An implementation of IEEE 1588 protocol for IEEE 802.11 WLAN

Chen, Wu; Sun, Jianhua; Zhang, Lu; Liu, Xiang; Liang, Hong

doi:10.1007/s11276-015-0898-z

Cited by 17 publications

(13 citation statements)

References 29 publications

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“…The network situation is hard to forecast, this technique offered an adaptive filtering method that can change the clock recovery algorithm in the slave node rendering to the network condition. In [66] Kalman filter based a clock servo system is planned with software based PTP for WLAN.…”

Section: B Enhancement Approaches In Ieee 1588mentioning

confidence: 99%

“…Based on the results a new measurement setup that needs cheap hardware and upholds alike precision to other techniques. [66] Kalman filter based a clock servo system is planned with software based PTP for WLAN.…”

Section: Dante Devices and Two Tas3204evm Digitalmentioning

confidence: 99%

“…The working mechanism of PTP discussed in section 3 shows that the precondition of PTP appreciating precise clock synchronization is that the bidirectional delay among the master and the slave is symmetric. The prerequisites of PTP are difficult to meet in WLAN as compare to Ethernet due to the existence of asymmetric links [66]. The bidirectional delay in WLAN is asymmetric with large variance, which leads to the restraint of PTP incorporation to WLAN, and the asymmetric delay is primarily caused by the 802.11 back off mechanism.…”

Section: B Ptp Protocol For Ieee 80211 Wlanmentioning

confidence: 99%

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IEEE 1588 for Clock Synchronization in Industrial IoT and Related Applications: A Review on Contributing Technologies, Protocols and Enhancement Methodologies

et al. 2020

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Precise time synchronization becomes a vital constituent due to the rigorous needs of several time-sensitive applications. The clock synchronization protocol is one of the fundamental factors that can define the quality of communication. Our study starts with a brief discussion on the application domain of precise time synchronization and comes with an in-depth study of the synchronization with the main focus on the IEEE 1588 Precision Time Protocol (PTP). We have compared the well-known synchronization techniques and conclude that the PTP is the most appropriate answer to robust clock synchronization though challenges are there that requires thoughtful efforts and modification in the current version. The working mechanism and main components of the PTP network are discussed. We have established a testbench using commercially available devices and development boards to evaluate the PTP performance under different configurations. Major sources of synchronization error and other aspects contributing to precision are examined. This paper discussed numerous approaches that could enhance the performance of the PTP protocol. Structures for PTP based wireless clock synchronization required by advanced applications has also been discussed. In the end, paper focuses on the main industrial application areas in which PTP plays an important role, including WLAN, optical data centers, Smart grid, IEC 61850, etc. We conclude the paper by identifying the future trends and research directions for PTP based clock synchronization.

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Section: B Enhancement Approaches In Ieee 1588mentioning

confidence: 99%

Section: Dante Devices and Two Tas3204evm Digitalmentioning

confidence: 99%

Section: B Ptp Protocol For Ieee 80211 Wlanmentioning

confidence: 99%

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IEEE 1588 for Clock Synchronization in Industrial IoT and Related Applications: A Review on Contributing Technologies, Protocols and Enhancement Methodologies

et al. 2020

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“…The performance of in-band internal time synchronization depends on the channel activities, the density of the communicating nodes, and the condition of the networks. However, message delivery in such networks may sufer from a significant latency and jitter [45]- [47]. On the contrary, GNSS based out-of-band external synchronization techniques do not use the communication networks in its operation.…”

Section: A Justification Of the Feasibilitymentioning

confidence: 99%

GNSS Time Synchronization in Vehicular Ad-Hoc Networks: Benefits and Feasibility

Hasan

Feng

Tian

2018

IEEE Trans. Intell. Transport. Syst.

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Time synchronization is critical for the operation of distributed systems in networked environments. It is also demanded in vehicular ad-hoc networks (VANETs), which, as a special type of wireless networks, are becoming increasingly important for emerging cooperative intelligent transport systems. Global navigation satellite system (GNSS) is a proven technology to provide precise timing information in many distributed systems. It is well recognized to be the primary means for vehicle positioning and velocity determination in VANETs. However, GNSS-based time synchronization is not well understood for its role in the coordination of various tasks in VANETs. To address this issue, this paper examines the requirements, potential benefits, and feasibility of GNSS time synchronization in VANETs. The availability of GNSS time synchronization is characterized by almost 100% in our experiments in high-rise urban streets, where the availability of GNSS positioning solutions is only 80%. Experiments are also conducted to test the accuracy of time synchronization with 1-PPS signals output from consumergrade GNSS receivers. They have shown 30-ns synchronization accuracy between two receivers of different models. All these experimental results demonstrate the feasibility of GNSS time synchronization for stringent VANET applications.

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“…Academic researchers have proposed several wireless CS solutions [7]- [13]. SW TS based PTP solutions are easy to realize, but they provide relatively poor CS accuracy [7]- [9].…”

Section: Introductionmentioning

confidence: 99%

Hardware Efficient Clock Synchronization Across Wi-Fi and Ethernet-Based Network Using PTP

Aslam

Wei

Jiao

et al. 2022

IEEE Trans. Ind. Inf.

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Precision Time Protocol (PTP), a state-of-the-art clock synchronization protocol primarily designed for wired networks, has recently gained attention in the wireless community, due to the increased use of IEEE 802.11 Wireless Local Area Networks (WLAN) in real time distributed systems. However, all the existing WLAN based PTP designs either incorporate software Timestamping (TS) delivering poor clock synchronization accuracy, or Hardware (HW) TS providing better synchronization accuracy at the cost of a significant amount of HW overhead. Moreover, the performance of the existing PTP solutions is mostly evaluated in single-hop wireless networks, while the performance across wired and wireless networks is taken for granted. In this paper, a new Software Defined Radio (SDR) based approach to implement PTP is introduced and validated for IEEE 802.11 WLAN. Instead of using a dedicated HW clock, the solution utilizes the Timing Synchronization Function (TSF) clock, an existing clock in IEEE802.11 standard for synchronization between access point and WLAN stations. The performance of the proposed solution is first investigated within a single-hop WLAN and then across wired-wireless networks. Experimental results unveil that 90% of the absolute clock synchronization error falls within 1.4 µs.

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An implementation of IEEE 1588 protocol for IEEE 802.11 WLAN

Cited by 17 publications

References 29 publications

IEEE 1588 for Clock Synchronization in Industrial IoT and Related Applications: A Review on Contributing Technologies, Protocols and Enhancement Methodologies

IEEE 1588 for Clock Synchronization in Industrial IoT and Related Applications: A Review on Contributing Technologies, Protocols and Enhancement Methodologies

GNSS Time Synchronization in Vehicular Ad-Hoc Networks: Benefits and Feasibility

Hardware Efficient Clock Synchronization Across Wi-Fi and Ethernet-Based Network Using PTP

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