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Wireless Sensor Networks (WSNs) use mobile actuators for data gathering, which can effectively reduce the energy loss caused by data forwarding and prolong the network lifetime. However, mobile data gathering can't fundamentally change the fact that the energy of sensor nodes is limited. In this paper, to reduce the energy consumption due to data forwarding in wireless sensor networks, an emergency...
There are boundary nodes and a certain number of the isolated nodes in the wireless sensor network. If conducting the effective judgment and processing over them, the positioning errors of the entire network will be reduced. Based on principles and approaches of the graphic theory, the boundary nodes and isolated nodes will be judged. Through an analysis on the node density and the range and direction...
Ensuring efficient and fast data aggregation technique is the challenging task when it is considered for the large-scale wireless sensor network (WSN). The problems of presence of single sink, the distance between sink and cluster, as well as type of presence of dynamic task to be performed within different cluster is extremely difficult to address for reliable data aggregation technique in WSN. Therefore,...
How to measure and maintain connectivity is an important issue in ad hoc networks. A special case of such network is Wireless Sensor Networks (WSN), which are often deployed in harsh environments and also susceptible to a number of problems that may negatively affect the connectivity among the nodes. An additional factor that increases the cost of connectivity maintenance in ad hoc networks is when...
Recent advancements in wireless communications and electronics have enabled the development of low cost sensor networks. The sensor networks can be used in various applications such as military, health, home. Depending on the application researches are resolving different technical issues. In some applications, a certain segment of the network becomes energy constrained before the remaining network...
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...
The mobility of nodes with a purpose called as robotic-mobility is used for replenishing energy to strategic military applications. Assuming a CDS based backbone in place, we give a technique of maintaining the location of mobile node for a given topology setting. We show that using a weighted CDS reduces the maintenance of location updates for mobile node. The complexity of our mobile-node maintanence...
The traditional Wireless Sensor Network (WSN) with fixed nodes canpsilat server the newly demand any more. For adapting to the future sensor network, we proposed a novel Multi-tier mobile network architecture; studied the problems of instability of network and high-fraction of event loss caused by the mobility of tiered nodes and mobile Fusion (F) node routes for data collection. For computing mobile...
The hybrid hierarchical architecture (HHA) represents a particular case of wireless hybrid network, where sensor nodes transmit their samples to an infrastructure network through multiple hops. In the HHA, gateway terminals implementing both cellular and infrastructure-less air interfaces, allow integration of the two separate paradigms characterising the wireless sensor network (WSN) and the cellular...
Wireless sensor networks can monitor different types of physical phenomena and are able to provide a diverse set of context data to interested clients. Allowing mobile pervasive computing devices to access such data requires solutions for routing messages between mobile devices and the static sensor network. This paper presents a novel approach that addresses this problem with the help of symbolic...
The following topics are dealt with: IP network security; wireless security; network topology; power line communication; intelligent transportation; cryptography; P2P streaming; wireless communication; wireless channel; network traffic; routing protocol; security protocols; resource management; ad hoc network; wireless sensor network; MAC protocol; power control; QoS; scheduling; coding; modulation;...
Sink mobility has become an increasingly important requirement of various sensor network applications. Handling such mobile sink conditions brings new challenges to large-scale sensor networking. This investigation proposed a hybrid-structure routing protocol (HSRP) that combines the benefits of grid-based and cluster-based structures. Grid-based structure is designed to solve the cluster head selection...
In mobility-centric environments, wireless sensor networks are designed to accommodate energy efficiency, dynamic self-organization and mobility. In typical applications of wireless sensor networks, fixed sensor nodes are mixed with mobile sensor nodes in "hot areas". Also, as they move, network topology needs to be reconstructed by reacting upon the mobility of sensor nodes quickly. In...
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