Multihomed Mobile Node Home Agent Binding Cache
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Solution Overview
Problem
Current mobility management protocols, such as Mobile IPv6, do not allow a multihomed mobile node to simultaneously use a home network and a foreign network for communications, limiting service quality and network capacity utilization.
Innovation Solution
A method where a multihomed mobile node registers its home address or a network node's address in the home network as a care-of address with the home agent, enabling simultaneous use of multiple interfaces and networks by maintaining multiple care-of addresses in the binding cache, and using filter policies to determine data packet routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mobile node uses Mobile IPv6 protocol for mobility management, then the mobile node can be reachable by its home address when away from home, but the mobile node cannot simultaneously use home network and foreign network for communications
Solution Approach 1:
The patent segments the network connectivity function by introducing separate binding cache entries for different care-of addresses (home network CoA and foreign network CoA). This allows the mobile node to maintain independent routing paths for each network interface, enabling simultaneous use of both home and foreign networks without protocol modification.
Solution Approach 2:
The home agent acts as an intermediary that maintains multiple binding cache entries, one for each care-of address. It selectively forwards packets to the appropriate network interface based on the binding cache lookup, enabling the mobile node to simultaneously communicate through both home and foreign networks while maintaining Mobile IPv6 compatibility.
2Adaptability or versatility
If a multihomed mobile node registers its home address as a care-of address with the home agent, then the mobile node can maintain connectivity to both home and foreign networks, but multiple care-of addresses must be maintained in the binding cache
Solution Approach 1:
The binding cache is segmented into multiple independent entries, each associated with a specific care-of address and network interface. This segmentation allows the home agent to independently manage bindings for home network and foreign network connections, simplifying the overall management complexity despite handling multiple addresses.
Solution Approach 2:
The mobile node proactively registers both its home network care-of address and foreign network care-of address with the home agent before simultaneous network usage is required. This preliminary registration establishes the binding cache entries in advance, avoiding complex dynamic management during actual simultaneous network operations.
3Productivity
If filter policies are used to determine data packet routing, then user and network operator preferences can be optimized, but additional routing decision complexity is introduced
Solution Approach 1:
Filter policies change the routing decision parameters by introducing configurable criteria (user preferences, operator policies, application requirements) that modify how packets are routed. This allows flexible optimization of service quality without fundamentally changing the routing architecture, as policies can be adjusted independently of the core Mobile IPv6 protocol.
Data Source
AI summary
The invention relates to a method performed by a home agent serving a mobile node in a home network upon attachment of a mobile node to the home network as well as to the home agent. The invention also relates to a method for enabling simultaneous use of a plurality of interfaces by a mobile node being attached to a home network through one of the plurality of interfaces and to at least one foreign network through at least another interface of the plurality of interfaces. Moreover, the invention provides a mobile node and a proxy acting on behalf of the mobile node. To enable a mobile node to use a home network and at least one foreign network for communications the invention suggests the registration of the mobile node's home address or of a network node's address within its home network as a care-of address in the home network.