Wi-Fi STR Link Pair for Low-Latency BA Feedback
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Solution Overview
Problem
The existing block acknowledgement (BA) mechanism in Wi-Fi technology is unable to meet the low-latency transmission requirements, particularly in scenarios involving multiple frequency bands, leading to prolonged transmission times and inefficient spectrum utilization.
Innovation Solution
Implementing a simultaneous transmit and receive (STR) link pair for data frames and block acknowledgement requests, allowing for concurrent data transmission and feedback across different communication links, thereby reducing the need for waiting until the completion of 1024 MSDUs before initiating feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the existing block acknowledgement (BA) mechanism is used to feedback 1024 MSDUs, then the transmission bandwidth is fully utilized, but the transmission time is prolonged and low-latency requirements cannot be met
Solution Approach 1:
The patent segments the feedback mechanism by separating data transmission and acknowledgement feedback into different communication links. Data frames are transmitted on one link while BA feedback is transmitted on another link, allowing parallel processing and reducing the sequential waiting time in the traditional single-link feedback mechanism.
Solution Approach 2:
The patent introduces a new dimension to the feedback mechanism by utilizing multiple communication links simultaneously. Instead of using a single link for both data transmission and feedback, the system transitions to a multi-link architecture where data and acknowledgements operate in parallel on different links, effectively adding a spatial dimension to the communication process.
2Device complexity
If data frames and block acknowledgement requests are transmitted on the same communication link, then the protocol complexity is reduced, but the transmission latency increases
Solution Approach 1:
The patent divides the communication function into separate links: one link dedicated to data frame transmission and another link dedicated to block acknowledgement request transmission. This segmentation allows both functions to operate simultaneously without interfering with each other, reducing latency while maintaining protocol simplicity on each individual link.
Solution Approach 2:
The patent combines multiple communication links to achieve parallel data and feedback transmission. By merging the capabilities of multiple links, the system achieves low-latency communication without increasing the complexity of the protocol on any single link, as each link maintains a simple dedicated function.
3Productivity
If multiple frequency bands are aggregated for communication, then the transmission rate is improved, but the coordination complexity increases
Solution Approach 1:
The patent assigns specific frequency bands to specific functions: one frequency band (or link) is dedicated to data transmission while another frequency band (or link) is dedicated to feedback transmission. This functional segmentation simplifies the coordination of multiple frequency bands by giving each band a clear, dedicated role, reducing the overall coordination complexity despite using multiple bands.
Data Source
AI summary
A communication method, performed by a transmitter, includes: sending a first data frame in a first communication link with a receiver; and sending a first block acknowledgement request (BA Request) frame corresponding to the first data frame in a second communication link with the receiver. The first communication link and the second communication link belong to a simultaneous transmit and receive (STR) link pair.