WiMAX (Worldwide Interoperability for Microwave Access) is the IEEE 802.16 standards-based wireless technology that provides fixed and mobile Internet access for Metropolitan
Area Networks (MAN). The IEEE 802.16 std. includes medium access control (MAC) and physical (PHY) layer pecifications and is consider to be a promising technology. Bandwidth reservation is employed to provide quality of service (QoS) to guarantee different services specified in the standard. A bandwidth request/grant scheme is defined in the IEEE 802.16 standard. There are two types of
bandwidth request (BR) mechanisms, i.e., polling
and contention resolution, which are defined in the
standard. As specified, connections belonging to
scheduling classes of extended real-time polling
service, non-real-time polling service, and best effort
have options to make BRs via both mechanisms,
depending on the scheduling decision made by the
base station (BS). This paper attempts the
comparative study of BR mechanisms for different
service classes defined in the standard
