CesiumSpray: a Precise and Accurate Global Time Servicefor Large-scale Systems
Real-Time Systems - Special issue on global time in large scale distributed real-time systems, part III
Integrating External and Internal Clock Synchronization
Real-Time Systems - Special issue on global time in large scale distributed real-time systems, part II
Interval-based Clock Synchronization
Real-Time Systems - Special issue on global time in large scale distributed real-time systems, part II
An interval-based framework for clock rate synchronization
PODC '97 Proceedings of the sixteenth annual ACM symposium on Principles of distributed computing
Adaptive hybrid clock discipline algorithm for the network time protocol
IEEE/ACM Transactions on Networking (TON)
Wireless integrated network sensors
Communications of the ACM
Time synchronization in ad hoc networks
MobiHoc '01 Proceedings of the 2nd ACM international symposium on Mobile ad hoc networking & computing
Wireless sensor networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
Wireless sensor networks: a new regime for time synchronization
ACM SIGCOMM Computer Communication Review
Building Fault-Tolerant Hardware Clocks from COTS Components
DCCA '99 Proceedings of the conference on Dependable Computing for Critical Applications
Maintaining the time in a distributed system
PODC '83 Proceedings of the second annual ACM symposium on Principles of distributed computing
Asymptotically optimal time synchronization in dense sensor networks
WSNA '03 Proceedings of the 2nd ACM international conference on Wireless sensor networks and applications
Lightweight time synchronization for sensor networks
WSNA '03 Proceedings of the 2nd ACM international conference on Wireless sensor networks and applications
Timing-sync protocol for sensor networks
Proceedings of the 1st international conference on Embedded networked sensor systems
TSync: a lightweight bidirectional time synchronization service for wireless sensor networks
ACM SIGMOBILE Mobile Computing and Communications Review - Special issue on wireless pan & sensor networks
Adaptive clock synchronization in sensor networks
Proceedings of the 3rd international symposium on Information processing in sensor networks
Improved interval-based clock synchronization in sensor networks
Proceedings of the 3rd international symposium on Information processing in sensor networks
Internal synchronization of drift-constraint clocks in ad-hoc sensor networks
Proceedings of the 5th ACM international symposium on Mobile ad hoc networking and computing
Fine-grained network time synchronization using reference broadcasts
OSDI '02 Proceedings of the 5th symposium on Operating systems design and implementationCopyright restrictions prevent ACM from being able to make the PDFs for this conference available for downloading
An energy-efficient querying framework in sensor networks for detecting node similarities
Proceedings of the 9th ACM international symposium on Modeling analysis and simulation of wireless and mobile systems
Lowering radio duty cycle through temperature compensated timing
Proceedings of the 4th international conference on Embedded networked sensor systems
International Journal of Network Management
IKNOS: inference and knowledge in networks of sensors
International Journal of Sensor Networks
A robust approach for clock offset estimation in wireless sensor networks
EURASIP Journal on Advances in Signal Processing
PAQ: time series forecasting for approximate query answering in sensor networks
EWSN'06 Proceedings of the Third European conference on Wireless Sensor Networks
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We study the problem of providing a sensor node with an accurate estimate of the current time, from a novel prospective which is complementary to the well--studied clock synchronization problem. More precisely, we analyze the case in which a sensor node is temporarily unable to run a clock synchronization protocol due to low--energy, or intermittent connectivity, or process failures, but still requires an accurate estimate of the time. We propose and analyze two efficient clock reading methods, one deterministic and the other probabilistic, which are designed to work in synergy with clock synchronization protocols to provide a better time estimate. Our deterministic method achieves a better accuracy by exploiting the sign of the global deviation of the hardware clock from the reference time, and can be applied to reduce the frequency of the periodic clock adjustments by a factor 2, while maintaining the same time uncertainty. The second method based on time series forecasting, is more flexible than the previous one since it is independent of the frequency at which clock synchronization occur.