In this paper, we propose an improved and efficient AKA protocol named “NS-AKA” to prevent the 3G UMTS networks from various attacks like man-in-the-middle attack, redirection attack, replay attack and active attacks in the corrupted UMTS networks. This protocol completely eliminates the need of synchronization between a mobile station and its home network, and protects the actual identity of e...

In most European countries, UMTS networks have been set up and completely cover urban areas. At the beginning of UMTS, there were only a few users but with a special pricing policy, the number of users is increasing drastically. A few providers already offer flat rates for UMTS and their networks get more and more crowded. Therefore, an efficient radio resource management (RRM) is one of the ke...

Potential short-term effects of intermittent UMTS electromagnetic fields (UMTS-EMF) on the cerebral blood circulation were assessed by near-infrared imaging. Different UMTS-EMF signals and exposure positions were applied in an exploratory study on eight subjects. Since no significant changes were found, the UMTS-EMF signal and the exposure position with the maximum changes in the measurement va...

An important property of high altitude platform station (HAPS) Universal Mobile Telecommunications Systems (UMTS) is that unlike terrestrial tower based systems. interference is dependent on the antenna characteristics of HAPS rather than the terrain features (i.e., shadowing) in the service area. In this paper. we exploit this unique HAPS property to propose simple and effective adaptive softe...

The UMTS specification (Release 5), a third-generation mobile system, proposes an all-IP network architecture. In the near future, UMTS will offer a variety of services to users. Some of these services, e.g. real-time services, require a certain guaranteed quality of service. Multi Protocol Label Switching (MPLS) is a technology providing means to control data flows in IP networks. MPLS has bee...

In UMTS system level simulations DCH (Dedicated Channel) error models are used to represent the characteristics of lower layers in order to save simulation time. Usually DCH BLER (Block Error Ratio) statistics are taken from link level simulations or only certain fixed values for DCH BLER are used for system level simulations. In this paper we present measurements of UMTS DL(Down Link) DCH erro...

Third generation mobile systems supporting UMTS radio access, will offer a wide range of telecommunication services including voice, video and data. In line with the ETSI GMM report, these services will be provided in both public and private environments via multiple access networks such as ATM, DECT, GSM and UMTS. The evolution path from second generation systems towards UMTS is investigated w...

In UMTS system level simulations DCH BLER models are used to represent the characteristics of lower layers in order to save simulation time. Usually DCH BLER statistics are taken from link level simulations or only certain fixed values for DCH BLER are used for system level simulations. In this paper we present measurements of UMTS DL DCH BLER for 360kbit/s UDP data traffic (372kbit/s incl. UDP...

The thesis work is about the investigation of different handovers in the 3G UMTS network which is the vital issue to the network to maintain the user's connection during in the ongoing session with the user's movement. The investigation is based on the UMTS QoS traffic classes. For this purpose the soft and the hard handovers techniques are analyzed in different scenarios implemented in the OPN...

Building new UMTS (Universal Mobile Telecommunication Systems) based networks seems to be on time. Nowadays the UMTS network design related problems are moving to the interconnection of Radio Network Controllers (RNC), placement of Media Gateways (MGw) and planning of the core network topology. This new area of UMTS network design is studied in the paper. A new algorithm is proposed for the abo...