IP Multimedia Subsystem

About: IP Multimedia Subsystem is a research topic. Over the lifetime, 4398 publications have been published within this topic receiving 43698 citations.

Vehicle-Based Message Control Using Cellular IP

Abstract: Architecture for playing back personal text-based messages such as email and voicemail over a vehicle-based media system. The user can use a cell phone that registers over a cellular network to an IMS (IP multimedia subsystem) to obtain an associated IP address. The personal messages are then converted into audio signals using a remote text-to-voice (TTV) converter and transmitted to the phone based on the IP address. The phone then transmits the audio signals to the vehicle media system for playback using an unlicensed wireless technology (e.g., Bluetooth, Wi-Fi, etc.). Other alternative embodiments include transmitting converted message directly to the media system, via a satellite channel, converting the messages via a TTV converter on the cell phone, and streaming the converted messages to the phone and/or the media system for playback.

Method, system, and apparatus for switching streaming service

Abstract: A method, a system, and an apparatus for switching a streaming service are disclosed herein. The method for switching a streaming service is applied in IP Multimedia Subsystem (IMS) architecture and includes: receiving a switching request that carries an identifier of requested media; and using a before-switching media channel to send switched media content to User Equipment (UE). The streaming service switching method disclosed herein uses the fast switching capability of the real-time streams in the IMS architecture to switch the streaming service, and uses the before-switching media channel to transmit the switched media content in the IMS architecture, thus improving the switching speed, the user experience, and the network capability of controlling the switching.

Support of IP connections over trusted non-3GPP access

Abstract: In an embodiment, there is provided a method for the support of IP connections for a User Equipment UE having access to a 3GPP Core Network CN via at least a trusted non-3GPP Access Network AN that does not support Layer 2 signalling and bearer per IP connection, said method comprising: —providing that traffic carried by an IP connection is tunnelled over said AN, through a Layer-2 tunnel associated with said IP connection.

Inter-Domain QoS Control Mechanism in IMS based Horizontally Converged Networks

Abstract: IP multimedia subsystem standardized by 3GPP has attracted the endorsement of other network technology providers. IMS is the most complete IP-based service control and management overlay (using SIP) that sets up an overlay on the under-laying transport infrastructure and provides the possibility of end to end IP based services. Adopting IMS as the service control overlay in different technologies like WLAN, xDSL and cable allows their operators to share their infrastructure with 3G wireless networks not only in transport level but also in service level. This convergence which is called horizontal convergence is sought in NGN-next generation network architecture. Provisioning end-to-end QoS in such heterogeneous paradigms is a challenging task according to the different strategies of resource reservation over different technologies. In this paper we have defined new architecture to resolve some of the existing problems existing in IMS policy based QoS control model that don't let end-to-end QoS control between different technologies and domains.

Network Layer Scaling: Congestion Control in Multimedia Communication with Heterogeneous Networks and Receivers

Abstract: Because of the admission control schemes in computer networks, in many multimedia communication scenarios it is not possible to get guaranteed quality of service for data transmission along the entire route from sender to receiver. In such cases scaling mechanisms can be used to overcome problems caused by resource congestion. Whenever resource bottlenecks are noticed, the multimedia traffic through these resources will be reduced for a limited time. The scaling scheme described in this paper uses mechanisms in the network layer to enable short delay times between detection of overload and the reduction of multimedia traffic. Network layer scaling allows priority-controlled regulation of multimedia traffic over network resources and adaptive handling of various paths and receivers. The monitoring and scaling strategies in the network layer and a prioritization scheme for multimedia stream packets are described.