Multi-Link Wi-Fi Scheduling for r-TWT Channel Access Protection
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Solution Overview
Problem
Existing technologies lack defined rules for coordinating operations between enhanced multi-link single radio (EMLSR) or enhanced multi-link multi-radio (EMLMR) links to protect channel accessing during a restricted target wake time (r-TWT) service period, leading to conflicts and interference with r-TWT scheduled stations.
Innovation Solution
A communication method and device that cause stations affiliated to a multi-link device (MLD) to enter a listening operation state before or during the r-TWT service period, and ensure that r-TWT service periods on multiple links do not overlap in time, using operations such as terminating transmission opportunities, delaying frame exchanges, and managing transition delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If stations affiliated to a multi-link device perform frame exchange operations on multiple links simultaneously, then the productivity and utilization of communication resources are improved, but conflicts and interference with r-TWT scheduled stations occur during r-TWT service periods
Solution Approach 1:
The patent applies preliminary action by requiring non-r-TWT stations to terminate their frame exchange operations before the r-TWT service period begins. Specifically, the station must end frame exchange at least SIFS time before the r-TWT SP start time, ensuring that the r-TWT scheduled station can access the channel without interference. This advance termination prevents conflicts while allowing normal multi-link operations during non-r-TWT periods.
2Productivity
If r-TWT service periods are scheduled on multiple links without coordination, then the productivity and service coverage are improved, but time overlaps occur causing interference and access conflicts
Solution Approach 1:
The patent implements feedback mechanisms where the AP MLD coordinates r-TWT service period scheduling across multiple links. The AP MLD receives r-TWT setup requests from non-AP MLDs, schedules r-TWT SPs on different links, and provides feedback to ensure no time overlaps occur. This coordinated scheduling allows multiple links to provide service coverage while preventing access conflicts through centralized control and timing coordination.
3Productivity
If stations extend transmission opportunities beyond r-TWT service period start time, then the productivity and data transmission efficiency are improved, but interference with r-TWT scheduled stations occurs
Solution Approach 1:
The patent applies preliminary anti-action by requiring stations to preemptively terminate ongoing frame exchanges before the r-TWT service period begins. Even if a frame exchange is in progress, the station must end it at least SIFS time before the r-TWT SP start time. This prevents any potential interference with r-TWT scheduled stations while allowing efficient data transmission during non-r-TWT periods.
Data Source
AI summary
A communication method includes: performing, by a first MLD, a first operation, the first operation being used to cause a first STA affiliated to a non-AP MLD to enter a listening operation state before a start point of a first r-TWT SP, where the first STA is an r-TWT scheduled station corresponding to the first r-TWT SP.