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OPNET Technologies OPNET is a registered |
University: Aristotle University of Thessaloniki (AUTh)
Research:The unit of Telecommunication Systems and Networks covers the research area of transceivers and related techniques (coding, multiplexing, modulation, mobile wireless communication techniques etc.). It also covers wired and wireless networks (routing, network administration, access techniques, ISDN architectures, ATM, IP, GEO/non-GEO systems etc.) OPNET has been used within the IST B-BONE (Broadcasting and Multicasting Over Enhanced UMTS Mobile Broadband Networks) project. This tool provided a means for modelling, as well as evaluating enhancements on the existing UMTS architecture. Besides offering a detailed model of the UMTS architecture, OPNET's development tools allows the hassle-free creation of extensions to the base model, speeding up considerably the development cycle. Our work focuses on multiple layers, dealing with issues such as coding, medium access, multicast routing, handovers and resource management. The vision of this work was to upgrade the UMTS architecture, in order to enable broadcast and multicast transfers of multimedia content, with improved efficiency. So far, along with other partners, we have implemented in OPNET an extended version of the UMTS simulator that supports the most important functionalities of the Multicast/Broadcast Multimedia Subsystem (MBMS), both at the CN and UTRAN side. Thus, it is now possible to set mobile users to join in a MBMS Service provided by the BMSC and receive traffic by either Dedicated or Common channels. Additional enhancements on the proposed UMTS specifications were included, that cover either Core Network issues (Diameter and Multiple Content Variants) and Radio Network issues ( Enhanced Handover algorithm, UE Power Counting, Diversity and MIMO). It is also possible to evaluate this system and compare it with the Release 99 UMTS in cases of multicast data delivery.
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