Performance Study of Bandwidth Request Mechanisms in IEEE 802.16e Networks
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 specifications 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.