Trigger-Enabled Restricted TWT Contention Control
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Solution Overview
Problem
Current wireless communication systems face challenges in managing contention and power consumption during target wake times (TWTs) in wireless local area networks (WLANs), leading to inefficiencies in channel access and potential collisions.
Innovation Solution
Implementing a trigger-enabled restricted wake time service period with controlled contention-based channel access, where the use of contention-based channel access is determined by the receipt of specific frames, reducing contention and collisions by maintaining or suspending access based on frame reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a station uses contention-based channel access during trigger-enabled TWT service period, then the station can access the wireless medium flexibly, but contention and collisions increase during the service period
Solution Approach 1:
The patent implements dynamic control of contention-based channel access by allowing stations to adjust their access behavior based on trigger frame reception. Stations can switch between enabled and disabled states for contention-based access during the TWT service period, optimizing both flexibility and collision reduction based on real-time conditions
Solution Approach 2:
The patent applies different channel access rules to different stations within the TWT service period. Stations that receive trigger frames are granted contention-based access while others are restricted, creating localized quality differences in access permissions that reduce overall contention while maintaining necessary flexibility for stations that need it
2Productivity
If a station monitors for trigger frames continuously, then the station can respond to channel access opportunities, but power consumption increases
Solution Approach 1:
The patent implements periodic monitoring within the TWT service period framework. Stations wake up at scheduled TWT intervals to monitor for trigger frames rather than continuously monitoring, and can return to sleep mode when not monitoring. This periodic action maintains responsiveness to channel opportunities while dramatically reducing power consumption compared to continuous monitoring
Solution Approach 2:
The patent allows stations to autonomously manage their own power consumption by entering restricted TWT states where they limit monitoring activity. Stations self-regulate their wake/sleep cycles based on TWT agreements, eliminating the need for continuous high-power monitoring while maintaining ability to respond to trigger frames when needed
3Reliability
If contention-based channel access is suspended during TWT service period, then collisions are reduced, but channel access efficiency decreases
Solution Approach 1:
The patent applies selective suspension of contention-based access to specific stations rather than all stations. Only stations that have not received trigger frames or are not authorized have their contention-based access suspended, while other stations maintain full access rights. This localized application reduces collisions for affected stations without impacting overall channel access efficiency
Data Source
AI summary
A station may be scheduled for a trigger-enabled restricted target wake time service period (TE r-TWT SP). Contention-based channel access may be enabled for the station during TE r-TWT SP based on the station not receiving a first frame during a first time period of the TE r-TWT SP. The enabled contention-based access may be suspended and/or maintained based on receipt of one or more frames by the station.