Channel State Information Reporting via Association Filtering
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently reporting channel state information, particularly in high-frequency bands like terahertz, where the number of dominant rays is limited, leading to increased overhead in feedback due to the need for multiple base stations and frequency regions, which complicates coordinated multiple-point transmission and reception (CoMP) operations.
Innovation Solution
The method involves using association information to selectively report channel state information, excluding or reducing the payload size for remaining base stations or frequency regions based on specific reference points, such as those with the highest channel quality indicators, to minimize feedback while maintaining effective communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel state information is reported for all base stations and frequency regions, then measurement precision is improved, but feedback overhead increases
Solution Approach 1:
The patent extracts and reports only the most critical channel state information parameters (CRI and PMI) while excluding redundant information. By identifying and reporting only the dominant ray characteristics through selective parameter extraction, the system maintains measurement precision for critical channels while significantly reducing feedback overhead.
Solution Approach 2:
The patent applies partial action by reporting channel state information for only the most significant base stations and frequency regions rather than all possible targets. The UE identifies dominant rays and reports information selectively for those exceeding threshold criteria, achieving sufficient measurement precision with reduced feedback quantity.
2Quantity of substance
If association information is used to reduce feedback, then feedback overhead is reduced, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring association information between channel state parameters and base stations/frequency regions before actual channel measurement. This pre-configuration includes establishing CRI-PMI associations and threshold criteria, so that during operation the UE can efficiently filter and report only relevant information without complex real-time processing.
3Reliability
If channel state information is reported for multiple base stations, then reliability of CoMP operations is improved, but feedback overhead increases
Solution Approach 1:
The patent applies local quality by differentiating the reporting requirements for different base stations based on their significance to the dominant rays. Instead of uniform reporting for all base stations, the system identifies which base stations contribute to dominant rays and reports detailed CSI only for those, while using association information for others, thus maintaining CoMP reliability with reduced overhead.
Data Source
AI summary
According to an embodiment of the disclosure, a method for reporting a plurality of channel state information by a user equipment (UE) in a wireless communication system comprises receiving association information related to a plurality of channel state reports and reporting a plurality of channel state information using the association information, wherein in reporting the plurality of channel state information, remaining channel state information except for specific channel state information among the plurality of channel state information is excluded from being reported or is reported in a form of a reduced payload size, according to the association information.