Trigger-Frame Relay Transmission for Low-Delay Wireless LAN Uplink
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Solution Overview
Problem
The challenge in wireless LAN systems is to provide a method and device for performing relay transmission, particularly uplink relay transmission, controlled by an access point and signaling transmission and reception, to improve reception SNR and reduce delay in signal transmission.
Innovation Solution
A method involving the generation and transmission of a trigger frame by a first station to request relay transmission, with specific address settings, and the reception and response by a second station to transmit a TB PPDU based on the trigger frame, enhancing relay transmission procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay transmission is performed to extend coverage and improve reception quality, then reception SNR is improved and delay is reduced, but the system complexity and signaling overhead increase
Solution Approach 1:
The patent introduces a trigger frame as an intermediary control mechanism that enables the AP to coordinate relay transmission between STAs. The trigger frame carries necessary control information (RA field, TA field, length field) to manage the relay process, reducing the complexity burden on individual STAs while maintaining reliable reception through coordinated multi-hop transmission
Solution Approach 2:
The patent segments the transmission process into distinct phases: trigger frame transmission, relay transmission response, and acknowledgment. This segmentation allows each component to be optimized independently - the trigger frame handles control signaling, while the TB PPDU handles data transmission, thereby managing overall system complexity through structured division of functions
2Reliability
If relay transmission is implemented to overcome range limitations and obstacles, then transmission reliability is improved, but the protocol complexity and signaling requirements increase
Solution Approach 1:
The trigger frame serves multiple functions simultaneously: it acts as a poll frame to solicit responses, a control frame to allocate resources, and a coordination mechanism for relay transmission. This multi-functionality reduces the need for separate specialized frames, thereby improving transmission reliability while limiting protocol complexity growth
Solution Approach 2:
The patent implements a feedback mechanism where the AP transmits a trigger frame based on buffer status or channel conditions, STAs respond with TB PPDU transmissions, and the AP provides acknowledgment. This closed-loop feedback ensures reliable transmission by allowing the AP to adapt relay transmission parameters based on actual channel conditions and reception quality
Data Source
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AI summary
A method and apparatus operating in a wireless LAN system are disclosed. The method performed by a first station (STA) in a wireless LAN system, according to an embodiment of the present disclosure, comprises the steps of: generating a first trigger frame for soliciting a relay transmission; and transmitting the first trigger frame to at least one non-AP STA, wherein the first trigger frame includes first information indicating whether or not the first trigger frame is a trigger frame for a relay transmission, a transmitter address (TA) field of the first trigger frame is configured with a basic service set ID (BSSID) or an ID of the first STA, and a receiver address (RA) field of the first trigger frame may be configured with an ID of at least one STA, a broadcast ID, or a group ID according the number of the at least one STA.