Partial Session Transfer for Multimedia Continuity
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Solution Overview
Problem
Existing multimedia service continuity methods in wireless communication systems are ineffective when session transfer is performed for only some media components, as they require signaling to be delivered to the IMS layer, leading to unnecessary procedures and reduced efficiency.
Innovation Solution
A partial session transfer procedure is implemented at the IP layer or lower layers, allowing seamless multimedia service continuity without the need for signaling to be transmitted to the IMS layer, thereby reducing unnecessary signaling and procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If session transfer is performed for only some media components using existing multimedia service continuity methods, then signaling must be delivered to the IMS layer, but this leads to unnecessary procedures and reduced efficiency
Solution Approach 1:
The patent segments the session transfer process into two distinct paths: full session transfer (all media components) that uses the IMS layer MMSC AS, and partial session transfer (some media components) that operates at the IP layer without involving the IMS core. This segmentation allows each path to be optimized for its specific use case, improving efficiency for partial transfers while maintaining reliability for full transfers.
Solution Approach 2:
The patent implements partial session transfer where only some media components are transferred at the IP layer without delivering signaling to the IMS layer. This partial action approach allows the system to perform sufficient transfers for continuity needs while avoiding the excessive action of always involving the IMS core, thereby reducing unnecessary procedures and improving efficiency.
2Reliability
If signaling is always delivered to the IMS layer for session transfer, then session continuity is maintained, but unnecessary procedures and time are consumed
Solution Approach 1:
The patent divides session transfer into two reliability paths: full session transfer involving the IMS layer for maximum reliability, and partial session transfer at the IP layer for faster execution. By segmenting based on the transfer scope, the system achieves reliability when needed while minimizing time loss in appropriate scenarios.
Solution Approach 2:
The patent applies partial action by delivering signaling to the IMS layer only when necessary (full session transfer), rather than always delivering it. This selective approach maintains session continuity reliability for critical transfers while avoiding unnecessary time consumption for routine partial transfers that can be handled at the IP layer.
3Productivity
If session transfer is performed for some media components, then service continuity is achieved, but the procedure becomes more complex compared to all-or-nothing transfer
Solution Approach 1:
The patent segments the session transfer procedure into two distinct protocols: a simplified IP layer protocol for partial media component transfers, and a comprehensive IMS layer protocol for full session transfers. This segmentation provides clear procedural guidance for each scenario, reducing overall system complexity despite enabling flexible partial transfers.
Solution Approach 2:
The patent implements partial session transfer with a dedicated simplified procedure for transferring some media components at the IP layer. This partial action approach allows the system to handle selective transfers with a streamlined procedure rather than requiring the complex full IMS layer involvement, thereby improving productivity without proportionally increasing complexity.
Data Source
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AI summary
A session transfer procedure not for all ongoing multimedia components bur for some media components in a wireless communication system and an apparatus for the same are provided. In a partial session transfer procedure, a user equipment establishing a first session to transmit a plurality of media components transmits a partial attach request message to a mobility control entity of a network core. The partial attach request message may be an attach request message whose attach type is set to 'partial handover'. Upon receiving an attach accept message containing information regarding a gateway of the network core from the mobility control entity, a second session is established with the gateway by using the gateway information. After the establishing of the second session, the user equipment does not release the previously established first session. The user equipment transmits partial session transfer information indicating a media component to be transmitted using each of the first session and the second session among the plurality of media components to a counterpart user equipment, and thereafter exchanges multimedia data with the counterpart user equipment through both of the first session and the second session on the basis of the partial session transfer information.