Name:
TWES
TItle:
Time in Wireless Embedded Systems
Description:
Wireless embedded networks have matured beyond academic research as industry now considers the advantages of using wireless sensors. With this growth, reliability and real-time demands increase, thus timing becomes more and more relevant.
This project explores the further development of highly stable, low-power clocks for wireless embedded systems. Wireless embedded networks, due to their wire-free nature, present one of the most extreme power budget design challenges in the field of electronics. Improvements in timing can reduce the energy required to operate an embedded network. However, the more accurate a time source is, the more power it consumes. To comprehensively address the time and power problems in wireless embedded systems, we studied the exploitation of dual-crystal clock architectures to combat effects of temperature induced frequency error and high power consumption of high-frequency clocks. Combining these architectures with the inherent communication capabilities of wireless embedded systems, this project proposes two new technologies;
(1) a new time synchronization service that automatically calibrates a local clock to changes in temperature;
(2) a high-low frequency timer that allows a duty-cycled embedded system to achieve ultra low-power sleep, while keeping fine granularity time resolution offered only by high power, high frequency clocks.
Software:
Status:
Inactive Project
Main Research Area:
Power-aware Computing and Communications
Participants:
Documents:
- Exploiting Manufacturing Variations for Compensating Environment-induced Clock Drift in Time Synchronization
Thomas Schmid, Zainul M. Charbiwala, Jonathan Friedman, Young H. Cho, and Mani B. Srivastava.
ACM Sigmetrics 2008, June 2008. [ Details ]
- XCXO: An Ultra-low Cost Ultra-high Accuracy Clock System for Wireless Sensor Networks in Harsh Remote Outdoor Environments
Thomas Schmid, Jonathan Friedman, Zainul M. Charbiwala, Young H. Cho, and Mani B. Srivastava.
ISSCC/DAC 2008 (Unpublished Student Design Contest Entry, Award Winner), February 2008. [ Details ]
- Low-Power High-Accuracy Timing Systems for Efficient Duty Cycling
Thomas Schmid, Jonathan Friedman, Zainul M. Charbiwala, Young H. Cho, and Mani B. Srivastava.
ISLPED 2008, August 2008. [ Details ]
- On the Impact of Time Synchronization on Quality of Information and Network Performance
Kartik Ariyur, Thomas Schmid, Yunjung Yi, Zainul M. Charbiwala, and Mani B. Srivastava.
The Second Annual Conference of the International Technology Alliance (ACITA 2008) [Accepted], September 2008. [ Details ]
- The True Cost of Accurate Time
Thomas Schmid, Zainul M. Charbiwala, Jonathan Friedman, Young H. Cho, and Mani B. Srivastava.
HotPower '08, December 2008. [ Details ]
- On the Interaction of Clocks, Power, and Synchronization in Duty-Cycled Embedded Sensor Nodes
Thomas Schmid, Roy S. Shea, Zainul M. Charbiwala, Jonathan Friedman, Young H. Cho, and Mani B. Srivastava.
Accepted for Publication in ACM Transactions on Sensor Networks, March 2010. [ Details ]
- Temperature Compensated Time Synchronization
Thomas Schmid, Zainul M. Charbiwala, Roy S. Shea, and Mani B. Srivastava.
IEEE Embedded Systems Letters, August 2009. [ Details ]
- On the Interaction of Clocks and Power in Embedded Sensor Nodes
Thomas Schmid, Roy S. Shea, Jonathan Friedman, Zainul M. Charbiwala, Mani B. Srivastava, and Young H. Cho.
Techreport, June 2009. [ Details ]
- Demo Abstract: Low-power High-precision Timing Hardware for Sensor Networks
Thomas Schmid, Dustin Torres, and Mani B. Srivastava.
SenSys, November 2009. [ Details ]
- Time in Wireless Embedded Systems
Thomas Schmid.
Ph.D. Dissertation, September 2009. [ Details ]
- High-Resolution, Low-Power Time Synchronization an Oxymoron No More
Thomas Schmid, Prabal Dutta, and Mani B. Srivastava.
IPSN [Best Paper Award], April 2010. [ Details ]
- A Case Against Routing-Integrated Time Synchronization
Thomas Schmid, Zainul M. Charbiwala, Zafeiria Anagnostopoulou, Mani B. Srivastava, and Prabal Dutta.
ACM SenSys, November 2010. [ Details ]
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