SR-VCC Subscription Information Delivery for IMS Services
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Solution Overview
Problem
Current SR-VCC procedures do not effectively enable the use of IMS centralized services during handovers from LTE to CS networks, as subscription information is only available after the handover is completed, limiting the ability to adapt CS access to the IMS environment in real-time.
Innovation Solution
The method involves receiving and transmitting subscription information related to IMS centralized services from the Home Subscriber Server to the Mobility Management Entity and Mobile Switching Center Server during the initial message of a Single Radio Voice Call Continuity procedure, allowing the Mobile Switching Center Server to operate enhanced for IMS centralized services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If subscription information is delivered from HSS to MME only after handover completion, then the handover procedure remains simple, but the Mobile Switching Center Server cannot adapt CS access to IMS environment in real-time
Solution Approach 1:
The patent applies preliminary action by delivering the ICS subscription information from HSS to MME during the initial attachment phase, before the SR-VCC handover procedure begins. This allows the MME to include the subscription information in the initial SR-VCC message to MSS, enabling the MSS to prepare and activate ICS functionality in advance rather than waiting until after handover completion.
2Productivity
If subscription information is transmitted during the initial message of SR-VCC procedure, then IMS centralized services can be activated during handover, but the signaling message complexity increases
Solution Approach 1:
The patent merges the transmission of SR-VCC handover information with the transmission of ICS subscription information by including the subscription information within the initial SR-VCC message from MME to MSS. This consolidation allows both handover signaling and service information delivery to occur simultaneously through a single message exchange, improving service activation speed while minimizing additional signaling overhead.
Data Source
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AI summary
It is disclosed a method (and related apparatus) comprising transmitting, during terminal attachment to evolved packet system and in at least a portion of a diameter command, centralized service-related subscription information; a method (and related apparatus) comprising transmitting, in an initial message of a call continuity procedure, the received centralized service-related subscription information; and a method (and related apparatus) operating according to the centralized service-related subscription information received in the initial message of the call continuity procedure.