Abstract- The demand for high speed broadband wireless systems
is increasing rapidly. In this context, the IEEE 802.16 standard
defines the wireless broadband access technology called WiMAX,
which introduces several interesting advantages including
variable and high data rate, last mile wireless access, point to
multipoint communication, large frequency range and QoS for
various types of applications. However, the actual version of the
standard does not define a MAC scheduling architecture in
uplink as well as downlink direction. Efficient scheduling design
is left for designers and developers and thus providing QoS for
IEEE 802.16 BWA system is a challenge for system developers.
The scheduling architecture must ensure good bandwidth
utilization, maintain the fairness between users and respond to
the constraints of some applications (i.e. video, voice).
In the literature, a good number of articles are available to
analyze the performance of the standard; however few studies
describing the scheduling algorithm are to be appreciated. To
analyze these studies, a classification based on the scheduling
mechanism or method used in the different propositions is
presented in this paper. Some studies are based on traditional
algorithms and other studies use new methods and mechanisms
that are proposed for the new standard in order to provide QoS. QoS for each class. IEEE 802.16 defines the following four
types of service flow with distinct QoS requirement:
- Unsolicited Grant Services (UGS): designed to
support Constant Bit Rate (CBR) services such as
voice applications.
- Real-Time Polling Services (rtPS): designed to
support real-time servic ...