Patent
Method and devices for synchronization using linear programming
TLDR
In this paper, a two-dimensional linear programming technique for estimating clock offset and skew, particularly from two-way exchange of timing messages between a master and a slave device, is presented.Abstract:
This invention relates to methods and devices for synchronization using linear programming, especially over packet networks using, for example, the IEEE 1588 Precision Time Protocol (PTP). Timing protocol messages are exposed to artifacts in the network such as packet delay variations (PDV) or packet losses. Embodiments of the invention provide a two-dimensional linear programming technique for estimating clock offset and skew, particularly from two-way exchange of timing messages between a master and a slave device. Some embodiments include a skew and offset adjustable free-running counter for regenerating the master time and frequency at the slave device.read more
Citations
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References
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Journal ArticleDOI
Time synchronization in sensor networks: a survey
Fikret Sivrikaya,Bülent Yener +1 more
TL;DR: The time synchronization problem and the need for synchronization in sensor networks is reviewed, then the basic synchronization methods explicitly designed and proposed for sensor networks are presented.
Journal ArticleDOI
Clock Synchronization of Wireless Sensor Networks
TL;DR: This article illustrates that many of the proposed clock synchronization protocols can be interpreted and their performance assessed using common statistical signal processing methods, and shows that advanced signal processing techniques enable the derivation of optimal clock synchronization algorithms under challenging scenarios.
Proceedings ArticleDOI
Estimation and removal of clock skew from network delay measurements
Sue Moon,P. Skelly,Don Towsley +2 more
TL;DR: A linear programming-based algorithm is introduced to estimate the clock skew in network delay measurements and its performance is compared to that of three other algorithms to show that the algorithm is unbiased, and that the sample variance of the skew estimate is better than existing algorithms.
Proceedings ArticleDOI
Clock synchronization algorithms for network measurements
Li Zhang,Zhen Liu,C. Honghui Xia +2 more
TL;DR: This work proposes several algorithms to estimate and remove the relative clock skews from delay measurements based on the computation of convex hulls, and develops linear algorithms to identity the clock resets, and derive the best clock skew lines.
Patent
Method and apparatus for time and frequency transfer in communication networks
James Aweya,Luis Orozco Barbosa +1 more
TL;DR: In this paper, a phase-locked loop driven client clock counter is used for time synchronization between a time server and a time client over a packet network, where the client periodically exchanges time transfer protocol messages with the time server over the packet network and calculates an estimated client time based on the timestamp information.