PMI Coefficient Feedback Using Non-Zero Bitmap and Phase Indication
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Solution Overview
Problem
Existing technologies lack a method for terminals to effectively feed back precoding matrix indicator (PMI) combination coefficients in a combination coefficient matrix obtained through multiple time domain units, leading to inefficiencies in medium-to-high-speed channel state information feedback.
Innovation Solution
A terminal determines a target non-zero combination coefficient indication manner to feed back PMI combination coefficients, using methods such as non-zero combination coefficient indication bitmaps, amplitude indications, and phase indications to efficiently convey the PMI combination coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal feeds back all PMI combination coefficients in the combination coefficient matrix, then the channel state information feedback is complete and accurate, but the feedback overhead becomes large and inefficient
Solution Approach 1:
The patent extracts only the non-zero combination coefficients from the full PMI combination coefficient matrix and feeds back only these extracted coefficients. By identifying and transmitting only the essential non-zero elements rather than all coefficients, the solution reduces feedback overhead while maintaining the accuracy and completeness of channel state information.
Solution Approach 2:
The patent applies partial action by selecting and feeding back only a subset of combination coefficients (specifically the non-zero ones) rather than the complete set. This partial feedback approach is sufficient to achieve the required channel state information accuracy while significantly reducing the quantity of data transmitted.
2Productivity
If the terminal uses traditional PMI feedback methods, then the feedback process is simple, but the feedback efficiency is low and overhead is high for medium-to-high-speed channels
Solution Approach 1:
The patent performs preliminary action by pre-identifying and marking the non-zero combination coefficients in the PMI combination coefficient matrix before feedback transmission. This preliminary identification process enables the terminal to efficiently determine which coefficients need to be transmitted, thereby improving feedback efficiency while keeping the overall method relatively simple.
3Loss of information
If the terminal feeds back PMI combination coefficients from multiple time domain units, then the channel state information is comprehensive, but the feedback complexity and overhead increase
Solution Approach 1:
The patent merges the feedback of PMI combination coefficients from multiple time domain units into a unified feedback structure. By combining and processing the coefficients across different time domains together, the solution maintains comprehensive channel state information while managing feedback complexity through systematic integration rather than separate handling of each time domain unit.
Data Source
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AI summary
This application discloses a PMI combination coefficient feedback method and apparatus, a terminal, and a storage medium, and pertains to the wireless communication field. The PMI combination coefficient feedback method in embodiments of this application includes: The terminal determines a target non-zero combination coefficient indication manner used to feed back a PMI combination coefficient; or the terminal sends a parameter related to a target PMI combination coefficient, where the parameter related to the target PMI combination coefficient includes at least one of the following: a non-zero combination coefficient indication bitmap, indicating positions of all non-zero combination coefficients; a non-zero combination coefficient amplitude indication, indicating amplitudes of all the non-zero combination coefficients; and a non-zero combination coefficient phase indication, indicating phases of all the non-zero combination coefficients.