Wireless sensor networks are adapted to monitoring applications. Specific solutions have to be developed for industrial environments in order to deal with the harsh radio conditions and the QoS (quality of service) requirements of industrial applications. In this paper, we present the main protocols used in the OCARI project, and we describe their use of cross-layering techniques. We show how it enables us to improve the performance of the network. For each protocol, we give a performance evaluation of its main characteristic.

We address the problem of estimating the remaining energy of a node battery in wireless sensor networks. To solve this issue, we provide an on-line battery model that requires limited memory and low computational complexity. The accuracy of our battery model is verified by simulation.

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