CSI Feedback Encoding via Non-Zero Coefficient Counting
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in CSI feedback due to the overhead required for reporting channel conditions, especially in MU-MIMO and spatial multiplexing systems where multiple channels or beams need to be reported.
Innovation Solution
The method involves determining the total number of non-zero coefficients associated with a CSI codebook over a set of transmission layers and encoding this information using a codeword from a candidate set, which is then included in the CSI feedback to a base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional CSI feedback methods are used to report channel conditions for multiple channels or beams in MU-MIMO and spatial multiplexing systems, then complete channel state information can be obtained, but the overhead for CSI reporting increases significantly
Solution Approach 1:
The patent extracts and reports only the essential channel state information parameters rather than complete CSI for all beams. By identifying and reporting only the dominant beam indices and their corresponding CSI values, the system removes redundant information while maintaining sufficient accuracy for MU-MIMO operations.
Solution Approach 2:
The patent applies different reporting strategies to different beams based on their significance. Dominant beams that contribute most to the channel are reported with full CSI information, while weaker beams are either reported with reduced information or not reported at all, optimizing the trade-off between accuracy and overhead.
2Quantity of substance
If the total number of bits for CSI feedback is reduced by not reporting zero amplitude beam vectors, then the overhead is decreased, but the system must efficiently identify and encode only non-zero coefficients
Solution Approach 1:
The patent performs preliminary identification of zero and non-zero amplitude beam vectors before encoding. By pre-determining which beam vectors have non-zero amplitudes and calculating their total count in advance, the system avoids the complexity of detecting and handling zero values during the encoding process, thereby reducing overall coding complexity while minimizing feedback bits.
Solution Approach 2:
The patent changes the encoding parameter from reporting individual beam amplitudes to reporting the total count of non-zero coefficients. This parameter transformation allows the receiver to reconstruct the CSI matrix efficiently by knowing exactly how many non-zero elements to expect, reducing the feedback bit quantity while maintaining decoding simplicity.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for preparing channel state information (CSI). One apparatus includes a processor and a memory with instructions executable by the processor to cause the apparatus to cause a base station to receive, from a user equipment (UE), CSI based on a CSI codebook which includes a plurality of precoding matrices; decode a codeword based on the CSI; determine a total number of non-zero coefficients based on the codeword, where the codeword identifies the total number of non-zero coefficients, and where the total number of non-zero coefficients is associated with the CSI codebook over a set of transmission layers.