Mobile Router Proxy Route Optimization
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Solution Overview
Problem
Current Mobile IP protocols, such as RFC 3775, do not effectively optimize routes between mobile networks and Correspondent Nodes, leading to inefficient packet forwarding, especially when a Mobile Router is involved, as they require routing through a Home Agent, which can be cumbersome and memory-intensive, especially for large numbers of nodes or networks.
Innovation Solution
A Mobile Router acts as a proxy node to initiate a return routability check and establish an optimized route with a Correspondent Node, composing messages like Home Test Init (HOTI) and Care of Test Init (COTI) to enable direct communication between nodes and the Correspondent Node, bypassing the Home Agent for packet forwarding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Mobile IP protocol routes packets through Home Agent for mobile nodes, then mobile nodes can maintain connectivity while roaming, but packet forwarding becomes inefficient and memory-intensive for large numbers of nodes
Solution Approach 1:
The patent segments the mobile network into multiple sub-networks, each with its own sub-network address. The Mobile Router maintains bindings at the sub-network level rather than individual node level, reducing the memory burden while maintaining connectivity for all nodes in the sub-network through the Mobile IP protocol
Solution Approach 2:
The patent introduces a Mobile Router as an intermediary device that manages Mobile IP bindings for multiple nodes. The Mobile Router acts as a proxy that maintains the binding between the sub-network address and the care-of address, eliminating the need for each individual node to maintain separate bindings with the Home Agent
2Adaptability or versatility
If Mobile Router maintains bindings for multiple nodes at Home Agent, then all nodes can be reached while mobile, but memory requirements increase significantly with large numbers of nodes
Solution Approach 1:
The patent merges multiple individual node bindings into a single sub-network level binding. Instead of maintaining separate bindings for each node in the mobile network, the Mobile Router maintains one binding at the sub-network address level, significantly reducing memory consumption while supporting multiple nodes
Solution Approach 2:
The Mobile Router serves as a universal binding management point for all nodes in the sub-network. A single binding at the Mobile Router enables connectivity for multiple nodes simultaneously, making the system scalable to support large numbers of nodes without proportionally increasing memory requirements
Data Source
AI summary
Methods and apparatus for establishing an optimized route between a node and a Correspondent Node are disclosed. In a Mobile Router supporting Mobile IP, the Mobile Router having one or more networks associated therewith, a method of establishing a route between one or more nodes associated with one of the networks of the Mobile Router and a Correspondent Node includes composing a HOTI message on behalf of at least one of the nodes, which is sent from the Mobile Router to a Correspondent Node via a Home Agent supporting the Mobile Router. The Mobile Router sends a COTI message to the Correspondent Node on behalf of the node. The Mobile Router receives a HOT message from the Correspondent Node. It then receives a COT message from the Correspondent Node, thereby enabling a binding between the node(s) and the Correspondent Node to be generated such that data packets transmitted between the node(s) and the Correspondent Node can be routed between the node(s) and the Correspondent Node without being routed via the Home Agent.