CO-SR Frame Timing for Legacy STA Acknowledgement Overlap
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Solution Overview
Problem
In conventional CO-SR transmission, interference occurs between announcement frames and block acknowledgement frames due to overlapping transmissions from legacy stations, leading to unsuccessful reception by shared access points.
Innovation Solution
Implementing a transceiver that transmits a dummy clear-to-send frame or adjusts the length of data frames to align with acknowledgement frames, thereby avoiding interference in CO-SR transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional CO-SR transmission is used with legacy STAs, then the system maintains compatibility with older devices, but the BA frame from the STA overlaps with the next announcement frame from the sharing AP, causing reception failure
Solution Approach 1:
The shared AP performs preliminary action by shrinking the data frame transmission duration before the BA frame is sent, ensuring that the BA frame does not overlap with the subsequent announcement frame from the sharing AP. This proactive timing adjustment prevents the interference issue before it occurs.
Solution Approach 2:
The patent changes the time duration parameter of the data frame transmitted by the shared AP. By reducing the data frame length, the system ensures that the BA frame transmission completes before the announcement frame begins, eliminating the overlap and reception failure while maintaining legacy STA compatibility.
2Ease of operation
If the shared AP transmits data to legacy STAs using conventional timing, then the transmission follows standard protocols, but the BA frame overlaps with the announcement frame, preventing successful CO-SR transmission
Solution Approach 1:
The system dynamically adjusts the data frame transmission duration based on the STA type (legacy or non-legacy). For legacy STAs, the data frame is shortened to prevent BA frame overlap, while for non-legacy STAs, standard transmission is used. This dynamic adaptation maintains protocol compliance while enabling successful CO-SR transmission.
Solution Approach 2:
The shared AP determines in advance whether the associated STA is a legacy STA and pre-adjusts the data frame duration accordingly before transmission begins, ensuring that the BA frame timing will not conflict with the announcement frame from the sharing AP.
Data Source
AI summary
Coordinated-spatial reuse (CO-SR) transmission methods are provided. In a CO-SR transmission method, a transceiver of a sharing access point (AP) may transmit an announcement frame to a shared AP, the transceiver may receive a first block acknowledgement (BA) frame from a first station (STA) associated with the sharing AP, and the transceiver may transmit a dummy clear-to-send (CTS) frame before transmitting the next announcement frame in response to the first STA being a first legacy STA.