Topic
Precision Time Protocol
About: Precision Time Protocol is a research topic. Over the lifetime, 604 publications have been published within this topic receiving 6006 citations. The topic is also known as: PTP & IEEE 1588.
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26 Jul 2011
TL;DR: The design idea of Precision Time Protocol IP core, which is different from traditional method of software implementation, indicates that it has higher synchronization precision than software implementation.
Abstract: This paper describes a design idea of Precision Time Protocol IP core, which is different from traditional method of software implementation. Design gives prominence to adopt digital logic circuit to achieve getting of precision time stamp, synchronization algorithm and quartz oscillator frequency-compensated algorithm and state-transfer controlled algorithm, And make use of oscillator's divided frequency adjusted to reduce influence of oscillator's frequency-excursion and circumstance factor to precision and stability of synchronization. The result of the function test indicates that it has higher synchronization precision than software implementation.
01 Jan 2021
TL;DR: In this paper, the authors describe the methodology of achieving high accuracy level of PTP grandmaster clock and then a method to minimise the drift of the grand-master from the GPS/IRNSS time when the satellite signal is lost.
Abstract: For highly stable and accurate time synchronization master system a highly stable and accurate clock is required. A multiple master system ends up in replication of hardware and increase in the cost of the system. Various defence applications, Intelligent Electronic Devices in transmission stations, GPS applications etc needs accurate timing information. An accurate time synchronization server needs a highly stable accurate clock, NMEA time code, 1-PPS (pulse per second) sync signal from GPS/IRNSS receiver and a core processor which processes these two information with high precision. Time information from different sources makes the system reliable but that increases the cost as well. Also, when the satellite signal is lost, different receivers have different time as they all drift with different speed from the reference signal. Thus, there is a need to reduce the cost and at the same time need to have one but highly accurate time server which not only provides stable and correct time but also functions in the same way when the signal from the satellite is lost. In this paper, we first describe our methodology of achieving high accuracy level of PTP grand-master clock and then a method to minimise the drift of the grand-master from the GPS/IRNSS time when the satellite signal is lost ....
18 Oct 2020
TL;DR: The hardware-software co-design of the full SoC MAC-PHY can select the PTP timestamp point to remove the random transmission jitters caused by higher layers and the imbalanced timing made by the rugged hardware designs between master and slave.
Abstract: In this paper, we propose a hardware development of a high accuracy Precision Time Protocol (PTP) on Software Defined Radio (SDR) for Industrial WLAN systems. To increase the throughput of the transmission system, we propose a low overhead 3-frames exchange PTP instead of 4-frames transmission as IEEE 1588 PTP protocol. Besides, our hardware-software co-design of the full SoC MAC-PHY can select the PTP timestamp point to remove the random transmission jitters caused by higher layers and the imbalanced timing made by the rugged hardware designs between master and slave. In previous work, the PTP synchronization has been evaluated on the M820-ZYNQ platform with Dummy PHY. In this paper, the proposed PTP system is developed on the SDR platform with real PHY. The SDR platform can reduce the processing delay between software and hardware compared to the previous platform. The result of our demonstration experiments shows that an oscilloscope captures the time synchronization of the proposed system in high accuracy with the nano-second level, which is less than 200 ns.
TL;DR: A novel balanced synchronization hierarchy with spare masters (BSHSM) algorithm is proposed to establish a balanced master-slave hierarchy and to provide a fast recovery mechanism in the case of master failures for the PTP, which is much more balanced than the BMC algorithm.
Abstract: The best master clock (BMC) algorithm is currently used to establish the master-slave hierarchy for the IEEE 1588 Precision Time Protocol (PTP) However, the BMC algorithm may create an unbalanced hierarchy that contains several boundary clocks with a large number of slaves in comparison to other clocks The unbalanced hierarchy can cause problems, such as high communication load and high bandwidth consumption in boundary clocks Additionally, the BMC algorithm does not provide any fast recovery mechanism in the case of a master failure In this paper, we propose a novel balanced synchronization hierarchy with spare masters (BSHSM) algorithm to establish a balanced master-slave hierarchy and to provide a fast recovery mechanism in the case of master failures for the PTP The BSHSM algorithm establishes the master-slave hierarchy with boundary clocks that have a balanced number of slaves In doing so, it solves the problems caused by the unbalanced master-slave hierarchy Additionally, the BSHSM algorithm provides a fast recovery mechanism by selecting a spare master for each boundary clock; this allows a boundary clock to immediately select a new master clock when its current master has failed or is disconnected The fast recovery mechanism reduces the period of running freely and clock drift in clocks, improving the synchronization quality of the PTP Various simulations were conducted using the network simulation OMNeT++ v46 to analyze, evaluate, and compare the performance of the BSHSM and BMC algorithms The simulation results show that the synchronization hierarchy of the BSHSM algorithm is much more balanced than the BMC algorithm, and it also has a shorter period of recovery