Mobile Node Binding Update Table Recovery
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Solution Overview
Problem
Mobile nodes experience prolonged downtime and loss of connectivity when they abruptly shut down in their home network, as corresponding nodes continue to use the invalid care-of address, leading to inaccessible communication sessions for an unacceptable period.
Innovation Solution
A method and system that involve examining a binding update table after recovery to send update messages to identified nodes, removing entries, and updating records to switch back to the home address, ensuring continuous communication by informing nodes that the care-of address is no longer valid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mobile node uses the care-of address for communication while operating in a foreign network, then the mobile node can maintain connectivity while mobile, but upon abrupt shutdown and recovery in the home network, the corresponding nodes continue to use the invalid care-of address causing prolonged downtime
Solution Approach 1:
The mobile node performs preliminary actions by examining the binding update table upon recovery to determine if it is in its home network, and proactively sends update messages to corresponding nodes before they attempt communication, preventing the time loss that would occur if it waited for communication failures
Solution Approach 2:
The mobile node implements feedback by continuously monitoring its network location status through the binding update table and automatically initiating address update communications when detecting it has returned to its home network, ensuring corresponding nodes have current address information
2Reliability
If the mobile node stores binding update information in a persistent binding update table, then the node can recover communication state after shutdown, but the node must actively manage and update this table to prevent using invalid addresses
Solution Approach 1:
The mobile node performs self-service by automatically examining its own binding update table upon recovery, determining its current network location, and initiating necessary update messages to corresponding nodes without requiring external intervention or complex manual management
Solution Approach 2:
The mobile node changes the state parameter of the binding update table by examining whether it is in its home network and selectively updating corresponding nodes based on this condition, transforming the table from a static storage structure to an actively managed communication state indicator
Data Source
AI summary
When a mobile node suffers an abrupt shut down while operating in a foreign network and recovers in its home network, the present invention enables the mobile node to reestablish communication capability, without time delay, with the nodes that had established one or more communication sessions with the mobile node prior to the abrupt shut down. The mobile node of the present invention includes an update module that determines whether additional information needs to be sent to the nodes in communication with the mobile node prior to the mobile node suffering an abrupt shut down. Based on that determination, the update module may provide additional information to such nodes.