A real-time integrated traffic management scheme in ATM networks: design and simulation

Abstract

This paper presents a RITM (real-time integrated traffic management) scheme that can effectively manage VBR (variable bit rate) and ABR (available bit rate) cell services having unpredictable characteristics in ATM (asynchronous transfer mode) networks. In addition to its exact traffic monitoring capability, the proposed scheme intends to efficiently use network resources without any deterioration in QoS (quality of service) of the accepted connections. Specifically, we highlight some functions of resource management, connection admission control that should be integrated to operated correctly in the emerging ATM networks. This enables ATM switch designers to find a suitable buffer design method. An unique feature of this scheme is that it has a special ATM cell control block, which makes it possible to manage ATM traffic in real-time so that the delay incurred to measure the cell arrival rate in existing algorithms is removed. By doing this, we can also save ATM switch buffers fairly, which means that those buffers would be used for more users or ABR services. This property makes the scheme extremely attractive for supporting most delay-sensitive and loss-sensitive applications at the same time without changing the existing ATM environments. The proposed RITM scheme has been verified to reliably monitor incoming traffic and to efficiently manage network resources by simulations.