Challenges in WSN Types of WSN Applications General System Architecture Components of a Sensor Networking in the Internet -protocols (TCP, IP, etc) -functionality of each layer (reliability, routing, etc) WSN MAC layer -challenges unique to wireless environment -taxonomy of solutins -802.11/802.15.4 Duty Cycling S-MAC -how it works -pros/cons LEACH -how it works -pros/cons WSN Link Layer -functionality provided Seda -what is unique about Seda -when is Seda beneficial/when is it too costly Topology Control -why? -goals Span -how it works -pros/cons Threading Sample Questions: 1. Explain Ethernet's mechanism for dealing with media access. 2. Explain why using an alternating bit protocol for reliability is inefficient. 3. Does TDMA provide any benefit over FDMA? Explain your answer. 4. How does an S-MAC node decide to be a follower? 5. Discuss one assumption that LEACH makes regarding the network on which it runs. 6. Discuss one metric you might use to evaluate LEACH and discuss how this metric would vary in response to changing network density. 7. Compare S-MAC to the MAC-layer protocol for 802.11. Give at least 1 advantage of using S-MAC in a sensor network.