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Deployment of sensors and routing inside an irregular region is one of the most fundamental challenges of Wireless Sensor Networks. The performance of an effective and efficient sensor network is highly related to the proper configuration and design of the network and effective communication between the sensors deployed. In real scenario, the area that needs to cover, may suffer from natural geographical...
Reducing energy consumption has been a recent focus of wireless sensor network research. Topology control explores the potential that a dense network has for energy savings. We propose that the sensor field be overlaid with a honeycomb virtual mesh based on a tessellation. Then with the help of greedy forwarding algorithm and perimeter forwarding algorithm, we can bypass a void or obstacles easily...
The multi-source and single-sink (MSSS) topology is defined as the network topology in wireless sensor networks (WSNs), where all of nodes can gather, receive and transmit data to the sink. We consider the problem of finding the joint optimal scheme with consideration of physical, medium access control (MAC), and network layers to maximize the network lifetime (NL) for the MSSS topology in the energy-constrained...
In a mobile ad hoc network, link failures and route changes occur frequently. Mistaking these events for congestion degrades TCP performance. Hence, TCP congestion control mechanisms should not react to such loss events. This paper deals with an enhancement of the congestion control mechanism, called TCP Adaptive RTO (TCP AR). This proposal relies on two basic concepts. First, it distinguishes routes...
A well-known approach to increase the resilience of mobile ad hoc networks (MANETs) and unstructured sensor networks is to ensure a network topology where there are at least k disjoint routes in the network between each pair of network nodes (usually called k-connectivity). Asymptotic analyses of node density requirements for k-connectivity have been considered in the literature. In this paper, we...
A wireless sensor network is often deployed for environment monitoring and event inspection. Among these applications, the sink of the network usually requires the data generated on each sensor node periodically, and such a network is called a data-gathering sensor network. In each round of the data gathering process, a sensor node sends its reading via a single-hop or multi-hop path to the sink....
The neighborhood information has been frequently used by protocols such as routing in sensor networks. Many methods have been proposed to protect such information in hostile environments. However, these methods can only protect neighbor relations between benign nodes. A compromised node can easily circumvent them and setup false neighbor relations with sensor nodes in many places, impacting the network...
In this paper we present WILLEM, a system for dynamic evacuation routing in buildings, using a wireless sensor network. Dynamic evacuation routing is the process of dynamically determining the fastest routes to the exits. The routes may be changed in case a fire occurs somewhere.We also present an algorithm for detecting congestions in corridors during evacuation, and a means of providing the people...
Geographic routing, based on greedy forwarding, relies on topology knowledge of the node's neighbors and achieves short path in the well-connected sensor networks. However, because of the absence of the topology knowledge outside of the neighborhood, the forwarding technique fails in the presence of void area. With the void-handling techniques, the geographic routing will experience non-short path...
Network coding is known to improve throughput by mixing information from different flows and conveying more information in each transmission. Recently some proposals have demonstrated the benefits of applying network coding to wireless networks with broadcast transmissions. It is expected that the opportunities for coding and the corresponding gains depend on the bit-rate chosen for determining routes...
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