WiFi Station Probe Request Coordination
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Solution Overview
Problem
Existing WiFi network discovery mechanisms lead to inefficient channel use due to a large number of probe request/response messages when multiple stations attempt to access a network simultaneously, causing channel occupancy and reducing efficiency.
Innovation Solution
A wireless network discovery method where a station detects the current channel before sending a probe request message and delays or cancels the message if another station's probe request is received on the same channel, reducing the number of probe requests and responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple STAs send probe request messages simultaneously to discover WiFi networks, then network discovery speed is improved, but channel occupancy increases and channel use efficiency decreases
Solution Approach 1:
The patent applies preliminary action by having STAs detect the current channel status before sending probe request messages. This preliminary detection allows the system to identify when another STA is already performing network discovery on the same channel, enabling the second STA to delay or cancel its probe request. This prevents simultaneous transmissions that would cause channel occupancy and efficiency degradation, while still allowing rapid network discovery through coordinated timing.
2Adaptability or versatility
If an STA sends active scan messages to discover networks, then network discovery capability is improved, but the number of probe request and response messages increases
Solution Approach 1:
The patent implements preliminary action by detecting the current channel status before transmitting probe request messages. This allows STAs to identify when other STAs are already conducting network discovery on the same channel, enabling them to delay or cancel their own probe requests. This coordination mechanism maintains comprehensive network discovery capability while significantly reducing the total quantity of probe request and response messages exchanged in the network.
Data Source
AI summary
In a wireless network discovery operation, before a WiFi station sends a network probe request in a WiFi network to request for network information it needs to connect to an access point, it first listens to communications on a current channel of the WiFi network for a preset period of time. When the WiFi station receives on the current channel a network probe request message sent by another WiFi station, it further delays sending the first network probe request by a second time period, in anticipation of some signals from the access point. If during the second time period a network discovery message from the access point, such as a probe response or a beacon message, is detected and that message contains the network information needed, the WiFi station cancels the sending of its probe request. Otherwise, the WiFi station sends its probe request after the second time period expires.