Access Router Tunneling for Mobile Node Handover
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Solution Overview
Problem
Current mobile communication methods, such as Mobile IP, face inefficiencies in handover performance due to tunnel overhead and the need for IP stack changes, leading to increased signaling and packet loss during terminal movement within a network without altering the terminal's configuration.
Innovation Solution
A mobile communication method that involves the second access router receiving connection confirmation packets, acquiring the first access router's address, sending a position update, mapping prefix information on the tunnel, and transferring packets, thereby reducing tunnel reconfiguration signaling and packet loss without changing the mobile node's configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Mobile IP tunnel technology is used to transfer packets to the correct location, then packet delivery is achieved, but tunnel overhead increases and handover performance decreases
Solution Approach 1:
The patent extracts the tunneling function from the terminal and relocates it to the network side (access routers). The terminal no longer needs to create tunnels or manage CoA, instead the network routers establish tunnels to forward packets. This removes the complex tunnel management burden from the terminal while maintaining reliable packet delivery.
Solution Approach 2:
The patent introduces access routers as intermediary devices that manage the tunneling process. Rather than the terminal directly managing tunnels to home agents, the access routers act as intermediaries that establish and maintain tunnels to forward packets, simplifying the terminal's role to basic packet reception and transmission.
2Reliability
If the terminal creates new addresses and registers mappings during movement, then packet routing is corrected, but signaling distance and time increase
Solution Approach 1:
The patent implements preliminary action by having the access router prepare and establish tunnels before the terminal actually needs to move. The network side proactively manages tunnel establishment based on terminal location information, so when movement occurs, the tunnel is already in place or can be quickly established without requiring the terminal to perform complex address creation and registration processes.
3Productivity
If HMIP introduces a mobile anchor point to manage position registration, then handover performance improves, but duplicate tunnel headers are required and network resources decrease
Solution Approach 1:
The patent makes the access router multi-functional by having it perform both routing and tunnel management functions. The access router handles packet forwarding, tunnel establishment, and position management in a single device, eliminating the need for separate mobile anchor points and reducing the number of duplicate tunnel headers required throughout the network.
4Adaptability or versatility
If changes are made to the IP stack of the terminal to actualize movement control requirements, then movement management is achieved, but terminal configuration must be altered
Solution Approach 1:
The patent inverts the conventional approach by moving the complexity from the terminal to the network side. Instead of modifying the terminal's IP stack to support advanced movement management, the network routers are equipped with the necessary tunneling and position management capabilities, allowing the terminal to remain simple and unchanged while still achieving sophisticated movement control.
Data Source
AI summary
A technology is disclosed in which, when a normal mobile node (that does not newly provide a dedicated function) is used, signaling for reconfiguring a tunnel during a mobile node movement is reduced and, furthermore, packet loss is reduced. In the technology, when an MN moves from under the control of an AR2 that is a movement origin to be under the control of an AR3 that is a movement destination, the AR3 receives an NS transmitted from the MN to the AR2. The AR3 that receives the NS destined to the AR2 transmits a “Location Update” to the AR2. The AR2 that receives the “Location Update” uses an MN management table of the relevant MN and creates “Prefix Information” and returns the “Prefix Information” to the AR3. A tunnel is established between access routers of the AR2 and AR3 through use of the “Prefix Information”, and a packet destined to the MN is transferred to the MN via the tunnel.