Topic
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 published on a yearly basis
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TL;DR: New functionalities in IPTV over IMS architecture are introduced which optimize satisfaction of the end-user and resource utilization of the operator’s networks and the impact of spatiotemporal dynamics of the video content on the deduced perceptual quality is considered.
Abstract: Heterogeneous communication devices are emerging and changing the way of communication. Innovative multimedia applications are now accessible through these embedded systems. The 3GPP IP Multimedia Subsystem (IMS) provides a basic architecture framework for the Next Generation Network (NGN) supporting the convergence platform for service provisioning in heterogeneous networks. ETSI TISPAN standardization effort focuses on delivering IPTV services on such platform. Nevertheless, IPTV on IMS standardization suffers from a lack of efficient user-centric network management mechanisms as the end-user may consume IPTV service from different access networks, on different mobile devices, at anytime. User's Perceived Quality of Service (PQoS) or Quality of Experience (QoE) of IPTV service may also suffer from wireless access network impairments. This paper introduces new functionalities in IPTV over IMS architecture which optimize satisfaction of the end-user and resource utilization of the operator's networks. A context-sensitive User Profile (UP) model is used to deliver IPTV streams adapted to the user's environment. In order to optimize the operator network usage, the impact of spatiotemporal dynamics of the video content on the deduced perceptual quality is considered. A Multimedia Content Management System (MCMS) is proposed to perform dynamic cross-layer adaptation of the IPTV stream based on PQoS measurements at the end-user side.
18 citations
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16 May 2013TL;DR: In this article, a method for registering a UE with an internet protocol multimedia subsystem (IMS) server for one or more native services and non-native services, wherein the UE comprises a modem processor and an application processor.
Abstract: A method, apparatus, and computer program product for wireless communication are provided. The method generally includes registering a UE with an internet protocol multimedia subsystem (IMS) server for one or more native services and non-native services, wherein the UE comprises a modem processor and an application processor. The IMS server may comprise an RTP stack, wherein a portion of the RTP stack resides on the MP and a portion on the AP. A data packet may be received having an identifier of one of the native or non-native services. The data packet may be received from a WWAN or IWLAN. The data packet may be forwarded to the MP or to the AP based on the identifier. According to aspects, the data packet is forwarded to the MP if the identifier indicates an audio service and to the AP if the data packet indicates a video service.
18 citations
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20 Sep 2011
TL;DR: In this article, a peer-to-peer communication system for IP multimedia subsystem (IMS) functionality is described, where each peer user equipment includes an IMS server, and the peer-peer communications is established independent of network-based IMS servers.
Abstract: Systems and methods for peer-to-peer communication between user equipment using IP multimedia subsystem (IMS) functionality are provided. Each peer user equipment includes an IMS server and the peer-to-peer communication is established independent of network-based IMS servers. A third user equipment that does not include an IMS server can join the peer-to-peer communication using network-based IMS servers.
18 citations
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13 Sep 2012TL;DR: In this paper, a method of media repair in an IMS-based network is described, which includes communicating with IMS network using SIP to setup a download session with a BMSC over a MBMS bearer.
Abstract: Disclosed in some examples is a method of media repair in an IMS based network, the method includes communicating with an IMS network using SIP to setup a download session with a BMSC over a MBMS bearer; responsive to determining that one or more received encoding symbols of media downloaded using the established MBMS bearer cannot be decoded: requesting a file repair procedure from the IMS network component using a SIP re-invite request, the SIP re-invite request including an address of an HTTP repair server indicated by the IMS network component during the MBMS bearer setup; responsive to receiving a SIP acknowledgement indicating that the request was successful, requesting an HTTP connection with the HTTP server to re-download the one or more encoding symbols of the media that could not be decoded; and receiving the one or more encoding symbols from the HTTP server.
18 citations
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11 Jan 2013
TL;DR: This book presents a review of the latest advances in speech and video compression, computer networking protocols, the assessment and monitoring of VoIP quality, and next generation network architectures for multimedia services.
Abstract: This book presents a review of the latest advances in speech and video compression, computer networking protocols, the assessment and monitoring of VoIP quality, and next generation network architectures for multimedia services. The book also concludes with three case studies, each presenting easy-to-follow step-by-step instructions together with challenging hands-on exercises. Features: provides illustrative worked examples and end-of-chapter problems; examines speech and video compression techniques, together with speech and video compression standards; describes the media transport protocols RTP and RTCP, as well as the VoIP signalling protocols SIP and SDP; discusses the concepts of VoIP quality of service and quality of experience; reviews next-generation networks based on the IP multimedia subsystem and mobile VoIP; presents case studies on building a VoIP system based on Asterisk, setting up a mobile VoIP system based on Open IMS and Android mobile, and analysing VoIP protocols and quality.
18 citations