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Many applications in industrial wireless sensor networks require time synchronization. Time synchronization is required for consistent distributed sensing and industrial control. In order to realize united time, the united time service system or the time server must be established. Based on industrial wireless sensor networks, information fusion automatically analyzes and monitors information under...
The International Society of Automation has recently released ISA100.11a as a standard for reliable and security application in industrial application, in addition to be compatible with existing wired and wireless networks. ISA100.11a, like WirelessHART, uses TDMA scheme in medium access layer to provide deterministic services. However ISA100.11a adopts the CSMA-CA mechanism with priorities for, e...
This paper presents a self-organizing robust clock synchronization algorithm based on the Reachback Firefly Algorithm, which is tailored for the use in wireless networks. We adapt a fault-tolerant algorithm from wired networks to cope with nodes deliberately feeding faulty clock readings into the system. The presented algorithm achieves a tight alignment of the firing phases of the non-faulty nodes,...
Time synchronization plays a key role in the wireless sensor networks (WSN).High precise time synchronization is all application foundation in distributed control systems. In order to realize united time, the united time service system or the time server must be established. Based on wireless sensor networks, information fusion automatically analyzes and monitors information under the certain criterion,...
Vehicular ad hoc networks (VANETs), similar to other distributed systems, often require a scalable time synchronization service enabling data consistency and coordination. In this paper, we propose a new time synchronization protocol for VANETs, which provides excellent scalability, accuracy and robustness for high mobility traffic scenarios. The new protocol, Converging Time Synchronization (CTS),...
Large-scale wireless sensor networks must be reliable, since they are intended to be operated without human intervention. Using well-understood building-blocks is one method of increasing confidence in the reliability of a sensor network design. In this paper, we use model-checking to analyze and characterize the flooding time synchronization protocol, a synchronization protocol that is distributed...
Broadcasting of digital video signals uses large spectral area. In order to reduce the cost, broadcasters are optimizing their radio network. They build single frequency network (SFN). To maintain efficient quality of service (QoS) to the end user, accurate time synchronization and frequency syntonization is needed between transmitter sites. This function is now fulfilled with local GPS slaved clocks...
In this paper we investigate the time and frequency synchronization as well as the sector and cell search for the 3GPP long term evolution (LTE) downlink. The proposed algorithms rely on the synchronization and cell-specific reference signals and are hence compliant to most recent 3GPP specifications. Time and (fractional) frequency offset coarse synchronization are performed in the time domain with...
This paper presents an implementation of a new time synchronization scheme for energy efficient wireless sensor networks (WSN). This scheme, called sliding clock synchronization (SCS) is able to compensate for static and dynamic drifts in the frequencies of crystals used in the WSN nodes. As power is a very scarce and critical resource in most WSN, a tight synchronization scheme can drastically reduce...
Time synchronization is essential in sensor network applications such as object tracking, consistent state updates, duplicate detection and temporal order delivery. In addition, reliability issues and fault tolerance in sophisticated sensor networks have become a critical area of research today. This paper proposes a lightweight fault tolerant time synchronization (LFTTS), an extension of fault tolerant...
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