Mobile IP Handover Address Prefix Management
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Solution Overview
Problem
Conventional handover techniques in Mobile IP networks are inefficient, particularly for point-to-point links, as they fail to reduce handover latency effectively and often break the Point-to-Point link model when assigning new care-of addresses.
Innovation Solution
The method involves a previous access router advertising aggregate prefixes to a mobile node, which generates provisional care-of-addresses, and a new access router assigns a unique prefix to formulate a modified care-of-address, allowing efficient handover by treating MAC transport connections as a single link and managing address prefixes efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional handover techniques are used in Mobile IP networks, then mobile nodes can maintain connectivity during movement, but handover latency is high and the Point-to-Point link model is broken
Solution Approach 1:
The patent applies preliminary action by having the mobile node generate a prospective care-of address before actual handover occurs. The previous access router forwards handover messages to the new access router in advance, allowing the new router to prepare routing information beforehand. This reduces handover latency by performing critical setup actions before the mobile node actually moves to the new network.
2Productivity
If conventional handover techniques assign new care-of addresses, then mobile nodes can establish connections on new networks, but address spaces are wasted and efficiency is reduced
Solution Approach 1:
The patent applies universality by making aggregate prefixes applicable to multiple mobile nodes simultaneously. Instead of assigning unique prefixes to each mobile node, the system uses a single aggregate prefix that can serve multiple nodes, thereby conserving address space while maintaining the ability to identify and manage individual node connections through other addressing mechanisms.
3Productivity
If aggregate prefixes are advertised to mobile nodes, then address spaces are conserved and handover efficiency is improved, but compatibility with conventional network standards must be maintained
Solution Approach 1:
The patent applies the intermediary principle by introducing a proxy router advertisement mechanism that mediates between the new access router and the mobile node. The previous access router acts as an intermediary, forwarding handover messages and routing information between the mobile node and the new access router, thereby enabling efficient handover while maintaining compatibility with existing Mobile IP standards.
Data Source
AI summary
Method and system for managing address prefix information associated with handover in network. A fast handover process is achieved for point-to-point communication model. A mobile node send a provisional new care-of-address with an aggregate prefix part to its previous access router, which forwards the address to a new access router. The new access router in response generates a modified new care-of-address with a unique prefix part for the mobile node. Alternatively, the mobile node sends a request to the previous access router for a unique prefix. The request is forwarded from the previous access router to the new access router. The new access router assigns a unique prefix for the mobile node.