Codebook Parameter Indication for Multi-TRP Precoding Overhead
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Solution Overview
Problem
In communication systems, the overhead of codebook parameter indication is high in multi-point cooperative transmission, particularly affecting precoding processes in coherent joint transmission, leading to inefficiencies in edge coverage and service quality.
Innovation Solution
A method and apparatus for terminals and network devices to efficiently indicate codebook parameters by using index-based information related to the numeric count of codebook parameters, reducing overhead and improving indication accuracy through methods like FD basis vector and SD basis vector pair indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If codebook parameter indication is performed in multi-point cooperative transmission, then precoding accuracy is improved, but indication overhead increases
Solution Approach 1:
The codebook parameter indication is divided into two parts: a first codebook parameter indication for a first TRP and a second codebook parameter indication for a second TRP. Each TRP has its own codebook parameters indicated separately, allowing for precise precoding control while managing overhead through structured segmentation of the indication process.
Solution Approach 2:
The patent introduces a codebook parameter indication list that maps to multiple codebook parameters through a one-to-many relationship. By using this list structure, the indication overhead is reduced while maintaining the ability to precisely control multiple codebook parameters across different TRPs, effectively adding a dimensional layer to the indication process.
2Reliability
If multiple TRPs are used for cooperative transmission, then edge coverage is improved, but system complexity increases
Solution Approach 1:
The system segments the cooperative transmission process by assigning different codebook parameters to different TRPs. The first codebook parameter indication corresponds to a first TRP and the second codebook parameter indication corresponds to a second TRP, allowing each TRP to operate with optimized parameters while maintaining overall system manageability through structured segmentation.
Solution Approach 2:
Each TRP is assigned specific codebook parameters tailored to its local conditions. The first TRP uses the first codebook parameters and the second TRP uses the second codebook parameters, allowing each TRP to optimize its local performance for edge coverage while the centralized controller manages the overall complexity through coordinated parameter indication.
Data Source
AI summary
An indication method is performed by a terminal, and includes: obtaining codebook parameter information indicated by a network device, wherein the codebook parameter information includes a numeric count of codebook parameters configured for a transmission reception point (TRP); and sending indication information to the network device, wherein the indication information indicates an index of a codebook parameter selected by the terminal for the TRP, and the index is related to the numeric count of codebook parameters.