Arash Nasiri Eghbali

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In wireless sensor networks, time synchronization is a critical problem. In this paper, we propose SLTP, a Scalable Lightweight Time-synchronization Protocol for wireless sensor networks. By using passive clustering and linear regression SLTP can reduce the energy consumption of network nodes and also decrease the overhead of creating and maintaining the(More)
Directed diffusion (DD) is a data-centric routing protocol based on purely local interactions between individual network nodes. This protocol uses application-specific context for data aggregation and dissemination. Therefore, it can be completely matched to the application requirements in a large distributed sensor network. Many work have been recently(More)
—One of the most important challenges we must cope with in wireless sensor networks is the energy problem. In these networks, nodes have no unique addresses and are identified by the data gathered by them. Therefore routing is not straightforward considering energy constraints. Directed Diffusion is a data-centric routing protocol design for WSNs. Although(More)
Directed Diffusion (DD) uses data aggregation to suppress data overhead however there is no guarantee that paths from nearby sources join after a few hops. In this paper, an efficient data-gathering protocol (EDAP) is proposed to address this problem by using a Virtual Sink (VS) node nearby the sources, which plays the role of sink node and broadcasts local(More)
Directed diffusion (DD), uses mechanisms such as data aggregation and in-network processing to suppress the additional data overhead however there is no guarantee that paths from nearby sources join after a few hops. In cases where sensed event is spread geographically, the probability of such combination is reduced. Another problem arises in presence of(More)
Directed diffusion is a data-centric routing protocol used in wireless sensor networks and uses only local interaction between neighbor nodes. One of the problems of this approach is the mechanism used for routing selection which mostly, leads to select the shortest path between sinks and sources. In this case the nodes in the shortest path will fail after(More)
Wireless sensor networks are new generation of networks and therefore they encounter a number of challenges. These networks are employed in a range of applications such as collecting environmental information or reporting an event. The main difference between sensor networks with other networks lies in the fact that the former are data-centric and(More)
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