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IMS, the core architecture of NGN, becomes more and more important in modern telecommunication network. It is the main driving force to promote the evolution of telecommunication technology to "All IP" network. However, it is a big challenge that how to provide carrier grade service on best effort IP network. To solve this problem, SDOs (Standards Development Organizations) have developed...
Session initiation protocol (SIP) has already been accepted as the multimedia control signaling standard in ubiquitous wireless network by IETF and 3GPP etc. However, the handover procedure with SIP suffers from undesirable delay for real-time multimedia applications in WLAN. Moreover, the existing handover management protocols are not sufficient to guarantee handover of VoIP session in WLAN. In this...
This tutorial will introduce the notion of network convergence and next generation networks by looking at the evolution of telecommunication services and Internet services and the related infrastructure. Special emphasis will be placed on describing the principles and architecture of the IP multimedia subsystem (IMS), a common service platform standard defined by IETF, 3GPP, ETSI TISPAN, and Cablelab,...
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