MU-MIMO Response Frame Scheduling via Preliminary Action
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Solution Overview
Problem
In multi-user multiple input multiple output (MU-MIMO) wireless communication systems, existing methods struggle to effectively exchange request and response frames, particularly in environments where the response frame does not include information on the transmitting station, leading to resource wastage and potential collisions.
Innovation Solution
A method is introduced where a request frame is generated with multi-user information, including identifiers and response frame transmission times, allowing each wireless station to transmit its response frame at a designated time, and a token scheme is used to manage response frame transmission order and failure recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple wireless stations transmit response frames simultaneously after receiving a request frame, then the channel access speed is improved, but collisions between response frames occur and resource wastage increases
Solution Approach 1:
The request frame includes predetermined response frame transmission times for each wireless station before the actual transmission occurs. This preliminary scheduling prevents collisions by ensuring each station transmits at its designated time, resolving the contradiction between fast channel access and transmission reliability.
2Productivity
If response frames are transmitted immediately with short inter-frame space, then the transmission efficiency is improved, but the system cannot handle multiple users effectively
Solution Approach 1:
The response frame transmission process is segmented by assigning different transmission times to different wireless stations within the request frame. This segmentation allows multiple users to be handled efficiently without collisions, resolving the contradiction between transmission efficiency and multi-user support.
Solution Approach 2:
The system transitions from single-user immediate response to multi-user scheduled response by adding a time dimension for each user. The request frame contains multiple response frame transmission times, enabling the system to accommodate multiple users while maintaining high transmission efficiency through coordinated scheduling.
3Device complexity
If the response frame does not include transmitting station information, then the frame structure is simplified, but resource wastage occurs due to inability to manage multi-user responses
Solution Approach 1:
Instead of including transmitting station information in each response frame, the system preliminarily assigns and communicates response frame transmission times in the request frame. This approach simplifies the response frame structure while preventing resource wastage through proactive scheduling of multiple users.
Data Source
AI summary
The present invention relates to a method for efficient transmission of a request frame such as an RTS/CTS frame and a response frame in response to the request frame in a multi-user based wireless communication system. The method of the present invention comprises: a process where wireless terminals transmit a response frame at their own response frame transmission time through a request frame that contains information about a plurality of wireless terminals and information about the response frame transmission time of the respective wireless terminals; a process where the respective wireless terminals transmit a response frame according to a token scheme such that the response frame is transmitted to a final access point; and a process where only a representative wireless terminal selected depending on a given wireless environment receives the response frame.