The universal mobile telecommunications system (UMTS) has distinct benefits in that it supports a wide range of quality service (QoS) criteria users require order to fulfill their requirements. transmission video and audio real-time applications places high demand on the cellular network, therefore QoS is major problem these applications. ability provide UMTS backbone network necessitates an ac...

Identification, authentication and key agreement protocol of UMTS networks have some weaknesses to provide DoS-attack resistance, mutual freshness, and efficient bandwidth consumption. In this article we consider UMTS AKA and some other proposed schemes. Then we explain the known weaknesses in the previous frameworks suggested for UMTS AKA protocol. After that we propose a new UMTS AKA protocol...

colorimetric estimation of carotene in enteromorpha intestinalis, a se.awe~d of the family of ulvaceans abounding in the lake of rez?,yeh, has. proved ?' vlt~rrlln activity of this plant corresponding to 3000 internatlonal umts of vitamin a approximately.

Digital Object Identifier 10.1109/MMM.2009.933592 R adio frequency (RF) microelectromechanical systems (MEMS) switches and varactors, developed in 1996–2002 for lowloss switching/routing circuits and X-band (8–12 GHz) to millimeter-wave (mm-wave) (30–120 GHz) phase shifters, have seen increasing applications in tunable fi lters, tunable antennas, and reconfi gurable matching networks. RF MEMS d...

This paper gives an overview of the French collaborative project SAMU1, Advanced Services by Mastering UMTS, dedicated to develop enhanced services for users in a car. For that purpose, complementary research domains have been investigated such as radio resource management, IP over UMTS and the use of software agents. While field trials were planned in the project to validate the outputs of the...

3GPP (Third Generation Partnership Project) is defining UMTS releases which span the transition from GSM/UMTS coexistence to All-IP (i. e. end-to-end IP) UMTS network. The deployment of an UMTS network depends, in the first place, on the release an operator chooses to start service with. Other key decisions influencing UMTS deployment relate to the timing of the functional enhancements and capa...

The paper presents results of a co-existence measurement study between multiple ultra wideband (UWB) transmitters and a Universal Mobile Telecommunications System (UMTS) mobile phone. Two environments were explored: an anechoic chamber with one operating UMTS link and a true operational UMTS network. A large number of FCC compatible UWB transmitters were used to generate interference for an act...

UMTS is the most popular third-generation mobile phone system at present, and the UMTS AKA is his authentication and key agreement protocol. There are some weaknesses in the existed UMTS AKA protocol, such as synchronization question, storage overhead, insecurity with leakiness authentication vector, and weakness in mutual authentications. In this paper, we use the concept of proxy key to desig...

Identification, authentication and key agreement protocol of UMTS networks with security mode setup has some weaknesses in the case of mutual freshness of key agreement, DoS-attack resistance, and efficient bandwidth consumption. In this paper, we investigate UMTS AKA and some other proposed schemes. Then, we explore the known weaknesses of the previous frameworks suggested for the UMTS AKA pro...

Abstract – Universal Mobile Telecommunication System (UMTS) is a third-generation mobile communications system that supports high bit rate wireless multimedia applications. In addition to UMTS, HSDPA-based UMTS networks improve the initial UMTS networks in terms of radio resource allocation and data transfer performances. Due to the complexity of such system and difficulty of access to the real...