UL MU Trigger Frame Typing for Contention-Free Management Uplink
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Solution Overview
Problem
Efficient multi-user management frame exchange is challenging in wireless communication systems, particularly in the uplink direction, due to frame contention and lack of specific frame type specification in existing Trigger frames, leading to delays and inefficiencies.
Innovation Solution
The introduction of a Trigger Frame with a common information field indicating trigger types and a TF Timeout field to manage resource allocation and frame type specification, ensuring timely and efficient multi-user management frame exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If basic Trigger Frame is used to solicit response frames from multiple STAs, then resource allocation for uplink transmission is achieved, but frame contention and delays occur due to lack of specific frame type specification
Solution Approach 1:
The Trigger Frame is segmented into different types (first trigger type for basic response frames, second trigger type for specific management frames) through the type subfield in the common information field. This segmentation allows the AP to specifically solicit management frames (e.g., ADDBA Response) from multiple STAs simultaneously, preventing frame contention and reducing exchange delays while maintaining resource allocation efficiency.
2Productivity
If multi-user transmission is implemented in uplink, then spectrum efficiency is improved, but management frame exchange becomes difficult due to frame contention
Solution Approach 1:
The patent implements a feedback mechanism where the AP transmits a Trigger Frame with a type subfield indicating the second trigger type, which specifically solicits management frames (such as ADDBA Response frames) from multiple STAs. The STAs respond with the specified management frames in the uplink multi-user transmission, ensuring reliable and contention-free management frame exchange while maintaining high spectrum efficiency through coordinated resource allocation.
Data Source
AI summary
A transmission apparatus includes a transmitter and a receiver. The transmitter transmits a Trigger Frame for allocating resources for Uplink Multi User (UL MU) transmission, the Trigger Frame comprising a common information field that includes a type subfield indicating one of a plurality of trigger types, wherein the plurality of trigger types includes a first trigger type, a second trigger type and a third trigger type, the first trigger type indicating a basic trigger, the second trigger type indicating multi-user block ack request, and the third trigger type indicating a specific trigger used for soliciting a specific type of UL MU response frame from a plurality of terminal stations. The receiver, responsive to the type subfield indicating the third trigger type, receives the specific type of UL MU response frame from the plurality of terminal station.