Cell switching processing method and device, equipment and storage medium

Abstract

The invention discloses a cell switching processing method and device, equipment and a storage medium, and belongs to the technical field of communication, and the cell switching processing method comprises the steps that a terminal obtains at least one piece of LTM candidate cell configuration; under the condition that the terminal is switched to the target cell, at least part of LTM candidate cell configurations in the at least one LTM candidate cell configuration are released or reserved according to a first rule; wherein the first rule comprises any one of the following items: whether the target cell meets a first condition; and the indication information is sent by the target cell.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and specifically relates to a method, device, equipment and storage medium for processing cell switching. Background Art

[0002] The network side can pre-configure the conditional handover (CHO) configuration for the terminal, and the terminal evaluates whether the execution conditions are met to perform cell handover. For CHO, such as conditional layer 1 or layer 2 triggered mobility (L1 / L2-triggered mobility, LTM) handover, the existing protocol only supports continuous LTM handover within a centralized unit (CU) (called Intra-CU).

[0003] In the mobility enhancement project, LTM between CUs (called Inter-CU) is supported. Inter-CU LTM switching involves changes in the Packet Data Convergence Protocol (PDCP) entity on the network side, so a cell key change is required. After the cell key change, other candidate cell keys prepared by the source CU can no longer be used. Therefore, when the terminal continues to perform LTM switching, the terminal cannot apply the configuration of these candidate cells to switch to the corresponding candidate cells, resulting in the failure of the terminal's wireless link. Summary of the invention

[0004] The embodiments of the present application provide a method, apparatus, device and storage medium for processing cell switching, which can solve the problem that when Inter-CU switching occurs, the terminal continues to perform LTM switching, resulting in the failure of the terminal's wireless link.

[0005] In a first aspect, a method for processing cell switching is provided, the method comprising: a terminal obtains at least one LTM candidate cell configuration; when the terminal switches to a target cell, the terminal releases or retains at least part of the at least one LTM candidate cell configuration according to a first rule; wherein the first rule comprises any one of the following: whether the target cell satisfies a first condition; indication information sent by the target cell.

[0006] In a second aspect, a method for processing cell switching is provided, the method comprising: when confirming that the terminal switches to the target cell, the target CU sends an indication message to the terminal; wherein the indication message is used to release or retain at least part of the LTM candidate cell configuration in at least one LTM candidate cell configuration.

[0007] In a third aspect, a method for processing cell switching is provided, the method comprising: a source CU sends first information to a first CU, the first CU being all candidate CUs or target CUs, the first information being used by the target CU to send indication information to a terminal, the indication information being used to release or retain at least part of the LTM candidate cell configurations in at least one LTM candidate cell configuration; wherein the first information includes at least one of the following:

[0008] Configuration identification of each LTM candidate cell;

[0009] The PCI and frequency associated with the configuration identifier of each LTM candidate cell;

[0010] The CGI associated with the configuration identifier of each LTM candidate cell;

[0011] A first identifier associated with each LTM candidate cell;

[0012] The identifier of the first list to which each LTM candidate cell belongs.

[0013] In a fourth aspect, a method for processing cell switching is provided, the method comprising: when confirming that the terminal switches to the target cell, the target CU sends second information to the target DU; wherein the second information includes at least one of the following: second indication information, used to instruct to stop sending the LTM switching command to the terminal; a list of identifiers of candidate target cells.

[0014] In a fifth aspect, a cell switching processing device is provided, the device comprising: an acquisition module and a processing module. The acquisition module is used to acquire at least one LTM candidate cell configuration. The processing module is used to release or retain at least part of the LTM candidate cell configuration in the at least one LTM candidate cell configuration according to a first rule when switching to a target cell. The first rule includes any one of the following: whether the target cell meets the first condition; indication information sent by the target cell.

[0015] In a sixth aspect, a cell switching processing device is provided, the device comprising: a sending module. The sending module is used to send indication information to the terminal when confirming that the terminal switches to the target cell; wherein the indication information is used to release or retain at least part of the LTM candidate cell configuration in at least one LTM candidate cell configuration.

[0016] In a seventh aspect, a cell switching processing device is provided, the device comprising: a sending module. The sending module is used to send first information to a first CU, the first CU being all candidate CUs or target CUs, the first information being used by the target CU to send indication information to a terminal, the indication information being used to release or retain at least part of the LTM candidate cell configurations in at least one LTM candidate cell configuration; wherein the first information includes at least one of the following:

[0017] Configuration identification of each LTM candidate cell;

[0018] The PCI and frequency associated with the configuration identifier of each LTM candidate cell;

[0019] The CGI associated with the configuration identifier of each LTM candidate cell;

[0020] A first identifier associated with each LTM candidate cell;

[0021] The identifier of the first list to which each LTM candidate cell belongs.

[0022] In an eighth aspect, a cell switching processing device is provided, the device comprising: a sending module. The sending module is used to send second information to the target DU when confirming that the terminal switches to the target cell; wherein the second information includes at least one of the following: second indication information, used to indicate to stop sending the LTM switching command to the terminal; and a list of identifiers of candidate target cells.

[0023] In a ninth aspect, a terminal is provided, comprising 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 are implemented.

[0024] In a tenth aspect, a terminal is provided, comprising a processor and a communication interface, wherein the communication interface is used to obtain at least one LTM candidate cell configuration. The processor is used to release or retain at least part of the at least one LTM candidate cell configuration according to a first rule when switching to a target cell; wherein the first rule includes any one of the following: whether the target cell satisfies a first condition; indication information sent by the target cell.

[0025] In the eleventh aspect, a network side device is provided, which includes 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, or the steps of the method described in the third aspect are implemented, or the steps of the method described in the fourth aspect are implemented.

[0026] In the twelfth aspect, a network side device is provided, including a processor and a communication interface, wherein the communication interface is used to send an indication message to the terminal when confirming that the terminal has switched to a target cell; wherein the indication message is used to release or retain at least part of the LTM candidate cell configuration in at least one LTM candidate cell configuration.

[0027] Alternatively, the communication interface is used to send first information to the first CU, where the first CU is all candidate CUs or target CUs, and the first information is used for the target CU to send indication information to the terminal, and the indication information is used to release or retain at least part of the LTM candidate cell configuration in at least one LTM candidate cell configuration; wherein the first information includes at least one of the following:

[0028] Configuration identification of each LTM candidate cell;

[0029] The PCI and frequency associated with the configuration identifier of each LTM candidate cell;

[0030] The CGI associated with the configuration identifier of each LTM candidate cell;

[0031] A first identifier associated with each LTM candidate cell;

[0032] The identifier of the first list to which each LTM candidate cell belongs.

[0033] Alternatively, the communication interface is used to send second information to the target DU when confirming that the terminal switches to the target cell; wherein the second information includes at least one of the following: second indication information, used to instruct to stop sending the LTM switching command to the terminal; a list of identifiers of candidate target cells.

[0034] In the thirteenth 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, or the steps of the method described in the fourth aspect are implemented.

[0035] In the fourteenth 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 network side device can be used to execute the steps of the method described in the third aspect.

[0036] In the fifteenth 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 a program or instructions to implement the method described in the first aspect, or the method described in the second aspect, or the method described in the third aspect, or the method described in the fourth aspect.

[0037] In the sixteenth aspect, a computer program / program product is provided, wherein the computer program / program product is stored in a storage medium, and the program / program product is executed by at least one processor to implement the steps of the cell switching processing method as described in the first aspect, or the steps of the cell switching processing method as described in the second aspect, or the steps of the cell switching processing method as described in the third aspect, or the steps of the cell switching processing method as described in the fourth aspect.

[0038] In an embodiment of the present application, after switching to the target cell, the terminal can release or retain at least part of the LTM candidate cell configuration according to the first rule, and the first rule includes whether the target cell meets the first condition, or includes the indication information sent by the target cell. In this scheme, the terminal can determine whether the switch is an Inter-CU switch by judging whether the target cell meets the first condition, so as to decide the LTM candidate cell configuration that needs to be released or retained according to the judgment result; or, the terminal can decide the LTM candidate cell configuration that needs to be released or retained according to the indication of the indication information sent by the target cell, and the indication information is sent to the terminal after the target CU determines whether the switch is an Inter-CU switch. In this way, after the Inter-CU switch occurs, the terminal can decide autonomously or release or retain at least part of the LTM candidate cell configuration according to the indication of the indication information, which can avoid subsequent switching to an unavailable LTM candidate cell, thereby avoiding the failure of the terminal's wireless link and improving the accuracy of cell switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic diagram of the architecture of a wireless communication system provided in an embodiment of the present application;

[0040] Figure 2 It is a schematic diagram of the architecture of a CU-DU provided by the related technology;

[0041] Figure 3A It is one of the schematic diagrams for CU and DU switching provided by the related art;

[0042] Figure 3B This is the second schematic diagram of a CU and DU switching provided by the related art;

[0043] Figure 3C This is a third schematic diagram of a CU and DU switching method provided by the related art;

[0044] Figure 4 This is one of the flowcharts of a method for processing a cell handover provided in an embodiment of the present application;

[0045] Figure 5 This is a second flowchart of a method for processing a cell handover provided in an embodiment of the present application;

[0046] Figure 6 This is a flowchart of a method for processing a cell handover provided in an embodiment of the present application;

[0047] Figure 7 This is a fourth flowchart of a method for processing a cell handover provided in an embodiment of the present application;

[0048] Figure 8 This is one of the structural schematic diagrams of a cell switching processing device provided in an embodiment of the present application;

[0049] Fig. 9 This is a second structural diagram of a cell switching processing device provided in an embodiment of the present application;

[0050] Fig.10 This is a third structural diagram of a cell switching processing device provided in an embodiment of the present application;

[0051] Fig.11 This is a fourth structural diagram of a cell switching processing device provided in an embodiment of the present application;

[0052] Fig.12 This is a fifth structural diagram of a cell switching processing device provided in an embodiment of the present application;

[0053] Fig.13 This is a sixth structural diagram of a cell switching processing device provided in an embodiment of the present application;

[0054] Fig.14 It is a schematic diagram of the hardware structure of a communication device provided in an embodiment of the present application;

[0055] Fig.15 is a schematic diagram of the hardware structure of a terminal provided in an embodiment of the present application;

[0056] Fig.16 It is a schematic diagram of the hardware structure of a network side device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0058] The terms "first", "second", etc. of the present 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 one type, and the number of objects is not limited, for example, the first object can be one or more. In addition, "or" in the present application represents at least one of the connected objects. For example, "A or B" covers three schemes, namely, Scheme 1: including A but not including B; Scheme 2: including B but not including A; Scheme 3: including both A and B. The character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0059] 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, operations to be performed, or request results in the sent indication; an indirect indication can be understood as the receiver determining the corresponding information according to the indication sent by the sender, or making a judgment and determining the operation to be performed or the request result according to the judgment result.

[0060] The terms "at least one (item)", "at least one of" and the like in this application refer to any one, any two or a combination of more than two of the objects included therein. For example, at least one (item) of a, b, and c can be represented by: "a", "b", "c", "a and b", "a and c", "b and c" and "a, b and c", where a, b, and c can be single or multiple. Similarly, "at least two (items)" refers to two or more, and its meaning is similar to that of "at least one (item)".

[0061] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as 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) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology 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 illustrative purposes, and NR terminology is used in most of the following descriptions, but these technologies can also be applied to systems other than NR systems, such as the 6th generation (6 th Generation, 6G) communication system.

[0062] Figure 1A block diagram of a wireless communication system applicable to an embodiment of the present application is shown. The wireless communication system includes a terminal 11 and a network side device 12. Among them, 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 (Personal Digital Assistant, PDA), a handheld computer, a netbook, an ultra-mobile personal computer (Ultra-mobile Personal Computer, UMPC), a mobile Internet device (Mobile Internet Device, MID), an augmented reality (Augmented Reality, AR), a virtual reality (Virtual Reality, VR) device, a robot, a wearable device (Wearable Device), an aircraft (flight vehicle), a vehicle-mounted device (Vehicle User Equipment, VUE), a ship-mounted device, a pedestrian terminal (Pedestrian User Equipment, PUE), a smart home (home appliances with wireless communication functions, such as refrigerators, televisions, washing machines or furniture, etc.), a game console, a personal computer (Personal Computer, PC), a teller machine or a self-service machine 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, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a 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. The network side device 12 may include an access network device or a core network device, wherein the access network device may also be referred to as a radio access network (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 (Wireless Local Area Network, WLAN) access point (Access Point, AS) or a wireless fidelity (Wireless Fidelity, WiFi) node, etc.Among them, the base station may be referred to as a Node B (NB), an evolved Node B (eNB), a next generation Node B (gNB), a New Radio Node B (NR Node B), an access point, a Relay Base Station (RBS), a Serving Base Station (SBS), a Base Transceiver Station (BTS), a radio base station, a radio transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a Home Node B (HNB), a Home Evolved Node B (home evolved Node B), a 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.

[0063] The following is an explanation of some concepts and / or terms involved in a cell switching processing method, apparatus, device and storage medium provided in an embodiment of the present application.

[0064] 1. CU-Distributed Unit (DU) Architecture

[0065] The NR access network splits the gNB into gNB-CU and gNB-DU and connects them through the F1 interface. The architecture of CU-DU is as follows Figure 2 shown.

[0066] Among them, a gNB contains only one CU, one or more DUs, and one DU contains one or more cells.

[0067] CU includes the protocol stack of PDCP and above, and DU includes the protocol stack below the PDCP layer, such as Radio Link Control (RLC), Medium Access Control (MAC), Physical (PHY), etc.

[0068] In the control plane, CU includes Radio Resource Control (RRC) and PDCP (PDCP-C) of the control plane;

[0069] On the user plane, the CU includes the Service Data Adaptation Protocol (SDAP) and the PDCP of the user plane (PDCP-U).

[0070] (1) Intra-CU, Intra-DU switching

[0071] That is, the terminal switches between different cells in the same DU under the same CU. Figure 3A As shown in the figure, when the terminal switches from cell 1 of DU1 to cell 2 of DU1, the PDCP and RLC entities on the terminal side are not affected because the physical locations of the entities at each layer on the base station side have not changed. Since the cell serving the terminal has changed, the MAC layer of the terminal needs to be reset and the PHY layer needs to be reconfigured.

[0072] (2) Intra-CU, Inter-DU switching

[0073] That is, the terminal switches between cells of different DUs under the same CU. Figure 3B As shown, the terminal switches from a cell of DU1 to a cell of DU2. Since the RLC and MAC entities on the base station side have changed, the RLC layer of the terminal needs to be rebuilt, the MAC layer needs to be reset, the PHY layer needs to be reconfigured, and the PDCP layer needs to perform data recovery (Data Recovery) under the Acknowledged Mode (AM) bearer, and the data packets that have not been transmitted are retransmitted at the PDCP layer.

[0074] (3) Inter-CU switching

[0075] That is, the terminal switches between different CUs (i.e., different gNBs). Figure 3C As shown, the terminal switches from DU1 of CU1 to DU2 of CU2, so the RLC layer needs to be rebuilt, the MAC layer needs to be reset, the PHY layer needs to be reconfigured, the PDCP entity changes, and the key changes, so the PDCP layer needs to be rebuilt. For Inter-CU switching, before each switching, the source cell needs to derive a new key for the candidate cell of the Inter-CU and reconfigure the terminal.

[0076] 2. LTM

[0077] To reduce the switching delay, R18 introduces LTM, that is, DU uses L1 / L2 signaling to instruct the terminal to switch to a suitable candidate cell based on the layer 1 measurement results reported by the terminal. R18 LTM only supports cell switching under the same CU.

[0078] R18 supports continuous Intra-CU LTM switching, that is, the terminal switches continuously between multiple configured candidate cells without the network reconfiguring the candidate cells.

[0079] R19 LTM studies Inter-CU LTM cell switching. It also studies conditional LTM, that is, the terminal triggers LTM switching based on condition evaluation.

[0080] 3. Conditional Switch (CHO)

[0081] The network pre-configures the CHO configuration for the terminal, and the terminal evaluates whether the execution conditions are met. Once the execution conditions are met, the terminal will apply the pre-configured target Master Cell Group (MCG) configuration to perform primary cell (PCell) switching.

[0082] During the CHO handover preparation process, for key derivation, if the source gNB has an unused {NH, NCC} pair, the source gNB will obtain the key of each candidate target cell based on the NH, the physical cell identifier (PCI) of the target cell, and the frequency point; if there is no unused {NH, NCC} pair, the source gNB will obtain the key of each candidate target cell based on the currently activated K gNB , using the PCI and frequency of the target cell as input to obtain the key of each candidate target cell. That is, the key of the candidate target cell is based on the same NH or K gNB The only difference is the input parameters (PCI, frequency). NH refers to the next hop, NCC refers to the next hop chaining counter, and K gNB Refers to the serving cell key.

[0083] After the CHO handover is completed, all CHO candidate cell configurations need to be released. The next CHO handover needs to be prepared again, and the keys of each candidate target cell are derived from the new source cell key.

[0084] The following is a detailed description of the cell switching processing method provided by the embodiment of the present application through some embodiments and their application scenarios in combination with the accompanying drawings.

[0085] As can be seen from the above, in the existing CHO switching process, after the switching is completed, all CHO configurations need to be released, and continuous CHO switching cannot be supported. For LTM, Rel-18 only supports continuous LTM switching of Intra-CU. In Rel-19, when Inter-CU LTM switching occurs, whether to support continuous LTM, which candidate cells need to be released, and how to release them need to be solved. That is, when Inter-CU LTM switching occurs, how to handle LTM switching needs to be solved.

[0086] In an embodiment of the present application, a scheme is provided that after executing a switch to a target cell, the terminal may release or retain at least part of the LTM candidate cell configuration according to a first rule, and the first rule includes whether the target cell satisfies a first condition, or includes indication information sent by the target cell. In this scheme, the terminal may determine whether the switch is an Inter-CU switch by judging whether the target cell satisfies the first condition, so as to decide the LTM candidate cell configuration that needs to be released or retained according to the judgment result; or, the terminal may decide the LTM candidate cell configuration that needs to be released or retained according to the indication of the indication information sent by the target cell, and the indication information is sent to the terminal after the target CU determines whether the switch is an Inter-CU switch. In this way, after an Inter-CU switch occurs, the terminal may decide autonomously or release or retain at least part of the LTM candidate cell configuration according to the indication of the indication information, so as to avoid subsequent switching to an unavailable LTM candidate cell, thereby avoiding the failure of the terminal's wireless link and improving the accuracy of the cell switch.

[0087] In another scheme, when the target CU confirms that the terminal switches to the target cell, the target CU sends a second message to the target DU, and the second message includes at least one of the following: a second indication message instructing to stop sending the LTM switching command to the terminal, and an identification list of candidate target cells. In this scheme, after the Inter-CU switching occurs, the target CU sends an indication to the target DU to stop sending the LTM switching command to the terminal, so that the target DU stops issuing the switching command to switch to other CUs, or the target CU sends an identification list of candidate target cells to the target DU, so that the terminal switches to the candidate target cell corresponding to the identification list. In this way, the full continuity of the Inter-CU switching is achieved, that is, the terminal can continue to execute the switch to the corresponding candidate cell, avoiding the failure of the terminal's wireless link and improving the accuracy of the cell switching.

[0088] It should be noted that the embodiments of the present application can be applied to base stations with separate CU and DU, and also to base stations with integrated CU and DU. In the case where CU and DU are integrated, the source CU and source DU both refer to the source gNB, and the target CU and target DU both refer to the target gNB.

[0089] The Inter-CU continuous switching described in the embodiment of the present application refers to: switching from a cell corresponding to a CU to a cell corresponding to another CU, and then switching from a cell corresponding to the other CU to another cell corresponding to the one CU. For example, assuming switching from CU1 to CU2, the cells corresponding to CU1 are cell 1 and cell 2, and the cells corresponding to CU2 are cell 3 and cell 4. Then, Inter-CU continuous switching refers to: switching from cell 1 corresponding to CU1 to cell 3 corresponding to CU2, then switching from cell 3 corresponding to CU2 to cell 2 corresponding to CU1, and then switching from cell 2 corresponding to CU1 to cell 4 corresponding to CU2. It should be noted that the cell corresponding to the CU here can be a cell included in the same DU corresponding to the CU, or it can also be a cell included in different DUs corresponding to the CU, or it can also be a cell included in the same DU corresponding to the CU and a cell included in different DUs.

[0090] The present application embodiment provides a method for processing a cell handover. Figure 4 FIG. 1 is a flow chart showing a method for processing a cell handover provided in an embodiment of the present application. Figure 4 As shown, the cell switching processing method provided in the embodiment of the present application may include the following steps 201 and 202.

[0091] Step 201: The terminal obtains at least one LTM candidate cell configuration.

[0092] In an embodiment of the present application, the terminal may receive at least one LTM candidate cell configuration from a source CU.

[0093] In the embodiment of the present application, an LTM candidate cell configuration includes: a partial configuration of the LTM candidate cell generated by the CU and a partial configuration of the LTM candidate cell generated by the DU. The DU is the DU under the CU. For example, LTM candidate cell configuration 1 includes: a partial configuration of the LTM candidate cell 1 generated by CU1 and another partial configuration of the LTM candidate cell 1 generated by DU1 under CU1.

[0094] Optionally, in the embodiment of the present application, there are three situations for the configuration of the at least one LTM candidate cell:

[0095] Case 1: All LTM candidate cells have the same CU and DU.

[0096] It can be understood that one CU corresponds to at least one DU, and one DU includes at least one cell.

[0097] In this case, the at least one LTM candidate cell configuration is generated by the same CU as a part of the configuration of each LTM candidate cell, and another part of the configuration of each LTM candidate cell is generated by a DU under the same CU.

[0098] For example, it is assumed that the at least one LTM candidate cell configuration is 3 LTM candidate cell configurations; CU1 corresponds to DU1, and DU1 includes cells 1 to 3. Then, LTM candidate cell configuration 1 includes: a part of the configuration of LTM candidate cell 1 generated by CU1 and another part of the configuration of LTM candidate cell 1 generated by DU1; LTM candidate cell configuration 2 includes: a part of the configuration of LTM candidate cell 2 generated by CU1 and another part of the configuration of LTM candidate cell 2 generated by DU1; LTM candidate cell configuration 3 includes: a part of the configuration of LTM candidate cell 3 generated by CU1 and another part of the configuration of LTM candidate cell 3 generated by DU1.

[0099] Case 2: The CUs corresponding to all LTM candidate cell configurations are the same, and at least some DUs are different.

[0100] In this case, the at least one LTM candidate cell configuration is generated by the same CU as a part of the configuration of each LTM candidate cell, and another part of the configuration of each LTM candidate cell is generated by different DUs under the same CU.

[0101] For example, assuming that the at least one LTM candidate cell configuration is 3 LTM candidate cell configurations; CU1 corresponds to DU1 and DU2, DU1 includes cell 1 and cell 2, and DU2 includes cell 3. Then, LTM candidate cell configuration 1 includes: a part of the configuration of LTM candidate cell 1 generated by CU1 and another part of the configuration of LTM candidate cell 1 generated by DU1; LTM candidate cell configuration 2 includes: a part of the configuration of LTM candidate cell 2 generated by CU1 and another part of the configuration of LTM candidate cell 2 generated by DU1; LTM candidate cell configuration 3 includes: a part of the configuration of LTM candidate cell 3 generated by CU1 and another part of the configuration of LTM candidate cell 3 generated by DU2.

[0102] For another example, assume that the at least one LTM candidate cell configuration is 3 LTM candidate cell configurations; CU1 corresponds to DU1, DU2 and DU3, DU1 includes cell 1, DU2 includes cell 2, and DU3 includes cell 3. Then, LTM candidate cell configuration 1 includes: a part of the configuration of LTM candidate cell 1 generated by CU1 and another part of the configuration of LTM candidate cell 1 generated by DU1; LTM candidate cell configuration 2 includes: a part of the configuration of LTM candidate cell 2 generated by CU1 and another part of the configuration of LTM candidate cell 2 generated by DU2; LTM candidate cell configuration 3 includes: a part of the configuration of LTM candidate cell 3 generated by CU1 and another part of the configuration of LTM candidate cell 3 generated by DU3.

[0103] Case 3: All LTM candidate cells have different CUs and DUs corresponding to their configurations.

[0104] In this case, the at least one LTM candidate cell configuration is generated by different CUs as a part of the configuration of each LTM candidate cell, and the other part of the configuration of each LTM candidate cell is generated by the DU under each CU.

[0105] For example, assuming that the at least one LTM candidate cell configuration is 2 LTM candidate cell configurations; CU1 corresponds to DU1, CU2 corresponds to DU2, DU1 includes cell 1, and DU2 includes cell 2. Then, LTM candidate cell configuration 1 includes: a portion of the configuration of LTM candidate cell 1 generated by CU1 and another portion of the configuration of LTM candidate cell 1 generated by DU1; LTM candidate cell configuration 2 includes: a portion of the configuration of LTM candidate cell 2 generated by CU2 and another portion of the configuration of LTM candidate cell 2 generated by DU2.

[0106] Optionally, in the embodiment of the present application, the above-mentioned LTM candidate cell configuration includes at least one of the following:

[0107] Layer 1 measurement configuration associated with the LTM candidate cell;

[0108] The cell configuration applied when the terminal accesses the LTM candidate cell;

[0109] Transmission Configuration Indicator (TCI) status configuration associated with the LTM candidate cell;

[0110] The Random Access Channel (RACH) configuration associated with the LTM candidate cell.

[0111] Optionally, in an embodiment of the present application, for conditional LTM, each LTM candidate cell configuration is associated with one or more execution conditions.

[0112] Optionally, in an embodiment of the present application, each candidate cell configuration includes or is associated with a first identifier, and the first identifier is used to determine whether to perform PDCP reconstruction and key change during switching.

[0113] Optionally, in an embodiment of the present application, each candidate cell configuration belongs to a first list, and the first list is used to determine whether to perform PDCP reconstruction and key change during switching.

[0114] Step 202: When the terminal switches to the target cell, the terminal releases or retains at least part of the LTM candidate cell configuration in at least one LTM candidate cell configuration according to the first rule.

[0115] In the embodiment of the present application, the first rule includes any one of the following:

[0116] Whether the target cell meets the first condition;

[0117] Indication information sent by the target cell.

[0118] Optionally, in the embodiment of the present application, the first condition includes at least one of the following:

[0119] The target cell and the source cell have the same first identifier, and the first identifier is used to determine whether to perform PDCP reestablishment and key change during handover;

[0120] The target cell and the source cell are in the same first list, and the first list is used to determine whether to perform PDCP reestablishment and key change during handover;

[0121] The primary cell configuration or primary cell group configuration of the target cell does not include a master key change indication, and the master key change indication is used to indicate that the terminal needs to change the master key during the process of switching the primary cell to the target cell;

[0122] The primary and secondary cell configuration or the secondary cell group configuration of the target cell does not include a secondary key change indication, and the secondary key change indication is used to indicate that the terminal needs to change the secondary key during the process of switching the primary and secondary cells to the target cell.

[0123] It should be noted that, when the source cell is a PCell, the LTM candidate cell configurations released by the terminal are all candidate PCell configurations. When the source cell is a primary secondary cell (PSCell), the LTM candidate cell configurations released by the terminal are all candidate PSCell configurations.

[0124] Optionally, in one embodiment of the present application, the first rule includes whether the target cell satisfies the first condition. The step 202 may be implemented by any one of the following steps 202a to 202c.

[0125] Step 202a: When the target cell meets the first condition, the terminal retains all LTM candidate cell configurations in at least one LTM candidate cell configuration.

[0126] It can be understood that when the target cell meets the first condition, the terminal determines that the LTM switch is an Intra-CU LTM switch, so all LTM candidate cell configurations can be retained.

[0127] Step 202b: When the target cell does not satisfy the first condition, the terminal releases all LTM candidate cell configurations in the at least one LTM candidate cell configuration.

[0128] It can be understood that when the target cell does not meet the first condition, the terminal determines that the LTM handover is Inter-CU LTM handover, and thus all LTM candidate cell configurations can be released.

[0129] In an embodiment of the present application, the terminal can determine whether the LTM switching is an Inter-CU switching based on whether the target cell meets the first condition. If it is an Inter-CU switching, the LTM switching cannot be executed continuously, and the terminal releases all LTM candidate cell configurations to avoid subsequent switching to an unavailable LTM candidate cell.

[0130] It can be understood that for the inter-CU LTM switching that is not supported continuously, after the inter-CU switching is completed, the terminal can release all LTM candidate cell configurations by itself.

[0131] Step 202c: When the target cell does not satisfy the first condition, the terminal retains at least one LTM candidate cell configuration that satisfies the second condition or the third condition, and releases the remaining LTM candidate cell configurations.

[0132] In the embodiment of the present application, the second condition includes at least one of the following: having the same first identifier as the target cell, being in the same first list as the target cell. The third condition includes at least one of the following: having a different first identifier than the source cell, being in a different first list than the source cell.

[0133] In the embodiment of the present application, the terminal can determine whether the LTM switching is an Inter-CU switching according to whether the target cell meets the first condition. If it is an Inter-CU switching, the Inter-CU switching cannot be continued subsequently, but the Intra-CU switching can continue. The terminal can release the LTM candidate cell configuration of all Inter-CUs, that is, release the LTM candidate cell configuration that does not meet the second condition or the third condition, so as to avoid subsequent switching to an unavailable LTM candidate cell.

[0134] It can be understood that for Inter-CU LTM switching that supports partial continuity, after the Inter-CU switching is completed, the terminal can determine the CU change and release the LTM candidate cell configuration provided by the CU other than the target CU (that is, the CU different from the target cell), that is, the above-mentioned LTM candidate cell configuration that does not meet the second condition or the third condition.

[0135] Optionally, in another embodiment of the present application, the first rule includes indication information. The step 202 may be implemented by any one of the following steps 202d to 202f.

[0136] Step 202d: Upon receiving the first indication information, the terminal releases all LTM candidate cell configurations in the at least one LTM candidate cell configuration.

[0137] The first indication information is used to instruct the terminal to release all LTM candidate cell configurations.

[0138] It can be understood that for inter-CU LTM switching that is not supported continuously, after the inter-CU switching is completed, the target CU instructs the UE to release all LTM candidate cell configurations.

[0139] In an embodiment of the present application, the target CU determines whether the LTM switching is an Inter-CU switching. If it is an Inter-CU switching, the LTM switching cannot be executed continuously, and the target cell or target CU instructs the terminal to release all LTM candidate cell configurations to avoid subsequent switching to an unavailable LTM candidate cell.

[0140] Step 202e: The terminal releases at least part of the at least one LTM candidate cell configuration according to the second indication information.

[0141] The second indication information is used to indicate the configuration of the LTM candidate cell to be released.

[0142] Optionally, in an embodiment of the present application, the second indication information includes an identifier of the LTM candidate cell configuration to be released. Alternatively, the second indication information instructs the terminal to release the LTM candidate cell configuration that satisfies a fourth condition, wherein the fourth condition includes at least one of the following: the candidate cell and the target cell have different first identifiers, and the candidate cell and the target cell are in different first lists.

[0143] It can be understood that, when the second indication information includes the identifiers of the LTM candidate cell configurations to be released, the terminal can release the LTM candidate cell configurations corresponding to these identifiers and retain the remaining LTM candidate cell configurations. Alternatively, when the second indication information instructs the terminal to release the LTM candidate cell configurations that meet the fourth condition, the terminal can release the LTM candidate cell configurations that meet the fourth condition and retain the remaining LTM candidate cell configurations.

[0144] In an embodiment of the present application, the target CU can determine whether the LTM switching is an Inter-CU switching. If it is an Inter-CU switching, the Inter-CU switching cannot be continued subsequently, but the Intra-CU switching can continue. The target cell or target CU can instruct the terminal to release the LTM candidate cell configuration of all Inter-CUs, that is, the second indication information indicates the LTM candidate cell configuration that needs to be released to avoid subsequent switching to an unavailable LTM candidate cell.

[0145] It can be understood that for supporting partially continuous Inter-CU LTM switching, after the Inter-CU switching is completed, the target CU instructs the terminal to release the LTM candidate cell configuration provided by CUs other than the target CU, and retain the candidate cell configuration of the target CU for subsequent Intra-CU switching.

[0146] Step 202f: The terminal reserves at least part of the at least one LTM candidate cell configuration according to the third indication information.

[0147] The third indication information is used to indicate the LTM candidate cell configuration that needs to be retained.

[0148] Optionally, in an embodiment of the present application, the third indication information includes an identifier of the LTM candidate cell configuration to be retained. Alternatively, the third indication information instructs the terminal to retain the LTM candidate cell configuration that satisfies the fifth condition, and the fifth condition includes at least one of the following: the candidate cell and the target cell have the same first identifier, and the candidate cell and the target cell are in the same first list.

[0149] It can be understood that, when the third indication information contains identifiers of LTM candidate cell configurations that need to be retained, the terminal can retain the LTM candidate cell configurations corresponding to these identifiers and release the remaining LTM candidate cell configurations. Alternatively, when the third indication information indicates that the terminal retains the LTM candidate cell configurations that meet the fifth condition, the terminal can retain the LTM candidate cell configurations that meet the fifth condition and release the remaining LTM candidate cell configurations.

[0150] In an embodiment of the present application, the target CU can determine whether the LTM switching is an Inter-CU switching. If it is an Inter-CU switching, the Inter-CU switching cannot be continued subsequently, but the Intra-CU switching can continue. The target cell or target CU can instruct the terminal to retain the candidate cell configuration of the target CU for subsequent Intra-CU switching, that is, the LTM candidate cell configuration that needs to be retained as indicated by the third indication information, and release the LTM candidate cell configuration provided by the CU other than the target CU to avoid subsequent switching to an unavailable LTM candidate cell.

[0151] Optionally, in an embodiment of the present application, before the above step 202, the cell switching processing method provided in the embodiment of the present application may further include at least one of the following steps 203a to 203c.

[0152] Step 203a: When receiving the LTM switching command or satisfying the first execution condition, the terminal determines the LTM candidate cell configuration of the target cell from at least one LTM candidate cell configuration, and performs LTM switching to the target cell according to the LTM candidate cell configuration of the target cell.

[0153] In the embodiment of the present application, the above-mentioned LTM switching command includes an identifier of the target cell or the target cell configuration, and the above-mentioned first execution condition is an execution condition of the LTM switching.

[0154] Optionally, in the embodiment of the present application, after receiving the LTM switching command (LTM Command MAC CE) from the source DU, the terminal may perform LTM switching. Alternatively, the terminal evaluates the execution condition and performs LTM switching when the condition is met.

[0155] Step 203b: When receiving the layer 3 handover command, the terminal performs layer 3 handover to the target cell.

[0156] In the embodiment of the present application, the above-mentioned layer 3 switching command includes the identifier of the target cell.

[0157] Step 203c: When the second execution condition is met, the terminal performs conditional switching to the target cell.

[0158] In the embodiment of the present application, the second execution condition is the execution condition of CHO.

[0159] Optionally, in an embodiment of the present application, the above-mentioned execution conditions may include at least one of the following: the quality of the serving cell is higher than a threshold, the quality of the serving cell is lower than a threshold, the quality of the candidate cell is higher than the serving cell by an offset value, and the quality of the candidate cell is higher than the threshold.

[0160] An embodiment of the present application provides a method for processing cell switching. After switching to the target cell, the terminal can release or retain at least part of the LTM candidate cell configuration according to a first rule. The first rule includes whether the target cell satisfies the first condition, or includes indication information sent by the target cell. In this scheme, the terminal can determine whether the switching is an Inter-CU switching by judging whether the target cell meets the first condition, so as to decide the LTM candidate cell configuration that needs to be released or retained according to the judgment result; or, the terminal can decide the LTM candidate cell configuration that needs to be released or retained according to the indication of the indication information sent by the target cell. The indication information is sent to the terminal after the target CU determines whether the switching is an Inter-CU switching. In this way, after the Inter-CU switching occurs, the terminal can decide autonomously or release or retain at least part of the LTM candidate cell configuration according to the indication of the indication information, which can avoid subsequent switching to an unavailable LTM candidate cell, thereby avoiding the failure of the terminal's wireless link and improving the accuracy of the cell switching.

[0161] The present application also provides a method for processing a cell handover. Figure 5 FIG. 1 is a flow chart showing a method for processing a cell handover provided in an embodiment of the present application. Figure 5 As shown, the cell switching processing method provided in the embodiment of the present application may include the following steps 301 to 304.

[0162] Step 301: The terminal obtains at least one LTM candidate cell configuration.

[0163] Step 302: The terminal performs handover to the target cell.

[0164] It should be noted that for the relevant description of the above step 301 and step 302, reference may be made to the description in the above embodiment, which will not be repeated here.

[0165] Step 303: When confirming that the terminal switches to the target cell, the target CU sends indication information to the terminal.

[0166] In the embodiment of the present application, the above indication information is used to release or retain at least part of the LTM candidate cell configuration in at least one LTM candidate cell configuration.

[0167] Step 304: The terminal receives indication information from the target CU, and releases or reserves at least part of the at least one LTM candidate cell configuration according to the indication information.

[0168] Optionally, in an embodiment of the present application, the above indication information is used to indicate the LTM candidate cell configuration to be released. The above indication information includes the identifier of the LTM candidate cell configuration to be released; or, the above indication information indicates that the terminal releases the LTM candidate cell configuration that meets the fourth condition, and the fourth condition includes at least one of the following: the candidate cell and the target cell have different first identifiers, and the candidate cell and the target cell are in different first lists. The first identifier or the first list is used to determine whether to perform PDCP reconstruction and key change during switching.

[0169] Optionally, in an embodiment of the present application, the above indication information is used to indicate the LTM candidate cell configuration that needs to be retained. The above indication information includes an identifier of the LTM candidate cell configuration that needs to be retained; or the above indication information instructs the terminal to retain the LTM candidate cell configuration that meets the fifth condition, and the fifth condition includes at least one of the following: the candidate cell and the target cell have the same first identifier, and the candidate cell and the target cell are in the same first list. The first identifier or the first list is used to determine whether to perform PDCP reconstruction and key change during switching.

[0170] Optionally, the cell switching processing method provided in the embodiment of the present application also includes the following step 305.

[0171] Step 305: The target CU determines the identifier of the LTM candidate cell configuration to be released or to be retained according to the first information from the source CU.

[0172] In this embodiment of the present application, the first information includes at least one of the following:

[0173] Configuration identification of each LTM candidate cell;

[0174] The PCI and frequency associated with the configuration identifier of each LTM candidate cell;

[0175] The Cell Global Identifier (CGI) associated with the configuration identifier of each LTM candidate cell;

[0176] A first identifier associated with each LTM candidate cell;

[0177] The identifier of the first list to which each LTM candidate cell belongs.

[0178] In an embodiment of the present application, the source CU may send the first information to all LTM candidate cells or all candidate CUs, where all LTM candidate cells are LTM candidate cells configured by the source CU for the terminal. Alternatively, the source CU may send the first information to the target cell or target CU. Thus, the target CU determines the identifier of the LTM candidate cell configuration to be released or to be retained based on the first information, so as to send the above indication information to the terminal.

[0179] It should be noted that the above step 305 may be performed before the above step 303, or may be performed after confirming that the terminal switches to the target cell and before sending the first indication information to the terminal.

[0180] Optionally, in the embodiment of the present application, the “sending instruction information to the terminal” in the above step 303 can be specifically implemented through the following step 303a.

[0181] Step 303a: When the target cell does not satisfy the first condition, the target CU sends indication information to the terminal.

[0182] In the embodiment of the present application, the first condition includes at least one of the following:

[0183] The target cell and the source cell have the same first identifier, and the first identifier is used to determine whether to perform PDCP reestablishment and key change during handover;

[0184] The target cell and the source cell are in the same first list, and the first list is used to determine whether to perform PDCP reestablishment and key change during handover;

[0185] The primary cell configuration or primary cell group configuration of the target cell does not include a master key change indication, and the master key change indication is used to indicate that the terminal needs to change the master key during the process of switching the primary cell to the target cell;

[0186] The primary and secondary cell configuration or the secondary cell group configuration of the target cell does not include a secondary key change indication, and the secondary key change indication is used to indicate that the terminal needs to change the secondary key during the process of switching the primary and secondary cells to the target cell.

[0187] It can be understood that when the target cell does not meet the first condition, the target CU determines that the switch is an Inter-CU switch, and the LTM switch cannot be executed continuously. The target CU can send an indication message to the terminal to instruct the terminal to release or retain the LTM candidate cell configuration to avoid subsequent switching to an unavailable LTM candidate cell.

[0188] It should be noted that the specific scheme of the indication information instructing the terminal to release or retain the LTM candidate cell configuration is described in the above embodiment and will not be repeated here.

[0189] Optionally, in the embodiment of the present application, the “sending instruction information to the terminal” in the above step 303 or step 303a can be specifically implemented by the following step 303b.

[0190] Step 303b: The target CU sends indication information to the terminal through an RRC reconfiguration message or a Media Access Control-Control Element (MAC CE) signaling.

[0191] The embodiment of the present application provides a method for processing cell switching, in which the target CU sends an indication message to the terminal when confirming that the terminal has completed switching to the target cell, so that the terminal can release or retain at least part of the LTM candidate cell configuration according to the indication message. In this scheme, after the Inter-CU switching occurs, the target CU can indicate to the terminal through the indication message the LTM candidate cell configuration to be released or retained, so that the terminal can decide the LTM candidate cell configuration to be released or retained according to the indication of the indication message, thereby avoiding subsequent switching to an unavailable LTM candidate cell, avoiding the failure of the terminal's wireless link, and improving the accuracy of the cell switching.

[0192] The present application also provides a method for processing a cell handover. Figure 6 FIG. 1 is a flow chart showing a method for processing a cell handover provided in an embodiment of the present application. Figure 6 As shown, the cell switching processing method provided in the embodiment of the present application may include the following steps 401 to 403.

[0193] Step 401: A source CU sends first information to a first CU.

[0194] In the embodiment of the present application, the first CU is all candidate CUs or target CUs. The first information is used by the target CU to send first indication information to the terminal, and the indication information is used to release or retain at least part of the LTM candidate cell configurations in at least one LTM candidate cell configuration.

[0195] In this embodiment of the present application, the first information includes at least one of the following:

[0196] Configuration identification of each LTM candidate cell;

[0197] The PCI and frequency associated with the configuration identifier of each LTM candidate cell;

[0198] The CGI associated with the configuration identifier of each LTM candidate cell;

[0199] A first identifier associated with each LTM candidate cell;

[0200] The identifier of the first list to which each LTM candidate cell belongs.

[0201] Optionally, in the embodiment of the present application, the above step 401 can be specifically implemented by the following step 401a or step 401b.

[0202] Step 401a: Before initiating LTM switching, the source CU sends first information to all candidate CUs.

[0203] It can be understood that during the switching preparation process, the source CU can send the first information to all candidate CUs.

[0204] Step 401b: When the LTM switching is initiated or the LTM switching is completed, the source CU sends the first information to the target CU.

[0205] In the embodiment of the present application, the above-mentioned initiation of LTM switching can be understood as after the LTM switching command is sent.

[0206] Step 402: The target CU sends first indication information to the terminal according to the first information.

[0207] In an embodiment of the present application, the target CU can determine the identifier of the LTM candidate cell configuration to be released or to be retained based on the first information, and send the above-mentioned indication information to the terminal to instruct the terminal to release or retain the LTM candidate cell configuration to avoid subsequent switching to an unavailable LTM candidate cell.

[0208] Step 403: The terminal receives indication information from the target CU, and releases or reserves at least part of the at least one LTM candidate cell configuration according to the indication information.

[0209] Optionally, in an embodiment of the present application, the above indication information is used to indicate the LTM candidate cell configuration to be released. The above indication information includes the identifier of the LTM candidate cell configuration to be released; or, the above indication information indicates that the terminal releases the LTM candidate cell configuration that meets the fourth condition, and the fourth condition includes at least one of the following: the candidate cell and the target cell have different first identifiers, and the candidate cell and the target cell are in different first lists. The first identifier or the first list is used to determine whether to perform PDCP reconstruction and key change during switching.

[0210] Optionally, in an embodiment of the present application, the above indication information is used to indicate the LTM candidate cell configuration that needs to be retained. The above indication information includes an identifier of the LTM candidate cell configuration that needs to be retained; or the above indication information instructs the terminal to retain the LTM candidate cell configuration that meets the fifth condition, and the fifth condition includes at least one of the following: the candidate cell and the target cell have the same first identifier, and the candidate cell and the target cell are in the same first list. The first identifier or the first list is used to determine whether to perform PDCP reconstruction and key change during switching.

[0211] It should be noted that the specific scheme of the above indication information instructing the terminal to release or retain the LTM candidate cell configuration can be found in the description in the above embodiment and will not be repeated here.

[0212] Optionally, the cell switching processing method provided in the embodiment of the present application also includes the following step 404.

[0213] Step 404: The source CU sends at least one LTM candidate cell configuration to the terminal.

[0214] In the embodiment of the present application, the above-mentioned LTM candidate cell configuration includes at least one of the following:

[0215] Layer 1 measurement configuration associated with the LTM candidate cell;

[0216] The cell configuration applied when the terminal accesses the LTM candidate cell;

[0217] TCI status configuration associated with LTM candidate cells;

[0218] RACH configuration associated with the LTM candidate cell.

[0219] It should be noted that the above step 404 can be performed before the above step 401.

[0220] An embodiment of the present application provides a method for processing cell switching, where the source CU can send first information to all candidate CUs or target CUs, so that the target CU sends first indication information to the terminal, so that the terminal releases or retains at least part of the LTM candidate cell configuration. In this solution, the source CU can send first information to all candidate CUs or target CUs, so that the target CU can determine the identifier of the LTM candidate cell configuration to be released or retained based on the first information, so that after the Inter-CULTM switching occurs, the indication information is sent to the terminal, so that the terminal can determine the LTM candidate cell configuration that needs to be released or retained based on the indication of the indication information, thereby avoiding subsequent switching to an unavailable LTM candidate cell, thereby avoiding the failure of the terminal's wireless link and improving the accuracy of cell switching.

[0221] The present application also provides a method for processing a cell handover. Figure 7 FIG. 1 is a flow chart showing a method for processing a cell handover provided in an embodiment of the present application. Figure 7 As shown, the cell switching processing method provided in the embodiment of the present application may include the following steps 501 and 502.

[0222] Step 501: When confirming that the terminal switches to the target cell, the target CU sends second information to the target DU.

[0223] Step 502: The target DU receives second information from the target CU.

[0224] In an embodiment of the present application, the source CU can provide at least one LTM candidate cell configuration for the terminal; the source DU can send an LTM switching command to the terminal, instructing the terminal to switch to the LTM target cell of the target CU; when the target CU confirms that the terminal has switched to the target cell, it sends a second message to the target DU.

[0225] In this embodiment of the present application, the second information includes at least one of the following:

[0226] The second indication information is used to instruct to stop sending the LTM switching command to the terminal;

[0227] A list of identifiers of candidate target cells.

[0228] Optionally, in an embodiment of the present application, the above-mentioned candidate target cell identification list is used to indicate that the target DU is allowed to send an LTM switching command to the terminal, so that the terminal switches to the candidate target cell corresponding to the identification list.

[0229] Optionally, in an embodiment of the present application, the above-mentioned candidate target cell identification list is used to instruct the target DU to stop sending LTM switching commands to the terminal, so that the terminal switches to the candidate target cell corresponding to the identification list.

[0230] It can be understood that after receiving the second indication information, the target DU can stop sending the LTM switching command to the terminal, that is, the switching command to switch to other CUs, so that the terminal stops executing the LTM switching to other CUs until the key reconfiguration is completed.

[0231] After receiving the candidate target cell identification list, the target DU may send an LTM switching command to the terminal to instruct the terminal to switch to the candidate target cell corresponding to the identification list until the key reconfiguration is completed.

[0232] After receiving the candidate target cell identifier list, the target DU may stop sending the LTM switching command to the terminal, so that the terminal switches to the candidate target cell corresponding to the identifier list until the key reconfiguration is completed.

[0233] Optionally, in the embodiment of the present application, after the above step 502, the cell switching processing method provided in the embodiment of the present application further includes the following step 503.

[0234] Step 503: After completing the reconfiguration of the candidate cell key of the terminal, the target CU sends the third information to the target DU.

[0235] In this embodiment of the present application, the third information includes at least one of the following:

[0236] The third indication information is used to instruct the target DU to resume or restart sending an LTM switching command to the terminal;

[0237] A second list of candidate target cells.

[0238] Optionally, in an embodiment of the present application, the second list is used to indicate that the target DU is allowed to send an LTM switching command to the terminal, so that the terminal switches to the candidate target cell corresponding to the second list.

[0239] Optionally, in an embodiment of the present application, the above-mentioned second list is used to instruct the target DU to resume or restart sending an LTM switching command to the terminal, so that the terminal switches to the candidate target cell corresponding to the second list.

[0240] It can be understood that after receiving the third indication information, the target DU can resume or restart sending the LTM switching command to the terminal, that is, the switching command to switch to other CUs, so that the terminal continues to perform LTM switching to other CUs.

[0241] After receiving the second list of candidate target cells, the target DU may send an LTM switching command to the terminal to instruct the terminal to switch to the candidate target cell corresponding to the second list.

[0242] After receiving the second list of candidate target cells, the target DU may resume or restart sending the LTM switching command to the terminal, so that the terminal switches to the candidate target cell corresponding to the second list.

[0243] Optionally, in an embodiment of the present application, the second list may include an identifier list of candidate target cells, or may include a PCI and frequency (ie, PCI+frequency) list.

[0244] In an embodiment of the present application, after the target CU sends the second information to the target DU, the target CU derives the candidate cell key and reconfigures the candidate cell key of the terminal; after the reconfiguration is completed, the target CU sends the third information to the target DU.

[0245] It can be understood that for supporting all continuous Inter-CU LTM switching, after the Inter-CU switching is completed, the target DU can stop sending switching commands to other CUs until the key reconfiguration is completed.

[0246] Optionally, in the embodiment of the present application, the cell switching processing method provided in the embodiment of the present application also includes the following step 504.

[0247] Step 504: The target CU determines a list of identifiers of candidate target cells according to the first information from the source CU.

[0248] In this embodiment of the present application, the first information includes at least one of the following:

[0249] Configuration identification of each LTM candidate cell;

[0250] The PCI and frequency associated with the configuration identifier of each LTM candidate cell;

[0251] The CGI associated with the configuration identifier of each LTM candidate cell;

[0252] A first identifier associated with each LTM candidate cell;

[0253] The identifier of the first list to which each LTM candidate cell belongs.

[0254] Optionally, in an embodiment of the present application, before initiating LTM switching (i.e., during the switching preparation process), the source CU may send the first information to all candidate CUs. When initiating LTM switching or when LTM switching is completed, the source CU may send the first information to the target CU. Thus, the target CU determines the identifier list of the candidate target cells based on the first information.

[0255] It should be noted that the above step 504 may be performed before the above step 501, or may be performed after confirming that the terminal switches to the target cell and before sending the second information to the target DU.

[0256] An embodiment of the present application provides a method for processing cell switching, in which the target CU sends a second message to the target DU when confirming that the terminal switches to the target cell, and the second message includes at least one of the following: a second indication message instructing to stop sending the LTM switching command to the terminal, and an identification list of candidate target cells. In this scheme, after the Inter-CU switching occurs, the target CU sends an indication to the target DU to stop sending the LTM switching command to the terminal, so that the target DU stops issuing the switching command to switch to other CUs, or the target CU sends an identification list of candidate target cells to the target DU, so that the terminal switches to the candidate target cell corresponding to the identification list. In this way, the full continuity of the Inter-CU switching is achieved, that is, the terminal can continue to execute the switch to the corresponding candidate cell, which can avoid the failure of the terminal's wireless link, thereby improving the accuracy of the cell switching.

[0257] Each of the above-mentioned method embodiments, or various possible implementation methods in each method embodiment can be executed separately, or any two or more of them can be executed in combination with each other. The specific implementation method can be determined according to actual usage requirements, and the embodiments of the present application do not limit this.

[0258] The cell handover processing method provided in the embodiment of the present application may be executed by a cell handover processing device. The cell handover processing method performed by a cell handover processing device in the embodiment of the present application is taken as an example to illustrate the cell handover processing device provided in the embodiment of the present application.

[0259] Figure 8 A possible structural diagram of a cell switching processing device involved in an embodiment of the present application is shown. Figure 8 As shown, the cell switching processing device 40 may include: an acquisition module 41 and a processing module 42.

[0260] The acquisition module 41 is used to acquire at least one LTM candidate cell configuration. The processing module 42 is used to release or retain at least part of the at least one LTM candidate cell configuration according to a first rule when switching to a target cell. The first rule includes any one of the following: whether the target cell meets the first condition; indication information sent by the target cell.

[0261] An embodiment of the present application provides a cell switching processing device, which can determine whether the switch is an Inter-CU switch by judging whether the target cell satisfies a first condition, and decides the LTM candidate cell configuration that needs to be released or retained according to the judgment result; or, the cell switching processing device can determine the LTM candidate cell configuration that needs to be released or retained according to the indication of the indication information sent by the target cell, and the indication information is sent by the target CU after judging whether the switch is an Inter-CU switch. In this way, after the Inter-CU switch occurs, the cell switching processing device can independently decide or release or retain at least part of the LTM candidate cell configuration according to the indication of the indication information, which can avoid subsequent switching to an unavailable LTM candidate cell, thereby avoiding the failure of the wireless link of the cell switching processing device and improving the accuracy of the cell switching.

[0262] In a possible implementation, the first condition includes at least one of the following:

[0263] The target cell and the source cell have the same first identifier, and the first identifier is used to determine whether to perform PDCP reestablishment and key change during handover;

[0264] The target cell and the source cell are in the same first list, and the first list is used to determine whether to perform PDCP reestablishment and key change during handover;

[0265] The primary cell configuration or primary cell group configuration of the target cell does not include a master key change indication, and the master key change indication is used to indicate that the terminal needs to change the master key during the process of switching the primary cell to the target cell;

[0266] The primary and secondary cell configuration or the secondary cell group configuration of the target cell does not include a secondary key change indication, and the secondary key change indication is used to indicate that the terminal needs to change the secondary key during the process of switching the primary and secondary cells to the target cell.

[0267] In one possible implementation, the first rule includes whether the target cell satisfies the first condition; the processing module 42 is specifically used to: when the target cell satisfies the first condition, retain all LTM candidate cell configurations in at least one LTM candidate cell configuration; or, when the target cell does not satisfy the first condition, release all LTM candidate cell configurations in at least one LTM candidate cell configuration.

[0268] In a possible implementation, the first rule includes whether the target cell satisfies the first condition; the processing module 42 is specifically used to retain at least one LTM candidate cell configuration that satisfies the second condition or the third condition in the target cell when the target cell does not satisfy the first condition, and release the remaining LTM candidate cell configurations; wherein the second condition includes at least one of the following: having the same first identifier as the target cell and being in the same first list as the target cell; the third condition includes at least one of the following: having a different first identifier from the source cell and being in a different first list from the source cell.

[0269] In a possible implementation, the first rule includes indication information; the processing module 42 is specifically used to release all LTM candidate cell configurations in at least one LTM candidate cell configuration upon receiving the first indication information, and the first indication information is used to instruct the terminal to release all LTM candidate cell configurations.

[0270] In a possible implementation, the first rule includes indication information; the processing module 42 is specifically used to release at least part of the LTM candidate cell configuration in at least one LTM candidate cell configuration according to the second indication information, and the second indication information is used to indicate the LTM candidate cell configuration to be released.

[0271] In one possible implementation, the second indication information includes an identifier of the LTM candidate cell configuration to be released; or, the second indication information instructs the terminal to release the LTM candidate cell configuration that satisfies a fourth condition, and the fourth condition includes at least one of the following: the candidate cell and the target cell have different first identifiers, and the candidate cell and the target cell are in different first lists.

[0272] In a possible implementation, the first rule includes first indication information; the processing module 42 is specifically used to retain at least part of the LTM candidate cell configuration in at least one LTM candidate cell configuration according to third indication information, and the third indication information is used to indicate the LTM candidate cell configuration that needs to be retained.

[0273] In one possible implementation, the third indication information includes an identifier of the LTM candidate cell configuration that needs to be retained; or, the third indication information instructs the terminal to retain the LTM candidate cell configuration that meets the fifth condition, and the fifth condition includes at least one of the following: the candidate cell and the target cell have the same first identifier, and the candidate cell and the target cell are in the same first list.

[0274] In a possible implementation manner, the LTM candidate cell configuration includes at least one of the following:

[0275] Layer 1 measurement configuration associated with the LTM candidate cell;

[0276] The cell configuration applied when the terminal accesses the LTM candidate cell;

[0277] TCI status configuration associated with LTM candidate cells;

[0278] RACH configuration associated with the LTM candidate cell.

[0279] In a possible implementation, the cell switching processing device 40 provided in the embodiment of the present application also includes an execution module. The execution module is used to determine the LTM candidate cell configuration of the target cell from at least one LTM candidate cell configuration when receiving an LTM switching command or satisfying a first execution condition, and execute LTM switching to the target cell according to the LTM candidate cell configuration of the target cell, wherein the LTM switching command includes an identifier of the target cell or the target cell configuration, and the first execution condition is an execution condition of LTM switching. Alternatively, the execution module is used to execute a layer 3 switching to the target cell when receiving a layer 3 switching command, wherein the layer 3 switching command includes an identifier of the target cell. Alternatively, the execution module is used to execute a conditional switching to the target cell when a second execution condition is satisfied, and the second execution condition is an execution condition of CHO.

[0280] The cell switching processing device in the embodiment of the present application may 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 a chip. The electronic device may be a terminal, or may be other devices other than a terminal. Exemplarily, the terminal may include but is not limited to the types of the terminal 11 listed above, and other devices may be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiment of the present application.

[0281] The cell switching processing device provided in the embodiment of the present application can implement the various processes implemented by the above-mentioned terminal side method embodiment and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0282] Fig. 9 FIG. 2 shows another possible structural diagram of a cell switching processing device involved in an embodiment of the present application. Fig. 9 As shown, the cell switching processing device 50 may include: a sending module 51.

[0283] The sending module 51 is used to send first indication information to the terminal when confirming that the terminal switches to the target cell; wherein the first indication information is used to release or retain at least part of the LTM candidate cell configuration in at least one LTM candidate cell configuration.

[0284] An embodiment of the present application provides a cell switching processing device. After Inter-CU switching occurs, the cell switching processing device can indicate to the terminal through indication information to release or retain the LTM candidate cell configuration, so that the terminal can decide the LTM candidate cell configuration that needs to be released or retained according to the indication of the indication information, thereby avoiding subsequent switching to an unavailable LTM candidate cell, avoiding wireless link failure of the terminal, and improving the accuracy of cell LTM switching.

[0285] In a possible implementation, the above-mentioned indication information is used to indicate the LTM candidate cell configuration to be released. The indication information includes the identifier of the LTM candidate cell configuration to be released; or the indication information instructs the terminal to release the LTM candidate cell configuration that meets the fourth condition, and the fourth condition includes at least one of the following: the candidate cell and the target cell have different first identifiers, and the candidate cell and the target cell are in different first lists; the first identifier or the first list is used to determine whether to perform PDCP reconstruction and key change during switching.

[0286] In a possible implementation, the above-mentioned indication information is used to indicate the LTM candidate cell configuration that needs to be retained. The indication information includes the identifier of the LTM candidate cell configuration that needs to be retained; or the indication information instructs the terminal to retain the LTM candidate cell configuration that meets the fifth condition, and the fifth condition includes at least one of the following: the candidate cell and the target cell have the same first identifier, and the candidate cell and the target cell are in the same first list; the first identifier or the first list is used to determine whether to perform PDCP reconstruction and key change during switching.

[0287] In one possible implementation, combining Fig. 9 ,like Fig.10 As shown, the cell switching processing device 50 provided in the embodiment of the present application further includes: a determination module 52. The determination module 52 is used to determine the identifier of the LTM candidate cell configuration to be released or to be retained according to the first information from the source CU;

[0288] The first information includes at least one of the following:

[0289] Configuration identification of each LTM candidate cell;

[0290] The PCI and frequency associated with the configuration identifier of each LTM candidate cell;

[0291] The CGI associated with the configuration identifier of each LTM candidate cell;

[0292] A first identifier associated with each LTM candidate cell;

[0293] The identifier of the first list to which each LTM candidate cell belongs.

[0294] In a possible implementation, the sending module 51 is specifically configured to send indication information to the terminal when the target cell does not meet the first condition;

[0295] The first condition includes at least one of the following:

[0296] The target cell and the source cell have the same first identifier, and the first identifier is used to determine whether to perform PDCP reestablishment and key change during handover;

[0297] The target cell and the source cell are in the same first list, and the first list is used to determine whether to perform PDCP reestablishment and key change during handover;

[0298] The primary cell configuration or primary cell group configuration of the target cell does not include a master key change indication, and the master key change indication is used to indicate that the terminal needs to change the master key during the process of switching the primary cell to the target cell;

[0299] The primary and secondary cell configuration or the secondary cell group configuration of the target cell does not include a secondary key change indication, and the secondary key change indication is used to indicate that the terminal needs to change the secondary key during the process of switching the primary and secondary cells to the target cell.

[0300] In a possible implementation, the sending module 51 is specifically configured to send indication information to the terminal through an RRC reconfiguration message or a MACCE signaling.

[0301] In a possible implementation manner, the LTM candidate cell configuration includes at least one of the following:

[0302] Layer 1 measurement configuration associated with the LTM candidate cell;

[0303] The cell configuration applied when the terminal accesses the LTM candidate cell;

[0304] TCI status configuration associated with LTM candidate cells;

[0305] RACH configuration associated with the LTM candidate cell.

[0306] The cell switching processing device provided in the embodiment of the present application can implement the various processes implemented by the above-mentioned target CU side method embodiment and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0307] Fig.11 FIG. 2 shows another possible structural diagram of a cell switching processing device involved in an embodiment of the present application. Fig.11 As shown, the cell switching processing device 60 may include: a sending module 61.

[0308] The sending module 61 is used to send first information to the first CU, where the first CU is all candidate CUs or target CUs, and the first information is used for the target CU to send indication information to the terminal, where the indication information is used to release or retain at least part of the LTM candidate cell configurations in at least one LTM candidate cell configuration; wherein the first information includes at least one of the following:

[0309] Configuration identification of each LTM candidate cell;

[0310] The PCI and frequency associated with the configuration identifier of each LTM candidate cell;

[0311] The CGI associated with the configuration identifier of each LTM candidate cell;

[0312] A first identifier associated with each LTM candidate cell;

[0313] The identifier of the first list to which each LTM candidate cell belongs.

[0314] An embodiment of the present application provides a cell switching processing device, which can send first information to all candidate CUs or target CUs, so that the target CU can determine the identifier of the LTM candidate cell configuration to be released or to be retained based on the first information, and send first indication information to the terminal after the Inter-CU LTM switching occurs, so that the terminal can decide the LTM candidate cell configuration to be released or retained based on the indication of the indication information, thereby avoiding subsequent switching to an unavailable LTM candidate cell and improving the accuracy of the LTM switching processing.

[0315] In a possible implementation, the sending module 61 is specifically configured to send the first information to all candidate CUs before initiating the LTM switch; or, when the LTM switch is initiated or the LTM switch is completed, send the first information to the target CU.

[0316] In a possible implementation, the above-mentioned indication information is used to indicate the LTM candidate cell configuration to be released. The indication information includes the identifier of the LTM candidate cell configuration to be released; or the indication information instructs the terminal to release the LTM candidate cell configuration that meets the fourth condition, and the fourth condition includes at least one of the following: the candidate cell and the target cell have different first identifiers, and the candidate cell and the target cell are in different first lists; the first identifier or the first list is used to determine whether to perform PDCP reconstruction and key change during switching.

[0317] In a possible implementation, the above-mentioned indication information is used to indicate the LTM candidate cell configuration that needs to be retained. The indication information includes the identifier of the LTM candidate cell configuration that needs to be retained; or the indication information instructs the terminal to retain the LTM candidate cell configuration that meets the fifth condition, and the fifth condition includes at least one of the following: the candidate cell and the target cell have the same first identifier, and the candidate cell and the target cell are in the same first list; the first identifier or the first list is used to determine whether to perform PDCP reconstruction and key change during switching.

[0318] In a possible implementation, the sending module 61 is further configured to send at least one LTM candidate cell configuration to the terminal;

[0319] The LTM candidate cell configuration includes at least one of the following:

[0320] Layer 1 measurement configuration associated with the LTM candidate cell;

[0321] The cell configuration applied when the terminal accesses the LTM candidate cell;

[0322] TCI status configuration associated with LTM candidate cells;

[0323] RACH configuration associated with the LTM candidate cell.

[0324] The cell switching processing device provided in the embodiment of the present application can implement the various processes implemented by the above-mentioned source CU side method embodiment and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0325] Fig.12 FIG. 2 shows another possible structural diagram of a cell switching processing device involved in an embodiment of the present application. Fig.12 As shown, the cell switching processing device 70 may include: a sending module 71.

[0326] Among them, the sending module 71 is used to send the second information to the target DU when confirming that the terminal switches to the target cell; wherein the second information includes at least one of the following: second indication information, used to indicate to stop sending the LTM switching command to the terminal; a list of identifications of candidate target cells.

[0327] The embodiment of the present application provides a cell switching processing device. After the Inter-CU switching occurs, the cell switching processing device sends an instruction to the target DU to stop sending the LTM switching command to the terminal, so that the target DU stops issuing the switching command to switch to other CUs, or the cell switching processing device sends a candidate target cell identification list to the target DU, so that the terminal switches to the candidate target cell corresponding to the identification list. In this way, the full continuity of the Inter-CU LTM switching is achieved, that is, the terminal can continue to execute the switch to the corresponding candidate cell, avoiding the failure of the terminal's wireless link and improving the accuracy of the cell switching.

[0328] In a possible implementation, the above-mentioned candidate target cell identifier list is used to indicate that the target DU is allowed to send an LTM switching command to the terminal, so that the terminal switches to the candidate target cell corresponding to the identifier list;

[0329] or,

[0330] The above candidate target cell identification list is used to instruct the target DU to stop sending the LTM switching command to the terminal, so that the terminal can switch to the candidate target cell corresponding to the identification list.

[0331] In a possible implementation, the sending module 71 is further configured to send third information to the target DU after sending the second information to the target DU and when the reconfiguration of the candidate cell key of the terminal is completed;

[0332] The third information includes at least one of the following:

[0333] The third indication information is used to instruct the target DU to resume or restart sending an LTM switching command to the terminal;

[0334] A second list of candidate target cells.

[0335] In a possible implementation, the second list is used to indicate that the target DU is allowed to send an LTM switching command to the terminal, so that the terminal switches to the candidate target cell corresponding to the second list;

[0336] or,

[0337] The second list is used to instruct the target DU to resume or restart sending an LTM switching command to the terminal, so that the terminal switches to the candidate target cell corresponding to the second list.

[0338] In one possible implementation, combining Fig.12 ,like Fig.13 As shown, the cell switching processing device 70 provided in the embodiment of the present application further includes: a determination module 72. The determination module 72 is configured to determine a list of identifiers of candidate target cells according to the first information from the source CU;

[0339] The first information includes at least one of the following:

[0340] Configuration identification of each LTM candidate cell;

[0341] The PCI and frequency associated with the configuration identifier of each LTM candidate cell;

[0342] The CGI associated with the configuration identifier of each LTM candidate cell;

[0343] A first identifier associated with each LTM candidate cell;

[0344] The identifier of the first list to which each LTM candidate cell belongs.

[0345] The cell switching processing device provided in the embodiment of the present application can implement the various processes implemented by the above-mentioned target CU side method embodiment and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0346] like Fig.14 As shown, the embodiment of the present application also provides a communication device 5000, including a processor 5001 and a memory 5002, and the memory 5002 stores a program or instruction that can be run on the processor 5001. For example, when the communication device 5000 is a terminal, the program or instruction is executed by the processor 5001 to implement the various steps of the above-mentioned terminal side method embodiment, and can achieve the same technical effect. To avoid repetition, it is not repeated here. When the communication device 5000 is a network side device, the program or instruction is executed by the processor 5001 to implement the various steps of the above-mentioned target CU or source CU side method embodiment, and can achieve the same technical effect. To avoid repetition, it is not repeated here.

[0347] The embodiment of the present application also provides a terminal, including a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run a program or instruction to implement the steps in the above-mentioned cell switching processing method embodiment. 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 the terminal embodiment and can achieve the same technical effect. Specifically, Fig.15 A schematic diagram of the hardware structure of a terminal for implementing an embodiment of the present application.

[0348] The terminal 7000 includes but is not limited to: a radio frequency unit 7001, a network module 7002, an audio output unit 7003, an input unit 7004, a sensor 7005, a display unit 7006, a user input unit 7007, an interface unit 7008, a memory 7009 and at least some of the components of a processor 7010.

[0349] Those skilled in the art will appreciate that the terminal 7000 may also include a power source (such as a battery) for supplying power to each component, and the power source may be logically connected to the processor 7010 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Fig.15 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 described in detail here.

[0350] It should be understood that in the embodiment of the present application, the input unit 7004 may include a graphics processing unit (GPU) 70041 and a microphone 70042, and the graphics processor 70041 processes the image data of the static picture or video obtained by the image capture device (such as a camera) in the video capture mode or the image capture mode. The display unit 7006 may include a display panel 70061, and the display panel 70061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 7007 includes a touch panel 70071 and at least one of other input devices 70072. The touch panel 70071 is also called a touch screen. The touch panel 70071 may include two parts: a touch detection device and a touch controller. Other input devices 70072 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 a joystick, which will not be repeated here.

[0351] In the embodiment of the present application, after receiving downlink data from the network side device, the RF unit 7001 can transmit the data to the processor 7010 for processing; in addition, the RF unit 7001 can send uplink data to the network side device. Generally, the RF unit 7001 includes but is not limited to an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0352] The memory 7009 can be used to store software programs or instructions and various data. The memory 7009 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, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 7009 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 7009 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0353] The processor 7010 may include one or more processing units; optionally, the processor 7010 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 7010.

[0354] The terminal provided in the embodiment of the present application is capable of implementing the various processes implemented by the terminal in the above-mentioned method embodiment and achieving the same technical effect. The implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the above-mentioned cell switching processing method embodiment. To avoid repetition, it will not be repeated here.

[0355] The embodiment of the present application also provides a network side device, including a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the steps of the above-mentioned cell switching processing method embodiment. The network side device embodiment corresponds to the above-mentioned target CU or source CU side method embodiment, and each implementation process and implementation method of the above-mentioned method embodiment can be applied to the network side device embodiment, and can achieve the same technical effect.

[0356] Specifically, the embodiment of the present application also provides a network side device. Fig.16 As shown, the network side device 600 includes: an antenna 601, a radio frequency device 602, a baseband device 603, a processor 604 and a memory 605. The antenna 601 is connected to the radio frequency device 602. In the uplink direction, the radio frequency device 602 receives information through the antenna 601 and sends the received information to the baseband device 603 for processing. In the downlink direction, the baseband device 603 processes the information to be sent and sends it to the radio frequency device 602. The radio frequency device 602 processes the received information and sends it out through the antenna 601.

[0357] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 603, which includes a baseband processor.

[0358] The baseband device 603 may include, for example, at least one baseband board on which a plurality of chips are arranged. Fig.16 As shown, one of the chips is, for example, a baseband processor, which is connected to the memory 605 through a bus interface to call the program in the memory 605 to execute the network device operations shown in the above method embodiment.

[0359] The network side device may further include a network interface 606, which is, for example, a Common Public Radio Interface (CPRI).

[0360] Specifically, the network side device 600 of the embodiment of the present invention also includes: instructions or programs stored in the memory 605 and executable on the processor 604. The processor 604 calls the instructions or programs in the memory 605 to execute the methods executed by the modules shown in the above-mentioned cell switching processing device and achieve the same technical effect. To avoid repetition, it will not be described here.

[0361] 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, each process of the above-mentioned cell switching processing method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0362] 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-transient readable storage medium.

[0363] 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 cell switching processing method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0364] 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.

[0365] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium, and is executed by at least one processor to implement the various processes of the above-mentioned cell switching processing method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0366] An embodiment of the present application further provides a wireless communication system, including: a terminal and a network side device, wherein the terminal can be used to execute the steps of the above-mentioned cell switching processing method, and the network side device can be used to execute the steps of the above-mentioned cell switching processing method.

[0367] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including 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 one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the embodiment 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 reverse 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.

[0368] Through the description of the above implementation methods, 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 hardware platform, and of course, can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, disk, CD, etc.), including several instructions to enable a terminal or a network-side device to execute the methods described in each embodiment of the present application.

[0369] 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 the present application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of the present application and the scope of protection of the claims, and these implementation methods are all within the protection of the present application.

Claims

1. A method for processing a cell handover, characterized in that: include: The terminal obtains at least one layer 1 or layer 2 triggered mobility LTM candidate cell configuration; When the terminal switches to the target cell, the terminal releases or retains at least part of the LTM candidate cell configurations in the at least one LTM candidate cell configuration according to the first rule; The first rule includes any one of the following: Whether the target cell meets the first condition; The indication information sent by the target cell.

2. The method according to claim 1, characterized in that: The first condition includes at least one of the following: The target cell and the source cell have the same first identifier, and the first identifier is used to determine whether to perform packet data convergence protocol PDCP reconstruction and key change during handover; The target cell and the source cell are in the same first list, and the first list is used to determine whether to perform PDCP reestablishment and key change during handover; The primary cell configuration or the primary cell group configuration of the target cell does not include a master key change indication, and the master key change indication is used to indicate that the terminal needs to change the master key during the process of switching the primary cell to the target cell; The primary and secondary cell configuration or the secondary cell group configuration of the target cell does not include a secondary key change indication, and the secondary key change indication is used to indicate that the terminal needs to change the secondary key during the process of switching the primary and secondary cells to the target cell.

3. The method according to claim 1 or 2, characterized in that: The first rule includes whether the target cell satisfies a first condition; The terminal releases or retains at least part of the at least one LTM candidate cell configuration according to the first rule, including: When the target cell satisfies the first condition, the terminal retains all LTM candidate cell configurations in the at least one LTM candidate cell configuration; or, When the target cell does not satisfy the first condition, the terminal releases all LTM candidate cell configurations in the at least one LTM candidate cell configuration; or, In a case where the target cell does not satisfy the first condition, the terminal retains the LTM candidate cell configuration that satisfies the second condition or the third condition among the at least one LTM candidate cell configuration, and releases the remaining LTM candidate cell configurations; The second condition includes at least one of the following: having the same first identifier as the target cell and being in the same first list as the target cell; the third condition includes at least one of the following: having a different first identifier from the source cell and being in a different first list from the source cell.

4. The method according to claim 1, characterized in that: The first rule includes the indication information; The terminal releases or retains at least part of the at least one LTM candidate cell configuration according to the first rule, including: The terminal releases all LTM candidate cell configurations in the at least one LTM candidate cell configuration when receiving the first indication information, wherein the first indication information is used to instruct the terminal to release all the LTM candidate cell configurations or, The terminal releases at least part of the at least one LTM candidate cell configuration according to the second indication information, where the second indication information is used to indicate the LTM candidate cell configuration to be released; or, The terminal retains at least part of the at least one LTM candidate cell configuration according to third indication information, where the third indication information is used to indicate the LTM candidate cell configuration that needs to be retained.

5. The method according to claim 4, characterized in that The second indication information includes an identifier of the LTM candidate cell configuration to be released; or, The second indication information instructs the terminal to release the LTM candidate cell configuration that meets a fourth condition, where the fourth condition includes at least one of the following: the candidate cell and the target cell have different first identifiers, and the candidate cell and the target cell are in different first lists.

6. The method according to claim 4, characterized in that The third indication information includes an identifier of the LTM candidate cell configuration that needs to be retained; or, The third indication information instructs the terminal to retain the LTM candidate cell configuration that meets a fifth condition, where the fifth condition includes at least one of the following: the candidate cell and the target cell have the same first identifier, and the candidate cell and the target cell are in the same first list.

7. The method according to any one of claims 1 to 6, characterized in that The LTM candidate cell configuration includes at least one of the following: Layer 1 measurement configuration associated with the LTM candidate cell; The cell configuration applied when the terminal accesses the LTM candidate cell; The transmission configuration indicator TCI state configuration associated with the LTM candidate cell; The random access channel RACH configuration associated with the LTM candidate cell.

8. The method according to any one of claims 1 to 7, characterized in that The method further comprises: The terminal determines the LTM candidate cell configuration of the target cell from the at least one LTM candidate cell configuration when receiving the LTM switching command or satisfying the first execution condition, and performs LTM switching to the target cell according to the LTM candidate cell configuration of the target cell; the LTM switching command includes an identifier of the target cell or the target cell configuration, and the first execution condition is an execution condition of the LTM switching; or, The terminal performs a layer 3 handover to the target cell when receiving a layer 3 handover command, wherein the layer 3 handover command includes an identifier of the target cell; or, The terminal performs conditional handover to the target cell when a second execution condition is met, where the second execution condition is an execution condition of conditional handover CHO.

9. A method for processing cell switching, characterized in that: include: The target concentration unit CU sends indication information to the terminal when confirming that the terminal switches to the target cell; The indication information is used to release or retain at least part of the LTM candidate cell configuration in at least one layer 1 or layer 2 triggered mobility LTM candidate cell configuration.

10. The method according to claim 9, characterized in that The indication information is used to indicate the LTM candidate cell configuration to be released; The indication information includes an identifier of the LTM candidate cell configuration to be released; or, the indication information instructs the terminal to release the LTM candidate cell configuration that meets a fourth condition, and the fourth condition includes at least one of the following: the candidate cell and the target cell have different first identifiers, and the candidate cell and the target cell are in different first lists; the first identifier or the first list is used to determine whether to perform packet data convergence protocol PDCP reconstruction and key change during switching.

11. The method according to claim 9, characterized in that The indication information is used to indicate the LTM candidate cell configuration that needs to be retained; The indication information includes an identifier of the LTM candidate cell configuration that needs to be retained; or the indication information instructs the terminal to retain the LTM candidate cell configuration that meets the fifth condition, and the fifth condition includes at least one of the following: the candidate cell and the target cell have the same first identifier, and the candidate cell and the target cell are in the same first list; the first identifier or the first list is used to determine whether to perform PDCP reconstruction and key change during switching.

12. The method according to claim 10 or 11, characterized in that: The method further comprises: The target CU determines, according to the first information from the source CU, an identifier of the LTM candidate cell configuration to be released or to be retained; The first information includes at least one of the following: Configuration identification of each LTM candidate cell; The physical cell identifier PCI and frequency associated with the configuration identifier of each LTM candidate cell; The cell global identifier CGI associated with the configuration identifier of each LTM candidate cell; A first identifier associated with each LTM candidate cell; The identifier of the first list to which each LTM candidate cell belongs.

13. The method according to claim 9, characterized in that The sending the indication information to the terminal includes: When the target cell does not satisfy the first condition, the target CU sends the indication information to the terminal; The first condition includes at least one of the following: The target cell and the source cell have the same first identifier, and the first identifier is used to determine whether to perform PDCP reestablishment and key change during handover; The target cell and the source cell are in the same first list, and the first list is used to determine whether to perform PDCP reestablishment and key change during handover; The primary cell configuration or the primary cell group configuration of the target cell does not include a master key change indication, and the master key change indication is used to indicate that the terminal needs to change the master key during the process of switching the primary cell to the target cell; The primary and secondary cell configuration or the secondary cell group configuration of the target cell does not include a secondary key change indication, and the secondary key change indication is used to indicate that the terminal needs to change the secondary key during the process of switching the primary and secondary cells to the target cell.

14. The method according to any one of claims 9 to 13, characterized in that The sending the indication information to the terminal includes: The target CU sends the indication information to the terminal through a radio resource control RRC reconfiguration message or a media access control unit MAC CE signaling.

15. The method according to any one of claims 9 to 14, characterized in that The LTM candidate cell configuration includes at least one of the following: Layer 1 measurement configuration associated with the LTM candidate cell; The cell configuration applied when the terminal accesses the LTM candidate cell; The transmission configuration indicator TCI state configuration associated with the LTM candidate cell; The random access channel RACH configuration associated with the LTM candidate cell.

16. A method for processing cell switching, characterized in that: include: The source centralized unit CU sends first information to the first CU, where the first CU is all candidate CUs or target CUs, and the first information is used by the target CU to send indication information to the terminal, where the indication information is used to release or retain at least part of the LTM candidate cell configurations in the mobility LTM candidate cell configuration triggered by at least one layer 1 or layer 2; The first information includes at least one of the following: Configuration identification of each LTM candidate cell; The physical cell identifier PCI and frequency associated with the configuration identifier of each LTM candidate cell; The cell global identifier CGI associated with the configuration identifier of each LTM candidate cell; A first identifier associated with each LTM candidate cell; The identifier of the first list to which each LTM candidate cell belongs.

17. The method according to claim 16, characterized in that The source CU sends first information to the first CU, including: Before initiating LTM switching, the source CU sends the first information to all the candidate CUs; or, When the LTM switch is initiated or the LTM switch is completed, the source CU sends the first information to the target CU.

18. The method according to claim 16 or 17, characterized in that The indication information is used to indicate the LTM candidate cell configuration to be released; The indication information includes an identifier of the LTM candidate cell configuration to be released; or, the indication information instructs the terminal to release the LTM candidate cell configuration that meets a fourth condition, and the fourth condition includes at least one of the following: the candidate cell and the target cell have different first identifiers, and the candidate cell and the target cell are in different first lists; the first identifier or the first list is used to determine whether to perform packet data convergence protocol PDCP reconstruction and key change during switching.

19. The method according to claim 16 or 17, characterized in that The indication information is used to indicate the LTM candidate cell configuration that needs to be retained; The indication information includes an identifier of the LTM candidate cell configuration that needs to be retained; or the indication information instructs the terminal to retain the LTM candidate cell configuration that meets the fifth condition, and the fifth condition includes at least one of the following: the candidate cell and the target cell have the same first identifier, and the candidate cell and the target cell are in the same first list; the first identifier or the first list is used to determine whether to perform PDCP reconstruction and key change during switching.

20. The method according to any one of claims 16 to 19, characterized in that The method further comprises: The source CU sends the at least one LTM candidate cell configuration to the terminal; The LTM candidate cell configuration includes at least one of the following: Layer 1 measurement configuration associated with the LTM candidate cell; The cell configuration applied when the terminal accesses the LTM candidate cell; The transmission configuration indicator TCI state configuration associated with the LTM candidate cell; The random access channel RACH configuration associated with the LTM candidate cell.

21. A method for processing a cell handover, characterized in that: include: The target centralized unit CU sends second information to the target distributed unit DU when confirming that the terminal is switched to the target cell; The second information includes at least one of the following: The second indication information is used to instruct to stop sending the mobility LTM switching command triggered by layer 1 or layer 2 to the terminal; A list of identifiers of candidate target cells.

22. The method according to claim 21, characterized in that The identifier list of the candidate target cells is used to indicate that the target DU is allowed to send an LTM switching command to the terminal, so that the terminal switches to the candidate target cells corresponding to the identifier list; or, The candidate target cell identification list is used to instruct the target DU to stop sending the LTM switching command to the terminal, so that the terminal switches to the candidate target cell corresponding to the identification list.

23. The method according to claim 21 or 22, characterized in that After sending the second information to the target DU, the method further includes: The target CU sends third information to the target DU when completing the reconfiguration of the candidate cell key of the terminal; The third information includes at least one of the following: The third indication information is used to instruct the target DU to resume or restart sending an LTM switching command to the terminal; A second list of candidate target cells.

24. The method according to claim 23, characterized in that The second list is used to indicate that the target DU is allowed to send an LTM switching command to the terminal, so that the terminal is switched to a candidate target cell corresponding to the second list; or, The second list is used to instruct the target DU to resume or restart sending an LTM switching command to the terminal, so that the terminal switches to the candidate target cell corresponding to the second list.

25. The method according to any one of claims 21 to 24, characterized in that The method further comprises: The target CU determines, according to the first information from the source CU, a list of identifiers of the candidate target cells; The first information includes at least one of the following: Configuration identification of each LTM candidate cell; The physical cell identifier PCI and frequency associated with the configuration identifier of each LTM candidate cell; The cell global identifier CGI associated with the configuration identifier of each LTM candidate cell; A first identifier associated with each LTM candidate cell; The identifier of the first list to which each LTM candidate cell belongs.

26. A cell switching processing device, characterized in that: include: Acquisition module and processing module; The acquisition module is used to acquire at least one layer 1 or layer 2 triggered mobility LTM candidate cell configuration; The processing module is configured to release or retain at least part of the LTM candidate cell configurations in the at least one LTM candidate cell configuration according to a first rule when switching to a target cell; The first rule includes any one of the following: Whether the target cell meets the first condition; The indication information sent by the target cell.

27. A cell switching processing device, characterized in that: include: Send module; The sending module is used to send indication information to the terminal when confirming that the terminal is switched to the target cell; The indication information is used to release or retain at least part of the LTM candidate cell configuration in at least one layer 1 or layer 2 triggered mobility LTM candidate cell configuration.

28. A cell switching processing device, characterized in that: include: Send module; The sending module is used to send first information to a first CU, where the first CU is all candidate CUs or target CUs, and the first information is used by the target CU to send indication information to the terminal, where the indication information is used to release or retain at least part of the LTM candidate cell configurations in the mobility LTM candidate cell configuration triggered by at least one layer 1 or layer 2; The first information includes at least one of the following: Configuration identification of each LTM candidate cell; The physical cell identifier PCI and frequency associated with the configuration identifier of each LTM candidate cell; The cell global identifier CGI associated with the configuration identifier of each LTM candidate cell; A first identifier associated with each LTM candidate cell; The identifier of the first list to which each LTM candidate cell belongs.

29. A cell switching processing device, characterized in that: include: Send module; The sending module is used to send second information to the target distribution unit DU when confirming that the terminal is switched to the target cell; The second information includes at least one of the following: The second indication information is used to instruct to stop sending the mobility LTM switching command triggered by layer 1 or layer 2 to the terminal; A list of identifiers of candidate target cells.

30. A terminal, characterized in that: The method comprises 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 for processing cell handover according to any one of claims 1 to 11 are implemented.

31. A network side device, characterized in that: It includes a processor and a memory, 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, it implements the steps of the cell switching processing method as described in any one of claims 12 to 18, or implements the steps of the cell switching processing method as described in any one of claims 19 to 23, or implements the steps of the cell switching processing method as described in any one of claims 24 to 28.

32. 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 cell switching processing method as described in any one of claims 1 to 11, or implements the steps of the cell switching processing method as described in any one of claims 12 to 18, or implements the steps of the cell switching processing method as described in any one of claims 19 to 23, or implements the steps of the cell switching processing method as described in any one of claims 24 to 28.

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