Networking together hundreds or thousands of cheap microsensor nodes allows users to accurately monitor a remote environment by intelligently combining the data from the individual nodes. These networks require robust wireless communication protocols that are energy efficient and provide low latency. In this paper, we develop and analyze a new concept in the Optimal Energy LEACH Protocol (OELP), a protocol architecture for microsensor networks that combines the ideas of energy-efficient cluster-based routing and media access together with application-specific data aggregation to achieve excellent performance in terms of system lifetime. The new approach is studying and analyzing the effect of fixed clustering and event-driven on the network lifetime. Fixed clustering OELP (FCOELP) includes a new, distributed cluster formation technique that enables self-organization of large numbers of nodes, algorithms for adapting clusters and rotating cluster head positions to distribute the energy load among all the nodes evenly. The results show that fixed-clustering OELP increases network lifetime by a factor of 50% approximately compared with previous related work researches.