Precoding Matrix Feedback Compression for Multi-Beam Channel Reporting
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Solution Overview
Problem
In hybrid beamforming scenarios, the network device can only select one analog beam at a time, leading to reduced communication efficiency and increased power consumption due to time-sharing of pilot signals and higher feedback overheads for the terminal device.
Innovation Solution
Implement a precoding matrix transmission method that allows joint feedback of multiple groups of channel information simultaneously, using configuration information to determine precoding matrices and coefficients, and rearranging and compressing these matrices in both frequency and space domains to reduce feedback overheads and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the network device selects multiple analog beams and sends pilot signals in a time-sharing manner, then the terminal device can measure channel information for each beam, but the communication efficiency is reduced and feedback overheads increase
Solution Approach 1:
The patent merges multiple channel information measurements into a single joint feedback report. Instead of measuring and reporting channel information for each analog beam separately in time-sharing manner, the terminal device measures multiple channel information corresponding to multiple analog beams and sends them jointly in one feedback message, thereby improving communication efficiency while maintaining measurement precision
Solution Approach 2:
The patent enables a single feedback mechanism to serve multiple analog beams simultaneously. The joint feedback report structure is designed to carry channel information for multiple beams in a unified format, making the feedback system multi-functional and eliminating the need for separate feedback procedures for each beam
2Measurement precision
If the terminal device measures more pilot resources for multiple analog beams, then more channel information can be obtained, but power consumption increases
Solution Approach 1:
The patent combines multiple channel information measurements into a single joint feedback operation. By measuring multiple channel information in parallel and reporting them together in one feedback message, the terminal device reduces the total number of separate measurement and reporting operations, thereby reducing power consumption while maintaining comprehensive channel knowledge
Solution Approach 2:
The patent enables continuous measurement of channel information for multiple analog beams without interrupting the measurement process for each individual beam. The joint feedback mechanism allows the terminal to maintain continuous channel awareness across multiple beams while minimizing the energy cost of feedback transmissions
3Measurement precision
If the network device sends more reference signals for multiple analog beams, then the terminal device can obtain more channel information, but communication overheads increase
Solution Approach 1:
The patent merges the feedback reports for multiple channel information into a single joint feedback message. This consolidated feedback structure reduces the total quantity of feedback data transmitted over the air interface, thereby reducing communication overheads while still conveying comprehensive channel information for multiple analog beams
Solution Approach 2:
The patent introduces a new feedback dimension by organizing channel information from multiple beams into a joint report structure. Instead of increasing overhead through separate reports, the invention exploits the dimensional space of joint encoding to pack multiple channel information efficiently, reducing the overall feedback overhead
Data Source
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AI summary
This application provides a precoding matrix transmission method and a communication apparatus, to reduce overheads for feeding back channel information and reduce power consumption of a terminal device. The method includes: receiving first configuration information, where the first configuration information is for configuring resources of K port groups, each of the K port groups includes a plurality of antenna ports, and K is a positive integer; and sending first precoding matrix indicator PMI information, where the first PMI information is determined based on P groups of channel information, the P groups of channel information are determined based on a reference signal received on the resources of the K port groups, and P is an integer greater than 1.