Link Adaptation Feedback Frame for Space-Time Block Coding Selection
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Solution Overview
Problem
Conventional active link adaptation feedback mechanisms in wireless local area networks lack complete feedback information, leading to poor link adaptation performance due to the transmitter's inability to determine which data frame's conditions are related to the adaptation feedback, resulting in inadequate selection of space-time streams, bandwidth, and modulation and coding schemes.
Innovation Solution
A link adaptation feedback method that includes receiving a feedback frame carrying space-time block coding type indication information, allowing the transmitter to determine the use of space-time block coding by the related data frame and select appropriate space-time streams, bandwidth, and modulation and coding schemes for improved data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If active feedback mechanism is used, then feedback flexibility is improved, but feedback information completeness deteriorates
Solution Approach 1:
The patent introduces a feedback mechanism where the receiver sends feedback information to the transmitter, and the transmitter sends confirmation information back to the receiver. This two-way feedback ensures that the transmitter can accurately identify which data frame the feedback corresponds to, resolving the information completeness issue while maintaining the flexibility of active feedback.
Solution Approach 2:
The patent uses a feedback frame as an intermediary carrier that contains identification information about the data frame. This intermediary structure allows the receiver to provide feedback about specific frames without the transmitter needing to send explicit requests, thus maintaining active feedback flexibility while adding information completeness.
2Loss of information
If transmitter sends MFB request for passive feedback, then feedback information completeness is improved, but communication overhead increases
Solution Approach 1:
The patent extracts only the essential identification information from the feedback frame and uses it to determine the corresponding data frame. This extraction approach provides complete feedback information without requiring the transmitter to send comprehensive MFB requests, thus reducing communication overhead while maintaining information completeness.
3Device complexity
If transmitter selects transmission parameters without complete feedback, then device complexity is reduced, but link performance deteriorates
Solution Approach 1:
The patent performs preliminary action by having the receiver prepare and send feedback information containing data frame identification before the transmitter needs to select transmission parameters. This preliminary feedback allows the transmitter to make informed parameter selections with reduced complexity while improving link performance through accurate channel state information.
Data Source
AI summary
Embodiments of the present invention provide a link adaptation feedback method and a transmitting device. The method includes: receiving, by a transmitting device, a link adaptation feedback frame sent by a receiving device, where the link adaptation feedback frame carries space-time block coding type indication information; and determining, by the transmitting device according to the space-time block coding type indication information, information about use of space-time block coding by a data frame related to the link adaptation feedback frame. Through the embodiments of the present invention, and according to the use information, the transmitting device may select the space-time stream, and the MCS used when the transmitting device sends a data frame, thereby improving link performance.