Multi-TRP CSI Reporting With Selective Codebook Restrictions
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Solution Overview
Problem
Existing wireless communication standards, such as 3GPP Release 16, do not provide explicit interference hypothetical testing to optimize precoders for each transmission and reception point (TRP) in multi-TRP operation, leading to increased UE complexity and power consumption.
Innovation Solution
Implementing rank restriction, Codebook Subset Restriction (CBSR), CMR/IMR time-domain restrictions, and enhanced CSI processing timelines to optimize CSI reporting for multi-TRP scenarios, including configuring different codebooks and restrictions for single-TRP and multi-TRP measurements, and reducing UE processing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If explicit interference hypothetical testing is implemented to optimize precoders for each TRP in multi-TRP operation, then precoder optimization and channel state information accuracy are improved, but UE complexity and power consumption increase
Solution Approach 1:
The patent segments the codebook into multiple codebook subsets, each corresponding to different interference hypotheses. Instead of testing all hypotheses exhaustively, the UE is configured to evaluate only specific codebook subsets based on predefined interference assumptions. This segmentation reduces the number of precoder candidates that need to be evaluated while maintaining accurate CSI reporting for multi-TRP operations.
Solution Approach 2:
The patent implements partial interference hypothetical testing by configuring the network to specify which interference hypotheses should be evaluated. The UE performs CSI reporting for a subset of interference scenarios rather than all possible hypotheses. This partial action approach provides sufficient precision for network optimization while significantly reducing UE processing complexity and power consumption compared to exhaustive testing.
2Measurement precision
If exhaustive interference hypothetical testing is performed for each TRP, then precoder optimization is improved, but power consumption increases
Solution Approach 1:
The codebook is divided into multiple codebook subsets, each representing different interference hypotheses. The network configures the UE to evaluate only specific subsets relevant to the current multi-TRP scenario. This segmentation allows the UE to perform precoder optimization with sufficient accuracy while avoiding the exponential increase in power consumption that would result from exhaustive testing of all possible interference hypotheses.
Solution Approach 2:
The patent changes the parameter of interference hypothesis evaluation from exhaustive to selective. By modifying the configuration to specify which interference hypotheses should be tested (rather than testing all hypotheses), the system achieves precoder optimization with significantly reduced computational burden and power consumption at the UE.
3Adaptability or versatility
If multiple codebooks are configured for single-TRP and multi-TRP measurements, then measurement flexibility and accuracy are improved, but processing overhead increases
Solution Approach 1:
The patent segments the overall codebook into multiple codebook subsets, where each subset is optimized for specific measurement scenarios (single-TRP or multi-TRP). This segmentation allows the network to configure appropriate codebooks for different measurement types without requiring the UE to process all possible codebooks simultaneously. The network can selectively activate specific codebook subsets based on the current operational mode, maintaining measurement flexibility while reducing processing overhead.
Solution Approach 2:
The system dynamically configures which codebook subsets should be evaluated based on the current operational scenario. The network can switch between configuring codebooks for single-TRP measurements, multi-TRP measurements, or combinations thereof, depending on the deployment scenario. This dynamic configuration allows the system to adapt to different measurement requirements while controlling processing overhead by only activating necessary codebook subsets.
Data Source
AI summary
Enhanced channel state information (CSI) reporting may include encoding a CSI reporting configuration associated with a first transmission and reception point (TRP) and a second TRP. The CSI reporting configuration may include at least one codebook configuration. The at least one codebook may include at least one of a rank restriction configuration or a codebook subset restriction (CBSR) configuration. The at least one of the rank restriction configuration or the CBSR configuration may correspond to at least one of a particular type of TRP measurement, a particular TRP of the first TRP or the second TRP, or channel measurement resources (CMRs) associated with at least one of the first TRP or the second TRP. A CSI measurement communication received from a user equipment (UE) may be decoded. The CSI measurement communication may be based on the decoded CSI reporting configuration.