GPS Device Wi-Fi Roaming and Credential Caching
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Solution Overview
Problem
Current GPS devices rely on cellular or satellite networks for data transmission, leading to higher operational costs and unreliable connectivity when moving, as they do not efficiently utilize available Wi-Fi networks for seamless roaming and data exchange.
Innovation Solution
A method for a GPS-ready mobile device to search for and connect to 802.11 Wi-Fi networks while moving, using a process that scans for available networks, prioritizes connections based on signal strength and security, and efficiently manages data transfer between the device and a master GPS server, minimizing disconnections and authentication delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS devices use cellular or satellite networks for data transmission, then data can be transmitted reliably, but operational costs increase
Solution Approach 1:
The GPS device is designed to support multiple communication networks (cellular, satellite, and Wi-Fi) for data transmission. The device can automatically select and switch between different network types based on availability, cost considerations, and transmission requirements, making the communication system universal and multi-functional rather than relying on a single network type.
2Loss of energy
If Wi-Fi networks are used for data transmission, then operational costs decrease, but connectivity reliability deteriorates when moving
Solution Approach 1:
The system dynamically adapts to the device's motion state by detecting whether the device is moving or stationary. When moving, the device prioritizes cellular networks for reliable connectivity. When stationary, it switches to Wi-Fi networks to reduce operational costs. This dynamic behavior allows the system to optimize both reliability and cost based on real-time conditions.
3Reliability
If Wi-Fi authentication and negotiation processes are performed, then secure connection is established, but connection time increases
Solution Approach 1:
The system performs preliminary actions by maintaining a cache of previously authenticated Wi-Fi network credentials and connection parameters. When connecting to a known Wi-Fi network, the device can bypass lengthy authentication processes and establish connections quickly using pre-stored credentials, thereby reducing connection establishment time while maintaining security.
4Reliability
If GPS devices are designed for specific cellular or satellite networks, then network compatibility is ensured, but adaptability to other networks decreases
Solution Approach 1:
The GPS device incorporates multiple communication modules and protocols to support cellular networks, satellite networks, and Wi-Fi networks simultaneously. The device includes a network selection module that can identify, evaluate, and connect to different network types based on availability and requirements, making the device universally compatible across multiple network infrastructures.
Data Source
AI summary
A process for detecting and connecting a GPS-enabled device to available in-range wireless local area networks (WLANs), particularly while the device is in motion. Once connected, the GPS enabled device sends and receives data and other information from a web service or software application. The process includes detecting relative movement speed of the GPS device and repeatedly attempts connections with new WLAN access points when in motion, particularly in excess of five miles per hour and/or twenty-five miles per hour.