Dynamic STI Allocation for CS to PS Multimedia Session Transfer
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Solution Overview
Problem
Non-ICS UE devices are unable to transfer both active and held multimedia sessions from a CS network to a PS network due to the lack of a dynamic STI, limiting service continuity when moving between network types.
Innovation Solution
A method and server architecture that utilize a static STI to initiate the transfer of active sessions and dynamically allocate a dynamic STI for held sessions, enabling the transfer of both active and held CS multimedia sessions from a CS network to a PS network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a non-ICS UE uses only a static STI to initiate session transfer, then the UE can transfer an active CS session, but the UE cannot transfer a held CS session due to lack of dynamic STI
Solution Approach 1:
The patent introduces dynamic STI allocation for held sessions, transforming the static identifier system into a dynamic one. The server allocates a dynamic STI to the held session after the initial active session transfer is completed, enabling the UE to subsequently transfer the held session as well. This resolves the contradiction by making the session transfer capability adaptable to different session states (active and held) without compromising service continuity.
Solution Approach 2:
The server performs preliminary allocation of a dynamic STI to the held session during the active session transfer process. By anticipating the need for held session transfer and preparing the dynamic STI in advance, the system enables complete session transfer capability while maintaining reliable service continuity throughout the process.
2Adaptability or versatility
If the server allocates a dynamic STI to a held session after active session transfer, then both active and held sessions can be transferred, but the session transfer procedure becomes more complex
Solution Approach 1:
The patent segments the session transfer process into distinct phases: first transferring the active session using the static STI, then allocating a dynamic STI to the held session, and finally enabling transfer of the held session. This segmentation allows each phase to be handled with appropriate complexity, resolving the contradiction by organizing the procedure into manageable stages that collectively achieve comprehensive session transfer capability.
Solution Approach 2:
The dynamic STI is allocated to the held session as a preliminary action during the active session transfer process. By preparing the dynamic STI in advance and including it in the transfer response, the system reduces the complexity of subsequent held session transfer, as the UE already possesses the necessary identifier without needing to initiate additional allocation requests.
3Reliability
If a non-ICS UE transfers from CS network to PS network, then service continuity is achieved, but the UE cannot maintain both active and held sessions simultaneously due to STI limitations
Solution Approach 1:
The patent makes the STI system universal by enabling it to handle both active and held sessions through the combination of static and dynamic STIs. The static STI continues to identify the active session while the dynamically allocated STI identifies the held session, allowing the system to maintain multiple session types simultaneously during CS to PS network transfer, thus achieving both service continuity and multi-session support.
Solution Approach 2:
By introducing dynamic STI allocation, the system gains the flexibility to adapt to different session states (active and held) during network transfer. This dynamic capability allows the UE to maintain both types of sessions simultaneously in the PS network, resolving the contradiction between reliable service continuity and adaptable multi-session support.
Data Source
AI summary
The present invention discloses a method, User Equipment (UE), and server for multimedia session transfer, and relates to a mobile communication technology, and in particular, to a technology for transferring multimedia sessions from a Circuit Switched (CS) network to a Packet Switched (PS) network. The method includes: receiving a session transfer request sent by a UE, where the session transfer request carries a static Session Transfer Identifier (STI); executing a procedure for transferring the active CS session according to the CS session transfer request, sending the dynamic STI corresponding to the held CS session to the UE, and receiving the request for transferring the held CS session and executing a procedure for transferring the held CS session. Further, a UE and a server are provided.