IMS Remote Session Control for Cross-Device Media Handover
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Solution Overview
Problem
Current IP Multimedia Subsystem (IMS) session systems tie media flow and session control signaling to the same device, limiting user convenience by not allowing media flow to be sent to or controlled by a different device, and restricting the use of mobile and stationary devices interchangeably.
Innovation Solution
Implementing remote session control for IMS sessions, allowing media flow to be transferred and controlled separately from session control signaling, enabling media to be directed to different devices within a single communications session, and supporting multiple media flows with session control signaling directed to one device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If media flow and session control signaling are tied to the same device in traditional IMS sessions, then the system architecture is simple and straightforward, but the system cannot allow media flow to be sent to or controlled by a different device, reducing user convenience and flexibility
Solution Approach 1:
The patent segments the traditional unified IMS session into two independent components: media flow path and session control signaling path. This allows the media flow to be directed to one device while session control remains on another device, achieving flexibility without requiring complete architectural redesign. The segmentation enables independent management of media and control functions.
Solution Approach 2:
The patent introduces an intermediary mechanism (separate signaling paths and protocol extensions) that mediates between the media flow and session control. This intermediary layer allows the two functions to operate independently while maintaining coordination, resolving the contradiction between flexibility and complexity by providing a structured interface for separation.
2Ease of operation
If media flow is transferred to another device, then both session control signaling flow and media flow are transferred to the same device, but this does not allow users to control media via one device while watching on a different device
Solution Approach 1:
The patent applies segmentation by separating the control plane (session control signaling) from the data plane (media flow). This enables the control function to remain on the user's mobile device while media is delivered to a different device such as a television or computer, allowing users to control media playback remotely without transferring control signaling.
Solution Approach 2:
The patent introduces a new dimension of separation by creating independent signaling paths for media control that are distinct from the media flow path. This dimensional separation in the protocol architecture enables control and media to operate on different devices simultaneously, expanding the system's operational flexibility.
3Adaptability or versatility
If stationary IP devices are used with session control on mobile IP devices, then device capabilities are utilized, but it is not convenient to interchangeably use mobile and stationary devices in mid-session
Solution Approach 1:
The patent implements dynamic device role assignment where the same device can switch between controlling media and receiving media based on user needs. The system dynamically adjusts which device performs which function during the session, allowing seamless transitions between mobile and stationary devices without requiring session re-establishment.
Solution Approach 2:
The patent creates a universal session framework where devices can fulfill multiple roles (controller or media receiver) within the same session. This multi-functionality is achieved through protocol extensions that allow any device to assume either role, enabling users to interchangeably use mobile phones, tablets, computers, or televisions for different aspects of media consumption.
Data Source
AI summary
A method and system for remote session control of IP Multimedia Subsystem (IMS) sessions, wherein media is established using one or more devices, and multi-media session/session control for multi-media session is provided by a device which may or may not be the same as the device on which the media is established. A method and system is also provided to transfer media from one device to one or more devices retaining multi-media session/session control on a transferring device.