chapter 1 Opportunities and Challenges in Wireless Sensor Networks -- chapter 2 Next-Generation Technologies to Enable Sensor Networks -- chapter 3 A Taxonomy of Routing Techniques in Wireless Sensor Networks -- chapter 4 Overview of Communication Protocols for Sensor Networks -- chapter 5 A Comparative Study of Energy-Efficient (E2) Protocols for Wireless Sensor Networks -- chapter 6 Fundamental Protocols to Gather Information in Wireless Sensor Networks -- chapter 7 Design Challenges in Energy-Efficient Medium Access Control for Wireless Sensor Networks -- chapter 8 Techniques to Reduce Communication and Computation Energy in Wireless Sensor Networks -- chapter 9 Energy-Aware Routing and Data Funneling in Sensor Networks -- chapter 10 Reliable Energy-Constrained Routing in Sensor Networks -- chapter 11 Localized Algorithms for Sensor Networks.