SRVCC Capability Detection in Mobile Communication Systems
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Solution Overview
Problem
In mobile communication systems, resources of the Access Transfer Gateway (ATGW) and Access Transfer Control Function (ATCF) are wasted due to the inability to determine whether user equipment (UE) supports the Single Radio Voice Call Continuity (SRVCC) scheme, leading to unnecessary allocation and signaling relay even if the UE does not support SRVCC.
Innovation Solution
The mobile communication system acquires and stores the SRVCC capability of UE during attach and registration processes, allowing the ATGW and ATCF to determine whether to allocate resources and relay signals based on this capability, preventing wastage by excluding unnecessary allocations and relays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ATGW allocates resources for voice communication path without determining UE's SRVCC capability, then voice communication can be established, but resources of ATGW are wasted when UE does not support SRVCC
Solution Approach 1:
The system performs preliminary determination of UE's SRVCC capability during the attach process or location registration process, before establishing voice communication paths. The MME acquires and stores this capability information, allowing ATGW to selectively allocate resources only when SRVCC is supported, preventing resource wastage while ensuring reliable communication setup
2Reliability
If ATCF relays SIP signal without determining UE's SRVCC capability, then call signaling can be processed, but resources of ATCF are wasted when UE does not support SRVCC
Solution Approach 1:
The system performs preliminary determination of UE's SRVCC capability during the registration process with IMS, before call signaling is processed. The ATCF acquires this capability information, allowing it to selectively relay SIP signals only when SRVCC is supported, preventing resource wastage while ensuring reliable signaling processing
Data Source
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AI summary
The characteristic of a mobile communication system according to the present invention is that the mobile communication system includes the steps of: causing an MME in a visitor network of UE#1 to acquire SRVCC capability of the UE#1 and to notify an HSS of the SRVCC capability of the UE#1 in an attach process or location registration process of the UE#1; and causing an ATCF, which controls an ATGW, to acquire the SRVCC capability of the UE#1, in a registration process of the UE#1 with IMS.