Quiet Interval Termination for r-TWT Channel Access Fairness
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Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring fair channel access and efficient resource utilization during restricted target wake time (r-TWT) operations, particularly due to the use of quiet intervals that can lead to unfair access and reduced throughput for stations supporting and not supporting r-TWT operations.
Innovation Solution
A method is introduced where an access point transmits a frame during a quiet interval to indicate the termination of the quiet interval, allowing stations to access the channel earlier, thus improving fairness and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If quiet intervals are implemented for r-TWT operations, then channel access control and resource allocation are improved, but channel access fairness and throughput for non-r-TWT stations deteriorate
Solution Approach 1:
The patent implements dynamic quiet interval termination by allowing the access point to send CF-END frames during ongoing quiet intervals based on real-time channel conditions and traffic requirements. This dynamic adjustment enables the system to adapt the quiet interval duration rather than strictly adhering to pre-configured intervals, thereby improving fairness for non-r-TWT stations while maintaining resource utilization for r-TWT operations.
Solution Approach 2:
The access point monitors channel conditions and traffic patterns during quiet intervals and uses this feedback information to decide when to terminate quiet intervals early. This feedback mechanism allows the system to respond to actual network conditions, ensuring that quiet intervals are maintained only as long as necessary for r-TWT operations, thus improving overall channel access fairness.
2Productivity
If quiet intervals overlap with r-TWT service periods, then resource allocation for r-TWT stations is improved, but packet transmission delays increase for other stations
Solution Approach 1:
The access point transmits CF-END frames during quiet intervals to preliminarily terminate the quiet interval before its configured end time. This preliminary action allows non-r-TWT stations to prepare for channel access in advance, reducing packet transmission delays while still maintaining the resource allocation benefits of quiet intervals for r-TWT operations.
Solution Approach 2:
The system dynamically adjusts the effective duration of quiet intervals by comparing the configured quiet interval end time with the actual r-TWT service period completion time. When the r-TWT service period completes early, the quiet interval is terminated early as well, preventing unnecessary delays for other stations while maintaining efficient resource allocation during the actual service period.
3Reliability
If stations set NAV based on quiet interval length, then channel access control is improved, but channel utilization and throughput are reduced
Solution Approach 1:
The access point sends CF-END frames during quiet intervals to preliminarily notify stations of the upcoming channel availability. This preliminary notification allows stations to clear their NAV counters and prepare for channel access before the quiet interval officially ends, improving channel utilization while maintaining reliable channel access control through the structured CF-END frame transmission mechanism.
Data Source
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AI summary
An access point (AP) transmits a first frame comprising: a Target Wake Time (TWT) element indicating a restricted Target Wake Time (r-TWT) Service Period (SP) of an r-TWT setup for one or more first stations (STAs); and a quiet element indicating a quiet interval for one or more second STAs, the quiet interval overlapping with a portion of the r-TWT SP. Based on determining termination of the r-TWT SP during the quiet interval, the AP transmits a second frame, during the quiet interval, indicating termination of the quiet interval for the one or more second STAs.