Compressed CSI Feedback Length Encoding for Lower Bit Overhead
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Solution Overview
Problem
In communication systems like LTE and NR, the efficient feedback of compressed downlink channel state information (CSI) to determine resource allocation, modulation and coding schemes, and precoding is challenging, leading to high overheads in information transmission.
Innovation Solution
A method and apparatus for compressed information feedback that reduces overheads by determining and indicating combinations of compressed information lengths using predefined rules or indication information, allowing for reduced bit usage in feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the lengths of L pieces of compressed information are independently indicated, then the indication is straightforward and clear, but the quantity of bits occupied increases significantly
Solution Approach 1:
The patent merges the indication of multiple compressed information lengths into a unified indication mechanism. Instead of independently indicating each length, the system uses a single indication value that represents a combination of lengths, thereby reducing the total bit overhead while preserving complete length information.
Solution Approach 2:
The patent transforms the one-to-one mapping between indication bits and length values into a many-to-one relationship. By introducing a combinatorial dimension, multiple length configurations can be represented by fewer indication bits, effectively reducing the indication overhead from a linear to a logarithmic scale.
2Productivity
If the quantity of combinations is limited to be less than or equal to all possible combinations, then the indication efficiency is improved, but the flexibility in representing different length distributions is reduced
Solution Approach 1:
The patent changes the parameter representation from individual length values to combinatorial indices. By transforming the indication parameter from direct length specifications to indices of pre-defined combinations, the system achieves more efficient indication while maintaining adequate flexibility through the combinatorial structure.
3Quantity of substance
If compressed information feedback is implemented to reduce overhead, then transmission efficiency improves, but the complexity of determining and indicating compressed information lengths increases
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple combinations of compressed information lengths before the actual feedback process. These combinations are prepared in advance and stored, allowing the terminal to simply select and indicate one of the pre-defined combinations rather than calculating and indicating individual lengths during real-time operation.
Data Source
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AI summary
A compressed information feedback method and an apparatus are provided. The method includes: A first communication apparatus determines L pieces of compressed information, where the compressed information is compressed information of a downlink channel; and the first communication apparatus sends the L pieces of compressed information and first indication information to a second communication apparatus, where the first indication information includes first information. According to the foregoing design, the first communication apparatus feeds back the first information to the second communication apparatus, where the first information may indicate one combination in at least one combination, and the at least one combination is determined based on a quantity L of the pieces of compressed information and/or a sum B of lengths of the L pieces of compressed information, to limit a possible value of the at least one combination, thereby reducing overheads of bits occupied by the first information. Compared with a manner of independently indicating the lengths of the L pieces of compressed information, this design can reduce information feedback overheads.