Mobile Node Home Agent Discovery via Location Hints

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Solution Overview

Problem

Mobile nodes face disruptions in session continuity when changing mobility management schemes, as they need to discover and register with the correct home agent quickly to maintain service integrity, especially during handovers where predictive discovery is not possible, and there is a risk of off-path attacks if incorrect home agents are identified.

Innovation Solution

The mobile node provides information about its previous locations to the network during the home agent discovery process, allowing the home agent or home agent discovery server to return hints that help identify the correct serving home agent, which may include redirection information to derive a valid address, such as an anycast or unicast address, enabling seamless session continuity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the mobile node changes its mobility management scheme, then the mobile node can adapt to different network environments, but the session continuity is disrupted and service interruptions occur

Engineering Contradiction:

Improvemobility management scheme adaptabilityVSAvoidsession continuity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The mobile node performs predictive home agent discovery before the actual mobility management scheme change occurs. By proactively identifying the target home agent in advance using location information from the new access network, the system prepares the session continuity mechanism beforehand, eliminating service interruptions when the scheme change occurs.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention introduces a predictive home agent discovery mechanism that acts as an intermediary between the mobile node and the home agents. This intermediary process uses location information to identify the correct home agent before the mobility management scheme change, ensuring seamless session continuity without direct disruption to the ongoing session.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the mobile node performs predictive home agent discovery, then session continuity is maintained, but the home agent discovery process becomes more complex

Engineering Contradiction:

Improvesession continuityVSAvoidhome agent discovery process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The complexity of home agent discovery is concentrated in a preliminary phase before the mobility management scheme change. The mobile node uses available location information from the new access network to predict and identify the target home agent in advance, simplifying the overall process by performing the complex discovery operation only once before the actual transition.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention changes the parameter of home agent discovery timing from reactive (after scheme change) to predictive (before scheme change). By altering when the discovery process occurs, the system maintains session continuity while managing complexity through proactive identification using location parameters from the new access network.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If the mobile node quickly identifies the correct home agent, then service interruptions are reduced, but the risk of off-path attacks increases if incorrect home agents are identified

Engineering Contradiction:

Improvehome agent identification speedVSAvoidoff-path attack risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The mobile node uses feedback from location information obtained in the new access network to identify the correct home agent. By incorporating actual location data from the new network environment, the system reduces the risk of selecting an incorrect home agent, thereby minimizing off-path attack risks while maintaining fast identification speed.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The predictive home agent discovery performs preliminary identification using location information before the mobility management scheme change. This preliminary action using actual location data from the new access network ensures the correct home agent is identified in advance, reducing both service interruptions and the risk of selecting an incorrect home agent that could be exploited by off-path attacks.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11477634B2Home agent discovery upon changing the mobility management scheme

Publication Date: 2022.10.18 SUN PATENT TRUST

AI summary

The invention relates to a method for discovering a home agent serving a mobile node upon the mobile node changing its mobility management scheme in a packet-switched network and the implementation of such method in a mobile node or home agent. In order to propose a home agent discover scheme that maintains session continuity in a seamless manner upon a mobile node changing its mobility management scheme, a mobile node comprises information on its location prior to changing the mobility management scheme to one of the first signaling messages transmitted upon changing the mobility management scheme (home agent discovery message). The receiving node uses this information to identify the home agent serving the mobile node or to provide a hint to the home agent where the mobile node is registered in a response message to the mobile node.