TXOP Sharing Trigger Frames for Extended Multi-User WLAN Transmission
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Solution Overview
Problem
Existing wireless LAN systems lack efficient methods for transmission opportunity (TXOP) sharing among multiple users, particularly in scenarios where individual stations require extended transmission periods exceeding the maximum allocation duration from the access point, necessitating repeated medium contention.
Innovation Solution
A method and apparatus for TXOP sharing in wireless LAN systems that involve receiving a TXOP sharing trigger frame with user information fields, identifying allocation durations, determining a start time based on order or basic trigger frames, and transmitting data within these durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a station transmits data using traditional TXOP allocation from AP, then the station can perform transmission within allocated duration, but the transmission duration is limited and requires repeated medium contention for extended transmissions
Solution Approach 1:
The TXS trigger frame segments the total TXOP duration into multiple allocation durations, each assigned to different stations. This segmentation allows multiple stations to perform transmissions simultaneously within the same TXOP, eliminating the need for repeated medium contention and extending effective transmission duration for each station.
Solution Approach 2:
The AP performs preliminary action by allocating multiple TXOPs in advance through the TXS trigger frame before the actual data transmissions occur. This preliminary allocation of multiple transmission opportunities allows stations to perform extended transmissions without needing to contend for the medium repeatedly during the transmission period.
2Productivity
If the AP allocates TXOP to multiple stations individually, then each station receives dedicated transmission time, but the system requires complex scheduling and repeated medium access procedures
Solution Approach 1:
The invention merges multiple individual TXOP allocations into a single unified TXS trigger frame that contains multiple user information fields. This combining approach allows the AP to allocate transmission opportunities to multiple stations simultaneously in one operation, improving productivity while reducing scheduling complexity compared to individual allocations.
Solution Approach 2:
The TXS trigger frame serves multiple functions simultaneously: it acts as a scheduling mechanism, an allocation notification, and a synchronization signal for multiple stations. This multi-functionality reduces the need for separate control procedures, thereby improving transmission efficiency while minimizing system complexity.
3Duration of action of moving object
If a station requires transmission beyond maximum allocation duration, then the station can complete extended data transfers, but the station must engage in repeated medium contention increasing channel access delay
Solution Approach 1:
The AP performs preliminary action by pre-allocating multiple transmission opportunities within the TXS trigger frame before the station needs to transmit. This advance allocation of multiple TXOPs ensures that stations requiring extended transmission durations can complete their data transfers without engaging in repeated medium contention, thereby eliminating channel access delays.
Solution Approach 2:
The invention enables continuous useful action by providing multiple allocation durations to stations within a single TXS trigger frame. This continuity allows stations to perform extended transmissions back-to-back without interruption or medium contention, maximizing the utilization of transmission time and eliminating idle periods associated with channel access delays.
Data Source
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AI summary
The present disclosure relates to transmission opportunity (TXOP) sharing for multiple users in a wireless local area network (LAN) system. According to an embodiment of the present disclosure, a method performed by means of a station (STA) in a wireless LAN system comprises the steps of: receiving a TXOP sharing (TXS) trigger frame including a plurality of user information fields, each of the plurality of user information fields indicating a corresponding allocation period from among a plurality of allocation periods in a TXOP period related to the TXS trigger frame; identifying one or more allocation periods of the STA on the basis of one or more user information fields for the STA from among the plurality of user information fields; determining a start time of a first allocation period from among the one or more allocation periods on the basis of sequence information and/or a basic trigger frame; and transmitting data in the first allocation period after the start time.