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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.


Papers
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Proceedings ArticleDOI
A. Vetro1, Huifang Sun
13 May 2001
TL;DR: The purpose of this paper is to provide an overview of the signal processing techniques that will allow mobile users to enjoy a wide range of multimedia services.
Abstract: The purpose of this paper is to provide an overview of the signal processing techniques that will allow mobile users to enjoy a wide range of multimedia services. In the near future, mobile terminals will be equipped with the capability to decode and playback a variety of audio-visual formats. With the increase in number of formats and the presence of various network, terminal and user constraints, media conversion is expected to play a key role in the delivery of content to mobile users. This paper reviews some of the basic technology required for media conversion and provides some discussion about the types of services that could be supported.

47 citations

Proceedings ArticleDOI
02 Apr 2006
TL;DR: This paper proposes to analyze the IMS network based on the SIP signaling delay and predict performance trends of the network, that allow us to choose parameter values optimally, and on a methodology for the design of such networks for optimal performance.
Abstract: The IP multimedia subsystem (IMS) is envisioned as the solution for the next generation multimedia rich communication. Based on an open IP infrastructure, it enables convergence of data, speech, video and mobile network technology. The session initiation protocol (SIP) is the signaling protocol chosen by the 3GPP consortium for IMS. We propose to analyze the IMS network based on the SIP signaling delay and predict performance trends of the network, that allow us to choose parameter values optimally. The paper focuses on the formulation of queuing models for the IMS network and characterization of the SIP server workload, and on a methodology for the design of such networks for optimal performance. Our analysis is based on a careful study of real-life SIP network traffic.

47 citations

Book
15 Jan 1998
TL;DR: 1. Multimedia systems primer, 2. System Design: System Software Trends.
Abstract: 1. Multimedia Systems Primer. 2. Multimedia Systems Requirements. 3. Multimedia Systems Technology: Coding and Compression. 4. Multimedia Systems Technology: I/O and Devices. 5. Multimedia Systems Technology: Networking. 6. Multimedia Systems Architecture. 7. Multimedia Systems Design: Traffic Analysis. 8. Multimedia Systems Design: Buffer Design. 9. Multimedia Systems Design: Traffic Shaping. 10. Multimedia Systems Design: Scheduling. 11. Multimedia Systems Design: Congestion Control. 12. Multimedia: System Design: System Software Trends. Appendix A. Multimedia Systems Technology: Standards. Acronyms. Glossary. Index.

47 citations

Journal ArticleDOI
TL;DR: It is shown that there are considerable differences regarding their supplementary service architectures in H.323 and SIP, and a coexistence of both protocols can be foreseen.
Abstract: One of the major challenges for next-generation IP networks is to provide new, attractive multimedia services. This includes traditional telephony (voice over IP) and the interworking with legacy telephony systems. In addition to the general problems regarding the support of realtime services in the IP network, e.g., quality of service, voice over IP focuses on the control of advanced features such as supplementary services well known from telephony and on the mechanisms for their fast and efficient development and deployment. The two most promising approaches in the area of multimedia over IP are the protocol suites H.323 (ITU-T) and SIP (IETF). Several comparisons of these two protocols have already been published, but comparisons of their service architectures have been rarely addressed. This tutorial describes and compares the service architectures of H.323 and SIP. The basic protocol architectures are explained, followed by an in depth evaluation of the service implementation mechanisms. The analyses focus mainly on the control of telephony supplementary services in H.323 and SIP and are backed up by detailed examples. Although the two protocol architectures are quite similar, it is shown that there are considerable differences regarding their supplementary service architectures. H.323 (together with H.450) has been especially focused on supplementary services, smooth interworking with the PSTN, and interoperability between different implementations. In this respect, it has clear advantages for IP telephony applications. SIP has been designed with a broader scope, providing more generic syntax and semantics regarding feature definition and session description. Since the SIP standards do not describe details of possible application and service features, this bears the danger of interoperability problems, e.g, for supplementary services. SIP offers advantages for non voice over IP services and applications. A coexistence of both protocols can be foreseen, stressing the importance of interworking between them.

47 citations

Patent
09 Sep 2003
TL;DR: In this paper, a method and apparatus for analyzing current voice call quality in an IP network before allowing a new voice call to enter therein is presented, where a parameter is calculated by the circuitry based on this information.
Abstract: A method and apparatus for analyzing current voice call quality in an IP network before allowing a new voice call to enter therein. Circuitry in each gateway between a PSTN and the IP network obtains information from the IP network regarding the quality of voice call traffic being transmitted from one gateway to another gateway. A parameter is calculated by the circuitry based on this information. This parameter is compared to predetermined thresholds to guarantee acceptable quality for a new voice call that is attempting to enter the IP network. The circuitry includes three circuits. A first circuit passes voice call data to the IP network. A second circuit polls the IP network about traffic information transmitted therein. A third circuit processes the polled information to determine whether the voice call data is to be accepted by the IP network.

46 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20235
202219
202124
202050
201971
201881