Communication method and apparatus, and storage medium

Abstract

The present disclosure relates to a communication method and apparatus, and a storage medium and a computer program product. The method comprises: receiving a target message sent by a network-side device, wherein the target message includes access assistance information, the access assistance information is used for assisting a terminal in cell access, and the access assistance information at least includes cell identification information; and performing conditional LTM handover processing on the basis of the access assistance information. By using the method, a network side can provide access-related information of a cell to a terminal side in advance, and upon detecting that an execution condition for a conditional LTM handover is met, a terminal can immediately execute the conditional LTM handover on the basis of the information received in advance, thereby simplifying the network access procedure, improving the efficiency of the terminal for executing the conditional LTM handover, shortening a delay of the conditional LTM handover, and guaranteeing the stability and real-time performance of communication between the terminal and a network.

Description

Communication method, device and storage medium Cross-references

[0001] This application refers to Chinese Patent Application No. 2024102622544, filed on March 7, 2024, entitled “Communication Method, Apparatus, Communication Equipment and Storage Medium”, which is incorporated herein by reference in its entirety. Technical Field

[0002] The present disclosure relates to the field of communication technologies, and in particular to a communication method, device, storage medium, and computer program product. Background Art

[0003] L1L2 triggered mobility (LTM) is introduced in NR mobility, that is, the network pre-configures LTM candidate cell configuration information and LTM L1 measurement configuration information for User Equipment (UE). The UE performs L1 measurement of the candidate cell based on the LTM L1 measurement configuration information and reports the LTM L1 measurement result to the network. The network makes a cell change decision based on the L1 measurement result information reported by the UE. If the network decides that cell switching is required, the network will send a cell switching command to the UE through the Medium Access Control Control Element (MAC CE). The cell switching MAC CE (Cell Switch MAC CE) carries the identification information of the target cell. When the UE receives the Cell Switch MAC CE, the UE will perform cell switching to access the target cell.

[0004] In related technologies, conditional LTM switching is triggered by the terminal side itself. When performing conditional LTM switching, the terminal can only first perform a random access process on the target cell to obtain parameters such as timing advance (TA), resulting in a long delay in conditional LTM switching. Summary of the Invention

[0005] Based on this, the present disclosure provides a communication method, apparatus, storage medium, and computer program product.

[0006] In a first aspect, the present disclosure provides a communication method, applied to a terminal, the method comprising:

[0007] receiving a target message sent by a network-side device, where the target message includes access assistance information, where the access assistance information is used to assist the terminal in accessing a cell, and the access assistance information includes at least cell identification information;

[0008] Conditional L1L2 triggered mobility (LTM) handover processing is performed based on the access assistance information.

[0009] In some embodiments, the target message is a target Medium Access Control Control Element (MAC CE) message, the access assistance information further includes type indication information, and the performing conditional LTM switching processing based on the access assistance information includes:

[0010] If it is determined based on the type indication information that the access assistance information is used to provide access assistance information of a candidate cell, locally storing the access assistance information of the candidate cell;

[0011] If the access conditions are met, conditional LTM switching is performed based on the locally stored access assistance information to access the target cell.

[0012] In some embodiments, if the access condition is met, performing conditional LTM handover processing based on locally stored access assistance information to access the target cell includes:

[0013] If there is a target cell that meets the execution conditions of conditional LTM switching, and the access assistance information of the target cell is queried locally, the target cell is accessed based on the cell identification information and communication parameters contained in the access assistance information of the target cell, and the communication parameters include at least one of the uplink access timing advance, beam information, and random access resources.

[0014] In some embodiments, the access assistance information further includes usage conditions; and accessing the target cell based on the cell identification information and communication parameters included in the access assistance information of the target cell includes:

[0015] determining communication parameters that satisfy the usage conditions;

[0016] Accessing the target cell based on the identification information of the target cell and the communication parameters that meet the usage conditions.

[0017] In some embodiments, the usage condition includes a usage condition corresponding to a target communication parameter, and the target communication parameter includes the beam information and / or the random access resource.

[0018] In some embodiments, accessing the target cell based on the cell identification information and communication parameters included in the access assistance information of the target cell includes:

[0019] Determining an uplink access timing advance included in the access assistance information of the target cell;

[0020] Determining target communication parameters that meet usage conditions corresponding to the target communication parameters;

[0021] Accessing the target cell is performed based on the cell identification information of the target cell, the uplink access timing advance, and the target communication parameter that meets the usage condition corresponding to the target communication parameter.

[0022] In some embodiments, the communication parameters include uplink access timing advance, beam information, and random access resources;

[0023] Accessing the target cell based on the cell identification information and communication parameters included in the access assistance information of the target cell includes:

[0024] Determining an uplink access timing advance included in the access assistance information of the target cell;

[0025] Determining beam information that meets the usage condition corresponding to the beam information;

[0026] Determining a random access resource that meets a usage condition corresponding to the random access resource;

[0027] Access the target cell based on the cell identification information of the target cell, the uplink access timing advance, the beam information that meets the usage conditions corresponding to the beam information, and the random access resources that meet the usage conditions corresponding to the random access resources.

[0028] In some embodiments, the usage condition is a usage condition based on a signal threshold or a usage condition based on a time threshold.

[0029] In some embodiments, the target MAC CE message is an extended LTM cell handover command MAC CE message, and each target MAC CE message includes access assistance information of a candidate cell.

[0030] In some embodiments, the target MAC CE message is a newly configured MAC CE message, and the target MAC CE message includes access assistance information of one candidate cell or access assistance information of multiple candidate cells.

[0031] In some embodiments, the target message is an extended LTM cell handover command MAC CE message, the target message includes access assistance information of the target cell, the access assistance information also includes communication parameters and type indication information, and the conditional LTM handover processing based on the access assistance information includes:

[0032] If it is determined that the type indication information is used to instruct the terminal to perform cell handover, the target cell is accessed based on the cell identification information and communication parameters included in the access assistance information of the target cell.

[0033] In some embodiments, the target message is a newly configured MAC CE message, the target message includes access assistance information of the target cell, the access assistance information also includes communication parameters and type indication information, and the conditional LTM switching processing based on the access assistance information includes:

[0034] If it is determined that the type indication information is used to instruct the terminal to perform cell handover, the target cell is accessed based on the cell identification information and communication parameters included in the access assistance information of the target cell.

[0035] In a second aspect, the present disclosure provides a communication method, applied to a network-side device, the method comprising:

[0036] A target message is sent, where the target message includes access assistance information, and the access assistance information includes at least cell identification information.

[0037] In some embodiments, the target message is a target MAC CE message, which is an extended LTM cell handover command MAC CE message, and each target MAC CE message includes access assistance information of a candidate cell.

[0038] In some embodiments, the target MAC CE message is a newly configured MAC CE, and the target MAC CE message includes access assistance information of one candidate cell or access assistance information of multiple candidate cells.

[0039] In a third aspect, the present disclosure provides a communication device, applied to a terminal, the device comprising:

[0040] A first receiving unit is configured to receive a target message sent by a network-side device, where the target message includes access assistance information, where the access assistance information is used to assist the terminal in accessing a cell, and the access assistance information includes at least cell identification information;

[0041] The first processing unit is configured to perform conditional LTM switching processing based on the access assistance information.

[0042] In a fourth aspect, the present disclosure provides a communication device, applied to a network-side device, the device comprising:

[0043] The first sending unit is used to send a target message, wherein the target message includes access assistance information, and the access assistance information is used to assist the terminal in cell access. The access assistance information at least includes cell identification information, so that the terminal performs conditional LTM switching processing based on the access assistance information.

[0044] In a fifth aspect, the present disclosure provides a communication device, including a memory, a transceiver, and a processor:

[0045] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

[0046] Receive a target message sent by a network side device, the target message including access assistance information, the access assistance information is used to assist the terminal in cell access, and the access assistance information at least includes cell identification information; perform conditional LTM switching processing based on the access assistance information.

[0047] In a sixth aspect, the present disclosure provides a communication device, including a memory, a transceiver, and a processor:

[0048] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

[0049] A target message is sent, where the target message includes access assistance information, and the access assistance information includes at least cell identification information.

[0050] In a seventh aspect, the present disclosure provides a communication device, including a memory, a transceiver, and a processor:

[0051] A memory for storing computer programs; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer programs in the memory and executing the steps of the communication method provided in the above embodiment.

[0052] In an eighth aspect, the present disclosure provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the communication method provided in the above embodiment when the computer program is executed by a processor.

[0053] In a ninth aspect, the present disclosure further provides a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of the communication method provided in the above embodiment.

[0054] The above-mentioned communication method, device, storage medium and computer program product, wherein the method includes: receiving a target message sent by a network-side device, the target message including access assistance information, the access assistance information being used to assist the terminal in accessing a cell, the access assistance information including at least cell identification information; and performing conditional LTM switching processing based on the access assistance information. By adopting this method, the network side can provide the terminal side with access-related information of the cell in advance, and the terminal can immediately perform conditional LTM switching based on the information received in advance when detecting that the execution conditions for conditional LTM switching are met, thereby simplifying the network access process, improving the efficiency of the terminal in performing conditional LTM switching and improving the performance of conditional LTM switching, reducing the delay of conditional LTM switching, and ensuring the stability and real-time nature of communication between the terminal and the network.

[0055] The above description is only an overview of the technical solution of the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the embodiments below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present disclosure. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0057] FIG1 is a diagram illustrating an application environment of a communication method according to an embodiment of the present disclosure;

[0058] FIG2 is a flow chart of a communication method according to an embodiment of the present disclosure;

[0059] FIG3 is a flow chart of a communication method according to an embodiment of the present disclosure;

[0060] FIG4 is a flow chart of a communication method according to an embodiment of the present disclosure;

[0061] FIG5 is a flow chart of a communication method according to an embodiment of the present disclosure;

[0062] FIG6 is a flow chart of a communication method according to an embodiment of the present disclosure;

[0063] FIG7 is a flow chart of a communication method according to an embodiment of the present disclosure;

[0064] FIG8 is a schematic diagram of a MAC CE message in R18 in an embodiment of the present disclosure;

[0065] FIG9 is a structural block diagram of a communication device according to an embodiment of the present disclosure;

[0066] FIG10 is a structural block diagram of another communication device according to an embodiment of the present disclosure;

[0067] FIG11 is a structural block diagram of a communication device in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0068] The following embodiments of the technical solution of the present disclosure are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present disclosure and are therefore only examples and are not intended to limit the scope of protection of the present disclosure.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "including" and "having" and any variations thereof in the specification and claims of the present disclosure and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0070] In the description of the embodiments of the present disclosure, technical terms such as "first" and "second" are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0071] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0072] In the description of the embodiments of the present disclosure, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0073] In the description of the embodiments of the present disclosure, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0074] In the description of the embodiments of the present disclosure, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present disclosure.

[0075] In the description of the embodiments of the present disclosure, unless otherwise clearly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; they can refer to mechanical connections, electrical connections, and / or communication connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal connectivity between two elements or an interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0076] The disclosed embodiments provide a communication method and apparatus. Based on a network-side device sending access assistance information in advance to a terminal, the terminal can perform conditional LTM handover. Communication between the terminal and the network-side device can be achieved based on the access assistance information received in advance from the network-side device. The method and apparatus are based on the same patent application concept. Since the method and apparatus solve similar problems, the implementation of the apparatus and method can refer to each other, and any repetitions will not be repeated.

[0077] FIG1 shows a schematic diagram of the architecture of the communication system provided by an embodiment of the present disclosure. As shown in FIG1 , the communication system architecture may include the following logical network elements: a terminal 100 and a network-side device 200. The terminal 100 may be a user equipment (UE). The terminal 100 may access the network-side device 200; optionally, the network-side device 200 may include multiple cells, and correspondingly, the terminal 100 may access the cells included in the network-side device 200. Under the R19 mobility enhancement topic of the 3rd Generation Partnership Project (3GPP), the terminal may support conditional LTM switching. Unlike the R18 LTM, the conditional LTM switching is triggered by the terminal itself, and the network does not send a command to trigger the LTM switching. Through the communication architecture and communication method provided by the embodiments of the present disclosure, the terminal 100 can obtain information related to network access of the target cell in advance, that is, obtain access assistance information related to the target cell in advance. When the terminal 100 evaluates whether the execution conditions of the conditional LTM switching are currently met, it can achieve access to the target cell based on the access assistance information related to the target cell that is obtained in advance and stored locally (such as the uplink timing advance, i.e., TA, etc.), that is, achieve access to the network side device 200.

[0078] Before introducing the specific embodiments of the present disclosure, the professional terms involved in the embodiments are explained first:

[0079] LTM: L1 / L2 Triggered Mobility, layer 1 / layer 2 triggered mobility network;

[0080] LTM handover pre-configures LTM candidate cell configuration information and LTM L1 measurement configuration information for the UE. The UE performs L1 measurement of the candidate cell based on the LTM L1 measurement configuration information and reports the LTM L1 measurement result to the network. The network makes a cell handover decision based on the L1 measurement result information reported by the UE. If the network decides that cell handover is required, the network will send a cell handover command to the UE via a Medium Access Control Control Element (MAC CE). The cell switch MAC CE (Cell Switch MAC CE) carries the identification information of the target cell. When the UE receives the Cell Switch MAC CE, it will perform cell handover and access the target cell.

[0081] Conditional LTM switching: Conditional LTM, the terminal performs conditional LTM switching when it determines that the execution conditions of conditional LTM switching are met;

[0082] TA: uplink access timing advance;

[0083] LTM Cell Switch Command MAC CE message: LTM Cell Switch Command MAC CE;

[0084] MAC CE: Medium Access Control Control Element, medium access control control element.

[0085] It should be understood that the communication system architecture in Figure 1 is merely an example of a possible application environment for the disclosed solution. Those skilled in the art will appreciate that the disclosed embodiments can be applied to the communication system architecture in Figure 1 or similar to Figure 1 . Communication architectures obtained by appropriate modifications and variations based on the communication system architecture in Figure 1 are still applicable to the solutions of the disclosed embodiments.

[0086] The technical solutions provided by the embodiments of the present disclosure can be applicable to a variety of systems. For example, applicable systems may be long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, advanced long term evolution (LTE-A) systems, universal mobile telecommunication systems (UMTS), worldwide interoperability for microwave access (WiMAX) systems, 5G new radio (NR) systems and their evolved communication systems, etc. These various systems may include terminal devices and network devices. The system may also include a core network part, such as an evolved packet system (EPS), a 5G system (5GS), etc.

[0087] The terminal devices involved in the embodiments of the present disclosure may refer to terminal IoT (Internet of Things) devices or CIoT (Cellular Internet of Things) devices; they may also refer to devices that provide voice and / or data connectivity to users, handheld devices with wireless connection capabilities, or other processing devices connected to wireless modems. In different systems, the names of terminal devices may also be different. For example, in a 5G system, a terminal device may be called User Equipment (UE). Wireless terminal devices may be USB storage devices, other personal computer memory devices, and dongles, and may also communicate with one or more core networks (CN) via a radio access network (RAN). Wireless terminal devices may be mobile terminal devices, such as mobile phones (or "cellular" phones) and computers with mobile terminal devices. For example, they may be portable, pocket-sized, handheld, computer-built-in, or vehicle-mounted mobile devices that exchange voice and / or data with a radio access network. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), personal computers, tablet computers, Machine-type Communication (MTC) terminal devices, etc. Wireless terminal devices may also be referred to as systems, subscriber units, subscriber stations, mobile stations, mobile stations, remote stations, access points, remote terminal devices, access terminal devices, user terminal devices, user agents, user devices, and wireless access points and routers / modems that meet the limitations of this definition, but are not limited in the embodiments of the present disclosure.

[0088] The network side device involved in the embodiments of the present disclosure may be a base station, which may include multiple cells providing services to the terminal. Depending on the specific application scenario, the base station may also be called an access point, or may be a device in the access network that communicates with the wireless terminal device through one or more sectors on the air interface, or other names. The network device may be used to interchange received air frames with Internet Protocol (IP) packets, acting as a router between the wireless terminal device and the rest of the access network, wherein the rest of the access network may include an Internet Protocol (IP) communication network. The network device may also coordinate the attribute management of the air interface. For example, the network device involved in the embodiments of the present disclosure may be an evolutionary network device (eNB or e-NodeB) in a long term evolution (LTE) system, a 5G base station (gNB) in a next generation system, etc., or a home evolved Node B (HeNB), a relay node, a femto, a pico base station, a network test device, etc., which is not limited in the embodiments of the present disclosure. In some network structures, network devices may include centralized unit (CU) nodes and distributed unit (DU) nodes, and the centralized unit and the distributed unit may also be arranged geographically separately.

[0089] The terminal device in the embodiment of the present disclosure sends relevant information or similar descriptions to the network side device, which only indicates that the terminal device sends the relevant information in the form of a wireless signal, and its intended recipient is the network side device. The network side device can obtain the relevant information by receiving the wireless signal.

[0090] In an exemplary embodiment, as shown in FIG2 , a communication method is provided. The method is described by taking the application of the method to the terminal shown in FIG1 as an example. The communication method may include:

[0091] Step 202: Receive a target message sent by a network-side device.

[0092] Optionally, the target message includes access assistance information, which is used to assist the terminal in accessing a cell and includes at least cell identification information. The cell identification information can be identification information of a candidate cell or identification information of a target cell. The network-side device can send a target message including the access assistance information to the terminal, and the terminal can perform conditional LTM handover processing based on the target message.

[0093] Step 204: Perform conditional LTM switching based on the access assistance information.

[0094] Optionally, after receiving the target message containing the access assistance information, the terminal may perform conditional LTM switching based on the access assistance information contained in the target message, thereby providing a communication basis for the terminal to access the network in subsequent processes.

[0095] Optionally, the serving cell may send a target message to the terminal device. After receiving the target message sent by the serving cell, the terminal may perform conditional LTM switching processing based on the access assistance information included in the target message.

[0096] In the above-mentioned communication method, a target message sent by a network-side device is received, the target message including access assistance information, which is used to assist a terminal in accessing a cell and includes at least cell identification information; and conditional LTM handover processing is performed based on the access assistance information. By adopting this method, the network-side device can provide the terminal with access-related information about the cell in advance. When the terminal detects that the execution conditions for conditional LTM handover are met, it can execute conditional LTM handover based on the information received in advance, thereby simplifying the network access process, improving the efficiency of the terminal in executing conditional LTM handover, reducing the delay of conditional LTM handover, and ensuring the stability and real-time performance of communication between the terminal and the network-side device.

[0097] In one embodiment, the target message is a target MAC CE message. The target MAC CE message may be a message obtained by extending an LTM cell handover command MAC CE message, or a newly configured MAC CE message that is obtained independently of any communication process. Alternatively, the target MAC CE message may be a newly configured RCC message, etc. The access assistance information in the target MAC CE message further includes type indication information, where the type indication information is used to instruct the terminal to perform a conditional LTM handover processing operation, where the conditional LTM handover processing operation matches the content of the type indication information.

[0098] Optionally, the type indication information may be used to indicate the purpose of the access assistance information, for example, the type indication information may be used to instruct the terminal to perform conditional LTM switching processing; the type indication information may also be used to indicate the terminal that the received access assistance information is used to provide access assistance information for a candidate cell, or access assistance information for a target cell.

[0099] Accordingly, as shown in FIG3 , the step of “performing conditional LTM switching processing based on access assistance information” may include:

[0100] Step 302: If it is determined based on the type indication information that the access assistance information is used to provide the access assistance information of the candidate cell, the access assistance information of the candidate cell is stored locally.

[0101] Optionally, the terminal can determine the purpose of the current access assistance information based on the type indication information in the access assistance information. If the terminal determines, based on the type indication information, that the access assistance information is used to provide access assistance information for a candidate cell, or is used to provide access assistance information for a target cell, the terminal can save the received access assistance information, for example, the terminal can save the access assistance information locally.

[0102] Step 304: If the access condition is met, conditional LTM handover is performed based on the locally stored access assistance information to access the target cell.

[0103] The access condition may be a process in which the terminal makes a judgment based on the execution condition of the conditional LTM handover and the access auxiliary information of each candidate cell stored locally.

[0104] Optionally, the terminal may make a judgment based on the access condition. If it is determined that the access condition is currently met, a conditional LTM handover process is performed based on the locally stored access auxiliary information, and the terminal accesses the target cell.

[0105] In this embodiment, the types of information included in the access assistance information are expanded. For example, the access assistance information may include type indication information for indicating the purpose of the access assistance information. The terminal may determine the purpose of the access assistance information based on the type indication information, process the access assistance information in a timely manner, ensure the validity of the access assistance information, and provide a data basis for subsequent terminal access to the network.

[0106] In one embodiment, the access assistance information further includes communication parameters. Optionally, the terminal can access the network by using the communication parameters, which include one or more of uplink access timing advance (TA), beam information, and random access resources.

[0107] Accordingly, the step of “if the access condition is met, performing conditional LTM handover processing based on the locally stored access assistance information to access the target cell” may include:

[0108] If there is a target cell that meets the execution conditions of the conditional LTM handover and the access assistance information of the target cell is locally queried, the target cell is accessed based on the cell identification information and communication parameters included in the access assistance information of the target cell.

[0109] Optionally, after the terminal locally stores the access assistance information of a candidate cell or the access assistance information of multiple candidate cells, the terminal can evaluate whether the execution conditions of the conditional LTM switching are currently met. After determining that there is a target cell that meets the execution conditions of the conditional LTM switching, the terminal can query whether the access assistance information of the target cell is stored locally based on the access assistance information of a candidate cell stored locally or the access assistance information of multiple candidate cells stored locally; if the terminal locally queries the access assistance information of the target cell, the terminal can access the target cell based on the cell identification information and communication parameters contained in the access assistance information of the target cell.

[0110] In one example, the execution condition of the conditional LTM switching can be a condition used by the terminal to determine whether a cell switching is currently required; the terminal can perform a local query based on the identification information of the target cell to determine whether the target cell exists in the received access assistance information. If the target cell exists in the received access assistance information, the terminal can determine that the access condition is currently met, and the terminal can access the target cell by using the communication parameters contained in the target cell and based on the identification information of the target cell.

[0111] In this embodiment, the network side device can provide the terminal side with access-related information of the cell in advance. After the terminal detects that the execution conditions of the conditional LTM switching are met, it can access the network in a timely manner based on the locally stored access auxiliary information, thereby avoiding interacting with the network side device again to obtain communication parameters after the execution conditions of the conditional LTM switching are triggered, reducing the delay of the conditional LTM switching, simplifying the process of the conditional LTM switching, and improving the efficiency of the conditional LTM switching.

[0112] In one embodiment, the communication parameters include at least one of uplink access timing advance, beam information, and random access resources.

[0113] Optionally, the communication parameters included in the access assistance information may include one or more of an uplink access timing advance, beam information, and random access resources. Those skilled in the art may determine the specific information type carried by the communication parameters in the access assistance information based on actual application scenarios. Optionally, the communication parameters are not limited to the uplink access timing advance, beam information, and random access resources, and may also include other types of communication parameters.

[0114] In this embodiment, the types of communication parameters included in the access assistance information are enriched, providing a variety of feasible communication methods for the terminal to access the network. The terminal can access the network by using the communication methods corresponding to the various communication parameters, thereby ensuring the stability and reliability of communication between the terminal and the network.

[0115] In one embodiment, the access assistance information also includes usage conditions. Optionally, the usage conditions are used to determine the communication parameters used by the terminal in the process of accessing the network-side device. The usage conditions may be usage conditions corresponding to the communication parameters. For example, when the communication parameters include beam information, the usage conditions may be usage conditions corresponding to the beam information; when the communication parameters include random access resources, the usage conditions may be usage conditions corresponding to the random access resources. The usage conditions corresponding to different communication parameters may be different or the same.

[0116] Accordingly, as shown in FIG4 , the step of “accessing the target cell based on the cell identification information and communication parameters included in the access assistance information of the target cell” may include:

[0117] Step 402: Determine communication parameters that meet the usage conditions.

[0118] Optionally, the terminal can evaluate the communication parameters contained in the access assistance information and the usage conditions corresponding to the communication parameters to determine the communication parameters that meet the usage conditions, that is, based on the usage conditions corresponding to this type of communication parameters, the communication parameters are evaluated and screened to determine the communication parameters that meet the usage conditions corresponding to this type of communication parameters.

[0119] Step 404: Access the target cell based on the identification information of the target cell and the communication parameters that meet the usage conditions.

[0120] Optionally, the terminal may access the target cell based on the identification information of the target cell by using communication parameters that meet the usage conditions.

[0121] In this embodiment, the types of information contained in the access auxiliary information are further enriched, providing an evaluation basis for the terminal to screen the communication parameters. The terminal can screen the communication parameters used when accessing the network, further improving the stability of the terminal's network access, and also improving the communication efficiency between the terminal and the network.

[0122] In one embodiment, the usage conditions include usage conditions corresponding to target communication parameters. The target communication parameters may be communication parameters for which usage conditions exist, such as target communication parameters including beam information and / or random access resources. In other words, the communication parameters in the access assistance information may include beam information, random access resources, or both. Optionally, the access assistance information may also include usage conditions.

[0123] In one example, when the communication parameters in the access assistance information include beam conditions, the usage conditions may include usage conditions corresponding to the beam conditions; when the communication parameters in the access assistance information include random access resources, the usage conditions may include usage conditions corresponding to the random access resources.

[0124] Optionally, the target communication parameter may be a communication parameter with a usage condition, such as beam information, and the usage condition may be the usage condition corresponding to the beam information. The target communication parameter may also be a random access resource, and the corresponding usage condition may be the usage condition corresponding to the random access resource. The target communication parameter may also include beam information and random access resources, and the corresponding usage condition may include the usage condition corresponding to the beam information and the usage condition corresponding to the random access resource. Optionally, the target communication parameter may also include other types of communication parameters, and the embodiments of this disclosure do not limit the types of target communication parameters.

[0125] Optionally, if the terminal determines that a target cell exists that meets the execution conditions for conditional LTM handover and locally queries access assistance information for the target cell, the terminal may evaluate the target communication parameters in the access assistance information based on the usage conditions to obtain target communication parameters that meet the usage conditions. Based on this, the terminal may access the target cell using the target communication parameters that meet the usage conditions.

[0126] In one embodiment, the communication parameters may include beam information. If the terminal determines that there is a target cell that meets the execution conditions of the conditional LTM switching, and the access assistance information of the target cell is queried locally at the terminal, the terminal can perform the processing operation of the conditional LTM switching. The specific processing process may include the terminal evaluating the beam information and the usage conditions corresponding to the beam information. If the beam information that meets the usage conditions corresponding to the beam information is determined, the terminal can access the target cell by using the beam information that meets the usage conditions. Similarly, the communication parameters may also include random access resources, or may include both beam information and random access resources. The corresponding specific processing process is similar to the specific processing process that only includes beam information, and this embodiment will not be repeated here.

[0127] In this embodiment, the specific content of the usage conditions is clarified. The terminal can evaluate the communication parameters according to the usage conditions and access the target cell by using the communication parameters that meet the usage conditions, thereby further improving the stability of the terminal's network access.

[0128] In one embodiment, as shown in FIG5 , the step of “accessing the target cell based on the cell identification information and communication parameters included in the access assistance information of the target cell” may include:

[0129] Step 502: Determine the uplink access timing advance included in the access assistance information of the target cell.

[0130] Optionally, the terminal may parse the access assistance information and extract the uplink access timing advance carried in the access assistance information.

[0131] Step 504: Determine target communication parameters that meet usage conditions corresponding to the target communication parameters.

[0132] The target communication parameter may be a communication parameter for which a corresponding usage condition exists.

[0133] Optionally, if the terminal obtains the usage condition corresponding to the target communication parameter in the access assistance information, the terminal may evaluate the target communication parameter based on the usage condition corresponding to the target communication parameter and determine the target communication parameter that meets the usage condition.

[0134] Step 506: Access the target cell based on the cell identification information of the target cell, the uplink access timing advance, and the target communication parameters that meet the usage conditions corresponding to the target communication parameters.

[0135] Optionally, the terminal may access the target cell based on the identification information of the target cell, the uplink access timing advance included in the terminal auxiliary information, and the determined target communication parameter that meets the usage condition corresponding to the target communication parameter.

[0136] It should be noted that the present disclosure does not limit the order of execution of the above steps 502, 504, and 506. The terminal can execute the above steps 502, 504, and 506 simultaneously, or can execute 502, 504, and 506 in sequence. Those skilled in the art can make specific determinations based on actual application scenarios.

[0137] In this embodiment, when there are multiple types of communication parameters included in the access assistance information, the terminal directly determines the communication parameters, and can determine the target communication parameters that meet the usage conditions, and achieves access to the network by using the above communication parameters to ensure communication stability.

[0138] In one embodiment, the communication parameters may include uplink access timing advance, beam information, and random access resources. The target communication parameters include beam information and random access resources.

[0139] Accordingly, as shown in FIG6 , the step of “accessing the target cell based on the cell identification information and communication parameters included in the access assistance information of the target cell” may include:

[0140] Step 602: Determine the uplink access timing advance included in the access assistance information of the target cell.

[0141] Optionally, the terminal may parse the access assistance information and extract the uplink access timing advance carried in the access assistance information.

[0142] Step 604: Determine beam information that meets the usage conditions corresponding to the beam information.

[0143] Among them, the usage condition corresponding to the beam information can be a usage condition based on a signal threshold value or a usage condition based on a time threshold value.

[0144] Optionally, the terminal may evaluate the beam information based on the usage conditions corresponding to the beam information, and determine the beam information that meets the usage conditions corresponding to the beam information.

[0145] In one example, the terminal may determine beam information that satisfies a usage condition based on a signal threshold, or may also determine beam information that satisfies a usage condition based on a time threshold.

[0146] Step 606: Determine a random access resource that meets the usage condition corresponding to the random access resource.

[0147] The terminal may evaluate the random access resource based on the usage condition corresponding to the random access resource, and determine a random access resource that meets the usage condition corresponding to the random access resource.

[0148] In an example, the terminal may determine a random access resource that meets a usage condition based on a signal threshold, or may also determine a random access resource that meets a usage condition based on a time threshold.

[0149] Step 608: Access the target cell based on the cell identification information of the target cell, the uplink access timing advance, the beam information that meets the usage conditions corresponding to the beam information, and the random access resources that meet the usage conditions corresponding to the random access resources.

[0150] Optionally, the terminal can access the target cell based on the identification information of the target cell, the uplink access timing advance included in the terminal auxiliary information, the determined beam information that meets the usage conditions, and the determined random access resources that meet the usage conditions.

[0151] It should be noted that the present disclosure does not limit the order of execution of the above steps 602, 604, and 606. The terminal can execute the above steps 602, 604, and 606 simultaneously, or can execute 602, 604, and 606 in sequence. Those skilled in the art can determine the order of execution of the above steps based on the actual application scenario.

[0152] In this embodiment, when there are multiple types of communication parameters included in the access assistance information, the terminal directly determines the communication parameters, and can determine the target communication parameters that meet the usage conditions, and achieves access to the network by using the above communication parameters to ensure communication stability.

[0153] In one embodiment, the usage condition is a usage condition based on a signal threshold or a usage condition based on a time threshold.

[0154] Optionally, in the case where the usage condition is a usage condition based on a signal threshold value, the specific process of the terminal determining the communication parameters that meet the usage condition based on the signal threshold value can be: the terminal determines the signal threshold value included in the usage condition through the usage condition based on the signal threshold value, the terminal can determine the communication parameter whose signal strength is greater than the signal threshold value, and determine it as the communication parameter that meets the usage condition based on the signal threshold value based on the communication parameter greater than the signal threshold value; based on this, the terminal can perform conditional LTM switching processing based on the communication parameter greater than the signal threshold value to access the target cell.

[0155] Optionally, the communication parameter may be beam information. When the usage condition is based on a signal threshold value, the terminal may determine beam information whose signal strength is greater than the signal threshold value, and access the target cell based on the beam information whose signal strength is greater than the signal threshold value.

[0156] In another embodiment, the usage condition may be a usage condition based on a time threshold, and the specific process of the terminal determining the communication parameter that meets the usage condition based on the time threshold may be: the terminal determines the signal threshold value and the time threshold included in the usage condition through the usage condition based on the time threshold, the terminal may determine the communication parameter whose signal strength is greater than the signal threshold value, and after determining that the maintenance time of the communication parameter whose signal strength is greater than the signal threshold value is greater than the time threshold, determine that the communication parameter is determined to be the communication parameter that meets the usage condition based on the time threshold; based on this, the terminal can access the target cell by using the communication parameter to perform conditional LTM switching processing.

[0157] In this embodiment, the terminal can determine the communication parameters used by the terminal to access the network through the use condition based on the signal threshold value or the use condition based on the time threshold value, thereby providing a data basis for stable communication between the terminal and the network.

[0158] In one embodiment, the target MAC CE message is an extended LTM cell handover command MAC CE message, and each target MAC CE message includes access assistance information of a candidate cell.

[0159] Among them, the LTM cell switching command MAC CE message can be a cell change command sent by the network side device to the terminal. The network side device can extend the MAC CE message originally used to instruct the terminal to perform LTM cell switching, write the access assistance information of a single candidate cell into the LTM cell switching command MAC CE message, obtain the extended LTM cell switching command MAC CE message, and send the extended LTM cell switching command MAC CE message as the target MAC CE message to the terminal.

[0160] In one example, in an extended LTM cell handover command MAC CE message sent by a network device to a terminal, each extended LTM cell handover command MAC CE message carries only access assistance information for a single candidate cell. The network device may send multiple extended LTM cell handover command MAC CE messages to the terminal, and the terminal may obtain access assistance information for multiple candidate cells.

[0161] In this embodiment, the network side device can expand the LTM cell switching command MAC CE message and write the access assistance information of the candidate cell into the LTM cell switching command MAC CE message. Relying on the LTM cell switching command, the network side device sends the access assistance information related to network access of each cell to the terminal in advance. After detecting that the conditional LTM switching is met, the terminal can access the network in time based on the access assistance information of the locally stored cell, thereby reducing the delay of the terminal accessing the network and ensuring the timeliness of communication.

[0162] In one embodiment, the target MAC CE message is a newly configured MAC CE message, and the target MAC CE message includes access assistance information of one candidate cell or access assistance information of multiple candidate cells.

[0163] Among them, the newly configured MAC CE message can be a communication message reconfigured by the network side device and is not dependent on any communication process. The target MAC CE message can also be a newly configured RRC message, etc.; the network side device can perform a message configuration operation, write the access assistance information of a single candidate cell or the access assistance information of multiple candidate cells into the newly configured MAC CE message, obtain the target MAC CE message, and send the target MAC CE message to the terminal.

[0164] In an example, in the newly configured MAC CE message sent by the network side device to the terminal, each newly configured MAC CE message may carry access assistance information of a single candidate cell, or may carry access assistance information of multiple candidate cells.

[0165] In this embodiment, the network side device can newly configure a MAC CE message and write the access assistance information of the candidate cell into the newly configured MAC CE message, so that the network side device can simultaneously send access assistance information related to network access of multiple cells to the terminal in advance, thereby improving the efficiency of sending access assistance information of the network and further improving performance.

[0166] In one embodiment, the target message is an extended LTM cell handover command MAC CE message, the target message includes access assistance information of the target cell, the access assistance information also includes communication parameters and type indication information, and conditional LTM handover processing is performed based on the access assistance information, including:

[0167] If it is determined that the type indication information is used to instruct the terminal to perform cell handover, the target cell is accessed based on the cell identification information and communication parameters included in the access assistance information of the target cell.

[0168] Optionally, the terminal can receive an extended LTM cell switching command MAC CE message sent by the network side device, and parse the extended LTM cell switching command MAC CE message to obtain access assistance information, so that the terminal can determine the purpose of the current access assistance information based on the type indication information in the access assistance information. If the terminal determines, based on the type indication information, that the access assistance information is used to instruct the terminal to perform conditional LTM, the terminal can access the target cell based on the cell identification information and communication parameters in the access assistance information.

[0169] In this embodiment, the content of the type indication information in the access assistance information is enriched, and the access assistance information can directly carry the type indication information indicating cell switching. The terminal can receive the access assistance information and access the network, further simplifying the process of terminal network access and reducing the delay of terminal network access.

[0170] In one embodiment, the target message is a newly configured MAC CE message, and the target message includes access assistance information of the target cell. The access assistance information also includes communication parameters and type indication information. Conditional LTM handover processing is performed based on the access assistance information, including:

[0171] If it is determined that the type indication information is used to instruct the terminal to perform cell handover, the target cell is accessed based on the cell identification information and communication parameters included in the access assistance information of the target cell.

[0172] Optionally, the terminal can receive a newly configured MAC CE message sent by the network side device, and parse the newly configured MAC CE message to obtain access assistance information, so that the terminal can determine the purpose of the current access assistance information based on the type indication information in the access assistance information. If the terminal determines, based on the type indication information, that the access assistance information is used to instruct the terminal to perform conditional LTM, the terminal can access the target cell based on the cell identification information and communication parameters in the access assistance information.

[0173] In this embodiment, the content of the type indication information is further expanded, and the access assistance information can directly carry the type indication information indicating cell switching. The terminal can receive the access assistance information and access the network, further simplifying the process of terminal network access and reducing the delay of terminal network access.

[0174] In an exemplary embodiment, as shown in FIG7 , a communication method is provided. The method is described by taking the application of the method to the network side device shown in FIG1 as an example. The communication method may include:

[0175] Step 702: Send the target message.

[0176] The target message includes access assistance information, which is used to assist the terminal in accessing a cell. The access assistance information includes at least cell identification information, and the terminal performs conditional LTM switching based on the access assistance information.

[0177] Optionally, the network side device can generate a target message containing access assistance information and send the target message to the terminal. After receiving the target message containing access assistance information, the terminal can perform conditional LTM switching processing based on the access assistance information contained in the access assistance information, thereby providing a communication basis for the terminal to access the network side device in subsequent processes.

[0178] In this embodiment, the network side can provide the terminal side with access-related information of the cell in advance. When the terminal detects that the execution conditions for conditional LTM switching are met, the terminal can immediately execute conditional LTM switching based on the information received in advance, thereby simplifying the network access process, improving the efficiency of the terminal in executing conditional LTM switching, reducing the delay of conditional LTM switching, and ensuring the stability and real-time performance of communication between the terminal and the network side equipment.

[0179] In one embodiment, the target message is a target MAC CE message, which is an extended LTM cell handover command MAC CE message. Each target MAC CE message includes access assistance information of a candidate cell.

[0180] Among them, the LTM cell switching command MAC CE message can be a cell change command sent by the network side device to the terminal. The network side device can expand the MAC CE message originally used to instruct the terminal to perform LTM cell switching, write the access assistance information of a single candidate cell into the LTM cell switching command MAC CE message, obtain the extended LTM cell switching command MAC CE message, and use the extended LTM cell switching command MAC CE message as the target MAC CE message, and send the target MAC CE message to the terminal.

[0181] In one example, in an extended LTM cell handover command MAC CE message sent by a network device to a terminal, each extended LTM cell handover command MAC CE message carries only access assistance information for a single candidate cell. The network device may send multiple extended LTM cell handover command MAC CE messages to the terminal, and the terminal may obtain access assistance information for multiple candidate cells.

[0182] In this embodiment, the network side device can expand the LTM cell switching command MAC CE message and write the access assistance information of the candidate cell into the LTM cell switching command MAC CE message. Relying on the LTM cell switching command, the network side sends the access assistance information related to network access of each cell to the terminal in advance. After detecting that the conditional LTM switching is met, the terminal can access the network in time based on the access assistance information of the locally stored cell, thereby reducing the delay of the terminal accessing the network and ensuring the timeliness of communication.

[0183] In one embodiment, the target MAC CE message is a newly configured MAC CE, and the target MAC CE message includes access assistance information of one candidate cell or access assistance information of multiple candidate cells.

[0184] Among them, the newly configured MAC CE message can be a communication message reconfigured by the network side device and is not dependent on any communication process. The target MAC CE message can also be a newly configured RRC message, etc.; the network side device can perform a message configuration operation, write the access assistance information of a single candidate cell or the access assistance information of multiple candidate cells into the newly configured MAC CE message, obtain the target MAC CE message, and send the target MAC CE message to the terminal.

[0185] In an example, in the newly configured MAC CE message sent by the network side device to the terminal, each newly configured MAC CE message may carry access assistance information of a single candidate cell, or may carry access assistance information of multiple candidate cells.

[0186] In this embodiment, the network side device can newly configure a MAC CE message and write the access assistance information of the candidate cell into the newly configured MAC CE message, so that the network side can send access assistance information related to network access of multiple cells to the terminal in advance at the same time, thereby improving the efficiency of sending access assistance information of the network and further improving performance.

[0187] The specific implementation process of the communication method in the above embodiment is described in detail below with reference to specific embodiments:

[0188] In R18 LTM, when LTM switching is triggered, the network (network-side device) will send a switching command MAC CE to the UE, and carry information related to the target cell and access (such as uplink timing advance, TA, etc.) in the MAC CE. In the case of 3GPP's R19 mobility enhancement, the terminal can support conditional LTM switching (conditional LTM). The conditional LTM switching is triggered by the terminal side (UE) itself, and the network side will not send a command to trigger the LTM switching. In the communication method provided in the embodiment of the present disclosure, the UE can obtain information related to the target cell and access (such as uplink timing advance, TA, etc.) in advance, that is, the network can provide the UE with access assistance information of the candidate cell before the conditional LTM switching. Based on this, the terminal can use the access assistance information received in advance to access the target cell after the conditional LTM switching is triggered, thereby reducing the delay of the terminal accessing the network.

[0189] L1 / L2 triggered mobility (LTM) is introduced in NR mobility, that is, the network pre-configures LTM candidate cell configuration information and LTM L1 measurement configuration information for the UE. The UE performs L1 measurement of the candidate cell based on the LTM L1 measurement configuration information and reports the LTM L1 measurement result to the network. The network makes a cell change decision based on the L1 measurement result information reported by the UE. If the network decides that a cell change is required, the network will send a cell change command to the UE through MAC CE, which carries the identification information of the target cell. When the UE receives the cell change MAC CE, the UE will execute the cell change and access the target candidate cell.

[0190] As shown in Figure 8, according to the 38.321 protocol, the LTM cell handover MAC CE may include the following information: target configuration identifier (Target Config ID), uplink access timing advance TA (Timing Advance Command), target cell beam information (SS / PBCH index) and dedicated random access resources (Random Access Preamble index) of the target cell.

[0191] Optionally, in R19, the terminal may support conditional LTM switching, and the UE may evaluate the execution conditions of the conditional LTM and automatically switch to the target cell when the execution conditions are met.

[0192] The communication method provided by the embodiment of the present disclosure can receive access assistance information of one or candidate cells sent by the network in advance when the terminal side triggers conditional LTM switching by itself, thereby reducing the delay of conditional LTM switching of the terminal.

[0193] In one embodiment, the network sends an extended LTM cell switch command MAC CE (ie, LTM Cell Switch Command MAC CE) message to the UE, which carries candidate cell access assistance information.

[0194] Step 1: The serving cell sends an extended LTM cell switch command MAC CE (i.e., LTM Cell Switch Command MAC CE) message to the UE, which carries candidate cell access assistance information. If access assistance information of multiple candidate cells needs to be provided, the network sends multiple MAC CEs to the UE. The access assistance information may include the following information: cell identification information of the candidate cell, uplink access timing advance (TA), beam information, random access resources, and access assistance information type indication information; optionally, the type indication information may be used to indicate to the terminal that the access assistance information is a type indication information providing access assistance information of the candidate cell or the target cell.

[0195] Step 2: The UE receives a MAC CE message carrying the candidate cell access assistance information, and according to the usage indication of the access assistance information, the UE may store the access assistance information locally.

[0196] Step 3: The UE evaluates the execution conditions of the conditional LTM handover.

[0197] Step 4: If the UE determines that there is a candidate cell that meets the execution condition of the conditional LTM handover, the UE confirms the candidate cell that meets the execution condition of the conditional LTM handover as the target cell.

[0198] Step 5: If the UE determines that the target cell is one of the candidate cells for which the access assistance information is received in step 2, the UE accesses the target cell using the locally stored access assistance information of the target cell.

[0199] In another embodiment, the network sends an extended LTM cell switch command MAC CE (ie, LTM Cell Switch Command MAC CE) message to the UE, which carries candidate cell access assistance information.

[0200] Step 1: The serving cell sends an extended LTM cell switch command MAC CE (i.e., LTM Cell Switch Command MAC CE) message to the UE, which carries candidate cell access assistance information. If access assistance information for multiple candidate cells is required, the network sends multiple MAC CEs to the UE. The access assistance information may include the following information: cell identification information of the candidate cell, uplink access timing advance (TA), beam information, random access resources, and access assistance information type indication information; optionally, the type indication information may be type indication information used to instruct the terminal to perform cell switching. Alternatively, the type indication information may be type indication information used by the terminal to perform conditional LTM switching.

[0201] Step 2: The UE receives the target cell access assistance information and performs conditional LTM switching according to the purpose of the access assistance information to access the target cell.

[0202] In another embodiment, the network sends an extended LTM cell switch command MAC CE (ie, LTM Cell Switch Command MAC CE) message to the UE, which carries candidate cell access assistance information and corresponding usage conditions.

[0203] Step 1: The serving cell sends an extended LTM Cell Switch Command MAC CE message (i.e., LTM Cell Switch Command MAC CE) to the UE. This message carries candidate cell access assistance information. If access assistance information for multiple candidate cells needs to be provided, the network sends multiple MAC CEs to the UE. The access assistance information may include the following information: cell identification information of the candidate cell, uplink access timing advance (TA), beam information, random access resources, and access assistance information type indication information. The access assistance information may also include usage conditions corresponding to the beam information and usage conditions corresponding to the random access resources. For example, the type indication information may be used to provide access assistance information for the candidate cell or the target cell.

[0204] Step 2: The UE receives a MAC CE message carrying the candidate cell access assistance information, and according to the usage indication of the access assistance information, the UE may store the access assistance information locally.

[0205] Step 3: The UE evaluates the execution conditions of the conditional LTM handover.

[0206] Step 4: If the UE determines that there is a cell that meets the execution conditions of the conditional LTM handover, the candidate cell that meets the execution conditions of the conditional LTM handover is confirmed as the target cell.

[0207] Step 5: If the UE determines that the target cell is one of the candidate cells for which the access assistance information is received in step 2, the UE confirms the uplink access timing advance TA in the access assistance information of the cell.

[0208] In step 6, the UE evaluates the beam information and the corresponding usage conditions and determines the beam that meets the usage conditions.

[0209] Step 7: The UE evaluates the random access resources and the corresponding usage conditions, and confirms the random access resources that meet the usage conditions.

[0210] Step 8: The UE uses the uplink access timing advance TA, beam, and random access resources confirmed in the above steps to access the target cell.

[0211] In one embodiment, the network sends a MAC CE message to the UE, which carries candidate cell access assistance information and corresponding usage conditions; the MAC CE message can be a newly configured MAC CE message that does not depend on any communication process. The MAC CE message can include access assistance information of one candidate cell or multiple candidate cells.

[0212] Step 1: The serving cell sends a MAC CE message to the UE, which carries access assistance information of one or more candidate cells. The access assistance information includes: cell identification information of the candidate cell, uplink access timing advance TA, beam information, random access resources, and usage conditions corresponding to the beam information and usage conditions corresponding to the random access resources.

[0213] Step 2: The UE receives a MAC CE message carrying the candidate cell access assistance information and stores the access assistance information locally.

[0214] Step 3: The UE evaluates the execution conditions of the conditional LTM handover.

[0215] Step 4: If the UE determines that there is a cell that meets the execution conditions of the conditional LTM handover, the candidate cell that meets the execution conditions of the conditional LTM handover is confirmed as the target cell.

[0216] Step 5: If the UE determines that the target cell is one of the candidate cells for which the access assistance information is received in step 2, the UE confirms the uplink access timing advance TA in the access assistance information of the cell.

[0217] In step 6, the UE evaluates the beam information and the corresponding usage conditions and determines the beam that meets the usage conditions.

[0218] Step 7: The UE evaluates the random access resources and the corresponding usage conditions, and confirms the random access resources that meet the usage conditions.

[0219] Step 8: The UE uses the uplink access timing advance TA, beam, and random access resources confirmed in the above steps to access the target cell.

[0220] The communication method provided by the embodiment of the present disclosure proposes that the network provides the UE with access assistance information of the candidate cell before the conditional LTM handover. After the conditional LTM handover is triggered, the UE uses the received access assistance information to access the target cell. This solves the problem that under the existing mechanism, before the conditional LTM handover, the UE cannot obtain the access-related information of the target cell (such as the uplink timing advance, i.e., TA, etc.), resulting in the UE having to perform the access-at-anytime process on the target cell when performing the conditional LTM handover. The communication method provided by the embodiment of the present disclosure can reduce the delay of the conditional LTM handover and further improve the handover efficiency.

[0221] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0222] Based on the same inventive concept, the embodiments of the present disclosure further provide a communication device for implementing the aforementioned communication method. The implementation solution provided by this device is similar to the implementation solution described in the aforementioned method. Therefore, the specific limitations in one or more communication device embodiments provided below can be found in the above-mentioned limitations on the communication method and will not be further elaborated here.

[0223] In one embodiment, as shown in FIG9 , a communication device 900 is provided, which is applied to a terminal and includes:

[0224] The first receiving unit 902 is configured to receive a target message sent by a network-side device, where the target message includes access assistance information. The access assistance information is used to assist a terminal in accessing a cell, and the access assistance information includes at least cell identification information.

[0225] The first processing unit 904 is configured to perform conditional LTM switching based on the access assistance information.

[0226] In some embodiments, the target message is a target MAC CE message, the access assistance information further includes type indication information, and the first processing unit is specifically configured to:

[0227] If it is determined based on the type indication information that the access assistance information is used to provide access assistance information of a candidate cell, locally storing the access assistance information of the candidate cell;

[0228] If the access conditions are met, conditional LTM switching is performed based on the locally stored access assistance information to access the target cell.

[0229] In some embodiments, the first processing unit is specifically configured to:

[0230] If there is a target cell that meets the execution conditions of conditional LTM switching, and the access assistance information of the target cell is queried locally, the target cell is accessed based on the cell identification information and communication parameters contained in the access assistance information of the target cell, and the communication parameters include at least one of the uplink access timing advance, beam information, and random access resources.

[0231] In some embodiments, the access assistance information further includes usage conditions; and the first processing unit is further configured to:

[0232] determining communication parameters that satisfy the usage conditions;

[0233] Accessing the target cell based on the identification information of the target cell and the communication parameters that meet the usage conditions.

[0234] In some embodiments, the usage condition includes a usage condition corresponding to a target communication parameter, and the target communication parameter includes the beam information and / or the random access resource.

[0235] In some embodiments, the first processing unit is further configured to:

[0236] Determining an uplink access timing advance included in the access assistance information of the target cell;

[0237] Determining target communication parameters that meet usage conditions corresponding to the target communication parameters;

[0238] Accessing the target cell is performed based on the cell identification information of the target cell, the uplink access timing advance, and the target communication parameter that meets the usage condition corresponding to the target communication parameter.

[0239] In some embodiments, the communication parameters include an uplink access timing advance, beam information, and a random access resource, the target communication parameters include the beam information and the random access resource, and the first processing unit is specifically configured to:

[0240] Determining an uplink access timing advance included in the access assistance information of the target cell;

[0241] Determining beam information that meets the usage condition corresponding to the beam information;

[0242] Determining a random access resource that meets a usage condition corresponding to the random access resource;

[0243] Access the target cell based on the cell identification information of the target cell, the uplink access timing advance, the beam information that meets the usage conditions corresponding to the beam information, and the random access resources that meet the usage conditions corresponding to the random access resources.

[0244] In some embodiments, the usage condition is a usage condition based on a signal threshold or a usage condition based on a time threshold.

[0245] In some embodiments, the target MAC CE message is an extended LTM cell handover command MAC CE message, and each target MAC CE message includes access assistance information of a candidate cell.

[0246] In some embodiments, the target MAC CE message is a newly configured MAC CE message, and the target MAC CE message includes access assistance information of one candidate cell or access assistance information of multiple candidate cells.

[0247] In some embodiments, the target message is an extended LTM cell handover command MAC CE message, the target message includes access assistance information of the target cell, and the first processing unit is specifically configured to:

[0248] If it is determined that the type indication information is used to instruct the terminal to perform cell handover, the target cell is accessed based on the cell identification information and communication parameters included in the access assistance information of the target cell.

[0249] In some embodiments, the target message is a newly configured MAC CE message, the target message includes access assistance information of the target cell, and the first processing unit is specifically configured to:

[0250] If it is determined that the type indication information is used to instruct the terminal to perform cell handover, the target cell is accessed based on the cell identification information and communication parameters included in the access assistance information of the target cell.

[0251] In one embodiment, as shown in FIG10 , a communication device 1000 is provided, which is applied to a network-side device and includes:

[0252] The first sending unit 1002 is used to send a target message, which includes access assistance information. The access assistance information is used to assist the terminal in accessing a cell. The access assistance information at least includes cell identification information. The terminal performs conditional LTM switching based on the access assistance information.

[0253] In some embodiments, the target message is a target MAC CE message, which is an extended LTM cell handover command MAC CE message, and each target MAC CE message includes access assistance information of a candidate cell.

[0254] In some embodiments, the target MAC CE message is a newly configured MAC CE, and the target MAC CE message includes access assistance information of one candidate cell or access assistance information of multiple candidate cells.

[0255] It should be noted that the division of units in the embodiments of the present disclosure is schematic and is merely a logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of the present disclosure may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0256] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of the present disclosure, or the part that contributes to the relevant technology, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of the method of each embodiment of the present disclosure.

[0257] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be described in detail here.

[0258] In an exemplary embodiment, a communication device is provided, which may be a terminal device or a network device, and its internal structure may be as shown in Figure 11. The communication device includes a memory, a transceiver, and a processor.

[0259] A transceiver is used to receive and send data under the control of the processor.

[0260] In FIG11 , the bus architecture may include any number of interconnected buses and bridges, specifically various circuits linked together by one or more processors represented by a processor and a memory represented by a memory. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver may be a plurality of components, i.e., a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium, such as a wireless channel, a wired channel, an optical cable, or the like. The processor is responsible for managing the bus architecture and general processing, and the memory may store data used by the processor when performing operations.

[0261] The processor can be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or a complex programmable logic device (CPLD), and the processor can also adopt a multi-core architecture.

[0262] The processor calls the program stored in the memory to execute any of the methods provided by the embodiments of the present disclosure according to the obtained executable instructions. The processor and the memory can also be physically separated.

[0263] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be described in detail here.

[0264] The physical device corresponding to the terminal device or network device is shown in Figure 11, which can implement all the method steps implemented by the method embodiment on the terminal device or network device side, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as the method embodiment will not be described in detail here.

[0265] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be described in detail here.

[0266] In an exemplary embodiment, a communication device is provided, which may be a terminal device, including a memory, a transceiver, and a processor: the memory is configured to store a computer program; the transceiver is configured to transmit and receive data under the control of the processor; and the processor is configured to read the computer program in the memory and perform the following operations:

[0267] Receive a target message sent by a network side device, the target message including access assistance information, the access assistance information is used to assist the terminal in cell access, and the access assistance information at least includes cell identification information; perform conditional LTM switching processing based on the access assistance information.

[0268] In some embodiments, the target message is a target MAC CE message, the access assistance information further includes type indication information, and the processor is configured to specifically perform the following operations:

[0269] If it is determined based on the type indication information that the access assistance information is used to provide access assistance information of a candidate cell, locally storing the access assistance information of the candidate cell;

[0270] If the access conditions are met, conditional LTM switching is performed based on the locally stored access assistance information to access the target cell.

[0271] In some embodiments, the processor is further configured to perform the following operations:

[0272] If there is a target cell that meets the execution conditions of conditional LTM switching, and the access assistance information of the target cell is queried locally, the target cell is accessed based on the cell identification information and communication parameters contained in the access assistance information of the target cell, and the communication parameters include at least one of the uplink access timing advance, beam information, and random access resources.

[0273] In some embodiments, the access assistance information further includes usage conditions, and the processor is configured to specifically perform the following operations:

[0274] determining communication parameters that satisfy the usage conditions;

[0275] Accessing the target cell based on the identification information of the target cell and the communication parameters that meet the usage conditions.

[0276] In some embodiments, the usage condition includes a usage condition corresponding to a target communication parameter, and the target communication parameter includes the beam information and / or the random access resource.

[0277] In some embodiments, the processor is further configured to perform the following operations:

[0278] Determining an uplink access timing advance included in the access assistance information of the target cell;

[0279] Determining target communication parameters that meet usage conditions corresponding to the target communication parameters;

[0280] Accessing the target cell is performed based on the cell identification information of the target cell, the uplink access timing advance, and the target communication parameter that meets the usage condition corresponding to the target communication parameter.

[0281] In some embodiments, the communication parameters include an uplink access timing advance, beam information, and a random access resource, the target communication parameters include the beam information and the random access resource, and the processor is configured to further specifically perform the following operations:

[0282] Determining an uplink access timing advance included in the access assistance information of the target cell;

[0283] Determining beam information that meets the usage condition corresponding to the beam information;

[0284] Determining a random access resource that meets a usage condition corresponding to the random access resource;

[0285] Access the target cell based on the cell identification information of the target cell, the uplink access timing advance, the beam information that meets the usage conditions corresponding to the beam information, and the random access resources that meet the usage conditions corresponding to the random access resources.

[0286] In some embodiments, the usage condition is a usage condition based on a signal threshold or a usage condition based on a time threshold.

[0287] In some embodiments, the target MAC CE message is an extended LTM cell handover command MAC CE message, and each target MAC CE message includes access assistance information of a candidate cell.

[0288] In some embodiments, the target MAC CE message is a newly configured MAC CE message, and the target MAC CE message includes access assistance information of one candidate cell or access assistance information of multiple candidate cells.

[0289] In some embodiments, the target message is an extended LTM cell handover command MAC CE message, the target message includes access assistance information of the target cell, and the processor is configured to specifically perform the following operations:

[0290] If it is determined that the type indication information is used to instruct the terminal to perform cell handover, the target cell is accessed based on the cell identification information and communication parameters included in the access assistance information of the target cell.

[0291] In some embodiments, the target message is a newly configured MAC CE message, the target message includes access assistance information of the target cell, and the processor is configured to specifically perform the following operations:

[0292] If it is determined that the type indication information is used to instruct the terminal to perform cell handover, the target cell is accessed based on the cell identification information and communication parameters included in the access assistance information of the target cell.

[0293] In an exemplary embodiment, a communication device is provided, which may be a network device, including a memory, a transceiver, and a processor: the memory is configured to store a computer program; the transceiver is configured to transmit and receive data under the control of the processor; and the processor is configured to read the computer program in the memory and perform the following operations:

[0294] A target message is sent, where the target message includes access assistance information, and the access assistance information includes at least cell identification information.

[0295] In some embodiments, the target message is a target MAC CE message, which is an extended LTM cell handover command MAC CE message, and each target MAC CE message includes access assistance information of a candidate cell.

[0296] In some embodiments, the target MAC CE message is a newly configured MAC CE, and the target MAC CE message includes access assistance information of one candidate cell or access assistance information of multiple candidate cells.

[0297] In one embodiment, a processor-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0298] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0299] The processor-readable storage medium can be any available medium or data storage device that can be accessed by the processor, including but not limited to magnetic storage (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO)), optical storage (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (such as ROMs, EPROMs, EEPROMs, non-volatile memories (NAND FLASH), solid-state drives (SSDs)), etc.

[0300] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.

[0301] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0302] These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the processor-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0303] Obviously, those skilled in the art may make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include these modifications and variations.

[0304] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present disclosure, and they should all be included in the scope of the claims and specification of the present disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present disclosure is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A communication method, applied to a terminal, comprising: receiving a target message sent by a network-side device, where the target message includes access assistance information, where the access assistance information is used to assist the terminal in accessing a cell, and the access assistance information includes at least cell identification information; Conditional LTM switching processing is performed based on the access assistance information.

2. The method according to claim 1, wherein The target message is a target MAC CE message, the access assistance information further includes type indication information, and the conditional LTM switching processing based on the access assistance information includes: If it is determined based on the type indication information that the access assistance information is used to provide access assistance information of a candidate cell, locally storing the access assistance information of the candidate cell; If the access conditions are met, conditional LTM switching is performed based on the locally stored access assistance information to access the target cell.

3. The method according to claim 2, wherein: The access assistance information also includes communication parameters. If the access condition is met, conditional LTM handover processing is performed based on the locally stored access assistance information to access the target cell, including: If there is a target cell that meets the execution conditions of conditional LTM switching, and the access assistance information of the target cell is queried locally, the target cell is accessed based on the cell identification information and communication parameters contained in the access assistance information of the target cell, and the communication parameters include at least one of the uplink access timing advance, beam information, and random access resources.

4. The method according to claim 3, wherein: The access assistance information further includes usage conditions; and accessing the target cell based on the cell identification information and communication parameters included in the access assistance information of the target cell includes: determining communication parameters that satisfy the usage conditions; Accessing the target cell based on the identification information of the target cell and the communication parameters that meet the usage conditions.

5. The method according to claim 4, wherein The usage condition includes a usage condition corresponding to a target communication parameter, and the target communication parameter includes the beam information and / or the random access resource.

6. The method according to claim 5, wherein: Accessing the target cell based on the cell identification information and communication parameters included in the access assistance information of the target cell includes: Determining an uplink access timing advance included in the access assistance information of the target cell; Determining target communication parameters that meet usage conditions corresponding to the target communication parameters; Accessing the target cell is performed based on the cell identification information of the target cell, the uplink access timing advance, and the target communication parameter that meets the usage condition corresponding to the target communication parameter.

7. The method according to claim 5, wherein: The communication parameters include uplink access timing advance, beam information, and random access resources, and the target communication parameters include the beam information and the random access resources; Accessing the target cell based on the cell identification information and communication parameters included in the access assistance information of the target cell includes: Determining an uplink access timing advance included in the access assistance information of the target cell; Determining beam information that meets the usage condition corresponding to the beam information; Determining a random access resource that meets a usage condition corresponding to the random access resource; Access the target cell based on the cell identification information of the target cell, the uplink access timing advance, the beam information that meets the usage conditions corresponding to the beam information, and the random access resources that meet the usage conditions corresponding to the random access resources.

8. The method according to any one of claims 4 to 7, wherein: The usage condition is a usage condition based on a signal threshold value or a usage condition based on a time threshold value.

9. The method according to any one of claims 2 to 7, wherein: The target MAC CE message is an extended LTM cell handover command MAC CE message, and each target MAC CE message includes access assistance information of a candidate cell.

10. The method according to any one of claims 2 to 7, wherein: The target MAC CE message is a newly configured MAC CE message, and the target MAC CE message includes access assistance information of one candidate cell or access assistance information of multiple candidate cells.

11. The method according to claim 1, wherein The target message is an extended LTM cell handover command MAC CE message, the target message includes access assistance information of the target cell, the access assistance information also includes communication parameters and type indication information, and the conditional LTM handover processing based on the access assistance information includes: If it is determined that the type indication information is used to instruct the terminal to perform cell handover, the target cell is accessed based on the cell identification information and communication parameters included in the access assistance information of the target cell.

12. The method according to claim 1, wherein The target message is a newly configured MAC CE message, the target message includes access assistance information of the target cell, the access assistance information also includes communication parameters and type indication information, and the conditional LTM switching processing based on the access assistance information includes: If it is determined that the type indication information is used to instruct the terminal to perform cell handover, the target cell is accessed based on the cell identification information and communication parameters included in the access assistance information of the target cell.

13. A communication method, applied to a network-side device, comprising: A target message is sent, where the target message includes access assistance information, and the access assistance information includes at least cell identification information.

14. The method according to claim 13, wherein The target message is a target MAC CE message, which is an extended LTM cell handover command MAC CE message. Each target MAC CE message includes access assistance information of a candidate cell.

15. The method according to claim 13, wherein: The target MAC CE message is a newly configured MAC CE, and the target MAC CE message includes access assistance information of one candidate cell or access assistance information of multiple candidate cells.

16. A communication device, applied to a terminal, comprising: A first receiving unit is configured to receive a target message sent by a network-side device, where the target message includes access assistance information, where the access assistance information is used to assist the terminal in accessing a cell, and the access assistance information includes at least cell identification information; The first processing unit is configured to perform conditional LTM switching processing based on the access assistance information.

17. A communication device, applied to a network-side device, comprising: The first sending unit is used to send a target message, where the target message includes access assistance information, where the access assistance information is used to assist the terminal in accessing a cell, and the access assistance information at least includes cell identification information, so that the terminal performs conditional LTM switching processing based on the access assistance information.

18. A communication device comprising a memory, a transceiver, and a processor: A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations: Receive a target message sent by a network side device, where the target message includes access assistance information, where the access assistance information is used to assist a terminal in accessing a cell, and where the access assistance information includes at least cell identification information; and perform conditional LTM switching processing based on the access assistance information.

19. The device according to claim 18, wherein The target message is a target MAC CE message, the access assistance information further includes type indication information, and the processor is configured to perform the following operations: If it is determined based on the type indication information that the access assistance information is used to provide access assistance information of a candidate cell, locally storing the access assistance information of the candidate cell; If the access conditions are met, conditional LTM switching is performed based on the locally stored access assistance information to access the target cell.

20. The device according to claim 19, wherein The access assistance information further includes communication parameters, and the processor is configured to further perform the following operations: If there is a target cell that meets the execution conditions of conditional LTM switching, and the access assistance information of the target cell is queried locally, the target cell is accessed based on the cell identification information and communication parameters contained in the access assistance information of the target cell, and the communication parameters include at least one of the uplink access timing advance, beam information, and random access resources.

21. The device according to claim 20, wherein The access assistance information further includes a usage condition; and the processor is configured to further perform the following operations: Determining communication parameters that meet the usage conditions; and accessing the target cell based on the identification information of the target cell and the communication parameters that meet the usage conditions.

22. The apparatus according to claim 18, wherein The target message is an extended LTM cell handover command MAC CE message, the target message includes access assistance information of the target cell, the access assistance information also includes communication parameters and type indication information, and the processor is configured to perform the following operations: If it is determined that the type indication information is used to instruct the terminal to perform cell handover, the target cell is accessed based on the cell identification information and communication parameters included in the access assistance information of the target cell.

23. A communication device comprising a memory, a transceiver, and a processor: A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations: A target message is sent, where the target message includes access assistance information, and the access assistance information includes at least cell identification information.

24. The device according to claim 23, wherein The target message is a target MAC CE message, which is an extended LTM cell handover command MAC CE message. Each target MAC CE message includes access assistance information of a candidate cell.

25. The apparatus according to claim 23, wherein The target MAC CE message is a newly configured MAC CE, and the target MAC CE message includes access assistance information of one candidate cell or access assistance information of multiple candidate cells.

26. A computer-readable storage medium having a computer program stored thereon, wherein: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 12 or claims 13 to 15 are implemented.

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