Station-Initiated TWT Termination for WLAN Power Saving
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing Target Wake Time (TWT) operations in wireless networks do not achieve optimal power savings due to complexities and inefficiencies in managing station activity.
Innovation Solution
A station sends a notification to an access point to terminate a TWT service period, receives an acknowledgement, and then enters a low power mode or switches to another wireless protocol, enabling extended power savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a station remains awake during the entire TWT service period to ensure data communication availability, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The station sends a termination notification frame to the access point before the service period ends, allowing the AP to prepare for early termination. This preliminary action enables the station to enter low power mode earlier than the scheduled end time, reducing power consumption while maintaining communication reliability through proper protocol coordination.
Solution Approach 2:
The access point sends an acknowledgement frame in response to the termination notification. This feedback mechanism ensures that the station and AP are synchronized regarding the early termination, allowing the station to confidently enter low power mode while the AP waits for any remaining data transmissions, thus balancing power savings with communication reliability.
2Use of energy by moving object
If the station enters low power mode immediately upon TWT service period expiration, then power savings are maximized, but response time for incoming data increases
Solution Approach 1:
The station initiates the termination process by sending a notification frame before the scheduled service period ends. This allows the station to enter low power mode earlier, extending the power savings duration while the AP handles any pending data transmissions during the transition period.
Solution Approach 2:
The TWT service period termination mechanism introduces dynamic adjustment capability, allowing the actual service period duration to be extended or reduced based on real-time communication needs. The station can terminate early when no data is pending, maximizing power savings, or extend if data communications are anticipated, thus optimizing the balance between power savings and response time.
3Use of energy by moving object
If the station uses complex TWT management protocols to optimize power savings, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The patent extracts the termination initiation function from the AP and assigns it to the station. By allowing the station to send termination notifications and manage its own power state transitions, the complexity of TWT management is distributed more evenly, reducing the burden on the AP while enabling stations to optimize their own power efficiency without requiring complex centralized coordination.
Solution Approach 2:
The station autonomously manages its TWT service period termination by detecting when to send termination notifications and by independently entering low power mode upon receiving acknowledgments. This self-service approach simplifies the overall system architecture by eliminating the need for complex AP-controlled termination mechanisms, while still achieving optimal power efficiency through station-initiated early terminations.
Data Source
AI summary
In one embodiment, a method includes: sending, from a station to an access point, a notification of a termination of a service period in which the station is awake, the notification comprising a station-based initiation of the termination of the service period, the station and the access point present within a wireless local area network; receiving, in the station from the access point, an acknowledgement of the notification; and in response to the acknowledgement, terminating the service period.