WLAN-UMTS integration in the UMTS-based approach can be performed either at the UMTS Core Network (CN) or Radio Access Network (UTRAN). Both interworking solutions provide the operator with additional license-free bandwidth and promise good handover performance. Integration at the radio access level has the advantage that the UMTS core network protocols remain unaffected and the interworking ar...

A distinguishing feature of the Universal Mobile Telecommunications System (UMTS) is the support of different levels of quality of service (QoS) as required by subscribers and their applications. To provide QoS, the UMTS backbone network needs an efficient QoS mechanism to provide the demanded level of services on UMTS network. We implement a model to investigate end-to-end quality of service (...

Much of interest has been involved in integrating UMTS and WLAN networks in order to take full advantage of the two. In such an integrated network, UMTS subscribers can access to UMTS services through 3G or WLAN access networks. This is highly desirable because network operators will use WLAN hotspots to increase network coverage, while offering subscribers with high-speed connections to 3G net...

Much of interest has been involved in integrating UMTS and WLAN networks in order to take full advantage of the two. In such an integrated network, UMTS subscribers can access to UMTS services through 3G or WLAN access networks. This is highly desirable because network operators will use WLAN hotspots to increase network coverage, while offering subscribers with high-speed connections to 3G net...

The capacity of Wideband Code Division Multiple Access (WCDMA) technologies in Universal Mobile Telecommunication System (UMTS) relies on efficient power control algorithms. The typical UMTS power control algorithm is based on fixed step size. Therefore, it causes oscillations when the radio channel is unchanged. Furthermore, it lacks abilities to cope with rapid variations in fast fading chann...

Universal Mobile Telecommunications System (UMTS) is the third generation (3G) mobile communications systems specified by European Telecommunications Standards Institute (ETSI) and the world-wide 3G Partnership Project (3GPP) within the framework defined by the International Telecommunication Union (ITU) and known as International Mobile Telecommunications-2000 (IMT-2000). ETSI and 3GPP are int...

This article analyzes the performance of vertical handover between UMTS and WiMAX networks by defining development architecture for supporting mobility between these two technologies. First, architectures and principles of operation of networks UMTS and WiMAX are detailed and compared. Then the main protocols of mobility are considered as support of handover between UMTS and WiMAX (802.16). Fin...

UMTS is expected to offer a powerful environment for location based multimedia services. We have specified such a service, using the packet switched domain of UMTS and overlaying standards like SIP and OSA/ Parlay. LoL@ (Local Location Assistant) is a showcase for future UMTS services and their requirements. It proposes an architecture for location based multimedia services, including advanced ...

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 paper presents the results of a set of experiments aiming to characterize the behaviour of the IP data service over a real UMTS network. According to our empirical measurements, packet losses are not frequent, meaning that UMTS link-level retransmission mechanisms are adequate to cope with data corruption through the wireless link. However, ARQ loss recovery mechanisms produce a high varia...