Inter-UE Transfer of Collaborative Session Control in IMS
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Solution Overview
Problem
In IP multimedia subsystem (IMS) systems, there is a need to effectively perform inter-user equipment (UE) transfer of collaborative session control to prevent unachievable transfers, as current methods lack the ability to determine whether a UE can perform the transfer based on its state or capability information, leading to signaling overhead and failures.
Innovation Solution
A method is introduced where a UE transmits a subscription message to an IMS network element to request notification of other UE information, receives a notification message with service control flags indicating availability or unavailability for collaborative session control, and performs the transfer only if the selected UE is capable, thereby reducing signaling overhead and ensuring successful transfers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a UE attempts transfer of collaborative session control without checking capability information, then the transfer process is simple, but the transfer may fail and cause signaling overhead
Solution Approach 1:
The system performs preliminary capability checking by setting service control flags during UE registration with the IMS network element. This advance preparation allows the controlling UE to query capability information before attempting transfer, ensuring that only UEs with appropriate capabilities are selected as transfer targets, thereby preventing failed transfers and reducing signaling overhead.
2Reliability
If capability information is checked before transfer, then transfer reliability is improved, but the system complexity increases due to additional messaging
Solution Approach 1:
Each UE autonomously declares its capability to receive collaborative session control by setting its own service control flag during registration with the IMS network element. This self-service approach eliminates the need for complex centralized capability management, reducing system complexity while ensuring reliable capability verification before transfer.
3Productivity
If service control flags are used to indicate capability, then capability communication is efficient, but information completeness may be insufficient
Solution Approach 1:
The capability information is segmented into two parts: (1) service control flags set during registration that indicate basic capability to receive collaborative session control, and (2) detailed capability information that can be queried and exchanged during the transfer process. This segmentation allows efficient initial filtering while preserving complete capability information for detailed matching.
Data Source
AI summary
A method for performing an inter-user equipment (UE) transfer (IUT) of a collaborative session. The method according to one embodiment is performed by a UE and includes transmitting a subscription message to a network element for requesting notification of information regarding at least one or more other UEs; receiving a subscription acceptance message in response to the subscription message; and receiving a notification message. The notification message includes the information regarding the at least one or more other UEs and a controller UE capability of controlling the collaborative session. The method according to the embodiment further includes performing a process of transferring control with respect to the collaborative session established with a remote party to a specific UE, which is checked as capable of being a controller UE based on the received information, without transferring the collaborative session to the specific UE.