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.

Architecture of IP Multimedia Subsystem

Abstract: IP Multimedia Subsystem (IMS) is standardized network architecture for telecom operators that want to provide mobile and fixed multimedia services. IMS-enabled networks provide access to these services from both IP networks and circuit-switched PSTN/PLMNs. This paper describes the IMS architecture and explains its benefits. It concentrates on the main IMS system components and briefly summarizes their key system functions. However, the IMS is a rapidly evolving standard and modifications to the IMS architecture are envisaged. This paper provides a base for future research and work in this domain.

A method and an apparatus for providing multimedia services in mobile terminal

Abstract: A method and an apparatus provide a service of multimedia data in a mobile terminal. In the method and the apparatus, a package data is generated and stored at a multimedia data providing device. The package data includes an execution condition and a multimedia file corresponding to the execution condition , wherein the multimedia file executes in the mobile terminal when the execution condition is satisfied. When the mobile terminal accesses the multimedia data providing device and requests the multimedia data, the package data including the multimedia data is transmitted to the mobile terminal through communication network. According to the method and the apparatus, the mobile terminal is simply provided various multimedia services.

Message conversion and converting system

Abstract: The invention is designed in message intercommunication between the user ends respectively using the IP multimedia subsystem (IMS) message and the non IP multimedia subsystem, and comprises: when the network side receives the IMS message from the calling party to the called party, if it detects the called party can not receive the IMS message, it converts the IMS message from the calling party into the non IMS message capable of being received by called party and sends it to the called party; when the network side receives the non IMS message from the calling party to the called party, it converts the non IMS message into the IMS message and sends it to the called party.

Active location reporting for emergency call in UMTS IP multimedia subsystem

Abstract: The IP multimedia core network subsystem (IMS) provides multimedia services for Universal Mobile Telecommunications System (UMTS). In IMS, an emergency call is established by an Emergency-Call Session Control Function (ECSCF). The E-CSCF dispatches the call to the nearest public safety answering point (PSAP) according to the location of the caller. After emergency call setup, the caller s location is tracked by the PSAP through Location Polling. This paper investigates the performance of location tracking. Then we propose the active location reporting scheme to improve the performance of location tracking. Our study indicates that the active location reporting scheme may significantly outperform the location polling scheme.

Adaptive SLA-based elasticity management algorithms for a virtualized IP multimedia subsystem

Abstract: The IP Multimedia System (IMS) is an important reference service delivery platform for next generation networks and is considered as a de-facto standard for IP-based multimedia communication services. In its current design, the IMS faces important challenges in terms of scalability and elasticity, and lacks the ability to adaptively manage the network resources and dynamically dimension the network nodes based on load and demand. Network function virtualization and cloud computing are two important concepts that can be leveraged to address those challenges in IMS environments. In this work, we propose two adaptive SLA-based elasticity management algorithms for virtualized IMS environments. Our proposed algorithms use two SLA attributes (the call setup delay and user priority) to dynamically control the CPU resources allocated/de-allocated to virtualized IMS nodes. The aims of our proposed algorithms are: 1) to ensure efficient usage and sharing of CPU resources by various IMS components; 2) to reduce the overall power consumption in virtualized IMS platforms; and 3) to enhance the user experience when using IMS networks. We have tested the proposed algorithms by setting up a virtualized IMS environment using OpenIMS Core and Xen as the hypervisor. The results obtained show that our proposed algorithms meet the SLA constraints, even when subjected to dynamic load, thereby enhancing the overall QoS. We have also compared the proposed algorithms with Xen Server's existing CPU resource scaling governors and the results indicate that our algorithms work better when compared to the existing governors.