Frequency Domain Unit Granularity for Accurate PMI Feedback
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Solution Overview
Problem
Existing communication systems, particularly in 5G, face challenges in obtaining accurate precoding matrix indicator (PMI) feedback from terminal devices, which affects data transmission performance.
Innovation Solution
The method involves configuring the reporting bandwidth to include first-type frequency domain units for channel quality indicator (CQI) reporting and second-type frequency domain units for PMI reporting, where the granularity of the second-type frequency domain units is less than the first granularity, ensuring a higher pilot density and accurate PMI feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the frequency domain granularity for PMI reporting is reduced to improve feedback accuracy, then the pilot density decreases below the preconfigured threshold, but the PMI feedback accuracy improves
Solution Approach 1:
The reporting bandwidth is divided into multiple first-type frequency domain units with different granularities. Second frequency domain units at the edge have a first granularity (larger), while intermediate frequency domain units have a second granularity (smaller). This segmentation allows different regions to have different pilot densities, ensuring edge units meet the minimum pilot density threshold while intermediate units provide higher PMI feedback accuracy through finer granularity.
2Measurement precision
If the frequency domain granularity is made smaller to improve PMI reporting precision, then more frequency domain units are created, but the system complexity increases
Solution Approach 1:
Different frequency domain units are assigned different granularities based on their location within the reporting bandwidth. Edge units use a coarser first granularity to maintain pilot density, while intermediate units use a finer second granularity to improve PMI precision. This local differentiation optimizes overall system performance without uniformly increasing complexity across all units.
Data Source
AI summary
Embodiments of this application provide a method and a communications apparatus. The method includes: sending first indication information that configures reporting bandwidth comprising a plurality of first-type frequency domain units on which reporting of a channel quality indicator (CQI) is based, the plurality of first-type frequency domain units comprise one or more first frequency domain units and one or more second frequency domain units, a granularity of a first frequency domain unit of the one or more first frequency domain units is less than a preconfigured first granularity, a granularity of a second frequency domain unit of the one or more second frequency domain units is the first granularity, and the first granularity is a frequency domain granularity preconfigured for reporting the CQI; and determining a plurality of second-type frequency domain units on which reporting of a precoding matrix indicator (PMI) is based under different conditions.