input unit 904, a sensor 905, a display unit 906, a user input unit 907, an interface unit 908, a memory 909 and at least some of the components of the processor 910.

[0355] Those skilled in the art will understand that the terminal 900 may also include a power supply (such as a battery) to power each component. The power supply can be logically connected to the processor 910 through a power management system, thereby realizing functions such as managing charging, discharging, and power consumption management through the power management system. Figure 11 The terminal structure shown in the figure does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be repeated here.

[0356] It should be understood that in an embodiment of the present application, the input unit 904 may include a graphics processing unit (GPU) 9041 and a microphone 9042, and the graphics processor 9041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 906 may include a display panel 9061, and the display panel 9061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 907 includes a touch panel 9071 and at least one of other input devices 9072. The touch panel 9071 is also called a touch screen. The touch panel 9071 may include two parts: a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and an operating stick, which will not be repeated here.

[0357] In the embodiment of the present application, after receiving downlink data from a network-side device, the RF unit 901 may transmit the data to the processor 910 for processing. Furthermore, the RF unit 901 may send uplink data to the network-side device. Typically, the RF unit 901 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, and the like.

[0358] The memory 909 can be used to store software programs or instructions and various data. The memory 909 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, applications or instructions required for at least one function (such as a sound playback function, an image playback function, etc.). In addition, the memory 909 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM), and a direct memory bus random access memory (DRRAM). The memory 909 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0359] Processor 910 may include at least one processing unit. Optionally, processor 910 integrates an application processor and a modem processor. The application processor primarily handles operations related to the operating system, user interface, and application programs, while the modem processor primarily processes wireless communication signals, such as a baseband processor. It is understood that the modem processor may not be integrated into processor 910.

[0360] In some embodiments, if RLF is detected, the processor 910 is configured to perform cell selection;

[0361] If the detected RLF is triggered by a radio link control RLC reaching a maximum number of retransmissions, and the selected cell is a layer 1 / layer 2 triggered mobility LTM candidate cell, the processor 910 is further configured to perform a first operation;

[0362] The first operation includes one of the following: sending a radio resource control RRC re-establishment request in the selected cell, performing handover for the selected cell, resetting an RLC retransmission counter, performing RLC re-establishment or packet data convergence protocol PDCP data recovery of an acknowledgement mode AM data radio bearer DRB.

[0363] In some embodiments, the processor 910 is used to reset the radio link control RLC retransmission counter when performing a handover; or, if a radio link failure RLF or a handover failure is detected, the processor 910 is used to reset the RLC retransmission counter when performing a fast recovery.

[0364] It can be understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the method embodiment and achieve the same or corresponding technical effects. To avoid repetition, it will not be described here.

[0365] The embodiment of the present application further provides a network side device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the following Figure 5 The steps performed by the network-side device in the method embodiment shown are as follows. This network-side device embodiment corresponds to the above-mentioned network-side device method embodiment. Each implementation process and implementation method of the above-mentioned method embodiment are applicable to this network-side device embodiment and can achieve the same technical effect. For the sake of brevity, they are not described here in detail.

[0366] Specifically, the embodiment of the present application also provides a network side device. Figure 12 As shown, network-side device 1000 includes an antenna 101, a radio frequency device 102, a baseband device 103, a processor 104, and a memory 105. Antenna 101 is connected to radio frequency device 102. In the uplink direction, radio frequency device 102 receives information via antenna 101 and sends the received information to baseband device 103 for processing. In the downlink direction, baseband device 103 processes the information to be transmitted and sends it to radio frequency device 102. Radio frequency device 102 processes the received information and then sends it through antenna 101.

[0367] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 103 , which includes a baseband processor.

[0368] The baseband device 103 may include, for example, at least one baseband board, on which at least two chips are provided, such as Figure 12 As shown, one of the chips is, for example, a baseband processor, which is connected to the memory 105 via a bus interface to call the program in the memory 105 to execute the network device operations shown in the above method embodiment.

[0369] The network side device may further include a network interface 106, which is, for example, a Common Public Radio Interface (CPRI).

[0370] Specifically, the network side device 1000 of the embodiment of the present application further includes: instructions or programs stored in the memory 105 and executable on the processor 104, and the processor 104 calls the instructions or programs in the memory 105 to execute Figure 8 The methods performed by the units shown achieve the same technical effects, so they will not be described here in detail to avoid repetition.

[0371] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned wireless communication method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0372] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. In some examples, the readable storage medium may be a non-transitory readable storage medium.

[0373] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned wireless communication method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0374] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0375] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium. The computer program / program product is executed by at least one processor to implement the various processes of the above-mentioned wireless communication method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0376] An embodiment of the present application also provides a communication system, including: a terminal and a network side device, wherein the terminal can be used to execute the steps performed by the terminal in the wireless communication method as described above, and the network side device can be used to execute the steps performed by the network side device in the wireless communication method as described above.

[0377] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0378] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general-purpose hardware platform, or of course, by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes a number of instructions for enabling a terminal or network-side device to execute the methods described in each embodiment of the present application.

[0379] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of this application and the scope of protection of the claims. These implementation methods are all within the protection of this application.

Claims

1. A wireless communication method, characterized in that: include: If a radio link failure (RLF) is detected, the terminal performs cell selection. If the detected RLF is triggered by a radio link control RLC reaching a maximum number of retransmissions, and the selected cell is a layer 1 / layer 2 triggered mobility LTM candidate cell, the terminal performs a first operation; The first operation includes at least one of the following: sending a radio resource control RRC re-establishment request in the selected cell, performing handover for the selected cell, resetting an RLC retransmission counter, performing RLC re-establishment or PDCP data recovery of a packet data convergence protocol (PDCP) of an acknowledgement mode AM data radio bearer (DRB).

2. The method according to claim 1, characterized in that The first operation includes sending an RRC re-establishment request in the selected cell, and the terminal performing the first operation includes: If the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, the terminal sends an RRC re-establishment request to the selected cell; or, If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, the terminal sends an RRC re-establishment request in the selected cell.

3. The method according to claim 1, characterized in that The first operation includes performing RLC reestablishment or PDCP data recovery of an AM DRB, and the terminal performing the first operation includes: If the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when performing handover for the selected cell, the terminal performs RLC re-establishment or PDCP data recovery of the AM DRB; or If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when switching is performed for the selected cell, the terminal performs RLC reconstruction or PDCP data recovery of AM DRB.

4. The method according to claim 1, wherein The first operation includes resetting an RLC retransmission count counter, and the terminal performing the first operation includes: If the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when performing handover for the selected cell, the terminal resets the RLC retransmission count counter; or, If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when performing switching for the selected cell, the terminal resets the RLC retransmission count counter.

5. The method according to claim 1, characterized in that The first operation includes performing handover for the selected cell, and the terminal performing the first operation includes: If the second identifier associated with the selected cell is different from the first identifier associated with the serving cell, the terminal performs handover for the selected cell; or If the fourth identifier associated with the selected cell is different from the third identifier associated with the serving cell, the terminal performs handover for the selected cell; or If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is different from the first identifier associated with the serving cell, the terminal performs handover for the selected cell.

6. The method according to any one of claims 2 to 5, characterized in that Before the terminal performs the first operation, the method further includes: The terminal receives configuration information from the network side device; The configuration information includes at least one of the following: The first identifier associated with the service cell, at least one LTM candidate cell, the second identifier associated with each LTM candidate cell in the at least one LTM candidate cell, the third identifier associated with the service cell, the fourth identifier associated with each LTM candidate cell in the at least one LTM candidate cell, an indication allowing fast recovery, and an indication allowing execution of the first operation.

7. The method according to any one of claims 1 to 6, characterized in that In the case where the first operation includes performing RLC re-establishment or PDCP data recovery of an AM DRB, the first operation is applicable to at least one of the following: an RLC entity that has reached the maximum number of retransmissions, a PDCP entity associated with the RLC entity that has reached the maximum number of retransmissions; or In case that the first operation includes resetting an RLC retransmission number counter, the first operation is applicable to an RLC entity that has reached a maximum retransmission number.

8. The method according to any one of claims 1 to 7, characterized in that In a case where the first operation includes performing RLC reestablishment or PDCP data recovery of an AM DRB or resetting an RLC retransmission count counter, the method further includes: The terminal sends first indication information to the network side device; The first indication information is used to indicate that the terminal has performed RLC re-establishment or PDCP data recovery of AM DRB or reset the RLC retransmission count counter when performing handover.

9. The method according to claim 8, characterized in that The first indication information occupies at least one bit in a first media access control layer control element MAC CE, or the first indication information is represented by a specific media access control MAC subheader.

10. The method according to claim 8, characterized in that The first indication information is represented by a second MAC CE, and the second MAC CE includes at least one of the following: At least one bit, used to indicate that the terminal has performed RLC re-establishment or PDCP data recovery of an AM DRB or reset an RLC retransmission count counter when performing a handover; RB type information corresponding to the radio bearer RB for which RLC re-establishment or PDCP data recovery of AM DRB is performed; Identification information of the RB for which RLC re-establishment or PDCP data recovery of AM DRB is performed; RB type information corresponding to the RB for which the RLC retransmission counter is reset; Identification information of the RB for which the RLC retransmission counter is reset.

11. The method according to any one of claims 8 to 10, characterized in that The first indication information is carried by at least one of the following: Message 3 in four-step random access; Message A in two-step random access; The media access control protocol data unit MAC PDU where the RRC reconfiguration complete message is located; The MAC PDU before the MAC PDU containing the RRC reconfiguration complete message.

12. The method according to any one of claims 1 to 11, characterized in that Before the terminal performs the first operation, the method further includes: The terminal receives second indication information from the network side device; The second indication information is used to indicate that if the RLF is triggered by the RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the terminal is allowed to perform the first operation.

13. A wireless communication method, characterized in that: include: The network side device sends second indication information to the terminal; The second indication information is used to indicate that if the radio link failure RLF is triggered by the radio link control RLC reaching the maximum number of retransmissions and the selected cell is a mobility LTM candidate cell triggered by layer 1 / layer 2, the terminal is allowed to perform the first operation; The first operation includes one of the following: A radio resource control (RRC) re-establishment request is sent in the selected cell, a handover is performed for the selected cell, an RLC retransmission counter is reset, and RLC re-establishment or PDCP data recovery of an acknowledged mode AM data radio bearer (DRB) is performed.

14. The method according to claim 13, wherein: The method further comprises: The network side device sends configuration information to the terminal; The configuration information includes at least one of the following: A first identifier associated with the serving cell, at least one LTM candidate cell, a second identifier associated with each LTM candidate cell in the at least one LTM candidate cell, a third identifier associated with the serving cell, a fourth identifier associated with each LTM candidate cell in the at least one LTM candidate cell, an indication allowing fast recovery, and an indication allowing execution of the first operation.

15. The method according to claim 13 or 14, characterized in that In the case where the first operation includes performing RLC re-establishment or PDCP data recovery of an AM DRB, the first operation is applicable to at least one of the following: an RLC entity that has reached the maximum number of retransmissions, a PDCP entity associated with the RLC entity that has reached the maximum number of retransmissions; or In case that the first operation includes resetting an RLC retransmission number counter, the first operation is applicable to an RLC entity that has reached a maximum retransmission number.

16. The method according to any one of claims 13 to 15, characterized in that In a case where the first operation includes performing RLC reestablishment or PDCP data recovery of an AM DRB or resetting an RLC retransmission count counter, the method further includes: The network side device receives first indication information from the terminal; The first indication information is used to indicate that the terminal has performed RLC re-establishment or PDCP data recovery of AM DRB or reset the RLC retransmission count counter when performing handover.

17. The method according to claim 16, characterized in that The first indication information occupies at least one bit in a first media access control layer control element MAC CE, or the first indication information is represented by a specific media access control MAC subheader.

18. The method according to claim 16, characterized in that The first indication information is represented by a second MAC CE, and the second MAC CE includes at least one of the following: At least one bit, used to indicate that the terminal has performed RLC re-establishment or PDCP data recovery of an AM DRB or reset an RLC retransmission count counter when performing a handover; RB type information corresponding to the radio bearer RB for which RLC re-establishment or PDCP data recovery of AM DRB is performed; Identification information of the RB for which RLC re-establishment or PDCP data recovery of AM DRB is performed; RB type information corresponding to the RB for which the RLC retransmission counter is reset; Identification information of the RB for which the RLC retransmission counter is reset.

19. The method according to any one of claims 16 to 18, characterized in that The indication information is carried by at least one of the following: Message 3 in four-step random access; Message A in two-step random access; The media access control protocol data unit MAC PDU where the RRC reconfiguration complete message is located; The MAC PDU before the MAC PDU containing the RRC reconfiguration complete message.

20. A wireless communication method, characterized in that: include: The terminal resets the radio link control RLC retransmission count counter when performing handover; or, If a radio link failure RLF or a handover failure is detected, the terminal resets the RLC retransmission count counter when performing fast recovery.

21. A wireless communication device, characterized in that: include: processing unit; If a radio link failure (RLF) is detected, the processing unit is configured to perform cell selection; If the detected RLF is triggered by a radio link control RLC reaching a maximum number of retransmissions, and the selected cell is a layer 1 / layer 2 triggered mobility LTM candidate cell, the processing unit is further configured to perform a first operation; The first operation includes one of the following: sending a radio resource control RRC re-establishment request in the selected cell, performing handover for the selected cell, resetting an RLC retransmission counter, performing RLC re-establishment or packet data convergence protocol PDCP data recovery of an acknowledgement mode AM data radio bearer DRB.

22. The device according to claim 21, characterized in that The first operation includes sending an RRC re-establishment request in the selected cell, and the processing unit is specifically configured to: If the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, controlling the wireless communication device to send an RRC re-establishment request in the selected cell; or If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, control the wireless communication device to send an RRC re-establishment request in the selected cell.

23. The device according to claim 21, characterized in that The first operation includes performing RLC reestablishment or PDCP data recovery of AMDRB, and the processing unit is specifically configured to: If the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, performing RLC re-establishment or PDCP data recovery of the AM DRB when performing handover for the selected cell; or, If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, when switching is performed for the selected cell, RLC reconstruction or PDCP data recovery of AM DRB is performed.

24. The device according to claim 21, characterized in that The first operation includes resetting the RLC retransmission count counter, and the processing unit is specifically configured to: If the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, resetting the RLC retransmission count counter when performing handover for the selected cell; or, If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is the same as the first identifier associated with the serving cell, the RLC retransmission count counter is reset when switching is performed on the selected cell.

25. The device according to claim 21, characterized in that The first operation includes performing handover for the selected cell, and the processing unit is specifically configured to: If the second identifier associated with the selected cell is different from the first identifier associated with the serving cell, performing handover for the selected cell; or If the fourth identifier associated with the selected cell is different from the third identifier associated with the serving cell, performing handover for the selected cell; or, If the fourth identifier associated with the selected cell is the same as the third identifier associated with the serving cell, and the second identifier associated with the selected cell is different from the first identifier associated with the serving cell, handover is performed on the selected cell.

26. The device according to any one of claims 21 to 25, characterized in that Before the wireless communication apparatus performs the first operation, the wireless communication apparatus further includes: A transceiver unit, configured to receive configuration information from a network-side device; The configuration information includes at least one of the following: A first identifier associated with the serving cell, at least one LTM candidate cell, a second identifier associated with each LTM candidate cell in the at least one LTM candidate cell, a third identifier associated with the serving cell, a fourth identifier associated with each LTM candidate cell in the at least one LTM candidate cell, an indication allowing fast recovery, and an indication allowing execution of the first operation.

27. The device according to any one of claims 21 to 26, characterized in that In a case where the first operation includes performing RLC re-establishment or PDCP data recovery of an AM DRB or resetting an RLC retransmission count counter, the wireless communication apparatus further includes: A transceiver unit, configured to send first indication information to a network-side device; The first indication information is used to indicate that the wireless communication device has performed RLC re-establishment or PDCP data recovery of AM DRB or reset the RLC retransmission count counter when performing handover.

28. The device according to any one of claims 21 to 27, characterized in that Before the wireless communication apparatus performs the first operation, the wireless communication apparatus further includes: The transceiver unit is configured to receive second indication information from a network-side device; The second indication information is used to indicate that if the RLF is triggered by the RLC reaching the maximum number of retransmissions and the selected cell is an LTM candidate cell, the wireless communication device is allowed to perform the first operation.

29. A wireless communication device, characterized in that: include: a transceiver unit, configured to send second indication information to the terminal; The second indication information is used to indicate that if the radio link failure RLF is triggered by the radio link control RLC reaching the maximum number of retransmissions and the selected cell is a mobility LTM candidate cell triggered by layer 1 / layer 2, the terminal is allowed to perform the first operation; The first operation includes one of the following: A radio resource control (RRC) re-establishment request is sent in the selected cell, a handover is performed for the selected cell, an RLC retransmission counter is reset, and RLC re-establishment or PDCP data recovery of an acknowledged mode AM data radio bearer (DRB) is performed.

30. The device according to claim 29, characterized in that The transceiver unit is further configured to send configuration information to the terminal; The configuration information includes at least one of the following: A first identifier associated with the serving cell, at least one LTM candidate cell, a second identifier associated with each LTM candidate cell in the at least one LTM candidate cell, a third identifier associated with the serving cell, a fourth identifier associated with each LTM candidate cell in the at least one LTM candidate cell, an indication allowing fast recovery, and an indication allowing execution of the first operation.

31. The device according to claim 29 or 30, characterized in that In a case where the first operation includes performing RLC reestablishment or PDCP data recovery of an AM DRB or resetting an RLC retransmission count counter, the transceiver unit is further configured to receive first indication information from the terminal; The first indication information is used to indicate that the terminal has performed RLC re-establishment or PDCP data recovery of AM DRB or reset the RLC retransmission count counter when performing handover.

32. A wireless communication device, characterized in that: include: processing unit; The processing unit is configured to reset a radio link control RLC retransmission count counter when performing a handover; or, If a radio link failure RLF or a handover failure is detected, the processing unit is configured to reset the RLC retransmission count counter when performing fast recovery.

33. A terminal, characterized in that: The invention comprises a transceiver, a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the wireless communication method according to any one of claims 1 to 12 are implemented, or the steps of the wireless communication method according to claim 20 are implemented.

34. A network side device, characterized in that: The wireless communication device comprises a transceiver, a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the wireless communication method according to any one of claims 13 to 19 are implemented.

35. A readable storage medium, characterized in that The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, it implements the steps of the wireless communication method according to any one of claims 1 to 12, or implements the steps of the wireless communication method according to any one of claims 13 to 19, or implements the steps of the wireless communication method according to claim 20.

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