MSC Server Video Session Adaptation for Cross-Network Transfer
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Solution Overview
Problem
Current network technologies fail to support video media transmission during multi-session transfers across different network domains, leading to session transfer failures when the target network is incapable of handling video data.
Innovation Solution
A method where an MSC server assesses the target network's capability to transmit video data and requests conversion or release of the second session to a voice session if video data transmission is not supported, with the SCC AS converting or releasing the session accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target network domain is incapable of transmitting video data, then the session transfer fails, but the system attempts to transfer video sessions anyway
Solution Approach 1:
The MSC server performs preliminary assessment of the target network domain's video transmission capability before initiating the session transfer. By checking whether the target network can transmit video data in advance, the system avoids attempting transfers that would fail, thereby improving reliability while adapting to network capabilities
Solution Approach 2:
The system changes the media type parameter of the session from video to voice when the target network cannot support video transmission. This parameter adaptation allows the session to be transferred successfully by matching the session type to the network's capabilities
2Reliability
If the system checks network capability before transfer, then transfer reliability improves, but the transfer process complexity increases
Solution Approach 1:
The MSC server acts as an intermediary between the SCC AS and the target network domain. It assesses the target network's capability and communicates this information back to the SCC AS, which then adjusts the session parameters accordingly. This intermediary approach centralizes the complexity in one component while maintaining a relatively simple overall process
3Adaptability or versatility
If video sessions are converted to voice sessions, then session transferability improves, but service quality deteriorates
Solution Approach 1:
The system converts the limitation of the target network (inability to transmit video) into a benefit by automatically adapting the session type from video to voice. This conversion transforms a potentially failed transfer into a successful one, ensuring service continuity even with reduced media capability
Data Source
AI summary
A multi-session transfer method, a call control device, and a Service Continuity and Continuity Application Server are disclosed. In the embodiments of the present invention, in a multi-session cross-network transfer process, if a second session to be transferred includes video media, a Mobile Switching Center (MSC) server judges capabilities of a current network. If the current network is incapable of transmitting video media, the MSC server sends a request for transferring voice media of the second session to be transferred. The SCC AS receives the transfer request, and converts the second session to be transferred into voice session for transferring or releases the second session to be transferred, and therefore, the problem in the prior art of incapability of transferring the session is avoided, and the cross-network multi-session service transfer is improved.