WUR Beacon Wake-Up for Low-Power STA Coverage Detection
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Solution Overview
Problem
In WLAN systems, low-power stations (STA) face delays in determining their coverage status with respect to access points, leading to delayed communications due to the lack of efficient wake-up mechanisms for low-power operation modes.
Innovation Solution
The implementation of a method where a wake-up radio (WUR) beacon frame is used to transition the primary connectivity radio (PCR) from a sleep state to a wake-up state, allowing the STA to communicate with the access point, with the WUR beacon frame including a legacy preamble and a WUR physical convergence layer protocol (PCLP) protocol data unit (PPDU), and operating in either a normal or WUR mode based on determined operation parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a low-power STA operates in sleep mode to conserve energy, then energy consumption is reduced, but communication response time increases due to delayed detection of access point coverage
Solution Approach 1:
The radio system is segmented into two independent components: a primary connectivity radio (PCR) for full WLAN communication and a wake-up radio (WUR) for low-power coverage detection. The WUR operates independently in a wake-up state to monitor for beacon frames, while the PCR can sleep without full communication capability. This segmentation allows the STA to detect coverage quickly using the low-power WUR and only activate the power-hungry PCR when necessary, thus resolving the contradiction between energy saving and fast response.
Solution Approach 2:
The WUR performs preliminary coverage detection actions continuously in a wake-up state before the PCR needs to be activated. By having the WUR monitor for beacon frames in advance and maintain readiness to wake up the PCR, the system prepares for potential communication needs without keeping the full radio stack active, thereby reducing both energy consumption and response delay.
2Use of energy by moving object
If the PCR remains in sleep state to save power, then energy efficiency improves, but the STA cannot determine coverage status promptly
Solution Approach 1:
The detection function is segmented and assigned to the WUR, which operates independently with lower power consumption. The WUR is specifically designed for coverage detection tasks, maintaining wake-up state to accurately detect beacon frames while the PCR sleeps. This functional segmentation ensures coverage status detection accuracy is maintained without requiring the PCR to remain active.
Solution Approach 2:
The WUR acts as an intermediary between the sleep state PCR and the access point. It monitors the wireless environment for beacon frames and mediates the wake-up process by triggering the PCR activation when coverage is detected. This intermediary role enables accurate coverage detection while keeping the main communication radio in power-saving mode.
3Use of energy by moving object
If the STA uses a dual-radio architecture with WUR and PCR, then low-power operation capability is improved, but device complexity increases
Solution Approach 1:
The radio architecture is segmented into two specialized components with distinct functions: WUR for coverage detection and PCR for communication. This functional segmentation allows each component to be optimized for its specific task, with the WUR being a simplified low-power receiver and the PCR being a full-featured communication radio. The segmentation enables low-power operation while managing complexity through clear functional separation.
Solution Approach 2:
The WUR is designed as a universal wake-up mechanism that can work with standard IEEE 802.11 beacon frames, making it compatible across different WLAN implementations. By using a standardized approach where the WUR monitors for universal beacon signals and the PCR handles communication, the system achieves multi-functionality without excessive complexity, as both components follow established protocols.
Data Source
AI summary
A method and a device for searching for an access point in a wireless LAN are disclosed. An operating method of a station comprising a PCR and a WUR comprises the steps of: allowing the WUR operating in a wake up state to receive a WUR beacon frame from an access point; shifting an operating state of the PCR from a sleep state to the wake up state, when the WUR beacon frame is received; and allowing the PCR operating in the wake up state to communicate with the access point. Therefore, the performance of a communication system can be improved.