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
Papers
More filters
Patent•
31 Oct 2019
TL;DR: In this article, the authors describe protocols for establishing an IP multimedia subsystem session, including a session description protocol, which is used to establish an internet protocol multimedia subsystem sessions for an application.
Abstract: Apparatuses, methods, and systems are disclosed for establishing an IP multimedia subsystem session. One method includes receiving, at a first network entity from a user device, a first session initiation protocol message comprising a session description protocol, wherein the first session initiation protocol message is used to establish an internet protocol multimedia subsystem session for an application. The method includes transmitting, from the first network entity to a second network entity, a first message comprising an internet protocol address and an identifier for the application. The method includes receiving, at the first network entity from the second network entity, a status of a radio access technology of the user device, wherein the status of the radio access technology of the user device is received by the second network entity from a third network entity.
11 citations
11 Jun 2003
TL;DR: This paper presents some aspects of provisioning QoS in the IMS environment based on differentiated services (DiffServ), relatively simple but scalable IP-based QoS technology.
Abstract: IP multimedia subsystem (IMS) is a 3GPP Rel. 5 standardized control domain for multimedia services. The IMS is an application environment that uses the PS domain as a bearer service. In this paper UMTS packet switch domain will be described as IMS packet-based access network. The IMS provides services for any type of IP communication whether it is voice or video telephony, video streaming, instant and multimedia messaging, multimedia gaming or virtual-reality. It is obvious that all of that services, especially real time services require end-to-end QoS support. This paper presents some aspects of provisioning QoS in the IMS environment based on differentiated services (DiffServ), relatively simple but scalable IP-based QoS technology. This requires proper choices of QoS mapping, router configuration, and admission control. The major network elements responsible for providing QoS support (GGSN, PCF, MGW, edge routers) based on DiffServ are also described in the paper.
11 citations
TL;DR: This paper has implemented the WebService/Konnex gateway to enable communication between the HASS and the IP-based services and to enable convergence at the network-technology and user-interface levels.
11 citations
04 Jan 2006
TL;DR: The objective of this paper is to propose an outline for a Push-to-Talk (PTT) system that utilizes a Bluetooth scatternet and the Personal Area Networking (PAN) profile for data communications and is thus fully independent of cellular networks.
Abstract: Push-to-Talk over Cellular (PoC) is an emerging service enabling a walkie-talkie-like service over GPRS. An open standard for PoC has been specified by the Open Mobile Alliance (OMA) [1]. OMA PoC is based on an IP/UDP/RTP protocol stack and a client-server based architecture. Group management, floor control1 etc are administered by PoC servers. The systems exploits the SIP signalling capabilities of the IP Multimedia Subsystem (IMS) [2]. The objective of this paper is to propose an outline for a Push-to-Talk (PTT) system that utilizes a Bluetooth scatternet and the Personal Area Networking (PAN) profile for data communications [3], [4]. The proposed system is thus fully independent of cellular networks. A reasonable range of several hundred meters can be obtained with multihop communications between Bluetooth class 1 devices, whose range is up to 100 m. The proposed outline for Push-to-Talk over Bluetooth (PoB) comprises e.g. methods for group formation, network formation, communication, and floor control. The network formation method, which can be utilized in other applications as well, is based on creating a scatternet among a predefined set of devices and on avoiding loops. This approach enables usage of a simple broadcasting based communication method, in which the devices bridging the piconets into a scatternet act as repeaters.
11 citations
Patent•
08 Oct 2014
TL;DR: An IP Multimedia Subsystem (IMS) Centralized Services (ICS) Interworking Function (IWF) element comprises an i2 interface to an IMS core network, an i3 interface to a Telephony Application Server (TAS), a Mobile Applications Part-G (MAP-G) interface to Mobile Switching Center (MSC) for retrieving subscriber identity, a MAP interface to Home Location Register (HLR) for location management, subscriber management and call handling procedures, and an Sv interface to Mobility Management Entity (MME) for appearing as a Vis
Abstract: An IP Multimedia Subsystem (IMS) Centralized Services (ICS) Interworking Function (IWF) element comprises an i2 interface to an IMS core network, an i3 interface to a Telephony Application Server (TAS), a Mobile Applications Part-G (MAP-G) interface to a Mobile Switching Center (MSC) for retrieving subscriber identity, a MAP interface to a Home Location Register (HLR) for location management, subscriber management and call handling procedures, and an Sv interface to a Mobility Management Entity (MME) for appearing as a Visitor Location Register (VLR).
11 citations