Communication method and apparatus

Abstract

A communication method and apparatus, which relate to the technical field of communications. In the method, in a cell handover process, a serving cell triggers the measurement of reference signal (for example, CSI-RS) resources of a target cell and / or the reporting of a measurement result, such that an access network apparatus corresponding to the target cell can obtain a measurement result of the reference signal resource of the target cell in advance, and can then determine a data scheduling mode for the target cell. Therefore, the reliability and efficiency of data transmission after cell handover is completed (that is, after a handover from the serving cell to the target cell) are improved.

Description

Communication methods and devices

[0001] This application claims priority to Chinese Patent Application No. 202411589146.4, filed on November 7, 2024, entitled "Communication Method and Apparatus", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communication technology, and in particular to a communication method and apparatus. Background Technology

[0003] Currently, access network devices can configure reference signal resources (RSRs) for one or more candidate cells for a terminal. The terminal can then measure these RSRs and report the measurement results for each candidate cell. The measurement results for each candidate cell include the RSR index and corresponding signal strength information (e.g., reference signal received power (RSRP)). Therefore, the access network device can determine whether the terminal should perform a cell handover and which candidate cell (i.e., the target cell) to hand over to based on the measurement results reported by the terminal. However, currently, besides signal strength information, it does not support obtaining more channel state information (CSI) information from candidate cells before or during cell handover. This prevents the access network device from employing appropriate scheduling methods to schedule data to the target cell, thus negatively impacting the reliability and efficiency of data transmission. Summary of the Invention

[0004] This application provides a communication method and apparatus that helps improve the reliability and efficiency of data transmission.

[0005] The present application is described below from different aspects. It should be understood that the different implementation methods and beneficial effects described below can be referenced from each other.

[0006] Firstly, this application provides a communication method that can be applied to a terminal-side communication device, such as a terminal or a communication module / processing module within the terminal, or a circuit or chip in the terminal responsible for communication functions (such as a modem chip, a baseband chip, or a system-on-chip (SoC) chip or system-in-package (SIP) chip containing a modem core), or a circuit or chip in the terminal responsible for processing functions (such as a graphics processing unit (GPU), an artificial intelligence (AI) processor, or an application-specific integrated circuit (ASIC)). Taking the application of this method to a terminal as an example, in this method, the terminal receives first information from the serving cell, which is used to trigger the measurement and / or reporting of the measurement results of the reference signal resources of the target cell after receiving cell handover signaling, wherein the target cell is the candidate cell corresponding to the candidate cell index in the cell handover signaling. Therefore, after receiving cell handover signaling, the terminal can measure the reference signal resources of the target cell to obtain the measurement results, and then send the measurement results to the target cell. Optionally, the terminal can measure the reference signal resources of the target cell before receiving the cell handover signaling, and then send the measurement results to the target cell after receiving the cell handover signaling. For example, the following description mainly uses CSI-RS resources as the reference signal resources for illustrative purposes.

[0007] Optionally, the first information may also be described as triggering the measurement and / or reporting of the CSI-RS resources of the target cell, or as triggering the terminal to perform the measurement and / or reporting of the CSI-RS resources of the target cell, or as triggering the terminal to perform the measurement and / or reporting of the CSI-RS resources of the target cell after receiving cell handover signaling, or as triggering the terminal to perform the measurement and / or reporting of the CSI-RS resources of the target cell after receiving cell handover signaling and before actually handing over to the target cell, or as triggering the terminal to perform the measurement and / or reporting of the CSI-RS resources of the target cell after receiving cell handover signaling and before actually handing over to the target cell. Following the command and before the terminal actually switches to the target cell, the measurement of CSI-RS resources of the target cell and / or the reporting of measurement results are performed. Alternatively, this can be described as the first information used to trigger the measurement of CSI-RS resources of the target cell and / or the reporting of measurement results during cell handover; or as the first information used to trigger the terminal to perform the measurement of CSI-RS resources of the target cell and / or the reporting of measurement results during cell handover; or as the first information used to trigger the measurement of CSI-RS resources of the candidate cell and / or the reporting of measurement results; or as the first information used to trigger the terminal to perform the measurement of CSI-RS resources of the candidate cell and / or the reporting of measurement results. It should be understood that "actually switching to the target cell" as described in this application refers to the terminal successfully accessing the target cell.

[0008] Optionally, the first information involved in this application triggering the measurement of CSI-RS resources of the target cell and / or the reporting of measurement results specifically includes two cases: the first case is that the first information triggers the reporting of measurement results of CSI-RS resources of the target cell; the second case is that the first information triggers both the measurement of CSI-RS resources of the target cell and the reporting of measurement results of CSI-RS resources of the target cell. That is to say, the first information may only trigger the reporting of measurement results (for ease of description, it can be simply described as triggering only the reporting), or the first information may both trigger the measurement and the reporting of measurement results (for ease of description, it can be simply described as triggering both the measurement and the reporting).

[0009] Optionally, in this embodiment, the measurement result of the cell's reference signal resources can be CSI information, such as one or more of the following: channel quality indicator (CQI), precoding matrix indicator (PMI), layer indicator (LI), rank indicator (RI), layer 1 reference signal received power (L1-RSRP), layer 1 signal to interference plus noise ratio (L1-SINR), codebook index i1, etc. The aforementioned L1-RSRP is also called reference signal received power (RSRP), and the aforementioned L1-SINR is also called signal to interference plus noise ratio (SINR).

[0010] In this embodiment, unlike the current implementation where the measurement results (e.g., CQI, PMI, LI, RI, i1, etc.) of the reference signal resources of the new serving cell (i.e., the target cell) can only be obtained after the cell handover is completed, this embodiment proposes that during the cell handover process, the serving cell can trigger the measurement and / or reporting of the reference signal (e.g., CSI-RS) resources of the target cell. This allows the access network device corresponding to the target cell (hereinafter referred to as the second access network device for ease of distinction) to know the measurement results (e.g., CQI, PMI, LI, RI, i1, etc.) of the reference signal resources of the target cell in advance. Therefore, the second access network device can select an appropriate data scheduling method to schedule uplink and downlink data of the target cell after the cell handover is completed based on the obtained measurement results of the reference signal resources of the target cell. This is beneficial to improving the reliability and efficiency of data transmission after the cell handover is completed (i.e., after the handover from the serving cell (or source cell) to the target cell).

[0011] In one possible implementation, the first information includes one or more of the following:

[0012] Information on the triggering status of the serving cell, the report configuration index of the serving cell, the reference signal resource set index of the target cell, or the reference signal resource index of the target cell;

[0013] The triggering state of the serving cell is associated with the reporting configuration of the serving cell. The reference signal resource set associated with the reporting configuration of the serving cell or the reporting configuration index of the serving cell includes the reference signal resources or reference signal resource set of the target cell. The reference signal resource set of the target cell includes the reference signal resources of the target cell.

[0014] Optionally, the trigger status information of the serving cell can be a trigger status index, or other values ​​used to indicate the trigger status. In this implementation, the terminal can determine the CSI-RS resources or CSI-RS resource set of the target cell based on one or more of the following: the candidate cell index in the cell handover signaling, the trigger status information of the serving cell included in the first information, the reporting configuration index of the serving cell, the CSI-RS resource set index of the target cell, and the CSI-RS resource index of the target cell. If the first information only triggers reporting, the terminal can report the measurement results of the CSI-RS resources of the target cell or the CSI-RS resources in the CSI-RS resource set. If the first information triggers both measurement and reporting, the terminal can measure the CSI-RS resources of the target cell or the CSI-RS resources in the CSI-RS resource set to obtain the measurement results of the CSI-RS resources of the target cell, and then report the measurement results of the CSI-RS resources of the target cell. This implementation is highly operable and easy to implement.

[0015] In one possible implementation, the method further includes:

[0016] Based on the trigger status information of the serving cell included in the first information, the reporting configuration index of the serving cell, the reference signal resource set index of the target cell, and one or more of the reference signal resource index of the target cell, the reference signal resource of the target cell is determined. It is understood that, for the terminal, if the first information only triggers reporting, after the terminal determines the reference signal resource of the target cell, the terminal can report the measurement results of the reference signal resource of the target cell. If the first information triggers both measurement and reporting, after the terminal determines the reference signal resource of the target cell, the terminal can measure the reference signal resource of the target cell, obtain the measurement results of the reference signal resource of the target cell, and report the measurement results of the reference signal resource of the target cell.

[0017] In one possible implementation, when the triggering state of the serving cell is associated with a reporting configuration of the serving cell, that reporting configuration is at least associated with a reference signaling resource or a set of reference signaling resources of the target cell; or,

[0018] When the trigger state of the serving cell is associated with multiple reporting configurations of the serving cell, at least one of the multiple reporting configurations is associated with the reference signal resources or set of reference signal resources of the target cell.

[0019] In one possible implementation, prior to receiving the first information from the serving cell, the method further includes:

[0020] The system receives first configuration information from the serving cell, the first configuration information including one or more reporting configurations of the serving cell, wherein one reporting configuration of the serving cell is associated with one or more sets of reference signal resources, the one or more sets of reference signal resources including reference signal resources of one or more candidate cells, and the one or more candidate cells including the target cell.

[0021] In this implementation, the first configuration information includes one or more reporting configurations of the serving cell. By configuring / pre-configuring the association between the reporting configuration of the serving cell and the reference signal resource set of the candidate cell, the terminal can determine the reference signal resources of the target cell based on the candidate cell index in the cell handover signaling and the association between the reporting configuration and the reference signal resource set of the candidate cell. This implementation is beneficial for forward compatibility and is easy to implement.

[0022] In one possible implementation, prior to receiving the first information from the serving cell, the method further includes:

[0023] The system receives second configuration information from the serving cell. The second configuration information is used to configure the association between one or more transmission configuration indicator states (TCI states) of the candidate cells and the trigger state or the reporting configuration of the serving cell. The one or more TCI states of the candidate cells in the association include the TCI state of the target cell corresponding to the TCI state index of the target cell indicated in the cell handover signaling.

[0024] In this implementation, the second configuration information indicates the association between the TCI state of the candidate cell and the trigger state of the serving cell. This is combined with the association between the trigger state of the serving cell and the reporting configuration of the serving cell in the first configuration information, and the association between the reporting configuration of the serving cell and the reference signal resource set of the candidate cell. This allows the terminal to determine the reference signal resources of the target cell based on the TCI state of the target cell corresponding to the TCI state index of the target cell in the cell handover signaling, and the association indicated by the first and second configuration information. This implementation, which implicitly indicates the reference signal resources of the target cell using the TCI state, helps reduce signaling overhead. Alternatively, the second configuration information indicates the association between the TCI state of the candidate cell and the reporting configuration of the serving cell. This is combined with the association between the reporting configuration of the serving cell and the reference signal resource set of the candidate cell in the first configuration information. This allows the terminal to determine the reference signal resources of the target cell based on the TCI state of the target cell corresponding to the TCI state index of the target cell in the cell handover signaling. This implementation, which implicitly indicates the reference signal resources of the target cell using the TCI state, also helps reduce signaling overhead.

[0025] In one possible implementation, the method further includes:

[0026] Receive cell handover signaling from the serving cell, wherein the cell handover signaling includes the TCI state index of the target cell;

[0027] Based on the TCI state of the target cell corresponding to the TCI state index of the target cell, the second configuration information and the first configuration information measure the reference signal resources of the target cell and / or report the measurement results of the reference signal resources of the target cell, wherein the reference signal resources of the target cell are included in the set of reference signal resources associated with the trigger state of the serving cell or the reporting configuration of the serving cell corresponding to the TCI state index of the target cell.

[0028] In one possible implementation, prior to receiving the first information from the serving cell, the method further includes:

[0029] The third configuration information is received from the serving cell. The third configuration information is used to configure the association between one or more TCI states of the candidate cell and the reference signal resources or reference signal resource set of the candidate cell. The one or more TCI states of the candidate cell in the association include the TCI state of the target cell corresponding to the TCI state index of the target cell in the cell handover signaling.

[0030] In this implementation, the third configuration information indicates the association between the TCI state of the candidate cell and the reference signal resources / set of reference signal resources of the candidate cell. This allows the terminal to determine the reference signal resources of the target cell based on the TCI state index of the target cell included in the cell handover signaling and the association indicated in the third configuration information. This approach is highly operable.

[0031] In one possible implementation, the method further includes:

[0032] Receive cell handover signaling from the serving cell, the cell handover signaling including a TCI state index;

[0033] Based on the TCI state corresponding to the TCI state index and the third configuration information, the reference signal resources of the target cell are measured and / or the measurement results of the reference signal resources of the target cell are reported. The reference signal resources of the target cell are the reference signal resources of the candidate cells associated with the TCI state corresponding to the TCI state index or the reference signal resources in the associated reference signal resource set.

[0034] In one possible implementation, the first information is carried in downlink control information (DCI) or a medium access control control element (MAC CE). Optionally, the MAC is also referred to as media access control (MAC). More specifically, the first information is carried in downlink control information that schedules the cell handover signaling, or the first information is carried in the cell handover signaling, or the first information is carried in downlink control information that schedules the first uplink transmission of the target cell.

[0035] In this implementation, the first information is sent by being carried in the existing message / signaling, which helps to save signaling overhead.

[0036] In one possible implementation, when the first information is carried in the cell handover signaling, the cell handover signaling further includes a first field, which is used to indicate whether the first information exists in the cell handover signaling.

[0037] In this implementation, the presence of first information in the cell handover signaling is indicated by the first field, which can assist the terminal in parsing the cell handover signaling and save processing time. For example, when the first field indicates that the first information does not exist in the cell handover signaling, the terminal can stop reading the content of the first information, which helps to improve the terminal's processing efficiency.

[0038] In one possible implementation, the measurement results of the reference signal resources of the target cell are carried in any of the following uplink resources:

[0039] Uplink resources scheduled using uplink grant information carried in the random access response;

[0040] The uplink channel used for the first uplink transmission after switching to the target cell is either scheduled by downlink control information or pre-configured.

[0041] The uplink resources carried in the cell handover signaling are uplink resource information corresponding to uplink resource information, which is uplink authorization information or uplink resource index;

[0042] The pre-configured uplink resources are either uplink resources associated with the reporting configuration of the serving cell included in the first information, or uplink resources associated with the triggering state of the serving cell included in the first information, or pre-configured uplink resources dedicated to the measurement results of the reference signal resources of the target cell for the first time after receiving the cell handover signaling.

[0043] This implementation method has high applicability because it reuses existing uplink resources, configures uplink resources, or pre-configures uplink resources to transmit the measurement results of the reference signal resources of the target cell.

[0044] In one possible implementation, the method further includes:

[0045] Send capability information, which instructs the terminal to support the measurement of reference signal resources of candidate cells triggered by the serving cell and / or the reporting of measurement results.

[0046] Optionally, the capability information can also be described as follows: the capability information is used to instruct the terminal to measure the CSI-RS resources of the candidate cell and then obtain the CSI of the candidate cell before receiving the cell handover signaling; the capability information is used to instruct the terminal to measure the CSI-RS resources of the candidate cell and then obtain the CSI of the candidate cell during the cell handover process; the capability information is used to instruct the terminal to support the serving cell to trigger the CSI acquisition measurement of the candidate cell; the capability information is used to instruct the terminal to support the serving cell to trigger the CSI acquisition measurement and reporting of the candidate cell; or the capability information is used to instruct the terminal to support the maximum number of candidate cells for obtaining CSI before or during cell handover, or the maximum number of candidate cells that can be simultaneously triggered to obtain CSI-RS resource measurements.

[0047] In this embodiment, the terminal reports its ability to measure and / or report the measurement results of the reference signal resources of the candidate cell that it supports the serving cell to trigger, so that the access network device of the serving cell (hereinafter referred to as the first access network device for easy distinction) can trigger the terminal to perform the measurement and / or reporting of the reference signal resources of the target cell after receiving the cell handover signaling through the first information, which is more conducive to the implementation of the scheme.

[0048] Secondly, this application provides a communication method that can be applied to network-side communication devices, such as network-side access network devices, modules (e.g., circuits, chips, or chip systems) within the access network devices, or logic nodes, logic modules, or software capable of implementing all or part of the functions of the access network devices. Taking the application of this method to a first access network device as an example, in this method, the first access network device is an access network device serving a cell. The first access network device determines and sends first information, which is used to trigger the measurement and / or reporting of the measurement results of the reference signal resources of the target cell after receiving cell handover signaling. The target cell is the candidate cell corresponding to the candidate cell index in the cell handover signaling.

[0049] In one possible implementation, before sending the first information, the method further includes:

[0050] Send first configuration information, the first configuration information including one or more report configurations of the serving cell, wherein one report configuration of the serving cell is associated with one or more reference signal resource sets, the one or more reference signal resource sets include reference signal resources of one or more candidate cells, and the one or more candidate cells include the target cell.

[0051] In one possible implementation, the method further includes:

[0052] Send second configuration information, which is used to configure the association between one or more Transmission Configuration Indication (TCI) states of candidate cells and the trigger state or report configuration of the serving cell. The one or more TCI states of candidate cells in the association include the TCI state of the target cell corresponding to the TCI state index of the target cell indicated in the cell handover signaling.

[0053] In one possible implementation, the method further includes:

[0054] Send third configuration information, which is used to configure the association between one or more TCI states of the candidate cell and the reference signal resources or reference signal resource set of the candidate cell. The one or more TCI states of the candidate cell in the association include the TCI state of the target cell corresponding to the TCI state index of the target cell in the cell handover signaling.

[0055] In one possible implementation, the method further includes:

[0056] The terminal receives capability information, which instructs the serving cell supported by the terminal to trigger the acquisition, measurement, and / or reporting of channel state information of candidate cells.

[0057] In one possible implementation, the first information includes one or more of the following:

[0058] Information on the triggering status of the serving cell, the report configuration index of the serving cell, the reference signal resource set index of the target cell, or the reference signal resource index of the target cell;

[0059] The triggering state of the serving cell is associated with the reporting configuration of the serving cell. The reference signal resource set associated with the reporting configuration of the serving cell or the reporting configuration index of the serving cell includes the reference signal resources or reference signal resource set of the target cell. The reference signal resource set of the target cell includes the reference signal resources of the target cell.

[0060] In one possible implementation, when the triggering state of the serving cell is associated with a reporting configuration of the serving cell, that reporting configuration is at least associated with a reference signaling resource or a set of reference signaling resources of the target cell; or,

[0061] When the trigger state of the serving cell is associated with multiple reporting configurations of the serving cell, at least one of the multiple reporting configurations is associated with the reference signal resources or set of reference signal resources of the target cell.

[0062] In one possible implementation, the first information is carried in downlink control information for scheduling the cell handover signaling, or the first information is carried in the cell handover signaling, or the first information is carried in downlink control information for scheduling the first uplink transmission of the target cell.

[0063] In one possible implementation, when the first information is carried in the cell handover signaling, the cell handover signaling further includes a first field, which is used to indicate whether the first information exists in the cell handover signaling.

[0064] In one possible implementation, the measurement results of the reference signal resources of the target cell are carried in any of the following uplink resources:

[0065] Uplink resources scheduled using uplink grant information carried in the random access response;

[0066] The uplink channel used for the first uplink transmission after switching to the target cell is either scheduled by downlink control information or pre-configured.

[0067] The uplink resources carried in the cell handover signaling are uplink resource information corresponding to uplink resource information, which is uplink authorization information or uplink resource index;

[0068] The pre-configured uplink resources are either uplink resources associated with the reporting configuration of the serving cell included in the first information, or uplink resources associated with the triggering state of the serving cell included in the first information, or pre-configured uplink resources dedicated to the measurement results of the reference signal resources of the target cell for the first time after receiving the cell handover signaling.

[0069] Thirdly, this application provides a communication device comprising units, modules, or means for implementing any of the methods in the first to second aspects, or any possible implementations of any of the aspects, wherein the modules, units, or means may be implemented by software, by hardware, or by a combination of software and hardware.

[0070] Fourthly, this application provides a communication device including a processor. The processor is configured to cause the communication device to implement the methods shown in any of the first to second aspects, or any possible implementation thereof.

[0071] Optionally, the communication device further includes a transceiver for sending and receiving information.

[0072] Optionally, the communication device further includes a memory storing computer programs or instructions; the processor and transceiver are used to invoke the computer programs or instructions in the memory, causing the communication device to implement the methods shown in any of the first or second aspects, or any possible implementation of any of the aspects.

[0073] In one possible design, the communication device can be a chip that implements the above method or a device containing a chip.

[0074] Fifthly, this application provides a communication device comprising one or more processors, which implement, via logic circuits or executable code instructions, any of the methods described in the first or second aspects, or any possible implementation thereof.

[0075] Optionally, the communication device further includes an interface circuit for receiving signals from other communication devices outside the communication device and transmitting them to the processor, or sending signals from the processor to other communication devices outside the communication device.

[0076] Optionally, the communication device may further include a memory for storing part or all of the computer programs or instructions necessary to implement the functions involved in the first aspect above.

[0077] The aforementioned communication device may be a terminal, a communication module in a terminal, or a chip in a terminal that is responsible for communication functions, such as a modem chip (also known as a baseband chip) or a SoC or SIP chip that contains a modem module.

[0078] The aforementioned communication device may be an access network device, a module (e.g., a circuit, chip, or chip system) within the access network device, or a logic node, logic module, or software capable of implementing all or part of the functions of the access network device.

[0079] Sixthly, this application provides a computer-readable storage medium storing a computer program or instructions that, when executed by a computer, implement the method shown in any of the first to second aspects, or any possible implementation thereof.

[0080] In a seventh aspect, this application provides a computer program product, including a computer program or instructions, which, when read and executed by a computer, cause the computer to perform any of the methods of the first aspect to the second aspect, or any possible implementation thereof.

[0081] Eighthly, this application provides a chip system including at least one processor and an interface, the processor being configured to read and execute a computer program or instructions in a memory, wherein when the computer program or instructions are executed, the chip performs the method as described in any one of the first or second aspects, or the method shown in any possible implementation of either aspect.

[0082] Ninthly, this application provides a communication system that may include a terminal and an access network device. The terminal is used to perform the method shown in the first aspect or any possible implementation thereof. The access network device is used to perform the method shown in the second aspect or any possible implementation thereof. Attached Figure Description

[0083] Figure 1 is a schematic diagram of the architecture of the communication system used in the embodiments of this application;

[0084] Figure 2 is a schematic diagram of the architecture of the O-RAN system provided in this application;

[0085] Figure 3 is a schematic diagram of the network element function division and protocol layer structure of an O-RAN device provided in this application;

[0086] Figure 4 is a schematic diagram of the structure of the MAC CE for cell handover signaling provided in this application;

[0087] Figure 5 is a flowchart illustrating a communication method provided in an embodiment of this application;

[0088] Figure 6 is another flowchart illustrating the communication method provided in an embodiment of this application;

[0089] Figure 7 is another flowchart illustrating the communication method provided in an embodiment of this application;

[0090] Figure 8 is another flowchart illustrating the communication method provided in an embodiment of this application;

[0091] Figure 9 is a schematic diagram of the structure of a possible communication device provided in an embodiment of this application;

[0092] Figure 10 is a schematic diagram of the structure of a possible communication device provided in an embodiment of this application;

[0093] Figure 11 is a schematic diagram of the structure of a possible communication device provided in an embodiment of this application. Detailed Implementation

[0094] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0095] In the description of this application, terms such as "first" and "second" are used only to distinguish different objects, not to describe a specific order. Furthermore, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Additionally, "at least one" refers to one or more, and "multiple" refers to two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can represent: a, b, c; a and b; a and c; b and c; or a and b and c. Where a, b, and c can be single or multiple.

[0096] The terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0097] In this application, the words "exemplary" or "for example" are used to indicate that something is an example, illustration, or illustration. Any embodiment or design described as "exemplary," "for example," or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the words "exemplary," "for example," or "for example" is intended to present the relevant concepts in a specific manner.

[0098] It is understood that in this application, "when," "if," and "if" all refer to the device making a corresponding action under certain objective circumstances, and are not time-limited, nor do they require the device to make a judgment when it is implemented, nor do they imply any other limitations.

[0099] In this application, the use of singular pronouns for elements is intended to indicate "one or more," rather than "one and only one," unless otherwise specified. The terms "system" and "network" in the embodiments of this application are used interchangeably.

[0100] It is understood that in the embodiments of this application, "B corresponding to A" means that there is a correspondence between A and B, and B can be determined based on A. Determining B based on A does not mean that B can be determined solely based on A; B can also be determined based on A and / or other information.

[0101] To better understand the embodiments of this application, the system architecture involved in the embodiments of this application will be described first below:

[0102] The technical solutions of the embodiments of this application can be applied to various communication systems, such as: Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, and LTE Time Division Duplex (TDD) systems. The technical solutions of the embodiments of this application can also be applied to other communication systems, such as Public Land Mobile Network (PLMN) systems, LTE Advanced (LTE-A) systems, the 5th generation (5G) systems, New Radio (NR) systems, Machine-to-Machine (M2M) systems, or other future communication systems, or other wireless communication systems employing wireless access technologies, all of which can adopt the technical solutions of the embodiments of this application.

[0103] Please refer to Figure 1, which is a schematic diagram of the architecture of the communication system applied in the embodiments of this application. It should be noted that Figure 1 is a possible, non-limiting system schematic diagram. As shown in Figure 1, the communication system 10 includes a radio access network (RAN) 100 and a core network (CN) 200. Optionally, the communication system 10 may also include an Internet 300. RAN 100 includes at least one RAN node (110a and 110b in Figure 1, collectively referred to as 110) and at least one terminal (120a-120j in Figure 1, collectively referred to as 120). RAN 100 may also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in Figure 1). Terminal 120 is wirelessly connected to RAN node 110. RAN node 110 is connected to core network 200 wirelessly or via a wired connection. The core network elements in core network 200 and RAN nodes 110 in RAN 100 can be different physical devices, or they can be the same physical device integrating core network logical functions and radio access network logical functions, or they can be a single physical device integrating some core network element functions and some RAN node 110 functions. Terminals can be interconnected with each other, and RAN nodes 110 can be interconnected with each other via wired or wireless means. Figure 1 is only a schematic diagram. This communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices. Each device may also include different functional units, which are not shown in Figure 1.

[0104] RAN 100 can be a cellular system related to the 3rd Generation Partnership Project (3GPP), such as 4G, 5G mobile communication systems, or future-oriented evolution systems. RAN 100 can also be an open RAN (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (WiFi) system. RAN 100 can also be a communication system that integrates two or more of the above systems.

[0105] RAN node 110, sometimes also referred to as a radio access network device, access network apparatus, RAN entity, or access node, constitutes part of the communication system and is used to help terminals achieve wireless access. Multiple RAN nodes 110 in communication system 10 can be of the same type or different types. In some scenarios, the roles of RAN node 110 and terminal 120 are relative. For example, network element 120i in Figure 1 can be a helicopter or drone, which can be configured as a mobile base station. For terminals 120j accessing RAN 100 through network element 120i, network element 120i is a base station; but for base station 110a, network element 120i is a terminal. RAN node 110 and terminal 120 are sometimes both referred to as communication devices. For example, network elements 110a and 110b in Figure 1 can be understood as communication devices with base station functions, and network elements 120a-120j can be understood as communication devices with terminal functions.

[0106] In one possible scenario, RAN node 110 can be a base station, an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP) or transmit / receive point (TRP), a next-generation NodeB (gNB), a base station in a future mobile communication system, or an access node in a WiFi system. RAN node 110 can be a macro base station (as shown in Figure 1, 110a), a micro base station or indoor station (as shown in Figure 1, 110b), a relay node or donor node, or a radio controller in a CRAN scenario. Optionally, RAN node 110 can also be a server, a wearable device, a vehicle, or in-vehicle equipment. For example, the access network device in vehicle-to-everything (V2X) technology can be a roadside unit (RSU). All or part of the functions of RAN node 110 in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (e.g., a cloud platform). In this application, RAN node 110 can also be a logical node, logical module, or software that can implement all or part of the functions of RAN node 110.

[0107] In another possible scenario, multiple RAN nodes 110 collaborate to assist the terminal in achieving wireless access, with each RAN node 110 implementing a portion of the base station's functions. For example, a RAN node 110 can be a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), etc. CUs and DUs can be set up separately or included in the same network element, such as a baseband unit (BBU). RUs can be included in radio equipment or radio units, such as remote radio units (RRUs), active antenna units (AAUs), or remote radio heads (RRHs).

[0108] In different systems, CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meaning. For example, in an ORAN system, CU can also be called O-CU (open CU), DU can also be called O-DU, CU-CP can also be called O-CU-CP, CU-UP can also be called O-CU-UP, and RU can also be called O-RU. For ease of description, this application uses CU, CU-CP, CU-UP, DU, and RU as examples. Any of the units among CU (or CU-CP, CU-UP), DU, and RU in this application can be implemented through software modules, hardware modules, or a combination of software and hardware modules.

[0109] For example, please refer to Figure 2, which is a schematic diagram of the architecture of the O-RAN system provided in this application. Figure 2 is only a schematic diagram, and the O-RAN system may also include other components besides those shown in Figure 2. As shown in Figure 2, the access network device (e.g., it may be an eNB, gNB, or next-generation access network device) communicates with the core network elements in the CN through a backhaul link and communicates with the terminal through the air interface.

[0110] Specifically, the BBU in the access network device communicates with the core network elements in the CN via a backhaul link, and the RU in the access network device communicates with at least one terminal via an air interface. The BBU communicates with at least one RU via a fronthaul link. The BBU and RU may or may not be co-located. The BBU includes at least one CU and at least one DU, which can communicate via at least one midhaul link.

[0111] Figure 3 illustrates a schematic diagram of the network element function division and protocol layer structure of an O-RAN device. In some examples, the CU is a logical node carrying the radio resource control (RRC) layer, service data adaptation protocol (SDAP) layer, packet data convergence protocol (PDCP) layer, and other control functions of the access network device. The CU connects to network nodes such as the core network through interfaces, which can be interfaces such as E2 interfaces. Optionally, the CU can have some of the functions of the core network. The CU (e.g., the PDCP layer and higher layers) connects to the DU (e.g., the RLC layer and lower layers) through interfaces, which can be interfaces such as F1 interfaces. In some examples, these interfaces (e.g., the F1 interface) can provide control plane (C-Plane) and user plane (U-Plane) functions (e.g., interface management, system information management, UE context management, RRC message transmission, etc.). F1AP is the application protocol of the F1 interface, and in some examples, it defines the signaling procedures of F1. The F1 interface supports the control plane F1-C and the user plane F1-U.

[0112] In some examples, the CU can be split into CU-CP (control unit-control plane) and CU-UP (control unit-user plane). CU-CP is a logical node carrying the RRC layer and PDCP-C (control plane part of PDCP) layer, used to implement the CU's control plane functions. CU-CP can interact with network elements in the core network used to implement control plane functions. These network elements in the core network can be access and mobility function (AMF) network elements, such as the access and mobility management function (AMF) in a 5G system. The AMF network element is responsible for mobility management in the mobile network, such as terminal location updates, terminal registration with the network, and terminal handover. CU-UP is a logical node carrying the SDAP layer and PDCP-U (user plane part of PDCP) layer, used to implement the CU's user plane functions. CU-UP can interact with network elements in the core network used to implement user plane functions. These network elements in the core network, such as the user plane function (UPF) in a 5G system, are responsible for data forwarding and receiving in the terminal. The above CU and DU configurations are merely examples; the functions of the CU and DU can be configured as needed. For instance, the CU or DU can be configured to have more protocol layer functions, or only some protocol layer processing functions. For example, some RLC layer functions and protocol layer functions above the RLC layer can be placed in the CU, while the remaining RLC layer functions and protocol layer functions below the RLC layer can be placed in the DU. Furthermore, the functions of the CU or DU can be divided according to service type or other system requirements, such as by latency. Functions that require low latency can be placed in the DU, while functions that do not require low latency can be placed in the CU.

[0113] In some examples, a DU is a logical node that carries the radio link control (RLC) layer, medium access control (MAC) layer, higher physical layer (Higher PHY) layer, and other functions. In some examples, a DU can control at least one RU. The DU connects to the RU through interfaces, which can be fronthaul interfaces. In some examples, the Higher PHY layer includes the physical (PHY) layer processing, such as forward error correction (FEC) encoding and decoding, scrambling, modulation, and demodulation.

[0114] In some examples, the RU is a logical node that carries both lower physical layer (PHY) and radio frequency (RF) processing. In some examples, the RU can be a 3GPP transmission reception point (TRP), a remote radio head (RRH), or other similar entities. In some examples, the Low-PHY includes PHY processing functions such as Fast Fourier Transform (FFT), Inverse Fast Fourier Transform (IFFT), digital beamforming, and filtering. The RU communicates with one or more terminals via a wireless link.

[0115] The DU and RU can be co-located or not. The DU and RU exchange control plane and user plane information via a fronthaul link through the Lower-Layer Split CUS-Plane (LLS-CUS) interface. LLS-CUS may include LLS-C and LLS-U interfaces providing the control plane (C-Plane) and user plane (U-Plane), respectively. In some examples, the control plane (C-Plane) refers to real-time control between the DU and RU. The DU and RU exchange management information via an LLS-M interface on the fronthaul link; the management plane (M-Plane) refers to non-real-time management operations between the DU and RU.

[0116] DU and RU can cooperate to implement the functions of the PHY layer. A DU can be connected to one or more RUs. The functions of DU and RU can be configured in various ways depending on the design. For example, a DU can be configured to implement baseband functions, and an RU can be configured to implement mid-RF functions. Another example is that a DU can be configured to implement higher-level functions in the PHY layer, and an RU can be configured to implement lower-level functions in the PHY layer, or to implement both lower-level and RF functions. Higher-level functions in the physical layer can include a portion of the physical layer's functions that are closer to the MAC layer, while lower-level functions in the physical layer can include another portion of the physical layer's functions that are closer to the mid-RF side.

[0117] A terminal is a device or module that connects to the aforementioned communication system and possesses corresponding communication functions. Terminals can also be referred to as terminal equipment, user equipment (UE), user devices, access terminals, user units, user stations, mobile stations, mobile stations (MS), remote stations, remote terminals, mobile devices, user terminals, terminal units, terminal stations, terminal devices, wireless communication equipment, user agents, or user devices, etc. Terminals typically contain communication modules, circuits, or chips that perform the corresponding communication functions. They can also be configured with program instructions for performing these functions. Terminals can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), the Internet of Things (IoT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grids, smart furniture, smart offices, smart wearables, smart transportation, and smart cities. The terminal can be a mobile phone, tablet computer, computer with wireless transceiver function, wearable device, vehicle, drone, helicopter, airplane, ship, robot, robotic arm, smart home device, transportation vehicle with wireless communication function, communication module, roadside unit (RSU) with terminal function, etc. The embodiments of this application do not limit the device form of the terminal.

[0118] For ease of description, the following description uses a base station as an example of RAN node 110. Base stations and terminals can be fixed or mobile. Base stations and terminals can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; and they can be deployed on aircraft, balloons, and satellites. The embodiments of this application do not limit the application scenarios of the base stations and terminals.

[0119] The roles of base stations and terminals can be relative. For example, the helicopter or drone 120i in Figure 1 can be configured as a mobile base station. For terminals 120j that access the wireless access network 100 through 120i, terminal 120i is a base station; however, for base station 110a, 120i is a terminal, meaning that 110a and 120i communicate via a wireless air interface protocol. Of course, 110a and 120i can also communicate via a base station-to-base station interface protocol. In this case, relative to 110a, 120i is also a base station. Therefore, both base stations and terminals can be collectively referred to as communication devices. 110a and 110b in Figure 1 can be called communication devices with base station functions, and 120a-120j in Figure 1 can be called communication devices with terminal functions.

[0120] Communication between base stations and terminals, between base stations, and between terminals can be conducted using licensed spectrum, unlicensed spectrum, or both simultaneously. Communication can be conducted using spectrum below 6 GHz, spectrum above 6 GHz, or both simultaneously. The embodiments of this application do not limit the spectrum resources used for wireless communication.

[0121] In the embodiments of this application, the functions of the base station can be executed by modules (such as chips) within the base station, or by a control subsystem that includes base station functions. This control subsystem, including base station functions, can be a control center in the aforementioned application scenarios such as smart grids, industrial control, intelligent transportation, and smart cities. Similarly, the functions of the terminal can be executed by modules (such as chips or modems) within the terminal, or by a device that includes terminal functions.

[0122] In this application, the base station sends downlink signals or downlink information to the terminal, with the downlink information carried on the downlink channel; the terminal sends uplink signals or uplink information to the base station, with the uplink information carried on the uplink channel. To communicate with the base station, the terminal needs to establish a radio connection on a cell controlled by the base station. The cell with which the terminal has established a radio connection is called the terminal's serving cell. When the terminal communicates with this serving cell, it is also susceptible to interference from signals from neighboring cells.

[0123] In this application, "sending information" can be understood as one device sending information to another device, or it can also be understood as one logical module within a device sending information to another logical module. For example, "base station sending information" can be understood as the base station sending information to another device (such as a terminal), or it can be understood as logical module 1 in the base station sending information to logical module 2 in the base station.

[0124] In this application, "receiving information" can be understood as one device receiving information from another device, or it can also be understood as a logical module within a device receiving information from another logical module. For example, "base station receiving information" can be understood as the base station receiving information from another device (such as a terminal), or it can be understood as logical module 1 in the base station receiving information from logical module 2 in the base station.

[0125] The communication between different devices involved in this application can refer to direct communication between different devices (i.e., without the need for relaying or forwarding by other devices), or communication between different devices through other devices (i.e., requiring relaying or forwarding by other devices), or communication between a functional unit within a device and other devices through another functional unit. In other words, "sending information to… (e.g., a terminal)" or the relevant illustrations in the accompanying drawings can be understood as the destination of the information being the terminal. This can include sending information directly or indirectly to the terminal. "Receiving information from… (e.g., a terminal)" or "receiving information from… (e.g., a terminal)" or "receiving information sent (e.g., by a terminal)" or the relevant illustrations in the accompanying drawings can be understood as the source of the information being the terminal. This can include receiving information directly or indirectly from the terminal. Information may undergo necessary processing between the source and destination, such as format changes, analog-to-digital conversion, amplification, filtering, etc., but the destination can understand the valid information from the source. Similar expressions in this application can be understood in a similar way, and will not be elaborated further here.

[0126] To facilitate understanding of the embodiments of this application, some knowledge / terms used in the solutions of this application are introduced below. It should be noted that these explanations are for the purpose of making the embodiments of this application easier to understand, and should not be regarded as limiting the scope of protection claimed by this application.

[0127] 1. TCI-state

[0128] Access network devices can generate different beams pointing in different transmission directions. During downlink data transmission, when an access network device sends data to a terminal using a specific beam, it needs to inform the terminal of the transmitted beam information so that the terminal can use the corresponding received beam to receive the data sent by the access network device. In the 3GPP R15 / R16 protocol, the access network device indicates the relevant information of the transmitted beam used to the terminal through the TCI field in the downlink control information (DCI). Specifically, the TCI field is 3 bits in size and can represent 8 different field values ​​(codepoints). Each value of the TCI field corresponds to a TCI-state index, which uniquely identifies a TCI-state. The TCI-state includes several parameters that determine the relevant information of the transmitted beam. Optionally, in this application, the TCI-state can also be represented as TCI state. The TCI-state is configured by the access network device for each terminal, and its structure is as follows:

[0129] Each TCI-state includes its own index tci-StateId and two QCL-Infos. Each QCL-Info includes a cell field and a bwp-Id, indicating which cell and bandwidth part (BWP) the TCI-state applies to. Different cells or different BWPs within the same cell can be configured with different QCL-Infos. Each QCL-Info also includes a reference signal, indicating which reference signal resource it forms a quasi-co-location (QCL) relationship with. In the R15 / R16 protocols, the term "beam" is generally not used directly; it is usually replaced by other terms. For example, in data transmission and channel measurements, beams correspond to reference signal resources, with one beam corresponding to one reference signal resource. Therefore, when we say that a QCL relationship is formed with a reference signal resource, we are essentially referring to which beam it forms a QCL relationship with. A QCL relationship means that two reference signal resources (or two antenna ports, with a one-to-one correspondence between antenna ports and reference signal resources) share certain spatial parameters. Which spatial parameters are identical depends on the type of the QCL-Info, specifically its other field, qcl-Type. qcl-Type can have four values: {typeA, typeB, typeC, typeD}. Taking typeD as an example, typeD indicates that two reference signal resources have the same spatial reception parameter information, meaning the two beams have the same receiving beam. At most one of the two QCL-Info values ​​included in the TCI-state can be typeD.

[0130] 2. Unified TCI

[0131] Release 17 introduces Unified TCI, a unified beam indication framework. Access network devices can indicate a common beam for a terminal, which can be used simultaneously for multiple channels and / or reference signals. The common beam can be an uplink common beam, a downlink common beam, or an uplink-downlink common beam, which the terminal can use in subsequent transmissions. That is, the access network device can indicate an uplink common beam for the terminal to transmit multiple uplink channels and / or uplink reference signals. It can also indicate a downlink common beam for the terminal to transmit multiple downlink channels and / or downlink reference signals. Alternatively, it can indicate an uplink-downlink common beam for the terminal to transmit multiple uplink channels and / or uplink reference signals, as well as multiple downlink channels and / or downlink reference signals. In other words, the uplink-downlink common beam can be used for both uplink and downlink transmissions.

[0132] In Release 17 and later, terminals can be configured with two TCI states: joint / DL TCI and UL TCI. Here, DL stands for Downlink and UL stands for Uplink.

[0133] The terminal can be configured with joint / DL TCI states (up to 128) and UL TCI states (up to 64) simultaneously.

[0134] In the RRC signaling configuration (serving cell config), the access network device can configure the TCI mode currently used by the terminal as either joint mode or separate mode. In joint mode, it indicates that one joint TCI state can be used for uplink and downlink transmission simultaneously; in separate mode, the access network device needs to indicate that the DL TCI state and UL TCI state are used for uplink and downlink transmission respectively.

[0135] When the terminal receives the TCI state activation signaling indicated by MAC-CE, which includes the TCI state ID, the terminal determines which TCI is activated by MAC-CE according to the RRC configuration.

[0136] 3. Configuration and Pre-configuration

[0137] The application uses both configuration and pre-configuration. Configuration refers to the access network device sending configuration information or parameter values ​​of certain parameters to the terminal via messages or signaling (such as RRC signaling), so that the terminal can determine the communication parameters or resources for transmission based on these values ​​or information. Pre-configuration is similar to configuration; it can be parameter information or parameter values ​​that the access network device and the terminal have negotiated in advance, or it can be parameter information or parameter values ​​used by the access network device or the terminal as specified by standard protocols, or it can be parameter information or parameter values ​​pre-stored in the access network device or the terminal. This application does not limit this. Furthermore, these values ​​and parameters can be changed or updated.

[0138] 4. Resources

[0139] In communication protocols, reference signals are configured in the form of resources. Access network devices configure various reference signals to terminals in the form of resources. Each resource is a configuration information unit, which typically includes parameters related to a reference signal, such as the time-frequency resource location of the reference signal, the number of ports, the time domain type (periodic / semi-static / aperiodic), etc.

[0140] Resources can be either uplink or downlink signal resources. Uplink signals include, but are not limited to, sounding reference signals (SRS) and demodulation reference signals (DMRS). Downlink signals include, but are not limited to, channel state information reference signals (CSI-RS), cell specific reference signals (CS-RS), user equipment specific reference signals (US-RS), demodulation reference signals (DMRS), and synchronization signal / physical broadcast channel block (SS / PBCH block). The SS / PBCH block can be abbreviated as synchronization signal block (SSB).

[0141] In this application, the terms "reference signal" and "reference signal resource" are interchangeable. Similarly, the terms "reference signal index" and "reference signal resource index" are interchangeable.

[0142] 5. Reference signal

[0143] The reference signal can be the reference signal of the serving cell. For example, the serving cell can be a primary cell (Pcell), a secondary cell (Scell), or a primary secondary cell (PScell). Among them, a cell with a primary component carrier (PCC) can be called a Pcell, and a cell with a secondary component carrier (SCC) can be called an Scell.

[0144] The reference signal can be the reference signal of the neighboring cells of the serving cell (such as the reference signal of the cell corresponding to the additional physical cell identifier (additional PCI)).

[0145] Reference signals can also be reference signals associated with the handover candidate cell configuration. Handover candidate cells can also be called candidate cells or neighboring cells. Handover candidate cells can be the current serving cell or a non-serving cell. The physical cell identifier (PCI) of the handover candidate cell is different from that of the current primary cell (PCell).

[0146] The terminal can be configured with one or more candidate cells. The configuration of each candidate cell can include the configuration of reference signal resources. The reference signal can be SSB or CSI-RS, etc. In this embodiment, the reference signal is mainly CSI-RS as an example for illustrative explanation.

[0147] Currently, in mobile communication systems, access network devices configure reference signal resources for one or more candidate cells for terminals. Terminals measure these configured reference signal resources and report the measurement results, which is a common method to help access network devices determine transmission parameters. For example, an access network device may transmit multiple reference signals, which can be transmitted using different time-frequency domain resources or different beams. By measuring and reporting the measurement results of these multiple reference signals, the terminal can help the access network device determine the transmission parameters (such as beam, channel coding rate, etc.) for subsequent communication transmission.

[0148] In scenarios involving terminal movement between multiple cells, the access network device needs to decide whether the terminal should prepare for handover, whether to perform a handover, or which candidate cell to handover to, based on the measurement results of the reference signals of candidate cells (not only geographically but also logically) fed back by the terminal. If the access network device needs to instruct the terminal to handover to a candidate cell, the access network device sends a cell handover signaling to the terminal. Specifically, this involves the following steps:

[0149] Step 1: The access network device sends measurement resources and reports configuration information.

[0150] The access network device sends a report configuration (e.g., LTM-CSI-ReportConfig), which is associated with the reference signal resources of one or more candidate cells. The report configuration also includes the content information to be reported, such as the number of candidate cells L for which the terminal reports measurement results, the number of reference signals M reported by each cell, and whether to report the measurement results of the current serving cell.

[0151] Step 2: The terminal measures the reference signal and reports the measurement results.

[0152] The measurement results include measurements from L cells, with each cell containing measurements of M reference signals. Each reference signal measurement includes a reference signal resource index (e.g., SS / PBCH block resource indicator (SSBRI)) and corresponding signal strength information (e.g., RSRP or differential RSRP). Currently, only SSB resources of candidate cells are supported for measurement, reporting the SSB's RSRP or differential RSRP (i.e., the difference from the reported maximum RSRP).

[0153] Step 3: The access network device sends a cell handover signaling message, instructing the terminal to hand over to the target candidate cell. The cell handover signaling message is a type of MAC CE signaling message, as shown in Figure 4. The cell handover signaling message includes the following information:

[0154] (1) C: Indicates whether the MAC-CE includes contention-free random access (CFRA) related fields (such as Random Access Preamble index, Synchronization Signal Block / Physical Broadcast Channel index (SSB / PBCH index), Physical Random Access Channel Mask index (PRACH Mask index), Secondary Uplink / Normal Uplink (S / U), Repetition Number).

[0155] (2) Target Config ID: Candidate cell index (ltm-CandidateId), indicating that you want to switch to the target candidate cell corresponding to ltm-CandidateId.

[0156] (3) TA command: Timing advance (TA) for the target candidate cell. A value of all 1s in this field indicates invalidity (i.e., no valid TA is indicated).

[0157] (4) TCI state ID: Indicates the TCI state of the target candidate cell (indicates one from the TCI-state list in ltm-candidate);

[0158] (5) UL TCI state ID: Indicates the UL TCI state of the target candidate cell (one is indicated from the UL TCI-state list in ltm-candidate). It exists only in separate mode.

[0159] (6) Random Access Preamble index: Indicates the preamble ID of CFRA, used to trigger CFRA.

[0160] (7) SSB / PBCH index: Indicates the SSB corresponding to CFRA.

[0161] (8) PRACH Mask index: Used to indicate an RO from the random access channel occasion (RACH occasion, RO) associated with the above SSB. When the repetition number is non-zero, the terminal ignores this field.

[0162] (9) Repetition number: The number of times the CFRA preamble is repeated (the field value k indicates that 2 were sent). k (0 indicates no repeated transmission). This field is 2 bits long.

[0163] (10) S / U: Indicates the uplink subcarrier of CFRA. 1 indicates supplementary uplink (SUL), and 0 indicates normal uplink (NUL).

[0164] (11)R: Reserved field.

[0165] This application focuses on three fields (2), (4) and (5) in the cell handover signaling. These will be explained in detail later.

[0166] Currently, it only supports obtaining the RSRP of candidate cells based on SSB measurements before cell handover (the RSRP is generally used to determine one or more beam strengths of candidate cells), but does not support obtaining other CSI information (such as SINR, PMI, RI, LI, CQI, i1, etc.) of candidate cells before or during cell handover. This results in the access network device being unable to use a suitable scheduling method to schedule data to the target cell after cell handover, which is detrimental to the reliability and efficiency of data transmission.

[0167] Based on this, this application proposes a communication method and apparatus that, during cell handover, acquires measurement results of reference signal resources (such as one or more of RSRP, SINR, PMI, RI, LI, CQI, i1, etc.) of candidate cells that serve as the target cell, thereby determining the data scheduling method for the target cell. This is beneficial for improving the reliability and efficiency of data transmission after cell handover.

[0168] It should be noted that in the description of this application, "including" can also be replaced by "instruction" or "configuration," etc. "Instruction" can include direct and indirect instructions, as well as explicit and implicit instructions. The information indicated by a certain piece of information (such as the first information, second information, (instruction) information of the first sub-band, instruction information of the number of sub-bands configuring feedback phase deviation, instruction information of the second sub-band, or instruction information of the number of sub-band intervals, etc., as described below) is called the information to be instructed. In specific implementations, there are many ways to indicate the information to be indicated. For example, the information to be indicated can be directly indicated, where the information to be indicated itself or its index is mentioned. Alternatively, the information to be indicated can be indirectly indicated by indicating other information, where there is a correlation between the other information and the information to be indicated. Another example is that only a part of the information to be indicated can be indicated, while the other parts are known, pre-agreed, or deducible. Furthermore, the instruction of specific information can be achieved by using a pre-agreed (e.g., protocol-defined) arrangement order of various pieces of information, thereby reducing the instruction overhead to some extent.

[0169] In this application, the descriptions of "message" and "signaling" can be used interchangeably; for example, an RRC message can also be called an RRC signaling.

[0170] As described above, in this application, the terms "reference signal" and "reference signal resource" are interchangeable. Similarly, the terms "reference signal index" and "reference signal resource index" are interchangeable. For example, the reference signal resource involved in this application can be a CSI-RS resource, CS-RS resource, US-RS resource, DMRS resource, SSB resource, etc. For ease of understanding, the following description will primarily use CSI-RS resources as the reference signal resource and a CSI-RS resource set as the example for illustrative purposes. Optionally, a reference signal resource set can also be called a reference signal resource list; for example, a CSI-RS resource set can also be called a CSI-RS resource list.

[0171] Optionally, "during cell handover" as described in this application can also be referred to as "during cell handover," and "after cell handover" can also be referred to as "after cell handover." Cell handover as described in this application can also be referred to as handover, or L1 / L2 triggered mobility (LTM) cell handover, etc. RSRP can also be referred to as layer 1 reference signal received power (L1-RSRP), and SINR can also be referred to as layer 1 signal to interference plus noise ratio (L1-SINR).

[0172] Optionally, the reporting configuration of the serving cell in this application can also be simply described as reporting configuration, and the triggering state of the serving cell can also be simply described as triggering state. In this application, "trigger" can also be replaced by "enable", "activate", or "indicate", etc., without limitation.

[0173] The communication method and apparatus provided in this application will be further described below with reference to the accompanying drawings. It is understood that this application uses an access network device and a terminal as examples to illustrate the execution of the interaction, but this application does not limit the execution subject of the interaction. For example, the method executed by the access network device in this application can also be implemented by a module (e.g., a circuit, chip, or chip system) in the access network device, or a logical node, logical module, or software that can implement all or part of the functions of the access network device; the method executed by the terminal in this application can also be implemented by a communication / processing module in the terminal, or a circuit or chip (such as a modem chip (also known as a baseband chip), or a SoC chip / SIP chip containing a modem core, or a GPU / AI processor / ASIC) in the terminal responsible for communication / processing functions.

[0174] Please refer to Figure 5, which is a flowchart illustrating a communication method provided in an embodiment of this application. As shown in Figure 5, the communication method may include the following steps:

[0175] S500: The terminal sends capability information to the first access network device. Correspondingly, the first access network device receives the capability information from the terminal.

[0176] Step S500 is optional. The capability information reported by the terminal can instruct the terminal to support the measurement and / or reporting of the CSI-RS resources of candidate cells triggered by the serving cell, or the capability information can be used to instruct the terminal to support measuring the CSI-RS resources of candidate cells and obtaining the CSI of candidate cells before receiving cell handover signaling, or the capability information can be used to instruct the terminal to support measuring the CSI-RS resources of candidate cells and obtaining the CSI of candidate cells during cell handover, or the capability information can be used to instruct the terminal to support the measurement of CSI acquisition of candidate cells triggered by the serving cell, or the capability information can be used to instruct the terminal to support the measurement and reporting of CSI acquisition of candidate cells triggered by the serving cell, or the capability information can be used to instruct the terminal to support the maximum number of candidate cells for obtaining CSI before or during cell handover, or the maximum number of candidate cells that can be simultaneously triggered to obtain CSI through CSI-RS resource measurement. In the embodiments of this application, CSI can be understood as any one or more of RSRP, SINR, PMI, RI, LI, CQI, and i1.

[0177] Optionally, the determination of terminal capabilities can be as follows: if the terminal reports capability information, it indicates that the terminal supports the capability; if the terminal does not report capability information, it indicates that the terminal does not support the capability. In other words, whether or not the terminal reports capability information indicates whether the terminal supports the corresponding capability. Alternatively, if the terminal reports support for the capability, it indicates that the terminal supports the capability; if the terminal reports no support for the capability, it indicates that the terminal does not support the capability. Alternatively, if the terminal supports certain capabilities, then the terminal must also support another capability; that is, even if the terminal does not report the capability information corresponding to a certain capability, it still indicates that the terminal supports that capability. This application does not impose any limitations.

[0178] In this application, the first access network device is the access network device corresponding to the serving cell. Optionally, in the embodiments of this application, the serving cell may also be referred to as the source cell, or the cell before cell handover, or the cell currently providing services to the terminal, or the cell currently accessed by the terminal. The access network device corresponding to the serving cell may also be referred to as the access network device where the serving cell is located, or the access network device of the serving cell, or the access network device of the source cell, or the source access network device, or the source base station, etc., and is not limited thereto. The number of serving cells may be one or more; this application uses one serving cell as an illustrative example.

[0179] Optionally, the descriptions of the first access network device and the serving cell in this application can be interchanged.

[0180] S501, the first access network device sends first information to the terminal. Correspondingly, the terminal receives the first information from the first access network device.

[0181] The first information is used to trigger the measurement and / or reporting of the CSI-RS resources of the target cell, or it can be described as the first information triggering the terminal to perform the measurement and / or reporting of the CSI-RS resources of the target cell, or it can be described as the first information triggering the measurement and / or reporting of the CSI-RS resources of the target cell after receiving cell handover signaling, or it can be described as the first information triggering the terminal to perform the measurement and / or reporting of the CSI-RS resources of the target cell after receiving cell handover signaling, or it can be described as the first information triggering the measurement and / or reporting of the CSI-RS resources of the target cell after receiving cell handover signaling and before actually handing over to the target cell, or The first information is described as being used to trigger the terminal to perform the measurement and / or reporting of the CSI-RS resources of the target cell after receiving the cell handover signaling and before the terminal actually hands over to the target cell; or it is described as being used to trigger the measurement and / or reporting of the CSI-RS resources of the target cell during the cell handover process; or it is described as being used to trigger the terminal to perform the measurement and / or reporting of the CSI-RS resources of the target cell during the cell handover process; or it is described as being used to trigger the measurement and / or reporting of the CSI-RS resources of the candidate cell; or it is described as being used to trigger the terminal to perform the measurement and / or reporting of the CSI-RS resources of the candidate cell.

[0182] The term "actual handover to the target cell" as described in this application refers to the terminal successfully accessing the target cell. Optionally, "actual handover to the target cell" can also be described as the terminal sending an RRC Reconfiguration Complete message to the second access network device, or as LTM cell handover completion, or cell handover completion, or handover completion, or as the terminal sending its first uplink transmission to the target cell / second access network device. The term "before cell handover" as described in this application can be understood as before receiving cell handover signaling. The term "during cell handover" as described in this application can be understood as after receiving cell handover signaling, and before actually handing over to the target cell.

[0183] Optionally, the first information involved in this application triggering the measurement of CSI-RS resources of the target cell and / or the reporting of measurement results specifically includes two cases: the first case is that the first information triggers the reporting of measurement results of CSI-RS resources of the target cell; the second case is that the first information triggers both the measurement of CSI-RS resources of the target cell and the reporting of measurement results of CSI-RS resources of the target cell. That is to say, the first information may only trigger the reporting of measurement results (for ease of description, it can be simply described as triggering only the reporting), or the first information may both trigger the measurement and the reporting of measurement results (for ease of description, it can be simply described as triggering both the measurement and the reporting).

[0184] In the first scenario, the measurement of the CSI-RS resources of the target cell can be completed before cell handover. Specifically, the CSI-RS resources of the target cell, or the CSI-RS resources in the target cell's CSI-RS resource set, may be periodic CSI-RS resources, semi-persistent CSI-RS resources, or non-periodic CSI-RS resources. For periodic CSI-RS resources, once the CSI-RS resources of the target cell are configured, the first access network device begins to periodically send CSI-RS signals on the configured CSI-RS resources. Therefore, the terminal can begin to perform CSI-RS measurements and obtain measurement results. In this case, during cell handover, the first access network device only needs to trigger the reporting of the measurement results of the periodic CSI-RS resources through the first information. For semi-persistent CSI-RS resources, the first access network device can trigger the measurement of the semi-persistent CSI-RS resources in advance through signaling before cell handover. The terminal performs the measurement and obtains the measurement results. Therefore, during cell handover, the first access network device only needs to trigger the reporting of the measurement results of the semi-persistent CSI-RS resources through the first information. For aperiodic CSI-RS resources, the first access network device can trigger the measurement of aperiodic CSI-RS resources in advance through signaling before cell handover. The terminal performs the measurement and obtains the measurement results. Therefore, during cell handover, the first access network device only needs to trigger the reporting of the measurement results of aperiodic CSI-RS resources through the first information.

[0185] In case (2), the first information needs to trigger the measurement of the CSI-RS resource and the reporting of the measurement results. The CSI-RS resource can be a periodic CSI-RS resource, a semi-persistent CSI-RS resource, or an aperiodic CSI-RS resource. The triggered reporting can be a semi-persistent reporting or an aperiodic reporting.

[0186] Optionally, the measurement results that trigger the reporting may be all the measurement results obtained by the terminal, or they may be some of the measurement results. For example, the terminal may measure the reference signal resources of W1 candidate cells and report the reference signal resources of W2 candidate cells, where W1 and W2 are both integers greater than or equal to 1, and W1 is greater than or equal to W2.

[0187] Optionally, when the value of the first information is a special value, such as all "0"s or all "1"s, it can be understood that the first information does not trigger the measurement and / or reporting of the CSI-RS resources of the target cell; otherwise, the first information triggers the measurement and / or reporting of the CSI-RS resources of the target cell. Optionally, the first information may also include first indication information, which indicates whether to trigger the measurement and / or reporting of the CSI-RS resources of the target cell after receiving the cell handover signaling. For example, the first indication information can be carried by 1 bit in the first information. When the value of the first indication information is "1", it indicates that the measurement and / or reporting of the CSI-RS resources of the target cell is triggered; when the value of the first indication information is "0", it indicates that the measurement and / or reporting of the CSI-RS resources of the target cell is not triggered. For example, when the value of the first indication information is "0", it indicates that the measurement of the CSI-RS resources of the target cell and / or the reporting of the measurement results are triggered; when the value of the first indication information is "1", it indicates that the measurement of the CSI-RS resources of the target cell and / or the reporting of the measurement results are not triggered.

[0188] The target cell is the candidate cell corresponding to the candidate cell index in the cell handover signaling, or it can be understood as the candidate cell indicated by the cell handover signaling, or the candidate cell corresponding to the candidate cell index carried by the Target Config ID field in the cell handover signaling. Optionally, the target cell can also be called the target candidate cell, or the cell after the cell handover is completed, or the cell after the handover is completed, etc., and there is no limitation in this regard. Optionally, the target cell can be one or more candidate cells in the candidate cell list (or candidate cell set). For ease of description, the following text mainly uses one candidate cell in the candidate cell list as the target cell for illustrative purposes. For example, for the first access network device, it can select a cell from the candidate cell list as the target cell, such as the target cell being the cell with the best measurement result. For another example, the target cell can also be a cell randomly selected from the candidate cell list, and this application does not limit this. Optionally, the candidate cells included in the candidate cell list can be understood as cells that the first access network device may switch to. The number of candidate cells in the candidate cell list can be one or more. Typically, candidate cells in the candidate cell list can be neighboring cells of the serving cell, referred to as neighboring cells. Here, proximity is not only geographical but may also be logical. Optionally, the candidate cells in the candidate cell list may also include the current serving cell. Optionally, a candidate cell can be indicated by a candidate cell index (or candidate cell identifier, ID), such as the network-configured ltm-CandidateId or PCI, etc., without limitation.

[0189] For example, the first information can be carried in the DCI or MAC CE. For instance, the first information can be carried in the downlink control information (i.e., DL DCI) of the cell handover signaling, or it can be carried in the cell handover signaling, or it can be carried in the downlink control information of the first uplink transmission of the target cell, or it can be carried in the RAR signaling in RACH-based cell handover, or it can be carried in a newly designed message / signaling, without limitation. Here, DL DCI can be understood as the DCI used for scheduling downlink transmission. Optionally, DL DCI can be any one or more of DCI format1_0, DCI format1_1, DCI format1_2, and DCI format1_3.

[0190] For ease of description, the downlink control information used to schedule cell handover signaling will be referred to as the first downlink control information, and the downlink control information used to schedule the first uplink transmission of the target cell will be referred to as the second downlink control information. In the embodiments of this application, the first uplink transmission of the target cell scheduled by the second downlink control information can be understood as the first dynamically scheduled physical downlink shared channel (PUSCH) after handover to the target cell. Optionally, this first dynamically scheduled PUSCH can be a PUSCH carrying an RRCReconfigurationComplete message.

[0191] Optionally, the aforementioned first information may exist only if one or more of the following conditions are met; otherwise, it may not exist: 1. After receiving cell handover signaling, the serving cell triggers the measurement and / or reporting of CSI-RS resources of the candidate cell. 2. After receiving cell handover signaling, the serving cell triggers the measurement and / or reporting of CSI (or CSI other than RSRP / SINR) acquisition of the candidate cell. 3. The configuration information of the first access network device in the serving cell includes the configuration of CSI-RS resources of the candidate cell for CSI (or CSI other than RSRP / SINR) acquisition. 4. The configuration information of the first access network device in the serving cell includes the report configuration (ReportConfig) for at least one reported quantity among PMI / CQI / RI / LI / i1 associated with the CSI-RS resources of the candidate cell.

[0192] The above explanation of the first information and the explanation of related content also apply to the understanding of the first information in the embodiments shown in Figures 6 to 8 below, and the relevant parts will not be repeated hereafter.

[0193] The two design methods for the first information will be explained below.

[0194] In one possible design ①, the first information may include one or more of the following: information on the serving cell's trigger state, the serving cell's report configuration index (e.g., LTM-CSI-ReportConfigId), the target cell's CSI-RS resource set index, or the target cell's CSI-RS resource index. Optionally, the number of serving cell trigger state information, the number of serving cell report configuration indexes, the number of target cell CSI-RS resource set indexes, or the number of target cell CSI-RS resource indexes included in the first information may be more than one, and this application does not limit this. That is, the first information may include one or more of the following: information on one or more serving cell trigger states, one or more serving cell report configuration indexes, one or more target cell CSI-RS resource set indexes, or one or more target cell CSI-RS resource indexes. Optionally, the first information may also indicate one or more of the following: the number of serving cell trigger state information, the number of serving cell report configuration indexes, the number of target cell CSI-RS resource set indexes, or the number of target cell CSI-RS resource indexes.

[0195] In one possible implementation (I), the first information may include information on the trigger state of the serving cell, the report configuration index of the serving cell (e.g., LTM-CSI-ReportConfigIDReportConfigId), the CSI-RS resource set index of the target cell, or any one of the CSI-RS resource index of the target cell.

[0196] In one possible implementation (ⅠⅠ), the first information may include the report configuration index of the serving cell (e.g., LTM-CSI-ReportConfigIDReportConfigId) and the CSI-RS resource set index of the target cell.

[0197] In one possible implementation (ⅠⅢⅠ), the first information may include the report configuration index of the serving cell (e.g., LTM-CSI-ReportConfigIDReportConfigId) and the CSI-RS resource index of the target cell.

[0198] In one possible implementation (IV), the first information may include information about the serving cell's trigger state and a reporting configuration index for the serving cell.

[0199] In one possible implementation (V), the first information may include the CSI-RS resource set index of the target cell and the CSI-RS resource index of the target cell.

[0200] Optionally, the trigger status information of the serving cell can be a trigger status index, where one trigger status index corresponds to one trigger status. Alternatively, the trigger status information of the serving cell can also be other values ​​used to indicate the trigger status, where one trigger status value corresponds to one trigger status. That is, the trigger status can be indicated by directly indicating the trigger status index. For example, a trigger status list can be configured, which includes one or more trigger statuses, each corresponding to a trigger status index, which can be determined based on the position of the trigger status in the trigger status list. Alternatively, the trigger status can also be indicated by the value of the CSI request field. For example, the CSI request field can be indicated using N bits, and the first access network device can configure a trigger status list where the number of trigger statuses in the list is greater than 2. N -1. First, activate some trigger states in the trigger state list via MAC CE, then select an effective trigger state from the activated trigger states using the CSI request field. At this time, the value of CSI request corresponds to one trigger state; when the number of trigger states in the trigger state list is no more than 2... N -1, CSI request directly selects a trigger state from the trigger state list.

[0201] For example, the cell handover signaling may include the aforementioned trigger status index or CSI request field. As another example, the first downlink control information may include the aforementioned CSI request field.

[0202] A trigger state can be associated with one or more report configurations, and a report configuration can be associated with one or more CSI-RS resources or one or more sets of CSI-RS resources. Each CSI-RS resource set may include one or more CSI-RS resources. Optionally, the association between trigger states and report configurations can be pre-configured or configured, and the association between report configurations and CSI-RS resources or sets of CSI-RS resources can also be configured or pre-configured.

[0203] In this embodiment, the CSI-RS resource set associated with the reporting configuration of the serving cell associated with the trigger state of the serving cell includes the CSI-RS resources or CSI-RS resource set of the target cell. Specifically, when the trigger state of the serving cell is associated with a reporting configuration of the serving cell, the reporting configuration is associated with at least the CSI-RS resources or CSI-RS resource set of the target cell. Optionally, "at least associated with the CSI-RS resources or CSI-RS resource set of the target cell" can be understood as including not only the CSI-RS resources or CSI-RS resource set of the target cell, but also the CSI-RS resources or CSI-RS resource sets of other candidate cells.

[0204] For example, if the trigger state of the serving cell is associated with only one reporting configuration of the serving cell, and that one reporting configuration is associated with only one candidate cell's CSI-RS resource or CSI-RS resource set, then that candidate cell is the target cell. As another example, if the trigger state of the serving cell is associated with only one reporting configuration of the serving cell, and that one reporting configuration is associated with multiple candidate cells' CSI-RS resources or CSI-RS resource sets, then those multiple candidate cells include the target cell.

[0205] When a serving cell's trigger state is associated with multiple reporting configurations for that serving cell, at least one of these multiple reporting configurations must be associated with the target cell's CSI-RS resources or a set of CSI-RS resources. Optionally, "at least one of these multiple reporting configurations must be associated with the target cell's CSI-RS resources or a set of CSI-RS resources" can be understood as including not only reporting configurations associated with the target cell's CSI-RS resources or a set of CSI-RS resources, but also reporting configurations associated with the CSI-RS resources or a set of CSI-RS resources of other cells.

[0206] For example, when the trigger state of a serving cell is associated with multiple reporting configurations for that serving cell, and each reporting configuration is associated with the CSI-RS resources or CSI-RS resource set of a candidate cell, then at least one of these multiple reporting configurations is associated with the CSI-RS resources or CSI-RS resource set of the target cell. Similarly, when the trigger state of a serving cell is associated with multiple reporting configurations for that serving cell, and at least one reporting configuration is associated with the CSI-RS resources of multiple candidate cells, then at least one of these multiple reporting configurations is associated with the CSI-RS resources or CSI-RS resource set of the target cell.

[0207] One report configuration index corresponds to one report configuration. In this application, the CSI-RS resources or CSI-RS resource set associated with the report configuration corresponding to the report configuration index of the serving cell include the CSI-RS resources or CSI-RS resource set of the target cell. Specifically, when a report configuration is associated with only one candidate cell's CSI-RS resources or CSI-RS resource set, that candidate cell is the target cell. When a report configuration is associated with multiple candidate cells' CSI-RS resources or CSI-RS resource sets, those multiple candidate cells include the target cell.

[0208] Understandably, one CSI-RS resource set index corresponds to one CSI-RS resource set, and one CSI-RS resource index corresponds to one CSI-RS resource index. Generally speaking, the CSI-RS resource set of the target cell includes one or more CSI-RS resources of the target cell.

[0209] Under design ①, for the terminal, it can determine the CSI-RS resources or CSI-RS resource set of the target cell based on / according to one or more of the following information included in the first information: the trigger status information of the serving cell, the reporting configuration index of the serving cell, the CSI-RS resource set index of the target cell, and the CSI-RS resource index of the target cell. Optionally, it can also combine the target cell indicated by the candidate cell index in the cell handover signaling. When the first information only triggers reporting, the terminal can report the measurement results of the CSI-RS resources of the target cell or the CSI-RS resources in the CSI-RS resource set. When the first information triggers both measurement and reporting, the terminal can measure the CSI-RS resources of the target cell or the CSI-RS resources in the CSI-RS resource set to obtain the measurement results of the CSI-RS resources of the target cell, and then report the measurement results of the CSI-RS resources of the target cell.

[0210] In one possible implementation (Ⅰ-1), when the first information includes information about the triggering state of the serving cell, the terminal can determine one or more reporting configurations of the serving cell associated with one or more triggering states of the serving cell included in the first information, based on the association between the configured or pre-configured triggering states and reporting configurations. Then, based on the association between the configured or pre-configured reporting configurations and CSI-RS resource sets, the terminal determines one or more CSI-RS resource sets associated with each reporting configuration of the serving cell associated with one or more triggering states of the serving cell. Further, by combining the target cell indicated by the candidate cell index in the cell handover signaling, the terminal selects the CSI-RS resources or CSI-RS resource set of the target cell from the determined one or more CSI-RS resource sets.

[0211] In one possible implementation (Ⅰ-2), when the first information includes a report configuration index of the serving cell, the terminal can determine, based on the association between the configured or pre-configured report configuration and the CSI-RS resource set, one or more CSI-RS resource sets associated with each of the one or more report configurations corresponding to the serving cell included in the first information. Further, by combining the target cell indicated by the candidate cell index in the cell handover signaling, the CSI-RS resources or CSI-RS resource set of the target cell are determined from the determined one or more CSI-RS resource sets.

[0212] In one possible implementation (Ⅰ-3), when the first information includes the CSI-RS resource set index of the target cell, the terminal can directly determine one or more corresponding CSI-RS resource sets as the CSI-RS resource set of the target cell based on one or more CSI-RS resource set indexes of the target cell included in the first information.

[0213] In one possible implementation (Ⅰ-4), when the first information includes the CSI-RS resource index of the target cell, the terminal can directly determine one or more corresponding CSI-RS resources as the CSI-RS resources of the target cell based on one or more CSI-RS resource indices of the target cell included in the first information.

[0214] In one possible implementation (ⅠⅠ), when the first information includes the reporting configuration index of the serving cell and the CSI-RS resource set index of the target cell, the terminal can determine, based on the association between the configured or pre-configured reporting configuration and the CSI-RS resource set, one or more CSI-RS resource sets associated with each of the one or more reporting configurations corresponding to the one or more reporting configuration indices of the serving cell included in the first information. Then, based on the CSI-RS resource set index of the target cell, the CSI-RS resource set corresponding to the CSI-RS resource set index determined from the aforementioned one or more CSI-RS resource sets is identified as the CSI-RS resource set corresponding to the target cell.

[0215] In one possible implementation (ⅠⅢⅠ), when the first information includes the reporting configuration index of the serving cell and the CSI-RS resource index of the target cell, the terminal can determine, based on the association between the configured or pre-configured reporting configuration and the CSI-RS resource set, one or more CSI-RS resource sets associated with each of the one or more reporting configurations corresponding to one or more reporting configurations of the serving cell included in the first information. Then, according to the CSI-RS resource index of the target cell, the terminal selects the CSI-RS resource corresponding to the CSI-RS resource index of the target cell from the aforementioned determined CSI-RS resource set as the CSI-RS resource of the target cell.

[0216] In one possible implementation (IV), when the first information may include information about the trigger state of the serving cell and the reporting configuration index of the serving cell, the terminal can determine one or more reporting configurations of the serving cell associated with one or more trigger states of the serving cell included in the first information based on the association between the configured or pre-configured trigger states and reporting configurations. Then, according to the one or more reporting configuration indices of the serving cell included in the first information, the terminal selects the reporting configuration corresponding to the reporting configuration index from the one or more reporting configurations associated with the aforementioned trigger states. Furthermore, based on the reporting configuration corresponding to the reporting configuration index, and combined with the association between the configured or pre-configured reporting configurations and CSI-RS resource sets, the terminal determines one or more CSI-RS resource sets associated with the reporting configuration corresponding to the reporting configuration index. Further, according to the target cell indicated by the candidate cell index in the cell handover signaling, the terminal determines the CSI-RS resources or CSI-RS resource set of the target cell from the one or more CSI-RS resource sets associated with the reporting configuration corresponding to the reporting configuration index.

[0217] In one possible implementation (V), when the first information includes the CSI-RS resource set index of the target cell and the CSI-RS resource index of the target cell, the terminal can directly determine one or more CSI-RS resource sets corresponding to the target cell based on one or more CSI-RS resource set indexes of the target cell included in the first information, and then select one or more CSI-RS resources corresponding to one or more CSI-RS resource indexes of the target cell as the CSI-RS resources of the target cell based on one or more CSI-RS resource set indexes of the target cell included in the first information.

[0218] For example, when the first information is carried on the first downlink control information, the terminal can, after receiving the cell handover signaling, determine the CSI-RS resource or CSI-RS resource set of the target cell based on the target cell indicated by the candidate cell index in the cell handover signaling, and in combination with one or more of the information included in the first information carried by the first downlink control information, such as the trigger status information of the serving cell, the report configuration index of the serving cell, the CSI-RS resource set index of the target cell, and the CSI-RS resource index of the target cell. The specific implementation of the terminal determining the CSI-RS resource or CSI-RS resource set of the target cell based on one or more of the information included in the first information, such as the trigger status information of the serving cell, the report configuration index of the serving cell, the CSI-RS resource set index of the target cell, and the CSI-RS resource index of the target cell, can refer to the aforementioned possible implementations (Ⅰ-1), (Ⅰ-2), (Ⅰ-3), (Ⅰ-4), (ⅠⅠ), (ⅠⅠⅠ), (ⅠV), or (V), which will not be elaborated here.

[0219] For another example, when the first information is carried in the cell handover signaling, the terminal can, after receiving the cell handover signaling, determine the CSI-RS resources or CSI-RS resource set of the target cell based on the target cell indicated by the candidate cell index in the cell handover signaling, and one or more of the information included in the first information carried in the cell handover signaling, such as the trigger status information of the serving cell, the report configuration index of the serving cell, the CSI-RS resource set index of the target cell, and the CSI-RS resource index of the target cell. Regarding the specific implementation of the terminal determining the CSI-RS resources or CSI-RS resource set of the target cell based on one or more of the information included in the first information, such as the trigger status information of the serving cell, the report configuration index of the serving cell, the CSI-RS resource set index of the target cell, and the CSI-RS resource index of the target cell, the implementation can refer to the aforementioned possible implementations (Ⅰ-1), (Ⅰ-2), (Ⅰ-3), (Ⅰ-4), (ⅠⅠ), (ⅠⅠⅠ), (ⅠV), or (V), which will not be elaborated here.

[0220] For another example, when the first information is carried in the second downlink control information, the terminal can, after receiving the cell handover signaling and the second downlink control information, determine the CSI-RS resources or CSI-RS resource set of the target cell based on the target cell indicated by the candidate cell index in the cell handover signaling, and in combination with one or more of the information included in the first information carried by the second downlink control information, such as the trigger status information of the serving cell, the report configuration index of the serving cell, the CSI-RS resource set index of the target cell, and the CSI-RS resource index of the target cell. The specific implementation of the terminal determining the CSI-RS resources or CSI-RS resource set of the target cell based on one or more of the information included in the first information, such as the trigger status information of the serving cell, the report configuration index of the serving cell, the CSI-RS resource set index of the target cell, and the CSI-RS resource index of the target cell, can refer to the aforementioned possible implementations (Ⅰ-1), (Ⅰ-2), (Ⅰ-3), (Ⅰ-4), (ⅠⅠ), (ⅠⅠⅠ), (ⅠV), or (V), which will not be elaborated here.

[0221] For example, taking the target cell indicated by the cell handover signaling as candidate cell 1, assuming that the first information includes the trigger state index 1 of the serving cell, which corresponds to trigger state 1, and trigger state 1 is associated with report configuration 1, which is associated with the CSI-RS resources or CSI-RS resource set of candidate cell 1 and the CSI-RS resources or CSI-RS resource set of candidate cell 2, then the terminal can determine that the CSI-RS resources of the target cell are the CSI-RS resources of candidate cell 1 or the CSI-RS resources included in the CSI-RS resource set of candidate cell 1.

[0222] For example, taking the target cell indicated by the cell handover signaling as candidate cell 1, assuming that the first information includes the trigger state index 1 of the serving cell, which corresponds to trigger state 1, trigger state 1 is associated with report configuration 1 and report configuration 2. Report configuration 1 is associated with the CSI-RS resources or CSI-RS resource set of candidate cell 1, and report configuration 2 is associated with the CSI-RS resources or CSI-RS resource set of candidate cell 2. Then the terminal can determine that the CSI-RS resources of the target cell are the CSI-RS resources of candidate cell 1 or the CSI-RS resources included in the CSI-RS resource set of candidate cell 1.

[0223] For example, if the target cell indicated by the cell handover signaling is candidate cell 1, and the first information includes the report configuration index 1 of the serving cell, which corresponds to report configuration 1, where report configuration 1 is associated with the CSI-RS resources or CSI-RS resource set of candidate cell 1 and the CSI-RS resources or CSI-RS resource set of candidate cell 2, then the terminal can determine that the CSI-RS resources of the target cell are the CSI-RS resources of candidate cell 1 or the CSI-RS resources included in the CSI-RS resource set of candidate cell 1.

[0224] For example, suppose the first information includes CSI-RS resource set index 1 of the target cell. This CSI-RS resource set index 1 corresponds to CSI-RS resource set 1. Therefore, the terminal can determine that the CSI-RS resources of the target cell are the CSI-RS resources included in CSI-RS resource set 1. For instance, if CSI-RS resource set 1 includes CSI-RS resource 1, CSI-RS resource 2, CSI-RS resource 3, CSI-RS resource 4, and CSI-RS resource 5, then CSI-RS resource 1, CSI-RS resource 2, CSI-RS resource 3, CSI-RS resource 4, and CSI-RS resource 5 are the CSI-RS resources of the target cell.

[0225] For example, suppose the first information includes CSI-RS resource index 1 and CSI-RS resource index 2 of the target cell. CSI-RS resource index 1 corresponds to CSI-RS resource 1, and CSI-RS resource index 2 corresponds to CSI-RS resource 2. Therefore, the terminal can determine that the CSI-RS resources of the target cell are CSI-RS resource 1 and CSI-RS resource 2.

[0226] For example, taking the above-mentioned information included in the first information as an example, it can be combined with each other. Suppose that the first information includes the report configuration index 1 of the serving cell and the CSI-RS resource set index 1 of the target cell. The report configuration 1 corresponding to the report configuration index 1 is associated with the CSI-RS resource set 1 and the CSI-RS resource set 2 of the target cell. The CSI-RS resource set index 1 of the target cell corresponds to the CSI-RS resource set 1 of the target cell, and the CSI-RS resource set index 2 of the target cell corresponds to the CSI-RS resource set 2 of the target cell. Therefore, the terminal can determine that the CSI-RS resource of the target cell is the CSI-RS resource in the CSI-RS resource set 1 of the target cell associated with the report configuration 1 corresponding to the report configuration index 1 of the serving cell.

[0227] For example, considering the various pieces of information included in the first information, they can be combined. Assume the first information includes the serving cell's report configuration index 1 and the target cell's CSI-RS resource index 1, where report configuration index 1 corresponds to report configuration 1, and CSI-RS resource index 1 corresponds to CSI-RS resource 1. Furthermore, report configuration 1 corresponding to report configuration index 1 is associated with the target cell's CSI-RS resource set 1 and target cell's CSI-RS resource set 2. CSI-RS resource set 1 includes CSI-RS resource 1, CSI-RS resource 2, CSI-RS resource 3, CSI-RS resource 4, and CSI-RS resource 5; CSI-RS resource set 2 includes CSI-RS resource 6, CSI-RS resource 7, CSI-RS resource 8, CSI-RS resource 9, and CSI-RS resource 10. Therefore, the terminal can determine that the target cell's CSI-RS resource is CSI-RS resource 1.

[0228] For example, taking the above-mentioned information included in the first information as an example, it can be combined with each other. Suppose that the first information includes the trigger state index 1 of the serving cell and the report configuration index 1 of the serving cell. The trigger state index 1 of the serving cell is associated with the report configuration 1 and the report configuration 2 of the serving cell. The report configuration 1 of the serving cell is associated with the CSI-RS resource set 1 of the target cell. The report configuration 2 of the serving cell is associated with the CSI-RS resource set 2 of the target cell. Therefore, the terminal can determine that the CSI-RS resource of the target cell is the CSI-RS resource in the CSI-RS resource set 1 of the target cell associated with the report configuration 1 of the serving cell.

[0229] For example, considering the various types of information included in the first information, which can be combined with each other, suppose the first information includes CSI-RS resource set index 1, CSI-RS resource index 1, and CSI-RS resource index 2 of the target cell. CSI-RS resource set index 1 corresponds to CSI-RS resource set 1, CSI-RS resource index 1 corresponds to CSI-RS resource 1, and CSI-RS resource index 2 corresponds to CSI-RS resource 2. CSI-RS resource set 1 includes CSI-RS resource 1, CSI-RS resource 2, CSI-RS resource 3, CSI-RS resource 4, and CSI-RS resource 5. Therefore, the terminal can determine that the CSI-RS resources of the target cell are CSI-RS resource 1 and CSI-RS resource 2 within CSI-RS resource set 1.

[0230] Optionally, when the first information is carried in the cell handover signaling, the cell handover signaling may further include a first field. The first field indicates whether the first information exists in the cell handover signaling, or whether the measurement and / or reporting of the target cell's CSI-RS resources is triggered after receiving the cell handover signaling, or whether the measurement and / or reporting of the target cell's CSI-RS resources is triggered. For example, the length of the first field can be 1 bit. For instance, when the value of the 1 bit is "1", it indicates that the cell handover signaling contains the first information, or indicates that the measurement and / or reporting of the target cell's CSI-RS resources is triggered; when the value of the 1 bit is "0", it indicates that the cell handover signaling does not contain the aforementioned first information, or indicates that the measurement and / or reporting of the target cell's CSI-RS resources is not triggered. For example, when the value of this 1-bit is "0", it indicates that the cell handover signaling contains first information, or it is used to indicate the triggering of CSI-RS resource measurement and / or the reporting of measurement results for the target cell; when the value of this 1-bit is "1", it indicates that the cell handover signaling does not contain the aforementioned first information, or it is used to indicate that the CSI-RS resource measurement and / or the reporting of measurement results for the target cell is not triggered. Optionally, the length of the first bit can also be 2 bits or 3 bits, etc., and this application does not limit the length of the first field. This method of indicating the presence of first information in the cell handover signaling through the first field can assist the terminal in parsing the cell handover signaling, thereby saving the processing time of the cell handover signaling. For example, when the first field indicates that the first information does not exist in the cell handover signaling, the terminal can stop reading the content of the first information, which is beneficial to improving the terminal processing efficiency.

[0231] In one possible design ②, for the terminal, it can determine the CSI-RS resources or CSI-RS resource set of the target cell based on the TCI state index of the target cell in the cell handover signaling. The TCI state corresponding to the TCI state index of the target cell in the cell handover signaling is the TCI state of the target cell. If only reporting is triggered by the first information, the terminal can report the measurement results of the CSI-RS resources of the target cell or the CSI-RS resources in the CSI-RS resource set. If both measurement and reporting are triggered by the first information, the terminal can measure the CSI-RS resources of the target cell or the CSI-RS resources in the CSI-RS resource set, obtain the measurement results of the CSI-RS resources of the target cell, and then report the measurement results of the CSI-RS resources of the target cell. For example, the following three implementation methods may exist:

[0232] In method (1), the terminal can determine the CSI-RS resources or CSI-RS resource set of the candidate cell associated with the TCI state corresponding to the TCI state index of the target cell in the cell handover signaling, based on the association relationship between the TCI state of the candidate cell configured or pre-configured and the CSI-RS resources or CSI-RS resource set of the candidate cell. Optionally, the association relationship between the TCI state configured or pre-configured and the CSI-RS resources or CSI-RS resource set in method (1) is the association relationship between the TCI state of the same candidate cell and the CSI-RS resources or CSI-RS resource set of the candidate cell. Here, the candidate cell includes the target cell. For example, taking candidate cell 1 as an example, the third configuration information is used to configure the association relationship between one or more TCI states of candidate cell 1 and the CSI-RS resources or CSI-RS resource set of candidate cell 1.

[0233] For example, suppose the association between the configured or pre-configured TCI state and the CSI-RS resource set of the candidate cell is as follows: TCI state1 of candidate cell 1 is associated with CSI-RS resource set 1 of candidate cell 1, and TCI state2 of candidate cell 1 is associated with CSI-RS resource set 2 of candidate cell 1. In the cell handover signaling, the TCI state index of the target cell is TCI state index 1, which corresponds to TCI state1 of the target cell. Therefore, it can be determined that the CSI-RS resource set of the target cell is CSI-RS resource set 1 of candidate cell 1. In this example, candidate cell 1 is the target cell.

[0234] In method (2), the terminal can determine the CSI-RS resources or CSI-RS resource set of the target cell associated with the report configuration of the TCI state corresponding to the TCI state index of the target cell in the cell handover signaling as the target cell's CSI-RS resources or CSI-RS resource set, based on the association between the TCI state of the candidate cell and the report configuration of the serving cell, which is configured or pre-configured, and the association between the report configuration of the serving cell and the CSI-RS resources or CSI-RS resource set. Optionally, the TCI state of the candidate cell in the association configured or pre-configured in method (2) includes the TCI state of the target cell.

[0235] For example, suppose the relationship between the configured or pre-configured TCI state of a candidate cell and the reporting configuration of the serving cell is as follows: the TCI state1 of the target cell is associated with the reporting configuration 1 of the serving cell, and the TCI state2 of the target cell is associated with the reporting configuration 2 of the serving cell. Also suppose the relationship between the configured or pre-configured reporting configuration of the serving cell and the CSI-RS resource set is as follows: the reporting configuration 1 of the serving cell is associated with the CSI-RS resource set 1 of the target cell, and the reporting configuration 2 of the serving cell is associated with the CSI-RS resource set 2 of the target cell. In the cell handover signaling, the TCI state index of the target cell is TCI state index 1, which corresponds to the TCI state1 of the target cell. Therefore, the CSI-RS resource set of the target cell can be determined as the CSI-RS resource set 1 of the target cell.

[0236] In method (3), the terminal can, based on the association between the TCI state of the candidate cell and the trigger state of the serving cell, the association between the trigger state of the serving cell and the report configuration of the serving cell, and the association between the report configuration of the serving cell and CSI-RS resources or a set of CSI-RS resources, first determine the trigger state associated with the TCI state of the target cell corresponding to the TCI state index of the target cell in the cell handover signaling, then determine the report configuration associated with the trigger state, and then use the CSI-RS resources of the target cell or the CSI-RS resource set associated with the report configuration as the CSI-RS resources of the target cell. Optionally, the TCI state of the candidate cell in the association configured or pre-configured in method (3) includes the TCI state of the target cell.

[0237] For example, suppose the association between the configured or pre-configured TCI state of a candidate cell and the trigger state of the serving cell is as follows: the TCI state1 of the target cell is associated with the trigger state1 of the serving cell, and the TCI state2 of the target cell is associated with the trigger state2 of the serving cell. Also suppose the association between the configured or pre-configured trigger state of the serving cell and the reporting configuration of the serving cell is as follows: the trigger state1 of the serving cell is associated with the reporting configuration1 of the serving cell, and the trigger state2 of the serving cell is associated with the reporting configuration2 of the serving cell. Furthermore suppose the association between the configured or pre-configured reporting configuration of the serving cell and the CSI-RS resource set of the target cell is as follows: the reporting configuration1 of the serving cell is associated with the CSI-RS resource set1 of the target cell, and the reporting configuration2 of the serving cell is associated with the CSI-RS resource set2 of the target cell. In the cell handover signaling, the TCI state index of the target cell is TCI state index1, which corresponds to the TCI state1 of the target cell. Therefore, the CSI-RS resource set of the target cell can be determined as the CSI-RS resource set1 of the target cell.

[0238] Optionally, the TCI state corresponding to the TCI state index of the target cell in the cell handover signaling involved in this application is the DL TCI state of the target cell or the joint TCI state of the target cell.

[0239] Optionally, in design ②, in one implementation, the first information is a second field, which is used to indicate whether to trigger the measurement and / or reporting of the CSI-RS resources of the target cell after receiving cell handover signaling. For example, the length of the second field can be 1 bit. For instance, when the value of the 1 bit is "1", it indicates that the measurement and / or reporting of the CSI-RS resources of the target cell is triggered; when the value of the 1 bit is "0", it indicates that the measurement and / or reporting of the CSI-RS resources of the target cell is not triggered. Alternatively, when the value of the 1 bit is "0", it indicates that the measurement and / or reporting of the CSI-RS resources of the target cell is triggered; when the value of the 1 bit is "1", it indicates that the measurement and / or reporting of the CSI-RS resources of the target cell is not triggered. Optionally, the length of the second bit can also be 2 bits or 3 bits, etc., and this application does not limit the length of the second field. The CSI-RS resources of the target cell are the CSI-RS resources of the target cell determined by the aforementioned method (1), method (2), or method (3). Optionally, in this implementation, the first information may be carried in the downlink control information of the cell handover signaling, or the first information may be carried in the cell handover signaling.

[0240] Optionally, in another implementation under design ②, the first access network device sends configuration information (hereinafter referred to as the fourth configuration information for ease of distinction) via RRC signaling. This fourth configuration information is used to indicate whether the terminal needs to perform measurement and / or reporting after receiving the cell handover signaling. If the configuration requires measurement and / or reporting, the terminal, after receiving the cell handover signaling, determines the CSI-RS resources of the target cell according to the TCI state corresponding to the TCI state index of the target cell in the cell handover signaling, and the aforementioned method (1), method (2), or method (3). If the configuration does not require measurement and / or reporting, then measurement and / or reporting is not performed. Optionally, in this implementation, the first information can be understood as the fourth configuration information sent via the RRC signaling.

[0241] Optionally, in another implementation under design ②, the first information can also be understood as the TCI state index of the target cell in the cell handover signaling. That is, the TCI state index of the target cell in the cell handover signaling implicitly indicates the measurement and / or reporting of the reference signal resources of the target cell after receiving the cell handover signaling.

[0242] S502, the terminal sends the measurement results of the CSI-RS resources of the target cell to the second access network device. Correspondingly, the second access network device receives the measurement results of the CSI-RS resources of the target cell from the terminal.

[0243] The second access network device is the access network device corresponding to the target cell. The access network device corresponding to the target cell can also be called the access network device where the target cell is located, or the access network device of the target cell, or the target access network device, or the target base station, etc., and is not limited thereto. Optionally, the access network device corresponding to the serving cell and the access network device corresponding to the target cell can be the same access network device, that is, the first access network device and the second access network device can be the same; or, the access network device corresponding to the serving cell and the access network device corresponding to the target cell can be different access network devices, that is, the first access network device and the second access network device are different.

[0244] Optionally, the descriptions of the second access network device and the target cell in this application can be interchanged.

[0245] In some feasible implementations, after the terminal determines the CSI-RS resources or CSI-RS resource set of the target cell, if only reporting is triggered by the first information, the terminal can report the measurement results of the CSI-RS resources of the target cell or the CSI-RS resources in the CSI-RS resource set. If both measurement and reporting are triggered by the first information, the terminal can measure the CSI-RS resources of the target cell or the CSI-RS resources in the CSI-RS resource set to obtain the measurement results of the CSI-RS resources of the target cell, and then send the measurement results of the CSI-RS resources of the target cell to the second access network device. Here, the terminal measuring the CSI-RS resources of the target cell can be understood as the second access network device sending CSI-RS data to the terminal on the CSI-RS resources of the target cell, and correspondingly, the terminal receiving CSI-RS data on the corresponding CSI-RS resources, thus obtaining the measurement results of the CSI-RS resources of the target cell.

[0246] For example, the terminal can send the measurement results of the CSI-RS resources of the target cell to the second access network device before actually handing over to the target cell, or the terminal can send the measurement results of the CSI-RS resources of the target cell to the second access network device after actually handing over to the target cell. Optionally, after the terminal receives the cell handover signaling, there are currently two handover procedures: one is a procedure based on the random access channel (RACH), called RACH-based cell handover, that is, after the terminal receives the cell handover signaling, the terminal initiates the RACH procedure to access the target cell. For details, please refer to protocol TS38.300 18.2.0, which will not be described in detail here; the other is a procedure not based on RACH, called RACH-less cell handover, that is, after the terminal receives the cell handover signaling, it directly accesses the target cell. For details, please refer to protocol TS38.300 18.2.0, which will not be described in detail here.

[0247] For example, when the terminal uses RACH-based cell handover, the terminal can send the measurement results of the CSI-RS resources of the target cell to the second access network device after receiving the cell handover signaling and before actually handing over to the target cell.

[0248] For another example, when the terminal uses RACH-less cell handover, the terminal can send the measurement results of the CSI-RS resources of the target cell to the second access network device after receiving the cell handover signaling and actually handing over to the target cell.

[0249] Optionally, after successfully receiving the cell handover signaling, for example, after sending an acknowledgement (ACK) message confirming successful reception of the cell handover signaling, the terminal may send the measurement results of the CSI-RS resources of the target cell to the second access network device. Optionally, if the terminal needs to execute a RACH procedure after successfully receiving the cell handover signaling, the terminal may send the measurement results of the CSI-RS resources of the target cell to the second access network device after successfully completing the RACH procedure.

[0250] The following describes the feedback resources for the measurement results of the CSI-RS resources of the target cell, or the uplink resources used to carry the measurement results of the CSI-RS resources of the target cell.

[0251] In one possible design (i), the measurement results of the target cell's CSI-RS resources can be carried in the uplink resources scheduled by the uplink grant information carried in the random access response. For example, the uplink grant information can be the information carried in the uplink grant (UL grant) field of the random access response (RAR).

[0252] Optionally, this design (a) is typically applicable to performing RACH-based cell handover. Specifically, when a terminal receives cell handover signaling from a first access network device, and the "Timing Advance Command" in the cell handover signaling is set to "FFF" (i.e., no valid TA value is indicated), and the terminal fails to successfully measure the TA value, then the terminal initiates a RACH procedure to hand over to the target cell. First, the terminal sends a pilot to the second access network device, and the second access network device sends a RAR to the terminal. This RAR contains a UL grant field, which indicates the resources used for uplink transmission. Therefore, the measurement results of the target cell's CSI-RS resources can be carried in the uplink resources scheduled by the RAR UL grant.

[0253] In one possible design (ii), the measurement results of the CSI-RS resources of the target cell can be carried on the uplink channel used for the first uplink transmission after handover to the target cell. This uplink channel can be scheduled by downlink control information or pre-configured. Here, "first uplink transmission after handover to the target cell" can be understood in three ways: 1. The first dynamically scheduled PUSCH after handover to the target cell; 2. A pre-configured PUSCH for the first uplink transmission; 3. The PUSCH for the RAR UL grant in RACH-based cell handover. Alternatively, the uplink channel used for the first uplink transmission after handover to the target cell can be a PUSCH, such as a configured grant (CG) PUSCH, a dynamic scheduling (DG) PUSCH, or a pre-configured PUSCH for the first uplink transmission. Optionally, the uplink channel used for the first uplink transmission after handover to the target cell can also be an uplink channel used to carry the RRC Reconfiguration Complete message.

[0254] In one possible design (iii), the measurement results of the target cell's CSI-RS resources can be carried in the uplink resource information corresponding to the uplink resource information carried in the cell handover signaling. This uplink resource information can be uplink grant (UL grant) information or uplink resource index. That is, a new field can be added to the cell handover signaling to carry UL grant information or uplink resource index. One uplink resource index corresponds to one uplink resource. For example, the uplink resource index can be a physical uplink control channel (PUCCH) ID or a CG PUSCH ID, where one PUCCH ID corresponds to one PUCCH and one CG PUSCH ID corresponds to one CG PUSCH. Optionally, in this design (iii), the beam of the uplink resource scheduled by the cell handover signaling can be determined based on the TCI state in the cell handover signaling.

[0255] In one possible design (iv), the measurement results of the target cell's CSI-RS resources can be carried on pre-configured uplink resources (or pre-configured uplink resources). For example, the pre-configured uplink resources can be PUCCH or CG PUSCH. Optionally, this design (iv) may specifically include the following four implementation methods:

[0256] In the first implementation, the pre-configured uplink resources can be the uplink resources associated with the reporting configuration of the serving cell included in the first information. For example, in this method, the serving cell / first access network device can send configuration information (hereinafter referred to as fifth configuration information for ease of distinction). This fifth configuration information is used to configure the association between the reporting configuration of the serving cell and the pre-configured uplink resources. For example, a reporting configuration of a serving cell is associated with a pre-configured uplink resource. The terminal determines the uplink resources used to send the measurement results of CSI-RS resources based on the reporting configuration corresponding to the reporting configuration index of the serving cell included in the first information and the association between the reporting configuration of the serving cell and the pre-configured uplink resources configured in the fifth configuration information.

[0257] In the second implementation, the pre-configured uplink resources can also be uplink resources associated with the trigger state of the serving cell included in the first information. For example, in this method, the serving cell / first access network device can send configuration information (hereinafter referred to as the sixth configuration information for ease of distinction). This sixth configuration information is used to configure the association between the trigger state of the serving cell and the reporting configuration of the serving cell, as well as the association between the reporting configuration of the serving cell and the pre-configured uplink resources. For example, the trigger state of a serving cell is associated with one or more reporting configurations of the serving cell, and the reporting configuration of a serving cell is associated with a pre-configured uplink resource. The terminal determines the uplink resources used to send the measurement results of the CSI-RS resources based on the trigger state corresponding to the trigger state index of the serving cell included in the first information, the association between the trigger state of the serving cell and the reporting configuration of the serving cell configured in the sixth configuration information, and the association between the reporting configuration of the serving cell and the pre-configured uplink resources. Optionally, the above-mentioned sixth configuration information can also be understood as a combination of the first configuration information and the fifth configuration information.

[0258] In the third implementation, the pre-configured uplink resource can also be the CSI-RS resource of the target cell or the uplink resource associated with the CSI-RS resource set. For example, in this method, the serving cell / first access network device can send configuration information (hereinafter referred to as the seventh configuration information for ease of distinction). This seventh configuration information is used to configure the association between the CSI-RS resource / CSI-RS resource set of the candidate cell and the pre-configured uplink resource. For example, the CSI-RS resource / CSI-RS resource set of a candidate cell is associated with a pre-configured uplink resource. The terminal determines the uplink resource used to send the measurement results of the CSI-RS resource based on the CSI-RS resource index / CSI-RS resource set index of the target cell included in the first information and the association between the CSI-RS resource / CSI-RS resource set of the candidate cell and the pre-configured uplink resource configured in the seventh configuration information.

[0259] In the fourth implementation, the pre-configured uplink resources can also be pre-configured dedicated uplink resources for the first reporting of the target cell's CSI-RS resource measurement results after receiving cell handover signaling; that is, the uplink resources used to feed back the target cell's CSI-RS resource measurement results are pre-configured dedicated resources. For example, in this method, the serving cell / first access network device can send configuration information (hereinafter referred to as the eighth configuration information for ease of distinction), which is used to configure the uplink resources dedicated to the first reporting of the target cell's CSI-RS resource measurement results after receiving cell handover signaling.

[0260] Optionally, under this design (iv), the beam of the uplink resource can be determined based on the TCI state in the cell handover signaling.

[0261] Alternatively, the above designs (ii), (iii) and (iv) are generally applicable to performing RACH-less cell handover.

[0262] Optionally, the measurement results may also be referred to as CSI information or CSI. For example, the measurement results of the CSI-RS resources of the target cell in this application may include one or more of the following: RSRP, SINR, PMI, RI, LI, CQI, or i1. Optionally, the measurement results of the CSI-RS resources of the target cell may also include information such as the CSI-RS resource indicator (CRI) and / or SSB index. Generally, which CSI information the terminal feeds back can be determined by the configuration of the first access network device. For example, if the first information includes the reporting configuration index of the serving cell, then the reporting quantity in the corresponding reporting configuration can be used to determine which CSI information to report. As another example, if the first information includes the trigger status information of the serving cell, then the associated reporting configuration can be determined based on the trigger status information, and then the reporting quantity in the reporting configuration can be used to determine which CSI information to report. For example, if the TCI state is associated with the trigger state or reporting configuration of the serving cell, the trigger state or reporting configuration can be determined based on the TCI state indicated by the cell handover signaling. Then, the CSI information to be reported can be determined based on the reporting configuration associated with the trigger state or the report quantity in that reporting configuration. When the first information does not indirectly or directly indicate which CSI information to report, the first access network device can configure or the protocol can specify which CSI information needs to be reported.

[0263] Optionally, after the second access network device receives the measurement results of the CSI-RS resources of the target cell, the second access network device can select a suitable uplink / downlink data scheduling method for the terminal based on the measurement results of the CSI-RS resources of the target cell. Alternatively, it can be described as using the measurement results of the CSI-RS resources of the target cell for uplink / downlink data scheduling of the target cell. For example, the second access network device can select the number of data transmission streams based on the reported RI. Even more exemplarily, the second access network device can select the modulation order, modulation scheme, coding scheme, etc., of the data transmission based on the reported CQI.

[0264] In the embodiments of this application, during cell handover, the measurement and / or reporting of the reference signal (e.g., CSI-RS) resources of the target cell are triggered by the serving cell, so that the network-side equipment (e.g., the second access network device) can know the measurement results of the reference signal resources of the target cell in advance. Therefore, it is beneficial to improve the reliability and efficiency of data transmission after the cell handover is completed (i.e., after the handover from the serving cell to the target cell).

[0265] Please refer to Figure 6, which is another flowchart illustrating the communication method provided in an embodiment of this application. As shown in Figure 6, the communication method may include the following steps:

[0266] S600: The terminal sends capability information to the first access network device. Correspondingly, the first access network device receives the capability information from the terminal.

[0267] Step S600 is an optional step. For an understanding of step S600, please refer to the description of step S500 in the corresponding embodiment of Figure 5 above. It will not be repeated here.

[0268] S601. The first access network device sends first configuration information to the terminal. Correspondingly, the terminal receives the first configuration information from the first access network device.

[0269] For example, the first configuration information can be carried in RRC signaling. This first configuration information includes one or more reporting configurations for the serving cell, such as LTM-CSI-ReportConfig. The reporting configuration is used to configure relevant parameters for CSI reporting by candidate cells during cell handover. One reporting configuration of the serving cell can be associated with one or more CSI-RS resource sets, which include CSI-RS resources of one or more candidate cells, including the target cell. Specifically, the reporting configuration can be associated with the CSI-RS resources of candidate cells using any one or more of the following methods:

[0270] Method 1: A report configuration is associated with a CSI-RS resource set, which includes the CSI-RS resources of one or more candidate cells. Specifically, Method 1 can include the following two implementation methods:

[0271] Implementation method 1.1: A report configuration is associated with a CSI-RS resource set. This CSI-RS resource set includes one or more candidate cell indexes and one or more CSI-RS resource indexes, and the number of candidate cell indexes is the same as the number of CSI-RS resource indexes. The i-th candidate cell index corresponds to the i-th CSI-RS resource index, where i is a positive integer greater than or equal to 1. In other words, the CSI-RS resource indexes and candidate cell indexes correspond one-to-one. In this application, one CSI-RS resource set index corresponds to one CSI-RS resource set, one candidate cell index corresponds to one candidate cell, and one CSI-RS resource index corresponds to one CSI-RS resource.

[0272] In implementation method 1.2, a report configuration is associated with a CSI-RS resource set. This CSI-RS resource set includes the number of CSI-RS resources corresponding to each candidate cell, one or more candidate cell indices, and one or more CSI-RS resource indices. The i-th candidate cell index corresponds to Ki CSI-RS resource indices, where Ki is the number of CSI-RS resources corresponding to the i-th candidate cell, i is a positive integer greater than or equal to 1, and Ki is a positive integer greater than or equal to 1. Optionally, the CSI-RS set may also include the number of candidate cells, in which case the number of candidate cell indices is equal to the number of candidate cells.

[0273] Understandably, the statement "the CSI-RS resource set includes the number of CSI-RS resources corresponding to each candidate cell" may have the following two scenarios: Scenario 1: The number of CSI-RS resources for each candidate cell is directly configured in the CSI-RS resource set, and the number of CSI-RS resources for different candidate cells is the same as the configured number; that is, the number of CSI-RS resources for each candidate cell is the same. Scenario 2: The number of CSI-RS resources for each candidate cell is configured independently, meaning the resource count for each candidate cell is configured separately. In this case, the number of CSI-RS resources for each candidate cell can be the same or different. For example, a list indicating the number of CSI-RS resources corresponding to each candidate cell can be configured, containing one or more values, each value corresponding to the number of CSI-RS resources for one candidate cell.

[0274] Method 2: A report configuration is associated with a CSI-RS resource set, which includes only the CSI-RS resources of one candidate cell. Method 2 can be understood as a special case of Method 1. Optionally, a CSI-RS resource set including only the CSI-RS resources of one candidate cell can also be described as a CSI-RS resource set including at most one candidate cell's CSI-RS resources.

[0275] Method 3: A report configuration associates one or more CSI-RS resource sets, each CSI-RS resource set including only one or more CSI-RS resources of a candidate cell. Optionally, each CSI-RS resource set including only one or more CSI-RS resources of a candidate cell can also be described as each CSI-RS resource set including at most one or more CSI-RS resources of a candidate cell.

[0276] Optionally, the phrase "report configuration associated with CSI-RS resource set" in this application embodiment can be interpreted in three ways: 1. The report configuration includes an index of the CSI-RS resource set (or a CSI-RS resource set index); 2. The association between the report configuration index (or report configuration index) and the CSI-RS resource set index is indicated by other signaling or additional signaling; 3. The association between the report configuration index and the CSI-RS resource set index is predefined, such as protocol predefined. Alternatively, the association between the report configuration index and the CSI-RS resource index or the CSI-RS resource set index can be configured or pre-configured. Optionally, since one XXX index corresponds to one XXX in this application (i.e., there is a one-to-one correspondence between XXX index and XXX), "XXX index" is sometimes abbreviated as "XXX" in this application. To make the solution provided in this application embodiment clearer, this application can be understood as including a CSI-RS resource set index in the report configuration, that is, the first configuration information configures the association between the report configuration and the CSI-RS resource set.

[0277] For example, taking the report configuration of the serving cell included in the first configuration information as report configuration 1, report configuration 1 can be associated with CSI-RS resource set 1, which can include the CSI-RS resources of candidate cell 1 and the CSI-RS resources of candidate cell 2.

[0278] For example, taking the report configuration of the serving cell included in the first configuration information as report configuration 1, report configuration 1 can be associated with CSI-RS resource set 1, which may include only the CSI-RS resources of candidate cell 1.

[0279] For example, if the report configurations of the serving cell included in the first configuration information are report configuration 1 and report configuration 2, report configuration 1 is associated with CSI-RS resource set 1 and report configuration 2 is associated with CSI-RS resource set 2. Each CSI-RS resource set includes only the CSI-RS resources of one candidate cell. For example, CSI-RS resource set 1 includes the CSI-RS resources of candidate cell 1 and CSI-RS resource set 2 includes the CSI-RS resources of candidate cell 2.

[0280] Optionally, the report configuration may also include a report quantity, which may include one or more of CQI, PMI, CRI, SSB Index, LI, RI, L1-RSRP, L1-SINR, and i1.

[0281] Optionally, the first configuration information may also include trigger status information, or in other words, the first configuration information may also include the association between the trigger status and the report configuration. Optionally, the association between the trigger status and the report configuration may also be carried in other configuration information / messages / signaling, or the association between the trigger status and the report configuration may be predefined, such as that predefined by the protocol, which is not limited in this application.

[0282] Optionally, the report configurations associated with different trigger states may overlap, meaning that different trigger states may be associated with the same report configuration. Optionally, the CSI-RS resource sets associated with different report configurations may also overlap, meaning that different report configurations may be associated with the same CSI-RS resource set.

[0283] S602, the first access network device sends first information to the terminal. Correspondingly, the terminal receives the first information from the first access network device.

[0284] In this application embodiment, the understanding of the first information can be referred to the description in step S501 of the embodiment corresponding to Figure 5 above. The design method of the first information can be referred to the design ① of the first information in step S501 of the embodiment corresponding to Figure 5 above, which will not be repeated here.

[0285] S603. The terminal sends the measurement results of the CSI-RS resources of the target cell to the second access network device. Correspondingly, the second access network device receives the measurement results of the CSI-RS resources of the target cell from the terminal.

[0286] For an understanding of step S603, please refer to the description of step S502 in Figure 5, which will not be repeated here.

[0287] In this embodiment, during cell handover, the measurement and / or reporting of the reference signal (e.g., CSI-RS) resources of the target cell are triggered by the serving cell, allowing network-side equipment (e.g., the second access network device) to obtain the measurement results of the target cell's reference signal resources in advance. This improves the reliability and efficiency of data transmission after cell handover (i.e., after handover from the serving cell to the target cell). Specifically, in this embodiment, the reference signal resources of the target cell can be determined primarily through the candidate cell index indicated in the cell handover signaling, the content included in the first information (i.e., the triggering status information of the serving cell, the report configuration index of the serving cell, the reference signal resource set index of the target cell, or one or more of the reference signal resource index of the target cell), and the association between the report configuration configured in the first configuration information and the reference signal resource set.

[0288] Please refer to Figure 7, which is another flowchart illustrating the communication method provided in this application embodiment. As shown in Figure 7, the communication method may include the following steps:

[0289] S700: The terminal sends capability information to the first access network device. Correspondingly, the first access network device receives the capability information from the terminal.

[0290] Step S700 is an optional step. For an understanding of step S700, please refer to the description of step S500 in the corresponding embodiment of Figure 5 above. It will not be repeated here.

[0291] S701. The first access network device sends first configuration information to the terminal. Correspondingly, the terminal receives the first configuration information from the first access network device.

[0292] For an understanding of step S701 in this embodiment, please refer to the description of step S601 in the embodiment corresponding to Figure 6 above, which will not be repeated here.

[0293] S702, the first access network device sends second configuration information to the terminal. Correspondingly, the terminal receives the second configuration information from the first access network device.

[0294] The second configuration information is used to configure the association between a TCI state (or TCI state index) and a trigger state (or trigger state index) or a report configuration (or report configuration index). In other words, the second configuration information is used to configure the association between one or more TCI states of a candidate cell and the trigger state or report configuration of the serving cell. One or more TCI states (or TCI states of the candidate cell) in this association include the TCI state (or TCI state of the target cell) corresponding to the TCI state index of the target cell indicated in the cell handover signaling. That is, the second configuration information includes the trigger state or report configuration of the serving cell associated with the TCI state of the target cell corresponding to the TCI state index of the target cell indicated in the cell handover signaling. Optionally, the TCI states included in the second configuration information can be one or more TCI states of one or more candidate cells, where the candidate cells include the target cell.

[0295] Optionally, when a TCI state is associated with a trigger state, a TCI state of a candidate cell can be associated with one or more trigger states of the serving cell. Alternatively, a TCI state of a candidate cell can also be associated with only one trigger state of the serving cell. When a TCI state is associated with a report configuration, a TCI state of a candidate cell can be associated with one or more report configurations of the serving cell. Alternatively, a TCI state of a candidate cell can also be associated with only one report configuration of the serving cell.

[0296] For example, the association between the TCI state and the trigger state of the serving cell in the second configuration information can be that the TCI state1 of candidate cell 1 is associated with the trigger state1 of the serving cell, the TCI state2 of candidate cell 1 is associated with the trigger state2 of the serving cell, and the TCI state1 of candidate cell 2 is associated with the trigger state3 of the serving cell.

[0297] For example, the association between the TCI state and the trigger state of the serving cell in the second configuration information can be that the TCI state1 of candidate cell 1 is associated with the trigger state 1 and trigger state 2 of the serving cell, the TCI state2 of candidate cell 1 is associated with the trigger state 3 of the serving cell, and the TCI state1 of candidate cell 2 is associated with the trigger state 4 of the serving cell.

[0298] For example, the relationship between the TCI state and the reporting configuration of the serving cell in the second configuration information can be that the TCI state1 of candidate cell 1 is associated with the reporting configuration 1 of the serving cell, and the TCI state2 of candidate cell 1 is associated with the reporting configuration 2 of the serving cell.

[0299] For example, the association between the TCI state and the reporting configuration of the serving cell in the second configuration information can be that the TCI state1 of candidate cell 1 is associated with the reporting configuration 1 and reporting configuration 2 of the serving cell, the TCI state2 of candidate cell 1 is associated with the reporting configuration 3 and reporting configuration 4 of the serving cell, and the TCI state1 of candidate cell 2 is associated with the reporting configuration 5 and reporting configuration 6 of the serving cell.

[0300] Optionally, the trigger states associated with different TCI states of a candidate cell may overlap, and similarly, the reporting configurations associated with different TCI states of a candidate cell may overlap. In other words, different TCI states of a candidate cell may be associated with the same trigger state / reporting configuration.

[0301] Optionally, the trigger states associated with the TCI states of different candidate cells may overlap, and similarly, the reporting configurations associated with the TCI states of different candidate cells may overlap. In other words, the TCI states of different candidate cells may be associated with the same trigger states / reporting configurations.

[0302] Optionally, the first configuration information and the second configuration information can be sent in the same message / signaling, or the first configuration information and the second configuration information can be sent in different messages / messages respectively, without limitation.

[0303] S703. The first access network device sends first information to the terminal. Correspondingly, the terminal receives the first information from the first access network device.

[0304] In the embodiments of this application, the understanding of the first information can be referred to the description in step S501 of the embodiment corresponding to Figure 5 above. The design method of the first information can be referred to the design ② of the first information in step S501 of the embodiment corresponding to Figure 5 above, as well as the method (2) and method (3) under design ②, which will not be repeated here.

[0305] S704. The terminal sends the measurement results of the CSI-RS resources of the target cell to the second access network device. Correspondingly, the second access network device receives the measurement results of the CSI-RS resources of the target cell from the terminal.

[0306] For an understanding of step S704, please refer to the description of step S502 in Figure 5, which will not be repeated here.

[0307] In this embodiment, during cell handover, the serving cell triggers the measurement and / or reporting of the target cell's reference signal (e.g., CSI-RS) resources. This allows network-side equipment (e.g., a second access network device) to know the measurement results of the target cell's reference signal resources in advance, thus improving the reliability and efficiency of data transmission after cell handover (i.e., after handover from the serving cell to the target cell). Specifically, in this embodiment, the target cell's reference signal resources can be determined primarily by the TCI state index indicated in the cell handover signaling, along with first and second configuration information. That is, the terminal receives cell handover signaling from the serving cell, which includes the target cell's TCI state index. The terminal can then measure and / or report the target cell's reference signal resources based on the target cell's TCI state corresponding to the target cell's TCI state, the second configuration information, and the first configuration information. The target cell's reference signal resources are included in the set of reference signal resources associated with the serving cell's trigger state or the serving cell's reporting configuration corresponding to the target cell's TCI state index.

[0308] Please refer to Figure 8, which is another flowchart illustrating the communication method provided in an embodiment of this application. As shown in Figure 8, the communication method may include the following steps:

[0309] S800: The terminal sends capability information to the first access network device. Correspondingly, the first access network device receives the capability information from the terminal.

[0310] Step S800 is an optional step. For an understanding of step S800, please refer to the description of step S500 in the corresponding embodiment of Figure 5 above. It will not be repeated here.

[0311] S801. The first access network device sends third configuration information to the terminal. Correspondingly, the terminal receives the third configuration information from the first access network device.

[0312] This third configuration information is used to configure the association between one or more TCI states of a candidate cell and the CSI-RS resources or CSI-RS resource set of that candidate cell. Here, the one or more TCI states of the candidate cell in the association include the TCI state corresponding to the TCI state index of the target cell in the cell handover signaling (or the TCI state of the target cell).

[0313] For example, a TCI state of a candidate cell can be associated with one or more CSI-RS resources / CSI-RS resource sets of that candidate cell. Optionally, the CSI-RS resource sets of the same candidate cell associated with different TCI states may overlap.

[0314] Optionally, the association between the TCI state and CSI-RS resources or CSI-RS resource set included in the third configuration information is the association between the TCI state of the same candidate cell and the CSI-RS resources or CSI-RS resource set of that candidate cell. Here, the candidate cell includes the target cell. For example, taking candidate cell 1 as an example, the third configuration information is used to configure the association between one or more TCI states of candidate cell 1 and the CSI-RS resources or CSI-RS resource set of candidate cell 1.

[0315] Optionally, the associations configured in the third configuration information may include the associations between the TCI states of one or more candidate cells and the corresponding CSI-RS resources / CSI-RS resource sets of those candidate cells, where the one or more candidate cells include the target cell. For example, taking two candidate cells, candidate cell 1 and candidate cell 2, as an example, the third configuration information configures the associations between one or more TCI states of candidate cell 1 and the CSI-RS resources or CSI-RS resource sets of candidate cell 1, as well as the associations between one or more TCI states of candidate cell 2 and the CSI-RS resources or CSI-RS resource sets of candidate cell 2.

[0316] For example, the association between the TCI state of a candidate cell and the CSI-RS resource set of that candidate cell in the third configuration information can be as follows: TCI state1 of candidate cell 1 is associated with CSI-RS resource set 1 of candidate cell 1, and TCI state2 of candidate cell 1 is associated with CSI-RS resource set 2 of candidate cell 1.

[0317] For example, the association between the TCI state of a candidate cell and the CSI-RS resource set of that candidate cell in the third configuration information can be as follows: TCI state1 of candidate cell 1 is associated with CSI-RS resource set 1 of candidate cell 1, and TCI state2 of candidate cell 1 is associated with CSI-RS resource set 2 of candidate cell 1; TCI state3 of candidate cell 2 is associated with CSI-RS resource set 3 of candidate cell 2, and TCI state4 of candidate cell 2 is associated with CSI-RS resource set 4 of candidate cell 2.

[0318] S802, the first access network device sends first information to the terminal. Correspondingly, the terminal receives the first information from the first access network device.

[0319] In the embodiments of this application, the understanding of the first information can be referred to the description in step S501 of the embodiment corresponding to Figure 5 above. The design method of the first information can be referred to the design ② of the first information in step S501 of the embodiment corresponding to Figure 5 above, and the method (1) under design ②, which will not be repeated here.

[0320] S803. The terminal sends the measurement results of the CSI-RS resources of the target cell to the second access network device. Correspondingly, the second access network device receives the measurement results of the CSI-RS resources of the target cell from the terminal.

[0321] For an understanding of step S803, please refer to the description of step S502 in Figure 5, which will not be repeated here.

[0322] In this embodiment, during cell handover, the serving cell triggers the measurement and / or reporting of the reference signal (e.g., CSI-RS) resources of the target cell, enabling network-side equipment (e.g., a second access network device) to obtain the measurement results of the target cell's reference signal resources in advance. This improves the reliability and efficiency of data transmission after cell handover (i.e., after handover from the serving cell to the target cell). Specifically, in this embodiment, the reference signal resources of the target cell can be determined primarily by the TCI state index indicated in the cell handover signaling and the third configuration information. That is, the terminal receives cell handover signaling from the serving cell, which includes the TCI state index of the target cell. Based on the TCI state corresponding to the target cell's TCI state index and the association between the TCI state indicated by the third configuration information and the reference signal resource set, the terminal measures and / or reports the measurement results of the target cell's reference signal resources. The reference signal resources of the target cell are the reference signal resources of candidate cells associated with the TCI state corresponding to the TCI state index or the reference signal resources in the associated reference signal resource set.

[0323] Optionally, any of the embodiments shown in Figures 5 to 8 can also be applied to the O-RAN scenario. It should be understood that in the O-RAN scenario, the access network devices (e.g., the first access network device, the second access network device) involved in Figures 5 to 8 can be replaced by CU (e.g., CU-CP or CU-UP) or DU or RU, etc.

[0324] The communication device provided in this application will now be described in detail with reference to Figures 9 to 11.

[0325] It is understood that, in order to achieve the functions in the above embodiments, the communication device includes hardware structures and / or software modules corresponding to each function. Those skilled in the art should readily recognize that, based on the units and method steps described in conjunction with the embodiments disclosed in this application, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed by hardware or by computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.

[0326] Figures 9 to 11 are schematic diagrams illustrating the possible communication devices provided in the embodiments of this application. These communication devices can be used to implement the functions of the terminal or access network device (e.g., base station) in the above method embodiments, and thus also achieve the beneficial effects of the above method embodiments. In the embodiments of this application, the communication device can be one of the terminals 120a-120j shown in Figure 1, or it can be RAN node 110a or 110b shown in Figure 1. Optionally, it can also be a module (e.g., a chip) applied to the terminal or access network device.

[0327] As shown in Figure 9, the communication device 900 includes a processing unit 910 and a transceiver unit 920. The transceiver unit 920 and the processing unit 910 can be software, hardware, or a combination of both. Optionally, the communication device 900 may further include a storage unit 930 for storing device program code and / or data, not shown in Figure 9.

[0328] The transceiver unit 920 can implement sending and / or receiving functions. Optionally, the transceiver unit 920 can also be referred to as a communication unit. The transceiver unit 920 may further include a receiving unit and / or a sending unit, wherein the receiving unit is used to implement the receiving function, and the sending unit is used to implement the sending function. Optionally, the transceiver unit 920 can be used to receive information sent by other devices, and can also be used to send information to other devices.

[0329] The communication device 900 is used to implement the functions of the terminal-side communication device in any of the method embodiments shown in Figures 5 to 8. For example, the terminal-side communication device may be a terminal or a communication module in the terminal, or a circuit or chip in the terminal responsible for communication functions. Alternatively, the communication device 900 is used to implement the functions of the network-side communication device in any of the method embodiments shown in Figures 5 to 8. For example, the network-side communication device may be an access network device, a module (e.g., a circuit, chip, or chip system) in the access network device, or a logic node, logic module, or software that can implement all or part of the functions of the access network device.

[0330] When the communication device 900 is used to implement the function of the terminal in any of the method embodiments shown in Figures 5 to 8:

[0331] The transceiver unit 920 is used to receive first information from the serving cell. The first information is used to trigger the measurement of the reference signal resources of the target cell and / or the reporting of the measurement results after receiving the cell handover signaling. The target cell is the candidate cell corresponding to the candidate cell index in the cell handover signaling.

[0332] The transceiver unit 920 is used to send the measurement results of the reference signal resources of the target cell to the target cell.

[0333] In one possible implementation, the first information includes one or more of the following:

[0334] Information on the triggering status of the serving cell, the report configuration index of the serving cell, the reference signal resource set index of the target cell, or the reference signal resource index of the target cell;

[0335] The triggering state of the serving cell is associated with the reporting configuration of the serving cell. The reference signal resource set associated with the reporting configuration of the serving cell or the reporting configuration index of the serving cell includes the reference signal resources or reference signal resource set of the target cell. The reference signal resource set of the target cell includes the reference signal resources of the target cell.

[0336] In one possible implementation, the processing unit 910 is used for:

[0337] Based on the information of the trigger status of the serving cell included in the first information, the report configuration index of the serving cell, the reference signal resource set index of the target cell, and one or more of the information in the reference signal resource index of the target cell, the reference signal resource of the target cell is determined.

[0338] In one possible implementation, when the triggering state of the serving cell is associated with a reporting configuration of the serving cell, that reporting configuration is at least associated with a reference signaling resource or a set of reference signaling resources of the target cell; or,

[0339] When the trigger state of the serving cell is associated with multiple reporting configurations of the serving cell, at least one of the multiple reporting configurations is associated with the reference signal resources or set of reference signal resources of the target cell.

[0340] In one possible implementation, before receiving the first information from the serving cell, the transceiver unit 920 is further configured to:

[0341] The system receives first configuration information from the serving cell, the first configuration information including one or more reporting configurations of the serving cell, wherein one reporting configuration of the serving cell is associated with one or more sets of reference signal resources, the one or more sets of reference signal resources including reference signal resources of one or more candidate cells, and the one or more candidate cells including the target cell.

[0342] In one possible implementation, before receiving the first information from the serving cell, the transceiver unit 920 is further configured to:

[0343] The system receives second configuration information from the serving cell. The second configuration information is used to configure the association between one or more Transmission Configuration Indication (TCI) states of candidate cells and the trigger state or report configuration of the serving cell. The association between one or more TCI states of candidate cells includes the TCI state of the target cell corresponding to the TCI state index of the target cell indicated in the cell handover signaling.

[0344] In one possible implementation, the transceiver unit 920 is further configured to receive cell handover signaling from the serving cell, the cell handover signaling including a TCI state index of the target cell; the processing unit 910 is further configured to measure the reference signal resources of the target cell based on the TCI state of the target cell corresponding to the TCI state index of the target cell, the second configuration information, and the first configuration information, and / or report the measurement results of the reference signal resources of the target cell, wherein the reference signal resources of the target cell are included in the set of reference signal resources associated with the trigger state of the serving cell or the reporting configuration of the serving cell corresponding to the TCI state index of the target cell.

[0345] In one possible implementation, before receiving the first information from the serving cell, the transceiver unit 920 is further configured to:

[0346] The third configuration information is received from the serving cell. The third configuration information is used to configure the association between one or more TCI states of the candidate cell and the reference signal resources or set of reference signal resources of the candidate cell. The one or more TCI states of the candidate cell in the association include the TCI state of the target cell corresponding to the TCI state index of the target cell in the cell handover signaling.

[0347] In one possible implementation, the transceiver unit 920 is further configured to receive cell handover signaling from the serving cell, the cell handover signaling including a TCI state index of the target cell; the processing unit 910 is further configured to measure the reference signal resources of the target cell based on the TCI state of the target cell corresponding to the TCI state index of the target cell and the third configuration information, and / or report the measurement results of the reference signal resources of the target cell, wherein the reference signal resources of the target cell are the reference signal resources of candidate cells associated with the TCI state of the target cell corresponding to the TCI state index of the target cell or the reference signal resources in the associated set of reference signal resources.

[0348] In one possible implementation, the first information is carried in downlink control information for scheduling the cell handover signaling, or the first information is carried in the cell handover signaling, or the first information is carried in downlink control information for scheduling the first uplink transmission of the target cell.

[0349] In one possible implementation, when the first information is carried in the cell handover signaling, the cell handover signaling further includes a first field, which is used to indicate whether the first information exists in the cell handover signaling.

[0350] In one possible implementation, the measurement results of the reference signal resources of the target cell are carried in any of the following uplink resources:

[0351] Uplink resources scheduled using uplink grant information carried in the random access response;

[0352] The uplink channel used for the first uplink transmission after switching to the target cell is either scheduled by downlink control information or pre-configured.

[0353] The uplink resources carried in the cell handover signaling are uplink resource information corresponding to uplink resource information, which is uplink authorization information or uplink resource index;

[0354] The pre-configured uplink resources are either uplink resources associated with the reporting configuration of the serving cell included in the first information, or uplink resources associated with the triggering state of the serving cell included in the first information, or pre-configured uplink resources dedicated to the measurement results of the reference signal resources of the target cell for the first time after receiving the cell handover signaling.

[0355] In one possible implementation, the transceiver unit 920 is further configured to:

[0356] Send capability information, which instructs the terminal to support the measurement of reference signal resources of candidate cells triggered by the serving cell and / or the reporting of measurement results.

[0357] In one possible design, when the communication device 900 is a terminal or a communication module within a terminal, the functionality of the processing unit 910 can be implemented by one or more processors. Specifically, the processor may include a modem chip, or a system-on-a-chip (SoC) or SIP chip containing a modem core. The functionality of the transceiver unit 920 can be implemented by transceiver circuitry.

[0358] In one possible design, when the communication device 900 is a circuit or chip in a terminal responsible for communication functions, such as a modem chip or a system-on-a-chip (SoC) or SIP chip containing a modem core, the function of the processing unit 910 can be implemented by a circuit system in the aforementioned chip that includes one or more processors or processor cores. The function of the transceiver unit 920 can be implemented by the interface circuitry or data transceiver circuitry on the aforementioned chip.

[0359] When the communication device 900 is used to implement the function of the access network device in any of the method embodiments shown in Figures 5 to 8:

[0360] Processing unit 910 is configured to determine first information, which is used to trigger the measurement and / or reporting of the measurement results of the reference signal resources of the target cell after receiving cell handover signaling, wherein the target cell is the candidate cell corresponding to the candidate cell index in the cell handover signaling;

[0361] The transceiver unit 920 is used to send the first information.

[0362] In one possible implementation, before sending the first information, the transceiver unit 920 is further configured to:

[0363] Send first configuration information, the first configuration information including one or more report configurations of the serving cell, wherein one report configuration of the serving cell is associated with one or more reference signal resource sets, the one or more reference signal resource sets include reference signal resources of one or more candidate cells, and the one or more candidate cells include the target cell.

[0364] In one possible implementation, the transceiver unit 920 is further configured to:

[0365] Send second configuration information, which is used to configure the association between one or more Transmission Configuration Indication (TCI) states of candidate cells and the trigger state or report configuration of the serving cell. The one or more TCI states of candidate cells in the association include the TCI state of the target cell corresponding to the TCI state index of the target cell indicated in the cell handover signaling.

[0366] In one possible implementation, the transceiver unit 920 is further configured to:

[0367] Send third configuration information, which is used to configure the association between one or more TCI states of the candidate cell and the reference signal resources or reference signal resource set of the candidate cell. The one or more TCI states of the candidate cell in the association include the TCI state of the target cell corresponding to the TCI state index of the target cell in the cell handover signaling.

[0368] In one possible implementation, the transceiver unit 920 is further configured to:

[0369] The terminal receives capability information, which instructs the serving cell supported by the terminal to trigger the acquisition, measurement, and / or reporting of channel state information of candidate cells.

[0370] In one possible implementation, the first information includes one or more of the following:

[0371] Information on the triggering status of the serving cell, the report configuration index of the serving cell, the reference signal resource set index of the target cell, or the reference signal resource index of the target cell;

[0372] The triggering state of the serving cell is associated with the reporting configuration of the serving cell. The reference signal resource set associated with the reporting configuration of the serving cell or the reporting configuration index of the serving cell includes the reference signal resources or reference signal resource set of the target cell. The reference signal resource set of the target cell includes the reference signal resources of the target cell.

[0373] In one possible implementation, when the triggering state of the serving cell is associated with a reporting configuration of the serving cell, that reporting configuration is at least associated with a reference signaling resource or a set of reference signaling resources of the target cell; or,

[0374] When the trigger state of the serving cell is associated with multiple reporting configurations of the serving cell, at least one of the multiple reporting configurations is associated with the reference signal resources or set of reference signal resources of the target cell.

[0375] In one possible implementation, the first information is carried in downlink control information for scheduling the cell handover signaling, or the first information is carried in the cell handover signaling, or the first information is carried in downlink control information for scheduling the first uplink transmission of the target cell.

[0376] In one possible implementation, when the first information is carried in the cell handover signaling, the cell handover signaling further includes a first field, which is used to indicate whether the first information exists in the cell handover signaling.

[0377] In one possible implementation, the measurement results of the reference signal resources of the target cell are carried in any of the following uplink resources:

[0378] Uplink resources scheduled using uplink grant information carried in the random access response;

[0379] The uplink channel used for the first uplink transmission after switching to the target cell is either scheduled by downlink control information or pre-configured.

[0380] The uplink resources carried in the cell handover signaling are uplink resource information corresponding to uplink resource information, which is uplink authorization information or uplink resource index;

[0381] The pre-configured uplink resources are either uplink resources associated with the reporting configuration of the serving cell included in the first information, or uplink resources associated with the triggering state of the serving cell included in the first information, or pre-configured uplink resources dedicated to the measurement results of the reference signal resources of the target cell for the first time after receiving the cell handover signaling.

[0382] For a more detailed description of the processing unit 910 and the transceiver unit 920, please refer to the relevant descriptions in any of the method embodiments shown in Figures 5 to 8.

[0383] It is understood that the division of units in the above-described device is merely a logical functional division. Each function can correspond to a functional unit, or two or more functions can be integrated into one functional unit. In actual implementation, all or some units can be integrated into a single physical entity, or they can be distributed across different physical entities. Furthermore, the aforementioned functional units can be implemented in hardware, software, or a combination of both. Whether a function is executed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0384] In one example, the functional unit in any of the above devices may be one or more integrated circuits configured to implement the above methods, such as: one or more ASICs, or one or more central processing units (CPUs), one or more microcontroller units (MCUs), one or more digital signal processors (DSPs), or one or more field programmable gate arrays (FPGAs), or a combination of at least two of these integrated circuit forms.

[0385] In one example, storage unit 930 may include random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory and / or registers, etc.

[0386] As shown in Figure 10, the communication device 1000 includes a processor 1010, and optionally, an interface circuit 1020. The processor 1010 and the interface circuit 1020 are coupled to each other. It is understood that the interface circuit 1020 can be a transceiver or an input / output interface. Optionally, the communication device 1000 may also include a memory 1030 for storing computer programs or instructions executed by the processor 1010, or storing input data required by the processor 1010 to execute instructions, or storing data generated by the processor 1010 after executing computer programs or instructions.

[0387] When the communication device 1000 is used to implement any of the methods shown in Figures 5 to 8, the processor 1010 is used to implement the functions of the processing unit 910, and the interface circuit 1020 is used to implement the functions of the transceiver unit 920.

[0388] When the aforementioned communication device is a chip applied to a terminal, the terminal chip implements the functions of the terminal in the above method embodiments. The terminal chip receives information sent to the terminal by the access network device through other modules (such as an RF module or antenna) in the terminal; or, the terminal chip sends information to other modules (such as an RF module or antenna) in the terminal, which is information sent by the terminal to the access network device.

[0389] When the aforementioned communication device is a module applied to an access network device, the access network device module implements the functions of the access network device in the above method embodiments. The access network device module receives information from other modules (such as radio frequency modules or antennas) in the access network device, which is information sent by the terminal to the access network device; or, the access network device module sends information to other modules (such as radio frequency modules or antennas) in the access network device, which is information sent by the access network device to the terminal. Here, the access network device module can be the baseband chip of the access network device, or a CU, DU, or other module, or a device under an open radio access network (O-RAN) architecture, such as an open CU, open DU, etc.

[0390] As shown in Figure 11, the communication device includes a processor 1110, a memory 1120, and a transceiver 1130. The processor 1110 is mainly used for processing communication protocols and communication data; controlling terminal / access network devices; executing software programs; and processing data from software programs. The memory 1120 can store computer program code, software programs, and data. The transceiver 1130 includes a transmitter 1131, a receiver 1132, radio frequency circuitry (not shown in the figure), and an antenna 1133.

[0391] The processor 1110 can also be called a processing unit, processing board, processing module, or processing device. The transceiver 1130 can also be called a transceiver unit, transceiver, or transceiver device.

[0392] Optionally, the device in transceiver 1130 used to implement the receiving function can be considered as a receiving module, and the device in transceiver 1130 used to implement the transmitting function can be considered as a transmitting module. That is, transceiver 1130 includes a receiver and / or a transmitter. A transceiver may sometimes be called a transceiver unit, a transceiver module, or a transceiver circuit, etc. A receiver may sometimes be called a receiver unit, a receiving module, or a receiving circuit, etc. A transmitter may sometimes be called a transmitter, a transmitting module, or a transmitting circuit, etc.

[0393] Processor 1110 is used to execute terminal-side processing operations in any of the embodiments shown in Figures 5 to 8. Transceiver 1130 is used to execute terminal-side transmission and reception operations in any of the embodiments shown in Figures 5 to 8. Alternatively, processor 1110 is used to execute network-side processing operations in any of the embodiments shown in Figures 5 to 8. Transceiver 1130 is used to execute network-side transmission and reception operations in any of the embodiments shown in Figures 5 to 8.

[0394] When the communication device 1100 is a chip, the chip includes a processor and a transceiver. The transceiver can be an input / output circuit or a communication interface. The processor can be a processing module integrated on the chip, a microprocessor, or an integrated circuit. In the above method embodiments, the terminal's transmitting operation can be understood as the chip's output, and the terminal's receiving operation can be understood as the chip's input. Similarly, in the above method embodiments, the access network device's transmitting operation can be understood as the chip's output, and the access network device's receiving operation can be understood as the chip's input.

[0395] This application also provides a computer-readable storage medium storing a computer program or instructions for implementing the methods executed by a terminal or access network device in the above-described method embodiments.

[0396] For example, when the computer program is executed by a computer, it enables the computer to implement the method performed by the terminal or access network device in the above method embodiments.

[0397] This application also provides a computer program product containing a program or instructions, which, when executed by a computer, causes the computer to implement the method executed by the terminal or access network device in the above method embodiments.

[0398] This application also provides a communication system, which includes the terminal and the access network device described in the above embodiments. The terminal is used to perform some or all of the operations performed by the terminal in the above method embodiments, and the access network device is used to perform some or all of the operations performed by the access network device in the above method embodiments.

[0399] This application also provides a chip device, including a processor, for calling a computer program or computer instructions stored in the memory, so that the processor executes the method provided in any of the embodiments shown in Figures 5 to 8 above.

[0400] In one possible implementation, the input of the chip device corresponds to the receiving operation in any one of the embodiments shown in Figures 5 to 8, and the output of the chip device corresponds to the sending operation in any one of the embodiments shown in Figures 5 to 8.

[0401] Optionally, the processor is coupled to the memory via an interface.

[0402] Optionally, the chip device further includes a memory storing computer programs or computer instructions.

[0403] It is understood that the processor in the embodiments of this application can be a CPU, or other general-purpose processors, DSPs, ASICs, FPGAs, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. A general-purpose processor can be a microprocessor or any conventional processor.

[0404] The method steps in the embodiments of this application can be implemented in hardware or in software instructions executable by a processor. The software instructions can consist of corresponding software modules, which can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disks, portable hard disks, CD-ROMs, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. The storage medium can also be a component of the processor. The processor and storage medium can reside in an ASIC. Alternatively, the ASIC can reside in an access network device or terminal. The processor and storage medium can also exist as discrete components in the access network device or terminal.

[0405] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of this application are performed entirely or partially. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user equipment, or other programmable device. The computer program or instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions can be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; it can also be an optical medium, such as a digital video optical disc; or it can be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include both types of storage media.

[0406] In the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of different embodiments are consistent and can be referenced by each other. The technical features of different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0407] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application. The order of the process numbers described above does not imply the order of execution; the execution order of each process should be determined by its function and internal logic.

Claims

1. A communication method, characterized in that, include: Receive first information from the serving cell, the first information being used to trigger the measurement and / or reporting of the measurement results of the reference signal resources of the target cell after receiving the cell handover signaling, wherein the target cell is the candidate cell corresponding to the candidate cell index in the cell handover signaling; The measurement results of the reference signal resources of the target cell are sent to the target cell.

2. The method according to claim 1, characterized in that, The first information includes one or more of the following: Information on the triggering status of the serving cell, the report configuration index of the serving cell, the reference signal resource set index of the target cell, or the reference signal resource index of the target cell; The triggering state of the serving cell is associated with the reporting configuration of the serving cell. The reference signal resource set associated with the reporting configuration of the serving cell or the reporting configuration index of the serving cell includes the reference signal resources or reference signal resource set of the target cell. The reference signal resource set of the target cell includes the reference signal resources of the target cell.

3. The method according to claim 2, characterized in that, The method further includes: Based on the information of the trigger status of the serving cell included in the first information, the report configuration index of the serving cell, the reference signal resource set index of the target cell, and one or more of the information in the reference signal resource index of the target cell, the reference signal resource of the target cell is determined.

4. The method according to claim 2 or 3, characterized in that, When the trigger state of the serving cell is associated with a report configuration of the serving cell, the report configuration is associated with at least the reference signal resources or a set of reference signal resources of the target cell; or, When the trigger state of the serving cell is associated with multiple reporting configurations of the serving cell, at least one of the multiple reporting configurations is associated with the reference signal resources or set of reference signal resources of the target cell.

5. The method according to any one of claims 1-4, characterized in that, Before receiving the first information from the serving cell, the method further includes: The system receives first configuration information from the serving cell, the first configuration information including one or more reporting configurations of the serving cell, wherein one reporting configuration of the serving cell is associated with one or more sets of reference signal resources, the one or more sets of reference signal resources including reference signal resources of one or more candidate cells, and the one or more candidate cells including the target cell.

6. The method according to claim 5, characterized in that, Before receiving the first information from the serving cell, the method further includes: The system receives second configuration information from the serving cell. The second configuration information is used to configure the association between one or more Transmission Configuration Indication (TCI) states of candidate cells and the trigger state or report configuration of the serving cell. The association between one or more TCI states of candidate cells includes the TCI state of the target cell corresponding to the TCI state index of the target cell indicated in the cell handover signaling.

7. The method according to claim 6, characterized in that, The method further includes: Receive cell handover signaling from the serving cell, wherein the cell handover signaling includes the TCI state index of the target cell; Based on the TCI state of the target cell corresponding to the TCI state index of the target cell, the second configuration information and the first configuration information measure the reference signal resources of the target cell and / or report the measurement results of the reference signal resources of the target cell, wherein the reference signal resources of the target cell are included in the set of reference signal resources associated with the trigger state of the serving cell or the reporting configuration of the serving cell corresponding to the TCI state index of the target cell.

8. The method according to claim 1, characterized in that, Before receiving the first information from the serving cell, the method further includes: The third configuration information is received from the serving cell. The third configuration information is used to configure the association between one or more TCI states of the candidate cell and the reference signal resources or reference signal resource set of the candidate cell. The one or more TCI states of the candidate cell in the association include the TCI state of the target cell corresponding to the TCI state index of the target cell in the cell handover signaling.

9. The method according to claim 8, characterized in that, The method further includes: Receive cell handover signaling from the serving cell, wherein the cell handover signaling includes the TCI state index of the target cell; Based on the TCI state of the target cell corresponding to the TCI state index of the target cell, and the third configuration information, the reference signal resources of the target cell are measured and / or the measurement results of the reference signal resources of the target cell are reported. The reference signal resources of the target cell are the reference signal resources of the candidate cells associated with the TCI state of the target cell corresponding to the TCI state index of the target cell, or the reference signal resources in the associated reference signal resource set.

10. The method according to any one of claims 1-9, characterized in that, The first information is carried in the downlink control information of the cell handover signaling, or the first information is carried in the cell handover signaling, or the first information is carried in the downlink control information of the first uplink transmission of the target cell.

11. The method according to claim 10, characterized in that, When the first information is carried in the cell handover signaling, the cell handover signaling further includes a first field, which is used to indicate whether the first information exists in the cell handover signaling.

12. The method according to any one of claims 1-11, characterized in that, The measurement results of the reference signal resources of the target cell are carried in any of the following uplink resources: Uplink resources scheduled using uplink grant information carried in the random access response; The uplink channel used for the first uplink transmission after switching to the target cell is either scheduled by downlink control information or pre-configured. The uplink resources carried in the cell handover signaling are uplink resource information corresponding to uplink resource information, which is uplink authorization information or uplink resource index; The pre-configured uplink resources are either uplink resources associated with the reporting configuration of the serving cell included in the first information, or uplink resources associated with the triggering state of the serving cell included in the first information, or pre-configured uplink resources dedicated to the measurement results of the reference signal resources of the target cell for the first time after receiving the cell handover signaling.

13. The method according to any one of claims 1-12, characterized in that, The method further includes: Send capability information, which instructs the terminal to support the measurement of reference signal resources of candidate cells triggered by the serving cell and / or the reporting of measurement results.

14. A communication method, characterized in that, include: First information is determined, which is used to trigger the measurement of reference signal resources of the target cell and / or the reporting of measurement results after receiving cell handover signaling, wherein the target cell is the candidate cell corresponding to the candidate cell index in the cell handover signaling; Send the first message.

15. The method according to claim 14, characterized in that, Before sending the first information, the method further includes: Send first configuration information, the first configuration information including one or more report configurations of the serving cell, wherein one report configuration of the serving cell is associated with one or more reference signal resource sets, the one or more reference signal resource sets include reference signal resources of one or more candidate cells, and the one or more candidate cells include the target cell.

16. The method according to claim 15, characterized in that, The method further includes: Send second configuration information, which is used to configure the association between the TCI state of the candidate cell and the trigger state or the report configuration of the serving cell. The TCI state of the candidate cell in the association includes the TCI state of the target cell corresponding to the TCI state index of the target cell indicated in the cell handover signaling.

17. The method according to claim 14, characterized in that, The method further includes: Send third configuration information, which is used to configure the association between one or more TCI states of the candidate cell and the reference signal resources or reference signal resource set of the candidate cell. The one or more TCI states of the candidate cell in the association include the TCI state of the target cell corresponding to the TCI state index of the target cell in the cell handover signaling.

18. The method according to any one of claims 14-17, characterized in that, The method further includes: The terminal receives capability information, which instructs the serving cell supported by the terminal to trigger the acquisition, measurement, and / or reporting of channel state information of candidate cells.

19. A communication device, characterized in that, It includes units or modules for implementing the method as described in any one of claims 1-13, or includes units or modules for implementing the method as described in any one of claims 14-18.

20. A communication device, characterized in that, Includes a processor for executing computer programs or instructions to cause the communication device to implement the method as described in any one of claims 1-13, or to cause the communication device to implement the method as described in any one of claims 14-18.

21. A communication device, characterized in that, The device includes a processor and a transceiver, the transceiver being used to send and receive information, and the processor being used to execute a computer program or instructions to cause the communication device to implement the method as described in any one of claims 1-13, or to cause the communication device to implement the method as described in any one of claims 14-18.

22. A communication device, characterized in that, The device includes a processor and an interface circuit. The interface circuit is used to receive signals from other communication devices besides the communication device and transmit them to the processor, or to send signals from the processor to other communication devices besides the communication device. The processor is used to execute computer programs or instructions to cause the communication device to implement the method as described in any one of claims 1-13, or to cause the communication device to implement the method as described in any one of claims 14-18.

23. A computer-readable storage medium, characterized in that, The storage medium stores a computer program or instructions that, when executed by a communication device, implement the method as described in any one of claims 1-13, or implement the method as described in any one of claims 14-18.

24. A computer program product, characterized in that, It includes a computer program or instructions that, when executed on a computer, implement the method of any one of claims 1-13, or implement the method of any one of claims 14-18.

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