We present a protocol developed by the ASPeCT project for secure billing that provides the incontestable charging that is required for UMTS. This protocol realises a payment system for value added services. We describe the protocol and in particular the design features that are of particular relevance to the UMTS environment. We also describe the configuration of a field trial of this protocol ...

The objective of this work is to evaluate the Quality of Service (QoS) of a Universal Mobile Telecommunication System (UMTS) cell. Among UMTS characteristics, we focus the attention on two aspects strictly related with the identified QoS measures: the random-access procedure and the admission control strategy. Using a model-based approach, we model and evaluate a UMTS cell under several service...

This document specifies an Extensible Authentication Protocol (EAP) mechanism for authentication and session key distribution using the Universal Mobile Telecommunications System (UMTS) Authentication and Key Agreement (AKA) mechanism. UMTS AKA is based on symmetric keys, and runs typically in a UMTS Subscriber Identity Module, a smart card like device. EAP-AKA includes optional identity privac...

The DiffServ framework has been proposed as a candidate for the provision of QoS support in the UMTS Core Network, not only in the literature but also in the 3GPP specifications. This paper proposes specific traffic conditioning, scheduling and buffer management algorithms for the UMTS Core Network, based on the concepts of the DiffServ framework. Simulations show that the proposed mechanisms c...

UMTS services integrate mobile communications and the Internet, based on a powerful and standardized service architecture. To achieve a positive user experience, careful resource planning, service and protocol design are necessary. After dealing with some fundamental issues of UMTS services, this paper presents LoL@, the Local Location Assistant. It is a prototype of a location based UMTS servi...

There is widespread public concern about the potential adverse health effects of mobile phones in general and their associated base stations in particular. This study was designed to investigate the acute effects of radio frequency (RF) electromagnetic fields (EMF) emitted by the Universal Mobile Telecommunication System (UMTS) mobile phone base stations on human cognitive function and symptoms...

This study adopted a simulation based network performance analysis to investigate the effects of the application of different voice encoder schemes on QoS of VoIP system ,deployed with UMTS network Through different network simulation experiments using realistic network scenarios in OPNET environment, the results indicated that the choice of suitable voice encoder scheme with a small number of ...

Mobile telecommunication systems such as General Packet Radio Service (GPRS) and Universal Mobile Telecommunications System (UMTS) provide packetswitched service for mobile terminals. 3GPP Release 4 and Release 5 further offer packet voice over a GPRS/UMTS infrastructure so that IP based communications between mobile to mobile is expected to be one of the major traffic types in the future 3G Al...