For example, if a
service flow is transmitting less than its minimum reserved traffic rate, its excess
reserve bandwidth may be reallocated to serve other flows. Second, the sum total
of the minimum reserved traffic rate of all service flows over a channel can be more
than the overall available bandwidth of the channel provided that the statistical
multiplexing of service utilization would guarantee that the minimum traffic rate
is satisfied over time for all services. This allows for over subscription and efficient
use of resources.
?– Minimum Tolerable Traffic Rate As the name implies, this specifies the
minimum traffic rate below which the user (customer or application) would not
tolerate the service. For example, for VoIP or IPTV applications, traffic rates
below a certain threshold may not be useful. A WiMAX network can make use
of the knowledge of such minimum tolerable thresholds in two ways. When resources
are busy and the network cannot deliver the minimum reserved traffic
rate, it can make sure that the service is maintained by delivering at least
the minimum tolerable traffic rate. However, when it cannot even maintain the
minimum tolerable traffic rate, it can make better use of the bandwidth by not
attempting to deliver the less than the minimum tolerable rate traffic and allocating
the bandwidth to another flow.
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