A new protocol for bandwidth regulation of real-time traffic classes in internetworks

Abstract

A novel bandwidth regulation mechanism is proposed which improves the ability of a packet-switching network to cope with multiple real-time and non-real-time tra c classes. The mechanism achieves regulation of link bandwidth at two levels. At the rst level, bandwidth is dynamically regulated b etween di erent tra c classes. The concept of`inter-class regulation' i s i ntroduced which enforces that the bandwidth left unused by a tra c class is divided among tra c classes with high bandwidth demands. At the second level, bandwidth regulation is enforced on end-to-end tra c streams, socalled ows, such that ows from the same class with identical routes have the same throughput constraints. This concept is referred to as`intra-class regulation'. A simple distributed p r otocol is presented that achieves intra-class and inter-class regulation in a general internetwork. The e ectiveness of the protocol is demonstrated by simulation experiments.

A Protocol For Relative Quality-of-Service In TCP/IP-Based Internetworks

“…There is one TReg daemon at each host and TReg daemons at di erent h o s t s communicate with each other to determine the maximum rate of each source. In a previous study 6] it was shown that these mechanisms are su cient t o e ectively support relative QoS in a general packetswitched network.…”

“…Theoretical concepts for relative QoS have been studied before 1, 5 , 6 , 7 ] . F or example, in the schemes investigated in 5,6], all ows whose throughput is limited by the same network resource have identical throughput constraints. Obviously, the performance guarantees with relative QoS are weaker than those obtainable with absolute QoS.…”