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Survey on the Clock Synchronization Schemes for Propagation Delay Measurement
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- Authors
- Min Su Shin, Man Kyu Park, Deock Gil Oh, Byung Chul Kim, Jae Yong Lee
- Issue Date
- 2011-10
- Citation
- International Journal of Advanced Science and Technology, v.35, pp.139-150
- ISSN
- 2005-4238
- Publisher
- SERSC
- Language
- English
- Type
- Journal Article
- Abstract
- In this paper we present the comprehensive survey on the clock synchronization algorithms, which should be considered for the measurements of the network delay. We categorize the clock synchronization algorithms into two basic types according to how they acquire synchronization between clocks, which are external source based schemes and end-to-end measurement based schemes. While external source based schemes are the synchronization methods using centralized time source such as NTP, GPS and IEEE 1588 to have global synchronization for all end hosts, end-to-end schemes obtain synchronization information through network measurements between end hosts. We briefly introduces some algorithms in both categories. However, we have focused more on the end-to-end schemes which can be classified again into online and offline schemes according to whether they can be applied for real time operation. We survey the recent progresses on these end-to-end algorithms and special concerns are on the estimation of true the one-way delay without the effect of clock skew. The problems in deploying each end-to-end scheme are also described. The potential further research issues in online one-way delay estimation are discussed.
- KSP Keywords
- Clock Synchronization, Clock skew, Delay measurement, End hosts, End to End(E2E), End-to-end measurement, IEEE 1588, Network Delay, One-Way Delay, Online and Offline, Propagation delay