Compressed Channel Feedback Using Length Combination Signaling
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Solution Overview
Problem
In communication systems like LTE and NR, the efficient feedback of compressed downlink channel information from terminals to access network devices is challenging, leading to high overheads in information transmission.
Innovation Solution
A method and apparatus for compressing and feeding back downlink channel information by determining and indicating combinations of compressed information lengths, reducing the overheads through predefined rules and shared indication information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the terminal independently indicates the lengths of L pieces of compressed information, then the indication is straightforward and complete, but the quantity of bits occupied increases significantly
Solution Approach 1:
The patent merges the indication of multiple compressed information lengths into a unified combinatorial representation. Instead of independently indicating each length, the terminal indicates one combination from at least one combination set, where each combination contains L compressed information lengths. This merging reduces the total bit occupation while preserving complete length information.
Solution Approach 2:
The patent changes the parameter representation from individual length values to combinatorial indices. By indicating one combination in a predefined set of combinations rather than specifying each length separately, the system transforms the indication parameters, achieving more efficient bit utilization while maintaining information completeness.
2Quantity of substance
If the system limits the combinations of compressed information lengths, then the overhead of indication bits is reduced, but the flexibility in length configuration decreases
Solution Approach 1:
The patent applies preliminary action by predefining multiple combination sets of compressed information lengths before the actual indication process. These predefined combinations are established in advance, allowing the terminal to efficiently indicate the appropriate combination without real-time complex calculations, thus reducing overhead while maintaining flexibility through the pre-established variety of combinations.
Solution Approach 2:
The patent creates a universal indication mechanism that works across different scenarios. The combination-based indication system can adapt to various numbers of compressed information pieces (L) and different length configurations by selecting from predefined combination sets, making the system universally applicable while maintaining low overhead through the standardized combination representation.
Data Source
AI summary
A first communication apparatus determines L pieces of compressed information, where the compressed information is compressed information of a downlink channel; and sends the L pieces of compressed information and first indication information to a second communication apparatus, where the first indication information includes first information which indicates one combination in at least one combination that 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.