DCSENSORNETS 2014 Abstracts

Full Papers
Paper Nr: 1

Spatial Distribution of Wireless Sensor Nodes in the Urban Environment


Vendula Hejlová

Abstract: Wireless sensor nodes are an important part of every wireless sensor network. If wireless sensor nodes have implemented or connected sensors, then they can be used for different types of measurements. These measurements can be carried out either in internal or external environment. Spatial distribution of sensor nodes in the urban environment is a crucial decision because on its basis the selected elements will be measured in the suggested places. It is necessary to choose localities where these measurements have the long term significance. Distribution of sensor nodes in the urban environment is determined by a lot of factors. These factors are related to technical parameters of nodes, terrain characteristics and parameters of measured elements. Distribution of sensor nodes is made on the basis of distribution algorithms or the sensor nodes are randomly spread to the area of interest. The graph theory is usually the background of distribution algorithms. This theory primarily does not take into account the characteristics of terrain and measured elements. This paper describes factors that influence the distribution of sensor nodes. The graphs that are used in the wireless sensor networks are described and the most suitable solution for implementing terrain characteristics is selected.

Paper Nr: 4

Fuzzy-based Routing Metrics Combination for RPL


Patrick Olivier Kamgueu, Emmanuel Nataf, Thomas Djotio and Olivier Festor

Abstract: This paper focused on the analysis of combining several metrics criteria for the implementation of RPL objective function, the new routing standard for the Internet of Things. The general problem is known as NP-complete, we propose the use of fuzzy inference system for finding a good trade-off among the various chosen metrics. Many routing solutions tend to favour increase on network lifetime, neglecting other network performance aspects. In this work, we consider : the expected number of transmission needed to successfully send a packet to its final destination, to meet reliability; the latency, to minimize end-to-end delay; in addition to the remaining power draw by node, for network lifetime extension. Implementation was done on Contiki and simulations were carried out on its emulator Cooja. Obtained results show improvements compared with those from the most common implementation, namely the one that uses ETX as unique routing metric.