SDN/NFV Enhanced Time Synchronization in Packet Networks

Li, Hongxing; Shou, Guochu; Hu, Yihong; Liu, Yaqiong

doi:10.1109/jsyst.2020.3030664

Cited by 10 publications

(4 citation statements)

References 28 publications

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“…2) The synchronization path management module determines the synchronization path between the master and slave clocks, pre-configures alternate synchronization paths, and switches the synchronization path. Furthermore, the synchronization controller can support additional time synchronization functions, such as generating precision compensation strategies based on whether or not the network is PTP-aware [24].…”

Section: Sdn/nfv-based Security Management For Time Synchronization a Network Architecturementioning

confidence: 99%

“…As a result, the network becomes programmable and flexible, and the SDN controller can schedule traffic across the network at a global level. Simultaneously, SDN-based time synchronization and software-defined time synchronization networks are proposed and discussed [22]- [24]. The solution towards the synchronization security issues has opened up new possibilities.…”

Section: Introductionmentioning

confidence: 99%

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A Security Management Architecture for Time Synchronization Towards High Precision Networks

Zhang

et al. 2021

IEEE Access

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Time synchronization is quickly becoming a fundamental prerequisite for a smart society. With the development of the fifth-generation (5G) network, time-sensitive networking (TSN), and the rise of highprecision networks, its accurate and reliable features have attracted an increasing amount of attention. As the most promising protocol with sub-microsecond accuracy, precision time protocol (PTP) has been widely used for network synchronization, and its proper operation and security are critical to the industries that build the infrastructure for a smart society. In order to provide synchronization security as a service, this paper presents a scheme based on software-defined networking (SDN) and network functions virtualization (NFV) principles for synchronization security. Security management is built as a virtual network function (VNF), and a mitigation mechanism is proposed to detect delay attacks and generate countermeasures. Finally, we investigate the impact of random delay attacks, constant delay attacks, and linear delay attacks and verify the performance of the proposed mitigation mechanism through experiments. The results show that the scheme is capable of detecting PTP delay attacks and mitigating their impact on time synchronization.INDEX TERMS Time synchronization, delay attacks, precision time protocol, software-defined networking, network functions virtualization, time-sensitive networking, high precision communication.

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Section: Sdn/nfv-based Security Management For Time Synchronization a Network Architecturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Security Management Architecture for Time Synchronization Towards High Precision Networks

Zhang

et al. 2021

IEEE Access

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“…The SDN controller can act as a central point for time synchronization between different biomechanical equipment, improving the accuracy of the timestamps of generated data. Evaluation results have shown that SDN enables accurate time synchronization with negligible errors in the order of 10-44ns [15]. An SDN controller constitutes a single point of failure, a weakness that can be mitigated through distributed control planes falling under two major categories [4]: (i) maintaining multiple replicas of an SDN controller in a flat fashion; and (ii) creating a hierarchy of SDN controllers.…”

Section: How Can Networking and Computing Enablementioning

confidence: 99%

Networking and Computing in Biomechanical Research: Challenges and Directions

Mastorakis¹,

Skiadopoulos²,

Shannigrahi³

et al. 2021

Preprint

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Biomechanics is a scientific discipline that studies the forces acting on a body and the effects they produce. In this paper, we bring together biomechanists and networking researchers to shed light into how research efforts in biomechanics, primarily related to the study of the human body, can be facilitated through networking and computing technologies, such as edge and cloud computing, Software Defined Networking, and Information-Centric Networking. We first present challenges related to networking and computing that biomechanists face today and we then describe how networking and computing technologies can address them. Finally, we identify directions for future networking research with a focus on biomechanics to facilitate and encourage interdisciplinary collaborations between biomechanists and networking researchers.

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“…Absolute time synchronization technology has been studied for decades, such as the ubiquitous Network Time Protocol (NTP) [10], the widely-used Precision Timing Protocol (PTP) [11], the Global Navigation Satellite System (GNSS) timing, the long and short wave timing (like low-frequency-timecode), the Flooding Time Synchronization Protocol (FTSP) [12] for Zigbee radios, Reference Broadcast Infrastructure Synchronization (RBIS) [13], WizSync for Wireless Sensor Networks (WSN) [14], etc [15] [16]. These technologies and their derivatives can well meet the needs of traditional application [17] [18]. Specifically, the GNSS-based timing methods are suitable for outdoor nanosecond level timing.…”

Section: Introductionmentioning

confidence: 99%

TAP: A High-Precision Network Timing Method Over Air Interface Based on Physical-Layer Signals

Zhang¹,

Zheng²,

Wang³

2019

IEEE Access

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Absolute time synchronization (timing) is a constant demand in various fields. There are many timing techniques at present. They are mainly based on dedicated equipments such as GNSS or specific protocols such as NTP, PTP, SIB16, etc. Different timing methods are applied according to the scenario, cost and demands for timing accuracy. Recently, the timing demands for some wireless scenarios have become increasingly urgent, like power IoT and auto-driving. However, due to the instability and complexity of radio link, the current methods can hardly meet the demands of high-precision and low cost simultaneously in mobile network. Here we propose a timing method over air interface based on physical layer signals (TAP). Periodic physical layer signals in both downlink and uplink channel are considered to reduce the impact of radio link instability on timing. We implemented the proposed method on an open source LTE software defined radio platform named OpenAirInterface and conducted a series of tests. Our tests prove that TAP can provide microsecond-level timing over the air interface, and it is more stable and precise than PTP. Further simulation shows that using TAP in 5G NR can improve the timing accuracy. INDEX TERMS Air interface, high-precision timing, IoT, physical layer, time synchronization.

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SDN/NFV Enhanced Time Synchronization in Packet Networks

Cited by 10 publications

References 28 publications

A Security Management Architecture for Time Synchronization Towards High Precision Networks

A Security Management Architecture for Time Synchronization Towards High Precision Networks

Networking and Computing in Biomechanical Research: Challenges and Directions

TAP: A High-Precision Network Timing Method Over Air Interface Based on Physical-Layer Signals

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