?– Flexible use of RF bandwidth All the PHY protocol standards developed by
IEEE 802.16 are not locked to a specific frequency and bandwidth. This allows
for use of the technology in whatever spectrum a usable bandwidth is available.
It may be used by certain operators using licensed spectrum and others using
license-free spectrum. This also allows for flexible deployment in various regulatory
regions of the world, as the allocation of spectrum in different regulatory
regions is different.
?– Efficient use of spectrum WiMAX MAC was designed to be highly centralized
with the BS controlling all the accesses to the medium as well as dictating how efficiently
the spectrum is used. The use of RF spectrum is controlled at all times by
the BS such that a large majority of the channel utilization is scheduled by the BS
based on the need of various SSs and their services. This allows for an extremely
efficient use of RF spectrum as virtually no channel capacity is wasted. It is not
only the scheduling part but also the adaptive coding technique that makes it very
efficient in terms of use of the spectrum. In addition, the notion of various stages
of service flow, which allows a WiMAX system to reserve a resource for a service
flow but allocate the resource to other services if the owner of the resource has no
immediate use for it, allows efficient use of the spectrum.
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