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ABSTRACT: This paper proposes the integration of internal and external clock synchronization by a combination of a fault-tolerant distributed
algorithm for clock state correction with a central algorithm for clock rate correction. By means of hardware and simulation
experiments it is shown that this combination improves the precision of the global time base in a distributed single cluster
system while reducing the need for high-quality oscillators. Simulation results have shown that the rate-correction algorithm
contributes not only in the internal clock synchronization of a single cluster system, but it can be used for external clock
synchronization of a multi-cluster system with a reference clock. Therefore, deployment of the rate-correction algorithm integrates
internal and external clock synchronization in one mechanism. Experimental results show that a failure in the clock rate correction
will not hinder the distributed fault-tolerant clock state synchronization algorithm, since the state correction operates
independently from the rate correction. The paper introduces new algorithms and presents experimental results on the achieved
improvements in the precision measured in a time-triggered system. Results of simulation experiments of the new algorithms
in single-cluster and multi-cluster configurations are also presented.
Real-Time Systems 06/2006; 33(1):139-173. · 0.74 Impact Factor
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ARCS 2006 - 19th International Conference on Architecture of Computing Systems, Workshops Proceedings, March 16, 2006, Frankfurt am Main, Germany; 01/2006
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Proceedings of the 25th IEEE Real-Time Systems Symposium (RTSS 2004), 5-8 December 2004, Lisbon, Portugal; 01/2004
