Interworking Gateway for Circuit Switched and IP Multimedia Sessions

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Solution Overview

Problem

There is a lack of standardized interworking solutions for communication networks operating on different switching principles, particularly in multimedia communications involving high data rates, where circuit switched and packet switched domains need to interoperate effectively without end-to-end session establishment and transcoding support.

Innovation Solution

A method and gateway entity that adapt communication sessions by determining terminal capabilities and renegotiating bandwidth or splitting sessions into sub-sessions to accommodate restricted transmission bandwidths, enabling interworking between domains using multicall/multilink operations in circuit switched and IP-based networks at data rates higher than 64 kbit/s.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If circuit switched and packet switched domains interoperate without standardized solutions, then interoperability can be achieved, but session establishment and transcoding support are insufficient

Engineering Contradiction:

Improveinteroperability between switching domainsVSAvoidsession establishment and transcoding support

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces an interworking entity as an intermediary component that mediates between circuit switched and packet switched domains. This entity handles session establishment, capability negotiation, and transcoding coordination, enabling reliable interoperability without requiring direct compatibility between terminals of different switching principles.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If high data rates are used in multimedia communications, then communication quality is improved, but bandwidth restrictions in circuit switched networks become problematic

Engineering Contradiction:

Improvedata rateVSAvoidbandwidth restriction

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the communication session into multiple sub-sessions or calls, each handling a portion of the total data rate. This allows the system to overcome single-call bandwidth restrictions in circuit switched networks while maintaining high overall data rates through aggregation of multiple segmented flows.

Inventive Principle:

Principle #1Segmentation

3Ease of operation

If terminal capabilities are not considered, then session setup is simplified, but adaptability to different networks is reduced

Engineering Contradiction:

Improvesession setupVSAvoidterminal capability adaptation

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent performs capability determination and network conditions assessment as preliminary actions during session establishment. By evaluating terminal capabilities and network restrictions upfront, the system can pre-plan appropriate session configurations, adaptation strategies, and bandwidth allocations, simplifying the overall setup process while maintaining adaptability.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS7983244B2Interworking between domains of a communication network operated based on different switching principles

Publication Date: 2011.07.19 NOKIA TECHNOLOGIES OY

AI summary

Multimedia calls addressed an increased data rate are disclosed. The multimedia calls use the multicall supplementary service in circuit switched mobile networks and a multilink operation to separate calls for each portion of the total session. The calling entity establishes several calls to the same party. The sending entity splits the data into the separate simultaneous channels/calls. The receiving entity combines the data received from the separate simultaneous calls (multicall, multilink). IP-based multimedia uses one session for each media component. The IP/CS interworking is arranged, if the CS leg uses a multicall/multilink operation.