IMS Multimedia Ring Back Tone Service Negotiation
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Solution Overview
Problem
Existing methods for implementing Multimedia Ring Back Tone (MRBT) and Multimedia Caller Identification (MCID) services are not applicable in IP Multimedia Subsystem (IMS) networks, leading to poor user experience.
Innovation Solution
A method and system that utilize a Call Session Control Function (CSCF) to determine subscriber status and negotiate early media sessions for MRBT and MCID services, involving an MRBT or MCID Application Server and Multimedia Resource Server to play multimedia content to users within the IMS network, leveraging Session Initiation Protocol (SIP) for signaling and media negotiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If MRBT and MCID services are implemented using prior art methods designed for Circuit-Switched systems, then the services can be provided in CS networks, but the services become unavailable in IMS networks, restricting user experience
Solution Approach 1:
The patent adapts the MRBT and MCID services for IMS networks by changing the technical parameters and protocols from Circuit-Switched to IP-based SIP signaling. The service implementation is modified to use SIP early media mechanisms and IMS-specific network elements (CSCF, AS, MRS) while maintaining the core service functionality, enabling cross-platform service availability.
Solution Approach 2:
The patent creates a universal service framework that can operate in both CS and IMS networks by implementing IMS-compatible versions of MRBT and MCID services. The solution uses standardized SIP protocols and IMS architecture components that can handle multiple service types, making the service delivery mechanism universally applicable across different network types.
2Adaptability or versatility
If early media negotiation is implemented in IMS for MRBT/MCID services, then service functionality is enhanced, but signaling complexity and negotiation overhead increase
Solution Approach 1:
The patent performs early media negotiation during the call setup phase before the actual voice call begins. By utilizing SIP early media mechanisms (183 Session in Progress response with SDP offer/answer), the MRBT and MCID services are established in advance, allowing multimedia content to be delivered and played back before the main call connection is fully established, thus enhancing functionality without delaying service delivery.
Solution Approach 2:
The patent introduces an Application Server (AS) as an intermediary between the CSCF and the Multimedia Resource Server (MRS) to manage early media negotiation. The AS handles the complex SIP signaling, SDP offer/answer exchanges, and coordination between network elements, thereby reducing the signaling burden on other components and simplifying the overall system complexity while enabling sophisticated multimedia service functionality.
Data Source
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AI summary
A method for implementing the Multimedia Ring Back Tone (MRBT) service and Multimedia Caller Identification (MCID) service is disclosed. The method includes: if the network determines that the calling UE is an MCID service subscriber and determines that the called UE supports the MCID early media, the network negotiates the MCID early media with the called UE, and plays a MCID to the called UE if the negotiation succeeds; if the network determines that the called UE is an MRBT service subscriber and the calling UE supports the MRBT early media, the network negotiates the MRBT early media with the calling UE, and plays an MRBT to the calling UE if the negotiation succeeds. In addition, a system for implementing the MRBT service and MCID service is disclosed. The present invention enables the MRBT service and MCID service in an IP Multimedia Subsystem (IMS) so that users may use the multimedia services in the IMS and have a better experience.