tailieunhanh - Báo cáo hóa học: " Energy-Efficient Medium Access Control Protocols for Wireless Sensor Networks"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Energy-Efficient Medium Access Control Protocols for Wireless Sensor Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 39814 Pages 1-17 DOI WCN 2006 39814 Energy-Efficient Medium Access Control Protocols for Wireless Sensor Networks Qingchun Ren and Qilian Liang Department of Electrical Engineering The University of Texas at Arlington Arlington TX 76019-0016 USA Received 3 November 2005 Revised 14 April 2006 Accepted 2 May 2006 Recommended for Publication by Dongmei Zhao A key challenge for wireless sensor networks is how to extend network lifetime with dynamic power management on energyconstraint sensor nodes. In this paper we propose two energy-efficient MAC protocols asynchronous MAC A-MAC protocol and asynchronous schedule-based MAC ASMAC protocol. A-MAC and ASMAC protocols are attractive due to their suitabilities for multihop networks and capabilities of removing accumulative clock-drifts without any network synchronization. Moreover we build a traffic-strength- and network-density-based model to adjust essential algorithm parameters adaptively. Simulation results show that our algorithms can successfully acquire the optimum values of power-on off duration schedule-broadcast interval as well as super-time-slot size and order. These algorithm parameters can ensure adequate successful transmission rate short waiting time and high energy utilization. Therefore not only the performance of network is improved but also its lifetime is extended when A-MAC or ASMAC is used. Copyright 2006 Q. Ren and Q. Liang. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION AND MOTIVATIONS A wireless sensor network WSN can be thought as an ad hoc network consisting of sensor nodes that are linked by wireless medium to perform distributed sensing tasks. Recent developments in integrated circuit technology .