Research And Implementation Of MAC Protocols Of Wireless Sensor Networks

A Wireless sensor network (WSN) consists of a certain number of smart sensors which form a multi-hop Ad Hoc network by radio communications in sensor field. MAC protocol which is in the bottom of WSN protocol stack has great influence on the performormance of WSN. So MAC protocol is one of key protocols of WSN. The main mission of this thesis is to design a test-bed of WSN and propose new low traffic energy efficient MAC Protocols to fit WSN. There are six chapters in the thesis.First of all, the background of WSN is discussed. At the end of this chapter, the main research task and section arrangement are introduced. Chapter 2 introduces some important MAC protocols of WSN, and focus on contention- based MAC protocols.In chapter 3, we propose hardware design scheme of the test-bed, and mainly discuss the design of sensor nodes and sink node.In chapter 4, three new MAC protocols are presented according to our test-bed.Inspired by S-MAC and TEEM, we propose TAMAC (Traffic Aware MAC) that is contention-based low traffic energy efficient MAC protocol.In chapter 5, embedded gateway protocols are implemented in sink node based on hardware drivers.Finally, we discuss debugging scheme of test-bed, and compare actual performances of different MAC protocols.Our experimental results denmonstrate that our test-bed works well, and TAMAC scheme saves significant enerny compared to S-MAC or other contension-based MAC protocols. So our scheme is suitable for the situation nodes of which require long life...