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*It is a network function that
computes the resource(bandwidth and buffers) requirements of new flow and
determines whether the resources along the path to be followed are available.
* Before sending packet the
source must obtain permission from admission control.
* Admission control decides
whether to accept the flow or not.
* Flow is accepted if the QoS of
new flow does not violate QoS of existing flows
* QoS can be expressed in terms
of maximum delay, loss probability, delay variance, or other performance
measures.
* QoS requirements:
o Peak, Average., Minimum Bit
rate
o Maximum burst size
o Delay, Loss requirement
* Network computes resources needed like “Effective”
bandwidth
* If flow accepted, network
allocates resources to ensure QoS delivered as long as
source conforms to contract
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