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Vol: 50(64) No: 2 / June 2005 Running Adaptive Software Applications over Cellular Data Networks Ioana Sora Department of Computer Science and Engineering, University Politehnica of Timisoara, Bd. V. Parvan 2, Timisoara, Romania, e-mail: ioana.sora@cs.upt.ro Doru Todinca Department of Computer Science and Engineering, University Politehnica of Timisoara, Bd. V. Parvan 2, Timisoara, Romania, e-mail: doru.todinca@cs.upt.ro Dan Cosma Department of Computer Science and Engineering, University Politehnica of Timisoara, Bd. V. Parvan 2, Timisoara, Romania, e-mail: dan.cosma@cs.upt.ro Gabriela Bobu Department of Computer Science and Engineering, University Politehnica of Timisoara, Bd. V. Parvan 2, Timisoara, Romania, e-mail: gabriela.bobu@cs.upt.ro Keywords: automatic component composition, dynamic architecture, cellular data networks, fuzzy logic-based admission control. Abstract This article presents results of a complex research project having the goal to develop and validate a set of techniques and structures enabling adaptive applications and services in communications. We are approaching adaptivity and dynamic reconfiguration at multiple levels: the applications and the software infrastructure from each terminal, and the communication network, here with a focus on cellular data networks. A coherent approach of all these levels is needed in order to define a complete solution. At the level of applications and their software infrastructure, we approach dynamic automatic adaptation by solving the following problems: the decisional problem that handles finding a configuration that fits the current imposed requirements, and the infrastructure problem of dynamically mapping structural changes on the implementation. 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