Multi-TRP CSI Reporting with RRC-Linked Calibration Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing channel state information (CSI) reporting and calibration, particularly in 5G/NR systems operating in higher frequency bands, due to hardware constraints and the need for improved radio interface efficiency and coverage.
Innovation Solution
The implementation of a user equipment (UE) and base station (BS) configuration that supports multiple CSI-RS resource sets and specific report quantities, linked via RRC parameters, to enhance CSI reporting, including a processor and transceiver for determining and transmitting CSI reports with defined settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple CSI-RS resource sets are configured for CJT calibration, then CSI reporting accuracy is improved, but device complexity increases due to additional resource management requirements
Solution Approach 1:
The patent segments the CSI-RS resources into multiple distinct resource sets, each associated with specific TRPs (Transmission Reception Points). This segmentation allows the UE to independently manage and report CSI for different TRPs, improving measurement precision for joint transmission calibration while organizing the complexity through structured resource division rather than monolithic resource management
Solution Approach 2:
The patent introduces a new dimension of resource organization by configuring CSI-RS resource sets with specific parameters including resource identifiers, quantity of resources, and associations with multiple TRPs. This multi-dimensional resource configuration (identifying resources not just by count but by spatial/TRP association) enables improved CSI accuracy for coordinated multi-point transmission while providing a systematic framework for managing the increased resource complexity
2Reliability
If NTRP CSI-RS resource sets with NTRP>1 are configured, then calibration performance for multiple TRPs is improved, but information overhead increases due to additional reporting parameters
Solution Approach 1:
The patent implements a universal CSI reporting framework where a single CSI report structure can handle multiple TRPs simultaneously. The report quantity parameter 'cri-RI-PMI-CQI' serves multiple functions by capturing beam management information, rank indicators, and channel quality for coordinated transmission across NTRP TRPs in one consolidated report, improving calibration performance while reducing the need for separate reporting mechanisms for each TRP
Solution Approach 2:
The patent merges the calibration information for multiple TRPs into a unified CSI reporting structure. By combining the calibration data from NTRP different TRPs into a single consolidated CSI report with integrated parameters, the system achieves improved multi-TRP calibration performance while minimizing information overhead through resourceful use of reporting channels rather than separate reports for each TRP
3Adaptability or versatility
If typeII-CJT codebook with multiple CSI-RS resources is used, then CSI reporting capability is enhanced, but processing requirements at UE increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring the typeII-CJT codebook parameters and CSI-RS resource associations through higher-layer signaling (RRC configuration) before actual CSI measurement and reporting. This preliminary configuration establishes the codebook structure, resource mappings, and reporting parameters in advance, enhancing the UE's CSI reporting capability for coordinated multi-point transmission while reducing real-time processing requirements during actual operation
Data Source
AI summary
Apparatuses and methods for channel state information (CSI) and calibration reporting. A method performed by a user equipment (UE) includes receiving information related to first and second CSI reports. The information for the first CSI report indicates NTRP CSI reference signal (CSI-RS) resource sets, NTRP>1, and a report quantity set to ‘cjtc-Dd’. The information for the second CSI report indicates NTRP CSI-RS resources, a report quantity set to ‘cri-RI-PMI-CQI’, and a codebook type set to ‘typeII-CJT-r18’. The first CSI report is linked to the second CSI report via a radio resource control (RRC) parameter. The method further includes determining, based on the information, a CSI for the second CSI report and transmitting the second CSI report including the CSI.