Uplink Multi-User Trigger Frame Scheduling in Wireless LAN
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Solution Overview
Problem
Current wireless LAN systems face limitations in uplink transmission efficiency, particularly in multi-user operations, due to constraints in resource allocation and scheduling, which affect performance and throughput.
Innovation Solution
A method for uplink multi-user (UL MU) operation in a wireless LAN system, where an access point receives a buffer status report frame from user stations, and based on this information, transmits a trigger frame to initiate UL MU transmission, allowing for efficient resource allocation and scheduling across multiple users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional uplink transmission methods are used in wireless LAN systems, then device-to-device communication can be established, but uplink transmission efficiency and throughput are limited due to constraints in resource allocation and scheduling
Solution Approach 1:
The patent segments the uplink transmission process into distinct phases: buffer status report phase, trigger frame transmission phase, and uplink data transmission phase. This segmentation allows the access point to receive buffer status information from multiple stations, make informed scheduling decisions, and coordinate multi-user uplink transmissions efficiently, thereby improving throughput while managing complexity through structured organization
Solution Approach 2:
The patent implements preliminary actions by having stations first transmit buffer status report frames to the access point before actual data transmission. The access point uses this advance information to prepare trigger frames with appropriate timing and resource allocation instructions. This preliminary information exchange enables efficient resource allocation and scheduling, resolving the contradiction between transmission efficiency and scheduling complexity
2Measurement precision
If buffer status report frames include detailed bitmap information for multiple access categories, then resource allocation precision is improved, but frame size and processing complexity increase
Solution Approach 1:
The patent applies partial action by including bitmap information only for access categories that have buffered data at each station. The buffer status report frame includes a control field indicating the number of access categories with data, allowing the access point to process only the relevant portions of the bitmap. This approach maintains precise buffer status reporting for active categories while avoiding unnecessary processing of empty categories, thus balancing measurement precision with processing complexity
Data Source
AI summary
A method for uplink multi-user (UL MU) operation in a WLAN system according to an embodiment of the present specification comprises the steps of: receiving, by an access point (AP), a buffer state report frame used for the UL MU operation from a user STA associated with the AP, wherein the buffer state report frame includes bitmap information for a plurality of access categories for which the buffer state of the user STA is to be reported, and identification information for a number of traffic identifiers (TIDs) for at least one traffic being buffered by the user STA, wherein the identifier information is set based on a number of the plurality of access categories indicated by the bitmap information; and transmitting, by the AP, a trigger frame for triggering the UL MU operation from a plurality of user STAs.