CSI Application Server Voice Multimedia Service Interworking
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Solution Overview
Problem
Current communication systems face challenges in providing seamless voice and multimedia services between terminals supporting both Circuit Switched (CS) calls and Internet Protocol Multimedia Subsystem (IMS) sessions, particularly when one terminal only uses the IMS session, leading to issues with call quality and service interoperability.
Innovation Solution
A control message exchange method and apparatus that separates voice and multimedia service components from a Session Initiation Protocol (SIP)-based request message, routing the voice call component through the CS domain and the multimedia component through the IMS domain, enabling simultaneous voice and multimedia service setup between CSI and IMS terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a terminal uses IMS session for both voice and multimedia services, then service versatility is improved, but voice call quality deteriorates when interworking with CS terminals
Solution Approach 1:
The patent segments the service request into separate voice call components and multimedia service components. The voice call component is routed through the CS domain to ensure compatibility and quality with CS terminals, while the multimedia component is handled through the IMS domain. This segmentation allows the terminal to maintain high voice quality when communicating with CS terminals while still supporting versatile multimedia services through IMS.
2Reliability
If separate routing paths are established for voice and multimedia services, then voice call quality is improved, but system complexity increases
Solution Approach 1:
The patent introduces a service gateway as an intermediary entity that mediates between the terminal and the network. The service gateway receives service requests from the terminal, separates voice and multimedia components, and routes them through appropriate network domains (CS or IMS). This intermediary approach simplifies the terminal's complexity while ensuring high voice call quality through proper routing, as the gateway handles the complex routing logic centrally.
Data Source
AI summary
A method and apparatus is provided for communication between a first terminal capable of using both a Circuit Switched (CS) call and an Internet Protocol Multimedia Subsystem (IMS) session, and a second terminal capable of using the IMS session, in a communication system supporting a Combined CS call and IMS session (CSI service). If the second terminal sends a Session Initiation Protocol (SIP) request (INVITE) message to originate a voice service or a multimedia service including the voice service with the first terminal, a CSI Application Server (AS) of an IMS domain managing the first terminal separates a voice service-related component included in the request message from a multimedia service-related component, and generates and sends first and second request messages to the first terminal. Upon receipt of first and second response messages corresponding to the first and second request messages from the first terminal, the CSI AS generates a combined response message and sends the combined response message to the second terminal.