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The following topics are dealt with: ad hoc and sensor networks; heterogeneous wireless, WLAN, and mobile networks; measurement performance analysis; network architectures, protocols, and routing; network management; and network security.
Secured communication in ad hoc wireless networks is primarily important, because the communication signals are openly available as they propagate through air. The lack of any central coordination and shared wireless medium makes them more vulnerable to attacks than wired networks. As nodes in ad hoc network join or leave dynamically, the efficient key management and encryption mechanism is required...
A wireless sensor network (WSN) consists of a large number of distributed sensors nodes, each of which is capable of performing computational operations, storage and communication capability. Extending network lifetime and energy efficiency are important objectives and challenges in wireless sensor networks. The nodes near the sink are more likely to use up their energy because they have to forward...
Minimization of the number of cluster heads in a wireless sensor network is a very important problem to reduce channel contention and to improve the efficiency of the algorithm when executed at the level of cluster-heads. In this paper, we propose an efficient method based on genetic algorithms (GAs) to solve a sensor network optimization problem. Long communication distances between sensors and a...
A lot of research has been done in finding range-based methods such as computing RSSI, time of arrival, angle of arrival or time difference of arrival and range-free methods such as centroid computation, DV-hop and approximate position in triangle, for localization in wireless sensor networks. Range-based methods estimate location more precisely than range-free methods. However, range-free methods...
Inexpensive sensors capable of significant computation and wireless communication with limited energy resources are available. Once deployed, the small sensor nodes are usually inaccessible to the user, and thus replacement of the energy source is not feasible. Hence, energy efficiency is a key design issue that needs to be enhanced in order to improve the life span of network. Several network layer...
In sensor networks communication by broadcast method involves many hazards, especially collision. Several MAC layer protocols have been proposed to resolve the problem of collision namely ARBP, where the best achieved success rate is 90%. We hereby propose a MAC protocol which achieves a greater success rate (Success rate is defined as the percentage of delivered packets at the source reaching the...
Energy is a valuable resource in wireless sensor networks (WSNs). The status of energy consumption should be continuously monitored after network deployment. The information about energy status can be used to early notify both sensor nodes and network deployers about resource depletion in some parts of the network. It can also be used to perform energy-efficient routing in WSNs. In this paper, we...
Opportunistic dissemination is a promising research domain, for more and more applications that need efficient information spreading in one area are emerging in vehicular ad-hoc networks (VANETs). The most important characteristic of vehicular networks is that they do not have a stable framework. The communication between vehicles mostly depends on the unexpected meeting. Some available data dissemination...
Providing low-cost broadband internet access in rural area use either IEEE 802.11/802.16 based optimized network topology. Even using directional antenna, the point-to-point links at a transmitting node suffer from Mix-Tx-Rx interference when simultaneously receiving on another link due the presence of side lobes. Existing 2P MAC protocol allocate channels to the links assuming the network topology...
This paper presents a novel transmission power assignment mechanism for on-body wireless links formed between severely energy-constrained wearable and implanted sensors. The objective is to develop a model based framework in which RF signal strength is predicted and is regulated at a reference value. In particular, the body movement has been modeled as a stochastic linear system and a quantized Linear...
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