MAC Protocols for WSN: Application-Centric Design and Analytical Models

MAC Protocols for WSN: Application-Centric Design and Analytical Models
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The phenomenon of wireless sensor network (WSN) has evolved as a networking paradigm with a number of distinguished attributes. Significant research effort in WSN has had to do with appropriate protocols that enables the system to achieve high-performance, and medium access control (MAC) stands out at the center of this. In this thesis, we explore MAC protocol landscape for WSN from two perspectives. \emph{First,} from the viewpoint of design issue, we observe that despite certain commonalities in terms of the desired features in the protocols being devised, it is precisely the nature of intended applications that decides down the line the design goals and the effective performance of a particular protocol. Having made this case in ligh of the existing works, we present the preliminary design of a reservation-TDMA based MAC protocol that respects such QoS requirements as criticality (priority) as well as accommodates traffic heterogeneity, with such medical usage as patient monitoring being the representative application domain. For design efficiency, it exploits certain system properties presumably to come with the targeted applications -- specifically, in terms of network topology (centrally controlled, single hop) and traffic characteristics (upstream traffic, periodically predictable). Secondly, when it comes to designing contention based protocols for energy-constrained wireless networks, a fundamental priority in is to maintain the power consumed by the transceiver low while retaining higher efficiency in data communication performance. This becomes relatively easy to achieve in a centralized network dealing mostly with uplink traffic. The slotted carrier sense multiple access with collision avoidance (CSMA/CA) adopted in the contention access period of the MAC part of the IEEE 802.15.4 standard illustrates such design. We analytically approach to investigate the behavior of this class of protocols. Specifically, we develop an analytical model to study suc
1 Introduction 1 2 Background 4 2.1 MAC Protocols for WSN in Healthcare 4 2.1.1 Related Works 5 2.1.2 System Model and Problem Statement 5 2.2 Analytical Model for Contention Based MAC 7 2.2.1 CAP in IEEE 802.15.4 8 2.2.2 Mathematical Analysis 9 2.2.3 Related Works 9 2.2.4 Analyzing the CAP in 802.15.4 10 3 QoS-Aware Reservation-based MAC 11 3.1 QoS Respecting MAC 12 3.1.1 Managing Schedules in Superframes 12 3.1.2 QoS Provisioning and Emergency 13 3.2 Performance Issues 14 3.2.1 Simulation 15 3.2.2 Superframe Length and Network Size 15 3.3 Discussion 16 4 Analysis of CAP in IEEE 802.15.4 17 4.1 Basic Framework 19 4.1.1 Node-state model and sensing probability 19 4.1.2 Channel-state model and sensing failure probability 22 4.2 MAC Performance Analysis 24 4.2.1 Throughput 24 4.2.2 Mean Frame Service Time 25 4.2.3 Energy Consumption 25 4.3 Numerical Evaluation and Comparison 27 4.4 Discussion 32 5 Conclusions and Future Work 33 5.1 Future Work 33 Bibliography 35
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College of Engineering(공과대학) > Graduate School of IT & Telecommunications (정보통신대학원) > Theses(정보통신대학원 석박사 학위논문)
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