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What is Open System Architecture (OSA)

Chapter 36
Encyclopedia of Internet Technologies and Applications
The open system architecture (OSA) describes the service architecture for 3rd generation mobile telecommunications network or universal mobile telecommunication networks (UMTS). OSA Standards are being developed and published by as part of 3rd Generation Partnership Project (3GPP) and ETSI. The OSA APIs are developed by parlay group and is called OSA/Parlay service framework.
Published in Chapter:
IP Multimedia Subsystem (IMS) for Emerging All-IP Networks
Muhammad Sher (Technical University of Berlin, Germany), Fabricio Carvalho de Gouveia (Technical University of Berlin, Germany), and Thomas Magedanz (Technical University of Berlin, Germany)
Copyright: © 2008 |Pages: 8
DOI: 10.4018/978-1-59140-993-9.ch036
Abstract
Today the traditional telecommunication technology is declining because of popularity and increasing demand of Voice over IP (VoIP) due to the reason that deployment, maintenance and operation of data networks based on IP infrastructure are less costly than the voice networks. Consequently, it is straight forward to think relaying all types of communications on data networks rather than maintaining in parallel two network technologies. On the other hand we see today increasing demand of integrated multimedia services, bringing together internet applications with telecommunications. In prospect of these global trends, the mobile communications world has defined within the evolution of cellular systems an all-IP network vision which integrates cellular networks and Internet. This is the IP Multimedia System (IMS) (3GPP, TS 23.228 (2005)), namely overlay architecture for provisioning of multimedia services, such as VoIP and videoconferencing on top of globally emerging 3G broadband packet networks.
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