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.

4G as a Next Generation Wireless Network

Abstract: User requirements are growing faster than ever and the limitations of the current mobile communication systems have forced the researchers to come up with more advanced and efficient technologies. 4G mobile technology is the next step in this direction. 4G is the next generation of wireless networks that will totally replace 3G networks. It is supposed to provide its customers with better speed and all IP based multimedia services. 4G is all about an integrated, global network that will be able to provide a comprehensive IP solution where voice, data and streamed multimedia can be given to users on an "Anytime, Anywhere" basis. At present we have many technologies each capable of performing functions like supporting voice traffic using voice over IP (VoIP), broadband data access in mobile environment etc., but there is a great need of deploying such technologies that can integrate all these systems into a single unified system. 4G presents a solution of this problem as it is all about seamlessly integrating the terminals, networks and applications. The race to implement 4G is accelerating as well as quite challenging. The aim of this paper is to highlight the benefits, challenges in deployment and scope of 4G technologies.

Accessing IP multimedia subsystem

Abstract: A method and a system for providing access to an IP multimedia subsystem (IMS) for a subscriber roaming in a visited communication network are described. A subscriber equipment determines that a visited network IMS is not accessible and sends a register message for registering to an IMS to a control entity in the home communication network of the subscriber. The control entity recognizes that the register message is received directly from a subscriber equipment, and an access entity for accessing the IMS of the home network is assigned. Then, the control entity sends a message to the subscriber equipment which message comprises the address of the access entity.

Multimedia public communication services distribution method and apparatus with distribution of configuration files

Abstract: An apparatus and method for distributing multimedia services. The apparatus includes a transmitter for transmitting for receipt by at least one device a multimedia configuration file for configuring at least one device to present multimedia services to a user.

Store-and-forward server and method for storing and forwarding for instant messaging service implemented in IP multimedia core network subsystem (IMS)

Abstract: A new functionality is defined for addition to a known multimedia messaging service to enable interfacing with the mobile multimedia architecture as provided by the IP multimedia core network subsystem (IMS) of the Third Generation Partnership Project (3GPP).

Mobile network having ip multimedia subsystem (ims) entities and solutions for providing simplification of operations and compatibility between different ims entities

Abstract: An IP Multimedia Subsystem (IMS) architecture for IP multimedia services is provided with a given user equipment (UE); a gateway support node (GGSN) configured to handle packet transmission to/from the given UE; and a proxy call session control function (P-CSCF) configured to serve as a first contact point of the UE and provide session management services, including establishing a packet data protocol (PDP) context for IMS related signaling, registration, and other procedures for IMS sessions. The P-CSCF is also configured to perform the following: storing identification information from the given UE during registration in memory; receiving a SIP (Session Initiation Protocol) message from the given UE; comparing identity in the SIP message with the identification information stored with a link to a Policy Decision Function (PDF); and using the same PDF for all operations of the given UE, when the identity in the SIP messages matches the identification information stored in memory.