Mobility management method and wireless communication device

Abstract

Embodiments of the present application provide a mobility management method and a wireless communication device. The mobility management method is performed by a user equipment, and comprises: receiving configuration information sent by a network side, the configuration information comprising at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, and measurement reference resource configuration information of the candidate cell satisfying a certain constraint; measuring a layer 1-signal to interference plus noise ratio (L1-SINR) or layer 1 reference signal received power (L1-RSRP) of a channel state information reference signal (CSI-RS) of the candidate cell, sending an L1-SINR or L1-RSRP measurement report of the CSI-RS of the candidate cell to the network side, performing event-triggered measurement reporting on the basis of the measured L1-RSRP or L1-SINR, and before a handover command or during handover, measuring and / or reporting the CSI of the candidate cell.

Description

Mobility management method and wireless communication device TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of mobile communication technology, in particular to a mobility management method and a wireless communication device. BACKGROUND

[0002] In the existing mobile communication system, when a user equipment (UE) moves between cells, the serving cell needs to be switched. Before Rel-18, the switching process is mainly triggered by L3 layer measurement, and the reconfiguration and synchronization are performed through radio resource control (RRC) signaling to complete the switching of the primary cell (PCell) and the secondary cell (PSCell), while releasing and adding other cells (SCells), which involves resetting of L2 and L1, resulting in long switching delay and service interruption. To optimize the switching performance, Rel-18 introduces LTM (L1 / L2 triggered mobility), which has advantages in switching delay and interruption time compared to L3 layer measurement triggered switching. However, the application of LTM still has many limitations, for example, it only supports switching within the same base station (gNB) and cannot realize mobility between different base stations (cross-CU), which limits the application scenarios of LTM. In addition, LTM only supports SSB-based layer-1 measurement and does not support event-triggered measurement reporting, resulting in lower robustness than L3 layer mobility. Therefore, in the future, LTM needs to be extended to include CSI-RS-based layer-1 measurement, and standardized enhanced functions are needed to achieve higher robustness and shorter interruption time in Rel-19.

[0003] SUMMARY

[0004] Embodiments of the present application provide a mobility management method, an event-triggered measurement result reporting method, and a wireless communication device.

[0005] The mobility management method provided by the embodiments of the present application is executed on a user equipment, which includes: receiving configuration information sent by a network side, the configuration information including at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, and measurement reference resource configuration information of the candidate cell satisfying certain constraints; and measuring a layer-1 signal-to-interference-and-noise ratio (L1-SINR) or a layer-1 reference signal received power (L1-RSRP) of a channel state information reference signal (CSI-RS) of the candidate cell, and sending a measurement report of the L1-SINR or the L1-RSRP of the CSI-RS of the candidate cell to the network side.

[0006] Through the above technical solution, the measurement accuracy and flexibility of mobility management are improved, the switching performance is optimized, the switching delay is reduced, the signaling overhead is reduced, and the network resource utilization efficiency is improved.

[0007] The embodiment of the present application provides a measurement result reporting method based on event triggering, which is executed on a user equipment, and comprises the following steps: receiving configuration information sent by a network side, wherein the configuration information comprises at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, event-based reporting configuration information and measurement reference resource configuration information of the candidate cell meeting certain constraints; performing layer-one measurement based on the configuration information to obtain layer-one measurement quantity; and determining whether to perform event-triggered reporting based on a defined triggering event.

[0008] Through the above technical solution, the measurement reporting based on event triggering ensures fast response under critical network conditions, optimizes handover performance, reduces handover delay, optimizes the use of measurement resources, reduces unnecessary reporting, and improves network performance and resource utilization efficiency.

[0009] The embodiment of the present application provides a mobility management method, which is executed on a user equipment, and comprises the following steps: receiving configuration information sent by a network side, wherein the configuration information comprises at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, measurement reference resource configuration information of the candidate cell meeting certain constraints; performing CSI measurement and / or reporting of the candidate cell based on the configuration of a reference signal, wherein the reporting of CSI information of the candidate cell is located before a handover command, or the reporting of CSI information of the candidate cell is located after the handover command, or the measurement and reporting of CSI information of the candidate cell are located after the handover command.

[0010] Through the above technical solution, the CSI measurement and / or reporting of the candidate cell before and after cell handover ensures that the target cell can quickly obtain precoding information after handover, so that a higher MCS level can be used to transmit service data, ensures the performance of the network, reduces the influence of handover on the performance of the network, and improves the stability and efficiency of handover.

[0011] The embodiment of the present application provides a mobility management method, which is executed on a network side, and comprises the following steps: sending configuration information to a user equipment, wherein the configuration information comprises at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, measurement reference resource configuration information of the candidate cell meeting certain constraints; and requesting the user equipment to perform measurement on layer-one signal-to-interference-and-noise ratio (L1-SINR) or layer-one reference signal received power (L1-RSRP) of channel state information reference signal (CSI-RS) of the candidate cell, and receiving a measurement report of the L1-SINR or L1-RSRP of the CSI-RS of the candidate cell sent by the user equipment.

[0012] By the technical solution, the measurement accuracy and flexibility of mobility management are improved, the handover performance is optimized, the handover delay is reduced, the signaling overhead is reduced, and the network resource utilization efficiency is improved.

[0013] The method for reporting measurement results based on event triggering provided by the embodiment of the application is executed at a network side, and includes the following steps: sending configuration information to a user equipment, wherein the configuration information includes at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, event-based reporting configuration information, and measurement reference resource configuration information of the candidate cell satisfying certain constraints;

[0014] requesting the user equipment to perform layer-one measurement based on the configuration information to obtain a layer-one measurement quantity; and requesting the user equipment to determine whether to perform event-triggered reporting based on a defined triggering event.

[0015] By the technical solution, the measurement accuracy and flexibility of mobility management are improved, the measurement accuracy and flexibility of mobility management are improved, the handover performance is optimized, the handover delay is reduced, the signaling overhead is reduced, and the network resource utilization efficiency is improved.

[0016] The method for reporting measurement results based on event triggering provided by the embodiment of the application is executed at a network side, and includes the following steps: sending configuration information to a user equipment, wherein the configuration information includes at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, event-based reporting configuration information, and measurement reference resource configuration information of the candidate cell satisfying certain constraints;

[0017] By the technical solution, the measurement accuracy and flexibility of mobility management are improved, the measurement accuracy and flexibility of mobility management are improved, the handover performance is optimized, the handover delay is reduced, the signaling overhead is reduced, and the network resource utilization efficiency is improved.

[0018] The wireless communication device provided by the embodiment of the application includes a processor and a memory, the memory is used for storing a computer program, the processor is used for calling and running the computer program stored in the memory, and the method described above is executed.

[0019] The user equipment provided by the embodiments of the present application comprises a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory to execute the method described above.

[0020] The base station provided by the embodiments of the present application comprises a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory to execute the method described above.

[0021] The network element provided by the embodiments of the present application comprises a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory to execute the method described above.

[0022] The chip provided by the embodiments of the present application is used for implementing the method described above.

[0023] Specifically, the chip comprises a processor, which is used for calling and running a computer program from a memory, so that the device installed with the chip executes the method described above.

[0024] The computer readable storage medium provided by the embodiments of the present application is used for storing a computer program, and the computer program makes a computer execute the method described above.

[0025] The computer program product provided by the embodiments of the present application comprises computer program instructions, and the computer program instructions make a computer execute the method described above.

[0026] The computer program provided by the embodiments of the present application, when running on a computer, makes the computer execute the method described above.

[0027] The above technical solution has the following advantages: improving measurement accuracy; by measuring the layer one signal-to-interference-and-noise ratio (L1-SINR) or the layer one reference signal received power (L1-RSRP) of the channel state information reference signal (CSI-RS) of the candidate cell, the signal quality of the cell can be more accurately reflected. Through the above technical solution, the measurement accuracy and flexibility of mobility management are improved, the handover performance is optimized, the handover delay is reduced, the signaling overhead is reduced, and the network resource utilization efficiency is improved. Through the above technical solution, by event-triggered measurement reporting, fast response under critical network conditions is ensured, handover performance is optimized, handover delay is reduced, measurement resource usage is optimized, unnecessary reporting is reduced, network performance and resource utilization efficiency are improved. Through the above technical solution, by performing CSI measurement and / or reporting of the candidate cell before and after cell handover, it is ensured that the post-target cell can quickly obtain precoding information and always have reliable channel state information, so that a higher MCS level can be used to transmit service data, ensuring the performance of the network, reducing the impact of handover on network performance, improving the stability and efficiency of handover, and reducing the risk of handover failure due to insufficient channel information. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings, which are included to provide a further understanding of the present application, constitute a part of this application and illustrate certain illustrative embodiments of the present application and its description, which do not constitute an improper limitation of the present application. In the drawings:

[0029] FIG. 1A is a schematic diagram of a wireless communication system architecture according to an embodiment of the present application;

[0030] FIG. 1B is a flowchart of a mobility management method according to an embodiment of the present application;

[0031] FIG. 1C is a schematic diagram of a CSI-RS beam measurement and L1-SINR reporting process based on a candidate cell according to an embodiment of the present application;

[0032] FIG. 2A is a flowchart of a mobility management method according to an embodiment of the present application;

[0033] FIG. 2B is a flowchart of an event-triggered measurement result reporting process according to an embodiment of the present application;

[0034] FIG. 3 is a flowchart of a mobility management method according to an embodiment of the present application;

[0035] FIG. 4A is a flowchart of a CSI reporting mechanism according to an embodiment of the present application;

[0036] FIG. 4B is a flowchart of a CSI reporting mechanism according to an embodiment of the present application;

[0037] FIG. 4C is a schematic diagram of beam measurement based on candidate cell semi-persistent or aperiodic CSI-RS measurement according to an embodiment of the present application;

[0038] FIG. 5 is a schematic structural diagram of a wireless communication device according to an embodiment of the present application;

[0039] FIG. 6 is a schematic structural diagram of a chip according to an embodiment of the present application;

[0040] FIG. 7 is a schematic block diagram of a wireless communication system according to an embodiment of the present application. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0042] In existing mobile communication systems, when a user equipment (UE) moves from the coverage area of one cell to another, the handover of the serving cell becomes a necessary process. Traditionally, before Rel-18, the handover of the serving cell is mainly triggered by L3 layer measurement, and the reconfiguration and synchronization are realized through radio resource control (RRC) signaling, so as to complete the handover of the primary cell (PCell) and the secondary cell (PSCell), and release and add additional cells (SCells) in applicable cases. This process involves complete resetting of L2 (data link layer) and L1 (physical layer), resulting in longer handover delay, greater system overhead, and longer service interruption time.

[0043] To solve the above problems, Rel-18 introduces LTM (L1 / L2 trigger mobility) technology. Compared with the traditional L3 measurement trigger-based mobility, LTM can provide significant improvement in terms of handover delay and interruption time. However, LTM also has some limitations. First, the operation of LTM only supports inter-cell mobility under the same base station (gNB) or control unit (CU), which may limit its application scenarios in actual network deployment. By extending the LTM operation to cell switching between different base stations (cross-CU), the network can obtain the advantages of LTM in more handover cases.

[0044] Secondly, L3 mobility enables UE to report measurement results based on certain events through measurement reporting triggering, thus reducing the signaling overhead caused by periodic reporting. However, LTM mobility is based on L1 measurement, which does not support such event-triggered mechanism. Currently, L1 measurement of LTM procedure is limited to Synchronization Signal Block (SSB) measurement, which cannot cover a wider range of signal types. By extending L1 measurement to Channel State Information Reference Signal (CSI-RS), this limitation can be broken and it is expected to improve the throughput of the target cell immediately after cell switching.

[0045] In addition, L3 mobility has been continuously optimized in multiple versions, such as Conditional Handover (CHO) and other conditional mobility procedures (e.g. CPAC and SCPAC) are developed, which can operate without prior signaling exchange with the source cell, significantly improving the robustness of the system. Although LTM technology in Rel-18 performs well in reducing interruption time, its robustness has not reached the level based on L3 conditional mobility procedures. Therefore, in Rel-19, it is necessary to enhance and standardize LTM to achieve the dual optimization of high robustness and short interruption time.

[0046] In the prior art, CSI-IM measurement resource configuration is mainly used for inter-cell interference measurement. In the existing cell, the CSI-IM resource is usually configured as a zero-power CSI-RS (ZP CSI-RS), i.e. no signal is transmitted, while normal signal transmission (e.g. data transmission) is performed on the same resource in the neighboring cell. In this way, by measuring the received power of the CSI-IM resource by the user equipment (UE), the interference from other cells can be estimated, and the signal measured on the CSI-IM resource is usually assumed to be the PDSCH of the neighboring cell.

[0047] In addition, CSI-IM resource supports three time-domain behaviors: periodic, semi-persistent, and aperiodic. CSI-IM resource has two possible resource element (RE) patterns, one is 22 pattern, spanning two consecutive subcarriers and two consecutive symbols; the other is 41 pattern, spanning four consecutive subcarriers and one symbol. These RE patterns are configured by the RRC parameter csi-IM-ResourceElementPattern.

[0048] In the prior art, CSI-RS (Channel State Information Reference Signal) is used for L1-RSRP (Reference Signal Received Power) and L1-SINR (Signal to Interference Noise Ratio) calculation. If a user equipment (UE) is configured with one NZP-CSI-RS-ResourceSet and the higher layer parameter repetition is set to "on", the UE can assume that the CSI-RS resources in the NZP-CSI-RS-ResourceSet (as described in clause 5.2.2.3.1 of the standard 38.214) are transmitted using the same downlink spatial domain transmission filter, which are transmitted in different orthogonal frequency division multiplexing (OFDM) symbols. If repetition is set to "off", the UE shall not assume that the CSI-RS resources in the NZP-CSI-RS-ResourceSet are transmitted using the same downlink spatial domain transmission filter.

[0049] When a UE is configured with a CSI-ReportConfig and the reportQuantity is set to "cri-RSRP", "cri-SINR" or "none", if the CSI-ResourceConfig (i.e. the higher layer parameter resourcesForChannelMeasurement) used for channel measurement contains NZP-CSI-RS-ResourceSet configured with the higher layer parameter repetition and without trs-Info, the UE can only configure the same number (1 or 2) of ports and these ports are configured by the higher layer parameter nrofPorts for all CSI-RS resources in the set. In addition, if the UE is configured with a CSI-RS resource in the same OFDM symbol as a SS / PBCH block, the UE can assume that the CSI-RS is quasi co-located with the SS / PBCH block when "typeD" applies. The UE shall not expect to be configured with a CSI-RS in the physical resource blocks (PRBs) that overlap with a SS / PBCH block and the UE shall expect that the CSI-RS uses the same subcarrier spacing as the SS / PBCH block.

[0050] In the prior art, the processing delay of CSI-RS (Channel State Information Reference Signal) is determined by two parameters Z and Z'. Z is mainly used to describe the parsing time of DCI (Downlink Control Information), and Z' is used to describe the time of channel state measurement, i.e. the time required to complete CSI (Channel State Information) measurement. Since A-CSI (Activated CSI) is activated by DCI, only after the DCI is parsed, the measurement requirement of CSI can be determined, such as whether CSI measurement is required, so the parsing time of DCI is also a factor to be considered.

[0051] In the protocol, the specific values of Z and Z' are specified in detail, for example, in the protocol 38.214, the value requirements of Z and Z' under different requirements are given. The calculation time required by different codebook types or measurement types is also different, for example, for Rel-15 Type-I codebook, Rel-16 Type-II codebook and Rel-17 Type-II codebook, the processing time of CSI mainly depends on the value requirements of Z and Z' under different requirements.

[0052] In the prior art, the signaling procedure of LTM (L1 / L2 Triggered Mobility) mainly involves the signaling interaction between the user equipment (UE), the source base station (gNB) and the target base station. The main purpose of LTM is to accelerate the handover process by triggering the physical layer (L1) or data link layer (L2), and to reduce the delay and interruption time during handover.

[0053] In the LTM operation process, when the UE detects a decrease in signal quality or receives a stronger signal from the target cell, the L1 or L2 layer triggers the mobility procedure and sends a handover request to the source base station. After receiving the request, the source base station determines whether to perform handover based on the measurement results and information of the target base station. Subsequently, the source base station communicates with the target base station through the Xn interface or NG interface to complete the pre-allocation of resources and the preparation for handover in the target cell.

[0054] Compared with the traditional L3 layer measurement triggered mobility, LTM reduces the complexity of signaling and does not rely on L3 layer measurement reporting and RRC signaling exchange. Its advantage is to significantly reduce the delay of handover and reduce the system overhead caused by L2 and L3 layers. However, the current LTM operation has certain limitations, for example, it only supports cell handover within the same base station or control unit (CU) and cannot be applied to handover scenarios across base stations. In addition, LTM also needs to be optimized for different network configurations in the signaling procedure to improve its applicability in different deployment scenarios.

[0055] The procedure of LTM (L1 / L2 Triggered Mobility) mainly involves the signaling interaction between the user equipment (UE) and the base station (gNB), and the specific steps are as follows:

[0056] Step 1: Measurement reporting phase: the UE sends a MeasurementReport message to the gNB, and the gNB decides whether to configure LTM according to the report and starts the preparation work of LTM.

[0057] Step 2: RRC reconfiguration phase: the gNB sends an RRCReconfiguration message to the UE, which contains the LTM candidate configuration, and the UE receives and stores the configuration.

[0058] Step 3: Configuration confirmation phase: UE confirms the reception of LTM candidate configuration and sends RRCReconfigurationComplete message to gNB.

[0059] Step 4: Synchronization phase:

[0060] Before receiving the cell handover command, the UE synchronizes with the LTM candidate cell in the downlink and activates or deactivates the TCI (Transmission Configuration Indication) state of the LTM candidate cell according to the trigger of the gNB.

[0061] If UE-based time advance (TA) measurement is configured, the UE can synchronize with the LTM candidate cell in the uplink through TA measurement or sending a preamble to obtain the TA value. The UE relies on network implementation to ensure the validity of TA and does not maintain the TA timer of the candidate cell.

[0062] Step 5: L1 measurement phase: UE performs L1 layer measurement on the configured LTM candidate cell and sends L1 measurement report to gNB. The measurement is based on RRC reconfiguration.

[0063] Step 6: Cell handover command phase: gNB decides to perform handover to the target cell and triggers the LTM cell handover command through MAC CE message, which includes target configuration ID, TCI state, downlink / uplink beam indication and timing advance command of the target cell (if applicable). UE switches to the target cell according to the command and applies the candidate configuration indicated by the target configuration ID.

[0064] Step 7: Random access procedure: If the UE does not have a valid TA value for the target cell, the UE performs a random access procedure to the target cell according to TS 38.321.

[0065] Step 8: Handover completion phase: UE sends RRCReconfigurationComplete message to the target cell to complete the LTM cell handover. If the UE performs a random access procedure, the LTM handover is considered successful when the RA procedure is successfully completed; if the RA procedure is not performed, the handover is considered successful when the first uplink data of the UE is successfully received.

[0066] Steps 4 to 8 can be executed multiple times based on the LTM candidate configuration provided in step 2 to perform subsequent cell handover. The entire air interface procedure is applicable to intra-gNB-DU and inter-gNB-DU LTM operation, and the overall LTM procedure is also described in detail in TS 38.401.

[0067] In the prior art, Rel-19 proposes event-driven beam measurement, mainly including the following event types:

[0068] Event 1: The quality of the current beam is lower than a predetermined threshold value.

[0069] Event 2: The quality (such as L1-RSRP) of at least one new beam is better than the quality of the current beam and reaches a threshold value.

[0070] Event 7: The quality (such as L1-RSRP) of at least one new beam is better than the quality of the Mth optimal beam in the activated TCI state and reaches a threshold value.

[0071] Based on these event types, the terminal reports the corresponding beam measurement information through UCI (uplink control information). The allocation of uplink resources can be obtained through two modes, mode A and mode B:

[0072] Mode A: At least 1-bit indication information is supported in the first PUCCH channel to request resources for the second uplink channel to transmit the beam report.

[0073] Mode B: At least 1-bit indication information is supported in the first PUCCH channel to inform the second uplink channel for transmitting the beam report.

[0074] For event 2, the terminal reports the measurement content including: CRI or SSBRI#1, CRI or SSBRI#2, …, CRI or SSBRI#N, L1-RSRP#1, differential L1-RSRP#2, …, differential L1-RSRP#N.

[0075] If the RRC enables the reporting mode of the current beam, the differential L1-RSRP of the current beam is also reported. The specific description is as follows:

[0076] Differential L1-RSRP#2~#N / current beam is determined based on the difference between the measured L1-RSRP (corresponding to CRI / SSBRI#2~#N / current beam) and the measured L1-RSRP (corresponding to CRI / SSBRI#1).

[0077] L1-RSRP#1 is the maximum RSRP value measured in the report, which is an absolute L1-RSRP.

[0078] Based on the above technology, the event-driven beam measurement of Rel-19 can effectively improve the measurement and management accuracy of beam quality, especially in terms of multi-beam selection and reporting, which can adapt to more complex wireless environments and ensure the stability and performance of the system.

[0079] The technical solutions of the embodiments of the present application can be applied to various wireless communication systems, for example: a Long Term Evolution (LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD) system, a 5G communication system, or a future wireless communication system, etc.

[0080] For example, the wireless communication system 100 to which the embodiments of the present application are applied is shown in FIG. 1A. The wireless communication system 100 can include a network side device 110, which can be a device communicating with a user equipment 120 (UE). The network side device 110 can provide communication coverage for a specific geographic area and can communicate with the user equipment located within the coverage area. Optionally, the network side device 110 can be a base station or a location management function (LMF) for providing positioning services. Optionally, the base station can be an evolved node B (eNB or eNodeB) in an LTE system, or the base station can be a mobile switching center, a relay station, an access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a network device in a 5G network, or a base station in a future communication system, etc.

[0081] The wireless communication system 100 also includes at least one user equipment 120 that is within the coverage of the network-side device 110. As used herein, "user equipment" includes, but is not limited to, an apparatus that is configured to receive / transmit communication signals via a wired connection, such as via a Public Switched Telephone Network (PSTN), a Digital Subscriber Line (DSL), a digital cable, a direct cable connection; and / or another data connection / network; and / or a wireless interface, such as for a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter; and / or another user equipment; and / or an Internet of Things (IoT) device. A user equipment that is configured to communicate over a wireless interface can be referred to as a "wireless communication user equipment 120," a "wireless user equipment 120," or a "mobile user equipment 120." Examples of mobile user equipment 120 include, but are not limited to, a satellite or cellular telephone; a Personal Communications System (PCS) user equipment 120 that can combine a cellular radiotelephone with data processing, facsimile, and data communications capabilities; a PDA that can include a wireless radio telephone, a pager, Internet / intranet access, a Web browser, a notepad, a calendar, and / or a Global Positioning System (GPS) receiver; and a conventional laptop and / or palmtop receiver, or other appliance that includes a radio telephone transceiver. User equipment can refer to an access user equipment 120, a subscriber unit, a subscriber station, a mobile station, a mobile, a remote station, a remote user equipment, a mobile equipment, a wireless communication equipment, or a user agent. An access user equipment 120 can be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device having wireless communication functions, a computing device, or another processing device connected to a wireless modem, an in-vehicle device, a wearable device, a user equipment in a 5G network, or a user equipment in a future evolved PLMN, etc.

[0082] In some embodiments of the present application, a mobility management method is executed on a user equipment 120, comprising: receiving configuration information sent by a network 130 side, the configuration information comprising at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, measurement reference resource configuration information of the candidate cell satisfying certain constraints; and measuring a layer one signal to interference noise ratio (L1-SINR) or a layer one reference signal received power (L1-RSRP) of a channel state information reference signal (CSI-RS) of the candidate cell, and sending a L1-SINR or L1-RSRP measurement report of the CSI-RS of the candidate cell to the network 130 side. Through the above technical solution, the measurement accuracy and flexibility of mobility management are improved, the handover performance is optimized, the handover delay is reduced, the signaling overhead is reduced, and the network resource utilization efficiency is improved.

[0083] A measurement result reporting method based on event triggering provided by an embodiment of the present application is executed on a user equipment 120, comprising: receiving configuration information sent by a network 130 side, the configuration information comprising at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, event-based reporting configuration information, and measurement reference resource configuration information of the candidate cell satisfying certain constraints; performing layer one measurement based on the configuration information to obtain a layer one measurement quantity; and determining whether to perform event-triggered reporting based on a defined triggering event. Through the above technical solution, by using event-triggered measurement reporting, fast response under critical network conditions is ensured, the handover performance is optimized, the handover delay is reduced, the use of measurement resources is optimized, unnecessary reporting is reduced, and the network performance and resource utilization efficiency are improved.

[0084] A mobility management method provided by an embodiment of the present application is executed on a user equipment 120, comprising: receiving configuration information sent by a network 130 side, the configuration information comprising at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, and measurement reference resource configuration information of the candidate cell satisfying certain constraints; performing CSI measurement and / or reporting of the candidate cell based on configuration of a reference signal, wherein the reporting of CSI information of the candidate cell is located before a handover command, or the reporting of CSI information of the candidate cell is located after the handover command, or the measurement and reporting of CSI information of the candidate cell are located after the handover command. Through the above technical solution, by performing CSI measurement and / or reporting of the candidate cell before and after cell handover, it is ensured that the target cell can quickly obtain precoding information after handover, so that a higher MCS level can be used to transmit service data, the network performance is ensured, the impact of handover on network performance is reduced, and the stability and efficiency of handover are improved.

[0085] Optionally, the network 130 side can refer to a current serving cell, can also refer to a candidate cell, and can be a primary serving cell or a secondary cell.

[0086] Optionally, the user equipment 120 can perform Device to Device (D2D) communication.

[0087] Optionally, the 5G communication system or 5G network can also be referred to as a New Radio (NR) system or NR network.

[0088] The wireless communication system 100 further includes a network 130. The network 130 can be an IP mobile communication network operated by a mobile communication operator. For example, the network 130 can be a core network of a mobile communication operator that operates and manages the wireless communication system 100, or can be a core network of a virtual mobile communication operator such as an MVNO (Mobile Virtual Network Operator).

[0089] The network 130 can be connected with the network-side device 110, and serves as a relay device for transmitting user data. The user equipment 120 transmits and receives user data via the network 130. It should be noted that the communication of user data is not limited to IP communication, and can also be non-IP communication.

[0090] FIG. 1A exemplarily shows one network-side device 110, two user equipment 120, and a network 130. Optionally, the wireless communication system 100 can include multiple network devices, and each network device can include other numbers of user equipment within its coverage, which is not limited in the embodiments of the present application.

[0091] Optionally, the wireless communication system 100 can further include a network controller, a mobility management entity, a network element, and other network entities, which are not limited in the embodiments of the present application. For example, the network 130 can include a network controller, a mobility management entity, a network element, and other network entities, which are not limited in the embodiments of the present application.

[0092] It should be understood that the devices with wireless communication functions in the network / system in the embodiments of the present application can be referred to as wireless communication devices. Taking the wireless communication system 100 shown in FIG. 1A as an example, the wireless communication devices can include the network-side device 110, the user equipment 120, and the network 130 with communication functions. The network-side device 110 and the user equipment 120 can be the specific devices described above, which will not be described herein again. The wireless communication devices can further include other devices (the network 130) in the wireless communication system 100. For example, the network 130 can include a network controller, a mobility management entity, and other network entities, which are not limited in the embodiments of the present application.

[0093] It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and / or", herein, is merely used to represent an associated relationship between associated objects, and can represent three relationships, for example, A and / or B, which can represent three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects. In some embodiments, the term "configuration" can refer to "pre-configuration" and "network configuration". The terms "define" or "predefine" in the embodiments of the present application can be realized by pre-storing corresponding codes, tables or other indications of related information in devices (such as UEs and network devices). The present application does not limit the specific implementation. For example, "define" or "predefine" can refer to those defined in the protocol. It should also be understood that the "protocol" in the present application can refer to a standard protocol in the communication field, which can include Long Term Evolution (LTE) protocol, new radio (NR) protocol and related protocols applied in future communication systems. The present application does not limit this.

[0094] The present application is based on the existing protocol, further supports the CSI-RS beam measurement of candidate cells, event-triggered cell L1 measurement reporting, and the acquisition of candidate cell CSI before or during the LTM handover command. First, the present application proposes the constraint relationship between the candidate cell CSI-RS and the CSI-IM measurement resource configuration, and proposes a two-level reporting process of CSI-RS resource triggering and L1 measurement results under different time domain behaviors in combination with SSB measurement and CSI-RS measurement.

[0095] Secondly, the present application solves the problem of multi-cell, multi-beam measurement reporting quantity in L1 event-triggered reporting, and proposes the reporting priority of different cells and / or beams in event-triggered reporting. In addition, the present application also gives the possible scheme of candidate cell CSI reporting before the handover command, sets the reporting priority, and analyzes the influence on the CSI processing time.

[0096] Further, from the perspective of the robustness of handover, reducing the reporting overhead and ensuring the system performance after handover, the present application combines the event-triggered L1 measurement reporting, the L1 reporting based on CSI-RS measurement and the CSI reporting based on CSI-RS measurement, and proposes the corresponding air interface processing flow and the main air interface reporting quantity. The design effectively improves the handover performance of the system, while reducing the complexity and overhead of the reporting.

[0097] Through the present application, the terminal can effectively reduce the handover delay when performing handover, and improve the performance of the system after handover, while ensuring the reliability of handover. For example, the CSI-RS-based L1-SINR or L1-RSRP measurement is more flexible and has higher reliability than the SSB-based L1-RSRP measurement. In addition, for the LTM scenario, the CSI-RS-based CSI measurement can ensure that the base station quickly obtains the CSI information of the terminal after the terminal switches to the target cell, or obtains the CSI information of the user in advance before the handover command, so as to ensure that the terminal can perform data transmission at a higher rate after switching to the target cell, thereby significantly improving the system performance.

[0098] The measurement and reporting mechanism of the present application can optimize the handover performance, reduce the handover delay, optimize the use of measurement resources, reduce unnecessary reporting, improve the network performance and resource utilization efficiency, and is particularly suitable for scenarios requiring fast handover and high data rate.

[0099] To solve the above technical problems, some technical solutions of the present application solve the above technical problems from the following aspects:

[0100] (1) CSI-RS beam measurement and L1-SINR reporting process based on candidate cells.

[0101] In some embodiments, Figure 1B is a flowchart of a mobility management method provided by an embodiment of the present application. A mobility management method is executed on a user equipment, including: operation 101B: receiving configuration information sent by a network side, the configuration information including at least one of ID information of a candidate cell, measurement and reporting configuration information of the candidate cell, and measurement reference resource configuration information of the candidate cell satisfying certain constraints; and operation 102B: measuring the layer one signal to noise ratio L1-SINR or layer one reference signal received power L1-RSRP of the channel state information reference signal CSI-RS of the candidate cell, and sending the L1-SINR or L1-RSRP measurement report of the CSI-RS of the candidate cell to the network side. The network side can refer to the current serving cell, the candidate cell, the primary serving cell or the secondary cell.

[0102] In some embodiments, the configuration information is a radio resource control (RRC) reconfiguration message sent by the network side. In some embodiments, the candidate cell is configured with a first resource set and a second resource set, the first resource set is used for channel measurement by the candidate cell using CSI-RS resources, and the second resource set is used for interference measurement by the candidate cell using channel state information interference measurement (CSI-IM) resources or non-zero power channel state information reference signal (NZP CSI-RS) resources, wherein each CSI-RS resource is associated to one CSI-IM resource or one NZP CSI-RS resource in order. In some embodiments, satisfying certain constraints means satisfying at least one of time domain, frequency domain, and resource pattern constraints. In some embodiments, the pattern of CSI-IM resource configuration of different candidate cells is the same as the pattern of CSI-IM resource configuration of the serving cell. The pattern of resource configuration is the pattern of CSI-IM. In some embodiments, the number of resource blocks occupied by the frequency domain resources of the CSI-IM resources of different candidate cells is the same as the number of resource blocks occupied by the frequency domain resources of the CSI-IM resources of the serving cell. In some embodiments, the time domain behavior of the CSI-IM and / or CSI-RS resources of different candidate cells is periodic, semi-persistent, or aperiodic, and the time domain behavior of the CSI-IM and / or CSI-RS resources of the serving cell is periodic, semi-persistent, or aperiodic. In some embodiments, the corresponding measurement reference signals (RSs) in the same reporting instance are located within one measurement time window in the time domain.

[0103] In some embodiments, the measurement time window is L consecutive time slots, and L is configured or predefined. In some embodiments, the value of L is any one of L ∈ {1, 2, 3, …, 40} slots. In some embodiments, the mobility management method further comprises: the user equipment performs downlink synchronization with the candidate cell, wherein the measurement of the CSI-RS resources of the candidate cell is based on the timing information of the downlink synchronization of the candidate cell. In some embodiments, the coordination between the serving cell and the candidate cell comprises that the serving cell sends a request message to the candidate cell, and the candidate cell replies to the serving cell with a response message after receiving the request message. In some embodiments, the user equipment reports a synchronization completion message to notify the serving cell and / or the candidate cell to activate the downlink of the semi-persistent or aperiodic CSI-RS resources, or to activate the semi-persistent or aperiodic L1-SINR or L1-RSRP measurement report. In some embodiments, the activation of the semi-persistent or aperiodic CSI-RS resources of the candidate cell is completed by the serving cell, and the user equipment reports the semi-persistent or aperiodic CSI based on the CSI-RS resources.

[0104] In some embodiments, the user equipment performs beam measurement based on the SSB resource configured by the candidate cell, and the user equipment also performs beam measurement based on the CSI-RS resource configured by the candidate cell. In some embodiments, a quasi co-location (QCL) mapping relationship is satisfied between the SSB resource and the CSI-RS resource. In some embodiments, the reporting of the measurement result of the user equipment includes measurement result reporting based on the SSB resource and / or measurement result reporting based on the CSI-RS resource. In some embodiments, the user equipment performs layer-1 SSB and CSI-RS based measurement result reporting in a first level reporting and a second level reporting manner, the first level reporting includes reporting based on the measurement result of the SSB resource, and the second level reporting includes reporting based on the measurement result of the CSI-RS resource. In some embodiments, the reporting information of the first level reporting includes index information of the candidate cell, layer-1 reference signal received power (L1-RSRP) information obtained by the candidate cell based on SSB measurement, and / or index information (SSBRI) of the SSB resource.

[0105] In some embodiments, based on the first level reporting information, the first level reporting information includes measurement information of L candidate cells and / or M beams under each candidate cell, and L and M are any one of {1, 2, 3, 4}. In some embodiments, the reporting information of the second level reporting includes index information of the candidate cell, L1-RSRP information and / or L1-SINR information obtained by the candidate cell based on CSI-RS measurement, and / or index information (CRI) of the CSI-RS resource. In some embodiments, if the reporting information of the first level reporting includes index information of the candidate cell, the index information of the candidate cell in the reporting information of the second level reporting is a subset of the index information of the candidate cell in the reporting information of the first level reporting. In some embodiments, the reporting information of the first level reporting and / or the reporting information of the second level reporting supports periodic, aperiodic, and / or semi-persistent reporting. In some embodiments, the reporting information of the first level reporting and / or the reporting information of the second level reporting is carried on a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

[0106] The present application proposes a mechanism for candidate cell CSI-RS based beam measurement and L1-SINR reporting, which reduces the overhead of CSI-RS measurement and reporting by flexible CSI-RS resource configuration and reporting manner, and improves the efficiency of handover decision. The present application considers to support periodic, semi-persistent and aperiodic CSI-RS measurement and reporting, and the specific workflow is shown in FIG. 1C:

[0107] The workflow of FIG. 1C includes at least one of the following steps:

[0108] 1. The network sends a parameter configuration message to the UE: the base station sends a parameter configuration message to the UE, which contains the CSI-RS and CSI-IM resource configuration information of the candidate cell. These resource configurations need to meet the constraints of time domain, frequency domain, and pattern, etc. For example, the candidate cell and the serving cell should use the same CSI-IM pattern, and the measurement resources of multiple cells should meet certain time domain constraints in time, such as in the same time window or adjacent slots. The parameter configuration message can be an RRC reconfiguration message. For details, see the sixth embodiment.

[0109] 2. The UE feeds back a parameter configuration completion message to the network side: after receiving the parameter configuration message, the UE feeds back a parameter configuration completion message to the base station, confirming that the configuration has been completed.

[0110] 3. The UE measures the SSB of the candidate cell.

[0111] 4. The UE sends SSB-based measurement reporting to the network side: the terminal reports status information to the base station based on the SSB measurement results. This reporting information can be used to trigger the candidate cell to issue semi-persistent or aperiodic CSI-RS measurement resources, or to trigger the reporting of CSI-RS measurement information. The reporting content can include: candidate cell index, SSB beam index, L1-RSRP information of SSB beam measurement, single-bit synchronization state indication, etc. For details of the reporting form and content, see the first embodiment.

[0112] 5. The network side sends semi-persistent or aperiodic CSI measurement or reporting trigger to the UE: the base station triggers the CSI-RS measurement or reporting of the candidate cell according to the received reporting information, which can be divided into the following cases: periodic CSI-RS measurement, semi-persistent or aperiodic reporting: based on the SSB measurement reporting information to determine the CSI-RS reporting of the candidate cell, the base station triggers the reporting behavior. Semi-persistent or aperiodic CSI-RS measurement: semi-persistent CSI-RS measurement resources are triggered by MAC CE. Currently, MAC CE does not support activating / deactivating semi-persistent CSI-RS resources, and related messages need to be adapted. For details, see the second embodiment. In addition, semi-persistent and aperiodic CSI-RS resources are issued by the candidate cell, and the activation message is issued by the serving cell. The serving cell may need to send a request to the candidate cell, and based on the response of the candidate cell, the activation signal is issued. The effective time of the semi-persistent CSI-RS resource activation signal in the standard may need to be adjusted, see the second embodiment.

[0113] 6. The UE measures the CSI-RS of the candidate cell.

[0114] 7. UE reports CSI-RS measurement results to the network side: the terminal reports L1-SINR information to the base station based on CSI-RS measurement, which is used for the base station to make handover decisions. The reporting content can include candidate cell index, CSI-RS resource index and measured L1-SINR information. The reporting mechanism can be selected based on the following ways: only report the beams that have QCL (Quasi Co-Location) relationship with SSB. The number of CSI-RS resources configured by the base station is further selected by the terminal based on the SSB QCL relationship. The base station indicates the number of reported beams, and the terminal selects part of the beams for reporting according to the indication. See the first embodiment for details.

[0115] 8. The network side sends LTM cell handover command to the UE: the base station issues a handover command to the terminal based on the L1-SINR measurement results, instructing the terminal to switch to the target cell. The handover command may contain beam selection indication information of the candidate cell.

[0116] Optional steps: not all steps must be performed, the specific process depends on the time domain behavior of CSI-RS (periodic, semi-persistent or aperiodic). Not all steps are necessary, and not all steps are the interaction between the terminal and the network side.

[0117] In summary, through the scheme of the present application, the CSI-RS beam measurement and L1-SINR reporting process based on candidate cells can improve the handover efficiency and communication performance. The CSI-RS measurement and reporting mechanism supports multiple time domain behaviors, flexibly adjusts the reporting content, reduces the overhead, and ensures efficient data transmission after handover.

[0118] (2) Event-triggered measurement result reporting mechanism.

[0119] In some embodiments, the flowchart of the mobility management method provided by the application embodiment of FIG. 2A is a measurement result reporting method based on event triggering, executed on a user equipment, including: operating 201A configuration information sent by the network side, the configuration information including at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, event-based reporting configuration information, and measurement reference resource configuration information of the candidate cell satisfying certain constraints, operating 202A layer one measurement based on the configuration information to obtain layer one measurement quantities, and operating 203A: determining whether to perform event-triggered reporting based on defined trigger events. The network side can refer to the current serving cell, the candidate cell, the primary serving cell or the secondary cell.

[0120] In some embodiments, the measurement resource of the serving cell and / or the measurement resource of the candidate cell comprises a synchronization signal block (SSB) resource and / or a channel state information reference signal (CSI-RS) resource. In some embodiments, the measurement quantity of the L1 comprises a layer one reference signal received power (L1-RSRP) and / or a layer one signal to interference noise ratio (L1-SINR). In some embodiments, the reporting content of the event-triggered reporting is carried in a medium access control control element (MAC CE) or a downlink control information (DCI) based on a defined triggering event. In some embodiments, the defined triggering event comprises an event LTM2, an event LTM3, an event LTM4, an event LTM5, an event LTMX, and other similar events, which refer to other similar events triggered by beams of the candidate cell and beams of the serving cell simultaneously. In some embodiments, the mechanism of the event-triggered reporting is as follows: only reporting the cell and / or beam information of the triggering event; the network side configures the number of reported cells and / or beams, and the terminal further selects based on the number configured by the network side based on the reported beam information of the triggering event; or the terminal selects the reported cell and / or beam measurement information based on the number of reported cells and / or beams configured by the network side. In some embodiments, the reporting quantity comprises at least one of the following reporting quantities: an event type, a candidate cell index, a reference resource index, an L1-RSRP or L1-SINR obtained by reference resource measurement, and reporting configuration ID information. In some embodiments, if the reporting quantity comprises measurement results of multiple cells, the priority of the reporting quantity of different cells is determined according to the cell index, the event, or the event type. In some embodiments, the event reporting based on L1 measurement and the CSI reporting based on CSI-RS are combined, and the CSI reporting is determined based on the network side configuration, predefined, or selected by the user equipment.

[0121] The present application proposes an event-triggered measurement result reporting mechanism, aiming to improve cell switching performance and reduce switching delay. By triggering cell switching decision based on L1 measurement events, combining L1-RSRP / L1-SINR information, and defining LTM2-LTM5 events based on L2, a more efficient switching process is achieved. The event-triggered switching process is shown in FIG. 2B, and the specific process is as follows:

[0122] The workflow of FIG. 2B comprises at least one of the following steps:

[0123] 1. The network side sends a parameter configuration message to the UE: the base station sends a parameter configuration message containing LTM candidate configuration to the terminal. The message includes resource configuration information of the corresponding L1 measurement quantity and possible measurement quantity reporting configuration information, similar to the reference resource configuration constraint in technical solution (1). The parameter configuration message can be an RRC reconfiguration message.

[0124] 2. UE feeds back parameter configuration completion message to network side: after receiving the parameter configuration message, the terminal feeds back parameter configuration completion message to the base station to confirm the successful configuration. The parameter configuration completion message can be RRC reconfiguration completion message.

[0125] 3. UE performs L1 measurement on the serving cell and candidate cell and makes event decision.

[0126] 4. Report event triggered report result.

[0127] 5. Semi-persistent or aperiodic CSI measurement or report trigger.

[0128] 6. Report measurement result.

[0129] 7. LTM cell switching command.

[0130] The above steps are not all necessary, and the above steps are not all the steps of the terminal and the network side interaction.

[0131] In detail, in some embodiments of the present application, event-triggered measurement and reporting: the terminal measures the reference resource and determines the reporting content based on the decision result of the event. The specific scheme of event-triggered reporting involves reporting mechanism, definition of event cells and beams, reporting quantity and its priority, etc. Reporting mechanism: the reporting mechanism can include the following ways: only reporting the cells and beams of the triggering event. Based on the triggering event beam, the network configures the number of beams for further selection. The terminal autonomously selects the number of reported beams and event beams: different event types correspond to different reporting mechanisms and reporting quantities, see the seventh and ninth embodiments for details. Definition of event beams and cells: the definition of different events (such as LTM3 and LTM5) may be different. It needs to be clear whether the serving cell is an event cell and which beams under the serving cell are event beams. See the seventh embodiment for details. Reporting quantity: the reporting quantity at least contains one of the following information: event type, candidate cell index, reference resource index, L1-RSRP or L1-SINR information of reference resource measurement. At the same time, the form of reporting quantity also needs to be defined, see the seventh and ninth embodiments for details. Event reporting priority: in order to deal with the situation that the terminal's reporting resources are limited, especially when multiple events are triggered at the same time, the number of reported candidate cells or beams may exceed the preset or configured range, so it is necessary to prioritize the events. The priority scheme can be set according to cell index, event, event type, etc., see the eighth embodiment for details. Carrying of CSI reporting information: distinguish whether the CSI reporting information is carried by MAC CE or UCI through the SR request message, and decide to use MAC CE or UCI carrying according to the number of reported cells, the type of events met, etc., and inform the network of the required resource level. See the tenth embodiment for details.

[0132] In detail, some embodiments of the present application provide an event-triggered reporting mechanism for the terminal to manage energy efficiency information or energy consumption information in a communication network. Specifically, the reporting mechanism can be implemented in at least one of the following ways: first, the terminal only reports the cells and beams of the triggering event, and the network side can further select the number of cells and beams to be reported according to the configuration; or the terminal determines the specific number of reporting and selects it according to the triggering event beam. It should be noted that different event types may correspond to different reporting mechanisms and reporting quantities, see the seventh and ninth embodiments for details.

[0133] The definition of event beams and cells may be different for different event types. For example, in LTM3 and LTM5 events, whether the serving cell is defined as an event cell and which beams in the serving cell are defined as event beams, see the seventh embodiment for details.

[0134] The reported quantity includes at least one of the following possible forms: event type, candidate cell index, reference resource index, and L1-RSRP or L1-SINR measured based on the reference resource. In addition, the specific form of the reported quantity is different. The reporting of the event type can be represented by a bitmap, an event index, or an event list corresponding to each cell. For details, see the seventh embodiment and the ninth embodiment.

[0135] Considering that the terminal has limited reporting resources and multiple events may be triggered at the same time, if the number of cells or beams to be reported exceeds the preset or configuration, the events need to be prioritized. The prioritization scheme can be based on cell index, event type, etc. For specific schemes, see the eighth embodiment.

[0136] In addition, some embodiments of the present application also provide a CSI reporting information carrying method, which distinguishes whether the CSI reporting information is carried by MAC CE or UCI through an SR request message. According to the number of reported cells and the types of events met, the terminal can further decide which carrying method to use or inform the network side of the required resource level. For details, see the tenth embodiment.

[0137] Base station triggering CSI-RS measurement or reporting: based on the reporting information of the terminal, the base station can trigger semi-persistent or aperiodic CSI-RS measurement or reporting. These CSI-RS measurement resources can be used for beam measurement or CSI measurement. The specific scheme is consistent with step (1) in the technical solution (1).

[0138] Combination of L1 measurement and CSI-RS measurement reporting: the terminal reports the measurement results to the base station based on CSI-RS measurement, which is divided into two cases:

[0139] Combination of L1 measurement event reporting and L1-SINR reporting of CSI-RS measurement: the reported quantity is similar to the CSI-RS-based measurement reporting in the technical solution (1).

[0140] Combination of L1 measurement event reporting and CSI reporting of CSI-RS measurement: the reported candidate cells and beams can be configured by the network side, predefined by the standard, or selected by the terminal, or a combination of multiple mechanisms. For details, see the third embodiment.

[0141] In detail, some embodiments of the present application provide a method of combining L1 measurement event reporting and CSI reporting based on CSI-RS, for determining specific reported candidate cell and beam information. The method can be based on network side configuration, standard predefinition or terminal selection, or a combination of the above mechanisms, as detailed in the third embodiment. Specifically, when the terminal detects an L1 measurement event that meets the triggering condition, the terminal will perform CSI measurement on the relevant CSI-RS resource based on the configured measurement resource or predefined rules, and select the candidate cell and beam information to be reported. The network side can manage and optimize the reporting of candidate cells and beams according to the configured information. If the network side does not make specific configurations, the terminal can select the optimal candidate cell and beam for reporting according to the current channel state. This mechanism that combines L1 measurement event and CSI-RS reporting can effectively improve the reporting efficiency of the terminal while ensuring network performance. This mechanism is applicable to various L1 event detection and CSI information reporting scenarios, and can flexibly adapt to network side configuration requirements and standardization rules, as detailed in the third embodiment. The purpose is to explain in detail how to combine the L1 measurement event reporting and the CSI-RS CSI reporting mechanism, and emphasize the flexibility and adaptability between different mechanisms.

[0142] The base station issues a handover command: Based on the L1-SINR measurement result and the CSI reporting, the base station issues a handover command to the terminal, instructing the terminal to switch to the target cell. The handover command may contain indication information for candidate cell beam selection.

[0143] The above steps are not all necessary to be performed, depending on whether the event reporting is combined with L1-SINR reporting or CSI reporting based on CSI-RS measurement.

[0144] In summary, the present application can effectively improve cell handover performance, reduce handover delay and enhance the robustness of handover by combining the event-triggered L1 measurement reporting mechanism with CSI-RS measurement. Through the flexible reporting mechanism, event priority management, and joint bearing of MAC CE and UCI, the efficiency of the reporting process is ensured, and the communication resource overhead is reduced.

[0145] (3) CSI (Channel State Information) measurement and reporting under LTM (L1 / L2 triggered mobility).

[0146] In some embodiments, the mobility management method provided by the flowchart of Figure 3applicationembodimentprovides a mobility management method, executed in a user equipment, comprising: operation 301: receiving configuration information sent by a network side, the configuration information comprising at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, and measurement reference resource configuration information of the candidate cell satisfying certain constraints; and operation 302: performing CSI measurement and / or reporting of the candidate cell based on the configuration of the reference signal, wherein the CSI information of the candidate cell is reported before a handover command, or the CSI information of the candidate cell is reported after the handover command, or the CSI measurement and reporting of the candidate cell are performed after the handover command.

[0147] In some embodiments, satisfying certain constraints refers to satisfying at least one of time domain, frequency domain, and resource pattern constraints. In some embodiments, if the aperiodic channel state information reference signal (CSI-RS) is triggered based on a medium access control control element (MAC CE), the starting time of the processing time of the CSI is referenced to the last symbol of a physical downlink shared channel (PDSCH) carrying the MAC CE message. In some embodiments, the MAC CE carries content including the handover command, target cell beam indication information, and / or target cell aperiodic or semi-persistent CSI-RS resource activation information. In some embodiments, the user equipment reports CSI of multiple candidate cells based on a priority of CSI reporting before cell handover, and the priority of CSI reporting is determined based on at least one of an index (ID) of the candidate cell, RI information of CSI reporting of the candidate cell, wideband CQI information of CSI reporting of the candidate cell, a size of L1-RSRP or L1-SINR of beam measurement results reported by the candidate cell, and reporting overhead of the candidate cell. In some embodiments, the CSI reporting method further includes that, based on the LTM, before reporting the CSI, the user equipment receives an LTM cell handover command and / or CSI measurement and / or reporting activation message sent by the network side, wherein the activation message is used to activate CSI measurement and / or reporting. In some embodiments, the reported CSI includes CSI information corresponding to a beam pair of the candidate cell, wherein the CSI information corresponding to the beam pair of the candidate cell is reported based on L1 measurement and reporting of the beam, and the user equipment makes a further selection based on this; or the user equipment makes a selection based on configuration information of the network side; or the selection is completely dependent on the user equipment. In some embodiments, the reported CSI includes at least one of event ID, Cell ID, CRI, PMI, RI, and CQI; the reporting mode is one or more reporting instances, and the maximum number of cells and / or the number of CSI corresponding to CSI-RS resources in each reporting instance are constrained.

[0148] The present application proposes two possible ways for CSI (channel state information) measurement and reporting under LTM (L1 / L2 triggered mobility) to improve handover performance and reduce latency:

[0149] CSI feedback before the base station issues a handover command: before handover, the terminal feeds back CSI information to the base station, and the base station makes a handover decision using this information. The corresponding process is shown in FIG. 4A.

[0150] CSI measurement and handover command are sent at the same time: the base station triggers CSI reporting at the same time when sending handover command, to realize fast CSI feedback of target cell, and the corresponding process is shown in FIG. 4B.

[0151] As shown in FIG. 4A, the specific process of CSI reporting mechanism is as follows: 1. sending parameter configuration message, 2. feeding back parameter configuration completion message

[0152] 3. UE performs CSI-RS measurement on serving cell and candidate cell, 4. reporting CSI information obtained by measurement, 5. LTM cell handover command and CSI measurement and / or triggering message. The above steps are not all necessary, and the above steps are not all steps of terminal and network side interaction.

[0153] Sending parameter configuration information: the base station sends parameter configuration information containing LTM candidate configuration to the terminal, and the message includes resource configuration information of L1 measurement quantity and configuration information of CSI reporting. The configuration information can be similar to the reference resource configuration constraint in technical solution (1). The parameter configuration message can be an RRC reconfiguration message.

[0154] Parameter configuration completion message: after receiving the parameter configuration information, the terminal feeds back the parameter configuration completion message to the base station, to confirm that the configuration has been completed. The parameter configuration completion message can be an RRC reconfiguration completion message.

[0155] Reporting of CSI information: the terminal reports CSI information to the base station according to the measurement result, including: determination of reporting quantity: reporting CSI information of which candidate cell and corresponding beam information. The reporting quantity can be based on the beam determined by L1 measurement, and the terminal can further select on this basis, or select based on the content configured by the network side, or completely select by the terminal itself, for details, see the third embodiment.

[0156] Reporting content and method: the reporting content at least includes one of the following information: cell ID (Cell ID), channel reference index (CRI), precoding matrix index (PMI), rank indication (RI), channel quality indication (CQI). The reporting method can be single or multiple reporting instances, and the number of CSIs corresponding to the largest cell or CSI-RS resource in each instance is restricted, for details, see the third embodiment.

[0157] Constraint of reducing reporting overhead: considering the coherence between multiple beams, multiple beams can use the same rank value (Rank), and the constraint of sub-band granularity, the number of supported antenna ports, the number of beams supported by each cell, etc. For details, see the third embodiment.

[0158] CSI processing time and CPU computation requirement: the terminal needs to process the CSI information of multiple candidate cells, so the CSI processing time and CPU computation capability defined in the existing standard need to be adapted. See the fifth embodiment for details.

[0159] CSI reporting priority: the priority of CSI reporting can be based on the index of the candidate cell, the feedback rank value (Rank), reporting overhead, and other factors. See the fourth embodiment for details.

[0160] In detail, some embodiments of the present application propose a mechanism for determining the reporting amount, specifically including the CSI information of the reported candidate cell and its corresponding beam. Some embodiments of the present application describe in detail the determination of the reporting amount, the reporting content and method, the reduction mechanism of the reporting overhead, and the setting of the CSI reporting priority, providing a flexible and efficient solution for reporting based on L1 measurement events. The determination of the reporting amount can be carried out in the following ways:

[0161] Beam determination based on L1 measurement reporting: the CSI information of the candidate cell can be first determined based on the beam reported by L1 measurement. The terminal can select the beam to be reported according to the measurement result of the L1 event.

[0162] Further selection by the terminal: on this basis, the terminal can further select according to the current channel state or other factors to determine the candidate cell and beam to be reported.

[0163] Based on network side configuration information: the terminal can also select the candidate cell and CSI information to be reported according to the configuration information sent by the network side.

[0164] Terminal autonomous selection: in the case where no specific configuration information is received from the network side, the terminal can completely autonomously select the candidate cell and beam to be reported.

[0165] Reporting content and method: the reporting content includes at least one or more of the following information: Event ID, Cell ID, CRI, PMI, RI, CQI. The reporting method can include one or more reporting instances. The maximum number of cells and / or the number of CSI corresponding to CSI-RS resources under each reporting instance are subject to certain constraints to ensure efficient allocation of resources. See the third embodiment for details.

[0166] Constraints for reducing reporting overhead: to reduce the reporting overhead, the system can introduce the following constraint conditions:

[0167] Coherence between beams: considering that multiple beams can have similar rank values (Rank), the same rank value (Rank) can be used to reduce redundancy.

[0168] Sub-band granularity and number of antenna ports: The reporting can be constrained according to the sub-band granularity, the number of supported antenna ports, and the number of beams supported by each cell, etc., to optimize the utilization of resources. The specific implementation details can be referred to the third embodiment.

[0169] CSI reporting priority: The priority of CSI reporting can be determined based on the following factors:

[0170] Candidate cell index: The priority of reporting can be sorted according to the index of the candidate cell, and the candidate cell with a smaller or larger index is reported first.

[0171] Feedback rank value (Rank): The CSI reporting priority can also be determined according to the feedback rank value (Rank) of the candidate cell.

[0172] Feedback overhead: The priority can also be determined based on the feedback overhead, i.e., the cell that requires less resources can be reported first. The specific CSI reporting priority mechanism can be referred to the fourth embodiment.

[0173] Handover command issuance: The base station issues a handover command to the terminal according to the CSI information reported by the terminal, instructing the terminal to switch to the target cell. The handover command can include beam selection information of the target cell.

[0174] In detail, some embodiments of the present application propose the content of the handover command and MAC CE message issued by the base station. Some embodiments of the present application propose a method of carrying the handover command through MAC CE, focusing on the content carried by the MAC CE message and the impact on the starting time of CSI processing time. Mainly including the following points:

[0175] MAC CE carrying content: Handover command: The MAC CE message contains the command to switch to the target cell.

[0176] Target cell beam indication information: including beam configuration and related indication information of the target cell.

[0177] Aperiodic or semi-persistent CSI-RS resource activation information: The MAC CE message also contains the activation information of the aperiodic or semi-persistent CSI-RS resource of the target cell, which is used to trigger the CSI measurement of the candidate cell. The specific implementation can be referred to the third embodiment.

[0178] Definition of the starting time of CSI processing time: For traditional aperiodic CSI-RS measurement, it is usually triggered by DCI, and the starting time of processing time is calculated from the DCI trigger.

[0179] When the non-periodic CSI-RS measurement of the candidate cell is triggered by the MAC CE message, the application proposes to define the starting time of the CSI processing time according to the PDSCH end symbol carrying the MAC CE message, specifically Z and Z'. This processing method ensures the timing accuracy and efficiency of CSI measurement in the handover process. The specific starting time definition and operation steps can be referred to the fifth embodiment.

[0180] Through the above method, some embodiments of the application effectively improve the activation of the CSI-RS resource and the management of the CSI processing time in the handover process, and improve the flexibility and timeliness of the non-periodic CSI-RS measurement.

[0181] In summary, the determination of the reporting quantity: the reporting of the CSI information of the candidate cell and its beam can be based on the L1 measurement result, the terminal selection or the network side configuration. The reporting content and method: the content includes cell ID, CRI, PMI, RI, CQI, etc., supports multiple reporting instances, and the reporting quantity of each instance is constrained. Reduce the reporting overhead: reduce the redundant information of the reporting through the beam coherence, rank value sharing and other ways. CSI processing time and CPU requirement: the terminal needs to process the CSI information of multiple cells, and the processing time and CPU computing capacity need to be optimized. CSI reporting priority: set the priority based on the cell index, feedback rank value, reporting overhead, etc.

[0182] The execution of the above steps can be adjusted according to the time domain behavior of the CSI-RS, and some steps are the same as the processes in technical solution (1) and technical solution (2), which are not repeated here.

[0183] Through the flexible CSI reporting mechanism, the application can realize fast CSI feedback before or during handover in combination with the CSI measurement of the candidate cell, effectively reduce the handover delay, ensure that the terminal can perform efficient data transmission after switching to the target cell, and reduce the reporting overhead through priority management and reporting quantity optimization.

[0184] As shown in FIG. 4B, the specific process of the CSI reporting mechanism is as follows: the application proposes a handover process based on LTM (L1 / L2 triggered mobility), which carries the handover command through the MAC CE message, and affects the activation of the non-periodic CSI-RS resource of the target cell and the definition of the starting time of the CSI processing time. The specific steps are as follows: 1. sending parameter configuration message, 2. feeding back parameter configuration completion message, 3. UE performing L1 measurement on the serving cell and the candidate cell, 4. reporting beam measurement result, 5. LTM cell handover command and CSI measurement and / or triggering message, 6. reporting the CSI information obtained by measurement. The above steps are not all necessary, and the above steps are not all the steps of the terminal and the network side interaction.

[0185] Sending parameter configuration information: the base station sends parameter configuration information containing LTM candidate configuration to the terminal, and the message contains resource configuration information of L1 measurement quantity and possible measurement quantity reporting configuration information. This configuration information is similar to the reference resource configuration constraint in technical solution (1) and is applicable to this solution. The parameter configuration message can be an RRC reconfiguration message.

[0186] Parameter configuration completion message: after the terminal receives the parameter configuration message, it feeds back the parameter configuration completion message to the base station, informing the base station that the configuration has been completed. The parameter configuration completion message can be an RRC reconfiguration completion message.

[0187] Reporting of L1 measurement results: the terminal reports the measurement results to the base station according to L1 measurement. The reporting process is the same as the relevant steps in technical solutions (1) and (2), so it is not repeated here.

[0188] Switching command carried by MAC CE: the base station issues a switching command contained in a MAC CE message, focusing on the content carried by the MAC CE message and the adaptation of the CSI processing time. The specific content includes: switching command: contains the instruction for the terminal to switch from the source cell to the target cell. Target cell beam indication information: indicates the specific beam to which the terminal should switch in the target cell. Target cell aperiodic or semi-persistent CSI-RS resource activation information: if the target cell aperiodic CSI-RS resource is activated through the MAC CE, this activation information will affect the starting time of the CSI processing time.

[0189] Definition of the starting time of the CSI processing time: Traditional aperiodic CSI-RS measurement is usually triggered by DCI (downlink control information), so the definition of the starting time of the CSI processing time is based on the time point triggered by DCI. However, if MAC CE is used to trigger the aperiodic CSI-RS resource of the candidate cell, the starting time of the CSI processing time needs to be redefined and adapted to ensure the correctness of the measurement process. For details, refer to the fifth embodiment.

[0190] Reporting of CSI results: after switching to the target cell, the terminal reports the measured CSI results to the target base station. This step is the same as the traditional CSI reporting process, and is not repeated here.

[0191] The present application realizes the switching of the target cell and the flexible management of the CSI-RS resource by carrying the switching command, beam indication information and CSI-RS resource activation information in the MAC CE message. In particular, in the case of MAC CE triggering aperiodic CSI-RS, the starting time of the CSI processing time needs to be redefined to adapt to the new triggering method. Through this solution, the efficiency and performance of the switching process can be effectively improved, ensuring that the terminal can quickly and efficiently transmit data after switching.

[0192] To facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions related to the embodiments of the present application are described below. The technical solutions of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, and the tenth embodiment are described below, but the present application is not limited thereto.

[0193] In some embodiments of the present application, the scheme of the first embodiment can be implemented in combination with the schemes of the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, and / or the tenth embodiment, or can be implemented independently of the schemes of the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, and the tenth embodiment. In some embodiments of the present application, the schemes among multiple embodiments can be implemented in combination or independently.

[0194] First embodiment: beam measurement based on CSI-RS of candidate cell.

[0195] Some embodiments of the present application solve the following technical problems.

[0196] Technical problem: workflow and optimization scheme of candidate cell CSI-RS resource configuration and SSB synchronization joint measurement.

[0197] In the existing 5G NR system, when the terminal supports beam measurement based on CSI-RS (Channel State Information Reference Signal) measurement, the joint measurement and reporting mechanism of the CSI-RS resource configuration of the candidate cell and the SSB (Synchronization Signal Block) needs to be designed in detail to ensure the efficiency of measurement and beam measurement. The following are the key issues and solutions of this mechanism: CSI-RS resource configuration and activation: CSI-RS resource type: Currently, it is clear that the CSI-RS resource of the candidate cell needs to be explicitly configured. The CSI-RS resource can be periodic, semi-persistent, or aperiodic. Activation problem: For semi-persistent and aperiodic CSI-RS resources, the problem of resource activation needs to be considered. The activation of the CSI-RS resource is usually done by the serving cell, while the CSI-RS resource is issued by the candidate cell. Therefore, it is necessary to ensure the time alignment of the candidate cell and the serving cell to avoid synchronization problems in resource configuration and activation. Time alignment: The time alignment between the candidate cell and the serving cell is a key issue, especially in the cross-cell handover scenario, to ensure that the CSI-RS resource can be activated and issued in time and effectively, reducing the delay of beam switching and measurement. SSB and CSI-RS joint measurement and reporting mechanism: SSB synchronization and reporting optimization: If the candidate cell configures SSB for synchronization, basic downlink synchronization can be achieved through SSB. In this case, in order to reduce the overhead of measurement reporting, the network needs to determine when to trigger the measurement and reporting of CSI-RS according to the feedback information of the terminal, for different CSI-RS configuration modes of the candidate cell. Random access problem: Since the traditional NR random access process of the candidate cell has not been completed, the terminal will not send a Preamble signal, so the base station side does not know whether the terminal has completed downlink synchronization. In this case, the network may need to rely on the feedback information of the terminal to determine when to trigger the measurement and reporting of CSI-RS. Terminal feedback and network side triggering mechanism: Terminal reporting quantity: When performing CSI-RS measurement, the terminal may need to report L1 measurement quantities such as L1-RSRP (Reference Signal Received Power), L1-SINR (Signal-to-Noise Ratio), etc. The content of the report can also include the terminal's synchronization status to the candidate cell, the measurement result of the current CSI-RS, and whether more CSI-RS resources need to be further activated. Resource issuance and measurement triggering based on terminal feedback: The network side determines whether to trigger the candidate cell to issue more CSI-RS measurement resources or perform L1 measurement quantity reporting based on the information reported by the terminal. This process may need to be optimized in combination with the joint measurement results of the terminal on SSB and CSI-RS, such as triggering further CSI-RS measurement and reporting when determining beam quality improvement. Workflow design: Preliminary synchronization: The candidate cell configures SSB for synchronization, and the terminal completes preliminary downlink synchronization through SSB.CSI-RS configuration and activation: After synchronization is completed, the network side explicitly configures CSI-RS resources for the terminal, and activates periodic, semi-persistent, or aperiodic CSI-RS resources according to network load and beam measurement requirements. Terminal feedback and CSI-RS measurement triggering: After the terminal synchronizes with the SSB, it performs preliminary measurement of the CSI-RS according to network configuration, and reports L1-RSRP and / or L1-SINR measurement results through UCI. Based on the feedback of the terminal, the network side decides whether to further activate more CSI-RS resources or adjust the beam. Beam switching and resource delivery: When the terminal reports that the quality of the new candidate beam is better than the current beam, the network side can trigger beam switching and, if necessary, deliver more CSI-RS resources through the serving cell. Time-frequency domain constraints and optimization: Time-frequency resource coordination: In order to ensure the effectiveness of beam measurement, the CSI-RS resources of candidate cells and the SSB resources of the serving cell need to be effectively coordinated in the time-frequency domain to avoid resource conflicts. At the same time, it is necessary to ensure that the CSI-RS measurements between different candidate cells have a relatively consistent time interval to ensure the accuracy of the measurement data. In summary, the candidate cell SSB and CSI-RS joint measurement and reporting mechanism needs to be optimized in terms of resource configuration, terminal feedback, and time alignment to ensure the efficiency and accuracy of beam measurement. Through reasonable resource allocation and measurement triggering mechanism, the network's beam switching performance can be greatly improved, and the measurement overhead and delay can be reduced.

[0198] In this embodiment, the beam measurement based on the CSI-RS (Channel State Information Reference Signal) of the candidate cell is mainly discussed, and the reporting quantity of the beam measurement can be L1-RSRP (Reference Signal Received Power) or L1-SINR (Signal to Noise Ratio). In order to ensure the accuracy of the CSI-RS measurement, synchronization needs to be performed first. This embodiment assumes that the synchronization information of the candidate cell itself is used in the measurement of the candidate cell. Based on this, the following are several feasible schemes:

[0199] 1. Synchronization based on the SSB of the candidate cell: In this scheme, the candidate cell provides synchronization information through its own SSB (Synchronization Signal Block). After receiving the SSB of the candidate cell, the terminal uses its synchronization information to perform CSI-RS measurement, ensuring the accuracy of the measurement. The characteristics of this scheme include: synchronization reliability: Using the synchronization information of the candidate cell, the CSI-RS of the candidate cell can be measured more accurately, avoiding measurement errors caused by time synchronization differences between different cells. Measurement process: The terminal first synchronizes with the SSB of the candidate cell, then performs CSI-RS measurement, and reports L1-RSRP or L1-SINR.

[0200] 2. Candidate cell independent measurement and reporting: In this scheme, the terminal performs independent measurement on the CSI-RS of the candidate cell, and does not rely on the synchronization information of the serving cell. The specific implementation process is as follows: Synchronization stage: The terminal first completes synchronization according to the SSB of the candidate cell. CSI-RS measurement stage: After synchronization is completed, the terminal measures the CSI-RS resource of the candidate cell to ensure the accuracy of L1-RSRP or L1-SINR measurement. Reporting stage: The terminal reports the measurement result to the base station. The reporting content can be L1-RSRP or L1-SINR, and the corresponding beam information.

[0201] The advantages of this scheme are: high flexibility: the terminal does not need to rely on the synchronization information of the serving cell, and can flexibly perform measurement and reporting of the candidate cell. Reduce dependence: by directly using the synchronization information of the candidate cell, the dependence on the serving cell is reduced, and the propagation of synchronization error is avoided.

[0202] Scheme one describes that the network side configures SSB measurement resources and CSI-RS measurement resources for the candidate cell, and the UE performs beam measurement based on these resources, thereby ensuring time domain and frequency domain synchronization with the candidate cell. In order to reduce the overhead of measurement and reporting, at least one of the following ways can be used for reporting:

[0203] 1. Prioritize L1-RSRP measurement and reporting based on SSB: Method: Since SSB measurement resources can be used for L1-RSRP measurement, the UE can first use SSB resources to measure and synchronize the beam. Based on the measurement result of SSB, the UE can directly report the L1-RSRP value, reducing the measurement and reporting overhead based on CSI-RS. Advantage: Periodic measurement of SSB has low signaling overhead, which is suitable for prioritizing the use of this resource for reporting when time domain and frequency domain synchronization is required. Applicable scenario: When the SSB measurement result is accurate enough and can meet the synchronization requirement, the dependence on CSI-RS resources can be reduced.

[0204] 2. Joint reporting of SSB and CSI-RS measurement results: Method: If the SSB and CSI-RS resources have QCL (Quasi Co-Location) relationship, the UE can perform supplementary measurement of CSI-RS based on the measurement result of SSB, and jointly report the L1-RSRP measurement results of SSB and CSI-RS. This way allows the network to make more accurate beam measurement decisions based on the joint measurement data of SSB and CSI-RS. Advantage: By utilizing the QCL relationship, the UE can avoid repeated measurement of resources, while reporting more comprehensive beam measurement information, improving the decision-making ability of the network. Applicable scenario: Suitable for scenarios where SSB and CSI-RS have close association and the measurement results need to be complementary.

[0205] 3. Report only the measurement result of CSI-RS: Method: For the periodic, semi-persistent or aperiodic CSI-RS measurement resource configured by the network, the UE can perform L1-RSRP or L1-SINR measurement based on the CSI-RS and report only the measurement result of the CSI-RS without reporting the SSB. This can reduce the redundancy when reporting multiple measurement resources. Advantage: Focus on using CSI-RS for measurement, reduce the reporting of SSB measurement, reduce the total reporting overhead, especially suitable for complex beam measurement scenarios. Applicable scenario: When the network mainly relies on CSI-RS for beam measurement or needs higher accuracy, it is suitable to report only the measurement result of CSI-RS.

[0206] 4. Prioritize the main reference resource in QCL relationship for reporting: Method: When SSB and CSI-RS resources have a one-to-many QCL relationship (i.e. one SSB beam corresponds to multiple QCL relationships of CSI-RS resources), the UE can prioritize the main reference resource in the QCL relationship for reporting. For example, the UE can select the strongest CSI-RS resource corresponding to the QCL relationship to report L1-RSRP or L1-SINR. Advantage: Reduce the reporting overhead of multiple QCL resources, only report the most representative measurement result, while not affecting the network's beam measurement decision. Applicable scenario: When multiple CSI-RS resources are associated with the same SSB beam, it is suitable to prioritize the most important resource for reporting to reduce redundancy.

[0207] 5. Event-triggered dynamic reporting mechanism: Method: The UE can use an event-triggered way to dynamically report L1-RSRP or L1-SINR measurement results. When the SSB or CSI-RS measurement of the candidate cell meets a certain event threshold (such as signal strength exceeding a certain threshold), the UE automatically triggers reporting. This mechanism can reduce unnecessary periodic reporting and reduce signaling overhead. Advantage: Through event triggering, unnecessary reporting is reduced, and only when the measurement result meets a certain standard does it trigger reporting, saving resources. Applicable scenario: Suitable for scenarios that need to reduce periodic reporting and optimize signaling resources.

[0208] 6. Optimal combination of reported resources: Method: When the network requires the UE to report the measurement results of SSB and CSI-RS at the same time, the UE can select the most important measurement result according to the priority indicated by the network. For example, the network can instruct the UE to report the strongest SSB and CSI-RS resources without reporting all measurement resources, thereby reducing the reporting overhead. Advantage: Through the indication of the network, the UE can intelligently select the combination of reported resources, reducing unnecessary reporting. Applicable scenario: Suitable for scenarios where the network indicates clear priority and needs to optimize resource utilization.

[0209] In order to reduce the reporting overhead of SSB and CSI-RS based beam measurement, the present embodiment provides multiple reporting methods, including preferentially using SSB measurement reporting, joint reporting, only reporting CSI-RS, event triggered dynamic reporting, etc. Through these reporting mechanisms, the signaling overhead can be effectively reduced under the premise of ensuring the accuracy of beam measurement, improving the efficiency of network resource utilization, and adapting to different application scenarios.

[0210] Method one: for periodic CSI-RS resources and periodic CSI reporting, the present application proposes a reporting method similar to Rel-18 SSB based beam measurement. Through RRC configuration, the terminal will report according to the number of candidate cells and beams indicated by the network, and the specific details are as follows:

[0211] 1. Reporting configuration and mechanism: candidate cell number L: through RRC signaling configuration, the network can indicate the number L of candidate cells reported by the terminal. The terminal selects L candidate cells for CSI reporting according to the measurement results. The number of beams M of each candidate cell: the network configures the number M of reference resources corresponding to the beams that need to be reported for each candidate cell through RRC signaling. The terminal reports the CSI measurement results of M beams for each candidate cell. Selected beams are reported through CRI: the terminal measures the L1-RSRP or L1-SINR of the selected beams, and reports the CSI measurement results of these beams using channel reference index (CRI). Reporting amount: the measurement amount reported can be L1-RSRP or L1-SINR, and the specific reporting amount depends on the requirements of network configuration. For each candidate cell, the measurement results of M beams are reported.

[0212] 2. Time interval between periodic CSI-RS resources and SSB measurement resources: time interval requirement: in order to ensure the consistency of the measurement results of CSI-RS and SSB, the start time of periodic CSI-RS resources needs to meet a certain time interval with the nearest SSB measurement resource. This interval is used to ensure the synchronization between the two, so that the terminal can accurately associate and measure CSI-RS and SSB. Predefined time interval: the time interval can be determined by network predefinition. For example, the standard can specify that the measurement of CSI-RS resources is triggered within a certain time after SSB measurement, in order to maintain the continuity of measurement. No time interval requirement: it can also be designed not to require that the SSB measurement resource and the CSI-RS resource meet a certain time interval, allowing the CSI-RS resource to be released independently of the SSB measurement resource. In this case, the terminal can independently measure SSB and CSI-RS, and report the measurement results respectively.

[0213] 3. Reporting mode: Periodic reporting: Based on periodic CSI-RS resources, the terminal will report L1-RSRP or L1-SINR according to the configured periodicity. The periodic reporting mechanism ensures that the network can periodically obtain the beam measurement results of the candidate cells for optimizing beam measurement and handover decision. Flexibility of reporting: The number of reported candidate cells L and the number of beams M for each cell are configurable. The network can adjust these parameters according to the actual load situation, channel conditions and resource allocation strategy to optimize reporting overhead and network performance.

[0214] 4. Application scenarios: Frequent reporting scenarios: This mode is suitable for scenarios where CSI measurement and beam measurement are frequently performed, such as when the terminal moves quickly or handover is frequent. Periodic reporting helps the network to continuously monitor the beam quality of candidate cells. Reporting optimization for static scenarios: For relatively stable channel environments, the network can reduce unnecessary reporting by extending the measurement period of periodic CSI-RS, thereby reducing network signaling overhead.

[0215] By configuring periodic CSI-RS resources and periodic CSI reporting, the invention proposes a reporting mode similar to Rel-18 SSB-based beam measurement. The terminal performs CSI reporting according to the number of candidate cells L and the number of beams M configured by the network. The reported quantities include L1-RSRP or L1-SINR, and the specific beam measurement results are indicated by CRI. The starting time of periodic CSI-RS resources can be predefined according to the time interval of SSB measurement resources to ensure synchronization, or it can be measured independently. Through this flexible configuration and reporting mode, beam measurement can be effectively optimized and network performance can be improved.

[0216] Mode two: For periodic CSI-RS measurement resources, the invention proposes a two-level reporting mode, which is suitable for semi-persistent or aperiodic reporting of CSI. This mode combines SSB and CSI-RS measurement to provide a flexible reporting mechanism to ensure the accuracy of beam measurement and the efficiency of reporting.

[0217] Primary reporting: SSB measurement result-based reporting: In the first level of reporting, the terminal first reports based on the measurement results of SSB. The specific reporting information can include the following items: index information of candidate cells, L1-RSRP information of candidate cells based on SSB measurement, index information of SSB resources (SSBRI), and the terminal can report at least one of the above information.

[0218] Reporting configuration: L (number of candidate cells) and M (number of beams per cell): The network side can configure L and M through RRC. If L is configured by default, the terminal reports all candidate cells, and if M is configured by default, the terminal reports all beams. L and M can also be determined by the terminal, and the terminal can report these numbers in an explicit or implicit manner. Reporting content simplification: The terminal can only report the beam index information corresponding to the maximum L1-RSRP of the candidate cell L1-RSRP, or report the index information of the M beams with larger L1-RSRP of the candidate cell.

[0219] Reporting method: association of SSBRI and L1-RSRP: the terminal can directly inform the network side of the selection of candidate cells and beams by reporting SSBRI or L1-RSRP bitmap information, thereby triggering the network side to further issue CSI-RS resources. Reporting under QCL relationship: when there is a QCL relationship between SSB and CSI-RS resources, the terminal can use a simple 1-bit to inform the network side and indicate the available CSI-RS measurement information.

[0220] Secondary reporting: CSI-RS measurement-based reporting: after the first-level reporting is completed, the network side triggers the terminal to perform semi-persistent or aperiodic CSI reporting based on the feedback information. The secondary reporting is triggered by MAC CE or DCI, and the specific reporting information includes: index information of the candidate cell, L1-RSRP information or L1-SINR information obtained by the candidate cell based on CSI-RS measurement, and index information (CRI) of the CSI-RS resource.

[0221] Reporting configuration: QCL relationship: when there is a QCL relationship between SSB and CSI-RS resources, the CSI-RS measurement result in the secondary reporting should be associated with the SSB resource in the first-level reporting. For example, the reported CRI has a QCL relationship with the CSI-RS resource of the SSB resource in the first-level reporting. Non-QCL relationship: if there is no QCL relationship between SSB and CSI-RS resources, the second-level reporting can select the candidate cell in the first-level reporting, and report the corresponding CSI-RS resource for each candidate cell.

[0222] Flexibility of reporting: dynamic selection of reported cells and beams: the terminal can select which candidate cells and beam CSI-RS resources under each cell to report based on the indication of the network side. Mapping of CRI and L1-SINR: in the secondary reporting, the terminal can first report the CRI information, and then report the corresponding L1-SINR information.

[0223] Parameter configuration: values of L and M: the L and M parameters of the secondary reporting can be configured by RRC to adapt to the reporting needs of different network environments.

[0224] Supported reporting mechanism: periodic, aperiodic and semi-persistent reporting: the terminal supports three reporting types, and the reporting content can be carried on PUCCH or PUSCH. Periodic and semi-persistent reporting is suitable for PUCCH, aperiodic and semi-persistent reporting is suitable for PUSCH. UCI and MAC CE carrying: reporting information can be carried by UCI, or through MAC CE message to realize flexible triggering and carrying.

[0225] Advantages of the scheme: flexible two-level reporting mechanism: the first level reporting is carried out through SSB measurement results, and the network triggers the second level reporting of CSI-RS measurement according to the feedback information. In this way, unnecessary measurement overhead can be reduced, and the accuracy of reporting can be ensured. Reporting optimization based on QCL relationship: if there is a QCL relationship between SSB and CSI-RS, the terminal can reduce redundant measurement and reporting, and directly report the associated resources to improve efficiency. Adapt to various reporting needs: support periodic, aperiodic and semi-persistent reporting mechanism, which can be flexibly adjusted according to network load and scene demand.

[0226] The present application proposes a two-level reporting mechanism, which improves the efficiency of beam measurement and CSI reporting through the combination of SSB and CSI-RS resources. Through reasonable L and M parameter configuration and reporting trigger mechanism, the terminal can dynamically adapt to network demand, reduce measurement and reporting overhead, and improve overall network performance.

[0227] Method three: for semi-persistent CSI-RS measurement resources, the trigger mechanism depends on the trigger of the signal, and specific triggering of which candidate cells and corresponding CSI-RS measurement resources can be determined based on the first level reporting information in method two. The following are the specific details of this scheme:

[0228] Semi-persistent CSI-RS measurement resource triggering and reporting: candidate cell triggering based on first level reporting information: the network determines which candidate cells to trigger to issue CSI-RS measurement resources based on the first level reporting information of the terminal. For example, the first level reporting information includes the index of the candidate cell, the SSB beam, etc., and the network side can select to trigger the related CSI-RS measurement resources according to these information.

[0229] Utilization of QCL relationship: in the triggering of semi-persistent and aperiodic CSI-RS measurement resources, those CSI-RS resources with QCL (quasi co-location) relationship with the SSB resources in the first level reporting can be triggered first. In this way, redundant measurement can be reduced, and the effectiveness and accuracy of resource utilization can be ensured.

[0230] Triggering of semi-persistent and aperiodic CSI reporting: In CSI reporting, the terminal decides which CSI-RS measurements to report according to network triggering information. The network side can choose to trigger all CSI-RS measurement resources, or select to trigger part of the candidate cells and their CSI-RS measurement resources according to the first-level reported information, thereby reducing the reporting overhead.

[0231] The terminal can select to report the CSI information of part of the CSI-RS measurement resources according to the triggering information, to reduce the feedback overhead and signaling load.

[0232] Aperiodic CSI-RS measurement and reporting: Similarity of triggering mechanism with semi-persistent mode: The triggering mechanism of aperiodic CSI-RS measurement resources and CSI reporting is similar to the semi-persistent mode. The triggered candidate cells and CSI-RS measurement resources are also based on the first-level reported information, especially those CSI-RS resources that have QCL relationship with SSB resources.

[0233] Selection based on first-level reported information: The network can determine which CSI-RS measurement resources to trigger based on the first-level reported candidate cells and their SSB resources. At the same time, if the number of these CSI-RS resources that have QCL relationship with SSB resources is less than the number of candidate cells and beams configured by the network side, the network side can select other part of the CSI-RS resources of the candidate cells to trigger to meet the configuration requirements.

[0234] Simple triggering mechanism: In order to simplify the triggering process, the terminal can use a 1-bit indication to indicate to the network side which CSI-RS measurement resources of the candidate cells need to be triggered based on SSB measurement. After receiving the indication, the network can issue corresponding triggering information to perform the triggering and reporting of the CSI-RS resources.

[0235] Details of resource triggering: QCL relationship between SSB and CSI-RS resources: When there is a QCL relationship between SSB and CSI-RS resources, the network can preferentially trigger the candidate cells corresponding to these resources. This can reduce unnecessary measurement and reporting, and improve system efficiency.

[0236] Adjustment of the number of candidate cells and beams: If the number of candidate cells reporting CSI-RS measurement results and / or the number of beams per cell configured by the network side is greater than the number of CSI-RS resources that have QCL relationship with the SSB resources in the first-level reporting, the network can select part of the CSI-RS resources of the candidate cells to trigger to meet the configuration requirements.

[0237] Optimization of reporting process: 1-bit trigger indication: the terminal can indicate which candidate cell's CSI-RS measurement resource needs to be triggered by the network side through 1-bit. This simplifies the trigger process and reduces the complexity of signaling. Reduce feedback overhead: by selective reporting, the terminal can avoid reporting all CSI-RS measurement results, but only report part of the CSI according to the network side's indication, reducing the feedback overhead.

[0238] The third way of the present application proposes an optimization scheme for semi-persistent and aperiodic CSI-RS measurement and reporting. By triggering based on the first level of reporting information, especially using the QCL relationship between SSB resources and CSI-RS resources, unnecessary measurement and reporting are reduced. At the same time, the network can dynamically adjust the number of triggered candidate cells and beams to meet different configuration requirements. Through a simple 1-bit trigger indication, the interaction between the terminal and the network side is more efficient, reducing the signaling load and improving the overall performance of the system.

[0239] Way four: assuming that the network side has configured semi-persistent or aperiodic CSI-RS measurement resources, the present application proposes a mechanism for the terminal to actively apply for the issuance of CSI-RS measurement resources. Based on the application signal after the terminal synchronizes with the candidate cell, the network side triggers the issuance of CSI-RS measurement resources according to the application, and further triggers semi-persistent or aperiodic CSI reporting.

[0240] 1. Terminal application of CSI-RS measurement resources: after the terminal synchronizes with the candidate cell, the terminal actively applies for the issuance of CSI-RS measurement resources to the network side. The terminal will send candidate cell information to the network indicating the need to issue CSI-RS measurement resources.

[0241] Application signal content: index information of candidate cell: when applying, the terminal will report the index information of the candidate cell that needs to issue CSI-RS measurement resources. This index information can be indicated in two ways: bitmap (Bitmap) method: use bitmap to represent whether multiple candidate cells need to issue CSI-RS measurement resources, each bit corresponds to a candidate cell. Cell number method: the terminal directly reports the specific cell number (Cell ID) to indicate the candidate cell that needs to issue CSI-RS resources. Simplified 1-bit application mechanism: the terminal can also use a simplified 1-bit way to inform the network side, indicating that the candidate cell can issue CSI-RS measurement resources. This method is suitable for resource-limited or simple scenarios.

[0242] 2. Network side triggers the CSI-RS measurement resource to be issued: Trigger based on the terminal's application: After receiving the terminal's application signal, the network side triggers the semi-persistent or aperiodic CSI-RS measurement resource to be issued based on the candidate cell information provided by the terminal. The network side issues the corresponding CSI-RS measurement resource according to the cell index information or bitmap indication of the candidate cell in the terminal application. Flexible resource allocation: The network side can flexibly select the CSI-RS measurement resource to be issued to the terminal according to the load situation or resource usage. Based on the terminal's application, resources can be preferentially allocated to important cells or beams to optimize the allocation of network resources.

[0243] 3. Subsequent semi-persistent or aperiodic CSI reporting: Trigger for reporting: After the network side triggers the CSI-RS measurement resource to be issued, the terminal reports the semi-persistent or aperiodic CSI according to the trigger information from the network side. The reporting can include L1-RSRP or L1-SINR information obtained based on CSI-RS measurement.

[0244] Reporting content: Index information of candidate cells, L1-RSRP or L1-SINR information obtained based on CSI-RS measurement, and index information of CSI-RS resources (CRI).

[0245] 4. Flexible selection of multiple application methods: Bitmap indication: The terminal can use bitmap to flexibly indicate which candidate cells need CSI-RS measurement resources. After receiving the bitmap, the network triggers the CSI-RS resource allocation for related cells based on this information. Cell number indication: For simple scenarios, the terminal can directly report the cell number that needs CSI-RS resource allocation to reduce complexity. 1-bit indication: In some simplified scenarios, the terminal can notify the network side to issue CSI-RS measurement resources through 1-bit. This method is particularly suitable for resource-constrained or fast-response scenarios, reducing signaling overhead.

[0246] 5. Advantages of the scheme: Terminal initiative: This scheme allows the terminal to actively apply for the issuance of CSI-RS measurement resources after synchronization with the candidate cell, improving the terminal's control over resource scheduling and helping to optimize the timeliness of measurement and reporting. High flexibility: Through multiple application methods such as bitmap, cell number, and 1-bit notification, the terminal can flexibly choose the most suitable method for the current scenario. At the same time, the network side can also flexibly allocate resources based on the application information to ensure efficient resource utilization. Reducing unnecessary resource allocation: By the terminal's active application, the network can avoid blindly allocating CSI-RS measurement resources, reducing unnecessary resource waste, especially when the terminal has not yet synchronized with some candidate cells, the resource allocation is more targeted.

[0247] The fourth mode provides a mechanism for a terminal to actively apply for CSI-RS measurement resources. Through flexible application and triggering methods, the network can accurately trigger based on the real-time needs of the terminal during the delivery of semi-persistent and aperiodic CSI-RS measurement resources. The terminal can apply for resources through bitmap, cell number, or 1-bit indication, and the network can perform flexible resource scheduling and allocation based on the application information to further trigger CSI reporting. This mechanism not only reduces unnecessary resource delivery, but also improves resource utilization efficiency and enhances the coordination capability between the terminal and the network.

[0248] The fifth mode: For semi-persistent or aperiodic CSI-RS measurement resources, the present application proposes a mechanism based on SSB measurement to trigger CSI-RS resources. In this mode, after the terminal completes SSB measurement and obtains the synchronization information of the candidate cell, the network triggers semi-persistent or aperiodic CSI-RS measurement resources and subsequent CSI reporting. At this time, the time interval between the trigger signal of the CSI-RS measurement resource and the SSB measurement resource needs to meet certain requirements.

[0249] 1. SSB measurement and candidate cell synchronization: SSB measurement: The terminal first measures the SSB (synchronization signal block) of the candidate cell to obtain the necessary synchronization information, including time domain and frequency domain synchronization. This step ensures that the terminal can maintain good communication synchronization state with the candidate cell. Synchronization information acquisition: Based on SSB measurement, the terminal can synchronize with the candidate cell to provide a basis for subsequent CSI-RS measurement. This step is usually completed in periodic SSB measurement to ensure that the time domain and frequency domain of the candidate cell and the terminal are consistent.

[0250] 2. Triggering of CSI-RS measurement resources: Semi-persistent or aperiodic CSI-RS resource triggering: After the terminal completes SSB measurement and synchronization, the network triggers the delivery of semi-persistent or aperiodic CSI-RS measurement resources. Based on the synchronization state of the terminal, the network determines when to deliver CSI-RS measurement resources for further beam measurement and CSI reporting. Time interval requirement: The trigger signal of the CSI-RS measurement resource needs to meet a certain time interval with the latest SSB measurement resource. This time interval ensures that the terminal can perform CSI-RS measurement at the appropriate time after completing SSB measurement, avoiding time conflicts. Predefined time interval: The time interval can be predefined by standards or protocols to ensure consistency between all terminals and network devices. Flexible time configuration: The network side can also dynamically adjust the time interval according to specific scenarios and needs to adapt to different network conditions and load situations.

[0251] 3. Semi-persistent or aperiodic CSI reporting: Trigger for reporting: After the network triggers the CSI-RS measurement resource, the terminal reports the CSI based on the measurement results. This reporting can be semi-persistent or aperiodic, depending on the network configuration.

[0252] Reporting content: The reported content usually includes L1-RSRP or L1-SINR information obtained based on CSI-RS measurement, and may include index information (CRI) of the CSI-RS resource.

[0253] Index of candidate cell: The reported candidate cell and its beam measurement results are specified by the network side, and the terminal reports according to the trigger indication. Measurement results based on L1-RSRP or L1-SINR: The terminal can perform accurate measurement of the beam based on the CSI-RS measurement resource, and report the channel state information (CSI).

[0254] 4. Management of time interval: Predefined trigger interval: In order to ensure the continuity and effectiveness of SSB measurement and CSI-RS measurement, the time when the network triggers the CSI-RS measurement resource needs to maintain a reasonable time interval with the SSB measurement. This interval can be determined in the following two ways: Standard predefinition: The standard can specify that within a certain time window after SSB measurement, the CSI-RS resource is triggered to be issued. For example, the minimum or maximum interval between CSI-RS resource issuance and SSB measurement resource is specified to ensure time coordination. Dynamic adjustment: According to the actual situation of the network, the network side can flexibly configure this time interval to adapt to different communication scenarios. This can ensure the measurement and reporting performance of the terminal under different conditions.

[0255] 5. Advantages of the method: Synchronization guarantee: Through SSB measurement, the terminal can ensure synchronization with the candidate cell, thereby providing a reliable time and frequency domain synchronization basis for subsequent CSI-RS measurement. Time interval management: Through the pre-defined time interval, the conflict between the CSI-RS trigger signal and the SSB measurement resource is avoided, ensuring the coordination and continuity of the measurement process. Efficient resource utilization: The network can reasonably arrange the issuance of the CSI-RS measurement resource according to the synchronization state of the terminal and the SSB measurement result, optimizing the utilization rate of resources. Flexible triggering mechanism: The flexible triggering mechanism of semi-persistent and aperiodic CSI-RS measurement resource can adapt to different network loads and scene requirements, ensuring the flexibility and efficiency of beam measurement.

[0256] The fifth method proposes a semi-persistent or aperiodic CSI-RS measurement resource triggering mechanism based on SSB measurement, which ensures a reasonable time interval between CSI-RS measurement and SSB measurement. This mechanism can achieve efficient CSI reporting while maintaining candidate cell synchronization through reasonable triggering timing and flexible resource allocation. Through pre-defined time interval management, the network can effectively control the rhythm of CSI-RS measurement and reporting, improve the accuracy of measurement and the timeliness of reporting, while avoiding resource conflicts and improving system performance.

[0257] The sixth method: similar to the second method, this scheme considers periodic CSI-RS measurement resources and a triggering mechanism for semi-persistent or aperiodic CSI reporting, especially for terminal measurement based on the timing information of the candidate cell and the association relationship of SSB. When CSI-RS measurement depends on the timing information of the candidate cell, the terminal needs to obtain the timing information of the cell through SSB measurement to correctly perform CSI-RS measurement. In order to avoid unnecessary resource waste, the terminal can not report CSI-RS when it fails to obtain the timing information, and send a signal to the network side to inform whether to activate CSI reporting.

[0258] 1. Acquisition of timing information and QCL relationship: The terminal obtains the timing information of the candidate cell through SSB measurement and establishes a QCL (Quasi Co-Location) relationship with the CSI-RS of the candidate cell. In this way, the terminal can accurately measure the CSI-RS and ensure the time domain synchronization of the measurement results. Handling of missing timing information: If the terminal fails to obtain the timing information of the candidate cell, it will not perform CSI-RS measurement. In this case, the terminal needs to inform the network side to avoid resource waste caused by activating CSI reporting.

[0259] 2. Reporting triggering mechanism and signal activation: Activation signal of CSI reporting: Semi-persistent and aperiodic CSI reporting needs to be activated by the network side through a signal trigger. However, if the terminal fails to obtain the timing information of the candidate cell, directly activating CSI reporting may result in no effective measurement results for the terminal, thus wasting resources. Therefore, the terminal needs to inform the network side whether to start triggering CSI reporting through a request signal. Carrying of request signal: The terminal indicates to the network side whether to activate CSI reporting through a 1-bit signal. This signal can be carried in the following two ways: UCI (Uplink Control Information): The terminal can carry this request information in UCI to inform the network side whether to trigger CSI reporting. MAC CE (Medium Access Control Control Element): The terminal can also carry this information through MAC CE to deliver the request to the network side whether to perform CSI reporting.

[0260] 3. CSI reporting activation at network side: Request-based CSI reporting activation: After receiving the request signal from the terminal, the network side can issue a signal to activate semi-persistent or aperiodic CSI reporting if the terminal has obtained timing information. This activation message will instruct the terminal to start CSI reporting. Determination of CSI reporting quantity: The network side configures the terminal to select the number of candidate cells L and the number of beams M reported for each cell through RRC. The terminal selects L candidate cells and reports L1-SINR or L1-RSRP measurement information for M beams in each cell according to the configuration.

[0261] 4. Time interval management between periodic CSI-RS measurement resources and SSB: Time interval requirement between SSB and CSI-RS: In order to ensure the synchronization between CSI-RS measurement and SSB measurement, the time interval between the issuance time of the CSI reporting trigger signal and the nearest SSB measurement resource needs to meet certain requirements. This time interval can be determined by a predefined method. Predefined time interval: The standard or protocol can specify a fixed time interval to ensure that the CSI-RS resource is triggered and CSI reporting is triggered at the appropriate time after SSB measurement. This can avoid measurement deviation due to timing issues.

[0262] 5. CSI reporting process: CSI reporting trigger: After the terminal completes acquisition through timing information, the network side triggers CSI reporting according to the request signal of the terminal. The content reported by the terminal includes the CSI measurement results of L candidate cells and L1-SINR or L1-RSRP information for M beams in each cell. Association with SSB measurement: The CSI reporting of the terminal depends on the QCL relationship between SSB and CSI-RS resources. Through the timing information of SSB measurement, the terminal can ensure the accuracy and time consistency of CSI-RS measurement.

[0263] 6. Advantages of the scheme: Avoiding resource waste: When the terminal cannot obtain timing information, it can inform the network side through the request signal to avoid activating CSI reporting, thereby avoiding the waste of invalid resources. Accurate reporting time control: By managing the time interval between SSB and CSI-RS measurement resources, the terminal can perform CSI measurement and reporting at the appropriate time, ensuring the accuracy of the reporting. Flexible triggering mechanism: The terminal interacts with the network side through a 1-bit request signal, making the activation of CSI reporting more flexible. The network can dynamically trigger reporting according to the state of the terminal, improving resource utilization.

[0264] The sixth mode provides a CSI-RS measurement and reporting mechanism based on timing information. The terminal obtains the timing information of the candidate cell through SSB measurement, and performs CSI-RS measurement through the QCL relationship. If the terminal does not obtain the timing information, it can notify the network side to avoid resource waste through a 1-bit request signal. The triggering time of CSI reporting and the SSB measurement resource need to satisfy a certain time interval to ensure the time domain synchronization of the measurement. Through the flexible triggering and request mechanism, the resource allocation of CSI reporting is optimized, and the overall performance of the network is improved.

[0265] The application and reporting mechanism in the fourth and fifth modes relies on close interaction between the terminal and the network, especially in terms of resource scheduling and reporting triggering, when dealing with semi-persistent or aperiodic CSI reporting. The following are the specific details in these two modes, including how the terminal requests the network to issue CSI-RS measurement resources, and how the network indicates which candidate cells need to issue CSI-RS measurement resources or report CSI through bit or index.

[0266] 1. Semi-persistent and aperiodic CSI reporting triggering mechanism: Semi-persistent CSI reporting: triggered by MAC CE (Medium Access Control Control Element). MAC CE is a control information transmission method between the terminal and the network, suitable for periodic reporting triggering, ensuring efficient use of semi-persistent reporting resources. Aperiodic CSI reporting: triggered by DCI (Downlink Control Information). DCI provides flexibility in downlink signaling, and can dynamically trigger the reporting behavior of the terminal according to network needs, suitable for temporary or aperiodic CSI reporting.

[0267] 2. Request or application mechanism of the terminal: The terminal applies for CSI-RS measurement resources or reports CSI: In the fourth mode, the terminal carries application information through UCI (Uplink Control Information) to request the network side to issue CSI-RS measurement resources or report CSI. This application mechanism can be active, that is, the terminal requests further CSI resource allocation based on synchronization information after completing SSB measurement. Application information carrying: UCI carrying: Application information can be carried through UCI to inform the network side which candidate cells need CSI-RS resources. MAC CE carrying: In the fifth mode, application information can be carried through MAC CE, especially in the semi-persistent scenario. MAC CE is suitable for carrying complex instructions and large-scale resource applications.

[0268] 3. Number of candidate cells and beams for reporting: Configuration of L and M: The terminal reports the measurement results of L candidate cells according to the network configuration, and reports the L1-RSRP or L1-SINR values of M beams for each candidate cell. This configuration ensures that the network can accurately schedule resources and optimize beam measurement.

[0269] Reporting content: L1-RSRP or L1-SINR measurement value: The reported measurement information can be the L1-RSRP (reference signal received power) or L1-SINR (signal-to-noise ratio) of each candidate cell. CSI-RS resource index (CRI): When reporting, the terminal will also provide the corresponding CSI-RS resource index (CRI), ensuring that the network can accurately identify the beam and channel state information.

[0270] 4. Network side indication mechanism: Candidate cell indication method: Bitmap indication: The network can indicate which candidate cells need to be assigned CSI-RS measurement resources or perform CSI reporting through bitmap. Each bit corresponds to a candidate cell, and bit 1 indicates that the cell needs to be assigned CSI-RS resources or perform reporting, and bit 0 does not. where N is the total number of candidate cells. This method has the advantage of being able to indicate multiple candidate cells with less bit overhead, especially suitable for cases with fewer candidate cells.

[0271] 5. Range of candidate cells: including or not including the current serving cell: In these schemes, the candidate cells can include or not include the current serving cell. This depends on the specific needs and configuration of the network. For example, when the beam quality of the current serving cell needs to be evaluated, the serving cell can be included in the candidate cell list. Conversely, if only the CSI measurement of other candidate cells is concerned, the current serving cell can be excluded.

[0272] 6. Specific execution process of the method: Terminal performs SSB measurement: The terminal first performs SSB measurement on the candidate cells to obtain timing information and synchronize with the candidate cells. Terminal applies for CSI-RS resources: Based on the synchronization information, the terminal applies for the assignment of CSI-RS measurement resources or requests the triggering of CSI reporting to the network side through UCI or MAC CE. This application information can indicate which candidate cells need to be assigned CSI-RS resources through bitmap or cell index. Network side assigns resources: After receiving the application of the terminal, the network triggers the assignment of CSI-RS measurement resources according to the application information. The assignment information can be triggered by MAC CE or DCI. CSI reporting triggering and execution: The network activates the CSI reporting of the terminal according to the configuration. The terminal selects L candidate cells according to the network indication, reports the L1-RSRP or L1-SINR measurement results of M beams for each cell, and reports the corresponding CSI-RS resource index (CRI).

[0273] 7. Advantages of the scheme: flexible triggering mechanism: trigger semi-persistent CSI reporting through MAC CE, trigger aperiodic CSI reporting through DCI, ensure flexible scheduling of resources and timeliness of reporting. Optimized application mechanism: terminal requests resources through UCI or MAC CE, so that network can dynamically adjust the delivery of CSI-RS resources and the triggering of CSI reporting, avoiding unnecessary resource waste. Effective indication method: indicate candidate cells through bitmap or index, which can simplify communication overhead and improve network control flexibility.

[0274] In the fourth and fifth ways, the terminal uses UCI or MAC CE to carry the application information when requesting the network to deliver CSI-RS resources or trigger CSI reporting. The network can flexibly indicate the candidate cells that need to deliver CSI-RS resources through bitmap or candidate cell index. The terminal selects L candidate cells and M beams for each cell according to network configuration, and reports L1-RSRP or L1-SINR. This flexible mechanism can effectively avoid resource waste, while ensuring that the network dynamically schedules resources according to real-time needs, improving the efficiency and accuracy of CSI reporting.

[0275] Scheme two: This scheme describes the scenario where the terminal (UE) acquires synchronization information through SSB measurement resources of the serving cell, and measures the CSI-RS resources of the candidate cell according to the QCL (Quasi Co-Location) relationship. The terminal reports based on the SSB or CSI-RS measurement results of the serving cell, and the network side determines the subsequent CSI-RS resource delivery or CSI information reporting based on these reporting information and the QCL relationship between the serving cell and the candidate cell. The specific scheme is as follows:

[0276] 1. Establishment of QCL relationship: QCL relationship between serving cell and candidate cell: there is a QCL relationship between the SSB or CSI-RS measurement resources of the serving cell and the CSI-RS resources of the candidate cell. Through this relationship, the terminal can measure the CSI-RS resources of the candidate cell based on the synchronization information obtained from the SSB or CSI-RS resources of the serving cell. Source reference resource: the SSB or CSI-RS resources of the serving cell, or the CSI-RS resources of the candidate cell, can be used as the source reference resource of the QCL relationship, providing time and frequency synchronization for the terminal to measure the CSI-RS resources of other cells.

[0277] 2. Terminal reporting information: L1-RSRP and SSBRI / CRI information reporting: The terminal measures the L1-RSRP (reference signal received power) information and SSBRI (synchronization signal block reference indication) or CRI (channel reference indication) information based on the SSB or CSI-RS measurement of the serving cell. The reporting content can be the measurement results of all beams of the serving cell, or only part of the beams. For example, the terminal can select M beams that have QCL relationship with the candidate cell, and these beams have good channel quality.

[0278] Selective reporting: The terminal can only report the beam information that has QCL relationship with the candidate cell. These beams usually have good channel quality, which can improve the efficiency of measurement and reporting. The reported information can include L1-RSRP value, SSBRI / CRI information, and index information of the candidate cell.

[0279] 3. Network side decision and resource allocation: Based on the QCL relationship, determine the resource allocation: Based on the L1-RSRP information, SSBRI / CRI information, and index information of the candidate cell reported by the terminal, and combined with the QCL relationship between the SSB or CSI-RS resources of the serving cell and the CSI-RS resources of the candidate cell, the network side determines whether to allocate CSI-RS measurement resources to the candidate cell, or requires the terminal to report the CSI information of the candidate cell.

[0280] 4. Several possible implementation schemes: In actual implementation, any one of the following schemes can be selected according to different needs and scenarios:

[0281] Scheme one: Based on partial beam reporting: Beam selection: The terminal only reports the L1-RSRP information and SSBRI information of M beams that have QCL relationship with the candidate cell in the SSB or CSI-RS measurement of the serving cell. Network side decision: Based on this reported information, the network side determines whether to allocate CSI-RS measurement resources to these candidate cells, or requires the terminal to report the CSI information of the candidate cell.

[0282] Scheme two: Full beam measurement and selective reporting: Full beam measurement: The terminal performs L1-RSRP measurement on all beams of the serving cell, but only reports part of the beam information with good channel quality, especially the beams that have QCL relationship with the candidate cell. QCL relationship decision: The network determines which candidate cells need to be allocated CSI-RS measurement resources, or triggers the terminal to report the CSI of these candidate cells, based on the reported information and QCL relationship.

[0283] Scheme three: reporting based on candidate cell index: candidate cell index reporting: the terminal can directly report the L1-RSRP and SSBRI information related to the candidate cell, combined with the QCL relationship between the serving cell and the candidate cell, the terminal does not need to report all the beam information, but directly indicates which candidate cell needs resource allocation. Network side resource trigger: the network side decides to issue CSI-RS resources to which candidate cell or requires the terminal to report CSI according to the candidate cell index information.

[0284] Scheme four: dynamic adjustment based on serving cell resources: dynamic resource allocation: the terminal selects the beam with better channel quality for reporting based on the serving cell SSB or CSI-RS measurement, and the network side dynamically adjusts the allocation of CSI-RS resources between the serving cell and the candidate cell according to the QCL relationship. Improve reporting efficiency: this way can maximize resource utilization while maintaining high reporting efficiency, reducing unnecessary CSI measurement and reporting overhead.

[0285] 5. Advantages of the scheme: resource utilization optimization: through the QCL relationship, the terminal can accurately measure the CSI-RS resources of the candidate cell without the need for re-synchronization, saving resources. Flexible reporting mechanism: the terminal can flexibly select to report part or all of the beam measurement information according to the network side configuration, optimizing the signaling overhead. Dynamic resource scheduling: the network side can flexibly decide whether to issue CSI-RS measurement resources to the candidate cell or trigger CSI reporting based on the terminal's reporting information, improving the flexibility of resource scheduling. Scheme two provides a reporting mechanism based on the synchronization information obtained from the serving cell SSB or CSI-RS resources and the CSI-RS measurement of the candidate cell using the QCL relationship. The terminal can selectively report the beam information related to the candidate cell with QCL relationship, and the network side can dynamically decide to issue CSI-RS measurement resources or require the terminal to report CSI based on these reporting information. Through this mechanism, resource allocation can be effectively optimized, measurement and reporting overhead can be reduced, and the flexibility and accuracy of reporting can be improved.

[0286] Method one: periodic CSI-RS measurement resources and periodic reporting:

[0287] In this case, the terminal measures according to the configured periodic CSI-RS measurement resources and reports CSI information in a periodic manner. The specific reporting mechanism is the same as that in scheme one, method one. It should be noted that the starting time of periodic CSI-RS resource must satisfy a certain time interval with the latest serving cell SSB or CSI-RS measurement resource to ensure time synchronization. This time interval can be determined by pre-defined method to ensure the accuracy of measurement and reporting.

[0288] Method two: Periodic CSI-RS measurement resources and semi-persistent or aperiodic reporting:

[0289] In this case, the terminal measures through periodic CSI-RS resources, but the reporting mechanism is semi-persistent or aperiodic triggered reporting. Based on the measurement results (such as L1-RSRP, L1-SINR, SSB or CSI-RS index information) of the serving cell reported by the terminal, the network side decides to trigger which candidate cell to report CSI.

[0290] Triggering and reporting process: The terminal feeds back the measurement information of the serving cell: The terminal reports the L1-RSRP or L1-SINR information of the SSB or CSI-RS resource it measures, as well as the index information (SSBRI or CRI). Based on the QCL relationship, the network side triggers at least the candidate cells with QCL relationship with the SSB or CSI-RS reported by the terminal to report CSI. Trigger signal issuance: The serving cell issues a trigger signal to the terminal, triggering semi-persistent or aperiodic CSI reporting. The trigger signal indicates the specific candidate cell and its beam information that needs to be reported. Candidate cell CSI reporting: The terminal reports the L1-RSRP or L1-SINR information of the candidate cell, and the reporting content is based on the network side indication configuration, which can be partial or full beam measurement information.

[0291] Method three: Semi-persistent or aperiodic CSI-RS measurement resources:

[0292] This method is for semi-persistent or aperiodic CSI-RS measurement resources. The terminal waits for the trigger signal from the network side based on the measurement information of the serving cell. The network side decides to trigger which candidate cell's CSI-RS resource to issue or report based on the measurement results fed back by the terminal.

[0293] Triggering and reporting process: The terminal feeds back the measurement information of the serving cell: The terminal reports the measurement information (such as L1-RSRP, L1-SINR, SSBRI or CRI) of the SSB or CSI-RS of the serving cell. Triggering CSI-RS measurement signal issuance to candidate cells: Based on the QCL relationship, the network side decides to issue CSI-RS measurement resources to which candidate cells. The network triggered CSI-RS resources can be semi-persistent or aperiodic, and the specific selection depends on the network load and demand. Reporting trigger: When the network side triggers CSI reporting, the terminal selects L candidate cells according to the configuration, and reports the L1-RSRP or L1-SINR measurement results of M beams for each candidate cell.

[0294] Flexible reporting mechanism: The terminal can determine the number of beams to report based on the network side configuration. If the number of beams configured by the network is less than the number of beams with QCL relationship with the serving cell SSB or CSI-RS, the terminal can select the beam with better channel quality for reporting. At least the measurement results of the beams with QCL relationship with the SSB or CSI-RS resources of the serving cell are reported to ensure the accuracy of the measurement and the effectiveness of the reporting.

[0295] Advantages of the scheme: Utilization of QCL relationship: Whether periodic or aperiodic CSI-RS measurement, the trigger for reporting is based on the QCL relationship between the serving cell and the candidate cell. This association improves the accuracy of resource scheduling and reduces the redundancy of measurement and reporting. Flexibility of reporting: The terminal can dynamically select the candidate cell and beam for reporting according to the network configuration, ensuring the effectiveness of the reporting while avoiding unnecessary resource waste. Optimized resource trigger: Through the semi-persistent or aperiodic triggering mechanism, the network can trigger CSI reporting at the appropriate time, reducing unnecessary signaling overhead and improving network performance.

[0296] Method one and method two provide reporting mechanisms for periodic CSI-RS measurement resources, supporting periodic and aperiodic reporting respectively. Method three targets semi-persistent or aperiodic CSI-RS measurement resources, dynamically triggering CSI reporting in combination with the feedback information of the serving cell. These three methods make full use of the QCL relationship, ensuring efficient scheduling of resources and accuracy of reporting.

[0297] Scheme three: In this scheme, the candidate cell configures CSI-RS measurement resources, and the terminal (UE) measures the CSI-RS resources of the candidate cell based on the synchronization information of the serving cell. Whether it is periodic, semi-persistent or aperiodic L1-RSRP or L1-SINR reporting, the terminal will make flexible selection and reporting according to the network configuration and its own measurement results. The specific candidate cell for reporting and the number of measurement beams for each candidate cell depend on the terminal's autonomous selection.

[0298] 1. CSI-RS measurement and reporting mechanism: Periodic CSI-RS measurement and reporting: The terminal measures periodically based on the periodic CSI-RS measurement resources configured by the network, and reports according to the configured rules, which may be L1-RSRP or L1-SINR information. Semi-persistent or aperiodic CSI-RS measurement and reporting: The network can trigger CSI-RS measurement through semi-persistent or aperiodic means, and the terminal selects L candidate cells and M beams under each cell for L1-RSRP or L1-SINR reporting according to the configured trigger signal.

[0299] 2. Reporting selection mechanism of terminal: Configuration of L and M: The network side can configure the number of reported candidate cells L and the M measurement beam information of each cell. The specific selection of which candidate cells and which measurement beams of each candidate cell to report depends entirely on the autonomous selection of the terminal. Reporting content: Mainly report L1-SINR and / or L1-RSRP information. The terminal can select the measured and reported beams and cells according to the network's indication. Between the cells and beams with QCL relationship, the terminal can preferentially select the resources with better channel quality for reporting.

[0300] 3. Flexible reporting of L1 measurement: L1 measurement based on CSI-RS: In this scheme, the terminal's reporting is mainly based on L1 measurement of CSI-RS resources. The main reporting quantity includes L1-SINR and L1-RSRP information. Flexible beam selection: The terminal flexibly selects the L1 measurement information of M beams for reporting according to the measurement results. This flexibility enables the terminal to preferentially report beams with better channel quality, optimizing resource utilization.

[0301] 4. Extension to CSI measurement and reporting: Although this scheme mainly targets the reporting of L1 measurement (L1-SINR and L1-RSRP), it is also applicable to the triggering and reporting of CSI measurement. In this extended scenario, the terminal can perform the following: Triggering of CSI-RS measurement resources: The network can trigger the terminal to perform CSI-RS measurement. This CSI-RS resource can be consistent with the CSI-RS resource for L1 measurement, or it can be specifically configured for CSI measurement. Extension of reporting content: In addition to reporting L1-SINR and L1-RSRP information, the terminal can also report other CSI-related information, including at least one of CQI (Channel Quality Indicator), RI (Rank Indicator), and PMI (Precoding Matrix Indicator). Reporting of resource index information: The terminal can report CRI (Channel Reference Indicator) information of the CSI measurement resource, identifying the specific resource index for CSI measurement. These information can be reported together with the L1 measurement information, or independently reported, ensuring that the network can accurately identify the resources corresponding to different measurement results.

[0302] 5. Combination of L1 and CSI reporting mechanisms: Combination of L1 and CSI measurements: The terminal can simultaneously perform L1 and CSI measurements and select to report L1-SINR, L1-RSRP information, and CSI information according to network configuration. This enables the terminal to provide more comprehensive channel state information under the same measurement resource. Unified triggering and reporting mechanism: Whether it is L1 measurement or CSI measurement, the terminal can flexibly select the reported candidate cell and beam information based on the network side's configuration or triggering signal. This unified triggering and reporting mechanism can improve network resource utilization and reduce unnecessary signaling overhead.

[0303] 6. Application scenario: Dense network environment: In high-density cell or complex network environment, the terminal can flexibly select the reported beam and candidate cell according to the real-time channel condition, ensuring that the reported content has the maximum value for network side scheduling. Resource-constrained scenario: In the case of limited network resources, the terminal can reduce unnecessary resource waste and optimize the efficiency of reporting by autonomously selecting a beam with good channel quality for reporting.

[0304] 7. Advantages of the scheme: Autonomous reporting: The terminal flexibly selects the candidate cell and beam for reporting according to the actual measurement results, improving the effectiveness of reporting. Support for multiple measurement types: This scheme is not only applicable to L1 measurement, but can also be extended to CSI measurement, providing more comprehensive channel state information. Flexible reporting mechanism: The network controls the number of beams and candidate cells reported by the terminal by configuring the L and M parameters, and the terminal flexibly selects the reporting content based on this, achieving flexibility and efficiency of the reporting mechanism.

[0305] Scheme three provides a flexible CSI-RS measurement and reporting mechanism, allowing the terminal to perform CSI-RS measurement on candidate cells based on the synchronization information of the serving cell, and flexibly selecting the L1 measurement and CSI measurement results for reporting. Through the L and M parameters configured by the network, the terminal can autonomously select which measurement information of which cells and beams to report. This mechanism is not only applicable to L1-SINR and L1-RSRP measurement, but also to more complex CSI measurement and reporting, with strong flexibility and scalability.

[0306] In multiple schemes, the values of L and M can be flexibly configured as any one of {1, 2, 3, 4}, and the specific value is configured by the network side according to the demand. Here, L represents the number of candidate cells, and M represents the number of beams reported under each candidate cell. This configuration is applicable to L1-RSRP and / or L1-SINR reporting based on CSI-RS measurement, and is also applicable to CSI reporting. In order to reduce the reporting overhead of the terminal, the network side can further constrain the number of candidate cells and CSI reported, and the specific scheme is as follows:

[0307] 1. Flexible configuration of L and M:

[0308] Configuration of L (number of candidate cells): The network side can configure the number of candidate cells reported by the terminal, and the value of L can be selected from {1, 2, 3, 4}. The network can flexibly adjust the number of candidate cells according to different scenarios and network conditions: for example, in the case of resource shortage or the need to reduce reporting overhead, L can be configured as 1 or 2, limiting the terminal to report measurement information of only a small number of candidate cells.

[0309] Configuration of M (number of beams per cell): Similarly, the value of M can be selected from {1, 2, 3, 4} to indicate the number of beams reported by each candidate cell: For example, the network side can configure M to be 1 to reduce the number of beams reported by the terminal, or configure M to be 3 or 4 when the channel quality requirement is high to obtain more comprehensive beam information.

[0310] 2. Limitation on the number of CSI reports: Limitation on the number of CSI for candidate cells: In order to further reduce the reporting overhead, the network side can constrain the number of CSI reported by each candidate cell. The configuration is as follows: Single CSI report: The network can limit each candidate cell to report 1 CSI information to reduce the complexity and signaling overhead of reporting. Up to 2 or 4 CSI reports: In some cases, the network may allow each candidate cell to report up to 2 or 4 CSI information to provide more channel state information, but not more than this limit. Limitation on the number of candidate cells: The network side can further constrain the number of candidate cells reported, which can be configured as follows: No more than 2 or 4 candidate cells: In order to reduce the reporting overhead, the network can limit the terminal to report at most 2 or 4 CSI information of candidate cells. This enables the terminal to efficiently utilize network resources while reducing unnecessary reporting. Joint and individual effect: These restrictions can be effective individually or simultaneously. For example, the network can limit the number of reported candidate cells to 2 and each candidate cell to report at most 2 CSI information. It can also constrain the number of candidate cells or CSI individually, depending on the configuration requirements of the network side.

[0311] 3. Limitation on the number of antenna ports of CSI-RS resources: Limitation on the number of antenna ports: In order to simplify measurement and reporting, the network can limit the number of antenna ports of CSI-RS resources used for CSI measurement. The configuration scheme is as follows: Uniform antenna port number: All CSI-RS resources used for CSI measurement can be configured with the same number of antenna ports to ensure standardization and consistency of measurement results. Upper limit of antenna port number: The network can limit the number of antenna ports to not more than a certain value, such as 4, 8, 12, 16 or 32. This limitation helps to reduce the measurement complexity and reporting overhead of the terminal, especially in large-scale antenna systems.

[0312] The QCL relationship in the above scheme can be any one of QCL-TypeA, QCL-TypeB, QCL-TypeC, or QCL-TypeD. In the above scheme, the QCL (Quasi Co-Location) relationship can be any one of QCL-TypeA, QCL-TypeB, QCL-TypeC, or QCL-TypeD. This means that during the switching process or CSI-RS resource configuration, the base station can choose different types of QCL relationships according to specific scenarios and needs to ensure the consistency of channel state information measurement and reporting in space and time. The selection of various QCL relationships is as follows: QCL-TypeA: mainly used to indicate that the antenna ports of the reference signal have the same delay spread, Doppler spread, Doppler shift, and average delay. QCL-TypeB: used to indicate that the antenna ports of the reference signal have the same delay spread, Doppler spread, Doppler shift, and average delay. QCL-TypeC: used to indicate that the antenna ports of the reference signal have the same Doppler shift and average delay. QCL-TypeD: used to indicate that the antenna ports of the reference signal have the same spatial reception parameters. According to different network configurations, the terminal can select the corresponding measurement resources for CSI measurement and reporting based on these QCL relationships to achieve more accurate and efficient communication management.4. Specific scenario configuration examples: Scenario one: configuration in resource shortage: L=2, M=1: the terminal reports 2 candidate cells, and reports L1-RSRP or L1-SINR information of 1 beam for each candidate cell. CSI number limit = 1: a maximum of 1 CSI is reported for each candidate cell. Antenna port number ≤ 8: the antenna port number of the CSI-RS resource used for CSI measurement does not exceed 8.

[0313] Scenario two: detailed channel state reporting: L=3, M=4: the terminal reports 3 candidate cells, and reports L1 measurement information of 4 beams for each candidate cell. CSI number limit = 4: a maximum of 4 CSIs are reported for each candidate cell to provide more comprehensive channel state information. Antenna port number ≤ 16: the antenna port number of the CSI-RS resource does not exceed 16, suitable for scenarios requiring large-scale antenna arrays.

[0314] 5. Advantages of the scheme: high flexibility: the network side can flexibly configure the number of reported candidate cells, the number of CSIs reported for each cell, the number of beams, and the antenna port number of the CSI-RS according to different scenarios and needs. Resource utilization optimization: by restricting the number of reported candidate cells and CSIs, the network can optimize resource utilization without affecting the quality of service, reducing unnecessary reporting overhead. Strong adaptability: this scheme is not only suitable for L1 measurement reporting, but also for CSI measurement, and can cope with different network needs and load conditions.

[0315] In the above multiple schemes, the values of L and M are flexibly configured as {1, 2, 3, 4}, and are applicable to L1 measurement and CSI reporting. The network side can further reduce the reporting overhead by limiting the number of CSI reported by each candidate cell (such as 1, 2, or 4), and limiting the number of candidate cells reported. In addition, the network can also constrain the number of antenna ports of the CSI-RS resource used for CSI measurement, to reduce the measurement complexity of the terminal. These configurations can be used alone or in combination to meet different network requirements and performance targets.

[0316] Second embodiment: beam measurement based on candidate cell semi-persistent or aperiodic CSI-RS measurement.

[0317] Some embodiments of the present application solve the following technical problems.

[0318] Technical problem: workflow and optimization scheme for joint measurement of candidate cell CSI-RS resource configuration and SSB synchronization.

[0319] In the existing 5G NR system, when the terminal supports beam measurement based on CSI-RS (Channel State Information Reference Signal) measurement, the joint measurement and reporting mechanism of the CSI-RS resource configuration of the candidate cell and the SSB (Synchronization Signal Block) needs to be designed in detail to ensure the efficiency of measurement and beam measurement. The following are the key issues and solutions of this mechanism: CSI-RS resource configuration and activation: CSI-RS resource type: Currently, it is clear that the CSI-RS resource of the candidate cell needs to be explicitly configured. The CSI-RS resource can be periodic, semi-persistent, or aperiodic. Activation problem: For semi-persistent and aperiodic CSI-RS resources, the problem of resource activation needs to be considered. The activation of the CSI-RS resource is usually done by the serving cell, while the CSI-RS resource is issued by the candidate cell. Therefore, it is necessary to ensure the time alignment of the candidate cell and the serving cell to avoid synchronization problems in resource configuration and activation. Time alignment: The time alignment between the candidate cell and the serving cell is a key issue, especially in the cross-cell handover scenario, to ensure that the CSI-RS resource can be activated and issued in time and effectively, reducing the delay of beam switching and measurement. SSB and CSI-RS joint measurement and reporting mechanism: SSB synchronization and reporting optimization: If the candidate cell configures SSB for synchronization, basic downlink synchronization can be achieved through SSB. In this case, in order to reduce the overhead of measurement reporting, the network needs to determine when to trigger the measurement and reporting of CSI-RS according to the feedback information of the terminal, for different CSI-RS configuration modes of the candidate cell. Random access problem: Since the traditional NR random access process of the candidate cell has not been completed, the terminal will not send a Preamble signal, so the base station side does not know whether the terminal has completed downlink synchronization. In this case, the network may need to rely on the feedback information of the terminal to determine when to trigger the measurement and reporting of CSI-RS. Terminal feedback and network side triggering mechanism: Terminal reporting quantity: When performing CSI-RS measurement, the terminal may need to report L1 measurement quantities such as L1-RSRP (Reference Signal Received Power), L1-SINR (Signal-to-Noise Ratio), etc. The reported content can also include the terminal's synchronization status to the candidate cell, the measurement result of the current CSI-RS, and whether more CSI-RS resources need to be further activated. Resource issuance and measurement triggering based on terminal feedback: The network side determines whether to trigger the candidate cell to issue more CSI-RS measurement resources or perform L1 measurement quantity reporting based on the information reported by the terminal. This process may need to be optimized in combination with the joint measurement results of the terminal on SSB and CSI-RS, such as triggering further CSI-RS measurement and reporting when determining beam quality improvement. Workflow design: Preliminary synchronization: The candidate cell configures SSB for synchronization, and the terminal completes preliminary downlink synchronization through SSB.CSI-RS configuration and activation: After synchronization is completed, the network side explicitly configures CSI-RS resources for the terminal, and selects periodic, semi-persistent or non-periodic CSI-RS resources for activation according to network load and beam measurement requirements. Terminal feedback and CSI-RS measurement trigger: After the terminal performs SSB synchronization, the terminal performs preliminary measurement of the CSI-RS according to network configuration, and reports the measurement results such as L1-RSRP and / or L1-SINR on UCI. Based on the feedback of the terminal, the network side decides whether to further activate more CSI-RS resources or adjust the beam. Beam switching and resource delivery: When the terminal reports that the quality of the new candidate beam is better than the current beam, the network side can trigger beam switching, and if necessary, deliver more CSI-RS resources through the serving cell. Time-frequency domain constraints and optimization: Time-frequency resource coordination: In order to ensure the effectiveness of beam measurement, the CSI-RS resources of the candidate cell and the SSB resources of the serving cell need to be effectively coordinated in the time-frequency domain to avoid resource conflicts. At the same time, it is necessary to ensure that the CSI-RS measurements between different candidate cells have a relatively consistent time interval to ensure the accuracy of the measurement data. In summary, the candidate cell SSB and CSI-RS joint measurement and reporting mechanism needs to be optimized in terms of resource configuration, terminal feedback, time alignment and other aspects to ensure the efficiency and accuracy of beam measurement. Through reasonable resource allocation and measurement trigger mechanism, the beam switching performance of the network can be greatly improved, and the measurement overhead and delay can be reduced.

[0320] In this embodiment, when the CSI-RS resource is non-periodic or semi-persistent, the transmission of the CSI-RS resource needs to be started by a trigger signal, and the trigger signal is usually sent by the serving cell, and the CSI-RS resource itself is delivered by the candidate cell. In order to coordinate the trigger and resource delivery between the serving cell and the candidate cell, this embodiment proposes several different schemes.

[0321] Scheme one: coordination request process of serving cell and candidate cell: In this scheme, the serving cell and the candidate cell need to be coordinated, the serving cell is responsible for triggering the delivery of the CSI-RS, and the CSI-RS resource itself is sent by the candidate cell. The specific process is shown in FIG. 4C, it is noted that the order of the following signaling is not absolute, and not all signaling is necessary, for example, the candidate cell can reply to the response message of the serving cell.

[0322] Specific process: SSB measurement and synchronization: UE performs beam measurement based on the SSB measurement resource of the candidate cell, ensuring that the UE is time and frequency domain synchronized with the candidate cell. QCL relationship of CSI-RS resource: There is a QCL mapping relationship between the SSB and the CSI-RS measurement resource of the candidate cell, and the QCL relationship can be one-to-one or one-to-many. Trigger request process: After the UE completes the first level feedback, the serving cell sends a transmission request for the aperiodic or semi-persistent CSI-RS resource to the candidate cell, and the candidate cell can send a response message after receiving the request. Subsequently, the serving cell sends a trigger message to the UE to trigger the transmission of the aperiodic or semi-persistent CSI-RS resource.

[0323] Definition of trigger time: The reporting of SSB measurement results is based on scheduling completion, so the time of reporting can be determined. The start time of the CSI-RS resource request sent by the serving cell to the candidate cell can be based on the MAC CE or DCI message of the PUCCH or PUSCH transmission, or based on the symbol or slot where the SSB measurement result is reported. The request message can contain time offset information to indicate the time offset of the CSI-RS resource allocation relative to the trigger message. It can also contain the time information when the serving cell sends the trigger message.

[0324] Scheme two: UE directly reports synchronization completion message:

[0325] In this way, after the UE measures the SSB of the candidate cell and obtains synchronization with the candidate cell, it can directly report a synchronization completion message to the serving cell, informing the serving cell and the candidate cell that the CSI-RS resource can be allocated.

[0326] Specific process: synchronization completion reporting: UE directly reports a synchronization completion message to the serving cell, indicating that the UE has completed synchronization with the candidate cell. Request message sending: After receiving the synchronization completion message, the serving cell sends a request message to the candidate cell, requiring the candidate cell to allocate CSI-RS measurement signals. Other processes are the same as scheme one, and the coordination process between the serving cell and the candidate cell remains the same.

[0327] Scheme three: Serving cell allocates trigger semi-persistent CSI-RS resource: The serving cell is responsible for triggering the transmission of the CSI-RS resource, and the actual CSI-RS resource is allocated by the candidate cell.

[0328] Trigger and allocation process: MAC CE activation: According to the standard, the allocation of semi-persistent CSI-RS / CSI-IM resources is activated by MAC CE. The terminal assumes that the CSI-RS / CSI-IM transmission should start from the first slot of .

[0329] Time adjustment: Since the CSI-RS / CSI-IM resource is issued by the candidate cell, the serving cell needs to inform the candidate cell when issuing the activation signal. The actual CSI-RS / CSI-IM transmission time should be based on , plus the communication delay X between the serving cell and the candidate cell, denoted as Where the value of X can be any one of 0 to 64 multiplied by ; or directly change the value of 3 in , for example, can be Where Y can be any one of 3 to 67.

[0330] Triggering of aperiodic CSI-RS / CSI-IM: For aperiodic CSI-RS / CSI-IM resources, the sending and CSI reporting are triggered by DCI, and the time offset is also calculated based on or .

[0331] Extension of MAC CE signaling: The MAC CE in the current standard only supports triggering the serving cell to issue semi-persistent CSI-RS / CSI-IM resources. In order to support the triggering of the candidate cell under the LTM, a new MAC CE signaling needs to be defined.

[0332] Extension of MAC CE signaling format: In the existing MAC CE message format, a field is reserved to indicate whether the MAC CE is used to activate or deactivate the semi-persistent CSI-RS resource and / or CSI-IM resource of the candidate cell under the LTM scenario.

[0333] The specific format of the MAC CE is as follows:

[0334] Serving Cell ID: used to indicate the ID of the current serving cell. BWP ID: used to indicate the ID of the bandwidth part. R (reserved bit): used to indicate whether this MAC CE is used for activation / deactivation under the LTM scenario. When the LTM scenario is not configured, R represents the reserved bit.

[0335] Beam measurement and management: The activation and issuance time of the CSI-RS resource and the CSI-IM resource in the above scheme can be applied to beam measurement and management, or to interference measurement.

[0336] Through the different coordination mechanisms of schemes one, two, and three, this embodiment proposes a flexible and efficient CSI-RS resource triggering and delivery scheme. In the process of non-periodic or semi-persistent CSI-RS resource delivery, the coordination between the serving cell and the candidate cell ensures the timeliness of the triggering signal and the effective allocation of resources, while the signaling of the MAC CE is expanded to support the resource delivery of the candidate cell in the LTM scenario.

[0337] In this embodiment, the L field in the MAC CE message is used to indicate whether the message is applicable to activating or deactivating the semi-persistent CSI-RS resource of the candidate cell in the LTM (L1 / L2 triggered mobility) scenario. If the high-level parameter is not configured for the semi-persistent CSI-RS resource in the LTM scenario, the L field will be replaced by the R field (reserved bit), which is usually set to 0 to ensure the compatibility and scalability of the message format.

[0338] The L field in the MAC CE message: The role of the L field: when the L field is set to 1, it indicates that the MAC CE message is used to activate or deactivate the semi-persistent CSI-RS resource of the candidate cell in the LTM scenario. If the CSI-RS resource under LTM is configured, the L field will be activated according to the network's indication. The role of the R field: if there is no relevant semi-persistent CSI-RS resource configured for the LTM scenario, the L field will be replaced by the reserved bit R, indicating that the field is not used. The R field is usually set to 0 to ensure compatibility with MAC CE messages that do not support the LTM scenario.

[0339] MAC CE message applicable to the activation of multiple resources: The MAC CE message format described above is not only applicable to the activation of the semi-persistent CSI-RS resource of the candidate cell, but can also be widely applicable to the management of other resources. The following are the main application scenarios:

[0340] a. Beam measurement and management CSI-RS resource: Beam measurement: activating or deactivating the CSI-RS resource of the candidate cell under LTM can be used for beam measurement and management. Through the scheduling and triggering of CSI-RS resources, the terminal can perform beam selection and switching to ensure the beam quality in mobility management. Precision of beam measurement: through the triggering of semi-persistent or non-periodic CSI-RS resources, the terminal can continuously update the measurement results of the beam to provide more accurate channel state information for the network.

[0341] b. CSI-IM resources for interference measurement: Configuration of interference measurement: In addition to beam measurement, the MAC CE message can also be used for the configuration of CSI-IM resources for interference measurement. Activating resources for interference measurement helps the network better understand the interference across cells, thereby optimizing resource scheduling. Application of aperiodic and semi-persistent CSI-IM resources: Interference measurement resources can be aperiodic or semi-persistent, and the network triggers interference measurement as needed to ensure adaptive interference management by the network under different load conditions.

[0342] c. CSI-RS resources for CSI measurement: CSI measurement: The MAC CE message is also applicable to the activation of resources for CSI (Channel State Information) measurement. CSI measurement is important for network scheduling and resource allocation, especially in LTM scenarios, where the terminal needs to report the channel state in a timely manner to ensure dynamic adjustment of the network to the channel quality.

[0343] CSI management in LTM scenarios: In LTM scenarios, the mobility management of the terminal requires the activation or deactivation of semi-persistent CSI measurement of candidate cells. By simply reusing the existing MAC CE signaling format, semi-persistent CSI measurement of candidate cells can be achieved, ensuring on-demand CSI measurement and reducing the cost of measurement resources.

[0344] Flexibility of MAC CE message format: To adapt to various scenarios, the format of the MAC CE message is highly flexible and can be adjusted according to different network requirements. The following are the main configuration options:

[0345] Serving Cell ID: Identifies the current serving cell, used to determine the scope of the MAC CE message.

[0346] BWP ID: Identifies the ID of the bandwidth part (BWP), ensuring that resource activation and management are performed within the specified bandwidth range.

[0347] L or R field: The L field is used to indicate whether to activate the CSI-RS resources of the candidate cell under LTM. If not configured, the R field is reserved.

[0348] IM / CSI-RS resource set ID: Used to identify specific IM or CSI-RS resource sets, the activation or deactivation of these resource sets is controlled by the MAC CE message.

[0349] Timing of resource activation and management: Activation effective time: The resource activation indication in the MAC CE message needs to specify the effective time of the resource configuration. For example, the activation effective time of semi-persistent CSI-RS or CSI-IM resources is usually determined by the time offset information in the message. This time can be used for different applications such as CSI measurement, beam measurement or interference measurement. Activation or deactivation of semi-persistent and aperiodic resources: Whether it is semi-persistent or aperiodic resource, the activation and management of MAC CE message ensures the effective scheduling of resources. For example, semi-persistent or aperiodic CSI-RS resources for beam measurement, interference measurement or CSI measurement can be activated or deactivated by MAC CE message, so that the transmission of measurement resources can be realized according to the network demand. The A / D field indicates whether to activate or deactivate the specified SP CSI-RS and CSI-IM resource set.

[0350] Through the introduction of the L field, the MAC CE message in this embodiment can flexibly activate or deactivate the semi-persistent CSI-RS resources or CSI-IM resources of the candidate cell in the LTM scenario. These resources are not only suitable for beam measurement and management, but also can be applied to the scenarios of interference measurement and CSI measurement. The MAC CE message format provides high flexibility and scalability, which can adapt to different network scenario requirements and ensure efficient management and scheduling of resources. In specific applications, the coordination between the serving cell and the candidate cell is realized through this message format, effectively supporting the mobility management in the LTM scenario.

[0351] Third embodiment: CSI feedback before or during handover command.

[0352] Some embodiments of the present application solve the following technical problems.

[0353] Technical problem: Core challenge of CSI measurement and reporting problem under LTM and possible solutions.

[0354] Under the LTM (L1 / L2 triggered mobility) mechanism, there are some challenges in CSI (channel state information) measurement and reporting, especially in the NR (new radio) standard. How to ensure the communication quality after handover is a key issue when the user equipment (UE) switches from one cell to another. To address the CSI measurement and reporting issues under LTM, the following are some core problems and possible solutions: CSI reporting before cell handover: In the existing NR standard, the CSI reporting mechanism before handover is not perfect, especially in the LTM scenario. The UE has not completed channel measurement on the target cell before handover, so it cannot provide precoding information. To ensure efficient communication after handover, the following solutions can be considered: Early CSI measurement and reporting: Before the UE performs cell handover, the base station can configure the UE with CSI measurement resources for the target cell. The UE can measure the channel of the target cell in advance during the process of switching between the source cell and the target cell, and report the measured CSI information to the source cell or the target cell before handover. This early CSI measurement and reporting can help the base station use efficient precoding and MCS levels immediately after handover. Candidate cell CSI reporting mechanism design: For CSI reporting before handover, it is a problem that needs further design to report which candidate cell's CSI information and how to report. The existing standard does not support this in detail. In the future, the base station can configure a set of candidate cell CSI measurement sets for the UE in RRC (radio resource control) signaling. The UE can perform parallel CSI measurement and reporting for these candidate cells. Based on these measurement results, the network can better select the target cell for the UE and obtain the corresponding CSI information in advance before handover. Fast CSI feedback after cell handover: After the UE switches to the new target cell, the base station can only communicate with the UE at a low code rate or MCS level because it has not completed channel measurement on the new cell. In this case, fast CSI feedback is crucial to improve communication efficiency. The following design can be considered: Fast CSI measurement and reporting flow design: When the UE receives the command to switch to the target cell, the base station can immediately trigger CSI measurement and / or reporting. To reduce the delay of CSI feedback, the UE can automatically perform fast CSI measurement when accessing the target cell and report the preliminary measurement results as soon as possible. This can be achieved through the L1 / L2 layer fast feedback mechanism, avoiding relying on L3 layer signaling, thereby shortening the measurement and feedback time. Triggering and measurement flow optimization of CSI reporting: The existing NR standard usually uses periodic or event-triggered methods for CSI reporting, but in the LTM scenario, the traditional reporting trigger method may cause a large delay.Therefore, for the fast switching requirement of LTM scenario, the measurement and reporting trigger mechanism of CSI needs to be redesigned: early configuration of CSI measurement resource: before switching, the base station can configure the CSI measurement resource of the target cell for the UE in advance, so that the UE can immediately start CSI measurement without waiting for additional RRC configuration after switching. This way can effectively shorten the CSI feedback delay after switching. CSI reporting based on switching event: when switching occurs, the base station can directly trigger CSI reporting through the switching command without waiting for the trigger of the target cell signaling. This can be achieved by attaching CSI measurement and / or reporting activation indication in the switching command, and the UE automatically performs CSI reporting after switching to the target cell. Future standard design considerations: for the CSI measurement and reporting problem under LTM, the future standard needs to be further designed and optimized: early CSI reporting mechanism standardization: in the existing standard, the CSI reporting mechanism of the UE before switching is not fully standardized. In the future, the CSI measurement resource of the candidate cell can be configured for the UE through RRC signaling, and it is specified which cell's CSI information is reported, so as to provide a basis for the base station to obtain precoding information before switching. Optimization of fast CSI feedback mechanism: the fast CSI feedback mechanism after switching also needs to be optimized at the protocol level, especially in terms of L1 / L2 layer triggering and feedback process. The future standard can specify the CSI measurement trigger conditions under different scenarios, as well as the corresponding reporting frequency and dynamic allocation method of measurement resource. In summary, the CSI measurement and reporting under LTM involve early CSI reporting before switching, fast CSI feedback after switching, and the optimization design of the entire measurement and reporting process. The solutions to these problems need to be further optimized and designed based on the existing NR standard, combined with the actual network requirements.

[0355] In the existing NR standard, the terminal (UE) needs to perform channel measurement after switching to a new cell to obtain precoding information for communication. However, before the precoding information is obtained, the base station can only communicate with the terminal at a low code rate or MCS level. In order to still communicate at a high rate after switching to a new cell, this embodiment proposes two possible solutions: CSI feedback before switching command or fast CSI feedback after switching. The following is a detailed discussion of Case 1: candidate cell CSI feedback before switching command.

[0356] Case 1: candidate cell CSI feedback before switching command: before the switching command is issued, the terminal needs to perform CSI measurement and feedback for the candidate cell to ensure that the channel information of the new cell can be obtained in advance to improve the communication efficiency after switching.

[0357] Terminal synchronization with candidate cell: In order to ensure the accuracy of CSI measurement, the terminal needs to keep synchronization with the candidate cell. This can be achieved by measuring the SSB information of the candidate cell to obtain synchronization information. The terminal can measure and report beam information based on the beam measurement scheme of SSB in Rel-18. If the candidate cell uses aperiodic or semi-persistent CSI-RS resource, information interaction between the candidate cell and the serving cell is needed to ensure that the terminal can accurately receive and measure the CSI-RS resource.

[0358] QCL relationship and CSI-RS configuration: The SSB and CSI-RS resource used by the candidate cell for L1-RSRP and / or L1-SINR measurement should satisfy the QCL relationship with the CSI-RS resource used for CSI measurement, or not. The CSI-RS resource of the candidate cell can be configured by configuring one CSI-RS resource set for each cell, and the resource set is bound to the cell ID.

[0359] CSI feedback scheme: The CSI feedback of the candidate cell does not need to include the CSI measurement results of all candidate cells. In order to reduce the feedback overhead of the terminal, the specific CSI feedback can be based on at least one of the following schemes:

[0360] Scheme one: candidate cell CSI reporting based on beam measurement: beam measurement: can be based on SSB or CSI-RS, the feedback quantity of beam measurement can be L1-RSRP or L1-SINR. Feedback process: for the CSI of the candidate cell considering that the terminal only reports the beam management or L1 measurement of the beam measurement result, beam management can be based on SSB or based on CSI-RS, and the feedback quantity of beam management can be based on L1-RSRP or based on L1-SINR. The terminal reports the L1 measurement result of M beams in L cells. The network side can trigger CSI measurement and reporting based on this information, and only for the CSI-RS resource of the candidate cell with QCL relationship with the reported beam. The terminal further selects which CSI to report. For example, when the CSI measurement of multiple candidate cells is triggered, the terminal can select the CSI of certain CSI-RS resource for reporting. Flexible selection: the terminal can select L cells, M CSI in each cell for reporting according to the actual measurement result and network indication. The network side can determine which cell to switch to through the feedback of the terminal, and indicate the selected CSI-RS resource in the switching command.

[0361] The terminal can determine how many cells and / or how many beams or reference resources to report CSI by the network side, can determine based on a standard predefinition, or can determine by the terminal itself. For example, the standard can indicate the terminal to report c cells, and each cell has d beams / CSI-RS resources corresponding to the CSI information. The terminal can determine which c cells and d resources to report. The values of d and c can be any one of {1, 2, 3, 4}. The values of d and c depend on the terminal's ability to report, and the value of d multiplied by c also depends on the terminal's ability. In addition, if the CSI-RS measurement and reporting are periodic, the terminal can directly select the CSI to be reported based on the above mechanism. The CSI reported by the above periodic CSI-RS measurement resource can be periodic, semi-persistent, or aperiodic.

[0362] In the above scheme, the terminal can determine how many cells and / or how many beams or reference resources to report CSI information by the following methods:

[0363] Network side configuration: The network side can configure the terminal to report c cells and the CSI information corresponding to d beams or CSI-RS resources in each cell by RRC, MAC CE, or DCI instruction. For example, the network can directly indicate the terminal to report c cells and d beams or resources in each cell.

[0364] Standard predefinition: The terminal can select according to the rules pre-defined in the standard. The standard can specify that the terminal reports c cells and d resources in each cell according to the pre-defined rules.

[0365] Terminal self-selection: If there is no explicit network configuration or standard predefinition, the terminal can determine c cells and d beams / resources to report according to its own ability, current network situation, and beam measurement situation. The terminal's selection can depend on its supported reporting capability, such as the number of cells and resources to report, which depends on the terminal's own ability.

[0366] In this process, the values of c and d can be any one of {1, 2, 3, 4}, and the specific selection depends on the terminal capability report, while the product of c and d is also limited by the terminal capability. In addition, when the CSI-RS measurement and reporting are both periodic, the terminal can directly select the required CSI for reporting based on the above mechanism. The CSI reporting mode obtained by the periodic CSI-RS measurement resource can be periodic, semi-persistent, or aperiodic, depending on the network configuration and the terminal measurement. In this way, the terminal can flexibly handle resource selection when reporting, and effectively utilize its measurement capability to optimize the reporting process.

[0367] Scheme two: candidate cell CSI reporting based on network side indication

[0368] Network side indicates the number of CSI: The network side can indicate the terminal to report a certain number of CSI in multiple candidate cells and beams. For example, the network side indicates the terminal to report m CSI in n CSI-RS resources, and the terminal can report n indicated CSI, while selecting m-n CSI for reporting. Multi-cell CSI reporting: When the network side triggers the CSI reporting of multiple cells, the terminal can select the reported candidate cells and beams according to the indication. If the network side indicates the number of reported cells b and the number of CSI m under each cell, the terminal selects the appropriate CSI for reporting according to the indication. If the specific reporting quantity is not indicated, the terminal selects the CSI for reporting according to the actual measurement.

[0369] The terminal reports L1 measurement results of L cells and M beams. Parameter values of L, M, a, b, m, n: The parameter values in the above scheme are flexible and can be predefined according to network configuration or standard. Values of L and M: The values of L (candidate cell number) and M (beam number reported per cell) can be {1, 2, 3, 4, 5, 6, 7, 8}. Values of a, b, m, n: These parameters can be used to indicate the number of cells and CSI that the network requires the terminal to report, and the values can be any one of {1, 2, 3, 4}.

[0370] Standard predefinition and network side configuration: L max and M max configuration: In order to limit the reporting overhead of the terminal, the standard or network can define L max (maximum number of reported cells) and M max (maximum number of beams reported per cell). These parameters can be configured through RRC / MAC CE / DCI.

[0371] Multiple reporting instances: When reporting the CSI of multiple cells, in order to avoid conflicts or resource shortages, the terminal can report through multiple reporting instances. For example, each reporting instance contains at most 4 CSI.

[0372] Extension of semi-persistent and aperiodic CSI-RS measurement: The above scheme can be applied not only to periodic CSI-RS measurement and reporting, but also to semi-persistent and aperiodic CSI-RS measurement. By adapting different trigger signals, the terminal can trigger the corresponding CSI measurement and reporting as needed.

[0373] Measurement and reporting complexity constraints of the terminal: In order to reduce the complexity and measurement resource overhead of the terminal, the standard can make the following constraints: the number of simultaneously measured cells, the number of supported beams per cell, the number of antenna ports of CSI-RS resources, and the sub-band granularity of CSI measurement (e.g., the maximum number of measured cells is 4, and each cell supports at most 2 / 4 / 8 beams).

[0374] In this embodiment, the CSI feedback for candidate cells can be performed before the handover command to ensure that the terminal can immediately communicate at a high code rate after handover. Scheme 1 and Scheme 2 propose different reporting strategies, allowing the terminal to flexibly select CSI reporting based on beam measurement results and further optimize the reporting content through network indication. By configuring parameters such as L, M, a, b, m, n, etc., the reporting overhead can be effectively controlled, and communication efficiency can be ensured. When semi-persistent and aperiodic CSI measurement is applicable, these reporting mechanisms can also be used.

[0375] Furthermore, for the above scheme, multiple CSI information corresponding to multiple beams under multiple cells can be reported, and the CSI information reported by the terminal can include at least one of the following: cell ID, CRI information, PMI, RI, and CQI information. The above reporting information can be divided into Part 1 and Part 2, and for Type-I codebook, Part 1 can include at least one of the following: cell ID, CRI information, RI information, and CQI information of the first code. For Rel-16eType-II codebook, Part 1 can include at least one of the following: cell ID, CRI information, RI information, CQI information, and the number of non-zero wideband amplitude coefficients per layer. Each information in Part 1 is independently encoded, and if multiple cell IDs and / or multiple CRI information are included, the mapping rule in Part 1 can adopt at least one of the following forms:

[0376] Manner one: block by cell, that is, the information corresponding to each cell is continuously mapped, which can be sorted by cell index, for example, the part 1 information of the first cell with the smallest index is mapped first, the part 1 information of the second cell with the next index is mapped, and then the mapping is sequentially performed until the last cell with the largest index. The information in each cell can be arranged in the order of Cell ID first, CRI information last, and RI and CQI in any order. Note that the above information is not all required to be reported, and some information may not need to be reported, for example, if the Cell ID is not reported, the mapping order of the information in part 1 is CRI information first, and RI and CQI information can be arranged in any order.

[0377] Manner two: block by content, that is, the same content is blocked by cell, that is, the Cell ID information in the part 1 of multiple CSIs is placed together and arranged in the order of the index of the cell, then the CRI information in the part 1 of multiple CSIs is placed together and arranged in the order of the index of the cell, and then RI and CQI are processed in the same manner, and RI and CQI can be arranged in any order. Note that the above information is not all required to be reported, and some information may not need to be reported, for example, if the Cell ID is not reported, the mapping order of the information in part 1 is CRI information first, and RI and CQI information can be arranged in any order.

[0378] In the above two manners, the index of the cell is sorted. If the CSI reporting is based on L1 measurement results, the index of the CRI in the L1-RSRP or L1-SINR reporting can be arranged in the order of the index. In the above two manners, the index of the CRI can be the index of the CRI in a single cell, the index of the CRI in all candidate cells, or the index of the CRI in the cell to be reported. In the above scheme, the CSI reporting can include or not include the serving cell, which can depend on the configuration of the network side or the standard predefinition.

[0379] The QCL relationship in the above scheme can be any one of QCL-TypeA, QCL-TypeB, QCL-TypeC, or QCL-TypeD. In the above scheme, the QCL (Quasi Co-Location) relationship can be any one of QCL-TypeA, QCL-TypeB, QCL-TypeC, or QCL-TypeD. This means that during the handover process or CSI-RS resource configuration, the base station can choose different types of QCL relationships according to specific scenarios and needs to ensure the consistency of channel state information measurement and reporting in space and time. The selection of various QCL relationships is as follows: QCL-TypeA: mainly used to indicate that the antenna ports of the reference signal have the same delay spread, Doppler spread, Doppler shift, and average delay. QCL-TypeB: used to indicate that the antenna ports of the reference signal have the same delay spread, Doppler spread, Doppler shift, and average delay. QCL-TypeC: used to indicate that the antenna ports of the reference signal have the same Doppler shift and average delay. QCL-TypeD: used to indicate that the antenna ports of the reference signal have the same spatial reception parameters. According to different network configurations, the terminal can select the corresponding measurement resources for CSI measurement and reporting based on these QCL relationships to achieve more accurate and efficient communication management. In case 2, it is considered that the terminal quickly measures and feeds back CSI after receiving the handover command to ensure that efficient communication can be restored as soon as possible after switching to the target cell. After switching, since the terminal lacks CSI information of the target cell, the base station can only communicate with the terminal at a lower rate. Therefore, the terminal needs to quickly obtain the CSI information of the target cell, and the following are two possible schemes to achieve this fast CSI measurement and feedback.

[0380] Scheme one (SP CSI-RS):

[0381] In this scheme, the trigger message for CSI measurement is issued at the same time as the handover command, and the message is carried in MAC CE or DCI. The CSI-RS measurement resource can be semi-persistent.

[0382] Process: Trigger message and handover command are issued at the same time: when the base station sends the handover command to the terminal, it includes the trigger message for CSI measurement and may also include beam indication information. These information are carried through MAC CE or DCI to ensure that the terminal can start CSI measurement immediately after switching.

[0383] Measurement of CSI-RS resource: After switching, the terminal receives the CSI-RS measurement resource of the target base station, which can be semi-persistent. Based on the received CSI measurement trigger message, the terminal quickly measures the CSI-RS resource of the target cell to obtain the channel state information (CSI) of the target cell.

[0384] CSI reporting: The base station sends a CSI reporting trigger message to the terminal, which can be multiplexed with the existing LTM CSI reporting trigger message in the standard, carried in MAC CE or DCI. The terminal reports the measured CSI information based on the trigger message, and the CSI reporting can be semi-persistent or aperiodic.

[0385] Activation information: The CSI measurement trigger message may contain the following content: resource set or resource index information corresponding to semi-persistent CSI-RS measurement resources. The state information indicates whether to activate the CSI-RS measurement resources of the target cell in the handover command. The ID information of the target cell, BWP information (bandwidth part information), and the activation or deactivation information of the semi-persistent CSI-RS resource transmission.

[0386] Advantages of the scheme: Fast acquisition of CSI: After switching to the target cell, the terminal can quickly perform CSI measurement and reporting, reducing communication interruption time and ensuring that the base station can quickly resume high-speed data transmission. Flexible triggering: The trigger message carried by MAC CE or DCI can flexibly trigger CSI-RS measurement and CSI reporting.

[0387] Scheme two (SP CSI): This scheme focuses on the synchronous delivery of CSI reporting trigger messages and handover commands, and CSI reporting can be semi-persistent or aperiodic.

[0388] Flow: Trigger message and handover command are delivered synchronously: Similar to scheme one, the handover command contains the CSI reporting trigger message, which is carried in MAC CE or DCI, and may also include beam indication information. CSI reporting trigger: The CSI reporting trigger message contains index information of the CSI reporting configuration, such as CSI-ReportConfigId, which is used to indicate the reported CSI configuration. The trigger message may contain one or more activation or deactivation state indication information (such as S0 and S1), indicating whether to activate the corresponding CSI reporting configuration. Through these state information, the base station can activate or deactivate certain CSI reporting configurations.

[0389] Code point (codepoint) indication of activation: The network side can also use code point to indicate the activation of a certain CSI reporting configuration in the aperiodic trigger state list. The code point indicates the specific CSI reporting configuration and its associated CSI-RS resource or resource set. The message may also contain time domain resource allocation information, indicating the PUSCH time domain resources used for CSI reporting.

[0390] For semi-persistent CSI reporting, if the reporting resource is PUCCH, the existing LTM switching command can also contain at least one of the following configurations on the basis of containing information: ID of the serving cell, BWP of the target cell, BWP of the serving cell, and field S indicating the activation / deactivation state of the semi-persistent CSI reporting configuration under ltmt-CSI-ReportConfigToAddModList i For example, S0 and S1 respectively indicate whether to activate the CSI reporting configuration with CSI reporting configuration index 0 and 1 in the CSI reporting configuration list. If S0 or S1 is 0 / 1, it indicates that the CSI reporting configuration with CSI reporting configuration index 0 or 1 is activated, otherwise the corresponding CSI reporting is deactivated.

[0391] For semi-persistent CSI reporting, if the reporting resource is PUSCH, the existing LTM switching command can also contain at least one of the following configurations on the basis of containing information: ID of the serving cell, BWP of the target cell, BWP of the serving cell, codepoint indication information, time domain resource allocation information, etc.; wherein the codepoint information is used to associate the TriggerState information under the corresponding LTM, and the TriggerState defines the associated LTM-CSI-ReportConfigID under the LTM. Then, through the corresponding LTM-CSI-ReportConfig of the LTM-CSI-ReportConfigID, the corresponding LTM-CSI-RS resource ConfigID can be associated, and the period and OffsetList related to the report can be found. The time domain resource allocation information is used to indicate which offset value in the CSI reporting OffsetList is used.

[0392] For aperiodic CSI reporting, the existing LTM switching command can also include at least one of the following configurations: ID of the serving cell, BWP of the target cell, BWP of the serving cell, codepoint indication information, time domain resource allocation information, etc. on the basis of including information; wherein the codepoint information is used to associate the aperiodic TriggerState information under the corresponding LTM, and the TriggerState will define the associated LTM-CSI-ReportConfigInfo / LTM-CSI-ReportConfigInfoList under the LTM, LTM-CSI-ReportConfigInfo can correspond to LTM-CSI-ReportConfigID information, and then through LTM-CSI-ReportConfig corresponding to LTM-CSI-ReportConfigID can be associated with the corresponding LTM-CSI-RS resource ConfigID, and the period and OffsetList related to the report can be found. The time domain resource allocation information is used to indicate which offset value in the CSI reporting OffsetList is used. The current standard does not support including LTM-CSI-ReportConfigInfoList in CSI-AperiodicTriggerState, so this field can be added, and at least one of the following information can be further configured in this field: LTM-CSI-ReportConfigID corresponding to the reporting configuration ID, LTM-NZP-CSI-RS resourceSet information corresponding to the resource set information, and NZP-CSI-RS QCL information, LTM-CSI-IM-ResourceForInterference information corresponding to the LTM CSI-IM for interference measurement, LTM-NZP-CSI-RS-ResourceForInterference information corresponding to the LTM NZP-CSI-RS information for interference measurement.

[0393] The QCL relationship in the above scheme can be any one of QCL-TypeA, QCL-TypeB, QCL-TypeC, or QCL-TypeD. In the above scheme, the QCL (Quasi Co-Location) relationship can be any one of QCL-TypeA, QCL-TypeB, QCL-TypeC, or QCL-TypeD. This means that during the switching process or CSI-RS resource configuration, the base station can choose different types of QCL relationships according to specific scenarios and needs to ensure the consistency of channel state information measurement and reporting in space and time. The selection of various QCL relationships is as follows: QCL-TypeA: mainly used to indicate that the antenna ports of the reference signal have the same delay spread, Doppler spread, Doppler shift, and average delay. QCL-TypeB: used to indicate that the antenna ports of the reference signal have the same delay spread, Doppler spread, Doppler shift, and average delay. QCL-TypeC: used to indicate that the antenna ports of the reference signal have the same Doppler shift and average delay. QCL-TypeD: used to indicate that the antenna ports of the reference signal have the same spatial reception parameters. According to different network configurations, the terminal can select the corresponding measurement resources for CSI measurement and reporting based on these QCL relationships to achieve more accurate and efficient communication management.

[0394] Advantages of the scheme: flexible CSI reporting configuration: through CSI-ReportConfigId indexing or codepoint indication, the base station can flexibly control the activation or deactivation of CSI reporting configuration. Fast response to network demand: after receiving the switching command, the terminal can quickly perform CSI reporting according to the trigger message to ensure that the base station obtains timely channel state feedback.

[0395] Comparison of the two schemes:

[0396] Scheme one (SP CSI-RS): the switching command contains a CSI measurement trigger, and measurement is based on CSI-RS resources. Fast CSI measurement is performed through semi-persistent CSI-RS measurement resources. Semi-persistent or aperiodic CSI reporting. Supports fast activation of semi-persistent CSI-RS resources. Quickly obtain and report CSI information after switching.

[0397] Scheme two (SP CSI): the switching command contains a CSI reporting trigger, and is based on the configured CSI reporting mechanism. Fast CSI reporting is performed through activated CSI reporting configuration. Semi-persistent or aperiodic CSI reporting. Flexibly activate CSI reporting configuration through codepoint and state indication. Through the flexible activation mechanism of configuration, quickly adapt to network demand.

[0398] Application scenarios: high-speed moving scenarios: these two schemes are particularly suitable for fast cell switching in high-speed moving scenarios, ensuring that the terminal quickly recovers to an efficient communication state after switching. High-load networks: in high-load networks, scheme two can reduce resource waste and improve network response capability through flexible reporting mechanisms. Emergency communication: these schemes can ensure that the terminal quickly recovers communication in emergency situations, thereby ensuring the reliability and stability of the communication link.

[0399] Conclusion: in the fast CSI measurement and feedback after the handover command, scheme one enables the terminal to start CSI measurement immediately after switching and perform fast reporting through the CSI-RS measurement trigger message included in the handover command. Scheme two enables CSI reporting to quickly respond to the scheduling needs of the network after switching through flexible activation of CSI reporting configuration. Both of these two schemes provide an effective means for the terminal to quickly obtain CSI information and recover high-speed communication after cell switching, and can improve communication efficiency in different application scenarios.

[0400] Scheme three (AP CSI measurement and reporting):

[0401] In this scheme, the trigger message for aperiodic CSI measurement and reporting is issued at the same time as the handover command, and may also include corresponding beam indication information, which is carried in MAC CE or DCI. The measurement and reporting of CSI use aperiodic methods, and the trigger message may include index information of the CSI reporting configuration and its associated CSI-RS resource or resource set information. The specific indication form can activate the CSI reporting configuration and its associated CSI-RS resource or resource set in the aperiodic trigger state list through codepoint. At the same time, the message may include information indicating time domain resource allocation, identifying the PUSCH time domain resource corresponding to the CSI reporting.

[0402] For aperiodic CSI measurement and reporting, the existing LTM handover command may also include information on the basis of the information contained in scheme two, and the content of the aperiodic CSI reporting contained in scheme two is the same.

[0403] For aperiodic CSI measurement and reporting, the following information can be included in the existing LTM handover command, in addition to the information contained in the LTM handover command, which is the same as the aperiodic CSI reporting content mentioned in scheme two: CSI measurement trigger message: the LTM handover command can carry a message triggering aperiodic CSI measurement. These messages can contain CSI-RS resource configuration information of the target cell, so that the terminal can perform fast CSI measurement. Beam indication information: the handover command can also contain beam selection or indication information to help the terminal select the appropriate beam for CSI measurement and reporting. CSI reporting trigger message: trigger message related to aperiodic CSI reporting, which can carry information such as CSI reporting timing, resource set or index, etc., to indicate when the terminal reports the measured CSI information. Resource set or index: the handover command can contain the relevant set or resource index information of the aperiodic CSI-RS resource to ensure that the terminal uses the correct resource set for measurement when measuring. BWP information: the handover command can contain bandwidth part (BWP) information to ensure that the terminal can perform CSI measurement on the appropriate bandwidth. By adding these information to the LTM handover command, the terminal can quickly and effectively perform CSI measurement and reporting in the target cell after handover, improving communication quality and reliability of the handover process.

[0404] Handover command decision basis: The handover command can be based on SSB measurement results or CSI-RS measurement results. The measurement results can be L1-RSRP or L1-SINR.

[0405] Service cell inclusion option: Among the L candidate cells or b reported cells, the service cell can be included or not included, depending on the network side configuration or standard predefined manner.

[0406] CSI information content: The reported CSI information includes at least one of CID (cell ID number), CRI (reference channel identifier), PMI (precoding matrix indicator), RI (rank indicator), and CQI (channel quality indicator). The reporting format can be bitmap or index.

[0407] Flexible selection of codebook type: The reported CSI information can be based on Rel-15 Type-I single-panel or multi-panel codebook, or Rel-15, Rel-16, Rel-17 Type-II codebook. Different codebook types can be used between different cells, or different codebook parameters can be used under the same codebook type. When multiple CSIs are reported on the same cell, multiple CSIs can be based on the same or different codebook types, or different codebook parameters under the same codebook type.

[0408] Beam correlation and Rank feedback: In the case of reporting multiple CSIs in the same cell, since there may be correlation between the beams corresponding to multiple CSIs, these CSIs may feedback the same Rank value, further simplifying the feedback process.

[0409] The QCL relationship in the above scheme can be any one of QCL-TypeA, QCL-TypeB, QCL-TypeC, or QCL-TypeD. In the above scheme, the QCL (Quasi Co-Location) relationship can be any one of QCL-TypeA, QCL-TypeB, QCL-TypeC, or QCL-TypeD. This means that during the switching process or CSI-RS resource configuration, the base station can choose different types of QCL relationships according to the specific scene and demand to ensure the consistency of channel state information measurement and reporting in space and time. The selection of various QCL relationships is as follows: QCL-TypeA: mainly used to indicate that the antenna ports of the reference signal have the same delay spread, Doppler spread, Doppler shift, and average delay. QCL-TypeB: used to indicate that the antenna ports of the reference signal have the same delay spread, Doppler spread, Doppler shift, and average delay. QCL-TypeC: used to indicate that the antenna ports of the reference signal have the same Doppler shift and average delay. QCL-TypeD: used to indicate that the antenna ports of the reference signal have the same spatial reception parameters. According to different network configurations, the terminal can select the corresponding measurement resources for CSI measurement and reporting based on these QCL relationships to achieve more accurate and efficient communication management. Summary: This scheme uses the non-periodic CSI measurement and reporting mechanism, combined with the switching command, so that the terminal can quickly obtain CSI information after quickly switching to the target cell, thereby ensuring efficient data transmission. At the same time, by flexibly configuring the reporting cell and CSI information, and combining different types of codebook parameter configurations, this scheme can adapt to the needs of various communication scenarios, effectively improving the reliability and flexibility of communication.

[0410] Fourth embodiment: Considerations and strategies for determining the priority of multiple candidate cell CSI reporting.

[0411] Some embodiments of the present application solve the following technical problems.

[0412] Technical problem: Design scheme and optimization strategy of CSI reporting priority under LTM.

[0413] Under the LTM (L1 / L2 triggered mobility) mechanism, when the terminal needs to report the CSI (channel state information) of multiple candidate cells before receiving the handover command, and the reporting resources are limited, how to set the reporting priority of multiple candidate cell CSI is an important problem. To ensure that key CSI information can be reported in a timely manner, the following are several possible priority setting schemes: priority based on signal quality: preferentially report the candidate cell with the best signal quality: the terminal can preferentially report the CSI of the candidate cell with the best signal quality according to the measured L1-RSRP (reference signal received power) or L1-SINR (signal-to-noise ratio). Generally, the cell with better signal quality may be the most suitable handover target, so preferentially reporting the CSI information of these cells helps the base station make a quick handover decision. Dynamic adjustment of priority: the terminal can dynamically adjust the priority of CSI reporting as the measurement results change. If the signal quality of a certain candidate cell is good in several consecutive measurements, the terminal can further increase the CSI reporting priority of this cell. Priority based on historical measurement data: priority adjustment based on historical reporting information: the terminal can determine which candidate cell has more stable CSI based on the historical CSI reporting of multiple candidate cells in the past period of time, and give these cells higher priority. For those cells with larger signal fluctuations, the CSI reporting priority can be reduced. Priority based on past handover records: if certain candidate cells have shown good communication effects in the past handover process, these cells can be assigned higher priority to increase the likelihood of being selected as the handover target. Network policy-based priority: network-configured priority rules: the network side can configure the CSI reporting priority of different candidate cells for the terminal through RRC signaling. For example, the network can specify certain cells as high-priority candidate cells according to the needs of load balancing, power management or specific scenarios (such as indoor and outdoor environments), and the terminal reports CSI according to these priority settings. Priority based on load and resource allocation: the network side can also dynamically adjust the priority of CSI reporting according to the load of each cell. For cells with lighter load, the terminal can preferentially report the CSI information of these cells to promote load balancing. Priority based on cell type: preferentially report the CSI of macro cells: in some network deployment scenarios, macro cells generally have larger coverage and more stable signals, so the terminal can preferentially report the CSI information of macro cells to ensure that the network can quickly select cells with wider coverage for handover. Priority difference based on cell type: for heterogeneous network environments (such as the coexistence of macro cells and micro cells), the terminal can set different reporting priorities according to the differences in cell type. Generally, macro cells can be set as high priority, while candidate cells in micro cells or hotspot areas can be set as priority according to demand. Priority based on measurement conditions: priority based on measurement reliability and frequency: the terminal can adjust the priority according to the measurement reliability and frequency of the candidate cell.If the measurement results of a certain cell are reliable and stable, the terminal can preferentially report the CSI information of this cell. At the same time, for cells with higher measurement frequency, their priority can be reduced to avoid repeated reporting. Priority based on interference environment: In an environment with high interference, the terminal can preferentially report the CSI of candidate cells with less interference to help the network make better decisions on handover targets. Priority based on time and distance: Priority based on the distance between the terminal and the candidate cell: The terminal can set the reporting priority according to the distance from the candidate cell. Cells with shorter distances usually have stronger signals and higher handover success rates, so preferentially reporting the CSI of these cells helps improve handover efficiency. Priority based on time limit: If the handover time is urgent, the terminal can preferentially report the CSI of candidate cells with better signal quality based on the remaining time to ensure that the handover proceeds smoothly. Priority combining multiple strategies: Comprehensive priority setting: The above multiple priority strategies can be combined to set a comprehensive CSI reporting priority rule according to the actual scene. For example, the terminal can give priority to the cell with the best signal quality while referring to historical reporting data and network-configured priority to ensure that critical CSI information is reported in a timely manner. In summary, in the LTM scenario, when the terminal needs to report the CSI of multiple candidate cells and the reporting resources are limited, the CSI reporting priority can be set in the following aspects: priority based on signal quality, priority based on historical measurement data, priority based on network strategy, priority based on cell type, priority based on measurement conditions, priority based on time and distance. By reasonably setting the CSI reporting priority, the network can prioritize obtaining the most critical CSI information under resource constraints to ensure the stability and efficiency of communication during handover.

[0414] Based on the third or ninth embodiment, if the terminal needs to report the CSI of multiple cells before cell handover, the priority of CSI reporting needs to be considered when the reporting resources are limited, and at least one of the following methods can be considered. When reporting the CSI of multiple candidate cells, the priority setting is crucial, especially in the case of limited resources, the reporting order of the CSI needs to be reasonably arranged. The following are the factors and strategies for determining the priority of reporting the CSI of multiple candidate cells:

[0415] Priority based on channel quality: Channel quality (L1-RSRP / L1-SINR): Generally, the CSI of the candidate cell with the best channel quality (such as L1-RSRP or L1-SINR) is preferentially reported. This ensures that the network can prioritize obtaining information about cells with high-quality channels to optimize data transmission. Reporting order: Cells with high channel quality are preferentially reported, followed by cells with low channel quality.

[0416] Applicable scenario: This strategy can maximize data transmission efficiency when the channel quality of multiple candidate cells differs significantly.

[0417] Based on the importance of cells: Serving cell vs candidate cell: In the handover scenario, the CSI reporting of the serving cell (the currently connected cell) is usually prioritized over the CSI of the candidate cell, especially when the handover decision has not been completed. This is because the channel information of the serving cell directly affects the quality of the current communication. Reporting order: serving cell > candidate cell. Applicable scenario: Especially suitable for the handover process, when the network needs to maintain the stability of the current communication link.

[0418] Based on network-configured priority: Predefined priority order: The network can configure a specific CSI reporting priority through RRC / MAC CE / DCI. The network side configures a priority value for each candidate cell, and the terminal decides the CSI reporting order according to the value. Reporting order: CSI reporting is performed from high to low according to the network-configured priority value. Applicable scenario: When the network side has prioritized the cells according to the strategy, load, and demand, the terminal follows the priority for reporting.

[0419] Based on beam measurement results: Beam measurement: In the candidate cell, the CSI related to beam measurement is prioritized, especially those high-quality beams based on SSB or CSI-RS beam measurement. If the channel state of a certain beam (such as L1-RSRP or L1-SINR) in a certain candidate cell is the best, the CSI of that cell is prioritized. Reporting order: High-quality beams in beam measurement are prioritized for reporting. Applicable scenario: When the terminal needs to perform multi-beam measurement, and the beam channel state has a direct impact on network decision-making.

[0420] Based on the priority of handover urgency: Emergency handover cell priority: If a certain candidate cell is about to become the target of handover, or the terminal has received a handover instruction, the CSI of that cell is prioritized for reporting to ensure the communication efficiency after handover. Reporting order: Cells that are about to be handed over are prioritized for reporting. Applicable scenario: In the handover process, especially in high-speed mobile environments, when the handover is urgent, this strategy can speed up the handover process and reduce the handover interruption time.

[0421] Based on the priority of reporting overhead: CSI reporting overhead: In limited reporting resources (such as PUSCH resources), it may not be possible to report the CSI of all cells simultaneously. In this case, the cell with smaller overhead is prioritized for reporting. The reporting overhead depends on the format, content (such as the complexity of PMI, RI, CQI), codebook type, etc. of the CSI. Reporting order: Cells with small reporting overhead are prioritized, followed by cells with large reporting overhead. Applicable scenario: Resource-constrained scenarios, such as when the network is highly loaded or the terminal has limited processing capacity.

[0422] Priority based on cell load or service demand: Network load and service demand: The network can set the priority of CSI reporting according to the load of different cells or specific service demand. For example, high-load cells may require more channel information, or prioritize CSI reporting for candidate cells for high-priority services such as video calls. Reporting order: Cells with high load or high service demand are prioritized for reporting. Applicable scenario: When the load of some cells is high or there is specific service demand, the network can adjust the priority to ensure that the CSI of key cells is reported in a timely manner.

[0423] Dynamic adjustment of priority: Real-time adjustment of priority: According to the real-time channel state and network demand, the terminal can dynamically adjust the priority of CSI reporting for candidate cells. For example, when the channel state changes, the CSI of the cell with better channel state is prioritized. Reporting order: dynamically adjusted according to the real-time changes in channel state and network demand. Applicable scenario: fast-changing network environment, such as high-speed mobile user scenarios or bursty service demand scenarios.

[0424] In the CSI reporting process of multiple candidate cells, priority can be determined by various factors, including channel quality, network configuration, beam measurement, handover urgency, reporting overhead, etc. In order to ensure that the network can obtain important cell information in a timely manner, it is crucial to prioritize the reporting of CSI information for cells that have a greater impact on communication quality and network decision-making. In different scenarios, the priority strategy can be flexibly adjusted to meet the needs of communication and the network.

[0425] Based on Embodiment Three, if the terminal needs to report the CSI of multiple cells before cell switching, and the reporting resources are limited, the priority of CSI reporting can be divided by the following schemes:

[0426] Scheme One: Priority based on candidate cell index ID or CSI-RS resource index:

[0427] The terminal can determine the priority of CSI reporting according to the index ID of the candidate cell or the size of the CSI-RS resource / resource set index. The smaller or larger the candidate cell ID or CSI-RS resource index is (according to network configuration), the higher the priority of the corresponding CSI reporting. Application scenario: This scheme is suitable for the case where candidate cells with smaller indices are prioritized by the network side.

[0428] Scheme two: Priority based on RI (Rank Indicator) information: According to the Rank value (RI) information reported by the candidate cell, the priority of CSI reporting is determined. Among the L candidate cells reported by the terminal, the cell with the larger / smaller RI value has a higher priority for CSI reporting. This is because the RI value represents the number of independent data streams supported by the channel, and a larger RI value usually means higher transmission efficiency. Application scenario: This scheme can be used in cases where the RI value is crucial to channel capacity and transmission efficiency.

[0429] Scheme three: Priority based on wideband CQI (Channel Quality Indicator) information: The priority of CSI reporting is determined based on the wideband CQI information of the candidate cell. The cell with a larger wideband CQI value has a higher priority for CSI reporting. CQI reflects channel quality, and a higher CQI means better channel conditions and the ability to support higher MCS levels. Application scenario: This scheme is suitable for scenarios where the network wants to prioritize the information of the candidate cell with the best channel quality.

[0430] Scheme four: Priority based on L1-RSRP or L1-SINR beam measurement results: The priority of CSI reporting is determined based on the beam measurement results (such as L1-RSRP or L1-SINR) reported by the candidate cell. For each candidate cell, the maximum L1-RSRP or L1-SINR value measured from multiple beams is selected, and the priority is determined based on this value. The cell with a larger L1-RSRP or L1-SINR has a higher priority for CSI reporting. Application scenario: This scheme can be used when beam quality directly determines cell switching decisions.

[0431] Scheme five: Priority based on network-side indication: The network side can explicitly indicate that the CSI of certain candidate cells must be reported first, while the priority of other cells is determined by the terminal based on the previous schemes (schemes one to four). The candidate cells explicitly indicated by the network have higher priority, and the terminal reports according to the indication. If multiple cells are indicated to be reported first, the terminal can determine the priority order of these cells based on schemes one to four. Application scenario: This scheme can prioritize network needs when the network side has special requirements (such as when certain cells have high load or resource constraints).

[0432] Scheme six: Priority based on reporting overhead: The priority of CSI reporting is determined based on the size of the reporting overhead of the candidate cell. The cell with larger / smaller reporting overhead has a higher / lower priority for CSI reporting. Reporting overhead includes transmission resource occupation, processing capacity, etc., and can be dynamically adjusted according to the complexity of the cell. Application scenario: In resource-limited scenarios, when reporting overhead needs to be considered, this scheme can effectively manage resource allocation.

[0433] Scheme seven: if multiple CSI information reported contains the CSI corresponding to the serving cell / beam / CSI-RS resource and candidate cell / beam / CSI-RS resource pair, the reporting priority of the CSI corresponding to the candidate cell / beam / CSI-RS resource pair is higher; or the reporting priority of the CSI corresponding to the serving cell / beam / CSI-RS resource is higher.

[0434] Scheme eight: if multiple CSI information reported contains multiple cells or beams or CSI-RS resources corresponding to different events, the reporting priority of the CSI can adopt at least one of the following ways, and if the reported CSI is not associated with a certain event, the corresponding priority is skipped.

[0435] Method one: the standard can agree or configure the reporting priority of the event corresponding CSI through the network side, for example, the priority of the event that is related to both the serving cell and the candidate cell is the highest; the priority of the event related to the serving cell only is the second; and the priority of the event related to the candidate cell only is the lowest; so the priority from high to low is {LTM3, LTM5, LTM2, LTM4}; or the priority from high to low is {LTM5, LTM3, LTM2, LTM4}.

[0436] Method two: the standard can agree or configure the reporting priority of the event corresponding CSI through the network side, for example, the priority of the event that is related to both the serving cell and the candidate cell is the highest; the priority of the event related to the candidate cell only is the second; and the priority of the event related to the serving cell only is the lowest; so the priority from high to low is {LTM3, LTM5, LTM4, LTM2}; or the priority from high to low is {LTM5, LTM3, LTM4, LTM2}.

[0437] Method three: the standard can agree or configure the reporting priority of the event corresponding CSI through the network side, for example, the priority of the event related to the serving cell is the highest, the priority of the event that is related to both the serving cell and the candidate cell is the second, and the priority of the event related to the candidate cell only is the lowest; so the priority from high to low is {LTM2, LTM3, LTM5, LTM4}; or the priority from high to low is {LTM2, LTM5, LTM3, LTM4}.

[0438] Comprehensive priority division: in some cases, a single reference information may not be able to distinguish the CSI reporting priority, at this time, multiple schemes can be combined to divide the priority. For example, if the RI values of multiple candidate cells are the same, the priority can be further refined according to L1-RSRP, L1-SINR or wideband CQI information. Application scenario: when multiple cells are difficult to distinguish on a certain priority reference information, this comprehensive scheme can be used for more detailed division.

[0439] CSI reporting content: The above priority scheme can be applied to different parts of the reported CSI, including CSI part 1 information (such as CQI, RI, PMI) or CSI part 2 information (more detailed channel state information), or can be uniformly prioritized without distinguishing different parts of the CSI.

[0440] Priority of serving cell: Processing of serving cell: The current serving cell can be included in the candidate cells or not. If the current serving cell is included, it should usually be given the highest priority, because the channel quality of the serving cell directly affects the handover decision. Serving cell priority: The CSI reporting priority of the current serving cell is usually the highest, and then the priority of other candidate cells is divided according to the above scheme. Without the serving cell: If the serving cell is not included in the candidate cells, the CSI priority of the serving cell is still high, and the CSI priority of the remaining candidate cells is determined according to the above scheme.

[0441] When reporting the CSI of multiple candidate cells, the terminal can select according to different priority strategies. Whether based on cell index, RI information, wideband CQI, beam measurement result, or network side indication and reporting overhead, each scheme can adapt to specific network requirements and scenarios. When a single reference information cannot distinguish the priority, the terminal can further divide the priority by combining multiple reference information. In addition, the CSI of the serving cell is usually given priority to ensure the continuity and stability of communication.

[0442] Fifth embodiment: CSI processing time (CSI Procession Time).

[0443] Some embodiments of the present application solve the following technical problems.

[0444] Technical problem: Problem of CSI processing time under LTM.

[0445] In the LTM (L1 / L2 triggered mobility) scenario, the non-periodic CSI (channel state information) measurement and reporting involves multiple technical details, especially the definition of CSI processing time and the optimization of multiple candidate cell CSI processing. The following is a detailed analysis and possible solutions for CSI processing time and related issues: Definition of the starting time of CSI processing time: In the LTM scenario, the trigger of CSI-RS (channel state information reference signal) resources may occur before the handover command or be issued together with the handover command. For the processing time of CSI, the definition of its starting time is crucial, especially when the existing standard only supports DCI (downlink control information) based triggering. Therefore, the following points need to be further defined and clarified: CSI triggering method based on DCI or MAC CE: Although the existing standard only supports triggering CSI measurement and reporting through DCI, in the future, it may be necessary to add support for CSI triggering in MAC CE signaling. This will provide more options for flexible configuration, especially in the handover scenario, making the triggering method of CSI more diverse. Starting time of CSI processing time: For non-periodic CSI measurement and reporting, the starting time of processing time can be defined according to the last symbol of the CSI-RS resource. Specifically, when the CSI trigger is completed by DCI or MAC CE signaling, the starting point of the processing time should be calculated from the last OFDM symbol of the closest CSI-RS measurement resource. Triggering time before and after handover: In the LTM handover process, if the CSI-RS trigger occurs before the handover command, the CSI processing can be performed before the handover. If the CSI-RS trigger is issued at the same time as the handover command, the starting point of the processing time should be associated with the time of the handover completion, ensuring that the CSI feedback is performed as soon as possible after the handover. Definition of CSI processing time Z': According to the existing standard, the processing time Z' of CSI is defined as the period from the last symbol of the nearest CSI-RS measurement resource. However, for the CSI reporting of multiple candidate cells, it is not necessary to report the CSI of all candidate cells, so the definition of Z' and the selection of processing time can be further optimized: Determine Z' according to the CSI of the candidate cells to be reported: For multiple candidate cells, the terminal may only need to report the CSI of part of the cells. Therefore, the starting time of Z' should be defined according to the last symbol of the CSI-RS measurement resource of the candidate cell to be reported. This can reduce unnecessary processing delay and ensure that the network can prioritize the acquisition of the most relevant CSI information. Differentiated Z' processing: The CSI measurement resources of different candidate cells may have different triggering times, so the definition of processing time Z' should allow different candidate cells to independently process CSI according to the triggering of their CSI-RS measurement resources. This differentiated processing can improve the flexibility of the network while reducing the delay of CSI processing and reporting.Terminal simultaneous calculation of multiple candidate cell CSI: For the terminal, it may need to calculate the CSI of multiple candidate cells simultaneously in the LTM scenario. At this time, the calculation time of CSI and the definition of processing unit need to be further optimized and clarified: Parallel calculation of multiple candidate cell CSI: In order to improve efficiency, the terminal may need to calculate the CSI of multiple candidate cells in parallel. This requires clear definition of the terminal's CSI processing unit design to ensure effective allocation of processing resources. For example, a multi-processing unit architecture can be introduced inside the terminal to enable simultaneous processing of the CSI of multiple candidate cells, reducing processing latency. Definition of CSI processing unit: The CSI processing unit inside the terminal needs to be further clarified. Each processing unit is responsible for calculating the CSI information of one or more candidate cells to ensure that all necessary calculations can be completed within the processing time Z'. The allocation of processing units can be dynamically adjusted according to the number of candidate cells, the complexity of the channel state, and the availability of computing resources. Coordination of processing time: When processing the CSI of multiple candidate cells simultaneously, the terminal needs to coordinate the processing time of each cell to ensure that all CSI calculations can be completed within the specified processing time Z'. At this time, different priority processing strategies can be introduced to prioritize the CSI of candidate cells with better signal quality to ensure timely reporting of important information. Possible optimization schemes: Optimized CSI triggering mechanism: The DCI triggering in the existing standard can be further expanded to support the CSI triggering mechanism in the MAC CE signaling, making the triggering of CSI measurement and reporting more flexible, especially in the LTM scenario, which can activate CSI-RS measurement more quickly according to actual needs. Flexible definition of CSI processing time: In order to adapt to the CSI processing of multiple candidate cells, the processing time of CSI should allow independent processing of different candidate cells, and Z' should be defined according to the CSI-RS resources of the candidate cells that need to be reported. This flexibility can reduce unnecessary delays and improve network response speed. Optimization of multi-candidate cell CSI processing unit: Parallel processing architecture can be introduced inside the terminal to improve CSI calculation efficiency. By dynamically allocating processing units, the terminal can flexibly respond to the calculation needs of different numbers of candidate cell CSI, ensuring that all calculations can be completed within the specified time. Conclusion: In the LTM, the measurement and reporting of non-periodic CSI pose new requirements for the start time of CSI processing time, the definition of Z', and the CSI processing of multiple candidate cells. By introducing flexible CSI triggering mechanisms, differentiated processing time definitions, and parallel calculation architectures for multiple candidate cells inside the terminal, the efficiency of CSI measurement and reporting can be significantly improved. These optimization schemes help to reduce the handover delay in the LTM scenario and ensure that the network can quickly obtain accurate CSI information during the handover process.

[0446] CSI processing time refers to the time required for a terminal to complete CSI feedback from receiving CSI-RS (Channel State Information Reference Signal). In a wireless communication system, CSI feedback is very important for link adaptation scheduling of the base station, so it is necessary to define the definition and calculation method of CSI processing time.

[0447] In wireless communication standards such as NR and 5G, the processing time of CSI is usually determined by two key parameters:

[0448] Z: indicates the parsing time of DCI: DCI (Downlink Control Information) refers to the control signal transmitted by the base station to the terminal, which is used to instruct the terminal to perform various operations, such as resource scheduling, HARQ feedback, etc. The value of Z represents the time required for the terminal to parse the DCI, and within this time period, the terminal reacts according to the content indicated by the DCI and starts related operations, such as preparing CSI measurement or performing CSI reporting, etc.

[0449] Z': indicates the CSI measurement and processing time: the value of Z' represents the time required for the terminal to complete CSI measurement and processing after preparation for reporting. Z' includes the process of the terminal receiving CSI-RS signal and performing measurement, calculating PMI, CQI, RI, etc. information, and finally generating CSI reporting content. The starting point of Z' is usually the time when the terminal receives the last CSI-RS symbol.

[0450] Calculate the CSI processing time: the calculation of the CSI processing time is usually as follows:

[0451] Z+Z': the total CSI processing time is equal to the time z required for the terminal to parse the DCI, plus the time Z' required to complete the CSI measurement and calculation. Z represents the time required for the terminal to parse and respond to the DCI. Z' represents the time from the terminal receiving the last CSI-RS symbol to completing the CSI calculation and preparing for feedback. In the standard, different types of CSI codebooks, channel conditions and resource configurations will affect the length of the CSI processing time. For example, in 5G NR, with the development of the protocol, the specific values of Z and Z' will have different value requirements for different versions (such as Rel-15, Rel-16, Rel-17).

[0452] Processing time for aperiodic CSI: In the context of aperiodic CSI, the triggering and measurement of CSI-RS resources can be delivered before or together with the handover command. The existing standard typically triggers aperiodic CSI-RS measurement resources through DCI, so the starting time of CSI processing time is usually referenced by the DCI delivery. If MAC CE is used to trigger CSI-RS resources, the definition of the starting time may need to be re-adapted.

[0453] Multi-cell CSI processing time: When the terminal needs to measure and report the CSI of multiple cells simultaneously, the CSI processing time needs to consider the CSI measurement and calculation of multiple candidate cells. Therefore, the terminal may need to calculate the CSI of each cell in parallel during CSI processing, and the processing time will vary according to the number of cells measured simultaneously, the number of CSI-RS resources configured for each cell, etc.

[0454] Factors affecting CSI processing time: Codebook complexity: The processing time of complex codebook types (such as Type-II) will be longer because more channel parameters need to be processed. Number of antenna ports: The more antenna ports used for CSI-RS measurement, the longer the processing time. Sub-band granularity: The finer the granularity of CSI feedback sub-bands, the greater the processing burden on the terminal, and the CSI processing time will also be extended. Number of parallel processing candidate cells: Measuring the CSI of multiple cells simultaneously increases the processing time.

[0455] Strategies to optimize CSI processing time: To reduce CSI processing time and improve system response speed, the following strategies can be adopted: Parallel computing: The terminal can reduce processing delay by parallel processing of CSI measurement of multiple cells or beams. Reducing codebook complexity: In high-priority or resource-constrained scenarios, the complexity of the CSI codebook can be reduced to speed up CSI feedback. Dynamic adjustment of CSI measurement resources: Based on network status, dynamically adjust the allocation of CSI-RS resources to avoid unnecessary resource waste and reduce CSI measurement burden.

[0456] Actual application scenarios: Handover scenario: When the terminal switches from one cell to another, it usually needs to quickly obtain the CSI of the new cell for the base station to perform adaptive scheduling. In this process, short CSI processing time can speed up the recovery speed after switching and reduce communication interruption time. High-speed mobile scenario: In high-speed mobile scenarios, the channel changes quickly, and the base station needs to frequently obtain the CSI of the terminal. Shorter CSI processing time can improve the adaptability of the network. Massive MIMO scenario: In a large-scale MIMO system, the terminal usually needs to process a large number of CSI-RS resources, so how to optimize the CSI processing time is the key to improving the performance of the system.

[0457] CSI processing time is the time required for a terminal to receive a CSI-RS signal and feed back CSI information, including DCI parsing time and CSI measurement and calculation time. Different channel conditions, CSI-RS resource configurations, codebook types and other factors will affect the CSI processing time. In practical applications, shortening the CSI processing time is crucial to improving system response speed and optimizing communication quality, especially in scenarios such as cell switching, high-speed movement and large-scale MIMO.

[0458] For aperiodic CSI reporting, when the codebook type is Type-I and Type-II codebook, the processing time of CSI for a serving cell can be represented by Z2 and Z'2, where Z2 represents the time interval from the last symbol of the PDCCH triggering the aperiodic CSI-RS transmission to Z2, and Z'2 represents the time interval from the last symbol of the CSI-RS measurement resource to Z'2. The final CSI processing time is the later one of Z2 and Z'2, i.e. the CSI measurement must be completed before the end point.

[0459] For the measurement of CSI for a candidate or target cell, the CSI processing time can be determined by at least one of the following schemes:

[0460] Scheme one: for the measurement of CSI for a candidate or target cell, if the CSI measurement resource is aperiodic, based on embodiment three, the trigger of the aperiodic CSI measurement resource of the target cell can be issued at the same time as the handover command, and the handover command can be carried on the MAC CE or DCI, so the CSI calculation delay can be defined as the time interval from the last symbol of the PDCCH carrying the handover command to Z2. If the handover command is carried on the PDSCH, Z2 represents the time interval from the last symbol of the PDSCH carrying the handover command and triggering the aperiodic CSI-RS resource to Z2. The definition of Z'2 remains the same, which is the time interval from the last symbol of the CSI-RS measurement resource to Z'2. Therefore, the CSI processing time is still the later one of Z2 and Z'2, i.e. the CSI measurement must be completed before the end point.

[0461] Scheme two: for the case that CSI of candidate cells is reported before handover command, the terminal can need to report CSI of multiple candidate cells in one reporting instance, and the non-periodic CSI-RS resource of multiple candidate cells is triggered by the same DCI or MAC CE signaling of the serving cell. Therefore, the starting time of the Z2 time period can be the last symbol of the PDCCH signal or the last symbol of the PDSCH signal carrying the trigger of the non-periodic CSI-RS resource. And the starting time of the Z'2 time period can be the latest time domain symbol of the CSI-RS measurement resource of all candidate cells, including the current serving cell, for CSI feedback. Therefore, the processing time of the CSI still ends at the later one of the Z2 and Z'2 time points, that is, the measurement of the CSI must be completed before the end point.

[0462] Scheme three: for the case that CSI of candidate cells is reported before handover command, the terminal can need to report CSI of multiple candidate cells in one reporting instance, and the non-periodic CSI-RS resource of multiple candidate cells is triggered by the same DCI or MAC CE signaling of the serving cell. Therefore, the starting time of the Z2 time period can be the last symbol of the PDCCH signal or the last symbol of the PDSCH signal carrying the trigger of the non-periodic CSI-RS resource. And the starting time of the Z'2 time period can be the latest time domain symbol of the CSI-RS measurement resource of the candidate cell, including the current serving cell, for CSI feedback. Therefore, the processing time of the CSI still ends at the later one of the Z2 and Z'2 time points, that is, the measurement of the CSI must be completed before the end point.

[0463] Note that the values of Z2 and Z'2 can reuse the CSI computation latency requirement 2 in Table 5.4.2 in the existing standard 38.214, or a new table can be defined, in which case the values of Z2 and Z'2 under different values of μ can be different from the values of the CSI computation latency requirement 2 in Table 5.4.2 in 38.214, or the value of Z2 is different from the CSI computation latency requirement 2 in Table 5.4.2 in 38.214, for example, greater than or less than the value in the existing table under the same μ, while the value of Z'2 is the same as the CSI computation latency requirement 2 in Table 5.4.2 in 38.214.

[0464] In addition, if the μ values of the candidate serving cells and the current serving cell are different and / or the μ values of different candidate cells are different, in fact, it does not affect the actual values of Z2 and Z'2, which can only correspond to different values of μ in the computation latency requirement table; the values of Z2 and Z'2 can be obtained with reference to the μ value of any one of the candidate cells or the current serving cell.

[0465] Secondly, the time delay values Z2 and Z'2 are calculated based on the defined CSI, and considering that the terminal may need to calculate the CSI of multiple candidate cells at the same time, the terminal can calculate the calculation time of the CSI by using at least one of the following schemes:

[0466] Scheme one: since the terminal needs to calculate the CSI of multiple candidate cells, the calculation time of the CSI can be (Z2, Z'2) or (Z2+Z'2, 2Z'2), and at this time the number of candidate cells that need to report the CSI is not more than N, and N can take at least one of the maximum values {4, 5, 6, 7}.

[0467] Scheme two: since the terminal needs to calculate the CSI of multiple candidate cells, the calculation time of the CSI is related to the number of candidate cells, when the number of candidate cells is not more than a certain value N (N≤4), it can be (Z2+Z'2, 2Z'2), when the number of candidate cells is greater than N, it can be (Z2+2Z'2, 3Z'2).

[0468] Sixth embodiment: CSI-RS based L1-SINR reporting (CSI-IM & CSI-RS resource configuration and constraints).

[0469] Some embodiments of the present application solve the following technical problems.

[0470] Technical problem: main constraint condition of candidate cell CSI-IM resource configuration.

[0471] In the prior art, if the terminal supports SINR (signal-to-noise ratio) reporting based on CSI-RS measurement, the candidate cell needs to configure CSI-IM resources or NZP CSI-RS measurement resources for the terminal to perform interference measurement. Therefore, the following problems need to be considered and configured in detail: configuration of interference measurement resources: to support the terminal to perform interference measurement, the candidate cell can configure CSI-IM resources or NZP CSI-RS measurement resources for the terminal. The configuration mode of these resources needs to be clear: is it to configure multiple candidate cell measurement resources in the same resource set, or to configure an independent resource set for each candidate cell? Is there a specific rule for the mapping relationship between CSI-RS resources and CSI-IM resources to ensure the coordination of different resource sets and avoid resource conflicts. Time-frequency domain constraints: in order to ensure the fairness of multiple candidate cells in L1-SINR measurement, it is necessary to ensure that the resources used for measurement have consistency in time-frequency domain. This includes: the time interval of the L1-SINR measurement resources of multiple candidate cells cannot be too large, in order to ensure the timeliness and consistency of the measurement results. The serving cell and the candidate cell should use the same CSI-IM pattern or other measurement configuration to ensure the similarity of the measurement conditions, so as to ensure the fairness of the measurement results. This can be achieved by configuring the same measurement pattern among multiple cells or adopting a consistent resource allocation strategy, thereby reducing the error between measurements and ensuring the accuracy and comparability of measurement data. Mapping relationship of measurement resources: an effective mapping relationship needs to be established between CSI-RS resources and CSI-IM resources to ensure that the terminal can accurately perform interference measurement and channel state estimation. This mapping relationship needs to consider the time-frequency domain distribution of resources, the coordination of resource allocation, and the effectiveness of avoiding interference. Cross-cell resource coordination: since the measurement resources are issued by the candidate cell, and the measurement or reporting trigger signal is issued by the serving cell, in order to ensure the effectiveness of the measurement, inter-cell coordination is needed. In summary, to support SINR reporting based on CSI-RS measurement, the candidate cell needs to reasonably configure CSI-IM or NZP CSI-RS measurement resources, and when allocating resources, the selection of resource sets, time-frequency domain constraints, and resource mapping relationship should be considered to ensure the measurement fairness and consistency between different cells. This is of great significance to improve the accuracy of interference measurement and network performance.

[0472] In the current 3GPP Rel-18 standard, L1-RSRP (Reference Signal Received Power) reporting based on SSB measurement is supported, but this SSB-based measurement has some limitations, such as not considering interference and SSB only occupying part of the bandwidth. Therefore, in Rel-19, as one of the candidate research contents, L1-SINR (Signal to Interference plus Noise Ratio) reporting based on CSI-RS (Channel State Information Reference Signal) measurement is introduced. The focus of this embodiment is to support L1-SINR reporting based on CSI-RS, while clearly defining the configuration scheme of CSI-RS resources and CSI-IM (Interference Measurement Reference Signal) resources, which includes the following ways:

[0473] Scheme one: Resource configuration: when the serving cell configures L1-SINR measurement resources for the terminal, it can configure two resource sets for each candidate cell: the first resource set is used for channel measurement (through SSB or NZP CSI-RS resource). The second resource set is used for interference measurement (through CSI-IM resource or NZP CSI-RS resource). Resource association: each SSB or NZP CSI-RS resource used for L1-SINR measurement is associated with a CSI-IM resource or a NZP CSI-RS resource. The association is realized through the index or order in the resource set. The number of resources used for L1-SINR measurement and the number of resources used for interference measurement are equal.

[0474] Scheme two: Resource configuration: all L1-SINR measurement resources (CSI-RS or SSB) of all candidate cells can be grouped into one resource set, and all interference measurement resources (CSI-IM or NZP CSI-RS) of all candidate cells can be grouped into another resource set. Resource association: similarly, each CSI-RS or SSB resource used for L1-SINR measurement is associated with a CSI-IM resource or a NZP CSI-RS resource, and the association is realized through the index or order. The number of resources used for L1-SINR measurement and the number of resources used for interference measurement remain consistent.

[0475] Fairness and configuration constraints: in order to ensure the fairness of candidate cell SINR measurement, the following constraints need to be considered:

[0476] Pattern consistency: the configuration pattern of CSI-IM resources of different candidate cells should be the same as the serving cell, or can be different according to the situation.

[0477] Antenna port consistency: the number of antenna ports of CSI-RS and / or CSI-IM resource configuration of different candidate cells should be consistent, or can be different according to the configuration.

[0478] Frequency resource consistency: the number of RBs (resource blocks) occupied by the CSI-IM resource of the candidate cell and the CSI-IM resource of the serving cell in the frequency domain should be consistent, or can be different.

[0479] Time domain behavior consistency: the time domain behavior of the CSI-IM resource of different candidate cells and the serving cell can be periodic, semi-persistent or aperiodic, and should be consistent, or can be different as needed.

[0480] Time domain location consistency: the CSI-IM resource of the candidate cell and the serving cell can be located in the same time slot or adjacent time slots, or located in the same time window for measurement, to ensure that the measurement is completed within the coherence time of the channel.

[0481] Power offset consistency: the CSI-RS reference resources of different candidate cells can be configured with the same power offset (powerControlOffsetSS) to ensure that the CSI-RS resources of different cells have the same transmit power.

[0482] Periodicity and time domain behavior: periodicity consistency: the periodicity of the CSI-RS resource for SINR measurement and the periodicity of the CSI-IM resource should be consistent, i.e. both are periodic, semi-persistent or aperiodic resources.

[0483] Resource set configuration: resource set sharing between serving cell and candidate cell: the CSI-RS and / or CSI-IM resources of the serving cell can be configured separately or shared with the candidate cell in one resource set, and the specific configuration can be determined by the network side or predefined by the standard.

[0484] Resource set size: each cell can only configure one CSI-IM resource, which is associated with all CSI-RS resources of the cell. Alternatively, the number of CSI-IM resources in the resource set can be less than the number of CSI-RS resources.

[0485] Function extension: the above CSI-RS resources are not only applicable to L1 beam measurement or mobility measurement, but also can be used for CSI-RS resources in CSI measurement. This enables the embodiment to be widely applied to channel measurement, interference evaluation and resource configuration optimization in various scenarios.

[0486] The embodiment realizes the reporting of L1-SINR based on CSI-RS by explicitly configuring the CSI-RS and CSI-IM resources, and proposes multiple resource configurations and association methods to solve the interference measurement problem between different cells, while considering the fairness and consistency of resource configuration. By reasonably configuring the CSI-RS and CSI-IM resources, the system's ability to perceive interference can be improved, the transmission efficiency can be optimized, and support can be provided for future Rel-19 standards. L1 beam measurement can refer to L1-RSRP or L1-SINR measurement based on SSB, or L1-RSRP or L1-SINR measurement based on CSI-RS.

[0487] Seventh embodiment: event-based LTM reporting.

[0488] Some embodiments of the present application solve the following technical problems.

[0489] Technical problem: optimization scheme and bearing mode design of event-based L1 measurement reporting combined with CSI-RS measurement.

[0490] In the scenario of event-based L1 measurement reporting, the terminal needs to consider how to effectively report both cell-level L1 measurement and beam-level measurement. To ensure the robustness of cell switching, avoid ping-pong effect and maintain high communication speed, the combination of event-based L1 measurement reporting and CSI-RS measurement reporting is particularly important. The following is a detailed analysis of this issue and possible solutions: Which L1 measurement of which cell and beam to report: Event-based L1 measurement triggering can support multiple event types, such as the beam measurement value of the serving cell being lower than a certain threshold, the beam measurement value of the candidate cell being higher than a certain threshold, etc. In the case of meeting one or more events, it is necessary to determine which L1 measurement of which cell and / or beam to report. Prioritize reporting L1 measurement of cells that meet event conditions: When multiple events trigger, the terminal should prioritize reporting L1 measurement of cells that meet event conditions. For the case of multiple cells triggering at the same time, the better cells can be prioritized according to the importance of measurement results. Dynamically adjust the reporting range: The number of reported cells should be dynamically adjusted according to the actual network conditions. If the network load is high, the terminal can choose to report only the L1 measurement of the best cell to reduce reporting overhead. In the case of low network load, more candidate cells can be reported to ensure that the network has more information to refer to when switching. Which beam measurement to report: Based on the reporting of cells, the terminal also needs to report which beam measurement under that cell. To ensure the accuracy of beam selection, the terminal can report in combination with the beam information of CSI-RS measurement. Prioritize reporting the best beam: For multiple beams in a cell, the terminal can prioritize reporting the beam with the best signal quality (e.g., based on L1-RSRP or L1-SINR). If the signal quality of multiple beams is similar, the terminal can report the measurement of multiple beams to help the base station select the best beam. Combine CSI-RS beam measurement: Combining L1 measurement with CSI-RS beam measurement can better evaluate the signal quality of the beam. The terminal can report the beam measurement based on CSI-RS at the same time as reporting L1 measurement. This combination helps to reduce the overhead of repeated measurement and improve the accuracy and efficiency of beam selection. Combination of event-based L1 measurement reporting and CSI-RS measurement reporting: To improve the accuracy of measurement and reduce the overhead of reporting, event-based L1 measurement reporting can be combined with L1 beam measurement based on CSI-RS measurement and CSI reporting. L1 beam measurement can refer to SSB-based L1-RSRP or L1-SINR measurement, or CSI-RS-based L1-RSRP or L1-SINR measurement. In this scenario, the content of measurement and reporting may be different: Reduce redundant information reporting: When L1 measurement is combined with CSI-RS measurement, redundant beam and cell measurement reporting can be reduced.The terminal can report only the cells and beams that meet the event conditions based on event triggering, without the need to report all measurement results. Dynamic selection of reporting content: according to the current needs of the network, the terminal can select to report key information in the L1 measurement results or CSI-RS measurement results. For example, when the handover conditions are clear, the terminal can only report the L1 measurement of the optimal beam, reducing unnecessary reporting overhead. Dynamic reporting quantity and bearer design: the L1 measurement reporting of event triggering is dynamic, and the specific reporting quantity depends on the number of cells and beams that meet the event conditions. Therefore, the mechanism for carrying these reporting information needs to be designed flexibly to adapt to different reporting needs. Carrying through MAC CE: for the dynamic reporting of L1 measurement and CSI-RS measurement results, MAC CE (Media Access Control Layer Control Element) can be used for carrying. MAC CE can flexibly adapt to different reporting quantities and has a high priority, making it suitable for carrying event-triggered L1 measurement results and CSI reporting. Informing the base station to use MAC CE to carry the CSI measurement quantity: the existing standard mainly carries the CSI-related reporting quantity through UCI (Uplink Control Information), but in the event-triggered scenario, the terminal may need to carry the relevant measurement results of CSI through MAC CE. Therefore, the terminal needs to inform the base station through signaling (such as RRC reconfiguration message) to specify that certain CSI measurement quantities are carried through MAC CE. This can be achieved by adding corresponding indication information in the handover command or RRC configuration signaling. Optimizing the reporting process to avoid ping-pong effect: in order to ensure the robustness of handover and avoid ping-pong effect, the terminal can introduce certain thresholds and hysteresis mechanisms when reporting L1 measurement: signal quality threshold: only when the L1 measurement of the candidate cell reaches a certain threshold, the terminal will trigger reporting. By setting a higher signal quality threshold, frequent handover can be avoided. Hysteresis time mechanism: after meeting the event triggering condition, the terminal can introduce a certain hysteresis time to ensure that the signal quality is stable before reporting the L1 measurement. This can reduce the ping-pong effect caused by signal fluctuations. In summary, in the event-based L1 measurement reporting scenario, the terminal needs to flexibly select the cells and beams to report, while considering the dynamic adjustment of the reporting quantity. By combining the beam information of CSI-RS measurement, the terminal can reduce redundant reporting and improve reporting efficiency. When carrying the reporting quantity, MAC CE can be used as a flexible way to carry L1 measurement and CSI measurement, while UCI can still be used for regular CSI reporting. By introducing signal quality thresholds and hysteresis time mechanisms, ping-pong effect can be effectively avoided, and the robustness of handover can be improved.

[0491] In the current standard discussion, at least the following four key events are supported for beam measurement and cell handover decision:

[0492] Event LTM2: The beam quality of the serving cell drops to worse than a preset absolute threshold. This situation may indicate that the current connected cell signal is deteriorating, and it needs to be evaluated whether to switch to other cells.

[0493] Event LTM3: The beam quality of the candidate cell is better than that of the serving cell, and better than a certain offset. This means that the signal of some candidate cells is significantly better than the current serving cell, and it may be suitable for handover.

[0494] Event LTM4: The beam quality of the candidate cell exceeds the absolute threshold. This indicates that the signal quality of the candidate cell reaches a good level, and it can be considered to switch to this cell.

[0495] Event LTM5: The beam quality of the serving cell drops to worse than a first absolute threshold, and the beam quality of the candidate cell is better than a second absolute threshold. This double condition event trigger can be used for more accurate cell handover judgment to ensure the rationality and stability of the handover.

[0496] These events can help optimize the cell handover strategy and improve the coverage and service quality of the network. Based on the trigger conditions of these events, the terminal device will report the beam measurement results to the network, and the network will make handover or other decisions accordingly.

[0497] In embodiment 6, for L1-SINR reporting of candidate cells, four key events are defined: LTM2, LTM3, LTM4, and LTM5. The system uses different trigger conditions to determine whether the events are met based on the beam measurement results of the candidate cells and the serving cell. When these events are triggered, the terminal needs to select the appropriate candidate cell and beam for reporting according to the network configuration or the standard pre-defined rules. This embodiment not only discusses the reporting strategy of single event and multiple event triggers, but also details various reporting schemes to optimize the efficiency of terminal feedback.

[0498] Based on the above four events, this embodiment discusses the reporting amount of the terminal when the event is triggered. The beam measurement amount that the terminal may report when the event is met can be L1-RSRP or L1-SINR. The measurement amount can be obtained based on SSB measurement or CSI-RS measurement. Due to the different trigger conditions and requirements of different events, the reporting content of the terminal will also be different. Therefore, this embodiment provides several possible reporting schemes, and at least one of the following schemes can be selected in specific implementation:

[0499] Scheme one (single event, single or multiple):

[0500] Assuming that the network side configures the terminal with the number of reported cells L and the measurement results of M beams corresponding to each cell, the terminal reports according to the following steps when the event is triggered:

[0501] Event LTM2: The terminal selects L cells for reporting. The serving cell can or can not be included in the L cells. The beams reported by the serving cell can or can not include the event triggered beam.

[0502] Events LTM3, LTM4, LTM5, LTMX: If the number of event triggered cells N does not exceed L, the terminal selects L-N cells from other candidate cells for reporting. If the number of event triggered cells N exceeds L, the terminal selects L cells from the N cells for reporting. In this case, the serving cell can or can not be included in the L cells.

[0503] Beam selection for each reported cell: For each reported cell, the terminal selects M beams for reporting. The M beams can or can not include the event triggered beam.

[0504] Applicability: For other events involving candidate cell beam triggering, such as LTMX, or events involving joint triggering of candidate cell beams and serving cell beams, the terminal can select cells and beams for reporting according to the same logic. This scheme ensures the flexibility of the terminal in different event triggering, which can both determine the reported cells and beams according to the configuration, and dynamically adjust the reporting amount when the number of candidate cells and event triggering conditions change.

[0505] Scheme two (multiple events, single or multiple):

[0506] Suppose that the network side configures the terminal with the number L of reported cells and the corresponding M beams for each cell, the terminal can report according to the following steps when multiple events are triggered:

[0507] Reporting when multiple events are triggered: For at least one of the events LTM2, LTM3, LTM4, LTM5, LTMX, if the number of event triggered cells N does not exceed L, the terminal selects L-N cells from other cells for reporting.

[0508] If the number of event triggered cells N exceeds L, the terminal selects L cells from the N cells for reporting.

[0509] In this case, the serving cell can or can not be included in the L and / or N cells.

[0510] Beam selection for each cell: For each reported cell, the terminal selects M beams for reporting. The M beams can or can not include the event triggered beam.

[0511] Applicability of other events: For other events triggered by candidate cell beams or co-triggered by serving cell and candidate cell, such as LTMX, the terminal can select the reported cells and beams according to the same logic.

[0512] Processing of mandatory reporting: If the network side configures one or more cells that must be reported, or based on the standard, some events of the cell must be reported, and the number of these mandatory reported cells is C, C does not exceed L, then the terminal needs to select L-C cells from other cells for reporting. If C exceeds L, the terminal selects L cells from N cells for reporting, and the serving cell can or can not be included in the L and / or N cells.

[0513] This scheme ensures that in the case of multiple event triggering, the terminal can flexibly select the reported cells and beams, while considering the priority of the mandatory reported cells to ensure that the standard or configuration requirements are met.

[0514] Scheme three (single event, single or multiple): Assuming that the network side configures the terminal with the maximum number of reported cells L_max and the maximum number of beams M_max corresponding to each cell, for a single event or multiple events, the terminal's reporting can be performed according to the following steps:

[0515] Processing of event LTM2: When event LTM2 is triggered, the terminal selects L cells for reporting, where L takes a value of L≤L_max. The serving cell can or can not be included in the L cells. The beams reported by the serving cell can or can not include the beams that triggered the event.

[0516] Reporting for events LTM3, LTM4, LTM5, LTMX: If the number of cells triggered by the event N does not exceed L max , the terminal selects L candidate cells for reporting, where N≤L≤L max .

[0517] If the number of cells triggered by the event N exceeds L max , the terminal selects L max from the N cells that satisfy the event for reporting.

[0518] The serving cell can or can not be included in the L and / or N cells. L max of the reported cells can or can not include the serving cell.

[0519] Beam selection: For each reported cell, the terminal selects the measurement results of M beams for reporting, where M takes a value of M≤Mmax The M beams can or can not include the beam triggering the event.

[0520] Applicable to other events: For other events triggered based on candidate cell beams, such as LTMX, or other events triggered based on candidate cell and serving cell beams together, the above scheme is also applicable.

[0521] Reporting of cells: If the network side configures one or more cells that must be reported, or the standard stipulates that the cells meeting certain events must be reported, assuming the number of cells that must be reported is C, and C does not exceed L max , the terminal selects L-C cells from other cells for reporting. If C exceeds L max , the terminal selects L cells from the C cells for reporting. The serving cell can or can not be included in the L and / or C cells.

[0522] This scheme ensures that when single or multiple events are triggered, the terminal can flexibly select the cells and beams to be reported, and adjust the priority and number of reporting according to the network configuration or standard requirements.

[0523] Scheme four (multiple events, single or multiple):

[0524] Assuming the network side configures the terminal with a maximum number of cells L max to be reported and a maximum number of beams M max for each cell, the specific steps of the terminal for reporting are as follows when the following conditions are met:

[0525] Selection of cells triggered by multiple events: When multiple cells meet at least one of the events LTM2, LTM3, LTM4, LTM5, LTMX, if the total number of cells meeting the events N does not exceed L max , the terminal needs to select L-N cells from other cells for reporting, so that the total number of reported cells is L, where N≤L≤L max .

[0526] If the number of cells meeting the events N exceeds L max , the terminal selects L max cells from the N cells meeting the events for reporting. Serving cell processing: Among the reported cells, the serving cell can or can not be included in the L and / or N cells, depending on the network side configuration or standard requirements.

[0527] Beam selection: For each reported cell, the terminal needs to select M measurement results of M beams for reporting, where M≤M maxThe reported M beams can or can not contain event triggered beams, depending on the network side configuration.

[0528] Other event applicability: The above scheme is also applicable to other events involving candidate cell beam triggering (e.g. LTMX), or events involving both candidate cell and serving cell triggering. Mandatory cell handling: If the network side configures or the standard requires that certain cells must be reported (e.g. C cells), and C is no more than L max , the terminal needs to select L-C cells from other cells for reporting. If the mandatory cells C exceed L max , the terminal selects L cells from the C cells for reporting, and the serving cell can or can not be included in the L and / or C cells, depending on the network side configuration or standard definition.

[0529] This scheme ensures that when multiple types of events are triggered at the same time, the terminal can flexibly select cells and beams for reporting, meeting the network configuration requirements while ensuring that the necessary information related to the events is reported.

[0530] Scheme five (single / multiple types of events, single or multiple): Assuming that the network side configures the terminal side to report the measurement results of M or a maximum of M max beams on the reported cells, then for at least one of the events LTM2, LTM3, LTM4, LTM5, LTMX, the terminal only reports the measurement results of N beams of the cells that meet the events, N is less than or equal to the total number of candidate cells plus the serving cell, and N can or can not contain the serving cell; and for the LTM2 event, the terminal selects L cells for reporting, and the specific number can be explicitly or implicitly indicated to the network side, L is less than or equal to the total number of candidate cells plus the serving cell, and L can or can not contain the serving cell; secondly, for each reported cell, the terminal selects M beams for reporting, where M beams can or can not contain event beams, and M≤M max ;

[0531] If the network side configures a certain cell or certain cells to be reported, the terminal reports the measurement results of the mandatory cells configured by the network side in addition to the measurement results of the cells that meet the events.

[0532] Scheme six (single / multiple type events, single or multiple): for at least one event in LTM2, LTM3, LTM4, LTM5, LTMX, the terminal reports only N beam measurement results of the cells satisfying the event, N is less than or equal to the total number of candidate cells plus the serving cell, N can contain the serving cell or not; for LTM2 event, the terminal selects to report L cells, the specific number can be indicated to the network side explicitly or implicitly, L is less than or equal to the total number of candidate cells plus the serving cell, L can contain the serving cell or not; secondly, for each reported cell, the terminal only reports the measurement results of the beams satisfying the event triggering; if the network side configures a certain cell or certain cells to be reported, the terminal reports the measurement results of the cells configured by the network side to be reported in addition to the measurement results of the cells satisfying the event.

[0533] Scheme seven (single / multiple type events, single or multiple): assuming that the network side configures the terminal side to report M sum beam measurement results of all reported cells, for at least one event in LTM2, LTM3, LTM4, LTM5, LTMX, the terminal reports only N beam measurement results of the cells satisfying the event, N is less than or equal to the total number of candidate cells plus the serving cell, N can contain the serving cell or not; secondly, for the reported cells, if the total number of beams triggering the event K is not greater than M sum , the terminal reports the measurement results of the beams corresponding to the event triggering, and selects M sum -K beam measurement results for reporting; if the total number of beams triggering the event K is greater than M sum , the terminal selects M sum -K beam measurement results for reporting; wherein K can contain the beams triggering the event of the serving cell or not.

[0534] If the network side configures a certain cell or certain cells to be reported or based on the standard to meet a certain event corresponding to the cell that must be reported, and configures how many beams corresponding to the cell to be reported, or the measurement results of the event beams corresponding to the event cell must be reported, assuming that the number of beams that must be reported is B, the terminal needs to select M sum -K beam measurement results for reporting.

[0535] Scheme eight (single / multiple type events, single or multiple): assuming that the network side configures the terminal side to report M summaxmeasurement results of the beams of the N cells satisfying the event, N is less than or equal to the total number of the candidate cells plus the serving cell, N can contain the serving cell or can not contain the serving cell; second, for the reported cells, if the total number of beams K triggering the event is not greater than M summax , the terminal reports the measurement results P of the beams corresponding to the triggering event, where K≤P≤M summax ; if the total number of beams K triggering the event is greater than M summax , the terminal reports the measurement results of the M summax beams selected from the K beams; where K can contain the beams triggering the event of the serving cell or can not contain the beams triggering the event of the serving cell.

[0536] If the network side configures that one or more cells must report or is based on the standard to meet one or more events corresponding to the cells that must be reported, and configures how many beams corresponding to the cells are reported, or the measurement results of the event beams corresponding to the event cells must be reported, then assuming the number of beams that must be reported is B, the terminal needs to select P-K beams for reporting the measurement results.

[0537] In all the above schemes, LTMX refers to other events that the beams of the serving and / or candidate cells meet certain conditions.

[0538] For all the above schemes, when the network side configures the number of beams reported by each cell to be M, and the specific M beams are selected by the terminal, for the beams of the candidate cells that meet or trigger the event, the beams must be reported, and for the beams of the serving cell that meet or trigger the event, the beams can not be reported or can be reported. Or for the beams of the candidate cells that meet or trigger the event, the beams can not be reported, and for the beams of the serving cell that meet or trigger the event, the beams can not be reported or can be reported. When the network side does not configure the number of beams reported by the cells, the number of reported beams is selected by the terminal, and the terminal can inform the network side through explicit or implicit ways during the reporting process.

[0539] In all the above schemes, the value of L is any one of L∈{1, 2, 3, 4}, the value of M is any one of M∈{1, 2, 3, 4}, and the value of L and / or M is specifically configured by the network side, for example, through RRC, MAC CE or DCI.

[0540] For whether the above scheme reports the measurement results of the beams of the serving cell, it can be determined by the network side configuration, and the network side can configure through RRC / MAC CE / DCI.

[0541] For all the above schemes, if the network side does not configure the terminal to report the number of cells and / or the number of reporting beams corresponding to the reporting cells, the terminal side defaults to only reporting the cells that meet the event and / or the beam information that meets the event;

[0542] In all the above schemes, whether to report the measurement results of the serving cell beams can depend on the network side configuration. If the network side configures to report, it is reported. The above configuration can be for a certain event or for certain events, for example, the network side configures the serving cell to report for LTM Y, Y can be any of the above events; It can also be decided by the terminal itself and can be fed back to the network side; Or it is determined by the standard pre-defined way. The standard can specify that the serving cell must report for a certain event or certain events, or make no restrictions, for example, the standard specifies that it must be reported for LTM Y, Y can be any of the above events.

[0543] In all the above schemes, whether the cells reporting L1 measurement results contain beams that meet the event under the corresponding cell can depend on the network side configuration. If the network side configures to report the event beam, it is reported. The above configuration can be for a certain event or for certain events, for example, the network side configures to contain event beams for LTM Y, Y can be any of the above events; It can also be decided by the terminal itself and can be fed back to the network side; Or it is determined by the standard pre-defined way. The standard can specify that the corresponding beam that meets the event must be reported for a certain event or certain events, or make no restrictions, for example, the standard specifies that it must be reported for event Y, Y can be any of the above events.

[0544] In all the above schemes, whether to report the measurement results of the candidate cells that meet the event can depend on the network side configuration. If the network side configures to report, it is reported. The above configuration can be for a certain event or for certain events, for example, the network side configures the candidate cell to report for event Y, Y can be any of the above events; It can also be decided by the terminal itself and can be fed back to the network side; Or it is determined by the standard pre-defined way. The standard can specify that the candidate cell that meets the event must be reported for a certain event or certain events, or make no restrictions, for example, the standard specifies that it must be reported for Event Y, Y can be any of the above events.

[0545] In addition, for all the above schemes, whether the serving cell belongs to the candidate cell can depend on the network side configuration or the standard pre-definition.

[0546] The measurement result of L1 can be at least one of the following information: L1-RSRP or L1-SINR information obtained based on SSB measureme...

Claims

A mobility management method is performed on a user equipment, comprising: receiving configuration information sent by a network side, the configuration information comprising at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, measurement reference resource configuration information of the candidate cell satisfying certain constraints; and measuring a layer one signal to interference noise ratio (L1-SINR) or a layer one reference signal received power (L1-RSRP) of a channel state information reference signal (CSI-RS) of the candidate cell, and sending a L1-SINR or L1-RSRP measurement report of the CSI-RS of the candidate cell to the network side. The mobility management method according to claim 1, wherein The configuration information is a radio resource control (RRC) reconfiguration message sent by the network side. The mobility management method according to claim 1, wherein The candidate cell is configured with a first resource set and a second resource set, the first resource set is used for channel measurement of the candidate cell using a CSI-RS resource, and the second resource set is used for interference measurement of the candidate cell using a channel state information interference measurement (CSI-IM) resource or a non-zero power channel state information reference signal (NZP CSI-RS) resource, wherein each CSI-RS resource is associated to one CSI-IM resource or one NZP CSI-RS resource in order. The mobility management method according to claim 1, wherein Satisfying certain constraints means satisfying at least one of time domain, frequency domain, and resource pattern constraints. The mobility management method according to claim 4, wherein The mode of CSI-IM resource configuration of different candidate cells is the same as the mode of CSI-IM resource configuration of a serving cell. The mobility management method according to claim 4, wherein The number of resource blocks occupied by the frequency domain resources of the CSI-IM resources of different candidate cells is the same as the number of resource blocks occupied by the frequency domain resources of the CSI-IM resources of the serving cell. The mobility management method according to claim 4, wherein The time domain behavior of the CSI-IM and / or CSI-RS resources of different candidate cells and the time domain behavior of the CSI-IM and / or CSI-RS resources of the serving cell are all periodic, semi-persistent, or aperiodic. The mobility management method according to claim 4, wherein Corresponding measurement reference signals (RSs) in the same reporting instance are located within one measurement time window in the time domain. The mobility management method according to claim 8, wherein The measurement time window is L consecutive time slots, and L is configured or predefined. The mobility management method according to claim 9, wherein The value of L is any one of L∈{1,2,3...,40} time slots. The mobility management method according to any one of claims 1 to 10, wherein The mobility management method further comprises that the user equipment performs downlink synchronization with the candidate cell, wherein the measurement of the CSI-RS resources of the candidate cell is based on timing information of the downlink synchronization of the candidate cell. The mobility management method according to claim 11, wherein The coordination between the serving cell and the candidate cell comprises that the serving cell sends a request message to the candidate cell, and the candidate cell replies to the serving cell with a response message after receiving the request message. The mobility management method according to claim 12, wherein The user equipment reports a synchronization completion message to notify the The serving cell and / or the candidate cell activate the downlink of semi-persistent or aperiodic CSI-RS resources, or activate the measurement report of semi-persistent or aperiodic L1-SINR or L1-RSRP. The mobility management method according to claim 11, wherein The activation of semi-persistent or aperiodic CSI-RS resources of the candidate cell is completed by the serving cell, and the user equipment reports semi-persistent or aperiodic CSI based on the CSI-RS resources. The mobility management method according to claim 11, wherein The user equipment performs beam measurement based on the SSB resource configured by the candidate cell, and also performs beam measurement based on the CSI-RS resource configured by the candidate cell. The mobility management method according to claim 15, wherein The SSB resource and the CSI-RS resource satisfy a quasi-co-location (QCL) mapping relationship. The mobility management method according to claim 15, wherein Reporting of the measurement result of the user equipment includes reporting of a measurement result based on the SSB resource and / or reporting of a measurement result based on the CSI-RS resource. The mobility management method according to claim 17, wherein The user equipment performs layer-1 SSB and CSI-RS based measurement result reporting in a first level reporting and a second level reporting manner, the first level reporting includes reporting of a measurement result based on the SSB resource, and the second level reporting includes reporting of a measurement result based on the CSI-RS resource. The mobility management method according to claim 18, wherein Reporting information of the first level reporting includes index information of the candidate cell, layer-1 reference signal received power (L1-RSRP) information obtained by the candidate cell based on SSB measurement, and / or index information (SSBRI) of the SSB resource. The mobility management method according to claim 19, wherein Based on the first level reporting information, the first level reporting information includes measurement information of L candidate cells and / or M beams under each candidate cell, and L and M are any one of {1, 2, 3, 4}. The mobility management method according to claim 18, wherein Reporting information of the second level reporting includes index information of the candidate cell, L1-RSRP information and / or L1-SINR information obtained by the candidate cell based on CSI-RS measurement, and / or index information (CRI) of the CSI-RS resource. The mobility management method according to claim 21, wherein The reporting information of the first level reporting and / or the reporting information of the second level reporting supports periodic, aperiodic, and / or semi-persistent reporting. The mobility management method according to claim 22, wherein The reporting information of the first level reporting and / or the reporting information of the second level reporting is carried on a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH). A mobility management method is performed on a user equipment, including: Receiving configuration information sent by a network side, the configuration information including at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, event-based reporting configuration information, and measurement reference resource configuration information of the candidate cell satisfying certain constraints: Performing layer-1 measurement based on the configuration information to obtain a layer-1 measurement quantity: and Determining whether to perform event-triggered reporting based on a defined triggering event. The mobility management method according to claim 24, wherein The measurement resource of the serving cell and / or the measurement resource of the candidate cell includes a synchronization signal block (SSB) resource and / or a channel state information reference signal (CSI-RS) resource. The mobility management method according to claim 24, wherein The measurement quantity of the L1 includes layer-1 reference signal received power (L1-RSRP) and / or layer-1 signal-to-interference-and-noise ratio (L1-SINR). The mobility management method according to claim 24, wherein Based on a defined triggering event, reporting content of event-triggered reporting is carried in a medium access control control element (MAC CE) or downlink control information (DCI). The mobility management method according to claim 24, wherein The defined trigger event includes event LTM2, event LTM3, event LTM4, event LTM5, event LTMX, and other events, wherein the other events refer to other events triggered by beams of the candidate cell and beams of the serving cell at the same time. The mobility management method according to claim 24, wherein The mechanism of reporting the event trigger is as follows: only reporting the cell and / or beam information of the triggered event; the network side configures the number of reported cells and / or beams, and the terminal further selects based on the number configured by the network side on the basis of the reported beam information of the triggered event; or the terminal selects the reported cell and / or beam measurement information based on the number of reported cells and / or beams configured by the network side. The mobility management method according to claim 24, wherein The reporting quantity includes at least one of the following reporting quantities: event type, candidate cell index, reference resource index, L1-RSRP or L1-SINR obtained by reference resource measurement, and reporting configuration ID information. The mobility management method according to claim 24, wherein If the reporting quantity includes the measurement results of multiple cells, the priority of the reporting quantity of different cells is determined according to the cell index, the event, or the event type. The mobility management method according to claim 24, wherein The combination of the event reporting based on L1 measurement and the CSI reporting based on CSI-RS, wherein the CSI reporting is based on the network side configuration, predefinition, or user equipment selection. A mobility management method is executed on a user equipment, comprising: receiving configuration information sent by the network side, wherein the configuration information includes at least one of the following: ID information of a candidate cell, measurement reporting configuration information of the candidate cell, and measurement reference resource configuration information of the candidate cell satisfying certain constraints: performing CSI measurement and / or reporting of the candidate cell based on the configuration of the reference signal, wherein the CSI information reporting of the candidate cell is located before the handover command, or the CSI information reporting of the candidate cell is located after the handover command, or the CSI measurement and reporting of the candidate cell are located after the handover command. The mobility management method according to claim 33, wherein The certain constraints refer to at least one of the following constraints: time domain, frequency domain, and resource mode. The mobility management method according to claim 33, wherein If the aperiodic channel state information reference signal (CSI-RS) is triggered based on a medium access control (MAC) control element (CE), the starting time of the processing time of the CSI is referenced to the last symbol of the physical downlink shared channel (PDSCH) carrying the MAC CE message. The mobility management method according to claim 35, wherein The MAC CE carrying content includes the handover command, target cell beam indication information, and / or target cell aperiodic or semi-persistent CSI-RS resource activation information. The mobility management method according to claim 33, wherein The user equipment reports the CSI of multiple candidate cells before cell handover based on the priority of the CSI reporting, wherein the priority of the CSI reporting is determined based on at least one of the following: index ID of the candidate cell, RI information of the candidate cell reporting the CSI, wideband CQI information of the candidate cell reporting the CSI, size of L1-RSRP or L1-SINR of the candidate cell reporting the beam measurement result, and reporting overhead of the candidate cell. The mobility management method according to claim 33, wherein The mobility management method further comprises: The user equipment receives a cell switching command and / or a CSI measurement and / or a reporting activation message sent by the network side, wherein the activation message is used to activate the measurement and / or reporting of the CSI. The mobility management method according to claim 33, wherein The reported CSI includes: The user equipment reports the CSI information corresponding to the beam pair under the candidate cell, wherein the reporting of the CSI information corresponding to the beam pair under the candidate cell is based on the beam determination of the L1 measurement reporting, and the user equipment makes further selection on this basis; or the user equipment makes selection based on the configuration information of the network side; or the selection is completely dependent on the user equipment. The mobility management method according to claim 33, wherein The reporting content of the reported CSI includes at least one of event ID, Cell ID, CRI, PMI, RI, and CQI; the reporting mode is one or more reporting instances, and the maximum number of cells and / or the number of CSI corresponding to the CSI-RS resource in each reporting instance is restricted. A mobility management method, executed on the network side, includes: sending configuration information to the user equipment, wherein the configuration information includes at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, and measurement reference resource configuration information of the candidate cell satisfying certain constraints; and requesting the user equipment to measure the layer one signal to interference noise ratio (L1-SINR) or the layer one reference signal received power (L1-RSRP) of the channel state information reference signal (CSI-RS) of the candidate cell, and receiving the L1-SINR or L1-RSRP measurement report of the CSI-RS of the candidate cell sent by the user equipment. The mobility management method according to claim 41, wherein The configuration information is a radio resource control (RRC) reconfiguration message sent by the network side. The mobility management method according to claim 41, wherein The candidate cell is configured with a first resource set and a second resource set, the first resource set is used for channel measurement using CSI-RS resources, and the second resource set is used for interference measurement using channel state information interference measurement (CSI-IM) resources or non-zero power channel state information reference signal (NZP CSI-RS) resources, wherein each CSI-RS resource is associated with one CSI-IM resource or one NZP CSI-RS resource in order. The mobility management method according to claim 41, wherein Satisfying certain constraints means satisfying at least one of time domain, frequency domain, and resource mode constraints. The mobility management method according to claim 44, wherein The mode of CSI-IM resource configuration of different candidate cells is the same as the mode of CSI-IM resource configuration of the serving cell. The mobility management method according to claim 44, wherein The number of resource blocks occupied by the frequency domain resources of the CSI-IM resources of different candidate cells is the same as the number of resource blocks occupied by the frequency domain resources of the CSI-IM resources of the serving cell. The mobility management method according to claim 44, wherein The time domain behavior of the CSI-IM and / or CSI-RS resources of different candidate cells and the time domain behavior of the CSI-IM and / or CSI-RS resources of the serving cell are all periodic, semi-persistent, or aperiodic. The mobility management method according to claim 44, wherein The corresponding measurement reference signals (RSs) in the same reporting instance are located within one measurement time window in the time domain. The mobility management method according to claim 48, wherein The measurement time window is L consecutive time slots, and L is a configured or predefined value. The mobility management method according to claim 49, wherein L is any one of the L∈{1,2,3...,40} slots. The mobility management method according to any one of claims 41 to 50, wherein The mobility management method further comprises: requesting the user equipment to perform downlink synchronization with the candidate cell, wherein the measurement of the CSI-RS resource of the candidate cell is based on timing information of the downlink synchronization of the candidate cell. The mobility management method according to claim 51, wherein The coordination between the serving cell and the candidate cell comprises that the serving cell sends a request message to the candidate cell, and the candidate cell replies to the serving cell with a response message after receiving the request message. The mobility management method according to claim 52, wherein The network measurement receives a synchronization completion message reported by the user equipment, and notifies the serving cell and / or the candidate cell to activate the downlink of the semi-persistent or aperiodic CSI-RS resource, or to activate the semi-persistent or aperiodic L1-SINR or L1-RSRP measurement report. The mobility management method according to claim 51, wherein The activation of the semi-persistent or aperiodic CSI-RS resource of the candidate cell is completed by the serving cell, and the network measurement requests the user equipment to report the semi-persistent or aperiodic CSI based on the CSI-RS resource. The mobility management method according to claim 51, wherein The network measurement requests the user equipment to perform beam measurement based on the SSB resource configured by the candidate cell, and further requests the user equipment to perform beam measurement based on the CSI-RS resource configured by the candidate cell. The mobility management method according to claim 55, wherein The SSB resource and the CSI-RS resource satisfy a quasi-co-location (QCL) mapping relationship. The mobility management method according to claim 55, wherein The network measurement requests the user equipment to report the measurement results, which comprises reporting the measurement results based on the SSB resource and / or reporting the measurement results based on the CSI-RS resource. The mobility management method according to claim 57, wherein The network measurement requests the user equipment to report the layer-one measurement results based on SSB and CSI-RS in a first-level reporting and a second-level reporting manner, the first-level reporting comprises reporting the measurement results based on the SSB resource, and the second-level reporting comprises reporting the measurement results based on the CSI-RS resource. The mobility management method according to claim 58, wherein The reporting information of the first-level reporting comprises index information of the candidate cell, layer-one reference signal receiving power (L1-RSRP) information of the candidate cell obtained based on SSB measurement, and / or index information (SSBRI) of the SSB resource. The mobility management method according to claim 59, wherein Based on the first-level reporting information, the first-level reporting information comprises measurement information of L candidate cells and / or M beams under each candidate cell, and the values of L and M are any one of {1, 2, 3, 4}. The mobility management method according to claim 58, wherein The reporting information of the second-level reporting comprises index information of the candidate cell, L1-RSRP information and / or L1-SINR information of the candidate cell obtained based on CSI-RS measurement, and / or index information (CRI) of the CSI-RS resource. The mobility management method according to claim 61, wherein The reporting information of the first-level reporting and / or the reporting information of the second-level reporting supports periodic, aperiodic, and / or semi-persistent reporting. The reporting information of the first-level reporting and / or the reporting information of the second-level reporting is carried on a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH). The mobility management method according to claim 62, wherein ​ A mobility management method, executed at a network side, comprises: sending configuration information to a user equipment, the configuration information comprising at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, event-based reporting configuration information, and measurement reference resource configuration information of the candidate cell satisfying certain constraints; requesting the user equipment to perform layer one measurement based on the configuration information to obtain a layer one measurement quantity; and requesting the user equipment to determine whether to perform event-triggered reporting based on a defined triggering event. The mobility management method according to claim 64, wherein The measurement resource of the serving cell and / or the measurement resource of the candidate cell comprises a synchronization signal block (SSB) resource and / or a channel state information reference signal (CSI-RS) resource. The mobility management method according to claim 64, wherein The layer one measurement quantity comprises a layer one reference signal received power (L1-RSRP) and / or a layer one signal-to-interference-and-noise ratio (L1-SINR). The mobility management method according to claim 64, wherein The reporting content of the event-triggered reporting based on the defined triggering event is carried in a medium access control (MAC) control element (CE) or downlink control information (DCI). The event-triggered mobility management method according to claim 64, wherein, The defined triggering event comprises event LTM2, event LTM3, event LTM4, event LTM5, event LTMX, and other types of events, wherein the other types of events refer to other types of events triggered based on beams of the candidate cell and beams of the serving cell. The mobility management method according to claim 64, wherein The mechanism of the event-triggered reporting is as follows: only reporting cell and / or beam information of a triggering event; the network side configuring a number of reported cells and / or beams, and the terminal further selecting based on the number of cells and / or beams configured by the network side based on reported beam information of a triggering event; or the terminal selecting reported cell and / or beam measurement information based on the number of reported cells and / or beams configured by the network side. The mobility management method according to claim 64, wherein The reporting quantity comprises at least one of the following reporting quantities: event type, candidate cell index, reference resource index, L1-RSRP or L1-SINR obtained by reference resource measurement, and reporting configuration ID information. The mobility management method according to claim 64, wherein If the reporting quantity comprises measurement results of multiple cells, the priority of reporting quantities of different cells is determined according to cell index, event, or event type. The mobility management method according to claim 66, wherein The event reporting based on L1 measurement and the CSI reporting based on CSI-RS are combined, and the CSI reporting is based on network side configuration determination, predefinition, or user equipment selection. A mobility management method, executed at a network side, comprises: sending configuration information to a user equipment, the configuration information comprising at least one of ID information of a candidate cell, measurement reporting configuration information of the candidate cell, and measurement reference resource configuration information of the candidate cell satisfying certain constraints; requesting the user equipment to perform CSI measurement and / or reporting of the candidate cell based on configuration of a reference signal, wherein CSI information of the candidate cell is reported before a handover command, or the CSI information of the candidate cell is reported after the handover command, or the CSI measurement and reporting of the candidate cell are performed after the handover command. The mobility management method according to claim 73, wherein The certain constraints refer to at least one of time domain, frequency domain, and resource mode constraints. The mobility management method according to claim 73, wherein If the aperiodic channel state information reference signal (CSI-RS) is triggered based on a medium access control control element (MAC CE), a starting time of a processing time of the CSI is referenced to a last symbol of a physical downlink shared channel (PDSCH) carrying the MAC CE message. The mobility management method according to claim 75, wherein The MAC CE carries content including the handover command, target cell beam indication information, and / or target cell aperiodic or semi-persistent CSI-RS resource activation information. The mobility management method according to claim 73, wherein The network side requests the user equipment to report CSI of multiple candidate cells before cell handover based on a priority of CSI reporting, which is determined based on at least one of an index ID of the candidate cell, RI information of CSI reported by the candidate cell, wideband CQI information of CSI reported by the candidate cell, a size of L1-RSRP or L1-SINR of beam measurement results reported by the candidate cell, and reporting overhead of the candidate cell. The mobility management method according to claim 73, wherein The mobility management method further includes: sending a cell handover command and / or a CSI measurement and / or reporting activation message to the user equipment, wherein the activation message is used to activate measurement and / or reporting of CSI. The mobility management method according to claim 73, wherein The reported CSI includes: reporting CSI information corresponding to a beam pair in the candidate cell, wherein the CSI information corresponding to the beam pair in the candidate cell is reported based on L1 measurement and beam determination, and the user equipment makes further selection based thereon; or the user equipment makes selection based on configuration information of the network side; or the selection is completely dependent on the user equipment. The mobility management method according to claim 73, wherein The reported content of the reported CSI includes at least one of event ID, Cell ID, CRI, PMI, RI, and CQI; the reporting manner is one or more reporting instances, and the maximum number of cells and / or the number of CSI corresponding to CSI-RS resources in each reporting instance are constrained. A wireless communication device comprising: A processor and a memory for storing a computer program, the processor being configured to invoke and run the computer program stored in the memory to execute the method according to any one of claims 1 to 80.

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