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Wireless sensor networks (WSNs) detect and monitor the outside physical state by the sensor nodes organizing automatically. Clustering is a standard approach for achieving efficient and scalable performance in WSNs. In the applications of analysis topology discovering, geography routing, tracking and so forth, we need to resolve how to search for the boundary nodes and form the network boundary. Different...
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...
Enhancing lifetime of sensor nodes should be considered as the key design objective in Wireless Sensor Networks (WSN). A sensor node can only be equipped with a limited energy supply and it loses its energy during data communication. In some application scenarios, replenishment of energy resources might be impossible since the sensor nodes are distributed in remote environment. Hence, the nodes lose...
Clustering technique is an effective topology control approach which can improve the scalability and lifetime in wireless sensor networks (WSNs). LEACH is a classical clustering algorithm for low energy scheme, however, it still have some deficiencies. This paper studies LEACH protocol, and put an Improved LEACH protocol which has more reasonable set-up phase. In the cluster heads election phase,...
This work presents the organization and operation of a hopping sensor wireless network. It defines two decentralized algorithms for the discovery of isolated nodes, aggressive and smart discovery, to propagate base station connectivity. Both algorithms rely on the usage of hopping sensors on the boundary of a cluster, without prior topology information. We studied the efficiency of the algorithms...
Cluster formation and cluster head selection are important problems in sensor network applications and can drastically affect the network's communication energy dissipation. However, selecting of the cluster head is not easy in different environments which may have different characteristics. In our previous work, in order to deal with this problem, we proposed a power reduction algorithm for sensor...
Since the energy constraint is one of the most important restrictions in wireless sensor networks so the issue of energy balancing is essential for prolonging the network lifetime. Hence this problem has been considered as a main challenge in the research of scientific communities. In the recent papers many algorithms have been proposed for clustering on wireless sensor network to balance the energy...
Wireless Sensor Networks (WSNs) consist of small nodes with sensing, computation, and wireless communication capabilities. Wireless Sensor Network (WSN) is a promising data mining solution for precision agriculture. Instrumented with wireless sensors, it will become available to monitor the plants for real time, such as air temperature, soil water content, and nutrition stress. This real time information...
Clustering is a characteristic method in hierarchical topology controlling in wireless sensor networks. In the paper, we considered the rest of energy of every node in the process of clustering, and proposed an improved clustering algorithm for energy saving. This algorithm is realized by calculating the number of cluster head, choosing the optimal head, decreasing the energy consuming in cluster...
With an increased adoption of technologies like wireless sensor networks by real-world applications, dynamic network topologies are becoming the rule rather than the exception. Node mobility, however, introduces a range of problems (communication interference, path uncertainty, low quality of service and information loss, etc.) that are not handled well by periodically refreshing state information,...
Cluster-based topology is an energy-efficient topology control method in cognitive radio networks. The cluster-head node depletes energy faster than cluster-member node and the rotation of cluster-head node is needed to balance the energy consumption for the whole network. In this paper, EDCRN (Energy-Driven Cognitive Radio Network) is presented, which rotation energy threshold is estimated using...
In the past few years wireless sensor networks have received a greater interest in application such as disaster management, border protection, combat field reconnaissance and security surveillance. Wireless sensor networks are composed of large number of sensor nodes, which are limited in resources i.e. memory, energy and computation power. Wireless sensor networks (WSNs) facilitate monitoring and...
Wireless sensor networks are tiny devices with limited computation and energy capacities. For such devices, data transmission is a very energy-consuming operation. It thus becomes essential to increase the lifetime of a WSN by minimizing the number of bits sent by each device. One well known approach is to aggregate sensor data. Data aggregation is used to eliminate redundancy and minimize the number...
A reliable and efficient clustering algorithm in wireless sensor networks is proposed, which can allow the structured representation of a network topology. According to the residual energy, number of the neighbors, and centrality of each node, the algorithm uses fuzzy petri nets to select cluster head. The algorithm not only balances the energy load of each node, but also provides global reliability...
This paper proposes a decentralized algorithm for organizing an ad-hoc sensor network into clusters with directional antennas. The proposed autonomous clustering scheme aims to reduce the sensing redundancy and maintain sufficient sensing coverage and network connectivity in sensor networks. With directional antennas, random waiting timers, and local criterions, cluster performance may be substantially...
Wireless sensor network reliability is a growing concern as most of the sensors are expected to operate in an unattended manner for long periods of time. Therefore it is important that they should be able to tolerate faults and maintain a reasonable level of performance. To this end, in this paper we explore two De Bruijn and mesh based topologies and its fault tolerant routing scheme and a distributed...
Among many issues to be considered in designing an ad hoc wireless sensor network the key issue that stands out is to employ an efficient weighted topology discovery algorithm based upon certain node parameters. In the paper, we have described an algorithm for weighted topology discovery which uses colors based approach to partition the network in to clusters. Each cluster has a clusterhead. The nodes...
In WSNs, energy conservation is the primary goal, while throughput and fault tolerance are other important factor. According to wireless sensor network nodes energy consumption, hardware failure and communication factors, in this paper, an evolving network method based on complex network theory of small-world Kleinberg model is proposed, which uses long links and short links in partial view information...
Topology control is one of the most important parts of Wireless Sensor Networks (WSNs) which is the current hotspot of research and application. Comparing with the other traditional wireless networks, this paper firstly summarizes the specialties of typic WSNs, and then studies the recent representative clustering algorithms in this area by summing up their characteristics and application areas, posting...
Briefly introduced the status of MAC protocol for underwater acoustic communication, By improving the existing TopDisc algorithms, described the network topology needed by this paper and Proposed a suitable MAC layer protocol F-MAC for underwater communication. This protocol doesn't require synchronization and use the wasted time caused by RTS/CTS's handshake. The Simulation results show that, this...
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