Preemptive Direct Link Channel Switching for Wi-Fi
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Solution Overview
Problem
Wireless communication systems face interruptions and latency issues when switching channels due to radar signal interference, leading to disruptions in data transmission and quality of service (QOS) degradation.
Innovation Solution
Implementing preemptive direct link channel switching, where a device establishes a direct link with another device on a new channel before the access point switches, avoiding the non-transmission period and reducing switching latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If devices comply with non-transmission requirement following radar signal detection, then interference with radar is avoided, but data transmission is interrupted
Solution Approach 1:
The patent establishes direct links between devices on the new channel before the access point completes its channel switch. This preliminary action allows data transmission to continue uninterrupted during the transition period when the access point cannot transmit or receive data, thus maintaining transmission reliability while complying with radar avoidance requirements.
2Ease of operation
If access point introduces latency for channel switch notification, then devices in low power mode are notified in time, but data transmission delay increases
Solution Approach 1:
Devices perform direct link establishment on the new channel in advance, before the access point completes the channel switch. This eliminates the need to wait for post-switch notifications and allows immediate resumption of data transmission, significantly reducing the time loss associated with channel switching while still allowing the access point to notify devices in low power mode.
Solution Approach 2:
The patent uses the new channel as an intermediary communication path during the transition period. While the access point is switching channels and cannot communicate, devices can exchange data directly through the pre-established direct link on the new channel, bypassing the access point and eliminating transmission delays.
3Extent of automation
If access point initiates channel switch, then centralized control is maintained, but transmission interruption occurs
Solution Approach 1:
The patent segments the communication path into two independent channels: the control channel where the access point maintains centralized control for channel switch notifications, and the data channel where devices establish direct links for uninterrupted data transmission. This segmentation allows the access point to maintain automation and control while devices independently maintain productive data transmission during the transition.
Data Source
AI summary
A method includes receiving an instruction to cease transmission of frames over a first channel and receiving an indication of a second channel. The instruction and the indication are received at a first device from an access point device via the wireless network. The method includes establishing a direct link with a second device using the second channel.