Mobile Router Bidirectional Tunnel Bypasses Home Agent
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing mobile IP networks lack optimized and secure routing paths between mobile routers and correspondent nodes, especially when they are outside the same Internet Service Provider, leading to inefficient triangular routing and resource wastage.
Innovation Solution
A mobile router and a correspondent router establish a secure, bidirectional tunnel using a messaging protocol and a route server resource with distinct security relationships, allowing them to optimize routing paths and update their tables for address prefixes, thereby bypassing traditional home agent routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all packets are routed via the home agent as per current Mobile IP specification, then mobility support is maintained, but triangular routing occurs causing data transmission delay and network resource waste
Solution Approach 1:
The patent segments the routing path into two parts: a secure tunnel from the mobile node to the border gateway router (using home agent for authentication), and an optimized direct path from the border gateway router to the correspondent node (bypassing home agent). This segmentation allows the packet to follow different routing rules for different segments, eliminating triangular routing while maintaining mobility support.
Solution Approach 2:
The border gateway router acts as an intermediary that receives packets from the mobile node via the home agent, validates the mobile node's identity, and then forwards packets to the correspondent node through an optimized direct route. This intermediary eliminates the need for packets to traverse the entire path back through the home agent, reducing transmission delay.
2Productivity
If MBG is used to optimize routes within ISP internal network, then routing efficiency improves, but triangular routing remains prevalent when MN or CN are outside prescribed ISP
Solution Approach 1:
The patent makes the border gateway router universal by enabling it to serve multiple functions: it acts as a gateway for mobile nodes within the ISP, maintains security authentication through the home agent, and establishes direct optimized routes to correspondent nodes both within and outside the ISP. This multi-functionality allows the system to handle diverse routing scenarios efficiently.
Solution Approach 2:
The patent adds a new dimension to routing by introducing a direct peer-to-peer connection mechanism between the border gateway router and correspondent nodes, independent of the traditional home agent routing dimension. This new routing dimension allows packets to bypass the home agent for the final leg of the journey, improving efficiency for cross-ISP communications.
3Loss of time
If direct optimized routing is established between mobile router and correspondent router, then data transmission delay is reduced, but security verification and routing table updates are required
Solution Approach 1:
The patent performs preliminary security verification by having the border gateway router authenticate the mobile node's identity before establishing the direct route to the correspondent node. This preliminary action ensures security is established beforehand, and once verified, the direct routing can proceed without repeated security checks, actually reducing overall system complexity.
Solution Approach 2:
The routing optimization process incorporates feedback mechanisms where the border gateway router receives routing information from the correspondent node, validates it against security criteria, and updates its routing table accordingly. This feedback loop ensures that routing decisions are both secure and optimized, managing the complexity through structured information exchange.
Data Source
AI summary
A mobile router and a correspondent router, each configured for routing services for nodes within their routing prefixes associated with their respective routing tables, establish a secure, bidirectional tunnel based on a messaging protocol between each other and a route server resource having a prescribed security relationship with the mobile router and correspondent router. The mobile router sends a query via its home agent to the route server resource to identify the correspondent router serving the correspondent node. The mobile router sends a binding update request, specifying a home address and care-of address for the mobile router, to the correspondent router for establishment of a bidirectional tunnel. The correspondent router, upon validating the home address is reachable via the care-of address, establishes the bidirectional tunnel, and updates its routing tables to specify that prescribed address prefixes are reachable via the mobile router home address.