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The Wireless Sensor Networks (WSN) particularly for real time applications raise fundamental problems
for the scientific community. These problems are related to the limit of energy resource and the real time
constraints on the communication delay. The well functioning of such networks depends mainly on the
network lifetime result of nodes energies and the communication delay which should meet the required
deadlines. Thus, the well design of RealTime Wireless Sensor Networks must be with the prediction of
the energy consumption and the communication delay. Therefore, this paper propose an analytical model
to predict the lifetime and the delay in IEEE 802.15.4/ZigBee WSN. Our proposed model is based on
realistic assumptions. It considers the most important network features such as idle times from the
Backoff, overhearing and interferences by collisions and transmission errors. Compared to simulation
results and other analytical approaches, our model gives a reliable lifetime and delay prediction.
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