Information-Aware Traffic Reduction for Wireless Sensor Networks, by Edith Ngai, Uppsala University

24 November, 2009 - 10:08

Date: Dec 1, 13.30-14.15Place: Knuth, SICS

Abstract:Environmental monitoring is one of the most popular applications in wireless sensor networks. Although it is important to obtain a continuous record of the environment, users may be able to gain enough information without receiving every routine sensor measurement. Reducing unnecessary traffic allows better utilization of the network resources. However, it is not easy to decide what and how much traffic to reduce in a dynamically changing environment. In this paper, we study the problem of information-aware traffic reduction for wireless sensor networks. We propose a two-step information-aware traffic reduction algorithm to address this problem. First, we provide a distributed and real-time algorithm for sensors to classify their measurements and report them selectively based on the importance of the information. Then, we propose a bandwidth allocation algorithm to assign the forwarding probabilities of packets which considers both the information provided and the network load. Our algorithm can be implemented and integrated easily with existing routing protocols to maximize the quality of information to the users, though the network traffic is reduced. We evaluate our approach based on the sensing measurements in a real application to demonstrate the quality of information achieved. Simulations are also conducted to evaluate its performance in a larger network.


Short Bio:Edith is currently an Assistant Professor (bitr?ande lektor in Swedish) in Department of Information Technology, Uppsala University, Sweden. She received her B. Eng, M.Phil, and Ph.D. from Department of Computer Science and Engineering, The Chinese University of Hong Kong. She did her post-doc in Department of Electrical and Electronic Engineering, Imperial College London, United Kingdom. Her research interests include wireless sensor networking, mobile computing, network security, QoS routing, and video information processing.Previously, she has conducted research in VIEW Laboratory, CUHK, Hong Kong, Network Modelling Lab, Simon Fraser University, Vancouver, Canada, and Tsinghua National Laboratory for Information Science and Technology, Tsinghua University, Beijing, China, and the Intelligent Systems & Networks (ISN) Group, Imperial College London, United Kingdom. She visited the Networked & Embedded Systems Laboratory (NESL) at UCLA in the summer of 2009.Homepage: