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Due to its modularity and scalability, modular multilevel converter is a promising topology for medium voltage applications, such as energy storage or motor drives. Because of the large number of modules, the wiring can become complex if the conventional star topology communication network is used. To solve this issue, a communication link that uses a ring topology to connect the central controller...
Future tactical communications involves high data rate best effort traffic working alongside real-time traffic for time-critical applications with hard deadlines. Unavailable bandwidth and/or untimely responses may lead to undesired or even catastrophic outcomes. Ethernet-based communication systems are one of the major tactical network standards due to the higher bandwidth, better utilization, and...
Time-Sensitive Networking (TSN) is becoming more important in automotive and industrial sectors. There is no clear strategy how to use TSN to improve and migrate the established real-time protocols without excluding legacy devices. This paper presents a realistic concept to integrate TSN into automation networks. We choose Sercos as a deterministic Industrial-Ethernet protocol to be extended with...
Communications within power converters is becoming increasingly important particularly with the evolution of multilevel converters having distributed control structures. In the not so distant past, communications were used primarily for reference point setting and monitoring. Currently however communication is taking on an integral role in the control of the power converters particularly those with...
This paper describes a trusted lightweight synchronisation protocol for wireless ad-hoc networks. The wireless ad-hoc network and wireless sensor networks is a large field of research. Their dynamic topologies make them difficult to synchronise (power consumption, slow convergence, accuracy). Moreover, these open networks are vulnerable to faulty nodes and attacks from malicious nodes. In this paper...
Gathering data over a dynamic topology is an issue in WSN. Radio links are unreliable due to changes in environmental conditions that induce drastic evolution of propagation conditions between nodes. This leads to a high dynamic connectivity and represents a big challenge for routing while maintaining the level of reliability required for the application. In this context, the synchronization of WSN...
This paper analyzes and evaluates the Distributed Node Consensus Protocol (DNCP), a state synchronization mechanism developed by the IETF Homenet working group. DNCP enables network function automation for home networks, which are growing in size and complexity. The basic mechanisms of DNCP are studied in this paper, including the state abstraction, synchronization process and keep-alive mechanism...
In distributed SDN architectures, the network is controlled by a cluster of multiple controllers. This distributed approach permits to meet the scalability and reliability requirements of large operational networks. Despite that, a logical centralized view of the network state should be guaranteed, enabling the simple development of network applications. Achieving a consistent network state requires...
The time synchronization of network will encounter a severe challenge due to the proliferation of scale in wireless sensor networks. In order to improve the precision of time synchronization in network, a time synchronization protocol based on frequency skew bid and dynamic topology (FBDT) is designed in the paper as well as realized on Embedded Linux System. To be able to effectively inhibit synchronization...
Time synchronization in wireless sensor networks is important for sensing services that require clock accuracy but use sensors without accurate hardware clocks. Pairwise synchronization is a common technique for two nodes to synchronize their clocks; a leading protocol that extends it across a larger network is AMTS. The challenge with AMTS and other protocols is that synchronization may incur significant...
This paper describes a novel distributed observer algorithm which uses augmented sliding mode control element for time synchronisation purpose in a wireless sensor networks (WSN). Time synchronisation is a prevalent and an important issue in the field of WSN. Local clocks on each nodes within any interconnected WSN should have exchanged messages with a common time reference. Referencing to a distinct(unsynchronised)...
We consider almost regulated output synchronization for directed heterogeneous networks where agents are nonlinear and non-introspective (i.e. agents have no access to their own states or outputs) in the presence of external disturbances. A purely decentralized time-invariant protocol based on a low-and-high gain method is designed for each agent to achieve almost regulated output synchronization...
This work addresses the integration of a cooperative robot control strategy with a wireless network simulated with OMNeT++. We use a consensus control strategy in a rendez-vous task, which relies on sharing information among a group of robots simulated in a MANET environment. We consider WiFi ad-hoc technology with an overlay TDMA protocol, based on loose synchronization, to minimize message collisions...
The broadcast nature of mobile wireless networks makes these types of networks more vulnerable to attacks by compromised or malicious nodes in the neighborhood of other nodes. In particular, a control plane attack against MAC layers can disrupt a node's association with its neighbor nodes and thereby cause the node to become isolated from the rest of the network. We focus on three potential MAC layer...
Network time synchronization using IEEE 1588 has tended to be applied to a wide network(i.e. a multi-hop network) with the aid of IEEE 1588 version 2 enhancement. However, designing a system to fulfill the desired synchronization accuracy is difficult because there are many factors that have an impact on multi-hop networks. Therefore, we developed a time synchronization simulator based on the network...
Topology control for wireless sensor networks is a thriving research field with no real-world adoption. This is partly due to the fact that a large number of approaches is focused on providing theoretical bounds. However, even more recent practical approaches are not being implemented. Integrating topology control with medium access control (MAC) and routing into a standard communication stack seems...
We consider almost regulated output synchronization for heterogeneous directed networks with external stochastic disturbances where agents are non-introspective (i.e. agents have no access to their own states or outputs). A purely decentralized time-invariant protocol based on a low-and-high gain method is designed for each agent to achieve almost regulated output synchronization while reducing the...
We consider almost regulated output synchronization for heterogeneous directed networks with external disturbances where agents are non-introspective (i.e. agents have no access to their own states or outputs). A purely decentralized time-invariant protocol based on a low-and-high gain method is designed for each agent to achieve almost regulated output synchronization while reducing the impact of...
There is an increasing need of synchronization and clock frequency distribution in core and access networks. Synchronous Ethernet (SyncE) is a technology that is able to distribute clock frequency over Ethernet networks, while keeping scalability and reduced costs. Software-Defined Networking (SDN) is another emerging technology that is changing the landscape of network management by separating the...
Global time synchronization is an important function that enables all devices in a network to have a unified time. In traditional wireless ad hoc networks, since the spectrum is always available, the global time synchronization process usually can be performed without any interruption. However, in cognitive radio (CR) ad hoc networks, the global time synchronization process among secondary users may...
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