This paper presents an integrated traffic engineering (TE) system for new generation multilayer networks based on the generalized multiprotocol label switching (GMPLS) paradigm, and reports the performance analysis of such a system. The proposed TE system aims at dynamically reacting to traffic changes and, at the same time, fulfilling quality of service (QoS) requirements for different classes of service. The proposed solution consists of a hybrid routing approach and a bandwidth management strategy. The former makes use of both off-line and on-line methods to accommodate traffic requests. The latter, based on an "elastic" use of the bandwidth, allows the handling of different priorities among data flows, possible preemptions, and rerouting. The proposed TE permits the accommodation of the largest amount of traffic, while guaranteeing good performance to mission-critical services. The main building blocks and the operations of the system are reported and the major advantages are discussed. The performance of the proposed system are compared with the ones relating to a reasonable alternative system based on overprovisioning, to highlight its advantages of in terms of traffic volume that can be accommodated for a given network infrastructure.

TIM (Telecom Italia Mobile) and CSELT (the research centre of the Telecom Italia group), in co-operation with Ericsson, are performing an experimental evaluation of UMTS (Universal Mobile Telecommunications System), a proposal for the IMT-2000 family of third generation mobile radio systems. In particular, the trial has been focused on the FDD (frequency division duplexing) component of UMTS, based on a wideband direct sequence CDMA access technique. The aim of the trial is to study the characteristics of the system, as far as the radio and network aspects are concerned, with reference to some UMTS services.