Multi-TRP CSI Reporting with 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 channel state information reporting accuracy is improved, but UE complexity and power consumption increase
Solution Approach 1:
The patent segments the CSI reporting process by separating single-TRP and multi-TRP measurement configurations, applying different codebooks and restrictions to each scenario. This segmentation allows the UE to process interference hypothetical testing only when needed for multi-TRP operations, reducing overall complexity while maintaining accuracy where required.
Solution Approach 2:
The patent applies local quality by configuring different codebooks and restrictions specifically for single-TRP versus multi-TRP measurements. The UE can apply enhanced interference hypothetical testing and optimized precoder selection locally to multi-TRP scenarios while using simpler processing for single-TRP operations, thereby improving accuracy where needed without uniformly increasing complexity.
2Measurement precision
If enhanced CSI processing timelines with multiple codebooks are implemented, then channel state information reporting accuracy is improved, but UE processing overhead increases
Solution Approach 1:
The patent implements dynamic codebook selection where the UE can choose between different codebooks (first codebook for single-TRP, second codebook for multi-TRP) based on the measurement scenario. This dynamic approach allows the UE to adjust processing complexity and time requirements according to whether single-TRP or multi-TRP operations are detected, maintaining accuracy while reducing unnecessary processing overhead.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple codebooks and interference measurement resources before actual CSI reporting is needed. The UE can prepare and store these resources in advance, then quickly select and apply the appropriate codebook when measurement occurs, reducing real-time processing time while maintaining enhanced accuracy for multi-TRP scenarios.
3Measurement precision
If multiple codebooks and restrictions are configured for different TRP measurements, then channel state information reporting accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the codebook configuration into distinct first codebooks for single-TRP measurements and second codebooks for multi-TRP measurements, with separate interference measurement resource configurations. This segmentation allows the UE to manage complexity by processing and storing codebooks separately according to their application scenarios, reducing the cognitive load of managing a single monolithic codebook system.
Solution Approach 2:
The patent applies universality by designing a unified CSI reporting framework that can handle both single-TRP and multi-TRP operations through a single interface, with the UE selecting appropriate codebooks and restrictions based on the measurement type. This multi-functional design consolidates complexity management while maintaining the ability to provide enhanced accuracy for both scenarios without requiring separate independent systems.
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.