Triggered Single User Transmission Channel Access Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In WLAN systems, the traditional SU trigger scheme often results in inefficient channel repurposing, leading to loss of transmission opportunities and airtime utilization for client devices that fail to initiate data transmission within the Short Interframe Spacing (SIFS) after receiving a trigger frame, due to factors like data unavailability, processing delays, or channel interference.
Innovation Solution
The AP sends a SU trigger frame and waits for a predefined time interval beyond SIFS for the client device to initiate data transmission, repurposing the channel only after this interval has elapsed or upon completion of the data transmission, thereby providing an extended opportunity for successful data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the AP repurposes the channel immediately after SIFS when data transmission is not initiated, then channel utilization is improved, but transmission opportunities for client devices are lost
Solution Approach 1:
The patent implements a dynamic channel access mechanism where the AP extends the waiting period beyond the fixed SIFS interval when a triggered client device fails to initiate data transmission. This dynamic adjustment allows the system to adapt between rapid channel repurposing (when clients are ready) and extended waiting (when clients need more time), resolving the contradiction between channel utilization and transmission opportunity reliability
Solution Approach 2:
The patent changes the time parameter from the fixed SIFS interval to a variable interval that can extend beyond SIFS. By modifying this temporal parameter based on whether the client initiates transmission, the system optimizes both channel utilization (by repurposing quickly when possible) and transmission reliability (by waiting longer when needed)
2Reliability
If the AP waits for extended time beyond SIFS for data transmission, then transmission opportunities are maintained, but channel utilization decreases
Solution Approach 1:
The system dynamically adjusts the waiting time based on real-time conditions. The AP monitors whether the triggered client initiates data transmission within SIFS and only extends the waiting period when necessary, avoiding unnecessary delays that would reduce channel utilization while maintaining transmission opportunities when needed
3Loss of time
If the AP repurposes channel access quickly, then airtime efficiency is improved, but client devices with processing delays lose transmission opportunities
Solution Approach 1:
The patent provides a cushioning extension beyond SIFS as a safety margin for clients that experience processing delays or data unavailability. This预先 prepared extension protects against transmission failures due to timing constraints, cushioning the impact of processing variations while minimizing overall airtime loss
Data Source
AI summary
Examples of triggered single user (SU) transmissions are described. In an example, an access point (AP) may send a SU trigger frame to a client device for initiating a data transmission by the client device. The AP may detect whether the data transmission is initiated within the Short Interframe Spacing (SIFS) after the SU trigger frame is sent. Responsive to detecting that the data transmission is not initiated within the SIFS, the AP waits for the client device to initiate the data transmission within a predefined time interval after the SIFS. Responsive to detecting that the data transmission is not initiated within the predefined time interval, the AP repurposes the channel access after the predefined time interval is elapsed. Responsive to detecting that the data transmission is initiated within the predefined time interval, the AP repurposes channel access after one of an expiration of a maximum transmission opportunity (TXOP) duration and a completion of the data transmission, whichever is earlier.