Multi-Link TWT Configuration for Power Saving in Wireless LAN
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Solution Overview
Problem
Current wireless LAN technologies lack effective methods for low-power operations in multi-link environments, which are essential for efficient communication in high-throughput and real-time transmission scenarios, especially as they transition to extreme high throughput standards like IEEE 802.11be.
Innovation Solution
The proposed solution involves a method where a station (STA) configures and manages target wake time (TWT) service periods with an access point (AP) across multiple links, allowing for power-saving operations by synchronizing wake times and monitoring trigger frames within designated service periods, enabling low-power operation without simultaneous transmit and receive constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-link operations are implemented to support higher throughput and real-time transmission, then communication productivity is improved, but power consumption increases due to the need for continuous monitoring and coordination across multiple links
Solution Approach 1:
The patent implements periodic wake-up cycles where the station wakes up only during designated TWT (Target Wake Time) service periods to monitor for trigger frames and transmit/receive data, then returns to sleep mode. This periodic operation pattern allows the system to maintain multi-link communication capability while dramatically reducing average power consumption compared to continuous operation.
Solution Approach 2:
The patent uses preliminary action by having the access point send beacon frames in advance that indicate whether data needs to be transmitted during the upcoming TWT service period. This allows the station to make informed decisions about whether to wake up fully or can remain in a lower power state, optimizing the balance between communication needs and power consumption.
2Device complexity
If TWT service periods are configured identically across multiple links to simplify management, then device complexity is reduced, but communication reliability may deteriorate due to inability to optimize each link independently
Solution Approach 1:
The patent segments the TWT configuration by link, allowing each link to have its own TWT service period parameters (such as different wake-up times or durations) even though the basic TWT mechanism is applied consistently across all links. This segmentation enables independent optimization of each link's power saving parameters based on its specific traffic patterns and reliability requirements.
Solution Approach 2:
The patent implements dynamic TWT configuration where the service period parameters can be adjusted based on real-time conditions. The station can modify wake-up times, service period durations, and monitoring intervals dynamically to adapt to changing communication needs and link conditions, thereby maintaining reliability while managing complexity.
3Speed
If the station monitors trigger frames continuously to ensure quick data transmission, then response time is improved, but power consumption increases
Solution Approach 1:
Instead of continuous monitoring, the patent implements periodic monitoring where the station wakes up only during TWT service periods to monitor for trigger frames. This periodic monitoring maintains the ability to respond quickly to data transmission requests while consuming significantly less power than continuous monitoring would require.
Solution Approach 2:
The patent uses feedback mechanisms where the access point sends beacon frames indicating whether data needs to be transmitted during the upcoming TWT service period. This feedback allows the station to optimize its wake-up behavior and monitoring duration, ensuring quick response when needed while minimizing power consumption during periods when no data transmission is required.
Data Source
AI summary
Disclosed are a method and a device for saving power in a communication system supporting multiple links. An operation method of a first STA affiliated with a first device comprises: transmitting, to a first AP affiliated with a second device, a first frame which requests configuration of one or more TWT SPs for multiple links including a first link and a second link being in an NSTR relationship; and receiving, from the first AP, a second frame including configuration information of the one or more TWT SPs, wherein the one or more TWT SPs in the first link and the one or more TWT SPs in the second link are identically configured.