WLAN Relay TXOP Sharing Trigger Frame for Low-Delay Transmission
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Solution Overview
Problem
The challenge in wireless LAN systems is to provide a method and device for performing relay transmission based on a trigger frame, particularly for setting/indicating a TXOP for relay operations.
Innovation Solution
A method and device that utilize a multi-user (MU) request to send (RTS) transmission opportunity sharing (TXS) trigger frame to facilitate relay operations, with a common information field indicating the TXOP sharing procedure for relay operations, including specific subfields related to the relay operation or triggered TXOP sharing mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay transmission is performed to extend coverage and improve reception quality, then reception SNR and coverage range are improved, but transmission delay and system complexity increase
Solution Approach 1:
The AP allocates TXOP information in advance through a trigger frame before the actual relay transmission occurs. This preliminary allocation allows relay STAs to prepare their transmission resources and timing, reducing the delay that would otherwise occur during ad-hoc resource negotiation. The trigger frame contains pre-configured parameters including TXOP duration, MCS indices, and resource unit allocations that eliminate runtime decision-making delays.
Solution Approach 2:
The AP acts as an intermediary that coordinates the relay transmission between the original transmitter and receiver. By centralizing the TXOP allocation and control through the AP's trigger frame, the system avoids the complexity of direct peer-to-peer relay coordination, thereby reducing signaling overhead and transmission delay while maintaining improved reception SNR through the relay path.
2Reliability
If relay transmission is performed to extend coverage and improve reception quality, then reception SNR and coverage range are improved, but system complexity increases
Solution Approach 1:
The AP serves as a central intermediary that manages all relay transmission coordination. Instead of requiring complex peer-to-peer negotiation between multiple STAs, the AP's trigger frame centrally allocates TXOP resources, specifies relay STA selections, and configures transmission parameters. This centralized control significantly reduces the computational and signaling complexity that would otherwise be distributed across multiple devices.
Solution Approach 2:
The trigger frame mechanism serves multiple functions simultaneously: it allocates TXOP resources, selects relay STAs, configures MCS parameters, and coordinates resource unit assignments. By consolidating these multiple control functions into a single universal frame structure, the system avoids the complexity of implementing separate protocols for each function, thereby reducing overall system complexity while enabling relay transmission.
3Productivity
If TXOP sharing is implemented for relay operations, then transmission efficiency and throughput are improved, but frame structure complexity increases
Solution Approach 1:
The patent merges multiple control functions into a single trigger frame structure. The TXOP allocation information, relay operation parameters, resource unit assignments, and MCS configurations are all combined in one frame rather than requiring separate signaling messages. This merging reduces the number of frame exchanges needed, thereby improving transmission efficiency and throughput despite the increased complexity of the individual frame structure.
Solution Approach 2:
All necessary transmission parameters and resource allocations are preliminarily configured in the trigger frame before the actual data transmission begins. This preliminary action allows the relay STAs to prepare their transmissions without requiring additional coordination frames during the TXOP, thereby maximizing throughput. The increased frame structure complexity is justified by the elimination of multiple subsequent signaling exchanges.
Data Source
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AI summary
Disclosed are a method and apparatus operating in a wireless LAN system. A method performed by a first station (STA) in a wireless LAN system, according to an embodiment of the present disclosure, comprises the steps of: receiving, from an access point (AP), an MU-RTS TXS trigger frame including TXOP information assigned for performing a relay operation; and performing the relay operation on the basis of the MU-RTS TXS trigger frame, wherein a common information field of the MU-RTS TXS trigger frame comprises first information indicating that the MU-RTS TXS trigger frame is for a TXOP sharing procedure for the relay operation, and the first information may be based on at least one of a specific subfield related to the relay operation or triggered TXOP sharing mode subfield.