Wireless Composite Beam Formation via Compression Matrix
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Solution Overview
Problem
Higher rank channel state information codebooks in wireless communication systems increase feedback overhead, limiting system performance gains due to increased feedback burden.
Innovation Solution
A compression matrix is applied to default individual beams to form composite beams, reducing feedback overhead while maintaining performance benefits, by combining multiple beams extending in different directions and determining beam weighting values for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher rank channel state information codebooks are used to enhance system performance, then data-rate performance is improved, but feedback overhead increases significantly
Solution Approach 1:
The codebook is segmented into a plurality of sub-codebooks, each associated with a specific beam combination. Instead of feedback for the entire high-rank codebook, the system provides separate feedback for each sub-codebook, reducing the overall feedback overhead while maintaining the ability to support high data-rate transmissions through selective sub-codebook usage.
Solution Approach 2:
The essential feedback information is extracted from the complex high-rank codebook structure. By identifying and extracting only the critical feedback parameters needed for each sub-codebook, the system reduces feedback overhead while preserving the performance benefits of higher rank transmissions.
2Productivity
If higher rank codebooks are used to support more simultaneous data signals, then system capacity increases, but the complexity of feedback management increases
Solution Approach 1:
The feedback management complexity is reduced by segmenting the codebook into sub-codebooks. Each sub-codebook can be independently managed and reported, simplifying the feedback management process compared to handling a single high-rank codebook, while still supporting multiple simultaneous data signals.
Solution Approach 2:
The system dynamically selects and activates specific sub-codebooks based on channel conditions and transmission requirements. This dynamic approach allows the system to adapt feedback management complexity to actual needs, using simpler feedback structures when possible while maintaining the capability for high-capacity transmissions when required.
Data Source
AI summary
A method and apparatus in a wireless communication device is provided. A reference signal is received from a network entity, and a default set of individual beams is defined, each of the beams having an associated direction. A compression matrix is determined, and an indication of the determined compression matrix is sent to the network entity. The compression matrix is applied to the default set of individual beams resulting in a new set of composite beams, where at least one of the composite beams includes a combination of multiple individual beams from the default set, and where the multiple individual beams included in the at least one of the composite beams each extend in a different direction. A set of beam weighting values is determined, and the determined set of beam weighting values is sent to the network entity.