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.

Energy‐efficient wireless networking for multimedia applications

Abstract: In this paper we identify the most prominent problems of wireless multimedia networking and present several state-of-the-art solutions with a focus on energy efficiency. Three key problems in networked wireless multimedia systems are: (1) the need to maintain a minimum quality of service over time-varying channels; (2) to operate with limited energy resources; and (3) to operate in a heterogeneous environment. We identify two main principles to solve these problems. The first principle is that energy efficiency should involve all layers of the system. Second, Quality of Service is an essential mechanism for mobile multimedia systems not only to give users an adequate level of service, but also as a tool to achieve an energy-efficient system. Owing to the dynamic wireless environment, adaptability of the system will be a key issue in achieving this.

The PINT Service Protocol: Extensions to SIP and SDP for IP Access to Telephone Call Services

Abstract: This document contains the specification of the PINT Service Protocol 1.0, which defines a protocol for invoking certain telephone services from an IP network. These services include placing basic calls, sending and receiving faxes, and receiving content over the telephone. The protocol is specified as a set of enhancements and additions to the SIP 2.0 and SDP protocols.

A modem with ip support

Abstract: The invention relates to a modem (4) with IP support. It comprises access means for autonomous, simultaneous access to the services of a switched telephony network (3) and to the services of an IP based network (9). The autonomous, simultaneous access is established over a dialled up connection (15) and is provided using the IP protocol.

System, method and device for realizing multimedia service

Abstract: A realization system, method and device for multimedia service are provided. In the realization system for multimedia service, a service middleware receives multimedia service location information updated by users, multimedia service scheduling policy and device maintenance information of a service control proxy and loads them onto a service location register; the service middleware starts up or stops corresponding service control proxy according to device maintenance information of the service control proxy; the service location register authenticates a user multimedia service control request according to multimedia service location information and determines a service control proxy for the user through authentication according to multimedia service scheduling policy; the user multimedia service control request is forwarded to a determined service control proxy; the determined service control proxy provides multimedia service interactive control with an interactive electronic program guide and multimedia service control with a service server. The control flow of multiple multimedia services is unified.

IP multimedia services: analysis of mobile IP and SIP interactions in 3G networks

Abstract: Third-generation cellular networks have been designed to provide a variety of IP data services. Both IPv4 and IPv6 are supported in order to provide future-proof solutions. Mobility is supported through both cellular-specific and IP mechanisms. Mobile IP is becoming a key technology for managing mobility wireless networks. At the same time, the session initiation protocol is the key to realizing and provisioning services in IP-based cellular networks. The need for mobility of future real-time service independent of terminal mobility requires SIP to seamlessly interwork with mobile IP operations. In this article, we investigate the issues related to interworking between SIP and mobile IP, with a focus on IPv6 and the applicability to 3G networks being standardized in 3GPP and 3GPP2.