IoT Device TWT Beacon Listening Optimization
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Solution Overview
Problem
Low power Wi-Fi devices face challenges in efficiently utilizing the Target Wake Time (TWT) feature due to high power consumption and latency issues, especially when the TWT wake interval and wake duration are not optimally set.
Innovation Solution
The proposed system and method allow low power Wi-Fi devices to selectively listen to only a portion of the beacons transmitted by the access point, negotiating TWT parameters to minimize power consumption. The device exits low power mode only when necessary, based on application-specific latency and throughput requirements, and uses truncated beacons to maintain synchronization with the access point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the low power Wi-Fi device wakes up to listen to every beacon transmitted by the access point, then the connection synchronization is maintained, but the power consumption increases significantly
Solution Approach 1:
The patent segments the beacon listening process by having the device wake up only for specific beacon intervals rather than continuously monitoring. The device is configured to wake up for a predetermined number of beacons or at predetermined time intervals, then return to sleep mode. This segmentation of the monitoring duty cycle significantly reduces power consumption while maintaining sufficient synchronization for connection purposes.
Solution Approach 2:
The patent implements periodic action by establishing a rhythm where the device wakes up periodically to listen to beacons rather than continuously. The access point transmits beacons at regular intervals, and the low power device wakes up only for these periodic intervals to receive synchronization information, then returns to low power mode. This periodic monitoring pattern reduces energy consumption while maintaining connection synchronization.
2Use of energy by moving object
If the TWT wake interval and wake duration are increased to reduce power consumption, then the battery life is extended, but the data transmission latency increases
Solution Approach 1:
The patent applies dynamics by allowing the device to adjust its wake-up behavior based on actual network conditions and data requirements. Rather than using fixed wake intervals, the system can dynamically modify the wake-up pattern - waking up more frequently when data is needed and less frequently when power conservation is prioritized. This dynamic adjustment resolves the contradiction between power consumption and latency by adapting to varying operational needs.
Solution Approach 2:
The patent utilizes parameter changes by modifying the TWT wake interval and wake duration parameters based on application requirements and network conditions. The system can change these parameters to optimize the balance between power consumption and latency - increasing wake intervals to save power when latency is less critical, and decreasing them when data transmission speed becomes the priority. This parameter optimization resolves the trade-off between energy efficiency and transmission latency.
3Productivity
If the device exits low power mode more frequently to check for data, then the data throughput is improved, but the power consumption increases
Solution Approach 1:
The patent implements feedback mechanisms where the device uses information from beacons (such as Traffic Indication Maps) to determine whether it needs to wake up for data transmission. The feedback from the beacon information allows the device to make intelligent decisions about wake-up necessity - only waking up when data is actually available or expected, rather than periodically regardless of data presence. This feedback-based approach improves data throughput when needed while minimizing unnecessary wake-ups that would consume power.
Solution Approach 2:
The patent applies preliminary action by having the device check beacon information before fully waking up for data transmission. The device can preliminarily examine beacon data to determine if there is pending traffic or data to receive, and only then proceed to full wake-up mode for data transmission. This preliminary checking action prevents unnecessary complete wake-ups, thereby maintaining good data throughput when data is available while reducing power consumption by avoiding wake-ups when no data is present.
Data Source
AI summary
Methods and Wi-Fi devices that utilize the target wait time (TWT) feature of the Wi-Fi specification are disclosed. These methods reduce power consumption by selectively listening to only a portion of the beacons that are transmitted by the access point. In one scenario, the Wi-Fi device only listens to one beacon per TWT wake interval. In another embodiment, the Wi-Fi device may have knowledge of the application that is being executed, such as its allowable latency. The Wi-Fi device may use this allowable latency to determine when to exit low power mode to receive a beacon. Further, mechanisms to ensure that the connection between the Wi-Fi device and the access point are also disclosed. Additionally, techniques to maintain synchronization between the Wi-Fi device and the access point are disclosed.