Reserved bandwidth and reservationless traffic in rate allocating servers

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Abstract
Bandwidth efficiency in communication networks can require supporting traffic with greatly differing quality of service requirements, particularly in terms of delay. The facilities needed to permit users to take advantage of excess bandwidth include (i) a method of conveying network state information to the source, and (ii) a method for guaranteeing quality of service requirements. Reservation oriented rate allocating servers (RASs) provide QOS guarantees while reservationless RASs provide fairness. This paper gives a technique for modifying a reservation oriented RAS to accommodate reservationless traffic and allow users with bandwidth reservations to take advantage of excess network bandwidth. In addition, this paper shows how to use the packet pair bandwidth probing technique with these new RASs to provide effective and efficient congestion control.

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