Concurrent with the notion of connections, WiMAX uses the notion of service
flow, which identifies services. Every data transport service provided by the WiMAX
network is associated with a service flow. Each service flow is uniquely identified by a
32-bit SFID number and is associated with a connection through which it provides the
transport service. Associated with each service flow are three sets of QoS parameters
that define the QoS characteristic and the corresponding state of the service flow.
?– Provisioned QoS parameter set This parameter set defines the QoS parameters
of the service flow as provisioned to provide the service. The provisioned
parameters may be based on a SLA between a customer and a service provider.
However, it only defines what has been agreed upon for the service and does not
mean that such a service has been admitted or corresponding resources have been
reserved. For example, a network may be provisioned for a voice service, but the
resources are not reserved until the call has been set up. A service flow that has
this parameter defined but the other two QoS parameters set to null is called a
provisioned service flow.
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