However, both WiMAX PHY and MAC are
designed such that the network can be scaled significantly without compromising the
efficiency of the network. Due to the coordination performed by the BS, almost all the
transmissions are scheduled on a predefined basis. Only a small part of the bandwidth
is used for contention-based communications. Such efficient allocation of bandwidth
ensures that the efficiency with which the available bandwidth can be used is almost
independent of the number of SSs in the network.
WiMAX does not require the use of a specific RF band and can be used over a large
number of RF spectrums. This allows for scaling of the network beyond what can be
served by a single band of RF spectrum. In addition, it allows for techniques such as
adaptive antenna and beam-forming, allowing for efficient use of the RF spectrum and,
in turn, allowing for the network to be scaled.
In addition to the scalability of the network in terms of the number of subscribers
and total network capacity, WiMAX also enables deployment of services that are very
scalable. The bandwidth allocated to a service flow can scale from a few Kbps to the
entire bandwidth of the channel.
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