With the advent of more and more sophisticated applications for mobile users, high rate-demanding services and new habits of subscribers, wireless communications system designers are confronted to new challenges: providing ubiquitous availability, improving energy efficiency, enhancing system capacity and guaranteeing security. As some of these aspects cannot be simultaneously optimized in conv...

INTRODUCTION Since the first installation of cellular-based wireless public telephone systems back in the early 1980s, the number of wireless communication subscribers has seen dramatic and continuous growth across the world. The total global mobile subscribers grew from 11 million in 1990 to 472 million in 1999, according to ITU's (International Telecommunications Union) statistics. It is fore...

Starting with today's 3G :standards, future-generation wireless networks are discussed. Two complementing major trends are identified: seamless roaming between different air interfaces, leading to the Always Best Connected concept, and the continuous development of the current third-generation standards. The evolution of WCDMA toward high-speed downlink packet access, aiming for peak rates in t...

This thesis discusses potential country-specific effects that might explain mobile subscriber behavior in different countries. There are both techno-economic and psycho-socio-cultural factors explaining crosscountry differences. Based on the theoretical framework several hypotheses are presented with regards to possible usage-level observations. The theoretical framework is utilized with a rece...

This paper describes our concept, design and current implementation of the Secure Mobile Wallet. Mobile Wallet is an application stored in mobile phones providing to subscribers the possibility to perform various mobile financial transactions. In our approach Secure Mobile Wallet is stored and running in the Javacard SIM chip, called UICC module. The Wallet comprises several Javacard applets su...

Common information can be sent to multiple users with Broadcast/Multicast services. In smart home, multimedia services can be provided to users, who want to receive multimedia data through mobile phones. Most of multimedia applications are implemented using the streaming technique from contents provider to subscribers. It is important to manage the buffering amount remained in the user side in ...

Mobile phones are now an accepted part of everyday life, with users becoming more reliant on the services that they can provide. In the vast majority of systems, the only security to prevent unauthorised use of the handset is a four digit Personal Identification Number (PIN). This paper presents the findings of a survey into the opinions of subscribers regarding the need for security in mobile ...

With the rapid increase in wireless technologies and mobile devices in our daily lives, Internet of things has become very popular and is an emerging trend prevailing today. Since there are millions of devices sharing data in the Internet of Things and these devices can be stationary or mobile, therefore there are varying bandwidth connections. This varying bandwidth can have direct impact on p...