Uplink MU OFDMA Trigger Frame Resource Allocation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently supporting uplink multi-user transmission in dense environments with many access points and stations, particularly in improving spectrum efficiency and throughput, especially in outdoor scenarios and environments with high user loads and interference.
Innovation Solution
The implementation of an uplink multi-user (MU) transmission method using orthogonal frequency division multiple access (OFDMA) with a trigger frame that includes resource allocation information, allowing stations to send physical protocol data units (PPDUs) based on allocated resource units and receive ACK frames, while the physical preamble carries transmission parameter information such as modulation and coding schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink multi-user transmission is implemented in dense environments with many access points and stations, then spectrum efficiency and throughput are improved, but system complexity and interference management become more difficult
Solution Approach 1:
The system segments the uplink transmission resources by dividing the available spectrum into multiple orthogonal frequency subcarriers that can be independently allocated to different users. This segmentation allows multiple users to transmit simultaneously on different frequency resources without interfering with each other, thereby improving spectrum efficiency while maintaining manageable system complexity through structured resource division.
Solution Approach 2:
The patent introduces frequency dimension allocation for uplink multi-user transmission by assigning different sets of orthogonal frequency subcarriers to different users. This dimensional approach transforms the single-user single-frequency transmission model into a multi-user multi-frequency model, enabling simultaneous transmissions across the frequency spectrum without proportionally increasing system complexity.
2Productivity
If resource allocation information is included in the PHY preamble, then transmission efficiency is improved, but frame structure complexity increases
Solution Approach 1:
The patent merges the resource allocation information with the existing PHY preamble structure by embedding the Resource Allocation field within the SIG-C portion of the preamble. This integration allows receiving stations to obtain resource allocation details during the standard preamble processing phase without requiring separate signaling mechanisms, thereby improving transmission efficiency while avoiding significant increases in frame structure complexity.
Solution Approach 2:
The PHY preamble structure is designed to serve multiple functions simultaneously: it provides synchronization information, channel estimation data, and resource allocation details all in one unified structure. The SIG-C field within the preamble universally carries both traditional signaling information and the new resource allocation information, eliminating the need for separate dedicated fields and reducing overall frame structure complexity.
Data Source
AI summary
Disclosed is an uplink (UL) multi-user (MU) transmission method of a station (STA) in a wireless LAN (WLAN) system. An UL MU transmission method of an STA in a WLAN system according to an embodiment of the present invention includes receiving a trigger frame including resource unit allocation information for orthogonal frequency division multiple access (OFDMA) transmission, sending an UL MU physical protocol data unit (PPDU) based on the resource unit allocation information, and receiving an ACK frame for the UL MU PPDU.