Local Mobility Anchor IP Address Preservation for Mobile Nodes
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Solution Overview
Problem
In the context of PMIPv6, networks struggle to preserve IP addresses for Mobile Nodes (MN) during switching between different interfaces when they lack the ability to determine if the MN can maintain address preservation, leading to service interruptions.
Innovation Solution
A method and system that involve the Local Mobility Anchor (LMA) and Mobile Access Gateways (MAGs) exchanging Proxy Binding Update and Acknowledgement messages to determine if the MN has address preservation ability, allowing the LMA to allocate and preserve the IP address of the original interface during switching, ensuring continuous service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network side cannot acquire the ability of the MN for address preservation, then the network cannot preserve the address for the MN, but service interruptions occur
Solution Approach 1:
The patent applies preliminary action by having the MN proactively send its capability information for address preservation to the network side before the actual switching occurs. This allows the network to prepare and preserve the address in advance, ensuring service continuity during the handover process without interruptions.
2Reliability
If the network preserves the address for the MN during switching, then service continuity is maintained, but the network needs to acquire and process additional capability information
Solution Approach 1:
The patent applies self-service by having the MN autonomously generate and send its capability information for address preservation to the network side. This eliminates the need for the network to actively query or determine the MN's capabilities, reducing network processing complexity while ensuring accurate capability information is available for address preservation.
3Measurement precision
If the MN sends capability information to the network side, then the network can preserve addresses accurately, but additional signaling overhead is introduced
Solution Approach 1:
The patent merges the capability information for address preservation with existing signaling messages that are already part of the PMIPv6 protocol flow. By combining multiple pieces of information into existing message structures rather than creating separate dedicated signaling messages, the patent achieves accurate capability identification while minimizing additional signaling overhead.
Data Source
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AI summary
A method and system for realizing network switching, and a mobile node are provided. The method comprises: a Local Mobility Anchor receives a Proxy Binding Update message from a second mobile access gateway, wherein the Proxy Binding Update message carries identifier information of the mobile node, the IP address of a first interface, and the IP address of the second mobile access gateway (S302); the Local Mobility Anchor checks in the stored Binding Cache Entry whether the identifier information of the mobile node and the IP address of the first interface exist (S304); if the existence is checked, the Local Mobility Anchor continually judges whether the Proxy Care-of-Address in the Binding Cache Entry is the same as the Proxy Care-of-Address in the Proxy Binding Update message (S306); if the judging result is that they are different, the Local Mobility Anchor determines that the connection of the mobile node is a switchable connection, and determines that the mobile node has the ability of address preservation, then sends a Proxy Binding Acknowledgement message which carries the IP address of the first interface to the second mobile access gateway (S308).