The existing telephony systems have limitation for sharing multimedia applcation between peer-to-peer connections. Sharing applications among peers such as shared browsing, shared whiteboard, shared real time video, shared streaming music, shared online game require IP multimedia networks. IMS enables applications in both mobile devices (see Note 1) and fixed line (see Note 2) devices to establish peer-to-peer connections.
Traditionlly, the mobile communication system has been divided in three parts: terminals, the radio access network (RAN) and the core network. This approach needs one change when we are talking about IMS-based system. The term "radio access network" should be replaced by "access network" because IMS can be deployed over non-RAN as well (See Note 2).
Note 1
3GPP IMS Architecture
The Third-Generation Partnership Project (3GPP), is the first standard body to define IMS standard by partnership with other standardization bodies.
In 2003, 3GPP finalized the first release of an architecture known as the IP Multimedia Subsystem(IMS) Release 5 (R5). This IMS specification leverages on GPRS capability introduced earlier by 2G GSM specifications within the core network and
on 3G UMTS access in order to introduce the ability to provide multimedia communication services to mobile end users.
Note 2
ETSI TISPAN architecture
IMS architecture was designed specifically for mobile access. Taking as its starting point a 3GPP IMS architecture, the European Telecommunication Standards Institute (ETSI) decided to establish a specific standardization group named TISPAN (Telecom and Internet Services and Protocols for Advanced Networks) to develop a NGN architectural framework larger in scope than IMS. Through TISPAN, ETSI set about
the task of delivering a NGN specification adapted for DSL access by defining the IP connectivity features of the network that were in common with GPRS.
In late 2005, it released an IMS-based architectural framework that was adapted for fixed DSL broadband access (Release 1).
Source:
1. Miikka Poikselka, Georg Mayer, Hisham Kharttabil and Aki Niemi, The IMS: IP Multimedia Concepts and Services in the Mobile Domains, Nokia, Finland, 2004
2. ITU, Trends in Telecommunication Reform 2007
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