Practical design methods for ATM systems

Abstract

The basic service categories necessary for the information highway, namely, VLL (virtual leased line), VCS (virtual circuit switching), COPS (connection oriented packet switching), and CLPS (connectionless packet switching), have been proposed [9]. In this paper, we propose simplified practical design and control methods for the ATM systems to implement these categories of service. VLL may be realized by a cross-connecting technology of transmission systems. For VCS, the transmission speed is designed so as to satisfy the average call loss rate by applying a multidimensional traffic model. For COPS, using the call blocking probability as the call level QoS (quality of service), the maximum number of virtual channels (VCs) is designed to satisfy the QoS requirement. With the cell level QoS, the cell loss rate and mean cell delay, the transmission line speed and the buffer size are designed to satisfy the QoS requirement. In a system integrating COPS and CLPS, COPS is given nonpreemptive priority over CLPS, the latter being served on a best effort basis. In overload traffic conditions, a control method is proposed in which the number of assigned VCs is reduced so as to meet the cell level QoS requirement. © 2000 Scripta Technica, Electron Comm Jpn Pt 1, 83(10): 1–10, 2000