Multi-AP Acknowledgement Retransmission for BA Collision Control
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Solution Overview
Problem
In multi-AP cooperation scenarios, there is a risk of BA collisions and inefficient retransmissions due to lost acknowledgement messages, which can be costly and unnecessary when multiple APs or associated STAs need to retransmit data.
Innovation Solution
Implement a retransmission mechanism for acknowledgement messages that coordinates wireless transmissions among APs, utilizing receive beamforming and sharing of BA information to optimize retransmissions based on cost analysis and resource occupancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If block acknowledgements are used in multi-AP cooperation, then transmission efficiency is improved, but the risk of BA collision and loss increases
Solution Approach 1:
The patent segments the BA reception process by introducing separate reception phases: a first phase where STAs transmit BAs during TXOPs, and a second phase where APs receive and store these BAs. This segmentation allows multiple APs to operate simultaneously without BA collisions, as each AP receives BAs in its own dedicated phase rather than competing for the same reception resources.
Solution Approach 2:
The patent applies preliminary action by having STAs transmit their BAs during the TXOP before the AP needs to process them. The BAs are transmitted in advance and stored by the AP, allowing the AP to later retrieve and process these BAs without interfering with other APs' operations. This advance preparation eliminates the need for simultaneous BA reception by multiple APs.
2Reliability
If retransmission mechanism is implemented for BA, then data transmission reliability is improved, but unnecessary retransmissions increase resource occupancy
Solution Approach 1:
The patent implements feedback by having the AP store received BAs and later retrieve them to determine whether data retransmission is necessary. The AP uses the stored BA information as feedback to make intelligent decisions about retransmission, allowing it to distinguish between cases where retransmission is needed (BA loss due to actual transmission failure) versus cases where retransmission is unnecessary (BA loss due to timing or coordination issues).
Solution Approach 2:
The patent applies dynamics by making the retransmission decision process adaptive and flexible. Rather than using fixed retransmission rules, the system dynamically adjusts retransmission behavior based on the specific circumstances of BA reception and storage. The AP can choose to retransmit data only when necessary, optimizing resource usage while maintaining reliability.
3Productivity
If multiple APs coordinate transmissions, then spectral efficiency is improved, but complexity of coordination increases
Solution Approach 1:
The patent segments the coordination process into distinct phases: a transmission phase where STAs send data and BAs during TXOPs, and a reception phase where APs receive and store BAs. This temporal segmentation simplifies coordination by allowing multiple APs to operate independently in different phases, reducing the complexity of real-time coordination while maintaining spectral efficiency through coordinated TXOP management.
Data Source
AI summary
An access point (10) of the wireless communication system performs one or more first wireless transmissions to one or more wireless devices (11) associated with the access point (10). The first wireless transmissions are coordinated with one or more second wireless transmissions of at least one other access point (10) of the wireless communication system. For at least one of the one or more first wireless transmissions, the access point (10) receives an acknowledgement message comprising first acknowledgement information indicating whether the first wireless transmission was successfully received. The acknowledgement message is based on a retransmission mechanism which controls retransmission of the first acknowledgement information.