1. Fault Tolerant WSN Routing Dong Han Advisor: Dr. Omprakash Gnawali Networked Systems Laboratory University of Houston http://nsl.cs.uh.edu/ 1

2. Project list Finished: – Understanding Desktop Energy Footprint in an Academic Computer Lab Current: – Fault Tolerant WSN Routing 2

3. Understanding Desktop Energy Footprint in an Academic Computer Lab Wireless power meter (59.6m records) User activity logger (220.3m records) 3

4. Understanding Desktop Energy Footprint in an Academic Computer Lab Contributions – Present a large dataset describing computing power data – Understand the relation between user activities and power draw – Identify energy waste Dong Han and Omprakash Gnawali, Understanding Desktop Energy Footprint in an Academic Computer Lab, The IEEE International Conference on Green Computing and Communications (GreenCom 2012), November 2012. 4

5. Fault Tolerant WSN Routing Wireless Sensor Network (WSN) has limited resources: – Energy; Transmission Power; Communication Range; Throughput Made great efforts to deliver each packet – Send: …1010001110110000011110… – Received: …1010001110100000011110… – CRC check failed -> Drop 5

6. Related works Re-transmissions – End-to-end – Hop-by-hop Forward error correction 6

7. CTP Data Frame 7 In CTP header – up to 63 out of 64 bits (98.4375%) are fault tolerate

8. Current Status Disabled Hardware CRC – Accept packet contain errors 8 CTP HeaderPayload Bit errors

9. Next Steps Identify corrupted packets Correct and forward the corrupted packets Determine if this technique will save energy 9

10. Question 10