CN-122002415-A - Method and user equipment for processing channel state information report

Abstract

The embodiment of the invention provides a method for processing a channel state information report and user equipment. The method includes determining a first CSI from 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 from a second set of reference signals, performing a cell switch with a target candidate cell according to 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 transmitting the second CSI including at least one Channel Quality Indicator (CQI) corresponding to a lowest index to the target candidate cell in response to determining that the second CSI includes at least one invalid CSI.

Inventors

• LI JIANMIN
• LUO LIZHONG
• CHEN RENXIAN
• WANG HONGXIANG

Assignees

• 财团法人工业技术研究院

Dates

Publication Date

20260508

Application Date

20251104

Priority Date

20251009

Claims (17)

1. 1. A method for processing a channel state information report for use by a user device, the method comprising: determining first channel state information from a first set of reference signals, wherein the first set of reference signals is determined from a first configuration transmitted by a network device; Transmitting the first channel state information to the network device according to the first configuration; Determining second channel state information according to the second reference signal set; Performing a cell handover with a target candidate cell according to first information transmitted by the network device; Transmitting the second channel state information to the target candidate cell in response to determining that the second channel state information does not include invalid channel state information, and In response to determining that the second channel state information includes at least one invalid channel state information, transmitting the second channel state information including at least one channel quality indication, CQI, corresponding to a lowest index to the target candidate cell.
2. 2. The method of claim 1, wherein the second set of reference signals is determined based on second information.
3. 3. The method of claim 2, wherein the first information and the second information are transmitted by the network device via the same information.
4. 4. The method of claim 2, wherein the second information is associated with the first channel state information.
5. 5. The method of claim 2, wherein the second information is associated with at least one of a cell identity and at least one first signal resource indication.
6. 6. The method of claim 1, wherein each of the first set of reference signals is associated with a candidate cell index, respectively.
7. 7. The method of claim 1 wherein each of the second reference signal sets has a quasi co-sited relationship with a synchronization signal block SSB index, respectively.
8. 8. The method of claim 1, wherein the first channel state information comprises at least one of: a plurality of second signal resource indications; Reference signal received power RSRP, or At least one differential RSRP.
9. 9. The method of claim 1, wherein the first channel state information comprises a first number of different 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 signals.
10. 10. The method of claim 1, wherein the second channel state information comprises at least one of: a third signal resource indication; CQI; Precoding matrix indicator PMI, or Rank indicates RI.
11. 11. The method of claim 2, wherein the second channel state information is transmitted to the target candidate cell using a first physical uplink shared channel, PUSCH, after receiving the second information.
12. 12. The method of claim 1, wherein the second channel state information is carried in a channel state information report, and wherein the channel state information report is configured to be aperiodic.
13. 13. The method of claim 1, wherein the step of determining the position of the substrate comprises, Wherein the first channel state information is associated with a plurality of candidate cells; wherein the second channel state information is associated with the target candidate cell.
14. 14. The method of claim 1, wherein the second set of reference signals is determined based on a threshold.
15. 15. The method of claim 1, wherein 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. 16. The method as recited in claim 1, further comprising: transmitting capability information to the network device, wherein the capability information includes at least one of: Whether the UE supports first channel state information measurements for at least one candidate cell and first channel state information reports associated with the first channel state information; whether the UE supports second channel state information measurements for the at least one candidate cell and second channel state information reports associated with the second channel state information; the second channel state information measurement is performed before or after receiving a cell handover command; A maximum number of candidate cells for the first channel state information measurement or the second channel state information measurement; A maximum number of reference signals per cell or per SSB for the first channel state information measurement or the second channel state information measurement; capability with respect to at least one of RI, CQI, PMI and bandwidth indication; whether the current special cell SpCell is supported to be included in the first channel state information report.
17. 17. A user device, comprising: Transceiver, and A processor coupled to the transceiver and configured to perform: determining first channel state information from a first set of reference signals, wherein the first set of reference signals is determined from a first configuration transmitted by a network device; Controlling the transceiver to transmit the first channel state information to the network device according to the first configuration; Determining second channel state information according to the second reference signal set; Performing a cell handover with a target candidate cell according to first information transmitted by the network device; controlling the transceiver to transmit the second channel state information to the target candidate cell in response to determining that the second channel state information does not include invalid channel state information, and In response to determining that the second channel state information includes at least one invalid channel state information, controlling the transceiver to transmit the second channel state information including at least one channel quality indication, CQI, corresponding to a lowest index to the target candidate cell.

Description

Method and user equipment for processing channel state information report Technical Field The present invention relates generally to communication mechanisms, and more particularly to a method and User Equipment (UE) for processing channel state information (channel status information, CSI) reports. Background In a fifth generation (5G) mobile communication system, a User Equipment (UE) may perform handover (or cell handover) between a plurality of cells to maintain service continuity. Layer 1/Layer 2 mobility (ltm) offers advantages in terms of reduced handover (or cell handover) delay and interruption time compared to Layer 3 based mobility procedures, and is therefore considered a promising low delay mobility solution. However, in the existing LTM procedure, layer 1 (L1) measurement is limited to measurement based on the synchronization signal block (Synchronization Signal Block, SSB). Currently, SSB-based L1 measurement procedures involve the UE receiving and evaluating SSB signals from multiple cells and reporting a subset of SSB resource indications (SSB Resource Indicator, SSBRI) based on signal strength pointers, such as reference signal received Power (REFERENCE SIGNAL RECEIVED Power, RSRP). While this provides basic channel quality information, accurate and timely channel estimation is still inadequate for immediately following a cell switch. As a result, the downlink modulation and resource allocation may not be optimally adjusted, resulting in degradation of user perceived throughput (User Perceived Throughput, UPT). Furthermore, existing systems do not incorporate measurement of CSI-RS (CHANNEL STATE Information REFERENCE SIGNAL, CSI-RS) into the L1 procedure of the LTM, which limits the ability of new generation base stations to obtain accurate CSI immediately after a cell switch. This limitation negatively impacts the performance of link adaptation and beam management, especially in situations involving high mobility or densely deployed multi-cell environments. Referring to fig. 1, a schematic diagram of applying CSI feedback effect is shown. In fig. 1, it is assumed that the UE performs a cell handover operation from a source cell to a target cell at a time point T01. As shown in fig. 1, if CSI feedback information (e.g., CQI (channel quality indicator, CQI), precoding matrix indication (precoding matrix indicator, PMI), CSI-RS resource indication (CSI-RS resource indicator, CRI), layer Indication (LI), rank Indication (RI), etc.) associated with a target cell is not available before a cell handover operation, user perceived throughput (user perceived throughput, UPT) of a UE may undergo a substantial degradation (e.g., about 75%) for a period of time after the cell handover operation. On the other hand, if CSI feedback associated with the target cell is available prior to the cell handover operation, the UPT of the UE does not experience the same degradation after the cell handover operation. Therefore, there is a need for a technical solution that incorporates CSI-RS measurements and reporting into the LTM procedure, thereby enabling improved channel state estimation after cell handover and enhanced overall system throughput and user experience. Disclosure of Invention Accordingly, the present invention is directed to a method of processing CSI reports and a UE, which may be used to solve the above-mentioned technical problems. Embodiments of the present invention provide a method for processing a CSI report for use by a UE, the method comprising determining a first CSI from a first set of reference signals, wherein the first set of reference signals is determined from 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 from a second set of reference signals, performing a cell handover with a target candidate cell according to 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 transmitting the second CSI including at least one CQI corresponding to a lowest index to the target candidate cell in response to determining that the second CSI includes at least one invalid CSI. The embodiment of the invention provides a UE (user equipment) which comprises 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 based on a first configuration transmitted by the network device, transmitting the first CSI to the network device based on the first configuration, determining a second CSI based on a second set of reference signals, performing a cell switch with a target candidate cell based on first information transmitted by the network device, controlling the transceiver to transmit the