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For reducing energy consumption of sensor nodes in wireless sensor networks (WSNs), previous studies have proposed an approach in which some of the nodes are active, while the others are inoperative and the nodes switch between these two states as and when required to ensure full coverage of the area of interest. However, previous schemes for active node selection required the location of each sensor...
Localization is an important topic in wireless sensor networks because sensor nodes are randomly scattered over a region and they get connected into network on their own. Many localization algorithms have been proposed. These localization protocols can be divided into two categories: range-based and range-free. The range-based techniques use distance estimates or angle estimates to achieve fine accuracy...
Low cost and low power sensor concept is logically extended by sensor network idea. Large-scale intelligent systems, sensor networks based, can be developed integrating sensor networks and high level distributed computational paradigms as Grid Computing.
An efficient Medium Access Control (MAC) protocol is critical for the performance of a Wireless Sensor Network (WSN), especially in terms of energy consumption. In this short paper which presents our work-in-progress we discuss the efficiency of S-MAC, a well-known MAC protocol for WSNs, and propose an improvement on the protocol. Via an extensive simulation study considering the cases of both a simple...
How to provide the sensor nodes with the locations of mobile sinks with minimum energy consumption is a key issue to the performance of the geographic location based routing protocols. In this paper, we investigate three location update methods: Neighbour update (NUPD), Flooding update (FUPD) and Unicast update (UUPD).We get the analytical expression of energy consumption of each method. Based on...
As the need for applying wireless sensors to military and civil applications increases, the design of a routing protocol with fault tolerance becomes an important issue in wireless sensor networks. Previously proposed approaches were only concentrated on crash (or power) failures. This paper describes a routing scheme that not only handles crash failures but patterned faults and data processing errors...
In this paper we present an energy efficient centralized clustering algorithm and a quantitative study, in term of messages, of necessary energy to the cluster formation. The cluster formation cost allows to combine efficiently clustering algorithm and cluster-based communication protocols. The cluster formation cost plays an important role in wireless sensor networks life span. Our clustering algorithm...
Post-deployment adaptation of sensor networks is usually a necessity for several reasons, ranging from trivial deterioration of sensing hardware to unsatisfactory implementation of application logic. In this paper we present the architecture of VirtuS, a software component that can be incorporated into existing applications and remotely programmed to customize the behavior of sensor networks after...
Wireless sensor networks (WSNs) are commonly used for continuously monitoring applications. This paper investigates a base station assisted energy efficient routing for hierarchical clusters. The base station determines the number of clusters and the initial set of headset members. Moreover, instead of a single cluster head, a set of associates called a head-set manages the network clusters. The head-set...
The IEEE 802.11e is a new standard to support QoS in Wireless LAN (WLAN). A concept called transmission opportunity (TXOP) has been proposed in 802.11e to confine the maximum time duration that a station can be allowed to retain the channel after winning a contention or receiving a QoSpoll from the QAP. Multiple frames can be transmitted within one acquired TXOP without any additional contention or...
This paper considers a heterogeneous wireless sensor network consisting of a large number of energy constrained wireless sensor nodes and a connected subnetwork of resource-rich supernodes used for relaying sensor data to the user. We address the range assignment problem in this heterogeneous sensor network - selecting the transmission range for each sensor node such that a multihop communication...
The complexity within a Wireless Personal Area Network (WPAN) increases. Several technologies have to share the same radio spectrum. In this paper we take a look at the 2.4 GHz Industrial Scientific and Medical (ISM)-band. This paper discusses a method of selecting the best wireless channel within Wireless Local Area Network (WLAN) when several technologies could be used in the same WPAN range of...
Ubiquitous computing refers to making many computing devices available throughout the physical environment, while making them effectively invisible to the user. To further increase the applicability of ubiquitous computing, minimizing energy consumption and hardware cost are mandatory in real world applications. In this paper we present our platform prototype for ubiquitous computing, which has been...
The new IEEE 802.11 standard version - 802.11e, was developed in order to introduce mechanisms enabling handling of real time applications in the network. The first part of this paper contains short descriptions of the original and modified method of controlling access to the transmission channel. Using the further presented results of simulation tests it is possible to determine system operation...
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