Wireless LAN Probe Request Channel Switching and Restoration
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Solution Overview
Problem
Wireless LAN devices face difficulties in detecting other devices using different channels while maintaining connection to stations, as they need to frequently change channels to transmit probe requests, leading to instability in communication.
Innovation Solution
The implementation of a wireless LAN system where devices include programs to transmit probe requests and responses using selected channels, with the ability to restore the original channel within a predetermined period, ensuring continuous communication with stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If the wireless LAN device transmits probe requests by frequently changing channels to detect other devices, then the detection capability is improved, but the communication stability with connected stations deteriorates
Solution Approach 1:
The wireless LAN device dynamically switches channels only when necessary for probe request transmission, then restores to the original channel. This dynamic channel management allows the device to adapt between detection needs and communication stability requirements, resolving the contradiction by making the channel selection flexible rather than fixed or constantly changing.
Solution Approach 2:
The device performs channel switching and probe request transmission periodically within a predetermined period, then returns to the original channel. This periodic approach ensures that detection activities are conducted at regular intervals without continuously disrupting communication with stations, balancing detection capability with communication stability.
2Ease of operation
If the wireless LAN device acts as an access point and communicates with stations, then the communication function is improved, but the ability to detect other wireless LAN devices on different channels deteriorates
Solution Approach 1:
The device segments its operation into distinct phases: communication phase with stations and detection phase for probe requests. During detection phase, it temporarily switches to a station mode to transmit probe requests on different channels, then returns to access point mode for normal communication. This segmentation allows both functions to operate effectively without interfering with each other.
Solution Approach 2:
The probe request transmission acts as an intermediary mechanism that enables detection without requiring the device to permanently change its access point role. By using probe requests as a mediator, the device can gather channel information from other wireless LAN devices while maintaining its primary communication function with stations.
Data Source
AI summary
A wireless LAN system, device, and method, and a medium having a wireless LAN program is provided. Wireless LAN devices are able to wirelessly communicate with each other by using a plurality of channels. A wireless LAN device is provided, including a requesting section and a post-request restoring section. The requesting section transmits a probe request by using a second channel selected from among a plurality of channels that the wireless LAN device can use, the probe request being assigned channel information indicating a first channel that the wireless LAN device currently uses. The post-request restoring section, when the second channel is not identical to the first channel, restores the channel used by the wireless LAN device from the second channel to the first channel within a first predetermined period from start of use of the second channel, after the transmission of the probe request.