Method for processing channel state information report and user equipment

Abstract

The embodiment of the invention provides a method for processing a channel state information report and user equipment. The method comprises: determining a first CSI according to a first reference signal set, wherein the first reference signal set is determined according to a first configuration transmitted by a network device; transmitting the first CSI to the network device according to the first configuration; determining a second CSI according to the second reference signal set; performing cell handover with the target candidate cell according to the first information transmitted by the network device; transmitting the second CSI to the target candidate cell in response to determining that the second CSI does not include invalid CSI; and in response to determining that the second CSI includes at least one invalid CSI, transmitting the second CSI including at least one channel quality indication (CQI) corresponding to the lowest index to the target candidate cell.

Description

Technical Field

[0001] This invention generally relates to communication mechanisms, and in particular to methods and user equipment (UE) for processing channel status information (CSI) reports. Background Technology

[0002] In fifth-generation (5G) mobile communication systems, user equipment (UE) can perform handover (or cell handover) between multiple cells to maintain service continuity. Compared to Layer 3-based mobility procedures, Layer 1 / Layer 2 Mobility (LTM) offers advantages in reducing handover (or cell handover) latency and downtime, and is therefore considered a promising low-latency mobility solution. However, in existing LTM procedures, Layer 1 (L1) measurements are limited to measurements based on the Synchronization Signal Block (SSB).

[0003] Currently, SSB-based L1 measurement procedures involve the UE receiving and evaluating SSB signals from multiple cells and reporting a subset of SSB Resource Indicators (SSBRIs) based on signal strength indices such as Reference Signal Received Power (RSRP). While this provides basic channel quality information, it remains insufficient for accurate and timely channel estimation immediately after cell handover. Consequently, downlink modulation and resource allocation may not be optimally adjusted, leading to a degradation in User Perceived Throughput (UPT).

[0004] Furthermore, existing systems do not incorporate CSI-RS (Channel State Information Reference Signal) measurements into the L1 procedure of LTM, which limits the ability of next-generation base stations to obtain accurate CSI immediately after cell handover. This limitation negatively impacts link adaptation and beam management performance, particularly in scenarios involving high mobility or densely deployed multi-cell environments.

[0005] See Figure 1 The diagram illustrates the effect of CSI feedback. Figure 1 In this case, assume that the UE performs a cell handover operation from the source cell to the target cell at time point T01.

[0006] like Figure 1As shown, if the CSI feedback information associated with the target cell (e.g., CQI (channel quality indicator, CQI), precoding matrix indicator (PMI), CSI-RS resource indicator (CRI), layer indicator (LI), rank indicator (RI), etc.) is unavailable before the cell handover operation, the UE's user perceived throughput (UPT) will experience a significant degradation (e.g., approximately 75%) for a period of time after the cell handover operation.

[0007] On the other hand, if the CSI feedback associated with the target cell is available before the cell handover operation, the UE's UPT will not experience the same degradation after the cell handover operation.

[0008] Therefore, a technical solution is needed to incorporate CSI-RS measurements and reports into the LTM procedure, thereby improving channel state estimation after cell handover and enhancing overall system throughput and user experience. Summary of the Invention

[0009] Therefore, the present invention relates to a method and UE for processing CSI reports, which can be used to solve the above-mentioned technical problems.

[0010] This invention provides a method for processing CSI reports used by a UE, the method comprising: determining a first CSI based on a first set of reference signals, wherein the first set of reference signals is determined according to a first configuration transmitted by a network device; transmitting the first CSI to the network device according to the first configuration; determining a second CSI based on a second set of reference signals; performing a cell handover with a target candidate cell based on first information transmitted by the network device; transmitting the second CSI to the target candidate cell in response to determining that the second CSI does not include invalid CSIs; and transmitting the second CSI including at least one invalid CSI to the target candidate cell in response to determining that the second CSI includes at least one CQI corresponding to the lowest index.

[0011] This invention provides a UE, including a transceiver and a processor. The processor is coupled to the transceiver and configured to perform: determining a first CSI based on a first set of reference signals, wherein the first set of reference signals is determined according to a first configuration transmitted by a network device; controlling the transceiver to transmit the first CSI to the network device according to the first configuration; determining a second CSI based on a second set of reference signals; performing cell handover with a target candidate cell based on first information transmitted by the network device; controlling the transceiver to transmit the second CSI to the target candidate cell in response to determining that the second CSI does not include invalid CSI; and controlling the transceiver to transmit the second CSI including at least one invalid CSI to the target candidate cell in response to determining that the second CSI includes at least one CQI corresponding to the lowest index to the target candidate cell. Attached Figure Description

[0012] The accompanying drawings are included to further illustrate the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0013] Figure 1 A diagram illustrating the effect of applying CSI feedback;

[0014] Figure 2 A UE functional block diagram is shown according to an embodiment of the present invention;

[0015] Figure 3 A flowchart illustrating a method for processing CSI reports according to an embodiment of the present invention is provided.

[0016] Figure 4 A schematic diagram of a communication system according to an embodiment of the present invention is shown;

[0017] Figure 5 A schematic diagram illustrating the selection of a second reference signal set according to option 1 of the present invention is shown;

[0018] Figure 6 A schematic diagram illustrating the selection of a second reference signal set according to option 1 of the present invention is shown;

[0019] Figure 7 A schematic diagram illustrating the selection of a second reference signal set according to option 1' of the present invention is shown;

[0020] Figure 8 A schematic diagram illustrating the selection of a second reference signal set according to option 2 of the present invention is shown;

[0021] Figure 9A A first schematic diagram illustrating the selection of a second set of reference signals according to option 3 of the present invention is shown.

[0022] Figure 9B A second schematic diagram illustrating the selection of a second set of reference signals according to option 3 of the present invention is shown.

[0023] Figure 10A A schematic diagram illustrating the selection of a second set of reference signals according to option 3 of the present invention is shown;

[0024] Figure 10B A schematic diagram illustrating the selection of a second set of reference signals according to option 3 of the present invention is shown;

[0025] Figure 10C A schematic diagram illustrating the selection of a second set of reference signals according to option 3 of the present invention is shown;

[0026] Figure 11 The illustration depicts the application of a threshold according to an embodiment of the present invention. Figure 9A A schematic diagram;

[0027] Figure 12A A schematic diagram illustrating the selection of a second reference signal set according to option 3' of the present invention is shown;

[0028] Figure 12B A schematic diagram illustrating the selection of a second reference signal set according to option 3' of the present invention is shown;

[0029] Figure 13A A schematic diagram illustrating scenario 1 corresponding to option 4 according to the present invention is shown;

[0030] Figure 13B A schematic diagram illustrating scenario 2 corresponding to option 4 according to the present invention is shown;

[0031] Figure 13C A schematic diagram illustrating scenario 3 corresponding to option 4 according to the present invention is shown;

[0032] Figure 14 A schematic diagram illustrating the determination of whether to perform CSI measurement / reporting on a candidate reference signal according to an embodiment of the present invention;

[0033] Figure 15A A schematic diagram illustrating the report configuration corresponding to scenario 2 according to an embodiment of the present invention is shown;

[0034] Figure 15B A schematic diagram illustrating the report configuration corresponding to scenario 2 according to an embodiment of the present invention is shown;

[0035] Figure 16 A schematic diagram illustrating the CSI report configuration according to an embodiment of the present invention is shown.

[0036] Explanation of icon numbers

[0037] 200:UE;

[0038] 202: Transceiver;

[0039] 204: Processor;

[0040] 400: Communication system;

[0041] 1311, 1313, 1321, 1322, 1323, 1324, 1325, 1331, 1332, 1333, 1334, T01: Time point;

[0042] 1411, 1412, 1413, 1414, 1415, 1416, 1417, 1418, 1419: Reference signals;

[0043] S310, S320, S330, S340, S350, S360, S370: Steps. Detailed Implementation

[0044] Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same component reference numerals are used in the drawings and description to denote the same or similar parts.

[0045] See Figure 2 The diagram illustrates a functional block diagram of a UE according to an embodiment of the present invention.

[0046] In this embodiment of the invention, the UE 200 can be implemented as various types of communication devices. These include smartphones, tablets with cellular connectivity, laptops equipped with 5G modems, and fixed wireless access (FWA) devices. Furthermore, the UE can take the form of Internet of Things (IoT) terminals, such as smart meters or industrial sensors, in-vehicle communication units for connected or autonomous vehicles, customer premises equipment (CPE), AR / VR headsets with mobile broadband capabilities, and drones or unmanned aerial vehicles (UAVs) equipped with integrated 5G modules. These devices typically integrate the necessary protocol stack, physical layer components, and radio interfaces to communicate with 5G network infrastructure.

[0047] exist Figure 2In this system, UE 200 includes a transceiver 202 and a processor 204. Transceiver 202 is configured to transmit and receive signals from other devices within its coverage area. Transceiver 202 is capable of performing analog-to-digital signal conversion (ADC), digital-to-analog signal conversion (DAC), modulation, demodulation, signal amplification, low-pass filtering, and band-pass filtering. For example, transceiver 202 is configured to provide received signal information to processor 204, modulate data received from processor 204 into a modulated signal, and transmit the modulated signal to other devices.

[0048] In some embodiments, the UE 200 may also include other components, such as an antenna module for implementing the aforementioned functions of the transceiver 202 and the processor 204.

[0049] Processor 204 may be coupled to transceiver 202. Processor 204 may be, for example, a general-purpose processor, a special-purpose processor, a conventional processor, a digital signal processor (DSP), multiple microprocessors, one or more microprocessors associated with a DSP core, a controller, a microcontroller, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), any other type of integrated circuit (IC), state machine, etc.

[0050] In this embodiment of the invention, the transmission / reception of UE 200 can be performed by the processor 204 of UE 200 controlling the transceiver 202 of UE 200.

[0051] In this embodiment of the invention, processor 204 may be configured to execute the CSI report processing method proposed in this invention, which will be discussed in detail below.

[0052] See Figure 3 The diagram illustrates a flowchart of a CSI report processing method according to an embodiment of the present invention. This embodiment's method can be derived from... Figure 2 Execution in UE 200 Figure 3 Details of each step will be provided below. Figure 2 The components shown are described.

[0053] In step S310, the processor 204 determines the first CSI based on the first reference signal set, wherein the first reference signal set is determined based on the first configuration transmitted by the network device.

[0054] In this invention, the term "network device" can refer to a device capable of communicating with UE 200 and providing wireless access or network control functions. A network device can be a fifth-generation (5G) base station (gNB), a Long Term Evolution (LTE) base station (eNB), or a functional segmentation thereof such as a central unit (CU) and a distributed unit (DU). In other embodiments, a network device may also include entities within the core network, such as Access and Mobility Management Functions (AMF), User Plane Functions (UPF), or other nodes configured to manage UE mobility and resource allocation. Furthermore, a network device may include infrastructure supporting wireless communication, such as small cells, fixed wireless access (FWA) base stations, or satellite communication gateways. Generally, a network device is capable of exchanging control signals and user data with the UE, configuring downlink reference signals, collecting and processing CSI (Current Service Identity), and cooperating with other network nodes to provide stable and efficient communication services, but this invention is not limited thereto.

[0055] In various embodiments, the first reference signal set may include multiple SSBs and / or CSI-RS, but the invention is not limited thereto.

[0056] In some embodiments, the first configuration may be a higher-level configuration included in higher-level signals from network devices, such as radio resource control (RRC) signaling and / or medium access control (MAC) control element (MAC CE), etc.

[0057] In one embodiment, the first CSI may include at least one of a plurality of signal resource indications, RSRP, or at least one differential RSRP.

[0058] In an embodiment, each of the signal resource indicators may include, but is not limited to, the CSI-RS resource indicator and / or the SS / PBCH block resource indicator (SSBRI) associated with the reference signal, but the invention is not limited thereto.

[0059] In one embodiment, RSRP may be the L1-RSRP of the associated reference signal.

[0060] In one embodiment, each differential RSRP may be the difference between the RSRP of the associated reference signal and the RSRP of a specific reference signal in the first set of reference signals.

[0061] In one embodiment, each of the first reference signal set is associated with a candidate cell index.

[0062] In one embodiment, the first CSI includes a first number of distinct signal resource indications for each of the second number of candidate cells, wherein the first number and the second number are configured by higher-layer signaling. In an embodiment, the second number of candidate cells may be the total number of candidate cells, but the invention is not limited thereto.

[0063] To better understand the concept of this invention, Figure 4 This will be used as an example in the following discussion, where Figure 4 A schematic diagram of a communication system according to an embodiment of the present invention is shown.

[0064] exist Figure 4 In the communication system 400, there are UEs currently served by the corresponding serving cell (not shown) and associated candidate cells.

[0065] In embodiments of the present invention, a candidate cell may refer to a cell configured by the network device and considered as a potential target cell for future UE handover (or cell handover). In embodiments of the present invention, a first CSI may be associated with a candidate cell.

[0066] For example, such as Figure 4 As shown, candidate cells can be represented as cell #1 to cell #4, and together with the serving cell, they form the measurement set of UE200.

[0067] The UE 200 can perform SSB or CSI-RS measurements from candidate cells based on the measurement configuration provided by the serving cell or network equipment, and can generate corresponding CSI reports.

[0068] Based on the CSI reported by UE 200, the network device can determine whether to trigger a cell handover between the UE and one of the candidate cells, thereby ensuring an efficient and stable wireless connection during UE movement.

[0069] exist Figure 4 In the candidate cell, each cell has a corresponding SSB that can be transmitted.

[0070] For example, cell #1 can transmit SSB#11 to SSB#13; cell #2 can transmit SSB#21 to SSB#23; cell #3 can transmit SSB#31 to SSB#33; and cell #4 can transmit SSB#41 to SSB#43.

[0071] In this case, SSB#11 to SSB#13 can be considered as associated with the candidate cell index of cell #1; SSB#21 to SSB#23 can be considered as associated with the candidate cell index of cell #2; SSB#31 to SSB#33 can be considered as associated with the candidate cell index of cell #3; and SSB#41 to SSB#43 can be considered as associated with the candidate cell index of cell #4.

[0072] Furthermore, each SSB can be configured with a corresponding CSI-RS having a quasi-co-location (QCL) relationship with it. For example, SSB#31 transmitted by cell #3 can be configured with three CSI-RS (denoted as CSI-RS#311 to CSI-RS#313) having a quasi-co-location relationship with SSB#31, but the invention is not limited thereto.

[0073] Similar to SSB#31, CSI-RS#311 to CSI-RS#313 can also be considered as associated with the candidate cell index of cell #3, but the present invention is not limited thereto.

[0074] exist Figure 4 In this context, processor 204 can determine (e.g., measure) the CSI of each SSB and / or associated CSI-RS.

[0075] In one embodiment, processor 204 can determine (e.g., measure). Figure 4 The SSB resource indication for each SSB is used as the associated CSI. Furthermore, the processor 204 can further determine (e.g., measure) the L1-RSRP of each SSB and thereby determine the associated differential RSRP as the associated CSI.

[0076] For example, processor 204 can be from Figure 4 The RSRP of a specific SSB (e.g., the SSB with the highest RSRP) is subtracted from the RSRP of SSB#31 to obtain the differential RSRP associated with SSB#31. Another example is that processor 204 can obtain... Figure 4 The RSRP of a specific SSB (e.g., the SSB with the highest RSRP) is subtracted from the RSRP of SSB#12 to obtain the differential RSRP associated with SSB#12, but the invention is not limited thereto.

[0077] In another embodiment, processor 204 may determine (e.g., measure). Figure 4 The CSI-RS resource indication for each CSI-RS is used as the associated CSI. Furthermore, the processor 204 can further determine (e.g., measure) the L1-RSRP of each CSI-RS and thereby determine the associated differential RSRP as the associated CSI.

[0078] For example, processor 204 can be from Figure 4 The RSRP of a specific CSI-RS (e.g., the CSI-RS with the highest RSRP) is subtracted from the RSRP of CSI-RS#311 to obtain the differential RSRP associated with CSI-RS#311. Another example is that processor 204 can obtain... Figure 4 The RSRP of a specific CSI-RS (e.g., the CSI-RS with the highest RSRP) is subtracted from the RSRP of CSI-RS#312 to obtain the differential RSRP associated with CSI-RS#312, but the invention is not limited thereto.

[0079] In some embodiments, the first CSI may include a first number of different signal resources indications for each of the second number of candidate cells, wherein the first number and the second number are configured by higher-layer signaling.

[0080] In embodiments where the SSB is considered the first set of reference signals, the first quantity can be represented as M, and the second quantity can be represented as L'. Figure 4 In this scenario, M can be 1, 2, or 3, and L' can be 1, 2, 3, or 4, but the invention is not limited thereto. In this case, the first CSI may include signal resource indications for M SSBs for each of the L' candidate cells.

[0081] In one embodiment, UE 200 can report UE capabilities regarding the maximum values ​​of M and / or L'. The inclusion of the current special cell (SpCell) in the L1 measurement report is configurable. Furthermore, UE capabilities can indicate whether inclusion of the current special cell in the L1 measurement report is supported.

[0082] In embodiments where CSI-RS is considered the first set of reference signals, the first quantity can be represented as M', and the second quantity can be represented as L''. Figure 4 In this scenario, M' can be 1, 2, or 3, and L'' can be 1, 2, 3, or 4, but the invention is not limited thereto. In this case, the first CSI may include signal resource indications for M' CSI-RS for each of the L'' candidate cells.

[0083] In one embodiment, UE 200 may report UE capabilities regarding the maximum value of M' and / or L''. The inclusion of the current special cell in the L1 measurement report is configurable. Furthermore, UE capabilities may indicate whether inclusion of the current special cell in the L1 measurement report is supported.

[0084] Reference Figure 3 In step S320, the processor 204 transmits the first CSI to the network device according to the first configuration.

[0085] In one embodiment, the first CSI may be transmitted in the form of a related report.

[0086] In an embodiment where the first CSI includes signal resource indications for M SSBs for each of the L' candidate cells, the first CSI may be transmitted to the network device in the form of Table 1.

[0087]

[0088] Table 1

[0089] In Table 1, RSRP#1 is the RSRP corresponding to SSBRI#1, and the differential RSRP #i (i is 2, 3, ... or L'xM) is the differential RSRP between RSRP#1 and RSRP#i (for SSBRI#i).

[0090] In addition, the bit widths of SSB resource indication, RSRP, and differential RSRP are shown in Table 2.

[0091]

[0092] Table 2

[0093] In Table 2, KSSB is the number of SSBs configured in the corresponding resource set, Ceil (•) is the floor function, and X and Y are positive integers.

[0094] In embodiments where the first CSI may include signal resource indications for M' CSI-RS for each of the L'' candidate cells, the first CSI may be transmitted to the network device in the form of Table 3.

[0095]

[0096] Table 3

[0097] In Table 3, RSRP#1 is the RSRP corresponding to CRI#1, and differential RSRP#j (j is 2, 3, ... or L''xM') is the differential RSRP between RSRP#1 and RSRP#j (for CRI#j).

[0098] In addition, the bit widths of CSI-RS resource indication, RSRP, and differential RSRP are shown in Table 4.

[0099]

[0100] Table 4

[0101] In Table 4, K CSI-RS This refers to the number of CSI-RS configured in the corresponding resource set.

[0102] In step S330, the processor 204 determines the second CSI based on the second reference signal set.

[0103] In one embodiment, the second CSI may be associated with the target candidate cell.

[0104] In embodiments of the present invention, the second reference signal set may include at least a portion of the first reference signal set.

[0105] In different embodiments, the second set of reference signals may be selected from the first set of reference signals based on different principles, which will be discussed in the following options.

[0106] In option 1, processor 204 may select at least one CSI-RS of each SSB as a second set of reference signals.

[0107] Specifically, for CSI measurements and reporting, reference signals (e.g., CSI-RS) can be selected across multiple configured or initiated candidate cells. For example, if there are L candidate cells, processor 204 can select N CSI-RS for each of the L cells, thus forming a total of K = N × L CSI-RS.

[0108] In this case, at least one CSI corresponding to at least one of the K CSI-RS can be obtained or reported in a single CSI reporting instance.

[0109] In some implementations, the processor 204 may select K CSI-RS from L candidate cells, or for each of the L candidate cells, the processor 204 may select N CSI-RS.

[0110] The value of N can be fixed (e.g., equal to one) or can be configured by network devices (e.g., gNB) via higher-layer signals.

[0111] In some cases, processor 204 may assume that the value of N is equal to or no greater than the number of SSBs (denoted as M), which are configured in another CSI reporting configuration (e.g., an SSB-based L1-RSRP measurement reporting configuration).

[0112] In addition, each of the N CSI-RSs can be configured or has a quasi-co-address relationship with different transmission configuration state (TCI) states or reference signals.

[0113] Similarly, the value of L can also be determined by higher-layer signals. For example, the gNB can indicate a list of candidate cell identities, and the value of L can be equal to the number of cells included in the indicated list. In another case, the processor 204 can assume that the value of L is equal to or not greater than the number of cells (denoted as L') configured in another CSI reporting configuration (e.g., an SSB-based L1-RSRP measurement reporting configuration).

[0114] See Figure 5 The diagram illustrates the selection of a second set of reference signals according to Option 1 of the present invention.

[0115] exist Figure 5 In this configuration, the number of candidate cells L can be four, and the number of CSI-RS selected for each candidate cell can be two (i.e., N is 2). In this case, the processor 204 can select two CSI-RS for each of the four candidate cells (i.e., cell #1 to cell #4), where each CSI-RS has a quasi-co-address relationship with the corresponding SSB.

[0116] For example, for cell #1, two selected CSI-RSs may have quasi-co-located relationships with SSB#11 and SSB#12, respectively. For cell #2, two selected CSI-RSs (e.g., CSI-RS#A1 and CSI-RS#B2) may have quasi-co-located relationships with SSB#21 and SSB#22, respectively. For cell #3, two selected CSI-RSs may have quasi-co-located relationships with SSB#31 and SSB#32, respectively. For cell #4, two selected CSI-RSs may have quasi-co-located relationships with SSB#41 and SSB#42, respectively. In this case, the second reference signal set may include eight selected CSI-RSs.

[0117] In embodiments of the present invention, the second CSI of the second reference signal set may include at least one of a signal resource indicator (SRI), CQI, PMI, or RI, but the present invention is not limited thereto. That is, in Figure 5 In this context, the second CSI of the second reference signal set may include at least one of the SRI, CQI, PMI or RI of each of the eight selected CSI-RS, but the invention is not limited thereto.

[0118] In some implementations, the L1-RSRP of the CSI-RS can be used to select a CSI-RS that has a quasi-co-address relationship with the same SSB.

[0119] Further discussion of option 1 can be found through Figure 6 Provided, among which Figure 6 A schematic diagram illustrating the selection of a second set of reference signals according to Option 1 of the present invention is shown.

[0120] exist Figure 6 In this context, for cell #l (l can be 1, 2, ..., L), processor 204 can select N (N=B×K) CSI-RS from K (e.g., 2) SSBs (e.g., SSB#1 and SSB#2). Processor 204 can select B CSI-RS from each of the K SSBs, where the value of B can be a fixed value or indicated by gNB (e.g., via higher-layer signals). Each of the N CSI-RSs can have a quasi-co-address relationship with one of the K SSBs.

[0121] For example, if B is 2, processor 204 may select 2 CSI-RS from each of the 2 SSBs (e.g., SSB#1 and SSB#2), such as CSI-RS#B and CSI-RS#C which are quasi-co-located with SSB#1 and CSI-RS#D and CSI-RS#E which are quasi-co-located with SSB#2, but the invention is not limited thereto.

[0122] See Figure 7 It illustrates a schematic diagram of option 1' of selecting a second set of reference signals according to the present invention.

[0123] In option 1', processor 204 can perform CSI measurements / reports on different groups of NxL CSI-RS at different time points.

[0124] For example, such as Figure 7 As shown, the processor 204 may first perform CSI measurements / reports on NxL CSI-RS in a first group, and then perform CSI measurements / reports on NxL CSI-RS in a second group. The NxL CSI-RS in the first and second groups may include the same or different CSI-RS, but the invention is not limited thereto.

[0125] In option 2, processor 204 can select at least one CSI-RS for each SSB and select one SSB for each candidate cell.

[0126] Specifically, for CSI measurement and reporting, the selection of a second set of reference signals (e.g., CSI-RS) can be performed across L cells in the configured or initiated cells, where N CSI-RS are selected for each of the L cells. Therefore, a total of K = N × L CSI-RS can be selected, and the CSI corresponding to K CSI-RS can be obtained or reported in a single reporting instance.

[0127] The processor 204 can select K CSI-RS from L cells, or, for each of the L cells, the UE can select N CSI-RS. The value of N can be a fixed value (e.g., equal to 1) or can be configured by the gNB via higher-layer signals.

[0128] Each of the N CSI-RSs can have a quasi-co-address relationship with the same TCI state or reference signal. The TCI state or reference signal can be associated with an SSB. The SSB can be selected or reported in another CSI reporting configuration (e.g., an SSB-based L1 RSRP measurement reporting configuration), such as selecting the SSB with the highest L1 RSRP among the SSBs associated with the same cell identifier.

[0129] The value of L can be indicated by higher-layer signals or determined by gNB indication, for example, by providing a list of cell identifiers, where the value of L equals the number of cells in the list. In some cases, the UE may assume that the value of L is equal to or not greater than the number of cells configured in another CSI reporting configuration (e.g., L'), such as an L1 layer RSRP measurement reporting configuration based on SSB. At least one CSI corresponding to at least one of N × L CSI-RS can be obtained or reported in a single reporting instance.

[0130] See Figure 8 The diagram illustrates a schematic table of selecting a second set of reference signals according to option 2 of the present invention.

[0131] exist Figure 8 In this configuration, when L = 4 and N = 2, processor 204 can select two CSI-RS for each of the four candidate cells (e.g., cells #1 to #4). For cell #1, the two selected CSI-RS may have a quasi-co-location relationship with SSB #12. For cell #2, the two selected CSI-RS (e.g., CSI-RS #B1 and CSI-RS #B2) may have a quasi-co-location relationship with SSB #22. For cell #3, the two selected CSI-RS may have a quasi-co-location relationship with SSB #32. For cell #4, the two selected CSI-RS may have a quasi-co-location relationship with SSB #42. In this case, the second reference signal set may include eight selected CSI-RS.

[0132] In embodiments of the present invention, the second CSI of the second reference signal set may include at least one of SRI, CQI, PMI, or RI, but the present invention is not limited thereto. That is, in Figure 8 In this context, the second CSI of the second reference signal set may include at least one of the SRI, CQI, PMI or RI of each of the eight selected CSI-RS, but the invention is not limited thereto.

[0133] In option 3, processor 204 can select at least one CSI-RS from at least one SSB.

[0134] Specifically, for CSI measurement and reporting, the selection of a second set of reference signals (e.g., CSI-RS) can be performed across L cells from configured or activated cells. For example, processor 204 can select N CSI-RS from one of the L candidate cells. At least one CSI corresponding to at least one of the N CSI-RS can be obtained or reported in a single reporting instance.

[0135] Processor 204 can select N CSI-RS from one of L cells, where the value of N can be a fixed value (e.g., equal to 1) or can be configured by the gNB via higher-layer signals. Each of the N CSI-RS can have a quasi-co-address relationship with the same TCI state or reference signal. The TCI state or reference signal can be associated with an SSB. The SSB can be selected from the set of SSBs configured in the SSB-based L1-RSRP measurement report configuration. The selected SSB can also be reported in another CSI report, for example, as the SSB with the best quality, such as the SSB with the highest RSRP included in that report.

[0136] In some implementations, the quality of the selected SSB (e.g., L1-RSRP) may be required to be higher than a threshold, which may be configured by higher-layer signals or defined as disclosed in another embodiment.

[0137] See Figure 9A The diagram illustrates a first schematic of selecting a second set of reference signals according to option 3 of the present invention.

[0138] exist Figure 9A In this context, when the number of candidate cells L is four and the number of CSI-RS selected for each cell N is two, N CSI-RSs that have a quasi-co-location relationship with the SSB (e.g., SSB#12) can be selected. For example, since the L1-RSRP of SSB#12 is higher than the L1-RSRP of all other SSBs, CSI-RS#A1 and CSI-RS#A2 that have a quasi-co-location relationship with SSB#12 can be selected.

[0139] For example, the L1-RSRP of CSI-RS can be used as a basis for selecting CSI-RS that have a quasi-co-location relationship with the same SSB. Furthermore, the L1-RSRP of CSI-RS can be used to select N CSI-RS from a large set of M CSI-RS, where M > N.

[0140] exist Figure 9A In the context of the second reference signal set, the second CSI may include at least one of SRI, CQI, PMI or RI of each of CSI-RS#A1 and CSI-RS#A2, but the invention is not limited thereto.

[0141] See Figure 9BThe diagram illustrates a second schematic of selecting a second set of reference signals according to option 3 of the present invention.

[0142] exist Figure 9B In this configuration, when the number of cells L is four and the number of CSI-RSs N per cell is two, N CSI-RSs that have quasi-co-location relationships with N SSBs (e.g., SSB#12 and SSB#22) can be selected. Since the L1-RSRP of SSB#12 and SSB#22 is higher than the L1-RSRP of all other SSBs, in this case, processor 204 can select one CSI-RS associated with SSB#12 (e.g., CSI-RS#A1) and another CSI-RS associated with SSB#22 (e.g., CSI-RS#B2). The N SSBs may or may not be restricted to being associated with different cell identifiers.

[0143] For example, the L1-RSRP of CSI-RS can be used as a basis for selecting CSI-RS that have a quasi-co-location relationship with the same SSB. Furthermore, the L1-RSRP of CSI-RS can be used to select N CSI-RS from a large set of M CSI-RS, where M > N.

[0144] exist Figure 9B In the context of the second reference signal set, the second CSI may include at least one of SRI, CQI, PMI or RI of each of CSI-RS#A1 and CSI-RS#A2, but the invention is not limited thereto.

[0145] See Figures 10A to 10C The diagram illustrates different schematic diagrams of selecting a second set of reference signals according to Option 3 of the present invention.

[0146] exist Figures 10A to 10C In this configuration, when the number of cells L is four and the number of CSI-RSs N per cell is two, the processor 204 can select N CSI-RSs that have a quasi-co-location relationship with at least one SSB. The selection of CSI-RSs can be performed based on threshold conditions. For example, the UE can select a CSI-RS only when the L1-RSRP of the associated SSB is higher than a predefined threshold.

[0147] exist Figure 10A Since only the L1-RSRP of SSB#12 and SSB#22 is higher than the predefined threshold (indicated by the dashed line), the processor 204 may select one CSI-RS associated with SSB#12 (e.g., CSI-RS#A1) and another CSI-RS associated with SSB#22 (e.g., CSI-RS#B2) as the second set of reference signals.

[0148] exist Figure 10AIn the context of the second reference signal set, the second CSI may include at least one of SRI, CQI, PMI or RI of each of CSI-RS#A1 and CSI-RS#B2, but the invention is not limited thereto.

[0149] exist Figure 10B Even if the L1-RSRPs of SSB#12, SSB#22, and SSB#32 are all higher than a predefined threshold (indicated by the dashed line), processor 204 may select two (e.g., N) SSBs (e.g., SSB#12 and SSB#22) with the highest L1-RSRP, and accordingly select one CSI-RS with which it has a quasi-co-address relationship. For example, processor 204 may select one CSI-RS associated with SSB#12 (e.g., CSI-RS#A1) and another CSI-RS associated with SSB#22 (e.g., CSI-RS#B2) as the second set of reference signals.

[0150] exist Figure 10B In the context of the second reference signal set, the second CSI may include at least one of SRI, CQI, PMI or RI of each of CSI-RS#A1 and CSI-RS#B2, but the invention is not limited thereto.

[0151] exist Figure 10C In this case, since the L1-RSRP of all SSBs is below a predefined threshold (indicated by the dashed line), the processor 204 may not select any SSB, and therefore the CSI-RS associated with the SSB will not be selected as the second reference signal set, but the invention is not limited thereto.

[0152] See Figure 11 Its illustration applies the concept of a predefined threshold to the present invention. Figure 9A A schematic diagram.

[0153] exist Figure 11 In this case, since only the L1-RSRP of SSB#12 is higher than the predefined threshold (indicated by the dashed line), the processor 204 may select two (e.g., N) CSI-RS (e.g., CSI-RS#A1 and CSI-RS#A2) that have a quasi-co-address relationship with SSB#12 as the second reference signal set.

[0154] exist Figure 11 In the context of the second reference signal set, the second CSI may include at least one of SRI, CQI, PMI or RI of each of CSI-RS#A1 and CSI-RS#A2, but the invention is not limited thereto.

[0155] By applying a threshold, the UE 200 ensures that only CSI-RS associated with a sufficiently strong SSB are selected, thereby improving the reliability of CSI measurements and reporting.

[0156] See Figure 12A and Figure 12B The diagram illustrates a schematic table of selecting a second set of reference signals according to option 3' of the present invention.

[0157] In option 3', for CSI measurement and reporting, the selection of a second set of reference signals (e.g., CSI-RS) can be performed across L cells in the configured or initiated cells. For example, processor 204 can select N CSI-RS from the L candidate cells, where at least one CSI corresponding to at least one of the N CSI-RS can be obtained or reported in a single reporting instance. The value of N can be a fixed value (e.g., equal to 1) or can be configured by the gNB via higher-layer signals.

[0158] The processor 204 can select N CSI-RS from L cells according to various criteria.

[0159] In one embodiment, the processor 204 may select N CSI-RSs with the highest L1-RSRP as a second reference signal set.

[0160] For example, in Figure 12A In this context, assuming N is 4, the processor 204 can select the four CSI-RSs with the highest L1-RSRP (e.g., CSI-RS#112, CSI-RS#121, CSI-RS#122, and CSI-RS#131) as the second set of reference signals.

[0161] exist Figure 12A In the context of the second reference signal set, the second CSI may include at least one of SRI, CQI, PMI or RI of each of CSI-RS#112, CSI-RS#121, CSI-RS#122 and CSI-RS#131, but the present invention is not limited thereto.

[0162] In another embodiment, the selection of the second set of reference signals may be performed based on a threshold, wherein the threshold may be determined based on a value configured in the gNB.

[0163] For example, in Figure 12B In this context, assuming N is 4, the processor 204 can select up to 4 CSI-RSs (e.g., CSI-RS#112, CSI-RS#121, CSI-RS#122, and CSI-RS#131) with L1-RSRP values ​​above a threshold (indicated by the dashed line) as the second set of reference signals.

[0164] exist Figure 12B In the context of the second reference signal set, the second CSI may include at least one of SRI, CQI, PMI or RI of each of CSI-RS#112, CSI-RS#121, CSI-RS#122 and CSI-RS#131, but the present invention is not limited thereto.

[0165] In another scenario, the threshold can be determined based on the quality of a third reference signal. The third reference signal can be selected from a set of reference signals (e.g., the reference signal set of the serving cell), where the selected reference signal may have the highest or lowest quality in the set (e.g., L1-RSRP). The set of reference signals can be configured or selected according to gNB configuration reports, such as L1-RSRP measurement report configuration based on SSB or L1-RSRP measurement report configuration based on CSI-RS.

[0166] In some implementations, the threshold may also be determined based on the highest, lowest, or average quality (e.g., L1-RSRP) of the serving cell reference signal set, where the set is selected or configured according to a gNB configuration report. The same concept can be applied to threshold determination as disclosed in other embodiments.

[0167] In embodiments of the present invention, the second CSI may be associated with a third number of candidate cells and a fourth number of reference signals for each of the third number of candidate cells. In embodiments, the third number may be L, and the fourth number may be N as mentioned in the above embodiments.

[0168] In different embodiments, the CSI measurement and reporting scenario for multiple candidate cells (e.g., CSI measurement and / or reporting of a second CSI) may be implemented as follows.

[0169] In Scenario 1, CSI-RS measurements and CSI reporting operations are performed before receiving the L1 / L2 triggered mobility cell switch command (LTM CSC) transmitted via MAC CE. In this scenario, the CSI report can be transmitted to the serving cell, which then forwards the report to the candidate or target cell.

[0170] In Scenario 2, CSI-RS measurements can be initiated before receiving the L1 / L2 Triggered Mobile Cell Handover Command (LTM CSC) MACCE, while the CSI reporting operation is performed after receiving the L1 / L2 Triggered Mobile Cell Handover Command MAC CE. In this case, the CSI report is transmitted directly to the target cell.

[0171] In Scenario 3, both CSI-RS measurements and CSI reporting operations are performed after receiving the L1 / L2 triggered mobile cell handover command MAC CE. In this case, the CSI report is also transmitted directly to the target cell.

[0172] Note that in this invention, the term "measurement / report" means measurement and / or reporting, and may cover implementations in which measurement and reporting procedures are performed together or separately.

[0173] In option 4, processor 204 may determine a second set of reference signals based on an indication provided by a network device (e.g., gNB). The indication may be transmitted via downlink control information (DCI), MAC CE, and / or RRC signaling, and may include at least one of cell ID, at least one SSB index, and / or at least one CSI-RS resource.

[0174] For example, the network device may determine at least one SSB index of a subset of SSBs based on an L1-RSRP report received from UE 200, wherein the report may include L1-RSRPs corresponding to at least one SSB index. After receiving the indication, the processor 204 may perform a CSI measurement based on the indicated information.

[0175] Since the processor 204 can perform CSI measurements and reports by following any of scenarios 1 to 3, the UE operations associated with the above indications can be performed in different ways.

[0176] See Figure 13A The diagram illustrates a scenario 1 corresponding to option 4 according to the present invention.

[0177] exist Figure 13A In this process, processor 204 can execute steps S310 and S320, enabling the network device to have, for example, L1-RSRP information of SSBs associated with candidate cells. Therefore, the network device can select a first subset of SSBs and carry a first SSB index set of the selected first subset of SSBs in a first indication, and transmit the first indication to UE 200 at time point 1311.

[0178] Therefore, UE 200 may receive a first indication from the network device at time 1311 and perform CSI measurements accordingly on the CSI-RS (e.g., a second set of reference signals) associated with the first SSB index set.

[0179] At time 1312, UE 200 can perform CSI reporting using the physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH), or configured grant PUSCH (CG-PUSCH).

[0180] In addition, the network device may select a second subset of SSBs and carry the second SSB index set of the selected second subset of SSBs in the second indication, and transmit the second indication to UE 200 at time point 1313.

[0181] Therefore, UE 200 can receive a second indication from the network device at time 1313 and perform CSI measurements accordingly on the CSI-RS (e.g., the second reference signal set) associated with the second SSB index set.

[0182] At time 1314, UE 200 can use PUCCH, PUSCH or CG-PUSCH to perform CSI reporting.

[0183] See Figure 13B The diagram illustrates a scenario 2 corresponding to option 4 according to the present invention.

[0184] exist Figure 13B In this process, processor 204 can execute steps S310 and S320, enabling the network device to have, for example, L1-RSRP information of SSBs associated with candidate cells. Accordingly, the network device can select a first subset of SSBs and carry a first SSB index set of the selected first subset of SSBs in a first indication, and transmit the first indication to UE 200 at time point 1321.

[0185] Therefore, UE 200 may receive a first indication from the network device at time 1321 and perform CSI measurements accordingly on the CSI-RS (e.g., a second set of reference signals) associated with the first SSB index set.

[0186] In addition, the network device may select a second subset of SSBs and carry the second SSB index set of the selected second subset of SSBs in the second indication, and transmit the second indication to UE 200 at time point 1323.

[0187] Therefore, UE 200 can receive a second indication from the network device at time 1322 and perform CSI measurements accordingly on the CSI-RS (e.g., the second reference signal set) associated with the second SSB index set.

[0188] exist Figure 13B In the example, assume that UE 200 receives a cell handover command at time 1323, wherein the cell handover command may instruct UE 200 to hand over to a cell that includes at least one of the second SSB index sets.

[0189] At time 1324, the network device may trigger a CSI report for a CSI-RS associated with one of the second SSB index sets. In an embodiment, the network device may use a cell handover command to trigger a CSI report for UE 200, but the invention is not limited thereto.

[0190] At time 1325, UE 200 can use PUCCH, PUSCH, or CG-PUSCH to perform CSI reporting.

[0191] From another perspective, scenario 2 can be viewed as the case where the second CSI is transmitted to the target candidate cell using the first PUSCH after receiving the second information.

[0192] See Figure 13C The diagram illustrates option 4 according to the invention, corresponding to scenario 3.

[0193] exist Figure 13C In this process, processor 204 can execute steps S310 and S320, enabling the network device to have, for example, L1-RSRP information of SSBs associated with candidate cells. Accordingly, the network device can select a subset of SSBs and carry the SSB index set of the selected subset of SSBs in an indication, and transmit the indication to UE 200 at time point 1331.

[0194] exist Figure 13C In the example, assume that UE 200 receives a cell handover command at time 1332, wherein the cell handover command may instruct UE 200 to hand over to a cell that includes at least one of the SSB index sets.

[0195] At time 1333, the network device may trigger a CSI report for a CSI-RS associated with one of the second SSB index sets. In an embodiment, the network device may use a cell handover command to trigger a CSI report for UE 200, but the invention is not limited thereto.

[0196] At time 1334, UE 200 can use PUCCH, PUSCH, or CG-PUSCH to perform CSI reporting.

[0197] Back Figure 3 In step S340, the processor 204 performs cell handover with the target candidate cell based on the first information transmitted by the network device.

[0198] In embodiments of the present invention, the first information may be a cell handover command, which may include at least one of the following: target cell identity, SSB index, and / or CSI-RS resources associated with the target candidate cell. Upon receiving the first information, the processor 204 may control the transceiver 202 of the UE 200 to release the connection with the serving cell and establish a connection with the target candidate cell. By performing cell handover based on conditional handover candidates, the UE can maintain continuous connectivity and minimize downtime during mobility.

[0199] In one embodiment, the second reference signal set can be determined based on second information, which may be, for example... Figures 13A to 13C The instructions mentioned in the document.

[0200] In one embodiment, the first information and the second information can be transmitted by the network device through the same information, which can be regarded as corresponding to Figure 13C This invention is not limited to the above scenarios.

[0201] In one embodiment, the second information is associated with the first CSI, and the second information is associated with at least one of cell identity and signal resource indication. Further details regarding the associations can be found in [reference needed]. Figures 5 to 13C The description will not be repeated here.

[0202] In step S350, the processor 204 determines whether the second CSI includes an invalid CSI.

[0203] In one embodiment, for a selected CSI-RS for CSI measurement and reporting (e.g., identified by a CSI-RS resource indicator), processor 204 may determine whether to calculate the CSI of the CSI-RS based on the reference signal quality and / or an indication provided by the gNB.

[0204] If the reference signal quality (e.g., RSRP value) is above a threshold, and / or if the gNB explicitly indicates that CSI measurement is enabled, the processor 204 may determine the CSI of CSI-RS. Otherwise, the processor 204 may not determine the CSI of CSI-RS.

[0205] The reference signal used for the determination can be the CSI-RS itself or a second reference signal (e.g., SSB) that has a quasi-co-located relationship with the CSI-RS. The threshold used to determine whether CSI should be calculated can be established in various ways. For example, the threshold can be a value directly configured by the gNB. Alternatively, the threshold can be derived from the quality of a third reference signal. The third reference signal can be selected from the serving cell's reference signal set, and the selection can be based on the highest or lowest quality (e.g., RSRP) within the set. The reference signal set can be configured according to gNB configuration reports or selections, such as L1-RSRP measurement report configuration based on SSB or L1-RSRP measurement report configuration based on CSI-RS. In another embodiment, the threshold can be determined based on the highest, lowest, or average quality (e.g., RSRP) of the serving cell's reference signal set, where the set is also configured according to gNB configuration reports or selections.

[0206] In one embodiment, for a CSI report, if the number of CSI-RS selected for the report (e.g., K ≥ 0) is less than the number of CSI-RS configured for the report (e.g., N), the remaining (N – K) CSI-RS can be determined according to the UE implementation. For such remaining CSI-RS, the CQI index can be set to a default value, for example, a CQI index equal to zero. In this case, the CSI corresponding to the CSI-RS can be considered an invalid CSI.

[0207] Therefore, the CQI form can be adjusted to the form of Table 5.

[0208]

[0209] Table 5

[0210] In another embodiment, for CSI reports, if no CSI-RS is available to select for a report, the UE may ignore or discard the CSI report. For example, this may occur when the L1-RSRP of all candidate CSI-RSs is below a threshold, or when there is other uplink control information that collides with the CSI report.

[0211] See Figure 14 The diagram illustrates a schematic table illustrating the determination of whether to perform CSI measurement / reporting on a candidate reference signal according to an embodiment of the present invention.

[0212] exist Figure 14In this context, assume the second set of reference signals includes nine reference signals 1411 to 1419, where only reference signals 1412, 1414, 1415, and 1417 have an L1-RSRP higher than a threshold (indicated by the dashed line). In this case, processor 204 can determine only the second CSI (e.g., PMI, CQI, RI, etc.) of reference signals 1412, 1414, 1415, and 1417 with an L1-RSRP higher than the threshold. That is, processor 204 can determine the second CSI of reference signals 1411, 1413, 1416, 1418, and 1419 (whose L1-RSRP is lower than the threshold) as invalid CSI, and not determine the actual second CSI (e.g., actual PMI, CQI, RI, etc.) of reference signals 1411, 1413, 1416, 1418, and 1419.

[0213] In this case, the processor 204 can determine the second CSI of reference signals 1411, 1413, 1416, 1418, and 1419 as the default value.

[0214] For example, since the CQI of reference signals 1411, 1413, 1416, 1418, and 1419 is not actually determined by processor 204, processor 204 can determine the CQI of reference signals 1411, 1413, 1416, 1418, and 1419 as corresponding CQI index 0, which can be regarded as the CQI corresponding to the lowest index, but the present invention is not limited to this.

[0215] exist Figure 14 In the scenario where the second CSI includes an invalid CSI, the processor 204 may continue to execute step S370 to transmit the second CSI, which includes at least one CQI corresponding to the lowest index, to the target candidate cell.

[0216] In another embodiment, if the second CSI does not include an invalid CSI, the processor 204 may continue to execute step S360 to transmit the second CSI to the target candidate cell.

[0217] For example, if the L1-RSRP of reference signals 1411 to 1419 are all higher than the threshold, the processor 204 can determine the second CSI (i.e., the actual CQI, PMI, RI, etc.) of reference signals 1411 to 1419, and therefore will not determine an invalid second CSI. Accordingly, the second CSI transmitted to the network device will not include any CQI corresponding to the lowest index, which means that the CQI index transmitted in the second CSI will be higher than the lowest index, but the present invention is not limited to this.

[0218] In one embodiment, the CSI corresponding to N × L CSI-RSs can be reported in a single reporting instance. The CSI can be determined based on a rank value, such as rank 1, which can be specified by higher-level configuration (e.g., RI limit) or determined based on the number of antenna ports of the CSI-RS. The CSI may include a set of CSI-RS resource indications, a set of CQIs corresponding to the set of CSI-RS resource indications, and / or a set of RI, PMI, LI, bandwidth indication (also referred to as "i1") or capacity index values ​​corresponding to the set of CSI-RS resource indications.

[0219] In one embodiment, CSI may use either Table 6 or Table 7 below to report.

[0220]

[0221] Table 6

[0222]

[0223] Table 7

[0224] In Tables 6 and 7, CQI#1 is the CQI of CSI-RS Resource Indication #1, and the differential CQI#k (k is 2, 3, ... or L×N) is the differential CQI between CQI#1 and CQI#k.

[0225] In one embodiment, the differential CQI value and the corresponding offset level can be characterized by the following Table 8.

[0226]

[0227] Table 8

[0228] In one embodiment, the CSI corresponding to N CSI-RSs can be reported in a single reporting instance. The CSI can be determined based on a rank value, such as rank 1, which can be specified by higher-level configuration (e.g., RI limit) or determined based on the number of antenna ports of the CSI-RS. The CSI may include a set of CSI-RS resource indications, a set of CQIs corresponding to the set of CSI-RS resource indications, and / or a set of RI, PMI, LI, bandwidth indication, or capacity index values ​​corresponding to the set of CSI-RS resource indications.

[0229] In one embodiment, CSI may use either Table 9 or Table 10 below to report.

[0230]

[0231] Table 9

[0232]

[0233] Table 10

[0234] In Tables 9 and 10, CQI#1 is the CQI of CSI-RS Resource Indication #1, and the differential CQI#m (m is 2, 3, ... or N) is the differential CQI between CQI#1 and CQI#m.

[0235] In one embodiment, the differential CQI value and the corresponding offset level can also be characterized by Table 8 above.

[0236] In another embodiment of a single report instance comprising N CSI-RS, the UE 200 can configure the number of reports (e.g., reportQuantity), which can be characterized by cri-RSRP-CQI, cri-RSRP-RI-CQI, cri-RSRP-RI-PMI-CQI, SSB-index-RSRP-CRI-CQI, SSB-index-RSRP-CRI-RI-CQI, or SSB-index-RSRP-CRI-RI-PMI-CQI.

[0237] In one embodiment, the CSI of an embodiment characterized by the number of reports as cri-RSRP-CQI is illustratively presented in Table 11, and the CSI of an embodiment characterized by the number of reports as SSB-index-RSRP-CRI-CQI is illustratively presented in Table 12.

[0238]

[0239] Table 11

[0240]

[0241] Table 12

[0242] In Table 12, the bit width can be configured by the gNB or by the maximum number of CSI-RS resources that have a quasi-co-located relationship with the SSB.

[0243] In one embodiment, if transmitted along with the L1-RSRP, the L1-RSRP corresponding to the CSI-RS can be replaced by CQI / RI / PMI / i1. For example, if N=1, the CSI of an embodiment characterized by the number of reports in cri-RSRP-CQI can be illustratively presented in Table 13.

[0244]

[0245] Table 13

[0246] In Table 13, RSRP#2 is the RSRP of CSI-RS Resource Indication #2, and Differential RSRP#3 is the differential RSRP between RSRP#2 and RSRP#3 (used for CSI-RS Resource Indication #3).

[0247] In the embodiments of the present invention, Tables 9 to 13 can be understood to correspond to Scenario 1 above, but the present invention is not limited thereto.

[0248] For the CSI reporting configuration in Scenario 2 (e.g., LTM-CSI-ReportConfig) (e.g., CSI-RS measurements can begin before receiving LTM CSC MAC-CE and CSI reporting operations can be performed after receiving LTM CSC MAC-CE), the UE200 can be configured by the network device (e.g., gNB) with time-domain behavior (e.g., indicated by ltm-reportConfigType) indicating reporting types other than 'aperiodic', 'semiPersistentOnPUCCH', 'semiPersistentOnPUSCH', and 'periodic').

[0249] See Figure 15A The diagram illustrates a report configuration corresponding to scenario 2 according to an embodiment of the present invention.

[0250] exist Figure 15A In this case, the report type can be specified as 'none'. UE 200 can determine the CSI for the corresponding CSI-RS resource based on the configured number of reports (e.g., cri-RI-PMI-CQI or cri-RI-CQI) without requiring a CSI report.

[0251] In detail, since the current system specification does not define an operation that only performs CSI measurements but does not perform CSI reports, the report type 'none' can be added to ltm-ReportConfigType to define this operation.

[0252] See Figure 15B The diagram illustrates another schematic of the reporting configuration corresponding to scenario 2 according to an embodiment of the present invention.

[0253] exist Figure 15BIn this configuration, UE 200 can be configured with temporal behavior by a network device (e.g., gNB), for example, indicated by ltm-reportConfigType. ltm-reportConfigType can be set to "aperiodic", "semiPersistentOnPUCCH", "semiPersistentOnPUSCH", or "periodic". For example, when configured as "aperiodic", UE 200 can be further configured with measurement behavior by the gNB, such as measurementConfig, indicating that the UE can perform CSI measurement events when no corresponding CSI report is triggered or initiated.

[0254] For example, UE 200 can be configured with a measurement periodicity (e.g., X milliseconds / slot / subframe). UE 200 can perform at least one CSI measurement on at least one CSI-RS (e.g., in a second set of CSI-RS) within the measurement periodicity.

[0255] From another perspective, Figure 15B This can be considered as a second CSI carried within the CSI report, and the CSI report is configured to be non-periodic.

[0256] In one embodiment, UE 200 may transmit capability information to a network device, such as a gNB. The capability information may indicate whether UE 200 supports long-term CSI measurement and reporting, including, for example, at least one of CQI, RI, and PMI. The capability information may further indicate whether UE 200 supports L1-RSRP measurement and long-term measurement reporting based on CSI-RS.

[0257] Capability information may also include resource limitations and performance constraints for the UE 200. For example, the UE 200 may report the number of CSI processing units (CPUs) available for performing long-term measurement-based CSI measurements and reporting, the maximum number of candidate cells that can support long-term measurement-based CSI measurements and reporting, and the maximum number of CSI-RS per cell or per SSB that can support long-term measurement-based CSI measurements and reporting.

[0258] Furthermore, capability information can indicate whether UE 200 supports CSI reporting based on long-term measurements of the reporting volume associated with at least one of RI, CQI, PMI, LI, and i1. For example, UE 200 can indicate whether it supports CSI reporting based on long-term measurements of the reporting volume associated with half-open-loop CSI, CSI reporting without PMI (e.g., csi-ReportWithoutPMI), or CSI reporting without CQI (e.g., csi-ReportWithoutCQI).

[0259] In various embodiments, the capability information includes at least one of the following: (1) whether the UE supports a first CSI measurement for at least one candidate cell and a first CSI report associated with the first CSI; (2) whether the UE supports a second CSI measurement for at least one candidate cell and a second CSI report associated with the second CSI; (3) whether the second CSI measurement is performed before or after receiving a cell handover command; (4) the maximum number of candidate cells for the first CSI measurement or the second CSI measurement; (5) the maximum number of reference signals for each cell or each SSB for the first CSI measurement or the second CSI measurement; (6) the capability regarding at least one of RI, CQI, PMI and bandwidth indication; or (7) whether the UE supports including the current special cell in the first CSI report.

[0260] See Figure 16 The diagram illustrates a CSI report configuration according to an embodiment of the present invention.

[0261] exist Figure 16 In this configuration, UE 200 may be configured by a higher layer with at least one reporting setting (e.g., LTM-CSI-ReportConfig) and / or at least one resource setting (e.g., LTM-CSI-ResourceConfig). The reporting setting may be associated with a corresponding resource setting used for channel measurements and may include various parameters. For example, the reporting setting may include time-domain behavior (e.g., indicated by ltm-reportConfigType), which may be set to "aperiodic," "semi-persistent on PUCCH," "semi-persistent on PUSCH," or "periodic." For periodic and semi-persistent CSI reporting, the configured periodicity and slot offset are applied to the numeric representation of the uplink bandwidth portion of the transmitted CSI report. The reporting setting may also include the number of cells (e.g., noOfReportedCells) and the number of reference signals per cell (e.g., noOfReportedRSPerCell), as well as an indication of whether UE 200 should include measurement reports associated with the current specific cell (e.g., SpCellInclusion).

[0262] In another embodiment, UE 200 may be configured by a higher layer with at least one resource setting (e.g., LTM-CSI-ResourceConfig). The resource setting may include an SSB resource set (e.g., LTM-CSI-SSB-ResourceSet), which may include a list of Z1 ≥ 1 Synchronization Signal / Physical Broadcast Channel block indices (e.g., LTM-CSI-SSB-ResourceList) and a list of Z1 Physical Cell Identifier indices (e.g., LTM-CandidateId-list), referencing cells associated with the Synchronization Signal / Physical Broadcast Channel block indices. UE 200 may determine the temporal behavior of the Synchronization Signal / Physical Broadcast Channel blocks, such as periodicity and / or position within bursts, from ssb-Periodicity and / or ssb-PositionsInBurst. Frequency domain behavior, such as subcarrier spacing and / or frequency position, may be determined from higher-layer parameters such as subcarrierSpacing and / or ssbFrequency.

[0263] In another embodiment, the resource configuration (e.g., LTM-CSI-ResourceConfig) may include a CSI-RS resource set (e.g., LTM-CSI-NZP-CSI-RS-ResourceSet). This set may include Z2 ≥ 1 CSI-RS index lists (e.g., ltm-CSI-NZP-CSI-RS-ResourceList) and Z2 physical cell identifier index lists (e.g., LTM-CandidateId-list), referencing cells associated with the CSI-RS indexes. UE 200 may determine the TCI state of the CSI-RS resources, where each TCI state includes parameters for configuring a quasi-co-address relationship between one (or two) downlink reference signals and the CSI-RS ports of the CSI-RS resources. The quasi-co-address relationship can be configured using higher-layer parameters, such as qcl-Type1 for the first downlink reference signal and qcl-Type2 for the second downlink reference signal. When configuring two downlink reference signals, the quasi-co-address types should not be the same, regardless of whether the references point to the same or different downlink reference signals.

[0264] The quasi-co-address type corresponding to each downlink reference signal can be given by the higher-level parameter qcl-Type in QCL-Info, and can take one of the following values: (1) “typeA”: {Doppler offset, Doppler dispersion, average delay, delay dispersion}; (2) “typeB”: {Doppler offset, Doppler dispersion}; (3) “typeC”: {Doppler offset, average delay}; (4) “typeD”: {spatial reception parameters}.

[0265] From another perspective, UE 200 can perform link adaptation via CSI-RS. Specifically, for channel state estimation purposes, UE 200 can be configured to measure CSI-RS and estimate downlink channel state based on CSI-RS measurements. UE 200 feeds back the estimated channel state to network equipment (e.g., gNB) for link adaptation.

[0266] Depending on the higher-level configuration (e.g., CSI-ReportConfig), CSI may include, but is not limited to, CQI, PMI, CSI-RS resource indication, LI and / or RI, and the associated CSI fields may generally be plotted in Table 14.

[0267]

[0268] Table 14

[0269] In one embodiment, CSI can be transmitted in different ways depending on the higher-layer configuration. In an aperiodic manner, such as when configured as "aperiodic", CSI can be transmitted via uplink grant downlink control information including a CSI request. In a semi-persistent manner, such as when configured as "semiPersistentOnPUCCH", CSI can be transmitted via a physical uplink control channel initiated by the MAC CE. Alternatively, when configured as "semiPersistentOnPUSCH", CSI can be transmitted via a CG-PUSCH initiated by uplink grant downlink control information including a CSI request. In a periodic manner, such as when configured as "periodic", CSI can be transmitted via a physical uplink control channel according to the configured periodicity.

[0270] In one embodiment, UE 200 may perform L1 measurements as part of an LTM or Conditional LTM (C-LTM) procedure. Based on the results of such measurements, UE 200 may change its serving cell by transmitting or receiving a cell handover command sent to or received from a network device (e.g., gNB) via MAC CE or RRC signaling. The cell handover command may include information related to a C-LTM / LTM candidate configuration previously prepared by the network device (e.g., gNB) and transmitted to UE 200 via RRC signaling. The candidate configuration may correspond to at least one candidate cell and may include information such as candidate ID, physical cell ID, SSB frequency, SSB subcarrier spacing, SSB periodicity, and / or SSB transmission power.

[0271] Upon receiving a cell handover command, the processor of UE 200 may determine that the cell handover procedure is complete after receiving additional information or configuration from the target candidate cell (e.g., via MAC CE or RRC signals). UE 200 may then switch to the target configuration corresponding to the received command.

[0272] In another embodiment, the C-LTM / LTM procedure may support intra-network device (e.g., gNB) - distributed cell mobility, intra-network device (e.g., gNB) - centralized cell network device (e.g., gNB) - distributed cell mobility, and may also support intra-frequency or inter-frequency mobility, including mobility to cells in non-serving frequency inter-cell environments. For example, C-LTM / LTM may support primary cell (PCell) changes in non-carrier aggregation and non-dual connectivity scenarios, primary and secondary cell (SCell) changes in carrier aggregation scenarios, or primary cell and secondary cell changes within primary cell groups in dual connectivity scenarios, as well as primary and secondary cell changes within secondary network nodes and secondary cell groups, all occurring without the participation of a primary node. However, C-LTM / LTM may not support simultaneous primary and secondary cell (PSCell) changes.

[0273] In addition, when the UE 200 has stored C-LTM / LTM candidate configurations, the UE 200 can also execute L3 handover (or cell handover) commands sent by the network, thereby using the pre-configured candidate configurations for efficient mobility management.

[0274] In embodiments of the present invention, UE 200 may perform CSI measurements and reporting for multiple cells according to a configuration received from gNB. The configuration may indicate a first set of reference signals (e.g., CSI-RS) and / or a reporting quantity. The first set of reference signals may be associated with a resource set ID (e.g., LTM-CSI-ResourceConfigID), and each reference signal may be indicated by at least one TCI status information to establish a quasi-co-location relationship with a downlink reference signal (e.g., SSB) associated with a candidate cell ID. The reporting quantity may include at least one of CSI-RS resource indication, RI, or CQI. At least one of the reference signals may be configured as a single antenna port, and the configuration may also include a rank restriction (e.g., ri-Restriction = 1).

[0275] In another embodiment, UE 200 may determine, select, or identify a second set of reference signals from the first set for CSI measurement. For example, for a third reference signal in the first set of reference signals, UE 200 may select the third reference signal as part of the second set based on at least one of the following: (i) the quality value (e.g., RSRP) of a fourth reference signal (e.g., SSB) that has a quasi-co-located relationship with the third reference signal, (ii) the quality value (e.g., RSRP) of the third reference signal itself, or (iii) an indication explicitly provided by the gNB.

[0276] In another embodiment, UE 200 may determine whether to perform a CSI measurement on at least one reference signal in the second set based on a threshold. For example, a CSI measurement may only be performed if the RSRP of the reference signal is higher than the threshold.

[0277] In a further embodiment, UE 200 may perform CSI measurements and reporting according to a configuration, wherein the configuration may indicate the reporting type. For example, the reporting type may be aperiodic, semi-persistent on PUCCH, semi-persistent on PUSCH, or periodic. The configuration may also indicate the reporting quantity, such as requiring UE 200 to report at least one of SSB resource indication, CSI-RS resource indication, PMI, CQI, RI, i1, or L1-RSRP.

[0278] In one embodiment, the present invention provides a method for processing CSI reports used by a UE, the method comprising: determining a first CSI based on a first set of reference signals, wherein the first set of reference signals is determined according to a first configuration transmitted by a network device; transmitting the first CSI to the network device according to the first configuration; determining a second CSI based on a second set of reference signals; performing a cell handover with a target candidate cell based on first information transmitted by the network device; transmitting the second CSI to the target candidate cell in response to determining that the second CSI does not include invalid CSIs; and transmitting the second CSI including at least one invalid CSI to the target candidate cell in response to determining that the second CSI includes at least one CQI corresponding to the lowest index.

[0279] In one embodiment, the second reference signal set is determined based on the second information.

[0280] In one embodiment, the first information and the second information are transmitted by the network device using the same information.

[0281] In one embodiment, the second information is associated with the first CSI.

[0282] In one embodiment, the second information is associated with at least one of cell identity and at least one first signal resource indication.

[0283] In one embodiment, each of the first set of reference signals is associated with a candidate cell index.

[0284] In one embodiment, each of the second reference signal set has a quasi-co-address relationship with the Synchronization Signal Block (SSB) index.

[0285] In one embodiment, the first CSI includes at least one of the following: a plurality of second signal resource indications; a reference signal received power (RSRP); or at least one differential RSRP.

[0286] In one embodiment, the first CSI includes a first number of distinct signal resource indications for each of a second number of candidate cells, wherein the first number and the second number are configured by higher-layer signaling.

[0287] In one embodiment, the second CSI includes at least one of the following: a third signal resource indicator; CQI; PMI; or RI.

[0288] In one embodiment, the second CSI transmits to the target candidate cell using a first PUSCH after receiving the second information.

[0289] In one embodiment, the second CSI is carried in a CSI report, and the CSI report is configured to be non-periodic.

[0290] In one embodiment, the first CSI is associated with a plurality of candidate cells; the second CSI is associated with the target candidate cell.

[0291] In one embodiment, the second reference signal set is determined based on a threshold.

[0292] In one embodiment, the second CSI is associated with a third number of candidate cells and a fourth number of reference signals for each of the third number of candidate cells.

[0293] In one embodiment, the method further includes: transmitting capability information to the network device, wherein the capability information includes at least one of the following: whether the UE supports a first CSI measurement and a first CSI report associated with the first CSI for at least one candidate cell; whether the UE supports a second CSI measurement and a second CSI report associated with the second CSI for the at least one candidate cell; whether the second CSI measurement is performed before or after receiving a cell handover command; the maximum number of candidate cells for the first CSI measurement or the second CSI measurement; the maximum number of reference signals for each cell or each SSB for the first CSI measurement or the second CSI measurement; capability regarding at least one of RI, CQI, PMI, and bandwidth indication; and whether it supports including the current SpCell in the first CSI report.

[0294] This invention provides a UE, including a transceiver and a processor. The processor is coupled to the transceiver and configured to perform: determining a first CSI based on a first set of reference signals, wherein the first set of reference signals is determined according to a first configuration transmitted by a network device; controlling the transceiver to transmit the first CSI to the network device according to the first configuration; determining a second CSI based on a second set of reference signals; performing cell handover with a target candidate cell based on first information transmitted by the network device; controlling the transceiver to transmit the second CSI to the target candidate cell in response to determining that the second CSI does not include invalid CSI; and controlling the transceiver to transmit the second CSI including at least one invalid CSI to the target candidate cell in response to determining that the second CSI includes at least one CQI corresponding to the lowest index of the second CSI.

[0295] In summary, in embodiments of the present invention, the UE can be configured by a network device with at least one reporting setting and / or resource setting for CSI measurement and reporting across multiple cells. The configuration may indicate a first set of reference signals, such as CSI-RS, associated with one or more candidate cells, and may further specify a reporting amount including at least one of CSI-RS resource indication, RI, and CQI. Each reference signal may be associated with TCI status information to establish a quasi-co-location relationship with one or more downlink reference signals (e.g., SSB) corresponding to the candidate cell identity.

[0296] Based on the configuration, the UE can determine or select a second set of reference signals from a first set for CSI measurement. Selection can be performed based on signal quality (e.g., the RSRP value of a reference signal or a quasi-co-located related reference signal) or on explicit gNB instructions. The UE can further determine whether to perform CSI measurement on at least one reference signal in the second set based on threshold conditions, thereby avoiding unnecessary measurements on low-quality reference signals.

[0297] CSI reporting can be performed in different ways depending on the higher-layer configuration, including aperiodic, semi-persistent (on PUCCH or PUSCH), or periodic reporting. CSI reporting can include various reporting quantities, such as SSB resource indication, CSI-RS resource indication, PMI, CQI, RI, i1, and L1-RSRP. By employing the configuration and selection mechanism of this invention, the UE can effectively perform CSI measurements and reporting across multiple cells, thereby improving mobility robustness, reducing signaling overhead, and enhancing link adaptation accuracy.

[0298] From another perspective, since the UE can obtain the necessary CSI measurements before performing cell handover, UPT will be less likely to experience [the following]. Figure 1 The downgrade is illustrated in the diagram.

[0299] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for processing channel state information reports used by user equipment, characterized in that, The method includes: First channel state information is determined based on a first set of reference signals, wherein the first set of reference signals is determined based on a first configuration transmitted by a network device; The first channel state information is transmitted to the network device according to the first configuration; The second channel state information is determined based on the second reference signal set; Cell handover is performed based on the first information transmitted by the network device and the target candidate cell; In response to determining that the second channel state information does not include invalid channel state information, the second channel state information is transmitted to the target candidate cell; and In response to determining that the second channel state information includes at least one invalid channel state information, the second channel state information including at least one channel quality indicator (CQI) corresponding to the lowest index is transmitted to the target candidate cell.

2. The method according to claim 1, characterized in that, The second set of reference signals is determined based on the second information.

3. The method according to claim 2, characterized in that, The first information and the second information are transmitted by the network device using the same information.

4. The method according to claim 2, characterized in that, The second information is associated with the first channel state information.

5. The method according to claim 2, characterized in that, The second information is associated with at least one of the cell identity and at least one first signal resource indication.

6. The method according to claim 1, characterized in that, Each of the first set of reference signals is associated with a candidate cell index.

7. The method according to claim 1, characterized in that, Each of the second set of reference signals has a quasi-co-address relationship with the SSB index of the synchronization signal block.

8. The method according to claim 1, characterized in that, The first channel state information includes at least one of the following: Multiple second signal resource indications; Reference signal received power RSRP; or At least one differential RSRP.

9. The method according to claim 1, characterized in that, The first channel state information includes a first number of different signal resource indications for each of the second number of candidate cells, wherein the first number and the second number are configured by higher-layer signaling.

10. The method according to claim 1, characterized in that, The second channel state information includes at least one of the following: Third signal resource indication; CQI; Precoding matrix indicates PMI; or Rank indicator RI.

11. The method according to claim 2, characterized in that, After receiving the second information, the second channel state information is transmitted to the target candidate cell using the first physical uplink shared channel (PUSCH).

12. The method according to claim 1, characterized in that, The second channel state information is carried in the channel state information report, and the channel state information report is configured to be aperiodic.

13. The method according to claim 1, characterized in that, The first channel state information is associated with multiple candidate cells; The second channel state information is associated with the target candidate cell.

14. The method according to claim 1, characterized in that, The second set of reference signals is determined based on a threshold.

15. The method according to claim 1, characterized in that, The second channel state information is associated with a third number of candidate cells and a fourth number of reference signals for each of the third number of candidate cells.

16. The method according to claim 1, characterized in that, Also includes: Transmit capability information to the network device, wherein the capability information includes at least one of the following: Whether the UE supports first channel state information measurement for at least one candidate cell and first channel state information reporting associated with the first channel state information; Whether the UE supports second channel state information measurement for the at least one candidate cell and second channel state information reporting associated with the second channel state information; The second channel state information measurement is performed before or after receiving the cell handover command; The maximum number of candidate cells for the first channel state information measurement or the second channel state information measurement; The maximum number of reference signals for each cell or each SSB for the first channel state information measurement or the second channel state information measurement; Capabilities related to at least one of RI, CQI, PMI, and bandwidth indication; Does it support including the current special cell SpCell in the first channel state information report? 17. A user equipment, characterized in that, include: transceiver; as well as A processor, coupled to and configured to execute: First channel state information is determined based on a first set of reference signals, wherein the first set of reference signals is determined based on a first configuration transmitted by a network device; The transceiver is controlled to transmit the first channel state information to the network device according to the first configuration. The second channel state information is determined based on the second reference signal set; Cell handover is performed based on the first information transmitted by the network device and the target candidate cell; In response to determining that the second channel state information does not include invalid channel state information, the transceiver is controlled to transmit the second channel state information to the target candidate cell; and In response to determining that the second channel state information includes at least one invalid channel state information, the transceiver is controlled to transmit the second channel state information, including at least one channel quality indicator (CQI) corresponding to the lowest index, to the target candidate cell.

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