Relay STA Detection Requests for Reliable WLAN Coverage Extension
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Solution Overview
Problem
Existing wireless LAN systems face challenges in efficiently detecting non-AP STAs for reliable relay operations, particularly in next-generation standards like IEEE 802.11be and IEEE 802.11bn, which require improved detection methods to ensure reliable transmission and extended coverage, especially in IoT devices and outdoor environments.
Innovation Solution
A method involving a detection request frame transmitted from an Access Point (AP) STA to a relay STA, with the relay STA performing a detection procedure based on Physical Protocol Data Units (PPDUs) from non-AP STAs, and reporting detection results to the AP, enabling accurate detection and control of non-APs and link quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay operations are performed without efficient STA detection, then coverage extension is achieved, but transmission reliability deteriorates due to inability to identify suitable relay targets
Solution Approach 1:
The patent applies preliminary action by having the AP transmit a detection request frame to the relay STA before actual relay operations begin. This allows the relay STA to pre-detect non-AP STAs and report their presence and link quality, ensuring reliable relay target identification is completed in advance, thus improving transmission reliability without adding operational complexity during data transmission.
2Measurement precision
If detection request frames are transmitted to relay STAs, then accurate STA detection is achieved, but system overhead increases
Solution Approach 1:
The patent applies self-service by designing the detection mechanism where the relay STA autonomously performs detection of non-AP STAs using the detection request frame from the AP, and automatically reports detection results including link quality information. This self-service detection approach achieves accurate STA identification while minimizing AP involvement and reducing overall system overhead compared to AP-centric detection methods.
3Area of stationary object
If relay STAs detect and report non-AP STAs, then coverage holes are eliminated, but energy consumption increases
Solution Approach 1:
The patent applies periodic action by implementing detection request frames that can be transmitted at specific intervals or triggered by specific conditions rather than continuously. The AP can control when detection occurs by sending detection requests periodically or on-demand, allowing relay STAs to enter low-power states between detection cycles, thus expanding coverage while managing energy consumption through time-based control.
Data Source
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AI summary
TECHNICAL FIELD For example, a technical feature of the present disclosure may be related to a method performed in a wireless local area network (WLAN) system. For example, a method of the present disclosure may comprise a step of transmitting a detection request frame by an access point (AP) station (STA) to a relay STA. The detection request frame comprises control information for a non-AP STA detection procedure performed by the relay STA, and the non-AP STA detection procedure may be performed on the basis of a physical protocol data unit (PPDU) transmitted from at least one non-AP STA to the AP STA. In addition, in the method of the present disclosure, the AP STA may receive, from the relay STA, report information of the non-AP STA detection procedure performed by the relay STA. In this case, the report information may comprise information on at least one non-AP obtained by the relay STA.