Trigger Frame Coordination for WLAN Channel Access
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Solution Overview
Problem
In wireless local area networks (WLANs), the contention-based CSMA mechanism for channel detection leads to conflicts among access points, resulting in decreased network efficiency and transmission performance due to interference and inefficient channel utilization.
Innovation Solution
A data transmission method where a first access point detects an idle channel and sends a trigger frame to co-channel access points to coordinate data transmission after a preset time period, avoiding simultaneous contention and improving channel utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a contention-based CSMA mechanism is used for channel detection, then multiple access points can independently access channels, but conflicts occur among access points leading to decreased network efficiency
Solution Approach 1:
The patent introduces a trigger frame as an intermediary signal between access points. When an AP detects an idle channel, it sends a trigger frame to coordinate with other APs before data transmission. This mediator mechanism enables cooperative channel access while maintaining the independence of each AP's channel detection capability, thereby resolving the contradiction between ease of operation and network efficiency.
2Reliability
If a detection energy threshold is set to avoid conflicts, then channel occupation can be identified, but interference from other channels causes false detection and reduces transmission opportunities
Solution Approach 1:
The patent implements a feedback mechanism where access points exchange trigger frames to communicate channel status information. Instead of relying solely on local energy detection that may be affected by interference, APs receive feedback from each other about actual channel availability. This feedback loop improves detection reliability while avoiding false negatives that would reduce transmission opportunities.
3Adaptability or versatility
If multiple access points contend for the same channel simultaneously, then channel access is distributed, but conflicts occur preventing data transmission
Solution Approach 1:
The patent applies preliminary action by having access points send trigger frames before actual data transmission. This preliminary signaling phase allows APs to coordinate their access intentions in advance, establishing a transmission schedule that prevents conflicts. The distributed access capability is maintained while reliability is improved through this preparatory coordination step.
Data Source
AI summary
This application provides a data transmission method and apparatus. The method includes: A first access point detects a channel. If the first access point detects an idle first channel, the first access point sends a first trigger frame to at least one second access point, where the first trigger frame is used to trigger the at least one second access point to send data on the first channel after a first preset time period elapses. In this way, an existing CSMA channel detection mechanism may be compatible with the method, and a conflict caused by contention of a plurality of APs for a channel at the same time can be avoided, which helps improve network transmission efficiency, and helps improve transmission performance.