Application Server Session Continuity in IP Multimedia Collaborative Systems
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Solution Overview
Problem
In collaborative sessions within IP Multimedia Systems, the loss of a controller UE leads to forced session termination without continuity options, and existing solutions fail to effectively manage control transfer, especially when controllers change to passive mode or are under different subscriptions.
Innovation Solution
The system introduces user preferences and UE capacity parameters communicated to the Application Server, allowing collaborative decision-making for control transfer and session management, enabling continuity even when the controller is unavailable, and allowing the Application Server to act as an intelligent agent for selecting a new controller or taking over control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the SCC AS releases all Access Legs when controller is lost, then the session termination is forced, but the session continuity cannot be maintained
Solution Approach 1:
The patent introduces an Application Server as an intermediary that mediates between multiple controller UEs and the network. When one controller is lost, the Application Server can facilitate control transfer to another controller UE without forcing session termination. The Application Server monitors controller status and coordinates the handover process, enabling session continuity while reducing dependency on any single controller.
Solution Approach 2:
The system performs preliminary actions by establishing multiple controller UEs in advance within the collaborative session. These controller UEs are pre-configured and registered with the Application Server before any controller loss occurs. When a controller is lost, the pre-established controller UEs can immediately take over control, preventing forced session termination and maintaining service continuity.
2Reliability
If the SCC AS transfers control to another UE when controller is lost, then session continuity may be maintained, but the control transfer mechanism is insufficient for passive-control mode
Solution Approach 1:
The patent implements dynamic control mode switching where controller UEs can transition between active and passive control modes. The Application Server monitors the status and capability of controller UEs, dynamically adjusting control responsibilities. When a controller enters passive-control mode, the system dynamically reassigns control tasks to other active controller UEs, maintaining session continuity and adapting to changing session conditions without forcing termination.
3Reliability
If multiple controller UEs are involved in collaborative session, then control redundancy is improved, but the complexity of controller selection and management increases
Solution Approach 1:
The Application Server implements a feedback mechanism that continuously monitors the status, capability, and performance of multiple controller UEs. Based on this feedback, the Application Server makes informed decisions about control transfer and session management. The feedback loop includes monitoring controller availability, signal quality, and session state, enabling automated controller selection and management without increasing operational complexity for users.
Data Source
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AI summary
A system of managing collaborative session control when controller is lost or changes to passive-control mode in a data communication network comprising of a control-capable terminal device that can generate and send user preferences on successive controller selection and control policy, a master server device that can make control transfer decisions or take over control upon events, a normal terminal device that can process and response to master server queries on control capacity and its willingness to take over control. These apparatus are connected to each other inside one collaborative session, regardless of their subscriptions. A method of control management of the collaborative session without constant enrollment of controller comprises the steps of sending different types of preferences to master server device; making control transfer or handover decision; and interacting with affected terminals.