Network Discovery via Low-Power Beacon Frames
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Solution Overview
Problem
Existing network discovery methods in mobile devices consume significant power and airtime, particularly due to the use of high overhead management messages like probe messages and ANQP messages, which reduces system throughput and battery life.
Innovation Solution
Implementing a low-power network such as a neighborhood area network (NAN) or Bluetooth for network discovery, where mobile devices can passively scan for network parameters during designated discovery windows, reducing the need for active channel switching and high-data-rate communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile device uses traditional network discovery method with probe messages and ANQP messages, then network setup can be completed, but power consumption increases and airtime is consumed
Solution Approach 1:
The access point performs network setup information preparation in advance by broadcasting SSID, BSSID, and other network parameters through beacon frames before any mobile device needs to discover the network. This preliminary publication of network information eliminates the need for mobile devices to send probe messages and exchange ANQP messages, thereby reducing power consumption while ensuring reliable network setup.
2Loss of information
If mobile device sends probe messages and ANQP messages for network discovery, then network information can be obtained, but airtime occupancy increases and system throughput decreases
Solution Approach 1:
The patent extracts the network discovery function from the traditional mobile device-initiated process and relocates it to the access point. The access point publishes all necessary network information (SSID, BSSID, security parameters, IP address, etc.) in beacon frames, allowing mobile devices to passively acquire network information without sending any discovery messages. This extraction eliminates airtime occupancy by probe messages and ANQP messages, thereby increasing system throughput while maintaining complete network information acquisition.
3Speed
If mobile device actively scans for networks using high data rate communications, then network discovery is faster, but power consumption and airtime usage increase
Solution Approach 1:
The access point periodically broadcasts beacon frames containing network information at regular intervals (typically every 100 milliseconds). Mobile devices can enter low-power sleep modes between beacon transmissions and wake up to receive beacons, achieving fast network discovery through periodic updates while minimizing power consumption by keeping the radio off during intervals between beacons.
Data Source
AI summary
A method of operation of a mobile device includes tuning a transceiver of the mobile device to communicate using a low-power (e.g., NAN) network and receiving a discovery message via the low-power (e.g., NAN) network. The discovery message indicates one or more network parameters associated with a wireless local area network (WLAN) that is associated with an access point. The method further includes communicating with the access point using the WLAN based on the one or more network parameters.