Performance Analysis of Bandwidth Request Mechanism of rtPS and nrtPS in WiMAX Uplink Traffic

In recent years demand for high speed Internet access and multimedia service has increased enormously. Therefore, to meet these requirements WiMAX (Worldwide Interoperability for Microwave Access) has been introduced as a competitive alternative. In IEEE 802.16 standard also known as WiMAX quality of service is provided through both classification and scheduling of four different types of service classes. Because of wireless medium each class has its own bandwidth requirement, which has to be maintained to achieve desired level of QoS (Quality of Service). Extensive bandwidth allocation and QoS mechanisms are provided, but the details of scheduling and reservation management have not been specified in the standard and manufactures are given the open choice for implementation of their own algorithms to differentiate their equipment from other competitors in the market. Therefore, in this paper we present a model which processes the bandwidth requests from the subscriber stations to meet the demanded QoS of rtPS (real time Polling Service) and nrtPS (non-real time Polling Service) service classes in uplink traffic.