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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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Journal ArticleDOI
TL;DR: In this article, the authors investigated the demand for IP telephony by using conjoint analysis and concluded that the key condition for the proliferation of IP telephones is the complete guarantee of quality of service (QoS), including voice quality, number portability, fax usage and emergency access, comparable to or exceeding that of existing POTS.
Abstract: With the recent diffusion of broadband (BB) services, Internet protocol (IP) telephony is expected to spread significantly in Japan. This article investigates the demand for IP telephony by using conjoint analysis. Projecting IP telephony demand also contributes to Japanese info-communication policy discussions. Two points are made. First, IP telephony is still currently considered an optional supplement or an add-on service option of high-speed BB Internet access services in Japan rather than a close substitute of existing plain old telephone service (POTS). At this point, we find little evidence that many households will promptly forsake their fixed line service for IP telephony. Second, we conclude that the key condition for the proliferation of IP telephony is the complete guarantee of quality of service (QoS), including voice quality, number portability, fax usage and emergency access, comparable to or exceeding that of existing POTS.

26 citations

Patent
Dany Sylvain1
21 Jun 2006
TL;DR: In this article, the first session establishment protocol (SIP) protocol is used to establish a virtual circuit through the local access network (LAP) of an IP multimedia subsystem (IMS).
Abstract: The present invention allows different types of communication applications to cooperate with an associated communication client to facilitate communications having a defined quality of service The communication client may establish an authorized virtual circuit having a defined quality of service through a network using a first session establishment protocol on behalf of the communication application Once the authorized virtual circuit is established, the communication application may establish one or more communication sessions, which may support different types of multimedia services, through the virtual connection In one embodiment, the virtual connection extends through the local access network, which may be supported by an IP multimedia subsystem (IMS) The communication client may use the Session Initiation Protocol (SIP) as the first session establishment protocol to establish the virtual circuit through the local access network

26 citations

Patent
29 Jun 2005
TL;DR: In this article, a user equipment (UE) determines whether an IP multimedia subsystem (IMS) service is registered in response to a radio resource control (RRC) connection request.
Abstract: Apparatus and Method for transmitting control message related to a packet call service in an IP multimedia subsystem (IMS) that transmits/receives an IMS control message using a control plane to reduce a delay caused by setting of a user plane in a packet call setup process. A user equipment (UE) determines whether an IMS service is registered in response to a radio resource control (RRC) connection request. The UE sets an SRB_IMS request parameter requiring that the IMS control message be processed through a signaling radio bearer (SRB) depending on whether the IMS service is registered. The UE transmits an RRC connection request message including the SRB_IMS request parameter to a radio network controller (RNC). The UE configures an SRB_IMS entity.

26 citations

Patent
Kiyoshi Toyoda1
09 Sep 2004
TL;DR: In this article, an IP telephones that are maintaining a call receives a TV camera connection request, the IP telephone obtains a URI of an IP TV camera service from a resource record of the opposing terminal.
Abstract: When one of two IP telephones that are maintaining a call receives a TV camera connection request, the IP telephone obtains a URI of an IP TV camera service from a resource record of the opposing terminal. Then, the IP telephone delivers the URI of the IP TV camera service to an IP TV camera adaptor of its own IP telephone in order to make a video communication request. The resource record of the opposing terminal is associated with a telephone number of the opposing IP telephone, the record being obtained by connecting to a DNS server. The IP TV camera adaptor connects a call, via the IP telephone, to an IP TV camera adaptor of the opposing terminal, using the URI of the IP TV camera service of the opposing terminal and performs video image communication.

26 citations

Proceedings ArticleDOI
Arslan Munir1
16 Mar 2008
TL;DR: The delay analysis of SIP-based signaling delay for IMS session establishment in 3rd generation (3G) network and worldwide interoperability for microwave access (WiMax) network for different channel rates is studied.
Abstract: The IP multimedia subsystem (IMS) is standardized by the 3rd generation partnership project (3GPP) and 3GPP2 as a new core network domain to support Internet Protocol (IP) based multimedia services over 3G networks. Session initiation protocol (SIP) which is an application layer signaling protocol is also standardized by 3GPP and 3GPP2 for session establishment, management, and transformation. In this paper, we study the SIP-based signaling delay for IMS session establishment in 3rd generation (3G) network and worldwide interoperability for microwave access (WiMax) network for different channel rates. In our delay analysis, we take into account transmission, processing and queueing delays at network nodes. The delay analysis of SIP based signaling for IMS provides an insight into the efficiency of SIP signaling for IMS.

26 citations


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