Communication method, communication apparatus, and computer-readable storage medium

Abstract

Provided are a communication method, a communication apparatus, and a computer-readable storage medium. The method comprises: receiving an LTM cell handover command; in response to the LTM cell handover command, handing over from an original cell to a target cell; and sending a CSI report in the target cell, wherein the CSI report is obtained by performing CSI measurement on the target cell. The CSI measurement starts before receiving the LTM cell handover command, or the CSI measurement is performed after receiving the LTM cell handover command.

Description

Communication methods, communication devices and computer-readable storage media

[0001] This application claims priority to Chinese patent application No. 202510104086.0, filed on January 22, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of communication technology, and in particular to a communication method, communication device and computer-readable storage medium. Background Technology

[0003] To reduce cell handover latency, 3GPP Release 18 (Rel-18) introduced Layer 1 / Layer 2 Triggered Mobility (LTM) cell handover. Typically, in LTM, the network device configures one or more candidate cells for the terminal device to be measured. The terminal device measures the Synchronization Signal Block (SSB) or Channel State Information Reference Signal (CSI-RS) of each candidate cell. Then, the terminal device reports several candidate cells with better measurement results to the network device. Further, the network device sends a cell handover command to the terminal device, which includes indication information of the target cell. Upon receiving the cell handover command, the terminal device switches to the target cell indicated by the command. Summary of the Invention

[0004] Firstly, a communication method is provided. The method includes: receiving an LTM cell handover command; in response to the LTM cell handover command, handing over from an existing cell to a target cell; and sending a CSI report in the target cell. The CSI report is obtained by performing CSI measurements on the target cell. The CSI measurement begins before receiving the LTM cell handover command, or the CSI measurement is performed after receiving the LTM cell handover command.

[0005] Secondly, a communication method is provided. The method includes: sending an LTM cell handover command, which triggers a handover from the original cell to a target cell; and receiving a CSI report from the target cell. The CSI report is obtained by performing CSI measurements on the target cell. The CSI measurement begins before sending the LTM cell handover command, or the CSI measurement is performed after sending the LTM cell handover command.

[0006] Thirdly, a communication apparatus is also provided. The apparatus includes a receiving module, a processing module, and a transmitting module. The receiving module is used to receive an LTM cell handover command. The processing module is used to hand over from the original cell to the target cell in response to the LTM cell handover command. The transmitting module is used to transmit a CSI report in the target cell. The CSI report is obtained based on CSI measurements of the first CSI-RS resource of the Channel State Information Reference Signal of the target cell. The CSI measurement begins before receiving the LTM cell handover command, or the CSI measurement is performed after receiving the LTM cell handover command.

[0007] Fourthly, a communication device is also provided. The device includes a transmitting module and a receiving module. The transmitting module is used to transmit an LTM cell handover command, which triggers a handover from the original cell to the target cell. The receiving module is used to receive a CSI report from the target cell. The CSI report is obtained by performing CSI measurements on the target cell. The CSI measurement begins before the LTM cell handover command is transmitted, or the CSI measurement is performed after the LTM cell handover command is transmitted.

[0008] Fifthly, a computer-readable storage medium is also provided, on which a computer program is stored. When the computer program is executed by a processor, the communication method provided in the first or second aspect is performed.

[0009] In a sixth aspect, a communication device is also provided. The communication device includes a memory and a processor, the memory storing a computer program executable on the processor. When the processor executes the computer program, it performs the communication method provided in the first aspect.

[0010] In a seventh aspect, a communication device is also provided. The communication device includes a memory and a processor, the memory storing a computer program executable on the processor. When the processor executes the computer program, it performs the communication method provided in the second aspect.

[0011] Eighthly, a chip (or communication device) is provided. The chip stores a computer program, which, when executed by the chip, causes the method provided in the first or second aspect to be performed.

[0012] Ninthly, a chip module is provided. The chip module stores a computer program, which, when executed by the chip module, causes the method provided in the first or second aspect to be executed.

[0013] In a tenth aspect, a computer program product is provided. The computer program product includes a computer program that, when run on a computer, causes the computer to perform the method provided in the first or second aspect.

[0014] Eleventhly, a communication system is provided. The communication system includes means for performing the method provided in the first aspect and means for performing the method provided in the second aspect.

[0015] In a twelfth aspect, a chip is provided. The chip includes at least one processor for executing program instructions to perform the methods provided in the first or second aspect.

[0016] In a thirteenth aspect, a chip is provided. The chip includes at least one processor and an interface circuit, the interface circuit being connected to the at least one processor, the processor being configured to execute program instructions to perform the method provided in the first or second aspect. Attached Figure Description

[0017] Figure 1 is a schematic diagram of signaling interaction during LTM cell handover;

[0018] Figure 2 is a signaling interaction diagram of a communication method according to some embodiments;

[0019] Figure 3 is a timing diagram according to some embodiments;

[0020] Figure 4 is a schematic diagram of signaling interaction of another communication method according to some embodiments;

[0021] Figure 5 is a signaling interaction diagram of another communication method according to some embodiments;

[0022] Figure 6 is a signaling interaction diagram of another communication method according to some embodiments;

[0023] Figure 7 is another timing diagram according to some embodiments;

[0024] Figure 8 is another timing diagram according to some embodiments;

[0025] Figure 9 is another timing diagram according to some embodiments;

[0026] Figure 10 is a signaling interaction diagram of another communication method according to some embodiments;

[0027] Figure 11 is a flowchart of a communication method according to some embodiments;

[0028] Figure 12 is a block diagram of a communication device according to some embodiments;

[0029] Figure 13 is a block diagram of another communication device according to some embodiments;

[0030] Figure 14 is a schematic diagram of the hardware architecture of a communication device according to some embodiments. Detailed Implementation

[0031] The communication systems applicable to the embodiments of this disclosure include, but are not limited to, Long Term Evolution (LTE) systems, 5th-generation (5G) systems (such as New Radio (NR) systems), and future evolution systems or multiple converged communication systems. The 5G system can be a non-standalone (NSA) 5G system or a standalone (SA) 5G system. The solutions of the embodiments of this disclosure can also be applied to future new communication systems, such as 6th-generation (6G) communication systems, 7th-generation (7G) communication systems, etc.

[0032] The embodiments disclosed herein mainly relate to communication between terminal devices (or simply terminals) and network devices.

[0033] In this disclosure, "terminal equipment" can refer to various forms of user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), remote station, remote terminal, mobile device, user terminal, terminal equipment, wireless communication equipment, user agent, or user device. A terminal can also be a cellular phone, cordless phone, Session Initiation Protocol (SIP) phone, Wireless Local Loop (WLL) station, Personal Digital Assistant (PDA), handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, in-vehicle device, wearable device, a terminal in a future 5G network, or a terminal in a future evolved Public Land Mobile Network (PLMN), etc., and this disclosure is not limited thereto. In some embodiments of this disclosure, the terminal equipment can be an electronic device with wireless data transmission capabilities. In other embodiments of this disclosure, the terminal equipment can also be a device with transceiver capabilities, such as a chip system. A chip system can include chips and other discrete components.

[0034] The network device in this disclosure embodiment can also be referred to as an access network device, for example, a base station (BS) (also referred to as a base station device). A network device is an apparatus deployed in a radio access network (RAN) to provide wireless communication functions. For example, in a 2nd-generation (2G) network, the device providing base station functions includes a base transceiver station (BTS); in a 3G network, the device providing base station functions includes a node B; in a 4G network, the device providing base station functions includes an evolved node B (eNB); in wireless local area networks (WLANs), the device providing base station functions is an access point (AP); in NR, the device providing base station functions is a next-generation node base station (gNB) and a further evolved node B (ng-eNB). The gNB and the terminal communicate using NR technology, while the ng-eNB and the terminal communicate using Evolved Universal Terrestrial Radio Access (E-UTRA) technology. Both the gNB and ng-eNB can connect to the 5G core network. The network device in this disclosure also includes equipment that provides base station functionality in future new communication systems. In some embodiments, the network device may also be a means of providing wireless communication functionality for terminal devices, such as a chip system. For example, the chip system may include a chip and other discrete components.

[0035] In Rel-18, network devices configure candidate cells to be measured, and terminal devices perform beam measurements on the SSBs transmitted on these candidate cells. Further, the terminal devices report several candidate cells with superior measurement results and their beams, enabling the network devices to determine the target cell and target beam. The network devices then instruct the terminal devices to specify the target cell and target beam via LTM cell handover commands.

[0036] To enable precise beam alignment between terminal and network devices, 3GPP Release 19 (Rel-19) introduced LTM measurements based on Channel State Information Reference Signal (CSI-RS). The terminal device performs beam measurements on the CSI-RS transmitted by the network device on candidate cells and reports the measurement results so that the network device can determine the target cell and target beam.

[0037] Referring to Figure 1, which is a schematic diagram of signaling interaction for an LTM cell handover method, the LTM cell handover process is described below with reference to Figure 1. The LTM cell handover method shown in Figure 1 may include steps S11 to S19. In this disclosure, S in the step numbers represents a step.

[0038] In S11, the terminal device sends a measurement report to the network device.

[0039] The terminal device sends a measurement report (e.g., a Layer 3 measurement report) to the network device so that the network device can determine whether the terminal device needs to perform an LTM cell handover based on the measurement report and prepare for the terminal device to start LTM.

[0040] In S12, the network device determines the LTM candidate configuration.

[0041] LTM candidate configuration may include identifiers for one or more candidate cells and pre-configuration information for each candidate cell. The pre-configuration information may include cell parameters. In other words, the pre-configuration information for candidate cells may be standard configurations used by the terminal device to determine candidate cells, such as measurement configuration, resource configuration, mobility configuration, and synchronization configuration.

[0042] In S13, the network device sends Radio Resource Control (RRC) reconfiguration information to the terminal device.

[0043] The RRC reconfiguration information here may include LTM candidate configuration, which is used to configure candidate cells and their pre-configuration information.

[0044] In S14, the terminal device sends an RRC reconfiguration completion message to the network device.

[0045] The terminal device saves the LTM candidate configuration and sends an RRC reconfiguration completion message to the network device.

[0046] In S15, the terminal device performs uplink and downlink synchronization with the candidate cell.

[0047] It should be noted that the "uplink synchronization and downlink synchronization" in S15 refers to early synchronization. That is, before receiving the LTM cell handover command, the terminal device performs uplink and downlink synchronization with the candidate cell.

[0048] In S16, the terminal device sends a Layer 1 measurement report to the network device.

[0049] The terminal device sends a Layer 1 measurement report to the network device on the serving cell. The Layer 1 measurement report includes measurement results of one or more candidate cells.

[0050] For example, network devices can schedule Layer 1 measurement reports reported by terminal devices. Alternatively, a terminal device can report a Layer 1 measurement report when it detects a predefined event. In other words, a Layer 1 measurement report can be an event-triggered report.

[0051] In S17, the network device sends an LTM cell handover command to the terminal device.

[0052] LTM cell handover commands can include information indicating the target cell, and the terminal device can determine the target cell after receiving the LTM cell handover command. For example, an LTM cell handover command can be a Medium Access Control-Control Element (MAC CE) command.

[0053] In the scheme disclosed herein, the LTM cell handover command is used to trigger a terminal device to hand over from its original cell to a target cell. For example, the LTM cell handover command can indicate the terminal device through the Radio Network Temporary Identifier (RNTI) used by the channel resource carrying the command, so that the terminal device knows that it needs to perform a cell handover based on the command.

[0054] After receiving an LTM cell handover command, the terminal device can send an acknowledgment message for the LTM cell handover command to the network device. Correspondingly, the network device receives the acknowledgment message for the LTM cell handover command. The acknowledgment message for the LTM cell handover command can be an acknowledgment (ACK) of the Hybrid Automatic Repeat reQuest (HARQ) request of the first MAC CE command.

[0055] In S18, the terminal device performs a random access procedure on the target cell.

[0056] After receiving an LTM cell handover command, the terminal device can initiate random access on the target cell.

[0057] In S19, the terminal device completes LTM cell handover.

[0058] After the terminal device completes random access in the target cell, it completes LTM cell handover.

[0059] During LTM cell handover, after the terminal device hands over to the target cell, the network device may not yet have obtained the channel conditions of the target cell, potentially leading to poor communication quality between the terminal device and the network device. For example, after the terminal device hands over to the target cell, because the network device has not yet obtained the channel state information of the target cell, the configuration used for communication between the terminal device and the network device may have a poor match with the channel conditions of the target cell, thus affecting the communication quality between the network device and the terminal device.

[0060] In view of this, in the scheme of this embodiment, the terminal device begins to perform CSI measurement on the target cell before or after receiving the LTM cell handover command to obtain the CSI report of the target cell. Then, after handover from the original cell to the target cell, the terminal device sends the CSI report of the target cell to the network device in the target cell. Therefore, after the terminal device completes the cell handover, the network device can quickly obtain the channel conditions of the target cell, so as to configure and schedule the terminal device according to the channel conditions of the target cell, thereby helping to ensure the communication quality of the terminal device in the target cell after the cell handover.

[0061] First, some terms used in the embodiments of this disclosure will be introduced to facilitate understanding by those skilled in the art.

[0062] 1. Original residential area and target residential area

[0063] The original cell refers to the cell that provided service to the terminal device before the cell handover, and the target cell refers to the cell that will provide service to the terminal device after the cell handover. Before the cell handover, the target cell is a candidate cell.

[0064] For example, before a cell handover, cell 1 provides service to the terminal device; cell 1 is the original cell, and cells 2 and 3 are candidate cells. In the LTM cell handover command, the network device indicates that cell 2 is the target cell. After receiving the LTM cell handover command, the terminal device performs a cell handover, switching from cell 1 to cell 2, thus making cell 2 the target cell.

[0065] In this article, "original cell" can also be replaced with "first cell", and "target cell" can also be replaced with "second cell".

[0066] 2. Time unit and time sub-unit

[0067] In this article, "time unit" and "time subunit" refer to two different granularities of time. The granularity of a time unit is larger than that of a time subunit. In other words, the duration of a time unit is longer than the duration of a time subunit. For example, a time unit may consist of multiple time subunits.

[0068] For example, in this document, "time unit" can be a frame, subframe, slot, etc., and "time subunit" can be a symbol, but this disclosure is not limited thereto.

[0069] 3. CSI-RS Resources

[0070] CSI-RS resources refer to the time-frequency resources used for transmitting CSI-RS. For terminal devices, CSI-RS resources are the time-frequency resources used for receiving CSI-RS, and the terminal devices receive CSI-RS on these time-frequency resources. For network devices, CSI-RS resources are the time-frequency resources used for transmitting CSI-RS, and the network devices transmit CSI-RS on these time-frequency resources. CSI-RS resources can be periodic resources, semi-persistent resources, or aperiodic resources.

[0071] CSI-RS resources can be used for beam measurement or channel state information (CSI) measurement. For clarity, the "first CSI-RS resource" in this paper is used for CSI measurement, and the "second CSI-RS resource" is used for beam measurement. The first CSI-RS resource can be a periodic resource, a semi-persistent resource, or an aperiodic resource.

[0072] In the scheme disclosed herein, the network device can send resource configuration information to the terminal device, and the resource configuration information can be used to configure the first CSI-RS resource. Correspondingly, the terminal device receives the resource configuration information. In some embodiments, the resource configuration information can be carried in Radio Resource Control (RRC) signaling.

[0073] In some embodiments, the first CSI-RS resource is a semi-persistent resource. After sending the resource configuration information, the network device can also send a resource activation command to the terminal device, which is used to activate the first CSI-RS resource. Correspondingly, the terminal device receives the resource activation command. For example, the resource activation command can be a second MAC CE command.

[0074] Furthermore, the first CSI-RS resource is a semi-persistent resource. After receiving the resource activation command, the terminal device can send an acknowledgment message for the resource activation command to the network device. Correspondingly, the network device receives the acknowledgment message for the resource activation command. The acknowledgment message for the resource activation command can be an acknowledgment (ACK) of the Hybrid Automatic Repeat reQuest (HARQ) of the second MAC CE command.

[0075] In other embodiments, the first CSI-RS resource is an aperiodic resource. After sending the resource configuration information, the network device can also send a resource trigger command to the terminal device, which is used to trigger the first CSI-RS resource. The resource trigger command can be carried in downlink control information (DCI).

[0076] In the scheme disclosed herein, the CSI report of the target cell is associated with a first CSI-RS resource. In other words, the first CSI-RS resource is used for CSI measurements of the target cell to obtain the CSI report of the target cell.

[0077] In the scheme disclosed herein, the network device transmits CSI-RS on the first CSI-RS resource, the terminal device receives CSI-RS on the first CSI-RS resource, the terminal device measures the received CSI-RS to obtain the CSI measurement result, and thus obtains the CSI report of the target cell.

[0078] In some embodiments, the network device sends report configuration information to the terminal device. This report configuration information is used to configure CSI reports. The report configuration information may include the type of CSI report and resource indication information, whereby the resource indication information indicates the first CSI-RS resource associated with the CSI report. For example, the report configuration information may be carried in RRC signaling.

[0079] 4. Start time unit and end time unit of CSI measurement

[0080] The start time unit of CSI measurement refers to the time unit at which the terminal device begins CSI measurement. That is, the start time unit of CSI measurement is the first time unit in the time units used for CSI measurement. "Start time unit of CSI measurement" can be replaced with "start time unit of the first CSI-RS resource".

[0081] For example, the terminal device performs CSI measurement at the start time unit of CSI measurement, but does not perform CSI measurement in the time unit preceding the start time unit of CSI measurement, or the terminal device does not perform CSI measurement on the first CSI-RS resource preceding the start time unit of CSI measurement.

[0082] The end time unit of CSI measurement refers to the time unit in which the terminal device ends the CSI measurement. That is, the end time unit of CSI measurement is the last time unit in the time units used for CSI measurement. For example, the terminal device performs CSI measurement in the end time unit of CSI measurement, but does not perform CSI measurement in the next time unit after the end time unit of CSI measurement, or the terminal device does not perform CSI measurement on the next first CSI-RS resource after the end time unit of CSI measurement. "End time unit of CSI measurement" can be replaced with "End time unit of the first CSI-RS resource".

[0083] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. In the following embodiments, the actions performed by the network device can be executed by the network device itself, or by devices within the network device (e.g., processors, chips, chip modules), and the actions performed by the terminal device can be executed by the terminal device itself, or by devices within the terminal device (e.g., processors, chip modules, chips). This disclosure does not impose any limitations on these actions. For ease of description, embodiments provided in this disclosure will be illustrated using network devices and terminal devices as examples, where the executing entities are respectively network devices and terminal devices.

[0084] In some embodiments, the terminal device performs CSI measurements on the target cell before receiving the LTM cell handover command. In other words, the start time unit of the CSI measurement is located before the time unit used to transmit the LTM cell handover command.

[0085] In this document, for a terminal device, the time unit used to transmit the LTM cell handover command is the same as the time unit used to receive the LTM cell handover command. For a network device, the time unit used to transmit the LTM cell handover command is the same as the time unit used to send the LTM cell handover command. In some embodiments of this disclosure, CSI measurement begins before the terminal device receives the LTM cell handover command.

[0086] It should be noted that some embodiments of this disclosure do not limit the order of the "end time unit of CSI measurement and the time unit for receiving LTM cell handover command". The end time unit of CSI measurement may be after the time unit for transmitting LTM cell handover command, or the end time unit of CSI measurement may be before the time unit for transmitting LTM cell handover command.

[0087] Referring to Figure 2, which is a signaling interaction diagram of a communication method according to some embodiments, the communication method shown in Figure 2 may include S21, S22, S23, S24, and S25.

[0088] In S21, the network device sends first information to the terminal device. This first information instructs the reporting of a CSI report for the target cell. Correspondingly, the terminal device receives the first information.

[0089] In S22, the terminal device performs CSI measurements on the target cell to obtain a CSI report.

[0090] After receiving the first information, the terminal device begins CSI measurement.

[0091] In S23, the network device sends an LTM cell handover command to the terminal device. Correspondingly, the terminal device receives the LTM cell handover command.

[0092] In some embodiments, an LTM cell handover command may include information indicating a target cell. For example, an LTM cell handover command may include an identifier of the target cell.

[0093] In some embodiments, the LTM cell handover command may further include: the Transmission Configuration Indication (TCI) status of the target cell. After handover to the target cell, the terminal device can use the TCI status carried in the LTM cell handover command to communicate with the network device. The LTM cell handover command may include one or more TCI states.

[0094] In some embodiments, the LTM cell handover command may further include parameters for achieving uplink synchronization in the target cell. The parameters for achieving uplink synchronization in the target cell may include at least one of the following: the timing advance (TA) of the target cell, the preamble of the target cell, and the identifier of the SSB of the target cell.

[0095] In some embodiments, after receiving an LTM cell handover command, the terminal device may send confirmation information for the LTM cell handover command to the network device. For example, the terminal device may send the confirmation information for the LTM cell handover command to either the original cell or the target cell.

[0096] In S24, in response to the LTM handover command, the terminal device switches from the original cell to the target cell.

[0097] When a terminal device receives an LTM handover command, it performs a cell handover to switch from the original cell to the target cell. For example, after receiving the LTM handover command, the terminal device can initiate random access on the target cell.

[0098] In S25, the terminal device sends a CSI report to the network device on the target cell. Correspondingly, the network device receives the CSI report. For details regarding S25, please refer to the following description of the embodiment shown in Figure 5.

[0099] S21 and S22 will be explained in detail below.

[0100] In S21, the terminal device receives the first information on the original cell. In other words, in some embodiments of this disclosure, the network device sends the first information to the terminal device before sending the LTM cell handover command.

[0101] In some examples, the first information may include: the identifier of the target cell and the identifier of the CSI report configuration. Thus, the terminal device can determine, based on the identifier of the target cell, that the CSI report instructed by the network device to be reported by the terminal device is a CSI report of the target cell.

[0102] In other examples, the first information may include an identifier for the CSI report configuration, but not an identifier for the second cell. The terminal device can implicitly determine that the CSI report reported by the network device to the terminal device is the CSI report of the target cell. For example, the network device may send configuration information of candidate cells to the terminal device before cell handover. Each candidate cell corresponds to its own CSI report configuration. The terminal device can determine the target cell implicitly indicated by the first information based on the identifier for the CSI report configuration in the first information; that is, the terminal device can implicitly determine that the network device instructed the terminal device to report the CSI report of the target cell.

[0103] In some embodiments, the first information may be carried in a Physical Downlink Control Channel (PDCCH) order during the LTM process, which indicates the Random Access Channel (RACH) of the target cell. For example, the PDCCH order is the PDCCH order in the early synchronization process in S15 of Figure 1.

[0104] In some embodiments, the CSI report is a periodic report, and the first information is report configuration information used to configure the CSI report. That is, the first information is used to configure the CSI report for the target cell. For example, if the CSI report is a periodic report, the first CSI-RS resource is a periodic resource.

[0105] In other embodiments, the CSI report is a semi-persistent report, and the first information is report activation information, which is used to activate the CSI report. That is, the first information is used to activate the CSI report of the target cell.

[0106] Furthermore, the terminal device can send a confirmation message for the reported activation information to the network device. The reported activation information can be carried in a third MAC CE command, and the confirmation message for the reported activation information can be a HARQ ACK of the third MAC CE command.

[0107] For example, if the CSI report is a semi-persistent report, the first CSI-RS resource can be a periodic resource, or the first CSI-RS resource can be a semi-persistent resource.

[0108] In some other embodiments, the CSI report is an aperiodic report, and the first information is a report triggering information used to trigger the CSI report. That is, the first information is used to trigger the CSI report of the target cell.

[0109] For example, the first piece of information can be carried in downlink control information (DCI). For example, the DCI may include a CSI request field, which is used to indicate the identifier of the CSI report.

[0110] For example, if the CSI report is a non-periodic report, the first CSI-RS resource can be a periodic resource, or the first CSI-RS resource can be a semi-persistent resource, or the first CSI-RS resource can be a non-periodic resource.

[0111] In S22, the terminal device performs CSI measurements on the target cell. In some embodiments of this disclosure, the CSI measurement may begin in a first time unit. That is, the CSI measurement begins execution in the first time unit, or the starting time unit of the CSI measurement is the first time unit.

[0112] Alternatively, CSI measurements can begin after the first time unit. That is, CSI measurements can begin execution after the first time unit, or the starting time unit of the CSI measurements can be after the first time unit.

[0113] For example, the first CSI-RS resource is a periodic or semi-persistent resource, and the time interval between the start time unit of the CSI measurement and the first time unit is R1 time units, where R1 is a positive integer. The value of R1 can be configured by the network device or defined by the protocol.

[0114] For example, the first CSI-RS resource is a periodic resource or a semi-persistent resource, and the starting time unit of the CSI measurement can be the time unit of the first CSI-RS resource after the first time unit. Referring to Figure 3, which is a timing diagram according to some embodiments, the period of the first CSI-RS resource is denoted as T, the first time unit is t1, and the starting time unit of the CSI measurement is t2. In this case, the time interval between the starting time unit of the CSI measurement and the first time unit depends on the position of the first time unit and the period of the first CSI-RS resource.

[0115] Furthermore, the CSI measurement can end in the second time unit. That is, the CSI measurement ends in the second time unit, or the end time unit of the CSI measurement is the second time unit.

[0116] Alternatively, the CSI measurement can end L time units before the second time unit, where L is a positive integer. That is, the CSI measurement ends L time units before the second time unit, or the CSI measurement ends L time units before the second time unit. L can be configured by the network device or defined by the protocol. For example, in the second time unit, time unit N... i In this case, the end time unit of CSI measurement is time unit (N) i -L). In one example, L = 1.

[0117] Alternatively, the first CSI-RS resource may be a periodic or semi-persistent resource, and the end time unit of the CSI measurement may be the time unit of the first first CSI-RS resource preceding the second time unit.

[0118] The first time unit and the second time unit are described in detail below based on the type of the first CSI-RS resource.

[0119] Case 1: The first CSI-RS resource is a periodic resource.

[0120] In case 1, the first time unit can satisfy any one of 1) to 4).

[0121] 1) The first time unit is used to transmit resource configuration information.

[0122] In some embodiments of this disclosure, the terminal device receives resource configuration information on the original cell. The first time unit can be a time unit used for transmitting resource configuration information. For the terminal device, the "time unit used for transmitting resource configuration information" is the "time unit used for receiving resource configuration information," and for the network device, the "time unit used for transmitting resource configuration information" is the "time unit used for sending resource configuration information."

[0123] In other words, once the terminal device receives the resource configuration information, it can begin CSI measurement.

[0124] 2) The first time unit can be the time unit when the resource configuration information takes effect.

[0125] For example, resource configuration information can take effect in the time unit used to transmit resource configuration information.

[0126] For example, resource configuration information can take effect several time units after the time unit used to transmit resource configuration information.

[0127] It should be noted that in this paper, "several time units" refers to "one or more time units," and the value of "several" is not limited. "Several time units" can also be understood as "an offset of a certain duration" or "a time interval of a certain duration."

[0128] 3) The first time unit is used to transmit the first information.

[0129] In other words, the first time unit can be a time unit used to transmit the first information.

[0130] In this paper, for a terminal device, "time unit for transmitting first information" means "time unit for receiving first information", and for a network device, "time unit for transmitting first information" means "time unit for sending first information".

[0131] For example, upon receiving the first information in the first time unit, the terminal device begins performing CSI measurements. Alternatively, upon receiving the first information in the first time unit, the terminal device may begin performing CSI measurements several time units after the first time unit (e.g., after a time offset from the first time unit).

[0132] 4) The first time unit is used to transmit confirmation information for the first information.

[0133] In other words, the first time unit is the time unit used to transmit confirmation information for the first information.

[0134] In this document, for a terminal device, "the time unit for transmitting confirmation information of the first information" is "the time unit for sending confirmation information of the first information", and for a network device, "the time unit for transmitting confirmation information of the first information" is "the time unit for receiving confirmation information of the first information".

[0135] For example, if the terminal device sends an acknowledgment of the first information in the first time unit, the terminal device may begin performing CSI measurements in the first time unit. Alternatively, if the terminal device sends an acknowledgment of the first information in the first time unit, the terminal device may begin performing CSI measurements several time units after the first time unit.

[0136] For example, a CSI report is a semi-continuous report, where the first information is the report activation information and the first time unit is the time unit used to transmit confirmation information for the report activation information.

[0137] Furthermore, in case 1, the second time unit can satisfy at least one of a) to n).

[0138] a) The second time unit is used to transmit LTM cell handover commands.

[0139] That is, the second time unit is the time unit used to transmit LTM cell handover commands.

[0140] In this paper, for terminal devices, "time unit for transmitting LTM cell handover commands" means "time unit for receiving LTM cell handover commands", and for network devices, "time unit for transmitting LTM cell handover commands" means "time unit for sending LTM cell handover commands".

[0141] For example, if the terminal device receives an LTM cell handover command in the second time unit, the terminal device can end the CSI measurement in the second time unit.

[0142] For example, if the terminal device receives an LTM cell handover command in the second time unit, the terminal device can end the CSI measurement in the next time unit after the second time unit.

[0143] For example, if the terminal device receives an LTM cell handover command in the second time unit, the terminal device can end the CSI measurement several time units after the second time unit.

[0144] b) The second time unit is used to transmit confirmation information for the LTM cell handover command.

[0145] In other words, the second time unit is the time unit used to transmit confirmation information for LTM cell handover commands.

[0146] In this paper, for terminal devices, "the time unit for transmitting confirmation information of LTM cell handover commands" is "the time unit for sending confirmation information of LTM cell handover commands", and for network devices, "the time unit for transmitting confirmation information of LTM cell handover commands" is "the time unit for receiving LTM cell handover commands".

[0147] For example, if the terminal device sends confirmation information for the LTM cell handover command in the second time unit, the terminal device can end the CSI measurement in the second time unit.

[0148] For example, if the terminal device sends confirmation information for the LTM cell handover command in the second time unit, the terminal device can end the CSI measurement in the next time unit after the second time unit.

[0149] For example, if the terminal device sends confirmation information for the LTM cell handover command in the second time unit, the terminal device can end the CSI measurement several time units after the second time unit.

[0150] c) The second time unit is the N1th time unit after the time unit used to transmit the confirmation information of the LTM cell handover command, where N1 is a positive integer. N1 can be configured by the network device or defined by the protocol.

[0151] For example, the time unit used to transmit confirmation information for LTM cell handover commands is time unit N. i In this case, the second time unit is a time unit (N) i +N1).

[0152] For example,

[0153] Where μ is the subcarrier spacing configuration, This represents the number of time slots in the subframe. For k mac Subcarrier spacing configuration, k mac Configured by higher-level signaling.

[0154] d) The second time unit is the time unit when the pre-configuration information takes effect and / or the time unit when the TCI status of the target cell carried by the LTM cell handover command takes effect.

[0155] In this paper, pre-configuration information is used to configure the cell parameters of the target cell. For example, before sending an LTM cell handover command, a network device can send pre-configuration information to a terminal device so that the terminal device can obtain the general configuration of the target cell. As mentioned above, the general configuration may include at least one of the following: measurement configuration, resource configuration, mobility configuration, and synchronization configuration.

[0156] "Pre-configuration information" taking effect can mean that the terminal device uses the cell parameters configured in the pre-configuration information to communicate. For example, the pre-configuration information includes the cell's measurement configuration, resource configuration, mobility configuration, synchronization configuration, etc. After the pre-configuration information takes effect, the network device can provide services to the terminal device based on the pre-configuration information of the target cell.

[0157] "The TCI status of the target cell carried in the LTM cell handover command is effective" can mean that the terminal device uses the TCI status of the target cell carried in the LTM cell handover command to communicate with the network device.

[0158] For example, if the TCI status of the target cell carried by the second time unit pre-configuration information and the LTM cell handover command has taken effect, the terminal device can end the CSI measurement in the second time unit, the time unit before the second time unit, or several time units before the second time unit.

[0159] In this article, "the TCI status of the target cell carried by the LTM cell handover command is effective" can also be replaced with "the information of the target cell carried by the LTM cell handover command is effective". The information of the target cell carried by the LTM cell handover command may include the TCI status of the target cell and the parameters for providing services to the terminal device in the target cell.

[0160] e) The second time unit is used to transmit CSI reports.

[0161] In other words, the second time unit is the time unit used for transmitting CSI reports.

[0162] In this article, for terminal devices, "time unit for transmitting CSI reports" means "time unit for sending CSI reports", and for network devices, "time unit for transmitting CSI reports" means "time unit for receiving CSI reports".

[0163] For example, if the terminal device sends a CSI report in the second time unit, the terminal device may end the CSI measurement in the second time unit or in the time unit preceding the second time unit or several time units preceding the second time unit.

[0164] f) The second time unit is the time unit when the random access response is received in the target cell.

[0165] The second time unit is the time unit in which the terminal device receives the random access response in the target cell. Correspondingly, the second time unit is the time unit in which the network device sends the random access response.

[0166] After receiving an LTM cell handover command, the terminal device can initiate random access on the target cell. For example, the terminal device can send a random access request to the network device on the target cell, and the network device can then send a random access response to the terminal device. Upon receiving the random access response on the target cell, the terminal device can terminate the CSI measurement.

[0167] g) The second time unit is the time unit in which message 3 is sent in the target cell.

[0168] The second time unit is the time unit in which the terminal device sends message 3 in the target cell. Correspondingly, the second time unit is the time unit in which the network device receives message 3.

[0169] For example, after receiving an LTM cell handover command, the terminal device can initiate random access on the target cell. During the random access procedure initiated by the terminal device on the target cell, the terminal device sends message 3 to the network device. The terminal device can end the CSI measurement at the time unit of sending message 3, or it can end the CSI measurement several time units before sending message 3.

[0170] h) The second time unit is the time unit in which the RRC reconfiguration completion message is sent in the target cell.

[0171] The second time unit is the time unit when the terminal device sends the RRC reconfiguration completion message in the target cell. Correspondingly, the second time unit is the time unit when the network device receives the RRC reconfiguration completion message.

[0172] For example, after completing random access in the target cell, the terminal device sends an RRC reconfiguration complete message to the network device in the target cell. The terminal device can end the CSI measurement at the time unit when sending the RRC reconfiguration complete message, or it can end the CSI measurement several time units before sending the RRC reconfiguration complete message.

[0173] i) The second time unit is the time unit when the network scheduling signaling is first received after the target cell completes the RRC reconfiguration.

[0174] After the terminal device completes RRC reconfiguration in the target cell, the network device sends network scheduling signaling to the terminal device. This network scheduling signaling can be used to schedule the terminal device to perform uplink transmission and / or downlink reception. For the terminal device, the second time unit can be the time unit at which it first receives the network scheduling signaling. Correspondingly, the second time unit can be the time unit at which the network device sends the network scheduling signaling.

[0175] j) The second time unit is the time unit when the release information of the first CSI-RS resource is received in the target cell.

[0176] The second time unit is the time unit in which the terminal device receives the release information of the first CSI-RS resource in the target cell. Correspondingly, for the network device, the second time unit can be the time unit in which the network device sends the release information of the first CSI-RS resource.

[0177] For example, after a terminal device performs a cell handover and switches to the target cell, the network device can send a release message for the first CSI-RS resource to the terminal device. After receiving the release message, the terminal device will no longer receive CSI-RS on the first CSI-RS resource. For example, if the terminal device receives the release message for the first CSI-RS resource on the target cell, the terminal device can terminate CSI measurement.

[0178] k) The second time unit is the time unit when the reconfiguration information of the first CSI-RS resource is received in the target cell.

[0179] The second time unit is the time unit in which the terminal device receives the reconfiguration information of the first CSI-RS resource in the target cell. Correspondingly, for the network device, the second time unit can be the time unit in which the network device sends the reconfiguration information of the first CSI-RS resource.

[0180] For example, after a terminal device performs a cell handover and switches to the target cell, the network device can send reconfiguration information for the first CSI-RS resource to the terminal device. This reconfiguration information is used to reconfigure the first CSI-RS resource used for CSI measurements. Upon receiving the reconfiguration information, the terminal device no longer receives CSI-RS data on the original first CSI-RS resource. Once the terminal device receives the reconfiguration information for the first CSI-RS resource on the target cell, it can terminate CSI measurements.

[0181] l) The second time unit is the time unit in which the release information of the first CSI-RS resource received in the target cell takes effect.

[0182] In short, the second time unit is the time unit in which the release information of the first CSI-RS resource takes effect. For example, the release information of the first CSI-RS resource taking effect can mean that the network device indicates that the first CSI-RS resource has been deleted through a release message, that is, the first CSI-RS resource no longer exists. Furthermore, the time-frequency position of the original first CSI-RS resource can be used by the network device to configure new signals or channels or to no longer use it.

[0183] m), the second time unit is the time unit when the reconfiguration information of the first CSI-RS resource received in the target cell takes effect.

[0184] In short, the second time unit is the time unit in which the reconfiguration information of the first CSI-RS resource takes effect.

[0185] For example, the reconfiguration information of the first CSI-RS resource taking effect can mean that the network device changes the time-frequency position of the first CSI-RS resource or releases the first CSI-RS resource through the reconfiguration information, so that CSI-RS will no longer be transmitted at the original time-frequency position of the first CSI-RS resource.

[0186] (n) By the second time unit, the number of CSI-RS transmissions on the first CSI-RS resource has reached K1 times, where K1 is a positive integer. K1 can be configured by the network device or defined by the protocol.

[0187] In this document, "the number of CSI-RS transmissions on the first CSI-RS resource" can be replaced with "the number of CSI measurements". For example, the number of CSI-RS transmissions on the first CSI-RS resource is counted starting from the start time unit of the CSI measurement. When the number of CSI-RS transmissions on the first CSI-RS resource reaches K1 times, the terminal device can end the CSI measurement.

[0188] Case 2: The first CSI-RS resource is a semi-persistent resource.

[0189] In case 2, the first time unit can satisfy any one of 1′) to 4′).

[0190] 1′) The first time unit can be used to transmit resource activation commands.

[0191] In some embodiments of this disclosure, the terminal device receives a resource activation command on the original cell. The first time unit can be a time unit used for transmitting the resource activation command. For the terminal device, the "time unit used for transmitting the resource activation command" is the "time unit used for receiving the resource activation command," and for the network device, the "time unit used for transmitting the resource activation command" is the "time unit used for sending the resource activation command."

[0192] In other words, the terminal device can begin CSI measurement once it receives a resource activation command.

[0193] 2′) The first time unit can be the time unit in which the resource activation command takes effect.

[0194] For example, the time unit in which the resource activation command takes effect can be the M1th time unit after the time unit used to send the confirmation information for the resource activation command, where M1 is a positive integer. The value of M1 can be defined by the protocol or configured by the network device.

[0195] For example,

[0196] Where μ is the subcarrier spacing configuration, This represents the number of time slots in the subframe. For Subcarrier spacing configuration, k mac Configured by network devices.

[0197] 3') The first time unit can be used to transmit the first information. For details regarding 3'), please refer to the relevant description above; it will not be repeated here.

[0198] 4') The first time unit can be used to transmit confirmation information for the first information. For details regarding 4'), please refer to the relevant description above; it will not be repeated here.

[0199] Furthermore, in case 2, the second time unit can satisfy at least one of a′) to p′).

[0200] a′), the second time unit is used to transmit LTM cell handover commands. The details of a′) can be found in the description of a′ above, and will not be repeated here.

[0201] b′) The second time unit is used to transmit confirmation information for the LTM cell handover command. The details of b′) can be found in the description of b′ above, and will not be repeated here.

[0202] c′) The second time unit is the N1th time unit after the time unit used to transmit the confirmation information of the LTM cell handover command, where N1 is a positive integer. The details of c′) can be found in the description of c′ above, and will not be repeated here.

[0203] d′) The second time unit is the time unit when the pre-configuration information takes effect and / or the time unit when the TCI status of the target cell carried by the LTM cell handover command takes effect. The content of d′) can be found in the relevant description of d) above, and will not be repeated here.

[0204] e′), the second time unit is used to transmit CSI reports. The details of e′ can be found in the description of e′ above, and will not be repeated here.

[0205] f′), the second time unit is the time unit when the random access response is received in the target cell. The details of f′) can be found in the description of f′ above, and will not be repeated here.

[0206] g′), the second time unit is the time unit for sending message 3 in the target cell. The details of g′) can be found in the description of g′ above, and will not be repeated here.

[0207] h′) is the second time unit, which is the time unit when the RRC reconfiguration completion message is sent in the target cell. The content of h′) can be found in the description of h′ above, and will not be repeated here.

[0208] i′) The second time unit is the time unit when the network scheduling signaling is first received after the target cell completes the RRC reconfiguration. The content of i′) can be found in the description of i′ above, and will not be repeated here.

[0209] j′), the second time unit is the time unit when the release information of the first CSI-RS resource is received in the target cell. The content of j′) can be found in the description of j′ above, and will not be repeated here.

[0210] k′), the second time unit is the time unit when the reconfiguration information of the first CSI-RS resource is received in the target cell. The details of k′) can be found in the description of k′ above, and will not be repeated here.

[0211] l′) The second time unit is the time unit when the release information of the first CSI-RS resource received in the target cell takes effect. The content of l′) can be found in the description of l′ above, and will not be repeated here.

[0212] m′), the second time unit is the time unit when the reconfiguration information of the first CSI-RS resource received in the target cell takes effect. The content of m′) can be found in the description of m′ above, and will not be repeated here.

[0213] n′), the second time unit is the time unit when the deactivation command for the first CSI-RS resource is received in the target cell.

[0214] The second time unit can be the time unit when the terminal device receives the deactivation command for the first CSI-RS resource in the target cell. Correspondingly, for the network device, the second time unit can be the time unit when the network device sends the deactivation command for the first CSI-RS resource. For example, if the first CSI-RS resource is a semi-persistent resource, the deactivation command is used to deactivate the first CSI-RS resource.

[0215] For example, if the terminal device receives a deactivation command for the first CSI-RS resource on the target cell, the terminal device can terminate the CSI measurement.

[0216] The second time unit is the M2th time unit after the time unit used to send the confirmation information of the deactivation command for the first CSI-RS resource in the target cell, where M2 is a positive integer. In other words, the second time unit can be the time unit when the deactivation command takes effect.

[0217] After receiving the deactivation command for the first CSI-RS resource, the terminal device can send a confirmation message for the deactivation command to the network device.

[0218] For example, the time unit used to transmit the confirmation information for the deactivation command is time unit N. i In this case, the second time unit is a time unit (N) i +M2).

[0219] For example,

[0220] Where μ is the subcarrier spacing configuration, This represents the number of time slots in the subframe. For k mac Subcarrier spacing configuration, k mac Configured by network devices.

[0221] By the second time unit, the number of CSI-RS transmissions on the first CSI-RS resource has reached K1 times, where K1 is a positive integer. The details of p′) can be found in the description of n) above, and will not be repeated here.

[0222] Case 3: The first CSI-RS resource is a non-periodic resource.

[0223] When the first CSI-RS resource is aperiodic, the terminal device performs CSI measurements within the time unit of the first CSI-RS resource. For example, the time interval between the first time unit and the time unit of the first CSI-RS resource is the first offset. The first offset can be defined by a protocol or configured by a network device. In this document, the "first offset" may be referred to as the "first trigger offset".

[0224] The first time unit can be a time unit used for transmitting DCI. For terminal devices, the first time unit can be a time unit used for receiving DCI; for network devices, the first time unit can be a time unit used for transmitting DCI.

[0225] DCI can be used to trigger CSI reports. In other words, DCI can be the DCI that carries report triggering information as mentioned above. Alternatively, DCI can be the resource triggering command mentioned above, that is, DCI can be used to trigger the first CSI-RS resource. DCI triggering the first CSI-RS resource can be understood as DCI triggering the terminal device to receive CSI-RS on the first CSI-RS resource to perform CSI measurements.

[0226] For more details on the above embodiments, please refer to the relevant descriptions of other embodiments in this document, which will not be repeated here.

[0227] The preceding text mainly uses the example of the terminal device performing CSI measurement on the target cell before receiving the LTM cell handover command. Of course, in some embodiments, CSI measurement may also begin after the terminal device receives the LTM cell handover command.

[0228] In some embodiments, CSI measurement begins after the terminal device receives the LTM cell handover command. That is, the terminal device performs CSI measurement on the target cell after receiving the LTM cell handover command. In other words, the starting time unit of the CSI measurement is located after the time unit used to transmit the LTM cell handover command.

[0229] Referring to Figure 4, which is a signaling interaction diagram of another communication method according to some embodiments, the communication method shown in Figure 4 may include S41, S42, S43, S44, and S45.

[0230] In S41, the network device sends an LTM cell handover command to the terminal device. Correspondingly, the terminal device receives the LTM cell handover command.

[0231] In S42, in response to the LTM handover command, the terminal device switches from the original cell to the target cell.

[0232] For details regarding S41 and S42, please refer to the descriptions of S23 and S24 above; they will not be repeated here.

[0233] In S43, the network device sends either first information or second information to the terminal device. The first information is used at least to instruct the reporting of a CSI report, and the second information is used to trigger the CSI report. Correspondingly, the terminal device receives the first information or second information in the target cell.

[0234] In some embodiments, the network device sends first information to the terminal device to instruct the terminal device to report the CSI of the target cell. Unlike the embodiment shown in FIG2, in some embodiments of this disclosure, the network device instructs the terminal device to report the CSI after the terminal device completes LTM cell handover.

[0235] In other embodiments, the network device sends second information to the terminal device to trigger the terminal device to report a CSI report of the target cell, and the CSI report is an aperiodic report. The first CSI-RS resource associated with the CSI report triggered by the second information can be an aperiodic resource.

[0236] In some embodiments, the first or second information may be carried in an LTM cell handover command. Alternatively, the first or second information may be carried in downlink signaling during a random access procedure performed in the target cell, where the downlink signaling may be a random access response. Or, the first or second information may be carried in signaling sent by the network device in the target cell after the cell handover is completed, indicating the reporting of a CSI report.

[0237] For details regarding the first piece of information, please refer to the relevant descriptions above.

[0238] In S44, the terminal device performs CSI measurements on the target cell to obtain a CSI report.

[0239] In S45, the terminal device sends a CSI report on the target cell.

[0240] In some embodiments of this disclosure, CSI measurements may begin in a third time unit. That is, CSI measurements are performed starting in a third time unit, or the starting time unit for CSI measurements is the third time unit.

[0241] Alternatively, CSI measurements can begin after the third time unit. That is, CSI measurements can be performed after the third time unit, or the starting time unit of the CSI measurements can be after the third time unit.

[0242] For example, the first CSI-RS resource is a periodic or semi-persistent resource, and the time interval between the start time unit and the third time unit of the CSI measurement is R2 time units, where R2 is a positive integer. The value of R2 can be configured by the network device or defined by the protocol.

[0243] For example, if the first CSI-RS resource is a periodic resource or a semi-persistent resource, the starting time unit of the CSI measurement can be the time unit of the first first CSI-RS resource after the third time unit.

[0244] Furthermore, the CSI measurement can end in the fourth time unit. That is, the CSI measurement ends in the fourth time unit, or the end time unit of the CSI measurement is the fourth time unit.

[0245] Alternatively, the CSI measurement can end within the first Q time units of the fourth time unit, where Q is a positive integer. That is, the CSI measurement ends in the Qth time unit before the fourth time unit, or the CSI measurement ends in the Qth time unit before the fourth time unit. Q can be configured by the network device or defined by the protocol. For example, in the fourth time unit, time unit N... i In this case, the end time unit of CSI measurement is time unit (N) i -Q). In one example, Q = 1.

[0246] Alternatively, the first CSI-RS resource may be a periodic or semi-persistent resource, and the CSI measurement may end in the first first CSI-RS resource prior to the fourth time unit. That is, the end time unit of the CSI measurement is the time unit of the first first CSI-RS resource prior to the fourth time unit.

[0247] The third and fourth time units are described in detail below based on the type of the first CSI-RS resource.

[0248] Case 4: The first CSI-RS resource is a periodic resource.

[0249] In some embodiments of this disclosure, the terminal device may receive resource configuration information on the original cell; that is, the network device sends resource configuration information to the terminal device on the original cell. In this case, the network device does not send CSI-RS immediately after sending the resource configuration information, but instead sends CSI-RS after the terminal device hands over to the target cell. Alternatively, the network device may send resource configuration information to the terminal device on the target cell during or after the terminal device performs a cell handover.

[0250] In case 4, the third time unit can satisfy any one of 1″) to 4″).

[0251] 1″) The third time unit is used to transmit LTM cell handover commands.

[0252] In other words, the third time unit can be the time unit used to transmit LTM cell handover commands.

[0253] For example, if the terminal device receives an LTM cell handover command in the third time unit, the terminal device can start performing CSI measurements in the third time unit.

[0254] For example, if the terminal device receives an LTM cell handover command in the third time unit, the terminal device can start performing CSI measurements in the next time unit after the third time unit.

[0255] 2″) The third time unit is used to transmit confirmation information for LTM cell handover commands.

[0256] In other words, the third time unit can be a time unit used to transmit confirmation information for LTM cell handover commands.

[0257] For example, if the terminal device sends confirmation information for the LTM cell handover command in the third time unit, the terminal device can start performing CSI measurements in the third time unit.

[0258] For example, if the terminal device sends confirmation information for the LTM cell handover command in the third time unit, the terminal device can start performing CSI measurements in the next time unit after the third time unit.

[0259] 3″) The third time unit is the N2nd time unit after the time unit used to transmit the confirmation information of the LTM cell handover command, where N2 is a positive integer. N2 can be configured by the network device or defined by the protocol.

[0260] The time unit used to transmit confirmation information for LTM cell handover commands is time unit N. i In this case, the third time unit is a time unit (N) i +N2). Terminal devices can operate within time units (N i CSI measurements can be started at +N2) or at time unit (N i The CSI measurement begins in the next time unit after +N2).

[0261] For example,

[0262] Where μ is the subcarrier spacing configuration, This represents the number of time slots in the subframe. For k mac Subcarrier spacing configuration, k mac Configured by network devices.

[0263] 4″) The third time unit is the time unit when the pre-configuration information takes effect and / or the time unit when the TCI status of the target cell carried by the LTM cell handover command is displayed.

[0264] For example, if the TCI status of the target cell carried by the third time unit pre-configuration information and the LTM cell handover command is already in effect, the terminal device can start CSI measurement in the third time unit or the next time unit after the third time unit.

[0265] 5″) The third time unit is used to transmit the first information.

[0266] In other words, the third time unit can be a time unit used to transmit the first information.

[0267] For example, if the terminal device receives the first information in the third time unit, the terminal device may begin performing CSI measurements. Alternatively, if the terminal device receives the first information in the third time unit, it may begin performing CSI measurements in the next time unit after the third time unit.

[0268] 6″) The third time unit is used to transmit confirmation information for the first information.

[0269] In other words, the third time unit can be a time unit used to transmit confirmation information for the first information.

[0270] For example, if the terminal device sends an acknowledgment of the first information in the third time unit, the terminal device may begin performing CSI measurements in the third time unit. Alternatively, if the terminal device sends an acknowledgment of the first information in the third time unit, the terminal device may begin performing CSI measurements several time units after the third time unit.

[0271] Furthermore, in case 4, the fourth time unit can satisfy at least one of a″) to j″).

[0272] a″), the fourth time unit is used to transmit CSI reports.

[0273] In other words, the fourth time unit can be the time unit used to transmit CSI reports.

[0274] For example, if the terminal device sends a CSI report in the fourth time unit, the terminal device can end the CSI measurement in the fourth time unit or in the time unit preceding the fourth time unit.

[0275] b″), the fourth time unit is the time unit when the random access response is received in the target cell.

[0276] The fourth time unit can be the time unit in which the terminal device receives the random access response in the target cell. Correspondingly, the fourth time unit can be the time unit in which the network device sends the random access response.

[0277] For information about b″), please refer to the description of f) above.

[0278] c″), the fourth time unit is the time unit for sending message 3 in the target cell.

[0279] The fourth time unit can be the time unit in which the terminal device sends message 3 in the target cell. Correspondingly, the fourth time unit can be the time unit in which the network device receives message 3.

[0280] For information about c″), please refer to the description of g) above.

[0281] d″), the fourth time unit is the time unit for sending the RRC reconfiguration completion message in the target cell.

[0282] The fourth time unit can be the time unit when the terminal device sends the RRC reconfiguration completion message in the target cell. Correspondingly, the second time unit can be the time unit when the network device receives the RRC reconfiguration completion message.

[0283] For information about d″), please refer to the description of h″ above.

[0284] e″), the fourth time unit is the time unit when the network scheduling signaling is first received after the target cell completes the RRC reconfiguration.

[0285] For the terminal device, the fourth time unit can be the time unit when it first receives network scheduling signaling in the target cell. Correspondingly, the fourth time unit can be the time unit when the network device first sends network scheduling signaling to the terminal device in the target cell.

[0286] For information about e″), please refer to the description of i) above.

[0287] f″), the fourth time unit is the time unit when the release information of the first CSI-RS resource is received in the target cell.

[0288] The fourth time unit is the time unit in which the terminal device receives the release information of the first CSI-RS resource in the target cell. Correspondingly, for the network device, the fourth time unit can be the time unit in which the network device sends the release information of the first CSI-RS resource.

[0289] For information about f″), please refer to the description of j) above.

[0290] g″), the fourth time unit is the time unit when the reconfiguration information of the first CSI-RS resource is received in the target cell.

[0291] The fourth time unit is the time unit in which the terminal device receives the reconfiguration information of the first CSI-RS resource in the target cell. Correspondingly, for the network device, the fourth time unit can be the time unit in which the network device sends the reconfiguration information of the first CSI-RS resource.

[0292] For information about g″), please refer to the description of k″ above.

[0293] h″), the fourth time unit is the time unit when the release information of the first CSI-RS resource received in the target cell takes effect.

[0294] In short, the fourth time unit is the time unit in which the release information of the first CSI-RS resource takes effect. For details regarding h″), please refer to the relevant description of l) above.

[0295] i″), the fourth time unit is the time unit when the reconfiguration information of the first CSI-RS resource received in the target cell takes effect.

[0296] In short, the fourth time unit is the time unit in which the reconfiguration information of the first CSI-RS resource takes effect. For details regarding i″), please refer to the relevant description of m) above.

[0297] (j″) By the fourth time unit, the number of CSI-RS transmissions on the first CSI-RS resource reaches K2 times, where K2 is a positive integer. K2 can be configured by the network device or defined by the protocol.

[0298] The number of CSI-RS transmissions on the first CSI-RS resource is counted starting from the start time unit of the CSI measurement. When the number of CSI-RS transmissions on the first CSI-RS resource reaches K2 times, the terminal device can end the CSI measurement.

[0299] Case 5: The first CSI-RS resource is a semi-persistent resource.

[0300] In some embodiments of this disclosure, the terminal device may receive resource configuration information on the original cell; that is, the network device sends resource configuration information to the terminal device on the original cell. Further, the network device may send a resource activation command to the terminal device on the original cell. In this case, the network device does not send CSI-RS immediately after sending the resource activation command, but rather sends CSI-RS after the terminal device has switched to the target cell. Alternatively, the network device may send the resource activation command to the terminal device on the target cell during or after the terminal device is performing a cell handover.

[0301] In case 5, the third time unit can satisfy any one of 1″′) to 6″′).

[0302] 1″′), the third time unit is used to transmit LTM cell handover commands.

[0303] The content regarding 1″′ can be found in the above description of 1″′, and will not be repeated here.

[0304] 2″′), the third time unit is used to transmit confirmation information for LTM cell handover commands.

[0305] The content regarding 2″′ can be found in the description of 2″′ above, and will not be repeated here.

[0306] 3″′), the third time unit is the N2th time unit after the time unit used to transmit the confirmation information of the LTM cell handover command, where N2 is a positive integer.

[0307] The content regarding 3″′ can be found in the description of 3″′ above, and will not be repeated here.

[0308] 4″′), the third time unit is the time unit when the pre-configuration information takes effect and / or the time unit when the TCI status of the target cell carried by the LTM cell handover command is displayed.

[0309] The content regarding 4″′ can be found in the description of 4″′ above, and will not be repeated here.

[0310] 5″′), the third time unit is used to transmit the first information.

[0311] The content regarding 5″′ can be found in the description of 5″′ above, and will not be repeated here.

[0312] 6″′), the third time unit is used to transmit confirmation information for the first information.

[0313] The content regarding 6″′ can be found in the description of 6″′ above, and will not be repeated here.

[0314] Furthermore, in case 5, the fourth time unit can satisfy at least one of a″′) to l″′).

[0315] a″′), the fourth time unit is used to transmit CSI reports.

[0316] For details regarding a″′), please refer to the relevant description of a″′ above, which will not be repeated here.

[0317] b″′), the fourth time unit is the time unit when the random access response is received in the target cell.

[0318] For details regarding b″′), please refer to the relevant description of b″′ above, which will not be repeated here.

[0319] c″′), the fourth time unit is the time unit for sending message 3 in the target cell.

[0320] For details regarding c″′), please refer to the relevant description of c″′ above, which will not be repeated here.

[0321] The fourth time unit is the time unit for sending the RRC reconfiguration completion message in the target cell.

[0322] For details regarding d″′), please refer to the relevant description of d″′ above, which will not be repeated here.

[0323] e″′), the fourth time unit is the time unit when the network scheduling signaling is first received after the target cell completes the RRC reconfiguration.

[0324] For details regarding e″′), please refer to the relevant description of e″′ above, which will not be repeated here.

[0325] f″′), the fourth time unit is the time unit when the release information of the first CSI-RS resource is received in the target cell.

[0326] For details regarding f″′), please refer to the relevant description of f″′ above, which will not be repeated here.

[0327] g″′), the fourth time unit is the time unit when the reconfiguration information of the first CSI-RS resource is received in the target cell.

[0328] For details regarding g″′), please refer to the above description of g″′, which will not be repeated here.

[0329] h″′), the fourth time unit is the time unit when the release information of the first CSI-RS resource received in the target cell takes effect.

[0330] For details regarding h″′), please refer to the relevant description of h″′ above, which will not be repeated here.

[0331] The fourth time unit is the time unit when the reconfiguration information of the first CSI-RS resource received in the target cell takes effect.

[0332] The content regarding i″′ can be found in the description of i″′ above, and will not be repeated here.

[0333] The fourth time unit is the time unit when the deactivation command for the first CSI-RS resource is received in the target cell.

[0334] The fourth time unit is the time unit in which the terminal device receives the deactivation command for the first CSI-RS resource in the target cell. Correspondingly, for the network device, the fourth time unit can be the time unit in which the network device sends the deactivation command for the first CSI-RS resource. The first CSI-RS resource is a semi-persistent resource, and the deactivation command is used to deactivate the first CSI-RS resource.

[0335] For example, if the terminal device receives a deactivation command for the first CSI-RS resource on the target cell, the terminal device can terminate the CSI measurement.

[0336] k″′), the fourth time unit is the M3th time unit after the time unit used to send the confirmation information of the deactivation command of the first CSI-RS resource in the target cell, where M3 is a positive integer.

[0337] In other words, the fourth time unit can be the time unit in which the deactivation command takes effect.

[0338] The time unit used to transmit the confirmation information for the deactivation command is time unit N. i In this case, the fourth time unit is a time unit (N) i +M3).

[0339] For example,

[0340] Where μ is the subcarrier spacing configuration, This represents the number of time slots in the subframe. For k mac Subcarrier spacing configuration, k mac Configured by network devices.

[0341] By the fourth time unit, the number of CSI-RS transmissions on the first CSI-RS resource has reached K2 times, where K2 is a positive integer.

[0342] The content regarding l″′ can be found in the description of j″′ above, and will not be repeated here.

[0343] Case 6: The first CSI-RS resource is a non-periodic resource.

[0344] When the first CSI-RS resource is aperiodic, the terminal device performs CSI measurements within the time unit of the first CSI-RS resource. The time unit of the first CSI-RS resource can be a third time unit.

[0345] For example, the time interval between the third time unit and the time unit of the first CSI-RS resource is the second offset. The second offset can be defined by the protocol or configured by the network device. The third time unit can be a time unit used to transmit the second information. In this document, for the terminal device, "time unit used to transmit the second information" can be "time unit used to receive the second information"; for the network device, "time unit used to transmit the second information" can be "time unit used to send the second information". The "second offset" in this document can be referred to as the "second trigger offset".

[0346] For more details on the above embodiments, please refer to the relevant descriptions of other embodiments in this document, which will not be repeated here.

[0347] In some embodiments, the time for the terminal device to send CSI reports on the target cell can be limited so that the network device can promptly learn about the channel conditions of the target cell. It should be noted that some embodiments of this disclosure (such as the one shown in Figure 5) can be combined with the one shown in Figure 2, or with the one shown in Figure 4.

[0348] Referring to Figure 5, which is a signaling interaction diagram of another communication method according to some embodiments, the communication method shown in Figure 5 may include S51 and S52.

[0349] In S51, the terminal device performs CSI measurements on the target cell and obtains a CSI report.

[0350] For example, some embodiments of this disclosure can be combined with the solution shown in FIG2, that is, the terminal device can start CSI measurement before receiving the LTM cell handover command. Alternatively, some embodiments of this disclosure can be combined with the solution shown in FIG4, that is, the terminal device can start CSI measurement after receiving the LTM cell handover command.

[0351] For details regarding S51, please refer to the above descriptions of CSI measurements and CSI reports; they will not be repeated here.

[0352] In S52, the terminal device sends a CSI report to the network device on the target cell. Correspondingly, the network device receives the CSI report.

[0353] In some embodiments, the terminal device may send a CSI report on or after the fifth time unit.

[0354] For example, CSI reports can be periodic or semi-persistent. The time interval between the time unit of the channel resource carrying the CSI report and the fifth time unit is R3 time units, where R3 is a positive integer. The value of R3 can be configured by the network device or defined by the protocol.

[0355] For example, if the CSI report is a periodic or semi-persistent report, the channel resource carrying the CSI report could be the first uplink channel resource used to carry the CSI report after the fifth time unit. In this case, the time interval between the time unit of the uplink channel resource used to carry the CSI report and the fifth time unit depends on the position of the fifth time unit and the period of the CSI report.

[0356] For example, CSI reports are non-periodic reports, meaning that terminal devices can send CSI reports in the fifth time unit or several time units after the fifth time unit.

[0357] In some embodiments of this disclosure, the fifth time unit may be a time unit for transmitting first information. Alternatively, the fifth time unit may be a time unit for transmitting confirmation information of the first information. The content regarding the "time unit for transmitting first information" and the "time unit for transmitting confirmation information of the first information" can be referred to the relevant description above, and will not be repeated here.

[0358] In one example, the uplink channel resources used to carry the CSI report can be either message 3 or the uplink channel resources where the RRC reconfiguration completion message resides. When the uplink channel resources where message 3 or the RRC reconfiguration completion message resides are limited, the CSI report has a lower priority than message 3 or the RRC reconfiguration completion message. Message 3 refers to message 3 sent by the terminal device during the random access process on the target cell, and the RRC reconfiguration completion message refers to the RRC reconfiguration completion message sent by the terminal device after random access is completed on the target cell.

[0359] In some embodiments, the CSI report is a periodic report or a semi-persistent report, and the terminal device may send the CSI report at or after the sixth time unit. For example, the time interval between the time unit of the channel resource carrying the CSI report and the sixth time unit is R3 time units, where R3 is a positive integer. The value of R3 can be configured by the network device or defined by the protocol.

[0360] In some embodiments, the CSI report is a periodic report or a semi-persistent report, and the terminal device sends the CSI report according to the CSI report period. That is, the uplink channel resource used to carry the CSI report is a periodic resource. The terminal device may send the CSI report on the first uplink channel resource used to carry the CSI report after the sixth time unit. The uplink channel resource is a Physical Uplink Control Channel (PUCCH) resource or a Physical Uplink Shared Channel (PUSCH) resource. For example, the sixth time unit may satisfy any one of ① to ④.

[0361] ① The sixth time unit is used to transmit LTM cell handover commands.

[0362] For example, when a terminal device receives an LTM cell handover command, it can send a CSI report. Alternatively, if the terminal device performs CSI measurements on the target cell before receiving the LTM cell handover command, it can send a CSI report after receiving the command.

[0363] ② The sixth time unit is used to transmit confirmation information for LTM cell handover commands.

[0364] For example, after the terminal device sends an acknowledgment message for the LTM cell handover command, the terminal device can send a CSI report. For example, if the terminal device performs CSI measurements on the target cell before receiving the LTM cell handover command, the terminal device can send a CSI report after sending the acknowledgment message for the LTM cell handover command.

[0365] ③ The sixth time unit is the N4th time unit after the time unit used to transmit the confirmation information of the LTM cell handover command, where N4 is a positive integer.

[0366] For example, if the terminal device performs CSI measurement on the target cell before receiving the LTM cell handover command, the terminal device can send the CSI report in the N4th time unit after the time unit used to transmit the confirmation information for the LTM cell handover command.

[0367] The time unit used to transmit confirmation information for LTM cell handover commands is time unit N. i In this case, the sixth time unit can be a time unit (N) i +N4).

[0368] For example,

[0369] Where μ is the subcarrier spacing configuration, This represents the number of time slots in the subframe. For k mac Subcarrier spacing configuration, k mac Configured by network devices.

[0370] ④ The sixth time unit is the time unit when the pre-configuration information takes effect and / or the time unit when the TCI status of the target cell carried by the LTM cell handover command takes effect.

[0371] For example, if the pre-configuration information and the target cell's TCI status carried in the LTM cell handover command are both in effect, the terminal device can send a CSI report.

[0372] As described above, in some embodiments of this disclosure, the CSI report is a periodic report or a semi-continuous report, and the terminal device sends the CSI report according to the CSI report period. Further, in response to a stop-sending condition being met, the terminal device stops sending the CSI report. For example, the terminal device can determine whether the stop-sending condition is met, and if it is determined that the stop-sending condition is met, the terminal device stops sending the CSI report. The stop-sending condition includes at least one of (1) to (4):

[0373] (1) The number of CSI reports sent reaches K3, where K3 is a positive integer. K3 can be configured by the network device or defined by the protocol.

[0374] For example, the terminal device can count the number of times a CSI report is sent. When the number of CSI reports sent reaches K3, the terminal device can stop sending CSI reports.

[0375] (2) The terminal device receives network scheduling signaling for the first time after completing RRC reconfiguration in the target cell.

[0376] For example, if the terminal device receives network scheduling signaling for the first time after completing RRC reconfiguration on the target cell, the terminal device may no longer need to send a CSI report.

[0377] (3) Receive a stop transmission instruction message in the target cell.

[0378] For example, if the CSI report is a periodic or semi-persistent report, the stop transmission indication information could be a CSI report release message or a CSI report reconfiguration message. For instance, a network device could send a CSI report release message or a CSI report reconfiguration message to a terminal device. The CSI report release message is used to release the configured CSI report settings, while the CSI report reconfiguration message is used to configure a new CSI report settings. Once the terminal device receives the CSI report release message or reconfiguration message on the target cell, the terminal device can stop sending CSI reports.

[0379] For example, CSI reports are semi-persistent reports, and the indication to stop sending can be a CSI report deactivation command. For instance, a network device can send a CSI report deactivation command to a terminal device. The CSI report deactivation command is used to deactivate an already activated CSI report configuration. If the terminal device receives the CSI report deactivation command on the target cell, the terminal device can stop sending CSI reports.

[0380] (4) The stop transmission instruction received in the target cell takes effect.

[0381] As mentioned above, when the CSI report is a periodic or semi-continuous report, the stop transmission indication information can be a CSI report release or reconfiguration information. The CSI report release or reconfiguration information can be carried in RRC signaling. When the RRC signaling carrying the CSI report release or reconfiguration information is active, the CSI report release or reconfiguration information also becomes active.

[0382] In the case of a semi-continuous CSI report, the stop sending indication information can be a CSI report deactivation command. The CSI report deactivation command can be a MAC CE command. Furthermore, the terminal device can send a confirmation message for the deactivation command. Further, the deactivation command can be sent after the time unit of sending the confirmation message. Each time unit takes effect. Here, μ is the subcarrier spacing configuration. This represents the number of time slots in the subframe. For k mac Subcarrier spacing configuration, k mac Configured by network devices.

[0383] For more details on the above embodiments, please refer to the relevant descriptions of other embodiments in this document, which will not be repeated here.

[0384] In some embodiments, the terminal device requires resources during CSI measurement. The resources used for CSI measurement may be a CSI processing unit (CPU), which processes CSI reports. Processing CSI reports can refer to performing CSI measurements and generating CSI reports. The number of CPUs can represent the terminal device's ability to process CSI reports. Some embodiments of this disclosure limit the duration between the time unit of the first CSI-RS resource and the time unit used for reporting CSI reports to match the terminal device's ability to process CSI reports.

[0385] It should be noted that the solutions provided in some embodiments of this disclosure can be combined with one or more embodiments described above.

[0386] Referring to Figure 6, which is a signaling interaction diagram of another communication method according to some embodiments, the method shown in Figure 6 may include S61, S62, and S63.

[0387] In S61, the network device sends a CSI-RS to the terminal device on the first CSI-RS resource. Correspondingly, the terminal device receives a CSI-RS on the first CSI-RS resource.

[0388] For example, a network device sends a CSI-RS to a terminal device on a target cell. The first CSI-RS resource is associated with the CSI report of the target cell. The terminal device measures the received CSI-RS, obtains the measurement results, and generates a CSI report of the target cell based on the measurement results.

[0389] In S62, the network device sends an LTM cell handover command to the terminal device. Correspondingly, the terminal device receives the LTM cell handover command.

[0390] It should be noted that the execution order of S61 and S62 is not limited in some embodiments of this disclosure. The solutions of some embodiments of this disclosure can be combined with the solution shown in FIG2 or the solution shown in FIG4.

[0391] In S63, the terminal device sends a CSI report to the network device. Correspondingly, the network device receives the CSI report. For example, after receiving an LTM cell handover command, the terminal device performs a cell handover to switch from the original cell to the target cell. Further, the terminal device sends a CSI report to the network device on the target cell.

[0392] In some embodiments, CSI measurement may begin before or after receiving an LTM cell handover command, and the CSI report may be a periodic or semi-persistent report. In this manner, the time interval between the first and second time subunits is greater than or equal to X time subunits, where the second time subunit may be the last time subunit used to send the CSI report. The first time subunit precedes the second time subunit, where X is a positive integer, which may be configured by the network device or defined by the protocol. The first time subunit may be any one of A) to C):

[0393] A) The first time subunit is the first time subunit of the start time unit of the first CSI-RS resource. The start time unit of the first CSI-RS resource can be the time unit of the first CSI-RS resource.

[0394] B) The first time sub-unit is the last time sub-unit of the end time unit of the first CSI-RS resource. The end time unit of the first CSI-RS resource can be the time unit of the last CSI-RS resource.

[0395] C) The first time sub-unit is the first time sub-unit of the time unit used to transmit the first information. The content regarding the "time unit used to transmit the first information" can be found in the relevant description above, and will not be repeated here.

[0396] Referring to Figure 7, which is another timing diagram according to some embodiments, in Figure 7, t2 represents the last time sub-unit of the time unit used to send the CSI report, t1 represents the first time sub-unit of the first CSI-RS resource in the first CSI-RS resource associated with the CSI report, t3 represents the last time sub-unit of the last CSI-RS resource in the first CSI-RS resource associated with the CSI report, and t4 represents the first time sub-unit of the time unit used to transmit the first information. The time interval between t1 and t2 is greater than or equal to X time sub-units, or the time interval between t3 and t2 is greater than or equal to X time sub-units, or the time interval between t4 and t2 is greater than or equal to X time sub-units.

[0397] It should be noted that some embodiments of this disclosure do not limit the order between t1 and t4; the fact that t4 is located after t1 in Figure 7 is merely an example. In other words, the first time sub-unit of the time unit used to transmit the first information can be located after the first time sub-unit of the first CSI-RS resource in the first CSI-RS resource associated with the CSI report, or the first time sub-unit of the time unit used to transmit the first information can be located before the first time sub-unit of the first CSI-RS resource in the first CSI-RS resource associated with the CSI report.

[0398] Furthermore, some embodiments of this disclosure do not limit the order between t3 and t4; the fact that t4 is located after t3 in Figure 7 is merely an example. In other words, the first time sub-unit of the time unit used to transmit the first information can be located after the last time sub-unit of the last CSI-RS resource in the first CSI-RS resource associated with the CSI report, or the first time sub-unit of the time unit used to transmit the first information can be located before the last time sub-unit of the last CSI-RS resource in the first CSI-RS resource associated with the CSI report.

[0399] In other embodiments, CSI measurements may begin before receiving an LTM cell handover command, and the CSI report may be a periodic report or a semi-persistent report. In this case, the time interval between the first time subunit and the second time subunit is greater than or equal to X time subunits. The content of the first time subunit can be referred to the relevant description above, and the second time subunit can be any of the following:

[0400] A′), the second time sub-unit is the last time sub-unit of the time unit used for transmitting LTM cell handover commands. The content regarding the "time unit used for transmitting LTM cell handover commands" can be found in the relevant description above, and will not be repeated here.

[0401] B′), the second time sub-unit is the last time sub-unit of the time unit used to transmit confirmation information for LTM cell handover commands. The content of the "time unit used to transmit confirmation information for LTM cell handover commands" can be found in the relevant description above, and will not be repeated here.

[0402] C′), the second time sub-unit is the last time sub-unit of the N5th time unit after the time unit used to transmit the confirmation information of the LTM cell handover command, where N5 is a positive integer.

[0403] The time unit used to transmit confirmation information for LTM cell handover commands is time unit N. i In this case, the second time sub-unit can be a time unit (N) i The last time subunit in +N5).

[0404] For example, Where μ is the subcarrier spacing configuration, This represents the number of time slots in the subframe. For k mac Subcarrier spacing configuration, k mac Configured by network devices.

[0405] D′), the second time sub-unit is the last time sub-unit of the time unit in which the pre-configuration information takes effect and / or the last time sub-unit of the time unit in which the TCI status of the target cell carried in the LTM cell handover command takes effect. The content regarding "the last time sub-unit of the time unit in which the pre-configuration information takes effect and / or the time unit in which the TCI status of the target cell carried in the LTM cell handover command takes effect" can be found in the description above and will not be repeated here.

[0406] In some other embodiments, the CSI report is an aperiodic report, and the CSI measurement may begin before or after receiving the LTM cell handover command. The time interval between the third time subunit and the second time subunit is greater than or equal to Y time subunits, and / or the time interval between the fourth time subunit and the second time subunit is greater than or equal to Y' time subunits, where Y is a positive integer and Y' is a positive integer.

[0407] The third time sub-unit is the first time sub-unit of the time unit used to transmit the second information. For details regarding "second information" and "time unit used to transmit the second information," please refer to the description above; it will not be repeated here. The fourth time sub-unit is the first time sub-unit of the start time unit of the first CSI-RS resource, or the last time sub-unit of the end time unit of the first CSI-RS resource. For details regarding "start time unit of the first CSI-RS resource" and "end time unit of the first CSI-RS resource," please refer to the description above; it will not be repeated here.

[0408] Y and Y' are positive integers, and Y and Y' can be configured by network devices or defined by protocols.

[0409] The third time sub-unit is located before the second time sub-unit, and the fourth time sub-unit is located before the second time sub-unit.

[0410] The second time subunit can be the last time subunit of the time unit used to send the CSI report, or the second time subunit can be A′), or the second time subunit can be B′), or the second time subunit can be D′), or the second time subunit can be the last time subunit of the N6th time unit after the time unit used to send the confirmation information for the LTM cell handover command, where N6 is a positive integer. N6 can be configured by the network device or defined by the protocol.

[0411] For example, Where μ is the subcarrier spacing configuration, This represents the number of time slots in the subframe. For the corresponding subcarrier spacing configuration, k mac Configured by higher-level signaling.

[0412] Referring to Figure 8, which is another timing diagram according to some embodiments.

[0413] In Figure 8, t1 represents the first time sub-unit of the time unit used to transmit the second information, t2 represents the first time sub-unit of the start time unit of the first CSI-RS resource, and t3 represents the last time sub-unit of the time unit used to send the CSI report. The time interval between t1 and t2 is greater than or equal to Y time sub-units, and / or the time interval between t2 and t3 is greater than or equal to Y' time sub-units.

[0414] For more details regarding the above, please refer to the relevant descriptions of other embodiments in this document, which will not be repeated here.

[0415] In some embodiments, considering the capabilities of the terminal device, the terminal device does not expect to have more active CSI-RS resource ports or active CSI-RS resources than it can handle within any given time unit. Therefore, in some embodiments of this disclosure, limiting the ports and / or activation time periods of CSI-RS resources helps ensure that CSI measurements are performed within the capabilities of the terminal device and minimizes the computational overhead of the terminal device.

[0416] In some embodiments, CSI measurement begins before receiving the LTM cell handover command, and the first CSI-RS resource and / or the port of the first CSI-RS resource are in an active state between the last time sub-unit of the seventh time unit and the last time sub-unit of the eighth time unit. "In an active state" means that during this time period, it is considered that the terminal device needs to allocate its own power consumption, computing power, resources, etc. to track, receive, measure, etc. of the first CSI-RS resource.

[0417] For example, the first CSI-RS resource is an aperiodic resource, and the seventh time unit can be a time unit for transmitting a resource trigger command, which is used to trigger the first CSI-RS resource. For example, for a terminal device, the "time unit for transmitting the resource trigger command" is the "time unit for receiving the resource trigger command," and for a network device, the "time unit for transmitting the resource trigger command" is the "time unit for sending the resource trigger command." Further, the eighth time unit can be at least one of the following: a time unit for transmitting an LTM cell handover command, a time unit for transmitting confirmation information for an LTM cell handover command, a time unit for transmitting first information, a time unit for transmitting confirmation information for the first information, and a time unit for transmitting a CSI report. The "time unit for transmitting the resource trigger command" can also be replaced with the "time unit for transmitting DCI." As mentioned above, DCI can refer to triggering an aperiodic CSI report or the first CSI-RS resource.

[0418] For example, if the first CSI-RS resource is a periodic resource, the seventh time unit can be a time unit used for transmitting resource configuration information. As mentioned above, the resource configuration information can be used to configure the first CSI-RS resource. For example, for a terminal device, the "time unit used for transmitting resource configuration information" is the "time unit used for receiving resource configuration information," and for a network device, the "time unit used for transmitting resource configuration information" is the "time unit used for sending resource configuration information." Further, the eighth time unit can be at least one of the following: a time unit used for transmitting LTM cell handover commands, a time unit used for transmitting confirmation information for LTM cell handover commands, a time unit used for transmitting first information, a time unit used for transmitting confirmation information for the first information, a time unit used for transmitting CSI reports, and a time unit for the end of CSI measurements. Regarding the "time unit for the end of CSI measurements," please refer to the relevant description above concerning the embodiment shown in Figure 2.

[0419] For example, if the first CSI-RS resource is a semi-persistent resource, the seventh time unit can be the time unit when the resource activation command takes effect. Further, the eighth time unit can be at least one of the following: a time unit for transmitting LTM cell handover commands, a time unit for transmitting confirmation information for LTM cell handover commands, a time unit for transmitting first information, a time unit for transmitting confirmation information for the first information, a time unit for transmitting CSI reports, and a time unit for the end of CSI measurements. Regarding the "end of CSI measurements time unit," please refer to the relevant description above concerning the embodiment shown in Figure 2.

[0420] In other embodiments, CSI measurement begins after receiving an LTM cell handover command, and the first CSI-RS resource and / or the port of the first CSI-RS resource are active between the ninth and tenth time units.

[0421] For example, the first CSI-RS resource is an aperiodic resource, the tenth time unit can be a time unit for transmitting CSI reports, and the ninth time unit can be at least one of the following: a time unit for transmitting LTM cell handover commands, a time unit for transmitting confirmation information of LTM cell handover commands, a time unit for transmitting first information, a time unit for transmitting confirmation information of the first information, the N7th time unit after the time unit for transmitting confirmation information of LTM cell handover commands, a time unit for pre-configuration information to take effect, and / or a time unit for the TCI status of the target cell carried by the LTM cell handover command to take effect, and a time unit for transmitting resource configuration information on the original cell, or a time unit for resource configuration information to take effect. In some embodiments of this disclosure, the resource configuration information is transmitted on the original cell.

[0422] For example, if the first CSI-RS resource is a periodic or semi-persistent resource, the tenth time unit is used for transmitting CSI reports or for the end of CSI measurements. When the first CSI-RS resource is a periodic resource, the tenth time unit can also be the time when the terminal device receives release information for the first CSI-RS resource in the target cell, or the time when the release information for the first CSI-RS resource received by the terminal device in the target cell takes effect, or the time when the terminal device receives reconfiguration information for the first CSI-RS resource in the target cell, or the time when the reconfiguration information for the first CSI-RS resource received by the terminal device in the target cell takes effect. When the first CSI-RS resource is a semi-persistent resource, the tenth time unit can be the time when the terminal device receives a deactivation command for the first CSI-RS resource in the target cell, or the time when the deactivation command for the first CSI-RS resource received by the terminal device in the target cell takes effect.

[0423] Further, the first CSI-RS resource is a periodic resource or a semi-persistent resource, and the ninth time unit can be at least one of the following: a time unit for transmitting LTM cell handover commands, a time unit for transmitting confirmation information of LTM cell handover commands, a time unit for transmitting first information, a time unit for transmitting confirmation information of the first information, the N7th time unit after the time unit for transmitting confirmation information of LTM cell handover commands, a time unit for pre-configuration information to take effect and / or a time unit for the TCI status of the target cell carried by the LTM cell handover command to take effect, a time unit for transmitting resource configuration information, a time unit for resource configuration information to take effect, a time unit for transmitting resource activation commands, a time unit for transmitting confirmation information of resource activation commands, the M4th time unit after transmitting resource activation commands, and the M5th time unit after transmitting confirmation information of resource activation commands. In some embodiments of this disclosure, the resource configuration information and the resource activation command are transmitted on the original cell. N7, M4, and M5 are all positive integers. N7, M4, and M5 can be configured by network devices or defined by protocols.

[0424] For example, For example, For example, Where μ is the subcarrier spacing configuration, This represents the number of time slots in the subframe. For the corresponding subcarrier spacing configuration, k mac Configured by higher-level signaling.

[0425] The meaning of each time unit in some embodiments of this disclosure can be found in the descriptions of the various embodiments above, and will not be repeated here.

[0426] For more details on the above embodiments, please refer to the relevant descriptions of other embodiments in this document, which will not be repeated here.

[0427] In some embodiments, the temporal location of the CSI reference resource used for CSI reporting is defined. The CSI reference resource used for CSI reporting can be used to determine measurement resources. For example, the measurement resource corresponding to the CSI report may be located before the CSI reference resource. The measurement resource corresponding to the CSI report may be the resource actually used for measurement within the first CSI-RS resource associated with the CSI report.

[0428] Referring to Figure 9, which is another timing diagram according to some embodiments, in Figure 9, t report Indicates the time unit used to send the CSI report, t ref This represents the time unit of the CSI reference resource. For example, in t report The CSI report sent on the platform is based on t ref The measurements were generated from the previous first CSI-RS resource.

[0429] In some embodiments, the time unit in which the CSI reference resource for the CSI report is located is determined based on the time unit of the uplink channel resource carrying the CSI report. "Time unit of uplink channel resource carrying the CSI report" can be replaced with "Time unit for sending the CSI report".

[0430] When the time unit of the uplink channel resource carrying the CSI report is time slot n', the time unit number of the CSI reference resource used for the CSI report can be:

[0431] Where n is determined by the following formula, K offset Configured by high-level signaling, K represents the frequency range 1 (FR1). offset The subcarrier spacing when μ is 0 DL This indicates the downlink subcarrier spacing.

[0432] Where, μ UL Indicates the uplink subcarrier spacing. and Configured by higher-level signaling.

[0433] In other embodiments, CSI measurements begin before receiving the LTM cell handover command. The time unit containing the CSI reference resource used for CSI reporting can be the eleventh time unit or the Pth time unit preceding the eleventh time unit, where P is a positive integer. P can be configured by the network device or defined by the protocol. For example, P=1, or P=2, etc. The eleventh time unit satisfies any of the following:

[0434] (A″) The eleventh time unit is used to transmit LTM cell handover commands. The details of the "time unit used to transmit LTM cell handover commands" can be found in the relevant description above and will not be repeated here.

[0435] B″), the eleventh time unit is used to transmit confirmation information for LTM cell handover commands. The details of the "time unit used to transmit confirmation information for LTM cell handover commands" can be found in the relevant description above and will not be repeated here.

[0436] C″), the eleventh time unit is the N8th time unit after the time unit used to transmit the confirmation information of the LTM cell handover command, where N8 is a positive integer.

[0437] For example, Where μ is the subcarrier spacing configuration, This represents the number of time slots in the subframe. For k mac Subcarrier spacing configuration, k mac Configured by network devices.

[0438] D″), the eleventh time unit is the time unit when the pre-configuration information takes effect and / or the time unit when the TCI status of the target cell carried in the LTM cell handover command takes effect. For details regarding the "time unit when the pre-configuration information takes effect and / or the time unit when the TCI status of the target cell carried in the LTM cell handover command takes effect," please refer to the relevant description above; it will not be repeated here.

[0439] For more details on the above embodiments, please refer to the relevant descriptions of other embodiments in this document, which will not be repeated here.

[0440] In some embodiments, the source cell is configured as multiple Transmission and Receiving Points (TRPs). For example, the network device indicates multiple TCI states of the source cell to the terminal device, or the network device configures multiple Control Resource Set Pools (CORESET Pools) for the terminal device. For example, the network device indicates two TCI states of the source cell, or the network device configures CORESET Pools with indices 0 and 1, in which case the source cell includes two TRPs. "The source cell is configured as multiple TRPs" can be equivalent to "The source cell belongs to multiple TRPs or the source cell includes multiple TRPs." In this case, the target cell can also be configured as a single TRP, or the target cell can also be configured as multiple TRPs.

[0441] Referring to FIG10, FIG10 is a signaling interaction diagram of another communication method according to some embodiments. The method shown in FIG10 may include: S101, S102, S103 and S104.

[0442] In S101, the terminal device detects LTM events.

[0443] LTM events can be used to trigger Layer 1 measurement reporting. For example, a terminal device can perform beam measurement to obtain Layer 1 measurement results. Upon detecting an LTM event, the terminal device can send a Layer 1 measurement report to the network device.

[0444] For example, an LTM event can be any of the following:

[0445] Event 1: The beam quality of the serving cell is less than the first threshold.

[0446] Event 2: The beam quality of the candidate cell is greater than that of the serving cell, and the difference between the beam quality of the candidate cell and the serving cell is greater than or equal to the second threshold.

[0447] Event 3: The beam quality of the candidate cell is greater than the third threshold.

[0448] Event 4: The beam quality of the serving cell is less than the fourth threshold, while the beam quality of the candidate cell is greater than the fifth threshold.

[0449] In some embodiments, since the original cell is configured as multiple TRPs, the terminal device uses multiple beams (i.e., multiple TCI states of the original cell indicated by the network device) to communicate with the multiple TRPs of the original cell respectively.

[0450] It should be noted that a beam is a communication resource, and network devices and terminal devices can transmit and receive signals through beams. The beam in the embodiments of this disclosure can be a wide beam, a narrow beam, or other types of beams.

[0451] In communication protocols, beams can be described as spatial relations, spatial domain filters, spatial filters, spatial parameters, spatial domain parameters, transmission configuration indication (TCI) status, quasi-co-location (QCL) parameters, etc. This article uses the term "beam," but "beam" can be understood as other equivalent concepts, and is not limited to those mentioned above.

[0452] In some embodiments, when a terminal device detects an LTM event in the original cell, it needs to determine the beam quality of the original cell. The beam quality of the original cell can be the beam measurement result of the current beam of the original cell. For example, the beam measurement result can be at least one of the following: Layer 1 Reference Signal Receiving Power (L1-RSRP), Reference Signal Receiving Quality (RSRQ), Signal-to-Interference Plus Noise Ratio (SINR), Signal-to-Noise Ratio (SNR), Channel Quality Indicator (CQI), and Received Signal Strength Indication (RSSI), etc.

[0453] The current beam of the original cell can be determined based on the first TCI state. "Determining the current beam based on the first TCI state" means using the quasi-co-location (QCL) source reference signal (RS) in the first TCI state as the source RS of the current beam, or using the SSB that has a QCL relationship with the QCL source RS in the first TCI state as the source RS of the current beam.

[0454] In some embodiments, the first TCI state can be any of the following:

[0455] • The first TCI state among multiple TCI states of the original cell indicated by the network device. The "first TCI state" can refer to the TCI state with the smallest index value.

[0456] • The TCI state corresponding to the CORESET Pool with index 0;

[0457] • The TCI state with the largest beam measurement result among the multiple TCI states of the original cell indicated by the network device;

[0458] • The TCI state with the smallest beam measurement result among the multiple TCI states of the original cell indicated by the network device.

[0459] In other embodiments, the multiple TCI states of the original cell indicated by the network device are all the same first TCI state. In other words, the original cell has multiple current beams, and the beam quality of the original cell can be determined based on the beam quality results of multiple current beams. For example, the beam quality of the original cell can be the average of the beam quality results of multiple current beams.

[0460] In S102, the terminal device sends a Layer 1 measurement report to the network device. Correspondingly, the network device receives the Layer 1 measurement report. For example, the terminal device sends a Layer 1 measurement report to the network device upon detecting an LTM event. The Layer 1 measurement report in S102 is the same as the Layer 1 measurement report in S16 of Figure 1.

[0461] Layer 1 measurement reports may include: beam quality of the original cell and / or beam quality of the candidate cell.

[0462] In some embodiments, the Layer 1 measurement report can be a group-based beam report. For example, the Layer 1 measurement report may include indication information of beam pairs for each candidate cell whose measurement results satisfy an LTM event. A beam pair includes multiple beams used for simultaneous uplink transmission or simultaneous downlink reception. For example, the beam pair indication information may be a pair of SSB Resource Indicators (SSBRIs), or it may be a pair of CSI-RS Resource Indicators (CRIs). The network device can determine multiple TCI states of the candidate cells based on the beam pair indication information.

[0463] Alternatively, the Layer 1 measurement report can be a non-group-based beam report. For example, a Layer 1 measurement report may include multiple beam indication information for candidate cells whose measurement results satisfy the LTM event; the beam indication information may be SSBRI or CRI. Furthermore, the Layer 1 measurement report may also include TCI status indication information, which can be used to indicate the TRP of the candidate cell corresponding to each beam indication information, such as the first or second TCI status of the corresponding candidate cell, or the CORESET Pool with index 0 or index 1.

[0464] In S103, the network device sends an LTM cell handover command to the terminal device.

[0465] LTM cell handover commands can include multiple TCI states of the target cell. The TCI states of the target cell can correspond one-to-one with the TRP of the target cell. For example, the number of TCI states indicated by the LTM cell handover command may be the same as or different from the number of TCI states of the original cell.

[0466] In S104, the terminal device sends a CSI report to the network device.

[0467] In some embodiments, the CSI report may include CSI reports for multiple TRPs of the target cell. For example, the network device may configure CSI report configurations for multiple TRPs of the target cell for the terminal device (e.g., multiple TRPs may have their own CSI report configurations, or multiple TRPs may have a common CSI report configuration), and a first CSI-RS resource associated with the CSI report configuration. Further, the terminal device may send the CSI reports for the multiple TRPs of the target cell to the network device. The CSI report is obtained by performing CSI measurements based on the first CSI-RS resource associated with the CSI report configuration, and the first CSI-RS resource contains the CSI-RS resource for each TRP.

[0468] For example, the CSI-RS resource set associated with the CSI report of the target cell may include multiple CSI-RS resource groups, each corresponding to a different TCI state indicated by the LTM cell handover command. That is, a CSI-RS resource group can correspond one-to-one with a TCI state indicated by the LTM cell handover command. In other words, a CSI-RS resource group can correspond one-to-one with a TRP of the target cell. For example, each CSI-RS resource group is used for CSI measurements of the TRP corresponding to that CSI-RS resource group. For example, for each CSI-RS resource group, the terminal device can use the TCI state corresponding to that CSI-RS resource group to determine the QCL parameters, and based on the determined QCL parameters, receive CSI-RS on the resources in that CSI-RS resource group and perform CSI measurements, thereby obtaining the CSI report of the TRP corresponding to that CSI-RS resource group.

[0469] In other embodiments, the LTM cell handover command may include one or more TCI states of the target cell, but the network device may instruct only the TRP to report the CSI report corresponding to one of the TCI states. In this case, the terminal device communicates only with a single TRP after performing the cell handover.

[0470] In some embodiments, the network device may instruct only the reporting of CSI reports for target TRPs, and the number of target TRPs may be one or more.

[0471] For example, the first piece of information mentioned above may include indication information of the target TRP. For instance, the indication information of the target TRP may be the identifier of the target TRP, the TCI status identifier corresponding to the target TRP, or the CORESET Pool index corresponding to the target TRP. Correspondingly, the terminal device may only report the CSI report of the target TRP.

[0472] For example, a network device may configure only the first CSI-RS resource of the target TRP, or a network device may activate only the first CSI-RS resource of the target TRP, or a network device may trigger only the first CSI-RS resource of the target TRP.

[0473] For example, the CSI-RS resource set configured in the resource configuration information includes multiple CSI-RS resource groups. As described above, the network device sends first information to the terminal device to instruct the terminal device to report the CSI of the target cell. The first information may include the identifier of the target CSI-RS resource group. The terminal device can perform CSI measurements on the CSI-RS resources in the target CSI-RS resource group to obtain the CSI report of the TRP corresponding to the target CSI-RS resource group.

[0474] For example, an LTM cell handover command may include multiple TCI states of the target cell, and may also include target indication information. Target indication information can be used to indicate the CORESET Pool index or target TCI state corresponding to the target TRP. Thus, the terminal device can perform CSI measurements only on the target TRP to obtain a CSI report for the target TRP. As an example, an LTM cell handover command may also not include target indication information, and the terminal device may implicitly determine the target TRP or target TCI state. For example, the target TCI state may be the first TCI state among multiple TCI states of the target cell carried in the LTM cell handover command.

[0475] For example, if the CSR-RS resources in the CSI-RS resource set associated with the CSI report of the target cell are not grouped, the terminal device can first determine the target TCI state. For instance, the terminal device can determine the target TCI state based on target indication information, or implicitly determine the target TCI state (e.g., the target TCI state could be the first or last TCI state among multiple TCI states of the target cell carried in the LTM cell handover command). Further, the terminal device can determine the QCL parameters based on the target TCI state, and based on the determined QCL parameters, receive CSI-RS on the CSR-RS resources in the CSI-RS resource set and perform CSI measurements, thereby obtaining the CSI report of the TRP corresponding to the target TCI state.

[0476] For more details on the above embodiments, please refer to the relevant descriptions of other embodiments in this document, which will not be repeated here.

[0477] This disclosure also provides a communication method in some embodiments.

[0478] Referring to FIG11, FIG11 is a flowchart of a communication method according to some embodiments. The communication method shown in FIG11 can be applied to a terminal device, and the communication method shown in FIG11 may include S111, S112 and S113.

[0479] In S111, LTM cell handover commands are received.

[0480] In S112, in response to the LTM cell handover command, the cell is switched from the original cell to the target cell.

[0481] In S113, a CSI report is sent to the target cell. The CSI report is obtained by performing CSI measurements on the target cell; the CSI measurement begins before receiving the LTM cell handover command, or the CSI measurement is performed after receiving the LTM cell handover command.

[0482] As mentioned above, the LTM cell handover command may include a TCI state, which can be used to communicate with the target cell after handover. For example, a terminal device can use the TCI state carried by the LTM cell handover command to receive CSI-RS on the first CSI-RS resource.

[0483] In some embodiments, the terminal device begins CSI measurement before receiving an LTM cell handover command. Before receiving the LTM cell handover command, the terminal device can receive CSI-RS using the TCI state configured in the resource configuration information. The resource configuration information is used to configure the first CSI-RS resource. Further, after receiving the cell handover command, if the terminal device is still performing CSI measurement, the terminal device can continue to use the TCI state configured in the resource configuration information to receive CSI-RS, or the terminal device can switch to the TCI state carried in the LTM cell handover command to receive CSI-RS.

[0484] In other embodiments, the terminal device initiates CSI measurements before receiving the LTM cell handover command. The terminal device can receive CSI-RS using the TCI state configured with the resource configuration information described above, or it can receive CSI-RS using the TCI state carried in the LTM cell handover command.

[0485] In some embodiments, in response to a scheduling offset less than a beam switching time threshold, the CSI-RS on the first CSI-RS resource is received using default QCL information. The default QCL information is the QCL information of either the SSB resource or the second CSI-RS resource, which is used for beam measurement of the target cell. For example, the terminal device performs beam measurement on the SSB resource or the second CSI-RS resource configured on the target cell in the original cell to determine the beam quality of that cell. The beam switching time threshold can be configured by the network device or defined by the protocol.

[0486] For example, if the first CSI-RS resource is an aperiodic resource, and the scheduling offset is less than the beam switching time threshold, the terminal device uses the default QCL information to receive CSI-RS on the first CSI-RS resource. The scheduling offset can be the offset between any of the following time sub-units (i.e., the start time of the scheduling offset) and the first time sub-unit of the first CSI-RS resource:

[0487] • The last time sub-unit of the time unit used to receive LTM cell handover commands;

[0488] • The last time sub-unit of the time unit used to send confirmation information for LTM cell handover commands;

[0489] • The last time sub-unit used to receive the first information;

[0490] • The last time sub-unit of the time unit used to send the confirmation message for the first message;

[0491] • The last time sub-unit of the N3rd time unit after the time unit used to send the confirmation information for the LTM cell handover command, where N3 is a positive integer;

[0492] For example,

[0493] Where μ is the subcarrier spacing configuration, This represents the number of time slots in the subframe. For k mac Subcarrier spacing configuration, k mac Configured by network devices;

[0494] • The last time sub-unit of the time unit in which the pre-configuration information takes effect and / or the last time sub-unit of the time unit in which the TCI status of the target cell carried by the LTM cell handover command takes effect.

[0495] The contents of "time unit for receiving LTM cell handover command", "confirmation information for sending LTM cell handover command", "confirmation information for sending LTM cell handover command", "time unit for receiving first information", "time unit for sending first information confirmation information", "time unit for pre-configuration information to take effect", and "time unit for the target cell TCI status carried by LTM cell handover command to take effect" can be referred to the description above and will not be repeated here.

[0496] For more details on the above embodiments, please refer to the relevant descriptions of other embodiments in this document, which will not be repeated here.

[0497] It should be noted that the various embodiments, possible implementation methods, possible methods of implementation, various examples, and solutions in various situations provided in this article can be used individually or in combination to achieve different technical effects.

[0498] It is understandable that, in practice, the above method can be implemented using a software program that runs in the processor integrated inside the chip or chip module; or, the method can be implemented using hardware or a combination of hardware and software, such as using a dedicated chip or chip module, or using a dedicated chip or chip module combined with a software program.

[0499] This disclosure also provides a communication device in some embodiments.

[0500] Referring to FIG12, FIG12 is a block diagram of a communication device according to some embodiments. The communication device shown in FIG12 can be deployed on a terminal device. The device shown in FIG12 may include: a receiving module 121, a processing module 122, and a transmitting module 123.

[0501] The receiving module 121 is used to receive the mobility (LTM) cell handover command triggered by Layer 1 / Layer 2.

[0502] The processing module 122 is used to respond to the LTM cell handover command and switch from the original cell to the target cell.

[0503] The transmitting module 123 is used to transmit a Channel State Information (CSI) report in the target cell. The CSI report is obtained based on the CSI measurement of the first CSI-RS resource of the Channel State Information Reference Signal of the target cell.

[0504] CSI measurements can begin before receiving an LTM cell handover command, or CSI measurements can be performed after receiving an LTM cell handover command.

[0505] In some embodiments, the communication device shown in FIG12 may correspond to a chip with communication function in a terminal device; or to a terminal device including a chip or chip module with communication function, or to a terminal device.

[0506] This disclosure also provides a communication device in some embodiments.

[0507] Referring to FIG13, which is a block diagram of another communication device according to some embodiments, the communication device shown in FIG13 can be deployed in a network device. The device shown in FIG13 may include a transmitting module 131 and a receiving module 132.

[0508] The transmitting module 131 is used to transmit a Layer 1 / Layer 2 triggered Mobility Module (LTM) cell handover command. The LTM cell handover command is used to trigger a handover from the original cell to the target cell.

[0509] The receiving module 132 is used to receive the Channel State Information (CSI) report of the target cell. The CSI report is obtained by performing CSI measurements on the target cell.

[0510] CSI measurements can begin before the LTM cell handover command is sent, or CSI measurements can be performed after the LTM cell handover command is sent.

[0511] In some embodiments, the communication device shown in FIG13 may correspond to a chip with communication function in a network device; or to a network device including a chip or chip module with communication function, or to a network device.

[0512] The working principle, working method, and beneficial effects of the communication device in the embodiments of this disclosure can be referred to the relevant description of the method above, and will not be repeated here.

[0513] Some embodiments of this disclosure also provide a computer-readable storage medium (such as a non-transitory computer-readable storage medium) on which a computer program is stored. When the computer program is run by a computer, the above-described method is executed. The storage medium may include read-only memory (ROM), random access memory (RAM), a magnetic disk, or an optical disk, etc. The storage medium may also include non-volatile memory or non-transitory memory, etc.

[0514] Some embodiments of this disclosure also provide a communication device. The communication device includes a memory and a processor. The memory stores a computer program that can run on the processor, and when the processor runs the computer program, it performs the steps of the method described above. The communication device can be a terminal device, or it can be a network device, wherein the terminal device can be a mobile phone, computer, tablet computer, vehicle terminal, wearable device, etc., but this disclosure is not limited thereto.

[0515] Referring to Figure 14, which is a schematic diagram of the hardware structure of a communication device according to some embodiments. The communication device shown in Figure 14 can be the terminal device described above, or the network device described above. The communication device shown in Figure 14 includes a memory 141, a processor 142, and a transceiver 143. The processor 142 is coupled to the memory 141 and the transceiver 143. The memory 141 can be located inside or outside the communication device. The memory 141, the processor 142, and the transceiver 143 can be connected via a communication bus. The transceiver 143 is used to communicate with other devices.

[0516] In some embodiments, transceiver 143 may be a transmitter or a receiver. Memory 141 stores a computer program that can run on processor 142. When processor 142 runs the computer program, it performs the steps in the methods provided in the above embodiments, and / or, when processor 142 runs the computer program, transceiver 143 performs the steps in the methods provided in the above embodiments.

[0517] It should be understood that in this embodiment, the processor 142 can be a Central Processing Unit (CPU), but it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0518] It should also be understood that the memory in the embodiments of this disclosure may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Non-volatile memory may be ROM, Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), or flash memory. Volatile memory may be Random Access Memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous DRAM (SDRAM), Double Data Rate Synchronous DRAM (DDR SDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DR RAM).

[0519] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of this disclosure are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, a computer program can be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means.

[0520] It should be understood that in the various embodiments of this disclosure, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this disclosure.

[0521] In the several embodiments provided in this disclosure, it should be understood that the disclosed methods, apparatuses, and systems can be implemented in other ways. For example, the apparatus embodiments described above are merely examples; for example, the division of units is merely a logical functional division, and there may be other division methods in actual implementation; for example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0522] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the objectives of some embodiments of this disclosure, depending on actual needs.

[0523] Furthermore, the functional units in the various embodiments of this disclosure can be integrated into one processing unit, or each unit can be physically included separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or in a combination of hardware and software functional units. For example, for various devices or products applied to or integrated into a chip, each module / unit can be implemented using hardware such as circuits, or at least some modules / units can be implemented using software programs running on a processor integrated within the chip, while the remaining (if any) modules / units can be implemented using hardware such as circuits; for various devices or products applied to or integrated into a chip module, each module / unit can be implemented using hardware such as circuits, and different modules / units can be located in the same component (e.g., chip, circuit module, etc.) or different components of the chip module, or at least some modules / units can be implemented using hardware such as circuits. The components can be implemented using software programs that run on the processor integrated within the chip module. The remaining (if any) modules / units can be implemented using hardware methods such as circuits. For various devices and products applied to or integrated into the terminal, each of its components / units can be implemented using hardware methods such as circuits. Different modules / units can be located in the same component (e.g., chip, circuit module, etc.) or in different components within the terminal. Alternatively, at least some modules / units can be implemented using software programs that run on the processor integrated within the terminal, while the remaining (if any) modules / units can be implemented using hardware methods such as circuits.

[0524] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute some steps of the methods described in the various embodiments of this disclosure. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, random access memory (RAM), magnetic disks, or optical disks.

[0525] It should be understood that the term "and / or" in this article 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 existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article indicates that the preceding and following related objects have an "or" relationship.

[0526] In this disclosure, "multiple" refers to two or more.

[0527] In this disclosure, "equal to" can be used with "less than" or "greater than", but not simultaneously with both. When "equal to" is used with "less than", it applies to the technical solution adopted by "less than". When "equal to" is used with "greater than", it applies to the technical solution adopted by "greater than".

[0528] The descriptions of "first," "second," etc., appearing in the embodiments of this disclosure are for illustrative purposes and to distinguish the objects being described. They have no order and do not indicate any particular limitation on the number of devices in the embodiments of this disclosure, nor do they constitute any limitation on the embodiments of this disclosure.

[0529] While the above disclosure is provided, it is not limited thereto. Any person skilled in the art may make various alterations and modifications without departing from the spirit and scope of this disclosure; therefore, the scope of protection of this disclosure shall be determined by the scope defined in the claims.

Claims

1. A communication method, comprising: Receive Layer 1 / Layer 2 triggered Mobility TM (LTM) cell handover commands; In response to the LTM cell handover command, the cell is switched from the original cell to the target cell; The target cell transmits a Channel State Information (CSI) report, wherein the CSI report is obtained by performing CSI measurements on the target cell; The CSI measurement may begin before receiving the LTM cell handover command, or the CSI measurement may be performed after receiving the LTM cell handover command.

2. The communication method according to claim 1, wherein, The CSI measurement begins before the LTM cell handover command is received, the CSI measurement begins in the first time unit, or the CSI measurement begins after the first time unit. Wherein, the first time unit satisfies at least one of the following: The first time unit is used to receive resource configuration information, or the first time unit is the time unit when the resource configuration information takes effect. The resource configuration information is used to configure a first channel state information reference signal (CSI-RS) resource. The first CSI-RS resource is associated with the CSI report, and the first CSI-RS resource is a periodic resource. The first time unit is used to receive a resource activation command, which is used to activate the first CSI-RS resource. The first CSI-RS resource is associated with the CSI report and is a semi-persistent resource. The first time unit is the M1th time unit after the time unit used to send the confirmation information of the resource activation command, where M1 is a positive integer. The resource activation command is used to activate the first CSI-RS resource, which is associated with the CSI report and is the semi-persistent resource. The first time unit is used to receive first information, or the first time unit is used to send confirmation information of the first information, wherein the first information is at least used to instruct the reporting of the CSI report, the CSI report being associated with the first CSI-RS resource, and the first CSI-RS resource being the periodic resource or the semi-persistent resource; and The first time unit is used to receive downlink control information (DCI), the DCI is used to trigger the CSI report, the CSI report is associated with the first CSI-RS resource, the first CSI-RS resource is an aperiodic resource, and the time interval between the first time unit and the time unit of the first CSI-RS resource is a first offset.

3. The communication method according to claim 1 or 2, wherein, The CSI measurement begins before the LTM cell handover command is received, the CSI report is associated with the first CSI-RS resource, and the CSI measurement ends at the second time unit or the CSI measurement ends L time units before the second time unit, where L is a positive integer. Wherein, the second time unit satisfies at least one of the following: The second time unit is used to receive the LTM cell handover command, and the first CSI-RS resource is a periodic resource or a semi-persistent resource; The second time unit is used to send confirmation information for the LTM cell handover command, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the N1th time unit after the time unit used to send the confirmation information of the LTM cell handover command, where N1 is a positive integer, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit when the pre-configuration information takes effect and / or the time unit when the transmission configuration indication (TCI) status of the target cell carried by the LTM cell handover command takes effect. The pre-configuration information is used to configure the cell parameters of the target cell. The first CSI-RS resource is the periodic resource or the semi-persistent resource. The second time unit is used to send the CSI report, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit in which a random access response is received in the target cell, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit for sending message 3 in the target cell, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit for sending a Radio Resource Control (RRC) reconfiguration completion message in the target cell, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit when the network scheduling signaling is first received after the target cell completes the RRC reconfiguration. The network scheduling signaling is used to schedule uplink transmission and / or downlink reception. The first CSI-RS resource is the periodic resource or the semi-persistent resource. The second time unit is the time unit in which the release information of the first CSI-RS resource is received in the target cell, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit in which the reconfiguration information of the first CSI-RS resource is received in the target cell, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit in which the release information of the first CSI-RS resource received in the target cell takes effect, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit in which the reconfiguration information of the first CSI-RS resource received in the target cell takes effect, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit in which the deactivation command of the first CSI-RS resource is received in the target cell, and the first CSI-RS resource is the semi-persistent resource; The second time unit is the M2th time unit after the time unit used to send confirmation information for the deactivation command of the first CSI-RS resource in the target cell, where M2 is a positive integer, and the first CSI-RS resource is the semi-persistent resource; and By the second time unit, the number of CSI-RS transmissions on the first CSI-RS resource has reached K1 times, where K1 is a positive integer, and the first CSI-RS resource is the periodic resource or the semi-persistent resource.

4. The communication method according to claim 1, wherein, The CSI measurement is performed after receiving the LTM cell handover command, and the CSI measurement begins at or after the third time unit. Wherein, the third time unit satisfies at least one of the following: The third time unit is used to receive the LTM cell handover command; The third time unit is used to send confirmation information for the LTM cell handover command; The third time unit is the N2th time unit after the time unit used to send the confirmation information of the LTM cell handover command, where N2 is a positive integer; The third time unit is the time unit when the pre-configuration information takes effect and / or the time unit when the TCI status of the target cell is carried by the LTM cell handover command. The pre-configuration information is used to configure the cell parameters of the target cell. The third time unit is used to receive first information, or the third time unit is used to send confirmation information of the first information, wherein the first information is at least used to instruct the reporting of the CSI report, the CSI report being associated with a first CSI-RS resource, and the first CSI-RS resource being a periodic resource or a semi-persistent resource; and The third time unit is used to receive second information, which is used to trigger the CSI report. The CSI report is associated with the first CSI-RS resource, which is an aperiodic resource. The time interval between the third time unit and the time unit of the first CSI-RS resource is the second offset.

5. The communication method according to claim 1 or 4, wherein, The CSI measurement is performed after receiving the LTM cell handover command. The CSI report is associated with the first CSI-RS resource. The CSI measurement ends at the fourth time unit or the CSI measurement ends Q time units before the fourth time unit, where Q is a positive integer. Wherein, the fourth time unit satisfies at least one of the following: The fourth time unit is used to send the CSI report, and the first CSI-RS resource is a periodic resource or a semi-persistent resource. The fourth time unit is the time unit in which a random access response is received in the target cell, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The fourth time unit is the time unit for sending message 3 in the target cell, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The fourth time unit is the time unit in which the RRC reconfiguration completion message is sent in the target cell, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The fourth time unit is the time unit at which network scheduling signaling is first received after the target cell completes RRC reconfiguration. The network scheduling signaling is used to schedule uplink transmission and / or downlink reception. The first CSI-RS resource is the periodic resource or the semi-persistent resource. The fourth time unit is the time unit when the target cell receives the release information of the first CSI-RS resource, or the fourth time unit is the time unit when the target cell receives the reconfiguration information of the first CSI-RS resource, where the first CSI-RS resource is the periodic resource or the semi-persistent resource. The fourth time unit is the time unit when the release information of the first CSI-RS resource received in the target cell takes effect, or the fourth time unit is the time unit when the reconfiguration information of the first CSI-RS resource received in the target cell takes effect, wherein the first CSI-RS resource is the periodic resource or the semi-persistent resource. The fourth time unit is the time unit in which the deactivation command of the first CSI-RS resource is received in the target cell, and the first CSI-RS resource is the semi-persistent resource; The fourth time unit is the M3rd time unit after the time unit used to send the confirmation information of the deactivation command of the first CSI-RS resource in the target cell, where M3 is a positive integer, and the first CSI-RS resource is the semi-persistent resource; and By the fourth time unit, the number of CSI-RS transmissions on the first CSI-RS resource has reached K2 times, where K2 is a positive integer, and the first CSI-RS resource is the periodic resource or the semi-persistent resource.

6. The communication method according to any one of claims 1 to 5, further comprising: In response to a scheduling offset less than a beam switching time threshold, the default quasi-co-location (QCL) information is applied to receive the CSI-RS on the first CSI-RS resource, which is associated with the CSI report. The default QCL information is either the QCL information of the Synchronization Signal Block (SSB) resource or the QCL information of the second CSI-RS resource, which is used to perform beam measurement on the target cell. The start time of the scheduling offset is any one of the following: The last time subunit of the time unit used to receive the LTM cell handover command; The last time sub-unit of the time unit used to send the confirmation information for the LTM cell handover command; The last time sub-unit of the time unit used to receive the first information, which is at least used to indicate the reporting of the CSI report; The last time sub-unit of the time unit used to send confirmation information for the first information, wherein the first information is at least used to indicate the reporting of the CSI report; The last time sub-unit of the N3rd time unit following the time unit used to send the confirmation information for the LTM cell handover command, where N3 is a positive integer; and The last time sub-unit of the time unit in which the pre-configuration information takes effect and / or the last time sub-unit of the time unit in which the TCI status of the target cell carried by the LTM cell handover command takes effect, wherein the pre-configuration information is used to configure the cell parameters of the target cell.

7. The communication method according to any one of claims 1 to 6, wherein, The CSI report is sent in or after the fifth time unit, the fifth time unit being used to receive the first information or to send confirmation information of the first information, the first information being used at least to instruct the reporting of the CSI report.

8. The communication method according to any one of claims 1 to 6, wherein, The CSI report is a periodic report or a semi-continuous report, and the CSI report is sent in or after the sixth time unit; The sixth time unit satisfies at least one of the following: The sixth time unit is used to receive the LTM cell handover command; The sixth time unit is used to send confirmation information for the LTM cell handover command; The sixth time unit is the N4th time unit after the time unit used to send the confirmation information for the LTM cell handover command, where N4 is a positive integer; and The sixth time unit is the time unit when the pre-configuration information takes effect and / or the time unit when the TCI status of the target cell carried by the LTM cell handover command takes effect. The pre-configuration information is used to configure the cell parameters of the target cell.

9. The communication method according to any one of claims 1 to 8, wherein, The CSI report is a periodic report or a semi-continuous report, and the method further includes: In response to the condition for stopping transmission being met, the transmission of the CSI report is stopped; The conditions for stopping transmission include at least one of the following: The CSI report was sent K3 times, where K3 is a positive integer; The network scheduling signaling is received for the first time after the target cell completes the RRC reconfiguration. The network scheduling signaling is used to schedule uplink transmission and / or downlink reception. When the target cell receives a stop transmission indication message, wherein the stop transmission indication message is a release or reconfiguration message of the CSI report, or, if the CSI report is a semi-persistent report, the stop transmission indication message is a deactivation command of the CSI report; and The stop transmission indication information received in the target cell takes effect, wherein the stop transmission indication information is the release information or reconfiguration information of the CSI report, or the CSI report is the semi-persistent report, and the stop transmission indication information is the deactivation command of the CSI report.

10. The communication method according to any one of claims 1 to 9, wherein, The CSI report is either a periodic report or a semi-continuous report, and the time interval between the first and second time sub-units is greater than or equal to X time sub-units, where X is a positive integer; where... The first time sub-unit is at least one of the following: The first time sub-unit of the start time unit of the first CSI-RS resource; The last time sub-unit of the end time unit of the first CSI-RS resource; and The first time sub-unit of the time unit for receiving first information, the first information being used at least to indicate the reporting of the CSI report; The first CSI-RS resource is associated with the CSI report; The second time sub-unit is the last time sub-unit of at least one of the following time units: The time unit used to send the CSI report; Time unit used for receiving the LTM cell handover command; The time unit used to send confirmation information for the LTM cell handover command; The N5th time unit following the time unit used to send the confirmation information for the LTM cell handover command, where N5 is a positive integer; and The time unit for the pre-configuration information to take effect and / or the time unit for the TCI status of the target cell carried by the LTM cell handover command to take effect, wherein the pre-configuration information is used to configure the cell parameters of the target cell.

11. The communication method according to any one of claims 1 to 9, wherein, The CSI report is an aperiodic report, the time interval between the third time subunit and the second time subunit is greater than or equal to Y time subunits, and / or the time interval between the fourth time subunit and the second time subunit is greater than or equal to Y' time subunits, where Y is a positive integer and Y' is a positive integer. The second time sub-unit is the last time sub-unit of at least one of the following time units: The time unit used to send the CSI report; Time unit used for receiving the LTM cell handover command; The time unit used to send confirmation information for the LTM cell handover command; The N6th time unit following the time unit used to send the confirmation information for the LTM cell handover command, where N6 is a positive integer; and The time unit in which the pre-configuration information takes effect and / or the time unit in which the TCI status of the target cell carried by the LTM cell handover command takes effect, wherein the pre-configuration information is used to configure the cell parameters of the target cell; The third time subunit is the first time subunit of the time unit used to receive the second information, which is used to trigger the CSI report. The fourth time subunit is either the first time subunit of the start time unit of the first CSI-RS resource, or the fourth time subunit is the last time subunit of the end time unit of the first CSI-RS resource, and the first CSI-RS resource is associated with the CSI report.

12. The communication method according to claim 1, wherein, The CSI measurement begins before receiving the LTM cell handover command. The first CSI-RS resource and / or the port of the first CSI-RS resource are active between the last time sub-unit of the seventh time unit and the last time sub-unit of the eighth time unit. The seventh time unit is a time unit for receiving resource configuration information, a time unit for receiving a resource trigger command, or a time unit for a resource activation command to take effect. The eighth time unit is used for at least one of the following: receiving the LTM cell handover command, sending confirmation information for the LTM cell handover command, receiving first information, sending confirmation information for the first information, and sending the CSI report. Alternatively, the CSI measurement is performed after receiving the LTM cell handover command, and the first CSI-RS resource and / or the port of the first CSI-RS resource are active between the ninth and tenth time units; wherein the tenth time unit is at least one of the following: a time unit for sending the CSI report, a time unit for the end of the CSI measurement, a time unit for receiving release information of the first CSI-RS resource in the target cell, a time unit for the release information of the first CSI-RS resource received in the target cell to take effect, a time unit for receiving reconfiguration information of the first CSI-RS resource in the target cell, a time unit for the reconfiguration information of the first CSI-RS resource received in the target cell to take effect, a time unit for receiving a deactivation command for the first CSI-RS resource in the target cell, and a time unit for receiving the first CSI-RS report in the target cell. The ninth time unit is the time unit in which the deactivation command for S resources takes effect; the ninth time unit is at least one of the following: the time unit for receiving the LTM cell handover command, the time unit for sending the confirmation information of the LTM cell handover command, the time unit for receiving first information, the time unit for sending the confirmation information of the first information, the N7th time unit after the time unit for sending the confirmation information of the LTM cell handover command, the time unit in which the pre-configuration information takes effect and / or the time unit in which the TCI status of the target cell carried by the LTM cell handover command takes effect, the time unit for receiving the resource configuration information, the time unit in which the resource configuration information takes effect, the time unit for receiving the resource activation command, the time unit for sending the confirmation information of the resource activation command, the M4th time unit after receiving the resource activation command, and the M5th time unit after sending the confirmation information of the resource activation command; Wherein, the first CSI-RS resource is associated with the CSI report, the first information is used at least to indicate the reporting of the CSI report, N7 is a positive integer, M4 is a positive integer, M5 is a positive integer, the pre-configuration information is used to configure the cell parameters of the target cell, the resource configuration information is used to configure the first CSI-RS resource, the resource activation command is used to activate the first CSI-RS resource, the resource trigger command is used to trigger the first CSI-RS resource, and the pre-configuration information is used to configure the cell parameters of the target cell.

13. The communication method according to claim 1, wherein, The time unit in which the CSI reference resource for the CSI report is located is determined based on the time unit of the uplink channel resource carrying the CSI report; Alternatively, the CSI measurement begins before the LTM cell handover command is received, and the time unit in which the CSI reference resource used for the CSI report is located is the eleventh time unit or the Pth time unit before the eleventh time unit, where P is a positive integer. The eleventh time unit satisfies at least one of the following: The eleventh time unit is used to receive the LTM cell handover command; The eleventh time unit is used to send confirmation information for the LTM cell handover command; The eleventh time unit is the N8th time unit after the time unit used to send the confirmation information for the LTM cell handover command, where N8 is a positive integer; and The eleventh time unit is the time unit when the pre-configuration information takes effect and / or the time unit when the TCI status of the target cell carried by the LTM cell handover command takes effect. The pre-configuration information is used to configure the cell parameters of the target cell.

14. A communication method, comprising: Send an LTM cell handover command, which is used to trigger a handover from the original cell to the target cell; Receive the CSI report of the target cell, wherein the CSI report is obtained by performing CSI measurements on the target cell; The CSI measurement may begin before the LTM cell handover command is sent, or the CSI measurement may be performed after the LTM cell handover command is sent.

15. The communication method according to claim 14, wherein, The CSI measurement begins before the LTM cell handover command is sent, the CSI measurement begins in the first time unit, or the CSI measurement begins after the first time unit. Wherein, the first time unit satisfies at least one of the following: The first time unit is used as a time unit for sending resource configuration information, or the first time unit is the time unit when the resource configuration information takes effect. The resource configuration information is used to configure a first CSI-RS resource. The first CSI-RS resource is associated with the CSI report, and the first CSI-RS resource is a periodic resource. The first time unit is used to send a resource activation command, which is used to activate the first CSI-RS resource. The first CSI-RS resource is associated with the CSI report and is a semi-persistent resource. The first time unit is the M1th time unit after the time unit used to receive the confirmation information of the resource activation command, where M1 is a positive integer. The resource activation command is used to activate the first CSI-RS resource, which is associated with the CSI report and is the semi-persistent resource. The first time unit is used to send first information or to receive confirmation information of the first information, wherein the first information is at least used to instruct the reporting of the CSI report, the CSI report being associated with the first CSI-RS resource, and the first CSI-RS resource being the periodic resource or the semi-persistent resource; and The first time unit is used to send DCI, the DCI is used to trigger the CSI report, the CSI report is associated with the first CSI-RS resource, the first CSI-RS resource is an aperiodic resource, and the time interval between the first time unit and the time unit of the first CSI-RS resource is the first offset.

16. The communication method according to claim 14 or 15, wherein, The CSI measurement begins before the LTM cell handover command is sent, the CSI report is associated with the first CSI-RS resource, and the CSI measurement ends at the second time unit or the CSI measurement ends L time units before the second time unit, where L is a positive integer. Wherein, the second time unit satisfies at least one of the following: The second time unit is used to send the LTM cell handover command, and the first CSI-RS resource is a periodic resource or a semi-persistent resource; The second time unit is used to receive confirmation information of the LTM cell handover command, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the N1th time unit after the time unit used to receive the confirmation information of the LTM cell handover command, where N1 is a positive integer, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit when the pre-configuration information takes effect and / or the time unit when the TCI status of the target cell carried by the LTM cell handover command takes effect. The pre-configuration information is used to configure the cell parameters of the target cell. The first CSI-RS resource is the periodic resource or the semi-persistent resource. The second time unit is used to receive the CSI report, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit for sending a random access response in the target cell, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit for receiving message 3 in the target cell, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit in which the RRC reconfiguration completion message is received in the target cell, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit for the first transmission of network scheduling signaling after the target cell completes RRC reconfiguration. The network scheduling signaling is used to schedule uplink transmission and / or downlink reception. The first CSI-RS resource is the periodic resource or the semi-persistent resource. The second time unit is the time unit for sending the release information of the first CSI-RS resource in the target cell, where the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit for sending the reconfiguration information of the first CSI-RS resource in the target cell, where the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit in which the release information of the first CSI-RS resource sent in the target cell takes effect, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit in which the reconfiguration information of the first CSI-RS resource sent in the target cell takes effect, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The second time unit is the time unit in which the target cell sends the deactivation command for the first CSI-RS resource, where the first CSI-RS resource is the semi-persistent resource; The second time unit is the M2th time unit after the time unit in which the target cell receives confirmation information of the deactivation command for the first CSI-RS resource, where M2 is a positive integer, and the first CSI-RS resource is the semi-persistent resource; and By the second time unit, the number of CSI-RS transmissions on the first CSI-RS resource has reached K1 times, where K1 is a positive integer, and the first CSI-RS resource is the periodic resource or the semi-persistent resource.

17. The communication method according to claim 14, wherein, The CSI measurement is performed after the LTM cell handover command is sent, and the CSI measurement begins at or after the third time unit. Wherein, the third time unit satisfies at least one of the following: The third time unit is used to send the LTM cell handover command; The third time unit is used to receive confirmation information for the LTM cell handover command; The third time unit is the N2th time unit after the time unit used to receive the confirmation information of the LTM cell handover command, where N2 is a positive integer; The third time unit is the time unit when the pre-configuration information takes effect and / or the time unit when the TCI status of the target cell is carried by the LTM cell handover command. The pre-configuration information is used to configure the cell parameters of the target cell. The third time unit is used to send first information, or the third time unit is used to receive confirmation information of the first information, wherein the first information is at least used to instruct the reporting of the CSI report, the CSI report being associated with a first CSI-RS resource, and the first CSI-RS resource being a periodic resource or a semi-persistent resource; and The third time unit is used to send second information, which is used to trigger the CSI report. The CSI report is associated with the first CSI-RS resource, which is an aperiodic resource. The time interval between the third time unit and the time unit of the first CSI-RS resource is the second offset.

18. The communication method according to claim 14 or 17, wherein, The CSI measurement is performed after the LTM cell handover command is sent. The CSI report is associated with the first CSI-RS resource. The CSI measurement ends at the fourth time unit or the CSI measurement ends Q time units before the fourth time unit, where Q is a positive integer. Wherein, the fourth time unit satisfies at least one of the following: The fourth time unit is used to receive the CSI report, and the first CSI-RS resource is a periodic resource or a semi-persistent resource. The fourth time unit is the time unit for sending a random access response in the target cell, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The fourth time unit is the time unit for receiving message 3 in the target cell, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The fourth time unit is the time unit for receiving the RRC reconfiguration completion message in the target cell, and the first CSI-RS resource is the periodic resource or the semi-persistent resource; The fourth time unit is the time unit for sending network scheduling signaling for the first time after the target cell completes RRC reconfiguration. The network scheduling signaling is used to schedule uplink transmission and / or downlink reception. The first CSI-RS resource is the periodic resource or the semi-persistent resource. The fourth time unit is a time unit for sending the release information of the first CSI-RS resource in the target cell, or the fourth time unit is a time unit for sending the reconfiguration information of the first CSI-RS resource in the target cell, wherein the first CSI-RS resource is the periodic resource or the semi-persistent resource. The fourth time unit is the time unit when the release information of the first CSI-RS resource sent in the target cell takes effect, or the fourth time unit is the time unit when the reconfiguration information of the first CSI-RS resource sent in the target cell takes effect, wherein the first CSI-RS resource is the periodic resource or the semi-persistent resource. The fourth time unit is the time unit for sending the deactivation command of the first CSI-RS resource in the target cell, and the first CSI-RS resource is the semi-persistent resource; The fourth time unit is the M3rd time unit after the time unit in which the target cell receives the confirmation information of the deactivation command of the first CSI-RS resource, where M3 is a positive integer, and the first CSI-RS resource is the semi-persistent resource; and By the fourth time unit, the number of CSI-RS transmissions on the first CSI-RS resource has reached K2 times, where K2 is a positive integer, and the first CSI-RS resource is the periodic resource or the semi-persistent resource.

19. The communication method according to any one of claims 14 to 18, wherein, The CSI report is received in or after a fifth time unit, the fifth time unit being used to send first information or to receive confirmation information of the first information, the first information being used at least to instruct the CSI report to be reported.

20. The communication method according to any one of claims 14 to 18, wherein, The CSI report is a periodic report or a semi-continuous report, and the CSI report is received at or after the sixth time unit. The sixth time unit satisfies at least one of the following: The sixth time unit is used to send the LTM cell handover command; The sixth time unit is used to receive confirmation information for the LTM cell handover command; The sixth time unit is the N4th time unit after the time unit used to receive the confirmation information of the LTM cell handover command, where N4 is a positive integer; and The sixth time unit is the time unit when the pre-configuration information takes effect and / or the time unit when the TCI status of the target cell carried by the LTM cell handover command takes effect. The pre-configuration information is used to configure the cell parameters of the target cell.

21. The communication method according to any one of claims 14 to 20, wherein, The CSI report is either a periodic report or a semi-continuous report, and the time interval between the first and second time sub-units is greater than or equal to X time sub-units, where X is a positive integer; where... The first time sub-unit is at least one of the following: The first time sub-unit of the start time unit of the first CSI-RS resource; The last time sub-unit of the end time unit of the first CSI-RS resource; and The first time sub-unit of the time unit used to send first information, the first information being used at least to indicate the reporting of the CSI report; The first CSI-RS resource is associated with the CSI report; The second time sub-unit is the last time sub-unit of at least one of the following time units: Time unit used for receiving the CSI report; Time unit used for sending the LTM cell handover command; A time unit used to receive confirmation information for the LTM cell handover command; The N5th time unit following the time unit used to receive the confirmation information for the LTM cell handover command, where N5 is a positive integer; and The time unit for the pre-configuration information to take effect and / or the time unit for the TCI status of the target cell carried by the LTM cell handover command to take effect, wherein the pre-configuration information is used to configure the cell parameters of the target cell.

22. The communication method according to any one of claims 14 to 20, wherein, The CSI report is an aperiodic report. The time interval between the third and second time sub-units is greater than or equal to Y time sub-units, and / or the time interval between the fourth and second time sub-units is greater than or equal to Y' time sub-units, where Y is a positive integer and Y' is a positive integer. The second time sub-unit is the last time sub-unit of at least one of the following time units: Time unit used for receiving the CSI report; Time unit used for sending the LTM cell handover command; A time unit used to receive confirmation information for the LTM cell handover command; The N6th time unit following the time unit used to receive the confirmation information for the LTM cell handover command, where N6 is a positive integer; and The time unit in which the pre-configuration information takes effect and / or the time unit in which the TCI status of the target cell carried by the LTM cell handover command takes effect, wherein the pre-configuration information is used to configure the cell parameters of the target cell; The third time subunit is the first time subunit of the time unit used to send the second information, which is used to trigger the CSI report. The fourth time subunit is either the first time subunit of the start time unit of the first CSI-RS resource, or the fourth time subunit is the last time subunit of the end time unit of the first CSI-RS resource, and the first CSI-RS resource is associated with the CSI report.

23. The communication method according to claim 14, wherein, The CSI measurement begins before the LTM cell handover command is sent, and the first CSI-RS resource and / or the port of the first CSI-RS resource are active between the last time sub-unit of the seventh time unit and the last time sub-unit of the eighth time unit; wherein, the seventh time unit is a time unit for sending resource configuration information, a time unit for sending resource trigger commands, or a time unit for resource activation commands to take effect; the eighth time unit is used for at least one of the following: sending the LTM cell handover command, receiving confirmation information for the LTM cell handover command, sending first information, receiving confirmation information for the first information, and receiving the CSI report; Alternatively, the CSI measurement is performed after the LTM cell handover command is sent, and the first CSI-RS resource and / or the port of the first CSI-RS resource is active between the ninth and tenth time units; wherein the tenth time unit is at least one of the following: a time unit for receiving the CSI report, a time unit for the end of the CSI measurement, a time unit for sending release information of the first CSI-RS resource in the target cell, a time unit for the release information of the first CSI-RS resource sent in the target cell to take effect, a time unit for sending reconfiguration information of the first CSI-RS resource in the target cell, a time unit for the reconfiguration information of the first CSI-RS resource sent in the target cell to take effect, a time unit for sending a deactivation command of the first CSI-RS resource in the target cell, and a time unit for sending a deactivation command of the first CSI-RS resource in the target cell. The ninth time unit is at least one of the following: a time unit for sending the LTM cell handover command, a time unit for receiving confirmation information of the LTM cell handover command, a time unit for sending first information, a time unit for receiving confirmation information of the first information, the N7th time unit after the time unit for receiving confirmation information of the LTM cell handover command, a time unit for pre-configuration information to take effect and / or a time unit for the TCI status of the target cell carried by the LTM cell handover command to take effect, a time unit for sending the resource configuration information, a time unit for the resource configuration information to take effect, a time unit for sending the resource activation command, a time unit for receiving confirmation information of the resource activation command, the M4th time unit after sending the resource activation command, and the M5th time unit after receiving confirmation information of the resource activation command. Wherein, the first CSI-RS resource is associated with the CSI report, the first information is used at least to indicate the reporting of the CSI report, N7 is a positive integer, M4 is a positive integer, M5 is a positive integer, the pre-configuration information is used to configure the cell parameters of the target cell, the resource configuration information is used to configure the first CSI-RS resource, the resource activation command is used to activate the first CSI-RS resource, the resource trigger command is used to trigger the first CSI-RS resource, and the pre-configuration information is used to configure the cell parameters of the target cell.

24. The communication method according to claim 14, wherein, The time unit in which the CSI reference resource for the CSI report is located is determined based on the time unit of the uplink channel resource carrying the CSI report; Alternatively, the CSI measurement begins before the LTM cell handover command is sent, and the time unit in which the CSI reference resource used for the CSI report is located is the eleventh time unit or the Pth time unit before the eleventh time unit, where P is a positive integer; The eleventh time unit satisfies at least one of the following: The eleventh time unit is used to send the LTM cell handover command; The eleventh time unit is used to receive confirmation information for the LTM cell handover command; The eleventh time unit is the N8th time unit after the time unit used to receive the confirmation information of the LTM cell handover command, where N8 is a positive integer; and The eleventh time unit is the time unit when the pre-configuration information takes effect and / or the time unit when the TCI status of the target cell carried by the LTM cell handover command takes effect. The pre-configuration information is used to configure the cell parameters of the target cell.

25. A communication device, comprising: The receiving module is used to receive LTM cell handover commands; The processing module is used to respond to the LTM cell handover command and switch from the original cell to the target cell; A transmitting module is configured to transmit a CSI report in the target cell, wherein the CSI report is obtained based on CSI measurements of the first CSI-RS resource of the channel state information reference signal of the target cell; The CSI measurement may begin before receiving the LTM cell handover command, or the CSI measurement may be performed after receiving the LTM cell handover command.

26. A communication device, comprising: The sending module is used to send an LTM cell handover command, which is used to trigger a handover from the original cell to the target cell. A receiving module is configured to receive the CSI report of the target cell, wherein the CSI report is obtained by performing CSI measurements on the target cell; The CSI measurement may begin before the LTM cell handover command is sent, or the CSI measurement may be performed after the LTM cell handover command is sent.

27. A non-transitory computer-readable storage medium having a computer program stored thereon, wherein, When the computer program is run by the processor, the communication method of any one of claims 1 to 24 is executed.

28. A computer program product comprising a computer program, wherein, When the computer program is executed by the processor, it implements the communication method according to any one of claims 1 to 24.

29. A communication device comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, wherein... When the processor runs the computer program, it performs the communication method according to any one of claims 1 to 24.

Images