Global Positioning System (GPS) Time Dissemination for Real-Time Applications
Real-Time Systems - Special issue on global time in large scale distributed real-time systems, part I
Distributed Systems for System Architects
Distributed Systems for System Architects
Coping with irregular spatio-temporal sampling in sensor networks
ACM SIGCOMM Computer Communication Review
Basic Concepts and Taxonomy of Dependable and Secure Computing
IEEE Transactions on Dependable and Secure Computing
Robust synchronization of software clocks across the internet
Proceedings of the 4th ACM SIGCOMM conference on Internet measurement
The flooding time synchronization protocol
SenSys '04 Proceedings of the 2nd international conference on Embedded networked sensor systems
Foundations of Measurement Theory Applied to the Evaluation of Dependability Attributes
DSN '07 Proceedings of the 37th Annual IEEE/IFIP International Conference on Dependable Systems and Networks
A Self-Aware Clock for Pervasive Computing Systems
PDP '07 Proceedings of the 15th Euromicro International Conference on Parallel, Distributed and Network-Based Processing
Assuring Resilient Time Synchronization
SRDS '08 Proceedings of the 2008 Symposium on Reliable Distributed Systems
Estimating clock uncertainty for efficient duty-cycling in sensor networks
IEEE/ACM Transactions on Networking (TON)
An Experimental Framework for the Analysis and Validation of Software Clocks
SEUS '09 Proceedings of the 7th IFIP WG 10.2 International Workshop on Software Technologies for Embedded and Ubiquitous Systems
Experimental Validation of a Synchronization Uncertainty-Aware Software Clock
SRDS '10 Proceedings of the 2010 29th IEEE Symposium on Reliable Distributed Systems
Clock synchronization with deterministic accuracy guarantee
EWSN'11 Proceedings of the 8th European conference on Wireless sensor networks
Design and Implementation of Real-Time Wearable Devices for a Safety-Critical Track Warning System
HASE '12 Proceedings of the 2012 IEEE 14th International Symposium on High-Assurance Systems Engineering
| Hi-index | 0.00 |
Many pervasive and distributed systems require clocks synchronised to a unique and external reference time. Unfortunately, the actual difference between the time of a local clock and the reference time, called offset, is a variable factor that is very hard to compute: synchronisation mechanisms typically estimate the offset, without offering guarantees of closeness of the estimate to the true value. The paper gives a comprehensive description of the Reliable and Self-Aware Clock R&SAClock, a new software clock that provides both the current time and the synchronisation uncertainty, that is a self-adaptive and conservative estimate of the offset, thus being capable of monitoring synchronisation quality and detecting clock failures. Two different solutions are presented for the evaluation of the synchronisation uncertainty which differ in terms of performance and coverage, and are evaluated in the context of distributed wearable mobile devices intended for railway trackside workers.