Grouped Precoder Restriction Signaling for Large Codebooks
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Solution Overview
Problem
The existing methods for signaling codebook subset restrictions in wireless communication systems face high overhead due to the need to individually restrict each precoder, especially in large antenna arrays and multi-dimensional scenarios, where conventional bitmaps become inefficient and cumbersome, especially when frequently updated or applied to multiple users.
Innovation Solution
A method that generates codebook subset restriction signaling by jointly restricting precoders within groups based on common components, such as beam precoders, using techniques like Kronecker products and bit pattern signaling, to reduce the number of bits required for signaling, thereby lowering overhead while maintaining flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bitmap is used to signal codebook subset restriction for each precoder individually, then full flexibility in restricting precoders is achieved, but signaling overhead becomes excessively large
Solution Approach 1:
The patent merges multiple individual precoder restriction indicators into a single joint restriction indicator. Instead of using separate bits for each precoder, the invention groups precoders and uses a single bitmap element to restrict multiple precoders simultaneously, thereby reducing signaling overhead while maintaining flexibility through selective grouping.
Solution Approach 2:
The patent segments the codebook into multiple groups or subsets of precoders. By dividing the large codebook into smaller manageable groups, the system can apply restriction signaling more efficiently to each group rather than treating all precoders uniformly, reducing the total number of signaling bits required.
2Productivity
If codebook subset restriction is frequently updated to adapt to changing channel conditions, then system performance is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent implements dynamic codebook subset restriction where the restriction configuration can be adapted to changing channel conditions. The system dynamically selects which precoders to restrict based on current channel state, allowing performance optimization while managing signaling overhead through intelligent, condition-based restriction patterns.
3Measurement precision
If a large codebook is used to improve channel matching performance, then precoder selection accuracy is improved, but the complexity of signaling and processing restrictions increases
Solution Approach 1:
The patent segments the large codebook into multiple groups of precoders. This segmentation allows the system to maintain a large overall codebook for accurate channel matching while simplifying the restriction signaling process by applying restrictions to groups rather than individual precoders, thereby reducing processing complexity.
Data Source
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AI summary
A network node (10) signals to a wireless communication device (14) which precoders in a codebook are restricted from being used. The network node (10) in this regard generates codebook subset restriction signaling that, for each of one or more groups of precoders, jointly restricts the precoders in the group by restricting a certain component (e.g., a certain beam precoder) that the precoders in the group have in common. This signaling may be for instance rank-agnostic signaling that jointly restricts the precoders in a group without regard to the precoders' transmission rank. Regardless, the network node (10) sends the generated signaling to the wireless communication device (14).