IP Mobility Locator Identifier Decoupling
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Solution Overview
Problem
Existing IP mobility solutions face scalability issues and break transport connections when a mobile node changes its topological attachment point, leading to triangular routing and dynamic updates in the global routing system, which causes inefficiencies and disruptions.
Innovation Solution
Introducing a locator identifier space between user and network IP addressing spaces, allowing multiple network addresses to be associated with a mobile node, and using a mapper system to decouple user IP addresses from network IP addresses via locator identifiers, ensuring continuous transport connections and efficient mobility across different network domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the mobile node renumbers its IP address when changing topological attachment point, then the mobile node can be reached at its new location, but the transport connection is broken
Solution Approach 1:
The patent segments the IP addressing space into two distinct parts: a user identifier (UID) that remains constant and a locator identifier (LID) that changes with location. This segmentation allows the mobile node to change its network attachment point without breaking transport connections, as the UID portion of the address remains stable while only the LID portion needs to be updated.
Solution Approach 2:
The patent introduces an intermediary mapping system that maintains the association between the constant UID and the changing LID. This intermediary (the mapping database and resolution mechanism) allows transport connections to remain intact by translating the stable UID into the current LID, preventing connection breaks during mobility events.
2Ease of operation
If tunnels are created from the mobile node's new location back to its original location, then the mobile node can be reached, but triangular routing occurs requiring communication via the home agent
Solution Approach 1:
The patent extracts the location tracking function from the home agent and places it at the network edge where the mobile node actually attaches. By removing the need for home agents and triangular routing, the system simplifies the routing path to a direct route between correspondent node and mobile node, eliminating the unnecessary intermediate hop through the home agent.
Solution Approach 2:
Instead of routing traffic back to the original location (home agent) and then forwarding it to the new location, the patent inverts the approach by directly routing traffic to the current location using the updated LID. This reverses the traditional triangular routing pattern into a direct linear path.
3Ease of operation
If the mobile node announces its prefixes from its new attachment point, then the mobile node can be reached at the new location, but dynamic updates cause scalability problems in the global routing system
Solution Approach 1:
The patent applies local quality by confining prefix announcement and location update activities to local network domains rather than propagating them globally. The LID changes are announced only within the local domain where the mobile node is attached, while the global routing system only needs to know the stable UID, thereby improving scalability by limiting the scope of dynamic updates.
Solution Approach 2:
The patent adds a new dimension to the addressing hierarchy by introducing the LID as a separate layer between the global UID and the local network prefix. This dimensional addition allows location-specific information to be handled locally without affecting global routing tables, thereby improving scalability by separating global and local routing concerns.
4Device complexity
If a single IP address is used for the mobile node, then the addressing is simple, but the mobile node cannot maintain multiple network domains active simultaneously
Solution Approach 1:
The patent makes the UID portion of the address universal and multi-functional, serving as both the global identifier for the mobile node and the stable endpoint for transport connections. This universal UID can be associated with multiple different LIDs simultaneously, enabling the mobile node to maintain connectivity across multiple network domains while preserving addressing simplicity through the consistent UID.
Solution Approach 2:
The patent introduces dynamics by allowing the LID portion of the address to change over time and across different network attachments, while the UID remains static. This dynamic LID enables the mobile node to adapt to different network domains and maintain multiple active connections, with the system automatically managing the mapping between UID and current LID.
Data Source
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Figure 3
AI summary
Network system for communicating between a mobile node and a correspondent node via a first IP edge-IP network-second IP edge connectivity, comprising a user IP addressing space and a network IP addressing space, wherein a locator identifier space is inserted between the user IP and network IP addressing space, wherein the first and second IP edges are associated with first and second locator identifiers, and wherein the system is further arranged for associating a mobile node with one or more IP network addresses and an IP user address decoupled from the one or more IP network addresses via the first locator identifier.