Uplink Multi-User Transmission Scheduling in Wireless LAN
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Solution Overview
Problem
Current WLAN systems lack an efficient method for uplink multi-user transmission from non-AP stations to an access point, leading to inefficiencies in resource allocation and signaling overhead.
Innovation Solution
A method is introduced where an access point receives data from multiple stations, transmits downlink multi-user frames with uplink scheduling information, and receives uplink multi-user frames, minimizing signaling overhead by using specific indicators and timing mechanisms to coordinate data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-user scheduling is applied to uplink transmission from non-AP STAs to AP, then uplink transmission efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent combines downlink data transmission and uplink scheduling information transmission into a single downlink frame. The AP transmits both downlink data to STAs and uplink scheduling information for future uplink transmissions within the same frame structure, reducing the number of separate signaling exchanges and minimizing overhead while maintaining multi-user scheduling efficiency
Solution Approach 2:
The downlink frame is designed to serve multiple functions simultaneously: it carries downlink data for receiving STAs, includes uplink scheduling information for transmitting STAs, and provides resource allocation for future uplink multi-user transmissions. This multi-functional approach reduces the need for separate dedicated signaling frames, thereby reducing overall signaling overhead while enabling efficient uplink multi-user transmission
2Device complexity
If separate frames are used for downlink data and uplink scheduling, then frame structure simplicity is maintained, but transmission overhead increases
Solution Approach 1:
The patent merges downlink data transmission and uplink scheduling information into a single integrated downlink frame. This combination reduces the total number of frames required for both downlink and uplink operations, decreasing transmission overhead while the frame maintains a structured organization of different information elements for clarity and ease of processing
Data Source
AI summary
The present document relates to a method for efficiently performing uplink multi-user transmission in a wireless LAN system and an apparatus therefor. To this end, an access point (AP) may transmit a downlink multi-user frame to a plurality of STAs, receive an uplink frame including an acknowledgement/non-acknowledgement (ACK/NACK) signal for the downlink multi-user frame and an uplink scheduling request signal from at least two STAs among the STAs, transmit a downlink frame including uplink scheduling information to the at least two STAs on the basis of the uplink scheduling request signal, and receive an uplink multi-user frame including data from the at least two STAs in response thereto. Here, an SIG field of the downlink frame preferably comprises an indicator indicating that the downlink frame includes uplink multi-user scheduling information.