Welcome to the Penn wireless and mobile systems page. Our current research involves three main tasks: (1) the design of a new programming paradigm for sensor networks that uses geographic abstractions to simplify programming tasks, (2) analyze and design new metrics for security for sensor networks, and (3) analysis and improvement of performance of 3G wireless networks. Our past work includes research on real-time communications over 802.11. For more information about these projects, use the navigation on the left.