Trigger Frame Transmission for Uplink Data in Dense WLAN
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Solution Overview
Problem
Next-generation wireless local area networks (WLANs) face challenges in improving spectrum efficiency and area throughput, especially in dense environments with multiple access points and stations, where existing technologies limit the efficient transmission of uplink data due to interference and high user loads.
Innovation Solution
A method for transmitting a trigger frame that requests uplink data through individually configured radio resources in an overlapping time interval, where an access point receives buffer status frames from multiple terminals, determines a primary access category based on quality of service information, and transmits the trigger frame through the corresponding downlink buffer, enabling efficient multi-user uplink data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple terminals transmit uplink data simultaneously in overlapping time intervals, then spectrum efficiency and area throughput are improved, but interference between transmissions increases and transmission reliability deteriorates
Solution Approach 1:
The patent segments the uplink transmission process by having the AP send trigger frames to different terminals in different time intervals. The trigger frame includes a 'Trigger Dependent User Priority' field that segments users into different priority groups, allowing controlled simultaneous transmissions while managing interference through time-division and priority-based scheduling.
Solution Approach 2:
The patent changes the parameter of transmission timing by using variable time intervals between trigger frames sent to different terminals. The AP adjusts the timing parameters based on buffer status and QoS requirements, dynamically optimizing the balance between spectrum efficiency and interference levels.
2Adaptability or versatility
If the access point serves multiple terminals with different QoS requirements, then service versatility is improved, but determining transmission priority becomes more complex
Solution Approach 1:
The patent applies local quality by assigning different priority levels to different users based on their individual QoS requirements. The 'Trigger Dependent User Priority' field in the trigger frame allows the AP to customize priority settings for each terminal locally, enabling versatile service support while maintaining a relatively simple centralized priority determination mechanism at the AP.
3Productivity
If uplink data transmission is requested through individually configured radio resources, then transmission efficiency is improved, but resource allocation complexity increases
Solution Approach 1:
The patent implements preliminary action by having terminals report their buffer status to the AP before actual data transmission. The AP uses this advance information to pre-configure radio resources and send trigger frames that specify individual resource allocations. This preliminary resource configuration simplifies the actual transmission process while maintaining high transmission efficiency.
Data Source
AI summary
According to one embodiment of the present specification, a method for transmitting a trigger frame for requesting uplink data to be received through an wireless resource individually configured in an overlapped time duration from a plurality of terminals in a wireless LAN system, comprises: a step for receiving, by an access point, a first buffer state frame from a first terminal, wherein the first buffer state frame includes first QoS information of first uplink data; a step for receiving, by the access point, a second buffer state frame from a second terminal, wherein the second buffer state frame includes second QoS information of second uplink data; a step for determining, by the access point, a first primary AC for a trigger frame on the basis of the first QoS information and the second QoS information, wherein the access point includes a plurality of AP buffers for downlink data to be transmitted to a plurality of terminals; and a step for transmitting, by the access point, the trigger frame through the downlink buffer corresponding to the determined first primary AC among the plurality of AP buffers.