Abstract
In the past few years the latest wireless technologies and progress in chip manufacturing have allowed moving to the practical development and implementation of a new class of distributed communication systems – sensor networks.
Wireless sensor networks (WSN) consist of miniature computationally and communication devices – motes, or sensors [1]. Mote is a board that usually has a size of no more than one cubic inch. Flash memory and operational, digital to analog and analog to digital converters, radio frequency transceiver, power supply and sensors placed on board.
Figure 1 – Appearance of a mote
Nodes are usually located randomly throughout the observation. Each of them can collect the data and knows the route of data back to the central node, the end-user by the shortest route. Example of calculating the route is shown in Figure 2 [4].
Figure 2 - Example of calculating the route (49 frames, 100 ms delay, 7 iterations, size 150 Kb)
Among the most well–known wireless technologies several can be distinguished: Wi–Fi, Wi–Max, Bluetooth, Wireless USB and relatively new technology – ZigBee, which was originally developed with a focus on industrial applications.
An aim of this work was to simulate the multiple sensor networks in the environment NS2 (Network Simulator 2). Basic parameters of scenarios are presented in Figure 3.
Figure 3 - Basic parameters of simulation scenarios
As the result, sensor networks have been constructed on the basis of two topologies: star and tree [10]. The results obtained in the NAM visualizer are shown in Figure 4.
Figure 4 - Simulation results
Conclution
With the development of computer technology and communication the era of wireless networks and distributed computing has begun. In a few more years wireless technology will be connected to a large number of digital devices, making information technology in pervasive and ubiquitous power era of the information society.
During the master's work more in–depth studies of mobile sensor networks will be carried out using parallel simulation environments. This will help quickly analyze the data received from the simulation of the large sensor networks, consisting of thousands of nodes.
This master's work is not yet complete. Final completion: December 2014. Full text of the work and materials on the topic can be obtained from the author or his manager after that date.
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