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Adaptive hybrid clock discipline algorithm for the network time protocol

D.L. Mills
1998 IEEE/ACM Transactions on Networking  
The algorithm is intended for the Network Time Protocol (NTP), which is in widespread use to synchronize computer clocks in the global Internet, or with another functionally equivalent protocol such as  ...  It controls the computer clock time and frequency using an adaptive-parameter, hybrid phase/frequency-lock feedback loop.  ...  The NTP Clock Discipline Algorithm In both the current NTP Version 3 and new Version 4 designs, the discipline corrects the computer clock time, compensates for its intrinsic frequency error, and adjusts  ... 
doi:10.1109/90.731182 fatcat:ooqj4h7yzreubiyoqdzkkf2rl4

Diverse synchronization issues in wireless sensor networks

Salim el Khediri, Abdennaceur Kachouri, Nejah Nasri
2011 ICM 2011 Proceeding  
In addition, it provides an insight and reference guide for future researches to tackle time synchronization issue from a different angle(Clock drift) to suggest a practical and viable trouble shooting  ...  clock synchronization gained momentum in the recent years and became a part and parcel in the deferents distributed system including wireless sensor network, and extended its application to a sundry of  ...  In contrast, TPSN and the hybrid algorithm are less affected by the size of the network.  ... 
doi:10.1109/icm.2011.6177374 fatcat:pjrmeupu5ndzrco3rpf7t3fxiy

MAC design and analysis for wireless sensor networks with co-operative localisation

M. Rengasamy, E. Dutkiewicz, M. Hedley
2007 2007 International Symposium on Communications and Information Technologies  
In such networks it is crucial for communication between nodes to be contention free to meet the strict timing requirements.  ...  In such networks it is crucial for communication between nodes to be contention free to meet the strict timing requirements.  ...  SIMULATION RESULTS We have simulated the network formation algorithm to determine the amount of time it takes for the MAC protocol to resolve the contention during the network start-up and when new nodes  ... 
doi:10.1109/iscit.2007.4392151 fatcat:4be7mnyt5jdaxlmqgudc3cth5a

Overview of Time Synchronization for IoT Deployments: Clock Discipline Algorithms and Protocols

Hüseyi̇n Yi̇ği̇tler, Behnam Badihi, Riku Jäntti
2020 Sensors  
The clock discipline algorithms are presented in a tutorial format, while the time synchronization methods are summarized as a survey.  ...  On one hand, the existing contemporary solutions for time synchronization, such as Network Time Protocol, do not easily tailor to resource-constrained devices, and on the other, the available solutions  ...  Acknowledgments: The authors would like express their gratitude to Aalto University, Department of Communications and Networking support team.  ... 
doi:10.3390/s20205928 pmid:33092256 pmcid:PMC7589954 fatcat:6iepiqhbqnhkvkedxjkyljxunm

An application of IEEE 1588 to Industrial Automation

Ken Harris
2008 2008 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication  
This paper describes an application of the IEEE 1588 standard to Industrial Automation.  ...  Key application use cases are identified that can benefit from time-based control techniques to improve performance results over traditional control methods.  ...  Clocks < 100 µsec Hardware Assist < 100 nsec Hybrid Clock Ordinary Clock Sensor Linear [ 1 ] 1 IEEE 1588-2008 Standard for Precision Clock Synchronization Protocol for Networked Measurement  ... 
doi:10.1109/ispcs.2008.4659216 fatcat:iqynlqxbuneojef7hgzahymv5y

Time Synchronization Solution for FPGA-based Distributed Network Monitoring

Ferenc Nandor Janky, Pal Varga
2018 Infocommunications journal  
Proper, system-wide time-stamping is inevitable for network monitoring and traffic analysis point of view.  ...  Access to GPS signal is complicated in these places, and Precision Time Protocol (PTP) does not seem to be supported by all network nodes in the near future – so high precision time-stamping is indeed  ...  The authors are with the Department of Telecommunications and MediaInformatics, Faculty of Electrical Engineering and Informatics, Budapest University of Technology and Economics, Magyar tudósok körútja  ... 
doi:10.36244/icj.2018.1.1 fatcat:vlxqnoc4zbhopodm6dpyj27pne

Adaptive resource allocation and scheduling for multiuser packet-based OFDM networks

Ying Jun Zhang, K.B. Letaief
2004 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577)  
In this paper, we propose a cross-layer adaptive resource allocation algorithm for packet-based OFDM systems.  ...  and system diversity in the frequency, time and user domains.  ...  In this work, we adopt the virtual clock (VC) discipline [6] . This discipline aims to imitate the TDM (time division multiplex) system while maintaining statistical multiplexing flexibility.  ... 
doi:10.1109/icc.2004.1313070 dblp:conf/icc/ZhangL04 fatcat:tjvduz3hhngrtizwpq4gqmzdky

Time-diffusion synchronization protocol for wireless sensor networks

W. Su, I.F. Akyildiz
2005 IEEE/ACM Transactions on Networking  
The Time-Diffusion Synchronization Protocol (TDP) is proposed as a network-wide time synchronization protocol.  ...  It allows the sensor network to reach an equilibrium time and maintains a small time deviation tolerance from the equilibrium time.  ...  The clock discipline algorithm may use the adaptive hybrid clock discipline algorithm intended for NTP Version 4 [15] .  ... 
doi:10.1109/tnet.2004.842228 fatcat:okghdp4h7rgctnfjwt5mhmub4y

Scheduling and Quality Differentiation in Differentiated Services [chapter]

Johanna Antila, Marko Luoma
2003 Lecture Notes in Computer Science  
The rst part of the thesis provides a literature survey about QoS guarantees, architectures and mechanisms, with the focus on scheduling disciplines.  ...  During the last decade the Internet has developed into a public multi service network that should be able to support heterogeneous applications and customers with diverse requirements.  ...  Bandwidth sharing algorithms 4.3.1 Virtual Clock Virtual Clock, rst proposed in [Zha91] , is one of the simplest scheduling disciplines that can be used for service dierentiation.  ... 
doi:10.1007/978-3-540-40012-7_10 fatcat:lqfvgfuiobgjtmv5co6rpl7r7a

Recent Advances in Complex Networks Theories with Applications

Hamid Reza Karimi, Wei Zhang, Xuebo Yang, Zhandong Yu
2014 The Scientific World Journal  
The authors examine the performance of the protocol with just enough time (JET) and just in time (JIT) reservation protocols.  ...  military disciplines.  ...  Acknowledgments We would like to express appreciation to the authors for their excellent contributions and patience in assisting us.  ... 
doi:10.1155/2014/504923 pmid:25152914 pmcid:PMC4134825 fatcat:pqny2b2h6ves3iqcglofqtexju

Scheduling multimedia services in a low-power MAC for wireless and mobile ATM networks

Jyh-Cheng Chen, K.M. Sivalingam, P. Agrawal, R. Acharya
1999 IEEE transactions on multimedia  
We evaluate the scheduling algorithms that have been proposed for traditional ATM networks.  ...  This paper describes the design and analysis of the scheduling algorithm for energy conserving medium access control (EC-MAC), which is a low-power medium access control (MAC) protocol for wireless and  ...  Reference [13] also defined a fair scheduling algorithm for wireless networks. A protocol called RQMA, which has virtual clock as the scheduling discipline for wireless ATM, was proposed in [36] .  ... 
doi:10.1109/6046.766739 fatcat:tm4cectsbbdy5aulxqfm3anpji

Message Passing Based Time Synchronization in Wireless Sensor Networks: A Survey

Mohammad Ali Sarvghadi, Tat-Chee Wan
2016 International Journal of Distributed Sensor Networks  
Various protocols have been proposed in the area of wireless sensor networks in order to achieve network-wide time synchronization.  ...  A large number of proposed protocols in the literature employ a message passing mechanism to make sensor node clocks tick in unison.  ...  Time synchronization itself is performed by the Time diffusion Procedure (TP) that consists of Time Adjustment Algorithm (TAA) and Clock Discipline Algorithm (CDA) [36] .  ... 
doi:10.1155/2016/1280904 fatcat:c7a4zvkztrhflfhpygstdqjqsa

An End-to-End Adaptation Protocol for Layered Video Multicast Using Optimal Rate Allocation

J. Liu, B. Li, Y.-Q. Zhang
2004 IEEE transactions on multimedia  
We then derive an efficient and scalable solution, and demonstrate that it can be seamlessly integrated into an end-to-end adaptation protocol, called Hybrid Adaptation Layered Multicast (HALM).  ...  We formulate the rate allocation into an optimization problem with the objective of maximizing the expected fairness index for all receivers in a multicast session.  ...  ACKNOWLEDGMENT The authors would like to thank the researchers at the Wireless and Networking Group, Microsoft Research, Asia (MSRA), for discussions about layered video transmission, and the researcher  ... 
doi:10.1109/tmm.2003.819753 fatcat:l2thure535hxfpguvwkeq7gbje

Fine-grained network time synchronization using reference broadcasts

Jeremy Elson, Lewis Girod, Deborah Estrin
2002 Proceedings of the 5th symposium on Operating systems design and implementation - OSDI '02  
Time synchronization is critical in sensor networks for diverse purposes including sensor data fusion, coordinated actuation, and power-efficient duty cycling.  ...  Though the clock accuracy and precision requirements are often stricter than in traditional distributed systems, strict energy constraints limit the resources available to meet these goals.  ...  The authors are indebted to Sensoria Corporation for support and feedback.  ... 
doi:10.1145/1060289.1060304 fatcat:5bvhbxju3beqlpkc22mskulnhu

Fine-grained network time synchronization using reference broadcasts

Jeremy Elson, Lewis Girod, Deborah Estrin
2002 ACM SIGOPS Operating Systems Review  
Time synchronization is critical in sensor networks for diverse purposes including sensor data fusion, coordinated actuation, and power-efficient duty cycling.  ...  Though the clock accuracy and precision requirements are often stricter than in traditional distributed systems, strict energy constraints limit the resources available to meet these goals.  ...  The authors are indebted to Sensoria Corporation for support and feedback.  ... 
doi:10.1145/844128.844143 fatcat:36ovprxebja3pgccegqwnegksa
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