IMS Handover Management via Address Matching and Deferral

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Solution Overview

Problem

Current handover management systems, specifically in the context of IMS centralized services, do not adequately address the scenario where a user equipment (UE) moves from one MSC Server enhanced for Internet Protocol (IP) Multimedia Subsystem (IMS) Centralized Services (ICS) to another, leading to issues with overlapping registration and de-registration procedures and potential deletion of newly registered contact addresses.

Innovation Solution

A method and apparatus that accept and compare registration and de-registration messages between MSC servers, deferring interactions with network subscriber servers and performing partial interactions based on address matching and capability, ensuring proper handover management by using IP addresses for Session Initiation Protocol (SIP) signaling within contact headers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a UE moves from one MSC Server enhanced for ICS to another MSC Server enhanced for ICS, then handover and service continuity are enabled, but overlapping registration and de-registration procedures occur causing deletion of newly registered contact addresses

Engineering Contradiction:

Improveservice continuityVSAvoidcontact address deletion

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent applies preliminary action by having the target MSC Server send a de-registration request to the home MSC Server before the source MSC Server sends its de-registration request. This ensures that the new contact address is registered before the old one is removed, preventing information loss during handover while maintaining service continuity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback mechanisms where MSC Servers exchange registration and de-registration status information. The home MSC Server receives and processes de-registration requests from target MSC Servers, providing feedback on the current registration state to prevent conflicting operations and ensure proper contact address management during handover

Inventive Principle:

Principle #23Feedback

2Productivity

If de-registration procedures are performed without verifying serving entity capability, then processing speed is improved, but incorrect de-registration operations occur

Engineering Contradiction:

Improveprocessing speedVSAvoidde-registration accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies local quality by making the de-registration acceptance criterion specific to the serving entity's capability. The home MSC Server checks whether the requesting MSC Server is capable of performing de-registration on behalf of the UE before accepting the request. This localized quality check ensures reliability without significantly impacting overall processing speed

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP2297916B1Method, apparatus, system and related computer program product for handover management

Publication Date: 2017.03.29 NOKIA SOLUTIONS & NETWORKS OY

AI summary

It is disclosed a methodcomprisingaccepting, after storage of a registration message comprising first address information received from a first serving entity capable of access technology-independent service control, a de-registration request message comprising second address information identical to the first address information from a second serving entity capable of access technology-independent service control.