1 An Introduction to QoS in Wireless Sensor Networks 1.0.1 Wireless Sensor Network Architecture 1.0.2 Network Layer Issues and Challenges 1.0.3 Limitations of Wireless Sensor Networks 1.0.4 Challenges of Wireless Sensor Networks1.0.5 Medium Access Control Layer Issues and Challenges 1.0.6 Issues of Medium Access Control MAC Layer 1.0.7 MAC Scheme Design Challenges 1.1 MAC Scheme in Wireless Sensor Networks 1.1.1 Contention-freeMAC Protocols 1.1.2 Contention MAC Protocols 1.1.3 Hybrid MAC Protocols 1.2 Motivation 1.2.1 Network Layer1.2.2 Medium Access Control Layer 1.2.3 Design and Evaluation Metrics in the Network Layer 1.2.4 Design and Evaluation Metrics in the Medium Access Layer1.3 Applications of Wireless Sensor Networks 1.4 Quality of Service in Wireless Sensor Networks 1.4.1 Introduction 1.4.2 Quality of Service Architecture 1.4.3 Network and MAC Layer QoS Challenges 1.4.4 Network and MAC Layer QoS Requirements 1.5 Software Tools 1.6 Organization of the Book References 2 LRTHR: Link-Reliability Based Two-Hop Routing forWSNs 2.1 Introduction 2.2 Related Works 2.3 System Model and Problem Definition 2.4 Algorithm 2.4.1 Link Reliability Estimation 2.4.2 Link Delay Estimation 2.4.3 Node Forwarding Metric 2.4.4 LRTHR: An Example 2.5 Performance Evaluation 2.6 Summary References 3 FTQAC: Fault Tolerant QoS Adaptive Clustering forWSNs 3.1 Introduction 3.2 Related Works 3.3 System Model and Problem Definition 3.4 Cluster Setup and Primary Cluster Head Selection 3.5 Secondary Cluster Head Selection3.6 QoS Route Establishment 3.7 Simulation Setup 3.8 Summary References 4 RTTDR: Real-Time Traffic-Differentiated Routing forWSNs 4.1 Introduction 4.2 Related Works 4.3 System Model and Problem Definition 4.4 Algorithm 4.4.1 Link Reliability Estimation 4.4.2 Queueing and Transmission Delay Estimation 4.4.3 Node Forwarding Metric 4.4.4 Queuing Controller 4.5 Implementation and Performance Evaluation4.6 Summary References 5 RARR: Reliable Adaptive Replication Routing Scheme forWSNs5.1 Introduction 5.2 Related Works 5.3 System Model and Problem Definition 5.4 Algorithm 5.4.1 Link Capacity Estimator 5.4.2 Packet Disseminator 5.4.3 Packet Replicator 5.5 Simulation and Performance Evaluation 5.6 Summary References 6 ETXTD: ETX and RTT Delay based Fault Detection Algorithm forWSNs 6.1 Introduction6.2 Related Works 6.3 System Model and Problem Definition 6.4 Algorithm 6.4.1 Estimation of Expected Transmission Count (ETX) Metric6.4.2 Estimation of Round Trip Time (RTT) and Round TripPath (RTP) 6.4.3 Detection of Faulty Sensor Node 6.4.4 Performance Evaluation 6.5 Summary References 7 DQTSM: Distributed Qos in Time Synchronized MAC Protocol forWSNs 7.1 Intr