Anchor Point Fast Handover for Mobile IPv6
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Solution Overview
Problem
In heterogeneous mobile networks with multiple candidate access routers of different access techniques, handover prediction is uncertain due to unforeseeable radio link characteristics and terminal mobility, making fast handover methods unreliable, especially for delay-sensitive multimedia applications.
Innovation Solution
Simultaneous handover preparations are made for multiple candidate access routers by an anchor point device, which provides IP addresses and new care of addresses for each candidate router, allowing the mobile node to prepare for potential handovers to multiple access routers, ensuring readiness and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If fast handover method is used with handover prediction, then handover latency is reduced, but reliability deteriorates in heterogeneous networks with multiple candidate access routers
Solution Approach 1:
The patent applies preliminary action by having the mobile node detect and prepare multiple candidate access routers in advance, storing their information (IP addresses, care-of addresses) before actual handover is needed. This allows the node to quickly switch between pre-identified candidates without waiting for prediction to fail, thus maintaining both low latency and high reliability in heterogeneous networks.
2Device complexity
If single candidate access router is used for handover preparation, then device complexity is reduced, but adaptability deteriorates in heterogeneous environments
Solution Approach 1:
The patent applies universality by enabling the mobile node to maintain multiple care-of addresses corresponding to different access routers simultaneously. The node can store and manage information about multiple candidate access routers (including their IP addresses and care-of addresses) and switch between them based on network conditions, making the handover mechanism adaptable to heterogeneous environments while managing complexity through structured information storage.
Data Source
Figure 1
AI summary
The present invention relates to an improved fast hand over method for the mobile IPVv6. An anchor point device (20) sends information to a mobile node (10) comprising information of multiple candidate access routers. The mobile node sends a request for fast binding update to set candidate access routers (30, 40). The invention also relates to a mobile node (10) adapted to perform the handover method and to an anchor point device (20) adapted to perform the handover method.