Beamforming Report Feedback Segmentation for Overhead Reduction
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Solution Overview
Problem
The increasing system bandwidth in communication technologies leads to high signaling overheads in beamforming report feedback, particularly due to the need to segment large reports and ensure fault tolerance, which complicates the transmission and reception of channel information across multiple subcarriers.
Innovation Solution
A method and apparatus that segment the beamforming report feedback by strategically selecting subcarriers based on bandwidth and grouping information, allowing for efficient transmission of channel information across multiple segments, where the space between subcarrier indexes is a multiple of N, enabling equivalent channel measurement results to be obtained from partial segments, thus reducing signaling overheads and improving fault tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the beamforming report includes all subcarriers to ensure complete channel information, then the accuracy of beamforming matrix generation is improved, but the signaling overhead increases
Solution Approach 1:
The patent segments the beamforming report into multiple parts, where each part contains channel information for a subset of subcarriers. The trigger frame indicates which specific parts should be fed back, allowing selective transmission of channel information for certain subcarrier groups while omitting others, thus reducing overall signaling overhead while maintaining sufficient accuracy for beamforming operations
Solution Approach 2:
The patent extracts and feeds back only the essential channel information needed for beamforming matrix generation. By using reference subcarriers and indicating specific subcarrier groups through the trigger frame, the system extracts only the critical channel state data required for effective beamforming, eliminating redundant information transmission
2Quantity of substance
If the beamforming report is segmented to reduce signaling overhead, then the signaling overhead is reduced, but the complexity of report transmission and reception increases
Solution Approach 1:
The patent performs preliminary organization of channel information into defined parts corresponding to specific subcarrier groups before feedback. The trigger frame is prepared in advance with explicit indications of which parts to transmit, allowing the beamformee to pre-organize the beamforming report into manageable segments with clear mappings to subcarrier ranges, simplifying the subsequent transmission and reception process
Solution Approach 2:
The trigger frame serves as an intermediary that carries both the request for specific beamforming report parts and the mapping information between report parts and subcarrier groups. This intermediary structure coordinates the segmented report transmission by providing a reference framework that simplifies the interaction between beamformee and beamformer regarding which channel information to transmit and how to interpret received segments
3Measurement precision
If all segments of the beamforming report must be transmitted to ensure accurate beamforming matrix generation, then the beamforming accuracy is maintained, but the reliability of the system under partial transmission conditions decreases
Solution Approach 1:
The patent enables partial action by allowing the beamforming matrix to be generated using only a subset of beamforming report segments. The trigger frame specifies which parts are necessary for accurate beamforming, and the system is designed to achieve sufficient beamforming performance with partial report transmission, rather than requiring complete transmission of all segments
Solution Approach 2:
The patent changes the parameter of beamforming report feedback from requiring complete transmission of all subcarrier information to selective transmission of specific subcarrier groups. By modifying the feedback mechanism to transmit only relevant parts indicated in the trigger frame, the system maintains beamforming accuracy while improving reliability under partial transmission conditions
Data Source
AI summary
This application discloses a beamforming report feedback method and an apparatus. The method includes: A first communication apparatus sends a trigger frame to a second communication apparatus; the second communication apparatus feeds back a beamforming report frame to the first communication apparatus after receiving the trigger frame. The trigger frame includes first information, the first information indicates the second communication apparatus to feed back at least one segment of a beamforming report. In addition, the beamforming report frame includes a first segment, the first segment indicates channel information on at least two subcarriers, a space between locations of indexes of any two of the at least two subcarriers in indexes of reference subcarriers is a multiple of N, and Nis an integer greater than or equal to 2. According to the method provided in this application, signaling overheads of the beamforming report can be effectively reduced.