Channel State Information Feedback Overhead Reduction
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Solution Overview
Problem
Existing wireless communication systems face high feedback overheads due to the need to transmit channel state information for a large number of channel taps, leading to inefficiencies in beamforming protocols.
Innovation Solution
The proposed method reduces channel state information feedback overheads by generating a feedback frame that includes information indicating a subset of transmit antennas, sectors, or spatial streams, allowing only relevant channel state information to be fed back.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If time-domain feedback manner is used to feed back channel state information for all channel taps, then complete channel state information is provided, but feedback overheads become relatively high
Solution Approach 1:
The patent extracts and feeds back only the most significant channel state information corresponding to dominant channel taps rather than all channel taps. This selective extraction reduces feedback overhead while maintaining essential channel state information needed for beamforming operations.
Solution Approach 2:
The patent applies different feedback strategies to different channel taps based on their significance. Dominant channel taps receive detailed feedback while less significant taps are omitted or coarsely represented, creating local quality variation in the feedback information to optimize the trade-off between information completeness and overhead.
2Measurement precision
If feedback frame includes delay information and amplitude/phase shift for all channel taps, then accurate channel state information is achieved, but feedback frame size increases
Solution Approach 1:
The patent extracts only the delay information, amplitude, and phase shift parameters corresponding to dominant channel taps from the complete channel state information. By removing parameters associated with non-dominant taps, the feedback frame size is reduced while preserving the most critical channel characteristics.
Solution Approach 2:
The patent applies partial action by providing complete and accurate feedback information only for the most significant channel taps rather than attempting to provide equal precision for all taps. This selective precision approach reduces overall feedback frame size while maintaining sufficient accuracy for beamforming.
Data Source
AI summary
This application relates to the wireless communications field, and in particular, to a channel state information feedback technology. In a channel state information transmission method, a responder receives a channel measurement signal sent by an initiator by using one or more transmit antennas, and the responder sends a feedback frame to the initiator based on the channel measurement signal. The feedback frame includes information used to indicate a transmit antenna subset of the initiator and one or more channel state information blocks of a channel between the corresponding transmit antenna subset of the initiator and the responder, where the transmit antenna subset is determined from one or more transmit antennas by using which a channel measurement signal is sent.