Improving throughput by On_Demand Bandwidth Allocation for WiMAX

Throughput is always an important element in both fixed and wireless networks. This paper presents ODBA (On_Demand Bandwidth Allocation) mechanism in WiMAX network. In order to solve the current issues faced in WiMAX network, and improve QoS demand, a new mechanism, ODBA is designed. Tt is an on demand bandwidth allocation mechanism for WiMAX. ODBA depends on the different characters of different service flow, to adopt different schedule algorithm. Further more, DL/UL direction of different service flow is scheduled by BS and SS respectively. The performance of ODBA mechanism and its behavior are evaluated, analyzed and compared with other algorithms and those without ODBA in WiMAX network. The performance has been simulated using OMNeT++ simulator in metrics of network throughput. The simulation results show that the ODBA mechanism has higher network performance than without ODBA in WiMAX network.