The new IEEE 802.15.4 shows promise to bring networking in to out lives. Unlike other standard targeting high-or-moderate-data-rate applications, IEEE 802.15.4 is global standard designed for low data rate, low power consumption and Low cost application. This standard will bring many simple, originally Standalone devices in a networks and thus not only open door to an enormous number of new applications, It add's new values to existing applications. One class of application investigated for the IEEE 802.15.4 LR-WPAN (Low Data Rate-Wireless Personal Area Network) standard is wireless for monitoring and control applications. In this paper an analytical performance model is provided for an IEEE 802.15.4 network with a star topology. We first carry out a saturation throughput analysis of the system; i.e., it is assumed that each sensor has an infinite backlog of packets and the throughput of the system is sought. After an analysis of the CSMA/CA MAC that is employed in the standard, and after making a certain decoupling approximation, We identify an enabled Markov renewal process, whose analysis yields a fixed point equation. Solution of this fixed point equation yields certain quantities from which the throughput can be calculated.

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Star Topology