IMS Video Call Switching During E-UTRAN to UTRAN Handover

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Solution Overview

Problem

There is no established scheme for deciding the switching method for video calls when a UE performs a handover from E-UTRAN to UTRAN/GERAN in mobile communication systems, which can result in disconnections or improper bearer management.

Innovation Solution

A mobile communication method that includes a service control network to decide and manage the switching method for video calls by maintaining association information between video and voice bearers, allowing seamless handovers from E-UTRAN to UTRAN/GERAN without disconnection, using standardized ATCF and ATGW components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a handover from E-UTRAN to UTRAN/GERAN is performed without an established switching scheme, then the handover process can be executed, but the video call path may be disconnected or improperly managed

Engineering Contradiction:

Improvevideo call continuityVSAvoidswitching method management

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The service control network decides the switching method for video calls in advance, before the handover occurs. The mobile communication network maintains association information between video and voice bearers beforehand, so that when handover is triggered, the pre-established switching scheme ensures continuous video call without disconnection or improper management

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The service control network acts as an intermediary that decides the switching method, while the mobile communication network maintains the association information between video and voice bearers. This intermediary mechanism coordinates the handover process to ensure video call continuity while managing the complexity of switching decisions

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If association information between video and voice bearers is maintained, then the switching method can be properly decided, but the information management complexity increases

Engineering Contradiction:

Improvebearer managementVSAvoidinformation management

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The association information between video and voice bearers serves multiple functions: it enables the service control network to decide the switching method, allows the mobile communication network to properly manage bearers during handover, and ensures video call continuity. This multi-functional information structure reduces overall system complexity despite the added information management requirements

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS9253437B2Mobile communication method and mobility management node

Publication Date: 2016.02.02 NTT DOCOMO INC

AI summary

To provide a scheme for deciding a switching method for the video call when an UE#1 in video call with an UE#2 is caused to perform handover from an E-UTRAN to a UTRAN/GERAN. A mobile communication method according to the present invention is summarized by including the steps of: deciding the switching method for the video call, when a video bearer and a voice bearer which configure a path for the video call are set, by an IMS; and maintaining information on the decided switching method and association information with which information on the video bearer is in association with information on the voice bearer, by a mobile communication network and an eNB.