How to provide guarantees?
Some form of resource reservation within the network; hosts can’t “hide” delays
Challenge: do it asynchronously (i.e., as needed), don’t reserve peak rate for a voice connection/flow active 30% of the time
Want to support as many real-time flows as possible to increase revenue
Can the network admit a new flow at its requested QoS, without violating QoS of existing flows?
A flow has to specify its QoS (Rspec) and also its traffic pattern (Tspec)