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Sensor networks are a sensing, computing and communication infrastructure that are able to observe and respond to phenomena in the natural environment and in our physical and cyber infrastructure. In this paper, we investigate how the sensor network performs in the case when three events move with special movement path. We compare the simulation results for three cases: stationary, random and simple...
In this work, we investigate how WSN performs in the case when sink node moves using different radio models and metrics. We consider routing efficiency, delay and number of received packet metrics to evaluate the performance of WSN using AODV routing protocol, lattice topology, and TwoRayGround and Shadowing radio models. We evaluate the performance of WSN by simulations. The performance evaluation...
Wireless Sensor Networks (WSN) are a sensing, computing and communication infrastructure that are able to observe and respond to phenomena in the natural environment and in our physical and cyber infrastructure. The sensors themselves can range from small passive micro sensors to larger scale, controllable weather-sensing platforms. In this work, we investigate how the sensor network performs in the...
IEEE 802.15.4 is the emerging next generation wireless standard designed for low-rate wireless personal area networks (LR-WPAN), which suit wireless sensor networks applications. It attempts to provide a low cost, low power and short range wireless networking. The QoS is more challenging in heterogeneous wireless sensors networks, where a diverse mixture of sensors for monitoring temperature, pressure,...
Wireless Sensor Network is an adhoc network having nodes with constraints like less memory and processing capability. Nodes work without knowledge of their position in the network. After random deployment of nodes, some of the nodes are in critical position as they connect one group of sensor nodes to another. If these nodes are removed from the network it may lead to partitioning of network. Most...
Sensor networks are a sensing, computing and communication infrastructure that are able to observe and respond to phenomena in the natural environment and in our physical and cyber infrastructure. The sensors themselves can range from small passive micro-sensors to larger scale, controllable weather-sensing platforms. In order to simulate Wireless Sensor Networks (WSNs), we implemented a simulation...
Zigbee (IEEE 802.15.4) standard interconnects simple, low power and low processing capability wireless devices. The Zigbee devices facilitate numerous applications such as pervasive computing, national security, monitoring and control etc. An effective positioning of nodes in a ZigBee network is particularly important in improving the performance (e.g., throughput) of ZigBee networks. In the wireless...
More and more researches focus on the development of mobile wireless sensor networks (MWSNs) due to the favorable advantages and applications of MWSNs. However, there is not a comprehensive survey about the research issues on MWSNS for the state of art. In this paper, we survey the communication and data management issues on MWSNs and provide extensible research directions of MWSNs.
This paper presents an integrated approach to IP fast reroute (IPFRR) of both unicast and multicast paths in wireless mobile networks. A distinct feature of the proposed approach is that, instead of modifying existing routing protocols, it employs a soft handoff technique, i.e., temporarily installs pre-computed Loop Free Alternative Paths (LFAPs) until the co-existing routing protocol converges to...
One of the fundamental problems in sensor networks is to estimate and track the state of targets (or dynamic processes) of interest that evolve in the sensing field. Kalman filtering has been an effective algorithm for tracking dynamic processes for over four decades. Distributed Kalman Filtering (DKF) involves design of the information processing algorithm of a network of estimator agents with a...
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...
Current capabilities of mobile handheld devices introduce them to new roles that were not possible a few years ago. We consider using personal devices as relays to increase the wireless coverage in environments with limited infrastructure. To achieve this objective, the devices in the network need to cooperate in forwarding the packets of other devices. Incentive mechanisms are normally recommended...
In this work, the connectivity of a static wireless network is studied in the presence of overlaying mobile nodes. The impact of topology changes on the connectivity of an ad hoc wireless network is investigated, where topology changes occur due to node failures. To this end, first, the failure pattern of the static nodes is modeled, then the benefit of having self-organizing capabilities in a wireless...
This paper concerns multi-hop networks with multiple physical interfaces, and more particularly with multiple radios. For these networks, we investigate the advantage provided by the presence of multiple radios and specifically their impact on metrics such as link connectivity and network diameter and their resilience to link failures, and the length of shortest paths. Our results show that ldquosuper...
In this paper, we investigate the transmission-power assignment problem for k-connected mobile ad hoc networks (MANETs), the problem of optimizing the lifetime of a MANET at a given degree k of connectivity by minimizing power consumption. Our proposed solution is fully distributed and uses a model-based transmission power adaptation strategy based on model-predictive control. Specifically, a stochastic...
Neighbor discovery is a fundamental procedure that needs to be carried out in every wireless sensor network in order to enable communication capabilities. If nodes are mobile or multiple channels are used in the network, the same algorithm may be needed to be carried out several times during the network lifetime, consuming precious energy. In this paper we propose a way for optimizing a neighbor discovery...
This paper covers sensor networks, their different applications and problems encountered and in particular the routing problem which constitutes a major constraint in sensor networks today. The modified directional source aware routing protocol (DSAP) is presented. The goals intended were to build on the work already started on the modified DSAP algorithm for routing in a WSN network, try to find...
The growing popularity of location-enabled devices has driven the demand for more efficient and reliable geographical routing algorithms for mobile ad hoc networks (MANET) and wireless sensor networks. The characteristic of this network is that nodes exchange geographical location with neighbors, and no global topology or central management is required. This paper proposes a hybrid approach for routing...
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