Double Chord Lookup Table for Seamless Mobility Routing
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Solution Overview
Problem
Conventional IP addresses, which serve as both identifiers and locators, disrupt communication sessions when terminals move, leading to disconnected sessions and inefficient routing due to the need for address changes.
Innovation Solution
A double chord lookup table system that separates identifiers and location information, allowing for optimal routing path management by updating server locations and sharing management ranges across the network, enabling seamless packet transmission even when terminal addresses change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional IP address is used that combines identifier and locator, then the address structure is simple, but communication sessions are disconnected when terminal location changes
Solution Approach 1:
The patent segments the IP address structure into two separate components: an identifier (such as IMSI or terminal ID) that remains constant for a terminal, and a locator (such as care-of address or location-based address) that changes with terminal position. This segmentation allows the identifier to maintain communication sessions while the locator adapts to location changes, resolving the contradiction between session continuity and address structure simplicity.
Solution Approach 2:
The patent introduces a correspondence table (or binding table) as an intermediary mechanism that stores the mapping between identifiers and locators. This intermediary allows the network to track terminal locations without requiring terminals to change their identifiers, thereby maintaining communication sessions while adapting to location changes. The correspondence table acts as a mediator that decouples the identifier from the locator.
2Adaptability or versatility
If the IP address changes when terminal moves, then the locator function is maintained, but the communication session is disrupted
Solution Approach 1:
By separating the IP address into identifier and locator components, the patent allows the locator to change with terminal position while the identifier remains constant. This segmentation enables location adaptability without disrupting communication sessions, as the identifier portion of the address structure maintains session continuity.
Solution Approach 2:
The patent implements preliminary action by establishing a correspondence table that pre-maps identifiers to locators before communication occurs. When a terminal moves and obtains a new locator, the network can proactively update the correspondence table binding, ensuring that communication sessions remain stable without disruption. This preliminary mapping structure allows the system to adapt to location changes while maintaining session stability.
3Measurement precision
If routing paths are frequently updated due to terminal movement, then location accuracy is maintained, but routing complexity increases
Solution Approach 1:
The correspondence table serves as an intermediary that simplifies routing management by centralizing the mapping between identifiers and current locators. Instead of complex distributed routing updates, the network only needs to update the binding in the correspondence table when a terminal moves. This intermediary mechanism maintains location accuracy while significantly reducing routing management complexity.
Solution Approach 2:
The patent implements self-service by allowing terminals to autonomously obtain locators (such as through mobile IP agent or location services) without requiring complex network-wide routing recalculations. The terminal's movement triggers a locator update that is automatically reflected in the correspondence table, maintaining location accuracy while minimizing network complexity through decentralized, self-managing terminal behavior.
Data Source
AI summary
A server, terminal, and method for supporting mobility in a network are provided. A server includes a storage which stores a double chord lookup table including server search information based on identifiers and location information of terminals on a network, a controller which finds a server for providing an optimal routing path between a receiving terminal and a transmitting terminal for sending a packet to the receiving terminal, using the double chord lookup table, where a trigger including an identifier and location information for identifying the receiving terminal is received from the receiving terminal, and a communicator which reports the location of the found server to the receiving terminal and the transmitting terminal.