(BQ) Part 1 book "Mobile networks architecture" has contents: The NGN, the EPS Network (Network architecture, the radio interface, communication management), the IMS network (The SIP, the IMS architecture, communication management)
IMS – the IP Multimedia Subsystem of the 3GPP family of telecommunication standards –
may very well be at the same time the worst and the best kept secret of the telecom world.
“Secret” because it is essentially designed to be invisible – the modern version of the infrastructure
that delivers communication to the world. “Worst kept” because it has dominated
the strategies for communication evolution in the past years, and has thus been very visible,
at least to those in the industry.
IMS Architecture and Concepts Mạng cố định và di động đã trải qua một quá trình chuyển đổi lớn trong 20 năm qua.
Trong thế giới điện thoại di động, thế hệ đầu tiên (1G) hệ thống đã được giới thiệu vào giữa những năm 1980.
Các mạng này cung cấp các dịch vụ cơ bản để nhấn mạnh chính users.The là trên lời nói và
bài phát biểu liên quan đến services.
Chapter 19 gave an overview of the presence service on the Internet, as deﬁned by the IETF. This chapter focuses on the use of the presence service in the IMS. We explore the IMS architecture that supports the presence service and the applicability of presence to the IMS. 3GPP has deﬁned, in 3GPP TS 24.141 , a presence service that runs over IMS, but mostly, 3GPP is just maintaining the speciﬁcation, not actively progressing it.
In Chapter 23, we introduced the basic technologies and architectures developed by the IETF in the conferencing area. In this chapter, we discuss how those technologies are used in the IMS to provide a conferencing service. This chapter is fairly brief because applying the technologies described in Chapter 23 to the IMS architecture is relatively straight-forward.
In Chapter 1 we introduced the circuit-switched and the packet-switched domains and described why we need the IMS to provide rich Internet services. Chapter 2 introduced the players standardizing the IMS and deﬁning its architecture. In this chapter we will describe the history of the circuit-switched and the packet-switched domains.
The IMS supports several end-to-end QoS models (described in 3GPP TS 23.207 ). Terminals can use link-layer resource reservation protocols (e.g., PDP Context Activation), RSVP, or DiffServ codes directly. Networks can use DiffServ or RSVP. The most common model when cellular terminals are involved is to have terminals use link-layer protocols and to have the GGSN map link-layer resource reservation ﬂows to DiffServ codes in the network. As mentioned in Chapter 8, the PCC (Policy and Charging Control) architecture includes QoS control.
Third generation (3G) networks aim to merge two of the most successful paradigms in
communications: cellular networks and the Internet. The IP (Internet Protocol) Multimedia
Subsystem (IMS) is the key element in the 3G architecture that makes it possible to provide
ubiquitous cellular access to all the services that the Internet provides. Picture yourself
accessing your favorite web pages, reading your email, watching a movie, or taking part
in a videoconference wherever you are by simply pulling a 3G hand-held device out of your
pocket. This is the IMS vision....
ìm hiểu về các khán giả dự kiến Nếu bạn muốn thiết kế một kiến trúc hỗ trợ các nhu cầu của công ty và nhu cầu của người sử dụng, bạn đã có để có được tất cả mọi người suy nghĩ về khán giả chính cho quyền trang web ngay từ đầu. Với kiến trúc thông tin,
The Internet Protocol (IP) Multimedia Subsystem, better known as "The IMS", is
based on the specification of the Session Initiation Protocol (SIP) as standardized by
the Internet Engineering Task Force (IETF). But SIP as a Protocol is only one part
of it; the IMS is more than just a protocol. It is an architecture for the convergence of
data, speech and mobile networks and is based on a wide range of protocols, of
which most have been developed by the IETF.
Chapter 17 provided a description of the protocols at the user’s disposal for conﬁguring services on the Internet. We saw that the service conﬁguration architecture assumes an XML document stored on a server. The client retrieves a copy of the XML document, makes changes to it, and sends the delta back to the server. In IMS, the architecture for service conﬁguration architecture is developed around the XML Document Management (XDM) architecture created by the Open Mobile Alliance (OMA) in the XDM  set of speciﬁcations. ...