IMS Remote Session Control for Cross-Device Media Transfer
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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, where media can be established and controlled by separate devices, allowing media flows to be transferred between devices while maintaining session control, creating a virtual device that combines the capabilities of multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If media flow and session control signaling are tied to the same device in traditional IMS sessions, then device simplicity and standard protocol implementation are maintained, but user convenience and device flexibility are limited
Solution Approach 1:
The patent segments the traditional unified IMS session into two independent components: media flow path and session control signaling path. The media flow can be established between any two devices (UE A and remote end), while session control signaling is handled separately by a controlling device (UE B). This segmentation allows media to be delivered to one device while control operations are performed from another device, greatly enhancing user convenience without requiring complex integration at each device level.
Solution Approach 2:
The patent introduces a mediator mechanism where a controlling device (UE B) acts as an intermediary to manage session control signaling for media flows that may be established on different devices. The controlling device receives session control messages from the network and forwards them to the appropriate media receiving device, enabling remote session control without requiring the media device itself to handle complex signaling protocols.
2Adaptability or versatility
If media flow is transferred to another device, then device versatility and user flexibility are improved, but both session control signaling and media flow must be transferred together, limiting independent control
Solution Approach 1:
The patent applies segmentation by separating media flow transfer from session control signaling transfer. When a user wants to transfer media to a different device, only the media flow path needs to be reconfigured, while the session control signaling can remain with the original controlling device or be transferred independently. This allows flexible scenarios where media is transferred without control, or control is transferred without immediate media transfer, enhancing independent session control capability.
3Adaptability or versatility
If mobile and stationary devices are used interchangeably, then system adaptability is improved, but the requirement for both devices to support full IMS session control increases complexity
Solution Approach 1:
The patent implements universality by enabling different device types (mobile and stationary) to play different roles in the same session. A stationary device with better capabilities can serve as the media receiving endpoint, while a mobile device can serve as the controlling device for session management. This multi-functionality approach allows each device to optimize for its strengths without requiring full IMS session control capabilities on every device, reducing overall system complexity while maintaining adaptability.
Data Source
AI summary
A system and method is provided for remote session control of IP Multimedia Subsystem (IMS) sessions. A remote media flow may be established as part of an origination process wherein the controller UE requests that the media flow is established on a remote media UE as part of the origination request. A remote media flow may also be established as part of a termination process wherein the controller UE identified in the termination request identifies a remote media UE on which a remote media is to be established. Embodiments also allow for the session control to be transferred from a first device to a second device, while maintaining one or more media flows on the first device.