PMI Combination Coefficient Priority Mapping for Accurate CoMP CSI Feedback
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Solution Overview
Problem
In coordinated multiple point (CoMP) transmission scenarios, the priority order of precoding matrix indicator (PMI) combination coefficients fed back by terminals is inaccurate, leading to inefficiencies in channel state information feedback.
Innovation Solution
A method and apparatus for determining and mapping PMI combination coefficients to a CSI report based on descending priority order, ensuring accurate feedback by prioritizing coefficients according to their significance in coordinated transmission scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PMI combination coefficients are fed back without priority ordering in CoMP transmission scenarios, then the feedback process is simple, but the accuracy of channel state information feedback deteriorates
Solution Approach 1:
The patent applies preliminary action by determining the priority order of PMI combination coefficients before the actual feedback transmission. The terminal device calculates and sorts the priorities of multiple PMI combination coefficients corresponding to different reference resources in advance, then feeds back the coefficients according to this pre-established priority order. This ensures that the most important coefficients are transmitted first, improving feedback accuracy without adding complex real-time processing during transmission.
2Reliability
If multiple PMI combination coefficients are fed back simultaneously without priority mapping, then the feedback overhead is reduced, but the reliability of channel state information deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the feedback of PMI combination coefficients into different priority levels. Instead of treating all coefficients equally, the terminal device segments them based on their importance to channel state information accuracy, with higher-priority coefficients corresponding to more critical reference resources. This segmented approach ensures reliable transmission of essential information while managing feedback complexity through structured organization.
3Measurement precision
If PMI combination coefficients are ordered by priority before feedback, then the channel state information accuracy is improved, but the processing time increases
Solution Approach 1:
The patent applies self-service by enabling the terminal device to autonomously determine and sort the priority orders of PMI combination coefficients based on pre-configured rules and parameters. The terminal uses locally available information about reference resources and their associated coefficients to self-organize the feedback sequence without requiring external coordination or complex multi-device processing, thus improving accuracy while minimizing additional processing time.
Data Source
AI summary
A PMI combination coefficient sending method and apparatus, and a terminal are disclosed, which relate to the field of wireless communication. The PMI combination coefficient sending method provided in embodiments of this application includes: acquiring, by a terminal, a plurality of PMI combination coefficients to be fed back under coordinated transmission of a plurality of reference resources; for each of the PMI combination coefficients, determining a priority of the PMI combination coefficient; and mapping the plurality of PMI combination coefficients to a second part of a channel state information (CSI) report according to a descending order of priority for sending.