Sofiane Ouni
CRISTAL laboratry, Tunisia
Title: On delay and energy optimization for Real-Time Wireless Sensor Networks
Biography
Biography: Sofiane Ouni
Abstract
The wireless sensor networks (WSN) are projected to increase in next year’s. More and more distributed embedded applications need WSN as a communication infrastructure. As a new generation and specific applications, we are interested in Real-Time ones which include fire monitoring, border surveillance, medical care, highway traffic coordination, industrial applications, etc. This kind of applications are faced to tow major constraints mainly the Real-Time constraints related to communication delay deadlines and the energy saving related to the wireless sensor communication optimization. This problem of real-time WSN is treated differently if we consider a new designed system or if we use existing devices technology and standards. In the first case new sensor technologies are proposed for Real-time WSN. So, we made a review of MAC and routing protocols related to Real Time dealing with communication synchronization, clustering, sleeping time, network auto-organization and data gathering. We present a global approach and protocols which organizes the network on cluster tree that meets the real time constraints. This approach is applied for periodic sensing and also extended for event sensing like the fire detection in forest environment. In the second case, we are interested to extend existing standard like IEEE 802.15.4/Zigbee to handle real-time issues. It is to upgrade the standards to be efficient faced to communication delay and energy optimization. The main contributions are related to the dynamic auto-organization of the IEEE 802.15.4/zigbee network using communication load balancing strategy and path optimization. That is in the objective of delay optimization for real-time constraint satisfaction and energy conception sharing for energy constraints for a long network lifetime.