This book presents the architecture of two networks that make up the backbone of the telephone service Vo LTE and video service Vi LTE. The 4G mobile network makes it possible to construct bearers through which IP packets, containing either telephone signals (SIP, SDP) or voice or video media (RTP stream), are transported.
The IMS network performs the processing of the telephone signal to provide Vo LTE and Vi LTE services, including call routing and the provision of additional services. Different procedures are described: the set-up and termination of a session, interconnection with third-party networks, roaming and intra-system handover.
The inter-system handover PS-CS is a special case that occurs when the mobile loses 4G network coverage over the course of a session. The e-SRVCC mechanism enables continuity of the service during the switch of the telephone communication to the 2G or 3G networks. The SMS service for short messages, which is a special telephone service in itself, is provided by two structures, one relying on the IMS network, and a second on the CSFB functionality.
Inhoudsopgave
Chapter 1 : Network architecture
Chapter 2 : Protocols
Chapter 3 : Basic procedures
Chapter 4 : Interconnection
Chapter 5 : Roaming
Chapter 6 : Handover
Chapter 7 : Service centralization and continuity
Chapter 8 : Services profile
Chapter 9 : Small message service
Over de auteur
André Perez is a consultant and teacher in networks and telecommunications. He works with industrialists and operators regarding architecture studies and leads training on the 4G and IMS networks for NEXCOM SYSTEMS.
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