Abstract: The IEEE 802.15.4 protocol has the ability to support low rate Wireless Personal Area Networks (WPANs) with very low power consumption time-sensitive. In this study, researchers have analyzed the effect of size of the network, duty cycle, beacon fraction and transmitted power on the value propagation between nodes in wireless sensor network that uses IEEE 802.15.4 MAC. Specifically, researchers have used OMNeT++ simulator and Castalia to study the impact of varying these parameters on value propagation between nodes.