Proxy Mobile IP Registration Order Reversal

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Solution Overview

Problem

In the proxy mobile IP system, the order reversal of registration notification messages between different Mobile Access Gateways (MAGs) and the home agent leads to communication disruptions when a mobile terminal switches between MAGs, especially when the switching occurs quickly, due to differential propagation delays, which existing solutions fail to accurately address without requiring high synchronization or excessive packet retransmissions.

Innovation Solution

A proxy mobile IP system that includes a mobility anchor with a last registration time recording/management unit to determine the order of registration notification messages by comparing the receipt times of new and previous messages, allowing for timely detection of order reversal and maintaining registration without prioritizing new messages, thus avoiding communication disruptions during rapid MAG switching.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the proxy mobile IP system uses differential propagation delays between MAGs and home agent, then the system allows flexible MAG switching, but the registration notification messages may arrive in reversed order causing communication disruptions

Engineering Contradiction:

ImproveMAG switching flexibilityVSAvoidregistration message order

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The mobility anchor pre-records the receipt times of registration notification messages before processing them. When a new registration notification message arrives, the mobility anchor compares its receipt time with the recorded times of previous messages to determine the correct processing order, preventing order reversal issues while maintaining flexible MAG switching

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The mobility anchor acts as an intermediary between MAGs and the home agent. It introduces a time recording and comparison mechanism that mediates the registration notification messages, ensuring they are processed in the correct chronological order regardless of differential propagation delays from different MAGs

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the system prioritizes new registration notification messages, then processing speed improves, but order reversal occurs during rapid MAG switching

Engineering Contradiction:

Improveregistration processing speedVSAvoidmessage order accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The mobility anchor records the receipt time of each registration notification message as soon as it arrives, before any processing or prioritization occurs. This preliminary time stamping allows subsequent ordering to be based on actual arrival times rather than processing priorities, maintaining both speed and accuracy

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The mobility anchor implements a feedback mechanism where each new registration notification message's receipt time is compared against previously recorded times. This feedback loop ensures that messages are always processed in the correct chronological order, preventing order reversal even during rapid MAG switching

Inventive Principle:

Principle #23Feedback

3Reliability

If high-accuracy synchronization is implemented between MAGs and home agent, then message order is maintained, but system complexity and synchronization overhead increase

Engineering Contradiction:

Improvemessage order consistencyVSAvoidsynchronization mechanism

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Each registration notification message carries its own receipt time information, and the mobility anchor uses this self-contained time data to determine processing order. This self-service approach eliminates the need for complex external synchronization mechanisms between MAGs and the home agent, maintaining reliability while reducing system complexity

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The receipt time is recorded preliminarily and locally at the mobility anchor for each incoming message. This preliminary local recording eliminates the need for continuous high-accuracy synchronization between distributed MAGs and the home agent, reducing synchronization overhead while maintaining message order consistency

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8761085B2Proxy mobile IP system, access gateway and method for determining the order of registration notification messages used therefor

Publication Date: 2014.06.24 NEC CORP

AI summary

In a proxy mobile IP system, a mobility anchor comprises: a proxy mobile IP registration unit effectuating proxy mobile IP registration in proxy mobile IP (Internet Protocol) communication by one or more registration notification messages from an access gateway; and a last registration time recording/management unit effectuating recording and management of time of last registration by the registration notification message. The mobility anchor, on receipt of a new registration notification message, determines, in case a receipt time difference (or a receipt time interval) between the time of receipt of the new registration notification message and a registration notification message recorded last time in the last registration time recording/management unit is within a pre-set period of time, and the access gateway has changed by switching, possibility of order reversal of the new registration notification message and the registration notification message recorded last time.