Report transmission apparatus, report reception apparatus, and communication system

Abstract

Embodiments of the present application provide a report transmission apparatus, a report reception apparatus, and a communication system. The report transmission apparatus comprises: a receiver, configured to receive a cell switch command for layer 1 or layer 2 triggered mobility (LTM); and a processor, configured to measure a channel state information reference signal (CSI-RS) resource before and / or after receiving the cell switch command, and transmit a CSI report on the basis of a measurement result.

Description

Report sending device, report receiving device and communication system Technical Field

[0001] The embodiments of this application relate to the field of communication technology. Background Technology

[0002] During the standardization process of Release 18 (Rel-18), the 3GPP standardization organization studied Layer 1 / Layer 2 Triggered Mobility (LTM). For Rel-18 LTM, the goal is to reduce handover interruption through Layer 1 / Layer 2 signaling-based (Layer 1 / Layer 2 triggered) cell handover, thereby enabling faster handover from the serving cell (source cell) to the target cell. The target cell is the cell after the handover, which can be either the serving cell or a non-serving cell. Handover interruption refers to the time from when the terminal device receives the cell switch command (CSC) to when the terminal device successfully completes its first uplink or downlink transmission with the target cell. Compared to traditional Layer 3 signaling-based cell handover, Layer 1 / Layer 2 signaling-based cell handover can further reduce handover interruption.

[0003] In existing networks, terminal devices can measure the current channel based on the Channel State Information (CSI) resource settings and CSI reporting configuration configured on the network device side, and report the channel state information by carrying the uplink control information (UCI) in the uplink channel (such as the Physical Uplink Control Channel PUCCH or the Physical Uplink Shared Channel PUSCH).

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Summary of the Invention

[0005] Rel-18 LTM only supports sending Channel Statement Information Reports (CSI Reports) before cell handover commands. The CSI report includes Layer 1 Reference Signal Receiving Power (L1-RSRP) obtained based on SSB measurements of one or more candidate cells. In other words, the CSI report sent before the cell handover command is used to obtain beam information of the candidate cells, which can be called beam reporting. Therefore, network devices can select candidate cells with better beams for handover to terminal devices.

[0006] In version 19 (Rele-19), LTM further enhances the CSI report, supporting its transmission after a cell handover command. This CSI report includes the CSI obtained based on measurements of the Channel State Information Reference Signal (CSI-RS) of the target cell. Specifically, the CSI report sent after the handover command is used to acquire the target cell's CSI. The CSI includes at least one of the following: Precoding Matrix Indicator (PMI), Channel Quality Indication (CQI), Rank Indication (RI), and CSI-RS Resource Indicator (CRI). This allows network devices to obtain the CSI as quickly as possible after handover, enabling them to select better MIMO transmission schemes and modulation / coding methods for uplink and downlink transmissions, thus facilitating the rapid achievement of high-throughput or high-reliability transmissions after handover.

[0007] To assist base stations in transmitting data more accurately, CSI measurement and reporting are crucial. However, in traditional networks, CSI measurement and reporting configuration is primarily based on the completion of traditional cell handover and / or Radio Resource Control (RRC) configuration, resulting in a significant time delay. Therefore, current CSI measurement and reporting mechanisms do not adequately align with the primary objective of LTM mechanisms—reducing time delay and cell handover interruption time—and consequently, network devices cannot acquire CSI more quickly after a cell handover command.

[0008] Currently, how to conduct and report LTM-based CSI measurements is a problem that needs to be solved.

[0009] To address at least one of the above-mentioned problems, embodiments of this application provide a report sending device, a report receiving device, and a communication system.

[0010] According to another aspect of the embodiments of this application, a report sending apparatus is provided, configured in a terminal device, the apparatus comprising:

[0011] The receiver receives cell handover commands for mobility (LTM) triggered by Layer 1 or Layer 2.

[0012] The processor measures the Channel State Information Reference Signal (CSI-RS) resources before and / or after receiving the cell handover command, and sends a CSI report based on the measurement results.

[0013] According to another aspect of the embodiments of this application, a report sending apparatus is provided, configured in a network device, the apparatus comprising:

[0014] The transmitter sends cell handover commands to the terminal equipment for Layer 1 or Layer 2 triggered mobility (LTM);

[0015] A receiver receives a CSI report sent by the terminal device, wherein the CSI report is obtained by the terminal device measuring the Channel State Information Reference Signal (CSI-RS) resources before and / or after sending the cell handover command.

[0016] According to another aspect of the embodiments of this application, a communication system is provided, the communication system comprising: a network device and a terminal device, the terminal device receiving a cell handover command for Layer 1 or Layer 2 mobility (LTM) triggered by the network device;

[0017] Before and / or after receiving the cell handover command, the terminal device measures the Channel State Information Reference Signal (CSI-RS) resources and sends a CSI report to the network device based on the measurement results.

[0018] One of the beneficial effects of this application embodiment is that, through this application embodiment, when the network side triggers cell handover based on L1 / L2, channel measurement can be performed more quickly and efficiently, and CSI reporting can be performed based on the channel measurement results.

[0019] Specific embodiments of this application are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of this application can be adopted. It should be understood that the embodiments of this application are not limited in scope. Within the spirit and scope of the appended claims, embodiments of this application include many changes, modifications, and equivalents.

[0020] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0021] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components. Attached Figure Description

[0022] The elements and features described in one drawing or embodiment of this application may be combined with elements and features shown in one or more other drawings or embodiments. Furthermore, in the drawings, similar reference numerals denote corresponding parts in several drawings and can be used to indicate corresponding parts used in more than one embodiment.

[0023] Figure 1 is a schematic diagram of a communication system according to an embodiment of this application;

[0024] Figures 2A and 2B are schematic diagrams of LTM scenarios according to embodiments of this application;

[0025] Figures 3A and 3B are schematic diagrams of LTM scenarios according to embodiments of this application;

[0026] Figures 4A and 4B are schematic diagrams of LTM scenarios according to embodiments of this application;

[0027] Figures 5A and 5B are schematic diagrams of LTM scenarios according to embodiments of this application;

[0028] Figure 6 is a schematic diagram of a report sending method according to an embodiment of this application;

[0029] Figure 7 is a schematic diagram of a report receiving method according to an embodiment of this application;

[0030] Figure 8 is a schematic diagram of a report sending device according to an embodiment of this application;

[0031] Figure 9 is a schematic diagram of a report receiving device according to an embodiment of this application;

[0032] Figure 10 is a schematic diagram of a terminal device according to an embodiment of this application;

[0033] Figure 11 is a schematic diagram of a network device according to an embodiment of this application. Detailed Implementation

[0034] Referring to the accompanying drawings, the foregoing and other features of this application will become apparent from the following description. Specific embodiments of this application are specifically disclosed in the description and drawings, illustrating partial implementations in which the principles of this application may be employed. It should be understood that this application is not limited to the described embodiments; rather, it includes all modifications, variations, and equivalents falling within the scope of the appended claims.

[0035] In the embodiments of this application, the terms "first," "second," etc., are used to distinguish different elements by name, but do not indicate the spatial arrangement or chronological order of these elements, and these elements should not be limited by these terms. The term "and / or" includes any one or more of the terms listed in association and all combinations thereof. The terms "comprising," "including," "having," etc., refer to the presence of the stated features, elements, components, or assemblies, but do not exclude the presence or addition of one or more other features, elements, components, or assemblies.

[0036] In the embodiments of this application, the singular forms "a," "the," etc., including the plural forms, should be broadly understood as "a kind" or "a class" rather than limited to the meaning of "an." Furthermore, the term "the" should be understood to include both the singular and plural forms, unless the context explicitly indicates otherwise. Additionally, the term "according to" should be understood as "at least partially based on…," and the term "based on" should be understood as "at least partially based on…," unless the context explicitly indicates otherwise.

[0037] In the embodiments of this application, the term "communication network" or "wireless communication network" may refer to a network that conforms to any of the following communication standards, such as Long Term Evolution (LTE), LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), etc.

[0038] Furthermore, communication between devices in a communication system can be carried out according to communication protocols at any stage, including but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and 5G, New Radio (NR), future 6G, etc., and / or other currently known or future communication protocols.

[0039] In the embodiments of this application, the term "network device" refers, for example, to a device in a communication system that connects a terminal device to a communication network and provides services to that terminal device. Network devices may include, but are not limited to, the following devices: base station (BS), access point (AP), transmission reception point (TRP), broadcast transmitter, mobile management entity (MME), gateway, server, radio network controller (RNC), base station controller (BSC), etc.

[0040] Base stations can include, but are not limited to: NodeBs (or NBs), evolved NodeBs (eNodeBs or eNBs), and 5G base stations (gNBs), IAB hosts, etc. They can also include Remote Radio Heads (RRHs), Remote Radio Units (RRUs), relays, or low-power nodes (e.g., femeto, pico, etc.). The term "base station" can encompass some or all of their functions, and each base station can provide communication coverage to a specific geographic area. The term "cell" can refer to a base station and / or its coverage area, depending on the context in which the term is used.

[0041] In the embodiments of this application, the terms "User Equipment" (UE) or "Terminal Equipment" (TE) refer, for example, to a device that accesses a communication network and receives network services through a network device. A terminal device can be fixed or mobile, and may also be referred to as a mobile station (MS), terminal, subscriber station (SS), access terminal (AT), station, etc.

[0042] The terminal device may include, but is not limited to, the following devices: cellular phone, personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, machine-type communication device, laptop computer, cordless phone, smartphone, smartwatch, digital camera, etc.

[0043] For example, in scenarios such as the Internet of Things (IoT), terminal devices can also be machines or devices for monitoring or measurement, such as including but not limited to: machine-type communication (MTC) terminals, vehicle communication terminals, device-to-device (D2D) terminals, machine-to-machine (M2M) terminals, and so on.

[0044] Furthermore, the terms "network side" or "network equipment side" refer to one side of the network, which can be a base station or include one or more network devices as described above. The terms "user side," "terminal side," or "terminal equipment side" refer to the side of the user or terminal, which can be a UE or include one or more terminal devices as described above. Unless otherwise specified, "equipment" can refer to either network equipment or terminal equipment.

[0045] The following examples illustrate the scenarios of embodiments of this application, but this application is not limited thereto.

[0046] Figure 1 is a schematic diagram of a communication system according to an embodiment of this application, illustrating the case of a terminal device and a network device as examples. As shown in Figure 1, the communication system 100 may include a network device 101 and terminal devices 102 and 103. For simplicity, Figure 1 only illustrates the case of two terminal devices and one network device, but the embodiments of this application are not limited to this.

[0047] In this embodiment of the application, network device 101 and terminal devices 102 and 103 can transmit existing services or services that can be implemented in the future. For example, these services may include, but are not limited to: enhanced mobile broadband (eMBB), massive machine-type communication (mMTC), and ultra-reliable and low-latency communication (URLLC), etc.

[0048] It is worth noting that Figure 1 shows that both terminal devices 102 and 103 are within the coverage area of ​​network device 101, but this application is not limited to this. Both terminal devices 102 and 103 may be outside the coverage area of ​​network device 101, or one terminal device 102 may be within the coverage area of ​​network device 101 while the other terminal device 103 may be outside the coverage area of ​​network device 101.

[0049] In the embodiments of this application, the signaling may be, for example, Radio Resource Control (RRC) signaling; for example, referred to as an RRC message, including MIB, system information, dedicated RRC messages; or referred to as an RRC information element. The signaling may also be, for example, Medium Access Control (MAC) signaling; or referred to as a MAC control element. However, this application is not limited to these.

[0050] In the following description, without confusion, the terms "PDCCH" and "Physical Downlink Control Channel" or "Downlink Control Information" are used interchangeably, as are the terms "PDSCH" and "Physical Downlink Data Channel" or "Downlink Data". Furthermore, transmitting or receiving a PDCCH can be understood as transmitting or receiving downlink control information carried by the PDCCH; transmitting or receiving a PDSCH can be understood as transmitting or receiving downlink data carried by the PDSCH.

[0051] The terms "PUCCH" and "Physical Uplink Control Channel" or "Uplink Control Information" are interchangeable, as are the terms "PUSCH" and "Physical Uplink Data Channel" or "Uplink Data." Furthermore, transmitting or receiving a PUCCH can be understood as transmitting or receiving downlink control information carried by the PUCCH; transmitting or receiving a PUSCH can be understood as transmitting or receiving downlink data carried by the PUSCH.

[0052] For ease of understanding, the following further explains LTM.

[0053] For Rel-18 LTM, the terminal device performs measurements based on SSB or CSI-RS, which enables downlink synchronization with candidate cells (including the target cell) to a certain extent. The terminal device can be triggered by a Physical Downlink Control Channel (PDCCH) order sent by the serving cell to send a Physical Random Access Channel (PRACH) to the candidate cell, thereby achieving uplink synchronization with the candidate cell. The serving cell instructs the terminal device, via a cell handover command (e.g., carried by the Media Access Control (MAC) Control Unit (CE)), to select which candidate cell to hand over to (the indicated candidate cell becomes the target cell), and indicates the beam used for uplink and downlink transmission on the target cell after the handover. For example, the beam refers to the transmission configuration indication state (TCI state). In LTM, the serving cell, candidate cell, and target cell all support a unified TCI state; therefore, the aforementioned indicated TCI state is a unified TCI state. The terminal device receives the cell handover command, which indicates the target cell and the TCI state applied on the target cell. Before receiving the cell handover command, the terminal device has already synchronized with the target cell. After handover to the target cell, it can perform uplink and downlink transmissions with the target cell according to the indicated TCI state. The source reference signal included in the TCI state IE can be either SSB or TRS.

[0054] A unified TCI state can be a joint TCI state or a separate TCI state. A joint TCI state is both a downlink TCI state and an uplink TCI state; a separate TCI state is either a downlink TCI state or an uplink TCI state. The serving cell can activate the candidate cell's TCI state for the terminal device before the cell handover command, and then indicate one (or a pair) of activated TCI states in the cell handover command; alternatively, the serving cell can also indicate one (or a pair) of inactive TCI states in the cell handover command, which is equivalent to the cell handover command directly indicating and activating the TCI state.

[0055] In LTM, the cell that a terminal device may hand over to is called a candidate cell, and the cell that the terminal device actually hands over to is called the target cell. A candidate cell can be a serving cell or a non-serving cell. The terminal device can be provided with candidate cell configuration, receive a cell switch command and a TCI state indication, hand over to the target cell, and apply the indicated TCI state on the target cell.

[0056] For ease of understanding, the existing CSI feedback mechanism will be further explained below.

[0057] In mobile communication systems, terminal devices typically perform CSI measurements according to the instructions and configurations of network devices, and then report the measured CSI to the network devices. When scheduling the terminal device, the network devices can refer to the CSI to schedule the terminal device to transmit using appropriate transmission methods on suitable physical resources. Different terminal devices may experience different physical channel conditions; using a CSI feedback mechanism can make reasonable and effective use of physical resources, thereby improving the overall network transmission efficiency.

[0058] In the CSI feedback mechanism, the terminal device mainly measures and reports reference signals based on the CSI configuration. The reference signals include CSI-RS and SSB, etc. The CSI configuration is mainly divided into two parts: first, the network device configures the reference resources for CSI measurement for the terminal device (CSI-RS resource configuration); second, the network device configures how the terminal device reports (CSI reporting configuration).

[0059] CSI-RS resource settings can be used for interference measurements and CSI channel measurements. Each resource setting contains S resource sets, and each resource set contains Ks CSI-RS resources. A non-periodic resource setting can contain one or more resource sets. For periodic and semi-persistent resource settings, only one resource set can be included when used for CSI acquisition.

[0060] In the CSI reporting framework, CSI reports (used for reporting) are associated with CSI resources (used for measurement). CSI reports can be configured into three types: Periodic CSI reports (P-CSI): transmitted only on the Physical Uplink Control Channel (PUCCH); Semi-persistent CSI reports (SP-CSI): transmitted on either the PUCCH or the Physical Uplink Shared Channel (PUSCH); and Aperiodic CSI reports (AP-CSI): transmitted only on the PUSCH.

[0061] Periodic CSI reports can only be associated with periodic CSI-RS, semi-persistent CSI reports can be associated with both periodic and semi-persistent CSI-RS, and aperiodic CSI reports can be associated with periodic, semi-persistent, and aperiodic CSI-RS.

[0062] P (Period): The feedback period and time slot offset of periodic CSI feedback are configured by RRC. Periodic CSI reporting can only use periodic CSI-RS for channel measurements and periodic CSI-IM (CSI Interference Measurement) for interference measurements. It does not support interference measurements using NZP CSI-RS (Non-Zero Power Channel State Information-Reference Signal). During CSI acquisition, each periodic CSI reporting setting is associated with only one CSI-RS resource set in its associated resource setting. The QCL (quasi-co-location) information for each CSI-RS resource is determined by the TCI state of this resource setting.

[0063] SP (Semi-Persistent): SP-CSI feedback can use periodic CSI-RS or semi-persistent CSI-RS (SP-CSI-RS) for channel measurements, and correspondingly use periodic CSI-IM or semi-persistent CSI-IM (SP-CSI-IM) for interference measurements. NZP CSI-RS is not supported for interference measurements. SP-CSI can be reported based on either PUSCH or PUCCH. PUSCH-based SP-CSI is more similar to aperiodic CSI reporting, with dynamically allocated feedback resources; while PUCCH-based SP-CSI is more similar to periodic CSI reporting, with semi-static feedback resource indication. Therefore, these two feedback methods employ different activation and deactivation mechanisms.

[0064] PUSCH-based SP-CSI: Activated and deactivated by DCI signaling. Within the CSI feedback framework, RRC configures multiple trigger states, up to 64, with each trigger state corresponding to a CSI reporting setting. A trigger state is activated using the CSI request field in DCI. Multiple PUSCH-based SP-CSI instances can be active simultaneously. During CSI acquisition, each CSI reporting setting's associated resource setting contains only one CSI-RS resource set.

[0065] SP-CSI Activation and Deactivation: To distinguish between non-periodic CSI reporting triggering and SP-CSI reporting activation, the DCI format 0_1 ​​scrambled with SP-CSI C-RNTI (Cell-Radio Network Temporary Identifier) ​​is used to activate and deactivate SP-CSI.

[0066] SP-CSI Feedback Slot Offset: Since PUSCH resources are dynamically allocated, the SP-CSI feedback slot offset is indicated by the DCI. This feedback slot offset represents the number of slots from DCI activation to SP-CSI reporting. When SP-CSI reporting is activated in slot n, and the DCI indicates a slot offset of Y, the first SP-CSI reporting slot is n+Y, the second SP-CSI reporting slot is n+Y+P, and so on. Here, P represents the SP-CSI feedback period. The candidate value for this feedback slot Y is configured in the report setting by RRC signaling.

[0067] Activation and deactivation during BWP (Bandwidth Part) handover: Because PUSCH resources are dynamically allocated, CSI reporting based on PUSCH is deactivated during uplink or downlink BWP handover. When the BWP handover is restored, it needs to be reactivated using DCI signaling.

[0068] PUCCH-based SP-CSI: Activated and deactivated by MAC CE. Within the CSI feedback framework, RRC configures multiple SP CSI report settings, and each report setting is configured with multiple PUCCH resources, with one PUCCH resource configured for each candidate UL BWP. MAC CE activates only one report setting at a time.

[0069] SP-CSI Feedback Slot Offset: PUCCH resources are semi-statically allocated, therefore the SP-CSI feedback period and slot offset are configured by RRC in the report settings. It represents the absolute slot position of the system and is independent of the MAC CE activation time.

[0070] Activation and deactivation during BWP handover: During uplink BWP handover, since the PUCCH resources for each candidate BWP have already been configured by RRC, continuous SP-CSI feedback can be guaranteed. Considering the semi-static allocation of PUCCH resources, during downlink BWP handover, CSI reporting based on PUCCH remains active. When the BWP handover back, there is no need to use new DCI signaling to reactivate it, and reporting can continue.

[0071] AP (Aperiodic): Aperiodic CSI reporting is configured and triggered using MAC CE combined with DCI, and is reported based on PUSCH. RRC configures multiple CSI trigger states. Unlike SP-CSI reporting, each CSI trigger state can correspond to one or more report settings. A report setting is triggered by the CSI request field in DCI. The size of the CSI request field in DCI format 0_1 ​​can be configured from 0 to 6 bits by RRC signaling, thus indicating a maximum of 64 CSI trigger states. When the number of CSI trigger states configured by RRC exceeds 64, MAC CE signaling maps 64 of these CSI trigger states to the CSI request field. Aperiodic CSI reporting can use periodic, semi-persistent, or aperiodic CSI-RS for channel measurement, and correspondingly use periodic, semi-persistent, or aperiodic CSI-IM for interference measurement. Only aperiodic NZP CSI-RS can be used for interference measurement.

[0072] Each triggered state can be associated with 1, 2, or 3 resource settings.

[0073] Associated with one resource setting: used for beam management.

[0074] It is associated with two resource settings: one setting for channel measurement and the other setting for interference measurement based on CSI-IM or interference measurement based on NZP CSI-RS.

[0075] It is associated with three resource settings: one setting for channel measurement, one setting for CSI-IM-based interference measurement, and another setting for NZP CSI-RS-based interference measurement.

[0076] If a resource setting contains multiple resource sets, only one resource set is selected. The QCL information for the CSI-RS resources in this resource set is configured for each resource by the TCI state.

[0077] Feedback slot offset for A-CSI (Aperiodic CSI): Similar to SP-CSI, the slot offset reported by Aperiodic CSI is indicated by DCI, and its candidate values ​​are configured in the report setting by RRC signaling. Since each trigger state can correspond to multiple report settings, and different report settings may be configured with different reporting offsets, a unique reporting offset needs to be determined to ensure that all A-CSI reports in the same PUSCH resource. The maximum slot offset among the slot offsets reported by each A-CSI indicated by DCI can be defined as the slot offset corresponding to this trigger state. Assuming a trigger state corresponds to N report settings, if Yi represents the reporting offset of report setting i indicated by DCI, i = 0, 1, ..., N-1, then the reporting offset of A-CSI for this trigger state is determined as follows:

[0078] In the following embodiments, "CSI" can be equivalently replaced with "CSI report", "CSI resource" can be equivalently replaced with "CSI-RS resource", "reporting setting" can be equivalently replaced with "report setting", and "trigger status" can be equivalently replaced with "CSI trigger status". "Report" can be interchanged with "report". "Configuration" and "configuration information" can be interchanged. "Activate or indicate or trigger CSI-RS resource" and "Activate or indicate or trigger CSI report" can be interchanged.

[0079] The following description is based on specific examples.

[0080] First aspect of the embodiments

[0081] This application provides a report sending method, which is described from the perspective of the terminal device.

[0082] Figure 6 is a schematic diagram of a report sending method according to an embodiment of this application. As shown in Figure 6, the method includes:

[0083] 601, The terminal device receives a cell handover command for Layer 1 or Layer 2 triggered mobility (LTM);

[0084] 602. Before and / or after receiving the cell handover command, the terminal device measures the Channel State Information Reference Signal (CSI-RS) resources and sends a CSI report based on the measurement results.

[0085] In some embodiments, a cell handover command for Layer 1 or Layer 2 triggered mobility (LTM) can be carried by a MAC CE, which can indicate the candidate cell for handover and the TCI state applied on that cell. The CSC MAC CE may also include a Timing Advance Command (TAC) field, which the terminal device can use for uplink synchronization.

[0086] For example, a Timing Advance (TA) can be specified, or a capable terminal device can be instructed to obtain the TA based on measurements, thus eliminating the need for the terminal device to perform the RACH procedure after a cell handover command. This is called RACH-less LTM. Additionally, Rel-18 also supports performing the RACH procedure after a cell handover command; this is called RACH-based LTM. If the cell handover command does not specify a valid TA, and the terminal device is not capable of obtaining the TA based on measurements, then the terminal device needs to obtain the TA through the RACH procedure after the cell handover command. This RACH procedure can be Contention-Free Random Access (CFRA), i.e., random access without contention, or Contention-Based Random Access (CBRA).

[0087] In some embodiments, in an LTM scenario, CSI acquisition based on CSI-RS can be specified on a candidate cell before or during cell handover.

[0088] In some embodiments, the terminal device may perform CSI-RS measurement and CSI reporting operations after receiving a Cell Handover Command (CSC) for Layer 1 or Layer 2 Mobility (LTM) triggered. For example, based on the target cell indicated in the CSC, the terminal device may perform CSI-RS measurement for that target cell and send the generated CSI report directly to that target cell.

[0089] In other embodiments, the terminal device can initiate CSI-RS measurements before receiving a Cell Handover Command (CSC) for Layer 1 or Layer 2 Mobility (LTM) triggered. Upon receiving the CSC, the terminal device reports the CSI of the target cell as indicated in the CSC. This further reduces time delays and cell handover interruption time.

[0090] When a terminal device begins CSI-RS measurement before receiving a CSC (Cell Controller Search), since the terminal device is unsure which candidate cell the target cell is after the cell handover, it can configure CSI-RS resources for one or more candidate cells before receiving the CSC and acquire the CSI of those candidate cells based on the configured CSI-RS resources. After receiving the CSC, based on the target cell indicated by the CSC, the terminal device selects the CSI of the candidate cell identified as the target cell from the acquired candidate cell CSIs and reports that CSI.

[0091] The following describes several LTM scenarios involved in the embodiments of this application.

[0092] Figures 2A and 2B are schematic diagrams of Random Access Channel-based LTM (RACH-based LTM). This random access is based on non-contention-based random access (CFRA).

[0093] As shown in Figures 2A and 2B, the terminal device receives a Cell Switch Command (CSC) for LTM. This CSC indicates the resources for CFRA, which may include a random access preamble, etc. The terminal device sends a Physical Random Access Channel (PRACH) to the candidate cell indicated by the CSC (also called the target cell), i.e., it sends a preamble. Then, the terminal device receives a Random Access Response (RAR) by receiving the PDSCH scheduled by Downlink Control Information (DCI). If the terminal device successfully receives the RAR, the random access procedure is considered successfully completed, i.e., the LTM cell switch is successful. A CSI report is then generated.

[0094] For example, as shown in Figure 2A, CSI-RS measurement begins before the CSC is received, and as shown in Figure 2B, CSI-RS measurement begins after the CSC is received.

[0095] [Corrected according to Rule 91, 05.03.2025] Figures 3A and 3B are another schematic diagram of LTM based on random access. In this diagram, the random access is CFRA, and the same content as in Figures 2A and 2B will not be repeated. Unlike Figures 2A and 2B where CSC triggers PRACH transmission, in Figures 3A and 3B, CSC does not indicate the resources of CFRA. In this case, the terminal device can obtain TA through CFRA triggered by a PDCCH order, such as DCI format 1_0, which can indicate the resources of CFRA.

[0096] Figures 4A and 4B are another schematic diagram of LTM based on random access. In this case, the random access is CBRA. As shown in Figures 4A and 4B, the terminal device receives the CSC for LTM, sends PRACH (Msg1), receives RAR (Msg2), sends PUSCH (Msg3) according to the RAR UL grant, and receives Msg4 by receiving the PDSCH scheduled by the DCI. If the terminal device successfully completes the random access procedure, the LTM cell handover procedure is also considered successfully completed. A CSI report is then generated.

[0097] For example, as shown in Figure 4A, CSI-RS measurement begins before the CSC is received, and as shown in Figure 4B, CSI-RS measurement begins after the CSC is received.

[0098] Figures 5A and 5B are schematic diagrams of RACH-less LTM. In these diagrams, the terminal device has already sent a PRACH to the candidate cell before receiving the CSC used for LTM; therefore, no random access procedure is required after receiving the CSC. The terminal device sends a PUSCH following the CSC on the time-frequency resources configured by RRC signaling or scheduled by DCI. This PUSCH can carry an RRC Reconfiguration Complete message.

[0099] For example, as shown in Figure 5A, CSI-RS measurement begins before the CSC is received, and as shown in Figure 5B, CSI-RS measurement begins after the CSC is received.

[0100] In the above embodiments, after CSI-RS measurement, a CSI report is obtained and sent to the network device on the PUSCH. The CSI report includes at least one of the following: Precoding Matrix Indicator (PMI), Channel Quality Indication (CQI), Rank Indication (RI), and CSI-RS Resource Indicator (CRI).

[0101] Through the embodiments of this application, when the network side triggers cell handover based on L1 / L2, channel measurement can be performed more quickly and efficiently, and CSI reporting can be performed based on the channel measurement results.

[0102] In some embodiments, the CSI reporting type includes periodic CSI reporting, semi-persistent CSI reporting, or non-periodic CSI reporting. When the CSI reporting type is semi-persistent or non-periodic CSI reporting, the terminal device performs CSI reporting after a CSI report is triggered (or activated or indicated). The triggering method involves first determining the trigger state, then determining the CSI reporting configuration associated with the trigger state and the CSI-RS resource associated with that configuration. In the following embodiments, activating, indicating, or triggering CSI includes activating CSI-RS and / or CSI reporting.

[0103] For example, when the CSI reporting type is semi-continuous or non-periodic CSI reporting, the CSI report can be associated with the first CSI trigger state in the CSI trigger list configured in the higher-level signaling. For instance, the CSI trigger list includes multiple CSI trigger states, and each CSI trigger state is associated with at least one CSI reporting configuration and / or at least one CSI-RS resource. The terminal device can, by default, perform CSI reporting based on the CSI reporting configuration and / or CSI-RS resource associated with the first CSI trigger state in the CSI trigger list.

[0104] For example, in the case of semi-persistent or aperiodic CSI reporting, the terminal device can also receive first information for activating, indicating, or triggering CSI. This first information can be carried in at least one of the following: a Media Access Control Element (MAC CE) signaling carrying the cell handover instruction, downlink control information (DCI), and a Physical Downlink Shared Channel (PDSCH) carrying a Random Access Response (RAR) uplink grant. In other words, the first information can be sent together with the CSC, for example, by activating, indicating, or triggering CSI reporting via MAC CE signaling carrying the cell handover instruction. Alternatively, the first information can also be sent after the CSC, for example, by activating, indicating, or triggering CSI reporting via CSI request indication information based on the DCI or a PDSCH channel carrying a RAR uplink grant. This first information can be associated with a CSI trigger state in a CSI trigger list configured in higher-layer signaling. In other words, the first information can indicate a CSI trigger state.

[0105] In some embodiments, when the CSI reporting type is semi-persistent or aperiodic CSI reporting, the number of CSI trigger states in the CSI trigger list configured in the higher-layer signaling may not exceed 2^Q, where Q is an integer configured in the higher-layer signaling. Specifically, the value of Q ranges from {0, 1, 2, 3, 4, 5, 6}. This application is not limited to this; Q may also be an integer larger than 6.

[0106] In some embodiments, when the CSI reporting type is semi-persistent or aperiodic CSI reporting, the number of CSI trigger states in the CSI trigger list configured in the higher-layer signaling can exceed 2^Q. In this case, the first information can indicate the selection of the first 2^Q CSI trigger states in the CSI trigger list. In other words, the terminal device can select one CSI trigger state from the first 2^Q CSI trigger states in the CSI trigger list based on the first information.

[0107] In some embodiments, when the CSI reporting type is semi-persistent or aperiodic CSI reporting, the number of CSI trigger states in the CSI trigger list configured in the higher-layer signaling can exceed 2^Q. In this case, a subset of CSI trigger states in the CSI trigger list can be selected and indicated via first information (e.g., MAC CE signaling). In other words, a subset of CSI trigger states in the CSI trigger list can be indicated via MAC CE signaling. This application is not limited to this; the subset can also be indicated via other signaling methods.

[0108] When a subset of CSI trigger states in the CSI trigger list is indicated via MAC CE, the selection indication of the trigger states in the subset can also be made via CSI request indication information in DCI and / or PDSCH channel carrying RAR uplink grant.

[0109] In some embodiments, the MAC CE signaling can be MAC CE signaling carrying cell handover instructions. This application is not limited to this; the MAC CE signaling can also be other signaling.

[0110] In some embodiments, when the CSI reporting type is semi-persistent or non-periodic CSI reporting, and the CSI-RS resource associated with the CSI reporting configuration information is a semi-persistent CSI-RS resource, the CSI-RS resource and CSI can be activated, indicated, or triggered by a single MAC CE signaling. This application is not limited to this; the CSI-RS resource and CSI can also be activated, indicated, or triggered simultaneously by another signaling, or the CSI-RS resource and CSI can be activated, indicated, or triggered separately by two different signaling.

[0111] In some embodiments, the MAC CE signaling can be MAC CE signaling carrying cell handover instructions. This application is not limited to this; the MAC CE signaling can also be other signaling.

[0112] The following example illustrates this.

[0113] Example 1: When the CSI reporting type is semi-persistent or aperiodic CSI reporting, the number of trigger states in the CSI trigger list configured in the higher-layer signaling does not exceed 2^Q, where Q is one of {0, 1, 2, 3, 4, 5, 6}. In this case, CSI and / or CSI trigger states can be activated and / or indicated and / or triggered in the following ways:

[0114] (1) The first information is carried in the Media Access Control (MAC CE) element that carries the cell handover command.

[0115] This can be indicated using existing reserved bits (R) in the CSC signaling. At most, R = Q bits can be used for indication, where Q is one of {0, 1, 2, 3, 4, 5, 6}.

[0116] (2) The first information is the CSI request indication information in DCI.

[0117] Specifically, it is indicated using Q bits.

[0118] (3) The first piece of information is the RAR UL grant (Random Access Response Uplink Grant, PDSCH).

[0119] Specifically, it is indicated using Q bits.

[0120] Example 2: When the CSI reporting type is aperiodic CSI reporting, the number Z of trigger states in the CSI trigger list configured in the higher-layer signaling is greater than 2^Q. In this case, a selection instruction can be added to the MAC CE of the CSC to select trigger states less than or equal to 2^Q. Then, combined with the DCI or RAR UL grant as the first piece of information, a trigger state can be selected from the set of selected trigger states as the active CSI trigger state for the current CSI report.

[0121] Example 3: Alternatively, without the first information indication, the trigger state associated with the CSI can be defaulted to the first CSI trigger state in the CSI trigger list configured in the higher-layer signaling.

[0122] In some embodiments, after the terminal device is configured with a reporting configuration, it can perform channel measurements on CSI-RS based on the reporting configuration and send a CSI report to the network device. When the CSI reporting type is semi-persistent and / or aperiodic CSI reporting, the CSI triggering state can be determined in the aforementioned manner.

[0123] The following explains how to determine the time-domain location for sending semi-continuous and / or aperiodic CSI reports.

[0124] In some embodiments, the time-domain position of sending the CSI report is equal to the first starting position plus the first offset, wherein the first starting position is the time-domain position of receiving the first information, or the time-domain position of the Hybrid Automatic Repeat Request (HARQ) feedback message sent by the terminal device in response to the first information. For example, the time-domain position of receiving the first information may be the last symbol of the information carrying the first information and / or the channel. Alternatively, the time-domain position of receiving the first information may be the first symbol after receiving the information carrying the first information and / or the channel. This application embodiment is not limited thereto. Regarding (1) in the aforementioned Example 1, the first starting position may be the moment when the terminal device receives the MAC CE signaling carrying the CSC, or the moment when the terminal device sends the Hybrid Automatic Repeat Request (HARQ) feedback message after receiving the MAC CE signaling carrying the CSC. The HARQ feedback message may be HARQ-ACK or HARQ-NACK. This application embodiment is not limited thereto. For example, regarding (2) in the aforementioned Example 1, the first starting position may be the moment when the terminal device receives the DCI. Examples will not be provided here.

[0125] Furthermore, the first offset can be carried in the same information or channel as the first information, or it can be carried in different information or channels; this application embodiment does not limit this. For example, the first offset can be carried in MAC CE signaling or DCI carrying CSC.

[0126] In some embodiments, the time-domain location for sending the CSI report is an absolute time-domain location configured by higher-level parameters. Optionally, this higher-level parameter may be included in the CSI reporting configuration information. For example, for Examples 1 to 3 above, the time-domain location for sending the CSI report can all be set to an absolute time-domain location configured by higher-level parameters.

[0127] In some embodiments, the computing power of the terminal device can be indicated by the number of simultaneous CSI calculations (N_CPU), i.e., the number of CSI calculations supported concurrently. If CPU resources are insufficient to support all requested CSI calculations, the terminal device can selectively process CSI reports based on priority. For example, high-priority CSI reports will be processed first, while low-priority reports may not be updated.

[0128] In some embodiments, the terminal device calculates the CSI report in the CSI reporting configuration within a specified window using the central processing unit (CPU) resources described below. The CPU resource usage of the CSI report is explained below.

[0129] In some embodiments, when a terminal device performs CSI-RS measurements based on CSI reporting configuration, each CSI report occupies a certain amount of CPU resources within one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols. When the CSI reporting type is semi-persistent and / or aperiodic CSI reporting, the CSI report occupies CPU resources from the first symbol after receiving the first information until the end of the Physical Uplink Shared Channel (PUSCH) symbol carrying the CSI report; or, the CSI report occupies CPU resources from the first symbol after receiving the cell handover command until the end of the PUSCH symbol carrying the CSI report. That is, the CPU occupancy period (CPU occupancy window) begins at the first symbol after receiving the first information or the first symbol after receiving the cell handover command, and continues until the end of the PUSCH symbol carrying the CSI report. The first symbol after receiving the first information can be the first symbol after receiving a DCI or RAR UL grant or a MAC CE carrying a CSC.

[0130] For example, in Example 1 or 2, the CPU occupancy begins with the first symbol after receiving the first information and continues until the end of the Physical Uplink Shared Channel (PUSCH) symbol carrying the CSI report; in Example 3, the CPU occupancy begins with the first symbol after receiving the cell handover command and continues until the end of the PUSCH symbol carrying the CSI report.

[0131] The following provides further explanation of the CSI reporting configuration for semi-continuous and / or aperiodic CSI reporting.

[0132] In some embodiments, the terminal device receives CSI-RS measurement resources and sends a CSI report after at least a delay of Z. This delay Z ensures that the terminal device has sufficient time to complete the CSI calculation and report it within a specified time. To further reduce the computational complexity and CSI report calculation delay after cell handover, when the CSI reporting type is semi-persistent and / or aperiodic CSI reporting, the CSI reporting configuration associated with the active trigger state needs to meet at least one of the following conditions, or in other words, the terminal device expects the CSI reporting configuration to meet at least one of the following conditions:

[0133] The frequency granularity of the CSI report is wideband (i.e., the subbandSize of reportFreqConfiguration in the reporting configuration is set to wideband);

[0134] The number of physical antenna ports for CSI-RS used for channel measurements shall not exceed 4 (i.e., nrofPorts in the reporting configuration is set to 4);

[0135] The CSI report is generated based on the first type of codebook in a single panel (e.g., the codebooktype in the reporting configuration is set to r19-typeI-SinglePanel and / or r15-typeI-SinglePanel).

[0136] The CSI report does not contain a CSI-RS Resource Indicator (CRI), or the CSI report includes a Channel Quality Indicator (CQI), a Rank Indicator (RI), and a CRI (i.e., the reportQuantity in the reporting configuration is set to 'cri-RI-CQI').

[0137] With the above configuration, CSI calculations are based on the entire bandwidth, rather than subbands, reducing reporting overhead. CSI calculations are based on a maximum of four CSI-RS ports and / or a single-panel codebook from a single resource, further reducing computational complexity. CSI reports do not include CRIs, meaning CSI calculations can be based solely on a single CSI-RS resource without requiring additional indication information, further reducing computational complexity.

[0138] In other words, for LTM-based CSI reports, i.e., the first CSI report received by the terminal device after receiving the CSC, the CSI reporting configuration restrictions on latency Z1 in the standard can be reused. The magnitude of latency Z1 (number of symbols, μ is related to the subcarrier spacing) can be found in Table 1 below:

[0139] In some embodiments, when the configured CSI-RS resource is an aperiodic CSI-RS resource, a corresponding TCI state (beam determination information) can be configured for it in the resource configuration. The terminal device can activate and / or indicate the CSI-RS resource using the methods described in Examples 1 to 3 above. However, after the CSI-RS resource is triggered, the terminal device needs a certain amount of time to identify the corresponding beam. In this embodiment, when the time offset between the time domain location of receiving (or carrying) the first information and the first symbol of the associated aperiodic CSI-RS resource is less than the threshold beamSwitchTiming, the terminal device makes a measurement assumption based on the QCL of the first beam (default beam) to generate the CSI report. The aperiodic CSI-RS resource is a resource in the NZP-CSI-RS-ResourceSet that does not have the higher-layer parameter trs-Info configured. The time domain location of receiving the first information can be the information of receiving DCI or RAR UL grant or MAC CE carrying CSC and / or the last symbol of the channel.

[0140] For example, regarding the first beam: when there are other downlink signals that overlap with the time domain of the aperiodic CSI-RS (or any other DL signal in the same symbol as the aperiodic CSI-RS), the first beam is selected based on the quasi-co-location (QCL) assumption of the other downlink signals, including PDSCH or other aperiodic CSI-RS, periodic CSI-RS, and semi-persistent CSI-RS scheduled with an offset equal to or greater than the corresponding threshold.

[0141] For example, when there are no other downlink signals overlapping with the time domain of the aperiodic CSI-RS (or any other DL signals in the same symbols as the aperiodic CSI-RS), regarding the first beam: when at least one CORESET is configured for receiving a portion of the bandwidth BWP of the aperiodic CSI-RS, the first beam is selected based on the QCL assumption with the lowest ID of the CORESET, i.e., the terminal device applies the ID in the latest time slot of the QCL assumption for the CORESET associated with the monitored search space with the lowest ID, wherein one or more CORESETs are monitored within the active BWP of the serving cell.

[0142] In some embodiments, the threshold beamSwitchTiming is configured by higher-layer signaling and / or determined by the terminal device's capabilities and then reported to the network device. The configurable values ​​for the threshold include at least a specific value configured for LTM. For example, the specific value is smaller than other configurable threshold values. For instance, existing configurable threshold values ​​include (number of symbols): 14, 28, 48, 56, 112, 192, 224, 336, etc., and shorter thresholds, such as 10 or 12, can be configured for LTM; these will not be listed here. Therefore, when performing CSI-RS measurements after CSC, channel measurements can be performed more quickly and efficiently, and CSI reporting can be based on the channel measurement results.

[0143] In some embodiments, when CSI-RS measurements are performed before CSC, the terminal device is configured with CSI-RS resources for all candidate cells by the network device. This means that, even for the same downlink signal, CSI-RS resources may overlap with other downlink signals originating from different cells. Therefore, an additional requirement applies to the first beam: when other downlink signals overlap with the aperiodic CSI-RS in the time domain and are located in the same cell, the first beam is selected based on the quasi-co-location (QCL) assumption of these other downlink signals, which include CSI-RS but not PDSCH, where the identity of the same cell can be determined by the Physical Cell Identifier (PCI). In other words, the terminal device uses the beam of the downlink signal with the same PCI as the CSI-RS resource in the time domain as the first beam; or, when there are no other downlink signals in the time domain overlapping with the aperiodic CSI-RS (or in other words, there are any other DL signals in the same symbols as the aperiodic CSI-RS), and when at least one CORESET is configured for receiving a portion of the bandwidth BWP of the aperiodic CSI-RS, the first beam is selected based on the QCL assumption with the CORESET having the lowest ID, which is configured with a cell identifier in the same cell as the aperiodic CSI-RS. That is, the network device needs to configure the lowest ID CORESET with the same cell identifier as receiving the aperiodic CSI-RS.

[0144] In some embodiments, the terminal performs aperiodic CSI-RS reception based on the CSI reporting configuration and the QCL assumption described above, performs channel measurements on the CSI-RS, and sends a CSI report to the network device.

[0145] It is worth noting that the above figures are merely illustrative of embodiments of this application, and the application is not limited thereto. For example, the execution order between various operations can be appropriately adjusted, and other operations can be added or some operations can be removed. Those skilled in the art can make appropriate modifications based on the above description, and are not limited to the description in the above figures.

[0146] The above embodiments are merely illustrative examples of the embodiments of this application, but this application is not limited thereto, and appropriate modifications can be made based on the above embodiments. For example, the above embodiments can be used alone, or one or more of the above embodiments can be combined. The embodiments of this application are illustrated using two reports as an example, but can be extended to cases with more than two reports, which will not be elaborated further.

[0147] Through the above embodiments, when the network side triggers cell handover based on L1 / L2, channel measurement can be performed more quickly and efficiently, and CSI reporting can be performed based on the channel measurement results.

[0148] Second aspect of the embodiments

[0149] This application provides a report receiving method, described from the perspective of a network device. The embodiments of the second aspect can be combined with the embodiments of the first aspect, and the content identical to that of the embodiments of the first aspect will not be repeated.

[0150] Figure 7 is a schematic diagram of a report sending method according to an embodiment of this application. As shown in Figure 7, the method includes:

[0151] 701. The network device sends a cell handover command to the terminal device for Layer 1 or Layer 2 triggered mobility (LTM);

[0152] 702, The network device receives a CSI report sent by the terminal device, wherein the CSI report is obtained by the terminal device measuring the Channel State Information Reference Signal (CSI-RS) resources before and / or after sending the cell handover command.

[0153] In some embodiments, the network device may also send CSI reporting configuration and resource configuration to the terminal device. For implementation methods of the above configuration, please refer to the embodiments of the first aspect.

[0154] In some embodiments, the network device may also send first information for activating, indicating, or triggering the CSI, the first information carrying at least one of the following: a Media Access Control Element (MAC CE) signaling carrying the cell handover instruction, downlink control information (DCI), and a Physical Downlink Shared Channel (PDSCH) carrying a Random Access Response (RAR) uplink grant. Specific implementations can be found in the embodiments of the first aspect.

[0155] In some embodiments, the time-domain position of receiving the CSI report is equal to a first starting position plus a first offset, wherein the first starting position is the time-domain position of sending the first information, or the time-domain position of the Hybrid Automatic Repeat Request (HARQ) feedback message sent by the terminal device in response to the first information. Alternatively, the time-domain position of receiving the CSI report is the absolute time-domain position configured by higher-layer parameters.

[0156] In some embodiments, the implementation of CPU usage for CSI reports and the selection of the default beam can be referred to the embodiments of the first aspect, and will not be repeated here.

[0157] It is worth noting that the above figures are merely illustrative of embodiments of this application, and the application is not limited thereto. For example, the execution order between various operations can be appropriately adjusted, and other operations can be added or some operations can be removed. Those skilled in the art can make appropriate modifications based on the above description, and are not limited to the description in the above figures.

[0158] The above embodiments are merely illustrative examples of embodiments of this application, but this application is not limited thereto, and appropriate modifications can be made based on the above embodiments. For example, the above embodiments can be used alone, or one or more of the above embodiments can be combined.

[0159] Through the above embodiments, when the network side triggers cell handover based on L1 / L2, channel measurement can be performed more quickly and efficiently, and CSI reporting can be performed based on the channel measurement results.

[0160] Third aspect of the embodiments

[0161] This application provides a report sending device. This device may be, for example, a terminal device, or one or more components or parts configured within a terminal device; details identical to those in the first aspect of the embodiment will not be repeated.

[0162] Figure 8 is a schematic diagram of a report sending apparatus according to an embodiment of this application. As shown in Figure 8, the report sending apparatus 800 includes:

[0163] Receiver 801 receives cell handover commands for mobility (LTM) triggered by Layer 1 or Layer 2.

[0164] The processor 802 measures the Channel State Information Reference Signal (CSI-RS) resources before and / or after receiving the cell handover command, and sends a CSI report based on the measurement results.

[0165] In some embodiments, the CSI report type is a semi-persistent or non-periodic CSI report, and the CSI report is associated with the first CSI trigger state in the CSI trigger list configured in higher-layer signaling;

[0166] And / or,

[0167] The CSI report type is a semi-persistent or non-periodic CSI report, and the receiver 801 also receives first information for activating, indicating or triggering the CSI, the first information carrying at least one of the following: a Media Access Control Element (MAC CE) signaling carrying the cell handover instruction, downlink control information (DCI), and a Physical Downlink Shared Channel (PDSCH) carrying a Random Access Response (RAR) uplink grant.

[0168] In some embodiments, the time-domain position for sending the CSI report is equal to a first starting position plus a first offset, wherein the first starting position is the time-domain position for receiving the first information, or the time-domain position for the Hybrid Automatic Repeat Request (HARQ) feedback message sent by the terminal device in response to the first information. The first information is carried in a Media Access Control (MAC CE) element carrying the cell handover command.

[0169] In some embodiments, the time domain location for sending the CSI report is the absolute time domain location configured by the higher-layer parameters. The receiver 801 is also configured to receive CSI reporting configuration information, wherein the higher-layer parameters are included in the CSI reporting configuration information.

[0170] In some embodiments, when the time offset between the time-domain location where the first information is received and the first symbol of the associated aperiodic CSI-RS resource is less than a threshold beamSwitchTiming, the processor 802 makes measurement assumptions based on the QCL of the first beam to generate the CSI report. The threshold beamSwitchTiming is determined by higher-layer signaling configuration and / or by terminal device capabilities. The configurable values ​​for the threshold include at least a specific value for the LTM configuration. This specific value is less than other configurable threshold values.

[0171] In some embodiments, when other downlink signals that overlap with the aperiodic CSI-RS in the time domain and are located in the same cell exist, the first beam is selected based on the quasi-co-location (QCL) assumption of the other downlink signals, including the CSI-RS; or, when at least one CORESET is configured for receiving a portion of the bandwidth BWP of the aperiodic CSI-RS, the first beam is selected based on the QCL assumption of the CORESET with the lowest ID, the CORESET with the lowest ID being configured with a cell identifier located in the same cell as the aperiodic CSI-RS.

[0172] In some embodiments, the CSI report begins from the first symbol after the first information is received and continues until the physical uplink shared channel (PUSCH) symbol carrying the CSI report ends, thus occupying the CPU; or, the CSI report begins from the first symbol after the cell handover command is received and continues until the PUSCH symbol carrying the CSI report ends, thus occupying the CPU.

[0173] In some embodiments, the frequency granularity of the CSI report is wideband, and / or the number of physical antenna ports of the CSI-RS used for channel measurements does not exceed 4.

[0174] In some embodiments, the CSI report is generated based on a first type codebook of a single panel (r19-typeI-SinglePanel and / or r15-typeI-SinglePanel); and / or, the CSI report does not contain a CSI-RS Resource Indicator (CRI), or the CSI report includes a Channel Quality Indicator (CQI), a Rank Indicator (RI), and a CSI-RS Resource Indicator (CRI).

[0175] In some embodiments, the terminal device may further include a transmitter (not shown) that sends a CSI report generated by the processor to the network device.

[0176] It is worth noting that the above description only covers the components or modules relevant to this application, but this application is not limited thereto. The report sending device may also include other components or modules, and for details regarding these components or modules, please refer to related technologies.

[0177] Furthermore, for simplicity, the above figures only exemplarily illustrate the connection relationships or signal flows between the various components or modules. However, those skilled in the art should understand that various related technologies, such as bus connections, can be employed. The aforementioned components or modules can be implemented using hardware facilities such as processors, memory, transmitters, and receivers; this application does not limit this implementation.

[0178] Through the above embodiments, when the network side triggers cell handover based on L1 / L2, channel measurement can be performed more quickly and efficiently, and CSI reporting can be performed based on the channel measurement results.

[0179] Fourth aspect of the embodiment

[0180] This application provides a report receiving device. This device may be, for example, a network device, or one or more components or parts configured within a network device; details identical to those in the embodiments of the first to third aspects will not be repeated.

[0181] Figure 9 is a schematic diagram of a report receiving device according to an embodiment of this application. As shown in Figure 9, the report receiving device 900 includes:

[0182] Transmitter 901 sends a cell handover command for Layer 1 or Layer 2 triggered mobility (LTM) to the terminal device;

[0183] Receiver 902 receives a CSI report sent by the terminal device, wherein the CSI report is obtained by the terminal device measuring the Channel State Information Reference Signal (CSI-RS) resources before and / or after sending the cell handover command.

[0184] In some embodiments, transmitter 901 may also send CSI reporting configuration and resource configuration to terminal device. For implementation of the above configuration, please refer to the embodiments of the first aspect.

[0185] In some embodiments, transmitter 901 may also transmit first information for activating, indicating, or triggering the CSI, the first information carrying at least one of the following: Media Access Control Element (MAC CE) signaling carrying the cell handover instruction, Downlink Control Information (DCI), and Physical Downlink Shared Channel (PDSCH) carrying the Random Access Response (RAR) uplink grant. Specific implementations may refer to embodiments of the first aspect.

[0186] In some embodiments, the time-domain position of receiving the CSI report is equal to a first starting position plus a first offset, wherein the first starting position is the time-domain position of sending the first information, or the time-domain position of the Hybrid Automatic Repeat Request (HARQ) feedback message sent by the terminal device in response to the first information. Alternatively, the time-domain position of receiving the CSI report is the absolute time-domain position configured by higher-layer parameters.

[0187] In some embodiments, the implementation of CPU usage for CSI reports and the selection of the default beam can be referred to the embodiments of the first aspect, and will not be repeated here.

[0188] It is worth noting that the above description only covers the components or modules relevant to this application, but this application is not limited thereto. The report sending device may also include other components or modules, and for details regarding these components or modules, please refer to related technologies.

[0189] Furthermore, for simplicity, the above figures only exemplarily illustrate the connection relationships or signal flows between the various components or modules. However, those skilled in the art should understand that various related technologies, such as bus connections, can be employed. The aforementioned components or modules can be implemented using hardware facilities such as processors, memory, transmitters, and receivers; this application does not limit this implementation.

[0190] Through the above embodiments, when the network side triggers cell handover based on L1 / L2, channel measurement can be performed more quickly and efficiently, and CSI reporting can be performed based on the channel measurement results.

[0191] Fifth aspect of the embodiment

[0192] This application also provides a communication system, including network equipment and terminal equipment.

[0193] In the embodiments of this application, the terminal device, as the sender of the CSI report, may include the apparatus described in the third aspect embodiment, and is configured to execute the method of the first aspect embodiment. Since the method has been described in detail in the first aspect embodiment, its contents are incorporated herein and will not be repeated.

[0194] In the embodiments of this application, the network device, as the receiving end of the CSI report, may include the apparatus described in the embodiments of the fourth aspect, and be configured to perform the method of the embodiments of the second aspect. Since the method has been described in detail in the embodiments of the first and second aspects, its contents are incorporated herein and will not be repeated.

[0195] In addition, the terminal device and the network device can also perform their respective regular operations, and the network device can also perform operations corresponding to the operations of the terminal device, such as the network device receiving information / signals from the terminal device, and / or the network device sending information / signals to the terminal device, the details of which are omitted here.

[0196] This application also provides a terminal device, which may be a UE, but this application is not limited to this and may also be other terminal devices.

[0197] Figure 10 is a schematic diagram of a terminal device according to an embodiment of this application. As shown in Figure 10, the terminal device 1000 may include a processor 1010 and a memory 1020; the memory 1020 stores data and programs and is coupled to the processor 1010. It is worth noting that this figure is exemplary; other types of structures may also be used to supplement or replace this structure to achieve telecommunications functions or other functions.

[0198] In some embodiments, the functionality of the apparatus of the third aspect embodiment can be integrated into the processor 1010, wherein the processor 1010 can be configured to execute a program to implement the method as described in the first aspect embodiment, the contents of which are incorporated herein and will not be repeated here.

[0199] In other embodiments, the apparatus of the third aspect embodiment may be configured separately from the processor 1010. For example, the apparatus of the third aspect embodiment may be configured as a chip connected to the processor 1010, and the functions of the apparatus of the third aspect embodiment may be implemented through the control of the processor 1010.

[0200] As shown in Figure 10, the terminal device 1000 may further include: a communication module 1030, an input unit 1040, a display 1050, and a power supply 1060. The functions of these components are similar to those in the prior art and will not be described in detail here. It is worth noting that the terminal device 1000 does not necessarily include all the components shown in Figure 10; these components are not essential. Furthermore, the terminal device 1000 may also include components not shown in Figure 10, which can be referred to in related technologies.

[0201] This application also provides a network device, which may be, for example, a base station, but this application is not limited to this and may also be other network devices.

[0202] Figure 11 is a schematic diagram of the configuration of a network device according to an embodiment of this application. As shown in Figure 11, the network device 1100 may include a processor 1110 and a memory 1120; the memory 1120 is coupled to the processor 1110. The memory 1120 can store various data; in addition, it also stores information processing programs, and executes the programs under the control of the processor 1110.

[0203] In some embodiments, the functionality of the apparatus of the fourth aspect embodiment can be integrated into the processor 1110, wherein the processor 1110 can be configured to execute a program to implement the method of the second aspect embodiment, the contents of which are incorporated herein and will not be repeated here.

[0204] In other embodiments, the apparatus of the fourth aspect embodiment may be configured separately from the processor 1110. For example, the apparatus of the fourth aspect embodiment may be configured as a chip connected to the processor 1110, and the functions of the apparatus of the fourth aspect embodiment may be implemented through the control of the processor 1110.

[0205] In addition, as shown in Figure 11, network device 1100 may also include a transceiver 1130 and an antenna 1140. The functions of these components are similar to those in the prior art and will not be described again here. It is worth noting that network device 1100 does not necessarily need to include all the components shown in Figure 11; furthermore, network device 1100 may also include components not shown in Figure 11, which can be referred to in the prior art.

[0206] This application also provides a computer program, wherein when the program is executed in a terminal device, the program causes the terminal device to perform the method described in the first aspect of the embodiment.

[0207] This application also provides a storage medium storing a computer program, wherein the computer program causes a terminal device to perform the method described in the first aspect of the embodiment.

[0208] This application also provides a computer program product, which includes at least a computer program that, when executed by a processor, causes a terminal device to perform the method described in the first aspect of the embodiment.

[0209] This application also provides a computer program, wherein when the program is executed in a network device, the program causes the network device to perform the method described in the second aspect of the embodiment.

[0210] This application also provides a storage medium storing a computer program, wherein the computer program causes a network device to perform the method described in the second aspect of the embodiment.

[0211] This application also provides a computer program product, which includes at least a computer program that, when executed by a processor, causes a network device to perform the method described in the second aspect of the embodiments.

[0212] The apparatus and methods described above in this application can be implemented in hardware or in combination with software. This application relates to a computer-readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to implement the various methods or steps described above. This application also relates to storage media for storing the above programs, such as hard disks, magnetic disks, optical disks, DVDs, flash memory, etc.

[0213] The methods / apparatus described in conjunction with the embodiments of this application can be directly embodied in hardware, software modules executed by a processor, or a combination of both. For example, one or more and / or combinations of one or more functional block diagrams shown in the figures can correspond to various software modules in a computer program flow, or to various hardware modules. These software modules can correspond to the various steps shown in the figures, respectively. These hardware modules can be implemented, for example, using a field-programmable gate array (FPGA) to embed these software modules.

[0214] The software module can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. A storage medium can be coupled to the processor, enabling the processor to read information from and write information to the storage medium; or the storage medium can be an integral part of the processor. The processor and storage medium can reside in an ASIC. The software module can be stored in the memory of a mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if the device (such as a mobile terminal) uses a high-capacity MEGA-SIM card or a high-capacity flash memory device, the software module can be stored in the MEGA-SIM card or the high-capacity flash memory device.

[0215] One or more and / or one or more combinations of functional blocks described in the accompanying drawings can be implemented as a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof for performing the functions described herein. One or more and / or one or more combinations of functional blocks described in the accompanying drawings can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.

[0216] The present application has been described above with reference to specific embodiments. However, those skilled in the art should understand that these descriptions are exemplary and not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on its spirit and principles, and these modifications and variations are also within the scope of the present application.

[0217] The following notes are also included in relation to this application:

[0218] 1. A report sending method, applied to a terminal device, the method comprising:

[0219] The terminal device receives a cell handover command for mobility (LTM) triggered by Layer 1 or Layer 2.

[0220] Before and / or after receiving the cell handover command, the terminal device measures the Channel State Information Reference Signal (CSI-RS) resources and sends a CSI report based on the measurement results.

[0221] 2. A report receiving method, applied to a network device, the method comprising:

[0222] The network device sends a cell handover command for Layer 1 or Layer 2 triggered mobility (LTM) to the terminal device;

[0223] The network device receives a CSI report sent by the terminal device, wherein the CSI report is obtained by the terminal device measuring the Channel State Information Reference Signal (CSI-RS) resources before and / or after sending the cell handover command.

[0224] 3. A terminal device, comprising a memory and a processor, the memory storing a computer program and the processor being configured to execute the computer program to implement the method as described in Appendix 1.

[0225] 4. A network device comprising a memory and a processor, the memory storing a computer program and the processor being configured to execute the computer program to implement the method as described in Appendix 2.

[0226] 5. A computer program product comprising at least a computer program that, when executed by a processor, causes a terminal device to perform the method as described in Appendix 1.

[0227] 6. A computer program product comprising at least a computer program that, when executed by a processor, causes a network device to perform the method as described in Appendix 2.

Claims

1. A report sending device, configured in a terminal device, wherein, The device includes: The receiver receives cell handover commands for mobility (LTM) triggered by Layer 1 or Layer 2. The processor measures the Channel State Information Reference Signal (CSI-RS) resources before and / or after receiving the cell handover command, and sends a CSI report based on the measurement results.

2. The apparatus according to claim 1, wherein, The CSI report type is a semi-continuous or non-periodic CSI report, and the CSI report is associated with the first CSI trigger status in the CSI trigger list configured in the higher-level signaling; And / or, The CSI report type is a semi-persistent or non-periodic CSI report, and the receiver also receives first information for activating, indicating or triggering the CSI, the first information being carried in at least one of the following: a Media Access Control Element (MAC CE) signaling carrying the cell handover instruction, downlink control information (DCI), and a Physical Downlink Shared Channel (PDSCH) carrying a Random Access Response (RAR) uplink grant.

3. The apparatus according to claim 2, wherein, The time-domain position for sending the CSI report is equal to the first starting position plus the first offset, wherein the first starting position is the time-domain position for receiving the first information, or the time-domain position for the Hybrid Automatic Repeat Request (HARQ) feedback message sent by the terminal device in response to the first information.

4. The apparatus according to claim 3, wherein, The first information is carried in a Media Access Control (MAC CE) element that carries the cell handover command.

5. The apparatus according to claim 2, wherein, The time domain location for sending the CSI report is the absolute time domain location configured by the higher-level parameters.

6. The apparatus according to claim 5, wherein, The receiver is also used to receive CSI reported configuration information, and the higher-level parameters are included in the CSI reported configuration information.

7. The apparatus according to claim 2, wherein, When the time offset between the time-domain location of receiving the first information and the first symbol of the associated aperiodic CSI-RS resource is less than the threshold beamSwitchTiming, the processor makes measurement assumptions based on the QCL of the first beam to generate the CSI report.

8. The apparatus according to claim 7, wherein, The threshold beamSwitchTiming is determined by higher-layer signaling configuration and / or by the capabilities of the terminal device.

9. The apparatus according to claim 7, wherein, The configurable values ​​for the threshold include at least specific values ​​for the LTM configuration.

10. The apparatus according to claim 9, wherein, The specific value is less than other configurable threshold values.

11. The apparatus according to claim 7, wherein, When other downlink signals that overlap with the aperiodic CSI-RS in the time domain and are located in the same cell exist, the first beam is selected based on the quasi-co-location (QCL) assumption of the other downlink signals, including CSI-RS; or, When at least one CORESET is configured for receiving a portion of the bandwidth BWP of the aperiodic CSI-RS, the first beam is selected based on the QCL assumption with the lowest ID of the CORESET, which is configured with a cell identifier that is in the same cell as the aperiodic CSI-RS.

12. The apparatus according to claim 2, wherein, The CSI report begins from the first symbol after receiving the first information and continues until the physical uplink shared channel (PUSCH) symbol carrying the CSI report ends, occupying the CPU; or, the CSI report begins from the first symbol after receiving the cell handover command and continues until the PUSCH symbol carrying the CSI report ends, occupying the CPU.

13. The apparatus according to claim 1, wherein, The frequency granularity of the CSI report is wideband, and / or the number of physical antenna ports of the CSI-RS used for channel measurements does not exceed 4.

14. The apparatus according to claim 1, wherein, The CSI report is generated based on a single-panel first-type codebook (r19-typeI-SinglePanel and / or r15-typeI-SinglePanel). And / or, the CSI report does not contain a CSI-RS Resource Indicator (CRI). Alternatively, the CSI report may include a Channel Quality Indicator (CQI), a Rank Indicator (RI), and a CSI-RS Resource Indicator (CRI).

15. A report receiving device, configured in a network device, wherein, The device includes: The transmitter sends cell handover commands to the terminal equipment for Layer 1 or Layer 2 triggered mobility (LTM); A receiver receives a CSI report sent by the terminal device, wherein the CSI report is obtained by the terminal device measuring the Channel State Information Reference Signal (CSI-RS) resources before and / or after sending the cell handover command.

16. The apparatus according to claim 15, wherein, The transmitter is also configured to transmit first information for activating, indicating, or triggering the CSI, the first information being carried in at least one of the following: a Media Intervention Control Element (MAC CE) signaling carrying the cell handover instruction, downlink control information (DCI), and a Physical Downlink Shared Channel (PDSCH) carrying a Random Access Response (RAR) uplink grant.

17. The apparatus according to claim 15, wherein, The time-domain position of receiving the CSI report is equal to the first starting position plus the first offset, wherein the first starting position is the time-domain position of sending the first information, or the time-domain position of the Hybrid Automatic Repeat Request (HARQ) feedback message sent by the terminal device in response to the first information.

18. The apparatus according to claim 15, wherein, The time-domain location of the received CSI report is the absolute time-domain location configured by the higher-level parameters.

19. The apparatus according to claim 18, wherein, The transmitter is also used to send CSI reporting configuration information, in which the higher-level parameters are included.

20. A communication system comprising a terminal device and a network device, the terminal device receiving a cell handover command for Layer 1 or Layer 2 mobility (LTM) triggered by the network device; Before and / or after receiving the cell handover command, the terminal device measures the Channel State Information Reference Signal (CSI-RS) resources and sends a CSI report to the network device based on the measurement results.

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