Directional Codebook Subset Restriction for Coherent Joint Transmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing coherent joint transmissions (CJT) between multiple transmission reception points (TRPs) due to the lack of effective codebook subset restriction criteria, leading to suboptimal spatial basis utilization and interference.
Innovation Solution
Implementing a codebook subset restriction (CBSR) criterion that jointly restricts spatial bases associated with multiple TRPs based on their directionality, ensuring coherent joint transmission by aligning their spatial characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TRPs perform coherent joint transmission without CBSR criterion, then transmission coverage and reliability are improved, but spatial basis utilization becomes suboptimal and interference increases
Solution Approach 1:
The patent applies parameter changes by modifying the codebook subset restriction criteria specifically for multi-TRP CJT scenarios. It introduces directionality-based spatial basis restrictions that dynamically adjust which spatial bases are allowed for transmission based on the geometric relationships between TRPs, thereby optimizing the balance between transmission reliability and interference reduction
Solution Approach 2:
The patent implements local quality by applying different CBSR criteria to different spatial directions and TRP configurations. It restricts spatial bases locally based on their directionality relative to each TRP, allowing optimal transmission in certain directions while suppressing interference in others, rather than applying uniform restrictions across all spatial dimensions
2Productivity
If spatial bases from multiple TRPs are jointly restricted based on directionality, then spectral efficiency is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-restricting the codebook subsets based on the known geometric relationships and directionality between TRPs. This allows the system to prepare optimal spatial basis restrictions in advance, improving spectral efficiency during actual transmission without requiring complex real-time calculations
Solution Approach 2:
The patent implements segmentation by dividing the codebook into multiple subsets based on spatial directionality and TRP configurations. Each subset contains spatial bases appropriate for specific geometric scenarios, allowing the system to select and apply only the relevant subsets for each transmission scenario, thereby managing complexity through structured organization
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may transmit, to a user equipment (UE), a codebook subset restriction (CBSR) criterion that is associated with a coherent joint transmission (CJT) by a plurality of transmission reception points (TRPs) and that indicates that a plurality of spatial bases, associated with the plurality of TRPs, are to be jointly restricted based at least in part on the plurality of spatial bases having a same directionality. The network node may receive, from the UE, a communication that is based at least in part on the CBSR criterion. Numerous other aspects are described.