Energy Consumption of Key Distribution in 802.15.4 Beacon Enabled Cluster with Sleep Management

In this Chapter, we analyze performance of the 802.15.4 cluster in beacon enabled mode under the presence of key exchange protocol. We assume that all nodes are applying power management technique based on the constant event sensing reliability required by the coordinator. Power management generates random sleep times by every node which in aver-age fairly distributes the sensing load among the nodes. Key exchange is initiated by cluster coordinator after some given number of sensing packets have been received by the coordinator. We develop analytical model of key exchange integrated into the cluster’s sensing function and evaluate the impact of frequency of key exchange on the cluster’s energy consumption. In order to penetrate the market with cost-effective solutions for WSNs we need standardized low-cost, low-power and short-range communication Low Rate Wireless Personal Area Network (LR-WPAN) technology. Importan