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University: Tampere University of Technology Research: Title: Connection Admission Control for IEEE 802.16e-2005 (mobile WiMAX) Networks The IEEE 802.16 standard, also known by its trade name Worldwide Interoperability for Microwave Access (or WiMAX for short) is regarded as a new-generation broadband wireless access technology because of its capability to support high data rates, high capacity, and a plethora of (multimedia) services with diverse QoS parameters. The IEEE 802.16e-2005 amendment expands further the parameter of possible applications by adding mobility to the existing fix access (with fixed and portable support). Title: Resource Allocation for Time-Varying Traffic Aggregates in MPLS Networks It is known that aggregated traffic in the Internet may experience a high degree of variability. Over the past decade many studies of traffic patterns revealed that traffic aggregates may also experience changes in their statistical characteristics often manifesting non-stationary behavior. Self-similarity, long-range dependence, and non-stationarity are three major underlying reasons for a traffic pattern to experience high variability. In modern QoS-aware networks, such as MPLS, DiffServ, or MPLS/DiffServ, this type of the traffic is still assigned a constant amount of resources. Whatever the underlying reason for high variability, static resource allocation results in ineffective usage of resources when the load is below than expected or inappropriate performance when the load is higher. The objective of this project is to develop a new dynamic resource description and allocation system for traffic patterns experiencing high variability. For this kind of traffic the system is expected to achieve optimal usage of resources while still providing the requested performance metrics. Title: IEEE 802.11 Mesh Mode Performance Evaluation Using OPNET Simulation Tool Wireless Mesh Networks (WMNs) are considered as the most promising technology to provide cheap wireless access in developing areas lacking communications infrastructure. However, a lot of performance issues are still open. During the project work, we develop simulation scenarios of wireless mesh networks based on the IEEE 802.11 standard and test them in OPNET environment. The goal is to examine existing protocols of the MAC, IP, and transport layers and evaluate their performance metrics. Teaching: TLT-2106 Basic Course on Networking TLT-2106 is an undergraduate course that introduces fundamental concepts in the design and implementation of computer communication networks and their protocols. Topics include: layered network architectures, local area networks, Ethernet, IPv4, routing, transport layer protocols, applications, and mobile IP. Homeworks, assignment, and laboratory sessions are essential parts of the course. There are two simulation assignments with pre-configured project files which teach a student the basics of using OPNET IT Guru and Application Characterization Environment (ACE) module. OPNET IT Guru enables students to better understand the core concepts of networking and equips them to effectively troubleshoot and manage real-world network infrastructures. TLT-2706 Network Simulation Techniques TLT-2706 is a graduate course which is devoted to those interested in theoretical and practical aspects of simulation of telecommunications networks and systems for network performance evaluation, optimization, and control. Well-known network simulation packages, including OPNET, are considered. The attention is also paid to simulation of Markov chains that is of major importance in analysis of computer networks and systems. TLT-1606 Design Project in Telecommunications TLT-1606 is an undergraduate course and mainly involves learning in practice how to work in a project and how to manage it. Students also gain useful insight how to write a diploma thesis. At the same time, they deepen their skills in communications engineering. K. Harjula, M. Hilpinen, and A. Salonen. “Investigation on QoS in WiMAX network”. Design project in telecommunications, TLT-1600, April 2009. I. Frej, M. Lounatkari, and P. Mitoraj. “IEEE 802.11 mesh mode performance evaluation using network simulation tool”. Design project in telecommunications, Work in progress. J. Aaltonen, H. Ruuttila, and M. Rautiainen. “IPTV traffic estimation and simulation”. Design project in telecommunications, TLT-1600, April 2007.
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