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In wireless sensor networks (WSNs), the nodes are usually powered by batteries with limited capacities, which has become one of the main challenges to the wide deployment of WSN-based applications. The overall network lifetime, which is usually determined by the node with the shortest lifetime because of the unbalanced energy consumption, becomes a major issue. Aiming at this, we consider the optimization...
In this paper, we propose a new Compression Cluster-based scheme in a Spatial Correlated Region (CC SCR) for event-driven applications in wireless sensor networks. The main idea behind our proposal is to exploit the spatial correlation of such networks in order to reduce the size of the data packets that will be sent by means of data compression. The proposed clustering scheme is based on selecting...
Network-wide broadcasting and multicasting are two important routing schemes used in group communications. In network-wide broadcasting, generated packets at the source node are distributed to all nodes in the network, while multicasting delivers the packets only to a subset of the nodes by creating and maintaining a data dissemination structure. Due to the overhead in multicasting, in certain situations,...
This paper proposes a new Random Channel Selection scheme with probabilistic backoff, called RCS, for a class of multi-channel MAC protocols in heavy loads WSNs to tackle the channel conflict problem. By adopting RCS, a node can reduce the probability of selecting a busy channel for data communication. Therefore, RCS can avoid data packet collision, and thus conserve more energy to extend the lifetime...
An optimal resource control mechanism for a multiprocessor, multi-radio node architecture is proposed. To achieve our objective, a constrained semi-Markov decision problem is formulated, which not only provides optimal resource control but also meets quality of service demands imposed by application. For each sensed event, the desired energy efficiency and performance tradeoff is achieved by the optimal...
Energy efficiency and long network lifetime has been of a great interest in wireless sensor networks. In addition to delivering data to the base station, a routing protocol must be energy efficient. An efficient routing technique is known as hierarchical routing based on clustering. In this paper, wireless sensor network is considered with a mobile base station. After clustering the nodes and selecting...
Wireless Sensor Networks (WSNs) can be used to monitor hazardous and inaccessible areas. The WSN is composed of several nodes each provided with its separated power supply, e.g. battery. Working in hardly accessible places it is preferable to assure the adoption of the minimum transmission power in order to prolong as much as possible the WSN's lifetime. Though, we have to keep in mind that the reliability...
In this paper, we show how spatial correlation in data can be exploited to reduce energy consumption in a wireless sensor network. We analytically characterize the optimal cluster size, and then use a greedy clustering algorithm to study approximate solutions to the optimal data gathering problem.
Wireless Sensor Network (WSN) is a novel information acquiring and processing technology. To increase the life of WSN, each sensor node has to transmit the queuing data efficiently and conserve its energy, how to share the query of transmission for the collected information of sensor nodes becomes a new problem. Based on polling scheme with the unique characteristics of contention-free of access,...
Motivated by the highly dynamic topology in wireless sensor networks with asynchronous duty cycle, and its impact on reliable data delivery, we propose a light-weight opportunistic forwarding (LWOF) scheme. Differing from other recently proposed schemes, LWOF neither employs historical network information nor a contention process to select a forwarder prior to data transmission. It takes advantage...
Data communication represents the greatest energy cost of wireless sensor networks. Both MAC and network layers of the protocol stack are responsible for data communication in these networks. This work proposes the Receiver- based Medium Access Control (Rb-MAC) protocol to be used in a combined solution with a receiver-based routing scheme. The main advantage of combining receiver-based MAC and routing...
In large scale Internet network, the research in area of event detection and report publish/subscribe communications paradigm is being progressed. Data-centric is the basic characteristic of data transmission mode of the publish/subscribe communications paradigm. Such characteristic coincides with the wireless sensor network. The publish/subscribe communications paradigm performs task in manner of...
This paper deals with the analysis of distortion introduced in the real time reconstruction of a spatio-temporally correlated field by a sink node. The field is measured by a randomly deployed network of heterogeneous sensors and the data is sent to the sink node. For the sake of analysis, we assume that the network consists of multiple clusters consisting of two types of nodes: cluster head and cluster...
The development of the Low-Rate Wireless Sensor Network(LR-WSN)is matures gradually and the characteristics of LR-WSN included low date rate, low power consumption and low volume...etc. For the application of emergency cases, like calamity detection of the mudflows and landslides, according to earthquake sounds and the humidity of the soil, the detection sensors is in very low date rate state in most...
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