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The IEEE 802.16 standard is considered to be one of the most promising technologies. Bandwidth reservation is employed to provide Quality of Service (QoS)-guaranteeing services. A request/grant scheme is defined in the IEEE 802.16 standard. There are two types of Bandwidth Request (BR) mechanisms, i.e., unicast 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). However, most research assumes that only one of them is available and do not take both of them into account.
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