VHT Compressed Beamforming Frame Segmentation for WLAN Bandwidth Conservation
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Solution Overview
Problem
In WLAN systems, unnecessary retransmissions and bandwidth wastage occur when a radio frame is partially received, leading to transmission failures, especially when the VHT Compressed Beamforming frame exceeds the maximum MPDU length and is segmented, causing the AP to consider the transmission as failed.
Innovation Solution
A method where the receiving station sends channel measurement information in segments, and the sending station considers a valid response if at least one segment is correctly received, avoiding unnecessary retransmissions and maintaining TXOP, with the option to request retransmission of incorrectly received segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the VHT Compressed Beamforming frame is segmented to reduce length, then the frame can be transmitted in manageable segments, but the receiving station may only correctly receive part of the segments causing unnecessary transmission failure declaration
Solution Approach 1:
The VHT Compressed Beamforming frame is divided into multiple segments that can be transmitted within an A-MPDU. Each segment contains a portion of the beamforming information, allowing the receiving station to process and utilize at least the correctly received segments without requiring complete frame reception for successful transmission determination.
2Loss of information
If partial segment reception is considered transmission failure, then complete data integrity is ensured, but unnecessary retransmissions occur wasting bandwidth resources
Solution Approach 1:
The system accepts partial reception of beamforming frame segments as sufficient for successful transmission determination. The receiving station can process and utilize the correctly received segments even if not all segments are received, thereby avoiding unnecessary retransmissions and conserving bandwidth resources while still achieving the required data integrity for beamforming operation.
3Reliability
If complete frame reception is required for successful transmission, then data integrity is maintained, but TXOP acquisition fails causing repeated channel contending reducing throughput
Solution Approach 1:
The invention allows the receiving station to determine successful transmission based on partial segment reception rather than requiring complete frame reception. This enables the station to retain correctly received segments and proceed with beamforming operations, thereby maintaining TXOP acquisition success and improving network throughput by eliminating unnecessary retransmission cycles.
4Device complexity
If the beamforming frame is transmitted as a single large unit, then transmission simplicity is maintained, but the frame exceeds maximum MPDU length requiring segmentation that complicates transmission management
Solution Approach 1:
The VHT Compressed Beamforming frame is segmented into multiple smaller units that can be transmitted within the constraints of maximum MPDU length. These segments are aggregated within an A-MPDU structure, allowing the receiving station to reconstruct the complete beamforming information while maintaining compliance with length restrictions and simplifying transmission management.
Data Source
Figure 1
Figure 2~4
AI summary
The disclosure provides a method and system for feeding back channel measurement information. The method includes: a receiving station receives a control frame for a channel measurement from a sending station, and sends channel measurement information to the sending station; the sending station correctly receives the channel measurement information or a part of the channel measurement information to obtain a valid response frame responding to the control frame for the channel measurement. Through the above solutions, if the sending station only correctly receives a part of the channel measurement information, the sending station does not consider this transmission is failed but consider that the valid response frame responding to the control frame for the channel measurement is obtained, so as to avoid unnecessary withdraw and retransmission, thereby saving bandwidth resources.