Intermediary Server for Mobile IP Resource Cleanup
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Solution Overview
Problem
Existing Mobile IP technologies consume network resources inefficiently, leading to 'dangling' resources that impact network capacity and operational costs due to the inability to quickly clear unneeded resources when a mobile node changes its network status.
Innovation Solution
A method involving an intermediary server that sends resource management messages to network elements to de-allocate care-of addresses and clear mobility bindings when a mobile node's connectivity is lost or changes its care-of address, utilizing notification messages and vendor-specific attributes within RADIUS protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Mobile IP is used to allow mobile nodes to remain reachable when moving, then mobile node reachability is improved, but network resource consumption increases due to dangling resources
Solution Approach 1:
The patent implements a feedback mechanism where network elements (NAS, RAN, home agent) notify an intermediary server when a mobile node's care-of address becomes invalid. This feedback loop enables the intermediary server to trigger timely resource cleanup, resolving the contradiction by maintaining reachability through continuous status monitoring while eliminating dangling resources that waste network capacity.
Solution Approach 2:
The patent introduces an intermediary server as a mediator between mobile nodes and network elements. This intermediary coordinates resource management by receiving notifications of invalid care-of addresses and systematically triggering resource cleanup across multiple network elements (NAS, home agent), thereby reducing overall network resource consumption while preserving mobile node reachability functionality.
2Ease of operation
If resources are allocated with designated lifetimes for automatic clearing, then resource management is simplified, but unneeded resources persist longer than necessary impacting network capacity
Solution Approach 1:
The patent applies preliminary action by proactively detecting when a mobile node's care-of address becomes invalid through notifications from network elements, and triggering resource cleanup before the designated lifetime expires. This prevents resources from lingering unnecessarily, thereby maintaining network capacity while keeping resource management automated through pre-configured cleanup triggers.
Solution Approach 2:
The system uses feedback from network elements (NAS, RAN, home agent) that notify the intermediary server when care-of addresses become invalid. This real-time feedback enables dynamic resource cleanup that adapts to actual mobile node status changes, optimizing network capacity utilization while maintaining simplified automated management through the intermediary's coordinated response.
3Productivity
If an intermediary server coordinates resource cleanup across multiple network elements, then resource clearing efficiency is improved, but system complexity increases
Solution Approach 1:
The patent merges resource management functionality into a single intermediary server that coordinates cleanup across multiple network elements (NAS, home agent, RAN). This consolidation improves resource clearing efficiency by centralizing the coordination logic and triggering mechanisms, while the underlying network elements maintain their existing structures, thereby limiting the increase in overall system complexity.
Data Source
AI summary
A mobile node using Mobile IP is served by a network access server (NAS), wherein the NAS has allocated a care-of address for the mobile node and a home agent has a mobility binding that associates the care-of address with the mobile node's home address. When the mobile node's care-of address is no longer valid, an intermediary server receives a notification messages from a first network element (e.g., the NAS or home agent) and sends a resource management message to a second network element (e.g., the home agent or NAS). In response to the resource management message, the second network element clears at least one resource associated with the mobile node. For example, the NAS may de-allocate the care-of address and the home agent may clear the mobility binding.