Clock synchronization : combining IEEE 1588 and adaptive oscillator correction method

Ahmed, Waheed-Ul-Rahman; Eng, B.

doi:10.22215/etd/2012-07098

Cited by 2 publications

(10 citation statements)

References 11 publications

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“…The PTP system must support a higher packet transmission rate in order to alleviate the drift of the local oscillator. The details of the implementation of such a clock agent can be found in [4]. The major features of the implemented clock agent are summarized as follows:…”

Section: Oscillator Qualitymentioning

confidence: 99%

“…W. Ahmed et al [4] proposed a solution that combines the traditional IEEE1588 protocol and the adaptive oscillator correction model (AOCM). The solution suggests a basic implementation of the IEEE 1588 protocol using the Delay Request-Response mechanism to synchronize the slave clock with respect to the master clock in a network.…”

Section: Combined Ieee 1588 and Adaptive Oscillator Correction Modelmentioning

confidence: 99%

“…To implement such an approach, the IEEE 1588 protocol and the AOCM model for the master and the slave clock are implemented in NS-2. A clock agent is implemented in NS-2 to simulate a real clock having drifts due to temperature and aging effects [4]. To evaluate the performance of this work, test cases from an ITU-T document covering various network conditions and network loads are implemented [3].…”

Section: Combined Ieee 1588 and Adaptive Oscillator Correction Modelmentioning

confidence: 99%

“…This leaves an opportunity for future work to enhance the performance of the slave clock with respect to the master clock under a high traffic load in a network. Combined IEEE 1588 and AOCM method [4] provides the self correcting mechanism for both the master and the slave clock to reflect a network outage or temporary network failure for master-to-GPS and master-to-slave connections respectively. This work also considered the temperature and aging effects and…”

Section: Motivationmentioning

confidence: 99%

“…Therefore, it is very evident that the asymmetric latencies affect the synchronization accuracy severely between two clocks in a packet network. The solution is based on the idea of incorporating the proposed delay [4] to both the master clock and the slave clock. The purpose is to compensate the temperature and ageing effects of the local oscillator and hence to improve the accuracy and the stability of the clock during holdover mode.…”

Section: Overview Of the Proposed Solutionmentioning

confidence: 99%

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Delay Asymmetry Correction Model for IEEE 1588 Synchronization Protocol

Rahman¹

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The thesis proposes a delay asymmetry correction (DAC) model to enhance the IEEE 1588 synchronization protocol. The purpose of this work is to mitigate the effects of unpredictable packet delay variations (PDV), which cause asymmetric link delays on timing packets, in order to improve the synchronization accuracy of the slave clock with respect to the master clock. This is done by computing the time difference between the master and the slave clock in the presence of traffic in a network. The NS-2 results indicate that the proposed solution improves the slave accuracy by measuring the correct offset value in a slave clock for asymmetric communication link delays. The solution results show that the slave clock is able to achieve high synchronization accuracy in the presence of various bi-directional traffic loads, network congestions, and temporary network outage. Furthermore, when there is a routing path change due to the failure in the network, the solution also improves the accuracy of the slave clock with respect to the master clock. However, the proposed solution does not perform well when it is incorporated with the AOCM model.iii

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Section: Oscillator Qualitymentioning

confidence: 99%

Section: Combined Ieee 1588 and Adaptive Oscillator Correction Modelmentioning

confidence: 99%

Section: Combined Ieee 1588 and Adaptive Oscillator Correction Modelmentioning

confidence: 99%

Section: Motivationmentioning

confidence: 99%

Section: Overview Of the Proposed Solutionmentioning

confidence: 99%

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