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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...
Directed Acyclic Graphs (DAGs), rooted at popular/default destinations, have emerged as a preferred mechanism to provide IPv6 routing functionality in large scale low power and lossy networks, that include wireless sensor networks and those based on power line communication. A DAG maintains its acyclic nature by requiring that each DAG node must have a higher 'rank' than any of its DAG parents. While...
The research is centered on sensor networks with two types of nodes. The low end nodes are simple and low cost, while the high end nodes are costly but provide significantly more processing power. In this type of sensor networks, the low end nodes are clustered and report to a high end node, which is turn uses a network backbone to send data to a base station. In this research we have configured a...
Wireless sensor networks are increasingly used for remote monitoring, fire detection, emergency response. Such networks are equipped with small devices powered by batteries and designed to be operated for years. They are often based on the ZigBee standard which defines low power and low data rate protocols. As network size and data rates increase, congestion arises as a problem in these networks,...
The IEEE 802.15.4 and ZigBee protocol stack offers great potentials for ubiquitous and pervasive computing, namely for wireless sensor networks. However, there are still some open and ambiguous issues that turn its practical use a challenging task. One of those issues is the study of low power consumption of sensor device, which is the biggest issue in sensor network, still has many unresolved issues...
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