Today in the wireless network field, WiMAX (Worldwide interoperability for Microwave Access) has emerged out as one of the promising networking technologies. In order to compete with the existing wireless technologies like Wi-Fi and Bluetooth (IEEE 802.15), WiMAX has to promise cost efficiency and better Quality of Service (QoS). The Adaptive source provision system is proposed to control traffic rate and ensure load balancing in the WiMAX network. The proposed approach considers relay station in the network. When there is an arrival of new users in the network, its data rate is computed and then compared with the data rate of RS.