Dynamic Home Agent Selection via Preferred Roaming List
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Solution Overview
Problem
Current mobile station systems lack dynamic selection capabilities for their home agents, leading to suboptimal packet-data communication performance due to fixed home agent choices that can increase latency and network traffic, especially when mobile stations switch between wireless wide area networks.
Innovation Solution
A method where a mobile station dynamically selects its home agent based on its preferred roaming list (PRL), connecting to a conveniently located WWAN and registering with a corresponding home agent, allowing for efficient Mobile-IP communication and periodic updates to optimize network usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a mobile station uses a fixed default PRL with predetermined home agents, then the mobile station can initially connect to networks, but packet-data communication efficiency deteriorates due to increased latency and network traffic when switching between WWANs
Solution Approach 1:
The patent applies dynamics by transitioning from a static default PRL to a dynamic PRL that automatically updates based on the mobile station's current network attachment state. The PRL is modified to include only home agents associated with currently attached WWANs, enabling the mobile station to dynamically adapt its home agent selection to minimize latency and optimize packet-data communication efficiency during network switching.
2Adaptability or versatility
If a mobile station maintains a comprehensive PRL with multiple home agents, then network coverage is extensive, but device complexity increases due to management of multiple home agent associations
Solution Approach 1:
The patent applies segmentation by dividing the comprehensive PRL into network-specific segments. Instead of maintaining a single monolithic PRL with all possible home agents, the system segments the PRL into separate home agent lists for each attached WWAN. This segmentation reduces management complexity by focusing only on relevant home agents for the currently attached network while preserving the ability to connect to multiple networks through the segmented PRL structure.
3Reliability
If the mobile station periodically updates its PRL, then connectivity optimization is achieved, but energy consumption increases due to continuous network scanning and PRL updates
Solution Approach 1:
The patent applies periodic action by implementing timely updates of the PRL rather than continuous updates. The system updates the PRL periodically based on network attachment events, such as when the mobile station attaches to or detaches from a WWAN. This periodic update mechanism optimizes connectivity by ensuring the PRL reflects current network conditions while minimizing energy consumption by avoiding constant scanning and updating of network parameters.
Data Source
AI summary
Methods and systems are provided for dynamic selection by a mobile station of its home agent using its preferred roaming list (PRL). A mobile station maintains a PRL comprising an association between (i) a first set of data identifying a first wireless wide area network (WWAN) and (ii) a first identifier of a first home agent. The mobile station detects a broadcast of the first set of data by the first WWAN. Responsive to detecting the broadcast of the first set of data by the first WWAN, the mobile station connects to the first WWAN. Responsive to connecting to the first WWAN, the mobile station uses the first identifier to register with the first home agent.