Enhanced Precision Time Synchronization for Wireless Sensor Networks

Cho, Hyuntae; Kim, Jong-Deok; Baek, Yunju

doi:10.3390/s110807625

Cited by 15 publications

(16 citation statements)

References 19 publications

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“…TPSN follows the rules specified in (Ganeriwal et al 2003), focused on tree-based scenarios. Under these circumstances (different from our study focused on the IEEE 802.15.5 standard), the method in (Cho et al 2011) slightly improves the synchronization accuracy under ideal conditions at the expense of increasing the computational complexity. Furthermore, this algorithm does not consider the recovery of synchronization messages in case of loss, therefore worsening the synchronization precision on real implementations.…”

Section: Related Studymentioning

confidence: 65%

“…In a recent article (Cho et al 2011), a synchronization method was presented and evaluated for a grid topology, a particular scenario of the mesh arrangement. This algorithm improves the Light-Weight Time Synchronization (LWTS) schemes, removing some of the duplicated broadcast messages occurring in the flooding phases of the topology construction, children discovery, and synchronization operation.…”

Section: Related Studymentioning

confidence: 99%

“…This algorithm improves the Light-Weight Time Synchronization (LWTS) schemes, removing some of the duplicated broadcast messages occurring in the flooding phases of the topology construction, children discovery, and synchronization operation. In (Cho et al 2011), TPSN and the new LWTS algorithm are compared using Carrier Sense Multiple Access (CSMA) for the MAC. TPSN follows the rules specified in (Ganeriwal et al 2003), focused on tree-based scenarios.…”

Section: Related Studymentioning

confidence: 99%

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On the synchronization of IEEE 802.15.5 wireless mesh sensor networks: Shortcomings and improvements

García-Sánchez

García‐Sánchez

Rodenas-Herráiz

2012

J Wireless Com Network

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As part of the recent IEEE 802.15.5 wireless mesh sensor networks (WMSN) standard, Synchronous Energy Saving (SES) is planned to provide energy savings to scheduled communications with strict temporal requirements that, a priori, facilitate the development of delay-sensitive applications. It is accomplished by means of different mechanisms, among which we highlight a straightforward synchronization process. However, the SES synchronization scheme introduces variable delays in the dissemination of information and reduces the lifetime of the nodes and the entire network significantly, thus limiting the full exploitation of SES. This article presents a new synchronization approach, that we call High-Performance Synchronization Algorithm for wireless mesh sensor networks (HIPESYN), which is adapted to the IEEE 802.15.5 standard for synchronous communications. HIPESYN supports intensive bandwidth applications in a much better way than with the original design. The proposed algorithm is also thoroughly evaluated and its results carefully discussed.

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Section: Related Studymentioning

confidence: 65%

Section: Related Studymentioning

confidence: 99%

Section: Related Studymentioning

confidence: 99%

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On the synchronization of IEEE 802.15.5 wireless mesh sensor networks: Shortcomings and improvements

García-Sánchez

García‐Sánchez

Rodenas-Herráiz

2012

J Wireless Com Network

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“…For instance, control command depends on synchronous monitoring data of each node in various networks [1][2][3]. Therefore, clock synchronization plays an important role in these systems [4][5].…”

Section: Introductionmentioning

confidence: 99%

Tests of IEEE 1588-based synchronization system in substation

Liu

Zhang

et al. 2015

Teh. vjesn.

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Original scientific paper As a synchronization method, IEEE1588 standard has been applied in substation, it should be tested and verified ensure synchronization accuracy and node interoperability. A comprehensive testing method for the IEEE1588 is proposed in this paper. Furthermore, IEEE1588 clock testing platform is built to support the proposed testing method. Based on the analysis of the clock synchronization error and the performance testing principle method, the accuracy and stability of master clock and slave clock were evaluated. Secondly, the conformance testing to adopt performance response was achieved by designed specific case, based on the above, and then to analyse the conformance implementation details. According to testing requirements, test bed designed. Finally, the experiment based on substation devices was carried out using the IEEE1588 clock testing platform. The feasibility of the proposed methods was further verified with the testing results. Keywords: conformance testing; device under test (DUT); IEEE 1588; performance testing; precision time synchronization; substation Testovi sinkronizacijskog sustava u trafostanici utemeljeni na IEEE 1588Izvorni znanstveni članak Kao metoda sinkronizacije, IEEE1588 norma je primijenjena u trafostanici, to bi trebalo osigurati ispitanu i provjerenu sinkronizacijku točnost i čvora interoperabilnosti. Metoda sveobuhvatnog testiranja za IEEE1588 se predlaže u ovom radu. Nadalje, IEEE1588 platforma testiranja ure izgrađena je kao podrška predložene metode ispitivanja. Na temelju analize sinkronizacije pogreške ure i metode ispitivanja načela značajke, ocjenjene su točnost i stabilnost glavne ure i pomoćne ure. Drugo, ispitivanje usklađeno s normom za usvajanje odziva značajke je postignuto dizajniranjem konkretnog slučaju, na osnovi navedenog, a potom analizirati pojedinosti provedbe sukladnosti. Prema zahtjevima ispitivanja, dizajnirana je testna osnovna ploča. Konačno, pokus utemeljen na uređajima transfostanice proveden je uporabom IEEE1588 platforme testiranja ure. Izvedivost predloženih metoda dodatno je potvrđena s rezultatima testiranja.

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“…The study showed that the system is able to detect all the failures injected on the master under different conditions and correctly identify failures on slaves with a high probability. Cho et al [11] proposed enhanced precision time synchronization for wireless sensor networks (WSNs). Valls et al [12] proposed an enhanced middleware for real-time reconfiguration of service-oriented distributed real-time systems.…”

mentioning

confidence: 99%

A Novel Algorithm for Establishing a Balanced Synchronization Hierarchy with Spare Masters (BSHSM) for the IEEE 1588 Precision Time Protocol

Tien

Rhee

2017

Energies

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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++ v4.6 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.Keywords: precision time protocol (PTP); best master clock (BMC) algorithm; balanced synchronization hierarchy with spare masters (BSHSM) algorithm; fast recovery mechanism

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Enhanced Precision Time Synchronization for Wireless Sensor Networks

Cited by 15 publications

References 19 publications

On the synchronization of IEEE 802.15.5 wireless mesh sensor networks: Shortcomings and improvements

On the synchronization of IEEE 802.15.5 wireless mesh sensor networks: Shortcomings and improvements

Tests of IEEE 1588-based synchronization system in substation

A Novel Algorithm for Establishing a Balanced Synchronization Hierarchy with Spare Masters (BSHSM) for the IEEE 1588 Precision Time Protocol

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