The cluster-based technique is one of the good perspectives to reduce energy consumption in Wireless Sensor Networks (WSNs). The lifetime of WSNs is maximized by using the uniform cluster location and balancing the network load between the clusters. This paper presents a simulation analysis of how the maximum number of retransmissions impacts the reliability of data transmission, the energy consumption of the nodes and the end-to-end communication delay in the IEEE 802.15.4/ZigBee beacon-enabled cluster-tree WSNs. The simulation model is developed using Riverbed Modeler academic edition 17.5 to carry out the analysis of cluster tree WSNs. The configuration parameters of the network are obtained directly from the Time Division Cluster Scheduling (TDCS) tool. The analytical methods, simulation model and system designs will be easily configured by using IEEE 802.15.4/ZigBee cluster-tree WSN. For the number of retransmission is 4 the reliability of data transmission is 99.4% and the energy consumption of node is 73.6 Joules. Prior to network deployment, for a given application the required Quality of Service (QoS) can be obtained by using the simulation model developed in this paper. The collision of the IEEE 802.15.4 parameters on the delay bound and throughput guaranteed by a guaranteed time slot (GTS) allocation can be analyzed using this model developed.
