Pub Date : 2011-11-07DOI: 10.1109/ISPCS.2011.6070145
G. Giorgi, C. Narduzzi
Several factors may impact on the achievable performances of a synchronization system: among them, the accuracy of drift and offset estimates, the short and long term stability of the unregulated clock, the rate at which timing information are exchanged, the probability of losing protocol messages for a given period of time and so on. Therefore, when a synchronization scheme is considered, it is very important to also specify its robustness to possible malfunctions. In this paper the behaviour of synchronization mechanisms will be studied in correspondence to a synchronization loss. We shall analyse how clock instability and other factors, such as timestamp uncertainty and the particular implementation of a servo clock, may strongly affect the performances of a synchronization protocol. Finally, an accurate study based on the effect of measurement uncertainty will be reported to evaluate the robustness of a given synchronization mechanism with respect to an information loss.
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Pub Date : 2011-11-07DOI: 10.1109/ISPCS.2011.6070143
M. Ouellette, G. Garner, S. Jobert
This paper describes the use of Boundary Clocks for clock distribution (phase/time transfer) in telecom networks. The technology is primarily used to meet synchronization requirements of mobile systems such as TD-SCDMA and LTE, and to reduce the use of and dependency on GPS systems deployed in base stations. We describe the most important functions of a Telecom Boundary Clock, which are under discussion at ITU-T. We then present a network reference model and simulation model based on IEEE1588 and Synchronous Ethernet. The results indicate that it is possible to transfer phase/time in a telecom network for meeting the microsecond-level requirement of various mobile systems. The paper also discusses some of the ongoing activities in standardization bodies so that IEEE1588 can be used as a technology in telecom networks.
{"title":"Simulations of a chain of Telecom Boundary Clocks combined with Synchronous Ethernet for phase/time transfer","authors":"M. Ouellette, G. Garner, S. Jobert","doi":"10.1109/ISPCS.2011.6070143","DOIUrl":"https://doi.org/10.1109/ISPCS.2011.6070143","url":null,"abstract":"This paper describes the use of Boundary Clocks for clock distribution (phase/time transfer) in telecom networks. The technology is primarily used to meet synchronization requirements of mobile systems such as TD-SCDMA and LTE, and to reduce the use of and dependency on GPS systems deployed in base stations. We describe the most important functions of a Telecom Boundary Clock, which are under discussion at ITU-T. We then present a network reference model and simulation model based on IEEE1588 and Synchronous Ethernet. The results indicate that it is possible to transfer phase/time in a telecom network for meeting the microsecond-level requirement of various mobile systems. The paper also discusses some of the ongoing activities in standardization bodies so that IEEE1588 can be used as a technology in telecom networks.","PeriodicalId":416451,"journal":{"name":"2011 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123588064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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