QoS As discussed in the previous section, service flows associate a set of QoS parameters
with each connection, which in turn are used to provide transport service to the
higher layer protocol. The discussion of some of these parameters in this section will
shed some light on the type of QoS that developers of the standard intended WiMAX
networks to deliver. The standard however does not mandate the implementation of a
specific QoS algorithm and leaves it up to vendors.
?– Traffic Priority Traffic Priority, with values ranging from 0 to 7 for low to
high priority, respectively, specifies the priority assigned to a specific service flow.
However, unlike many other networking protocols (e.g., Ethernet) where priority
alone defines the QoS parameters, priority in WiMAX is meaningful only when all
other QoS parameters are identical.
?– Maximum Sustained Traffic Rate This parameter, expressed in bits per second,
defines the peak data rate of the service flow. This defines the maximum data
rate that a service flow can achieve in absence of congestion. The parameter is
meaningful only when there is an excess bandwidth above the total needed to serve
the minimum needs of all flows.
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