Gateway Apparatus for Circuit Switched to IMS Interconnection
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Solution Overview
Problem
Current technologies fail to effectively interconnect multimedia services, such as video phone, between a mobile circuit switched network and a mobile IMS network, especially when capability information of terminals differs, preventing integrated services across both networks.
Innovation Solution
A gateway apparatus with a call control unit and conversion unit, including demultiplexing, control and analysis, and packetizing units, that converts and packetizes signals to enable interconnection between mobile circuit switched and IMS networks, using protocols like MEGACO, SIP, and SDP to manage and transmit control, speech, and video signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a gateway is provided to interconnect mobile circuit switched network and mobile IMS network, then interconnection of multimedia services is enabled, but capability information mismatch between terminals connected to different networks prevents successful communication
Solution Approach 1:
The gateway acts as an intermediary between the mobile circuit switched network and the mobile IMS network. It extracts capability information from control signals received from terminals, compares capability parameters between networks, and performs necessary conversions or transcodings to enable successful communication despite capability mismatches between terminals on different networks.
2Reliability
If capability information is extracted and compared between terminals, then communication compatibility can be ensured, but the complexity of the gateway increases
Solution Approach 1:
The gateway extracts only the necessary capability information from control signals received from terminals, rather than processing all possible parameters. This selective extraction approach ensures communication compatibility while avoiding unnecessary complexity in the gateway structure.
Solution Approach 2:
The gateway performs capability comparison and conversion only for specific parameters that differ between networks, rather than uniformly processing all capability information. This localized approach to capability management reduces overall system complexity while maintaining compatibility.
3Adaptability or versatility
If control signals are converted between different protocols (H.245 to MEGACO/SIP/SDP), then inter-network communication is enabled, but the conversion process introduces additional processing time
Solution Approach 1:
The gateway performs capability information extraction and comparison during the call setup phase, before actual media transmission begins. This preliminary capability matching ensures that appropriate conversion parameters are predetermined, reducing processing time during active communication.
Data Source
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AI summary
A gateway apparatus is provided in which multi-media services, such as video phone (TV telephone), employing a network of a mobile circuit switched network or the protocol for mobile circuit switching, and the mobile IMS network, are interconnected, and in which a mobile terminal for circuit switching and a mobile terminal for mobile IMS may be interconnected to implement integrated services as IMS. corresponding communication method and a corresponding program A gateway apparatus (110) that interconnects a mobile circuit switched network (130) and a mobile IMS network (102) to implement the video phone includes a conversion unit. The conversion unit demultiplexes a multiplexed bit stream signal output from a mobile terminal (120) connected to the mobile circuit switched network to take out one or more of a control signal, a compression-encoded speech signal, and a compression-encoded video signal. The conversion unit converts the control signal into one or more of a MEGACO signal, a SIP signal and a SDP signal, while converting the speech signal and the video signal, if necessary. The conversion unit also packetizes the speech signal and the video signal to transmit the resulting packet to the IMS network (Fig.1).