Chapter 1 Introduction 1.1 WSN and Its Time Synchronization 1.2 Contributions 1.3 Book Organization Chapter 2 Review of WSN Time Synchronization 2.1 Taxonomy of WSN Time Synchronization 2.2 Development Focus of WSN Time Synchronization Chapter 3 An Asymmetric High-Precision Time Synchronization Scheme for Low Computational Complexity 3.1 Introduction 3.2 Impact of Precision Loss on Time Synchronization 3.3 Asymmetric High-Precision Time Synchronization 3.4 Experimental Results 3.5 Summary Chapter 4 A Beaconless Asymmetric Time Synchronization Scheme for Low Energy Consumption 4.1 Introduction 4.2 Energy-Efficient Time Synchronization Tailored for Resource-Constrained Sensor Nodes 4.3 Extension of BATS to Multi Hop WSNs 4.4 Experimental Results 4.5 Summary Chapter 5 A Per-Hop Delay Compensation Scheme for Improving Multi-Hop Time Synchronization Performance 5.1 Introduction 5.2 Per-Hop Delay Compensation in Multi-Hop WSNs Based on Packet Relaying Gateways 5.3 Effect of Timestamping and Clock Skew Compensation on Multi-Hop Extension Based on PHDC and TT 5.4 On the Implementation of PHDC 5.5 Performance Evaluation 5.6 Summary Chapter 6 An Optimal Message Bundling Scheme with Delay and Synchronization Constraints 6.1 Introduction 6.2 Preliminaries 6.3 ILP Model for Optimal Bundling Problem 6.4 System Design 6.5 Experimental Results 6.6 Summary Chapter 7 NISA Detection Based on Clock Features and Radio Information for WSNs 7.1 Introduction 7.2 NISA Detection Based on Clock Features and Radio Information 7.3 Centralized NISA 7.4 Distributed NISA 7.5 Experimental Results 7.6 Comparison to Related Work 7.7 Summary Chapter 8 Conclusions and Fut ure Work 8.1 Conclusions 8.2 Future Work Bibliography