Inter-UE Transfer Session Continuity via Context-Aware Control
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Solution Overview
Problem
In IP multimedia subsystems, when transferring control of a collaborative media session between user equipment, the new controller may not be aware of the entire session information, leading to potential issues with session continuity and management.
Innovation Solution
A method where a collaborative session control transfer request is transmitted with ongoing session information, including media flows and device involvement, ensuring the new controller is aware of the entire session before taking control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If session control is transferred from one WTRU to another WTRU without including ongoing session information, then the transfer process is simpler and faster, but the new controller is not aware of the entire collaborative session leading to session continuity issues
Solution Approach 1:
The patent applies preliminary action by including ongoing session information (such as media flow descriptions, device lists, and session state) in the collaborative session control transfer request before the actual control transfer occurs. This ensures the new controller receives complete session context in advance, eliminating session continuity issues while maintaining a streamlined transfer process.
2Loss of information
If ongoing session information is included in the transfer request, then the new controller is aware of the entire session ensuring continuity, but the message size and processing complexity increase
Solution Approach 1:
The patent extracts only the essential ongoing session information needed for continuity (media flow descriptions, device lists, session state) and includes it in the transfer request, rather than transmitting entire session datasets. This selective extraction maintains information completeness while minimizing message size and processing overhead.
3Speed
If the new controller requests session information after taking control, then the transfer process is faster initially, but session management issues may arise due to lack of awareness
Solution Approach 1:
The patent applies preliminary action by proactively including ongoing session information in the transfer request before control transfer, eliminating the need for post-transfer information requests. This ensures both fast control transfer and complete session awareness from the moment the new controller takes over, resolving the contradiction between speed and reliability.
Data Source
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AI summary
A method and apparatus for inter-user equipment (UE) transfer (IUT) of collaborative session control and session information between WTRUs. A collaborative session control transfer request including ongoing session information is transmitted prior to transfer of session control from one WTRU to another WTRU. Ongoing session information may include information regarding media flows and devices involved in the session. A media control transfer response is transmitted in response to the transfer request.