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We investigated the performance of the IEEE 802.1AS time synchronization protocol and its usage in in-vehicle networks by assessing the precise time synchronization mechanisms, such as offset correction, rate correction and the automatic optimal sync message period. In particular, this paper presents a method for adjusting the optimal synchronization message period to achieve high-precision time synchronization...
The plug-in of nodes in already synchronized Wireless Sensor Network (WSN) can perturb the synchronization accuracy. In the case of the plug-in of one node, the consensus based synchronization algorithm permits to deploy the local interactions among nodes, and, as a consequence, to detect and ignore the Non Synchronized Node (NSN). In the case of multiple nodes, the detection of NSNs can be misstated...
The emergence of Wireless Sensor Networks (WSNs) applications such as localizing, tracking, surveillance, speedometers, and so on, synchronizing sensor motes' clocks is essential in WSNs. Thus, many time synchronization protocols are proposed in recent decade to get network wide synchronization. Each of those protocols strives to get a good precision in different ways. This paper aims to review some...
The evolution of industrial communication inexorably moves towards Ethernet based networks. One important reason for using Ethernet at the shop floor is to participate on the continuous advancements of standard Ethernet. In contradistinction to the star topology, used commonly in home and office networks, in the industrial automation most common network structure is line. It is due to the fact that...
Impulse-Radio Ultra Wideband (IR-UWB) is a promising technology for indoor localization due to its robustness against multipath interference. In this paper, to deal with the synchronization requirement among anchors in traditional time-difference-of-arrival (TDOA) localization, which is difficult to achieve, an asynchronous time-difference-of-arrival (TDOA) localization method is proposed. The theoretical...
This paper proposes an approach based on query expansion and node aggregation under the unstructured peer-to-peer network. This approach can find the relationships of keywords and nodes automatically, then record the information on each local node and update it continuously. In the future retrieval, the purpose of keywords relationship is to increase hit goals, the purpose of similar nodes aggregation...
In peer-to-peer (P2P) applications, a scalable group of multiple peer processes (peers) are required to cooperate with each other. In this paper, we discuss a two-layered heterogeneous hybrid time (THHT) protocol which takes advantage of the linear time (LT) and physical time (PT) to causally order messages in a scalable heterogeneous group. In a heterogeneous type of group, the clock accuracy of...
In peer-to-peer (P2P) applications, a group of multiple peer processes (peers) are required to cooperate with each other. In this paper, we discuss a heterogeneous hybrid time group communication (HHT) protocol which takes advantage of the linear time (LT) and physical time (PT) to causally order messages in a scalable heterogeneous group. It depends on accuracy of each physical clock and minimum...
In peer-to-peer (P2P) applications, a group of multiple peer processes (peers) are required to cooperate with each other in a distributed manner. Messages sent by peers have to be causally delivered to every peer in a group. Due to the message overhead O(n) for the number n of peers, the vector clock cannot be used to causally deliver messages in a scalable group. On the other hand, the linear clock...
In distributed peer-to-peer (P2P) applications, a group of multiple peer processes (peers) are required to cooperate with each other. Messages sent by peers have to be causally delivered. In this paper, we discuss a scalable group communication protocol for a group of multiple peers in P2P overlay networks. Due to the message overhead O(n) for the number n of peers, the vector clock cannot be used...
Peer-to-Peer (P2P) systems receive growing acceptance, and the need of identifying the states of nodes appears increasingly in a variety of P2P based applications. In this paper, we propose Hermes, an algorithm to efficiently spread and maintain the states of all nodes in large scale systems. Hermes uses an improved push & pull style gossip process to spread the states of all nodes, and proposes...
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