Wireless Station Channel Switching for Radar Interference
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Solution Overview
Problem
The IEEE 802.11 standards lack a method for selecting operating frequency bands and channels in wireless LANs, leading to interference with other systems like radar systems, resulting in suspended wireless LAN signal transmissions and decreased system performance.
Innovation Solution
A wireless communication system where wireless stations detect interference and switch to pre-calculated 'evacuation channels' notified by a control device, using environmental information to minimize transmission suspension and improve overall system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless LANs operate on unlicensed frequency bands shared with other systems like radar, then frequency band availability is improved, but interference from other systems increases causing transmission suspension
Solution Approach 1:
The control device pre-calculates and notifies evacuation channels to wireless stations before interference occurs. When radar interference is detected on the current operational channel, the wireless station can immediately switch to the pre-notified evacuation channel without delay, maintaining transmission continuity while utilizing the shared unlicensed band.
2Loss of time
If wireless stations switch channels immediately when interference is detected, then transmission suspension duration is reduced, but system complexity increases due to channel management
Solution Approach 1:
A control device acts as an intermediary between wireless stations and the channel environment. The control device collects environmental information, detects interference conditions, pre-calculates suitable evacuation channels, and notifies wireless stations. This centralizes the complex channel management function, reducing individual station complexity while enabling rapid channel switching when interference is detected.
3Productivity
If multiple wireless stations operate simultaneously on shared channels, then system throughput is improved, but interference and collision probability increase
Solution Approach 1:
Wireless stations notify the control device of environmental information including interference conditions. The control device uses this feedback to detect when radar or other external interference is present on the current channel, then pre-calculates and notifies appropriate evacuation channels. This feedback mechanism enables coordinated channel management that maintains high throughput while responding to external interference.
Data Source
AI summary
In a wireless communication system wherein wireless stations transmit on a shared frequency band, each of the wireless station includes means for notifying a control device of environmental information that includes information on interference from outside, and for switching from an operational channel to an evacuation channel notified by the control device when interference from outside is detected on the operational channel, and the control device includes means for calculating an evacuation channel for each wireless station according to a predetermined control procedure based on the environmental information collected from the wireless station, and for notifying the wireless station of the evacuation channel.