Nowadays, when people colloquially use the word “wireless,” they almost always mean a portable telephone. Over the last 10 years, there has been tremendous growth in the mobile communications markets not only in Japan but also worldwide. For these 10 years, the most popular service has been dominated by voice communication. However, modern mobile communications systems are shifting their focus ...

The Internet Paradox refers to findings that demonstrated that the increase in communications brought about by Internet usage actually had negative effects on user’s psychological well-being and social involvement. This study proposes that face-to-face contact promotes the development of rapport and thereby individuals that use the internet excessively will lack these necessary social skills. S...

FUTURE TRENDS OF MOBILE AND PERSONAL COMMUNICATIONS (Invited Paper) Theodore S. Rappaport Mobile & Portable Radio Research Group Bradley Department of Electrical Engineering Virginia Tech Blacksburg, VA 24061-0350 email: [email protected] This tutorial paper provides an overview of the fundamental concepts used in cellular radio communications, and illustrates the likely evolution and growth of t...

Because of limited resources, African telecommunications systems limited to a small percent of the continent's population. Telephone proliferation in Africa is only .4/100 population compared to 4.5 in South America and 5.2 in Asia. In order to combat this deficiency, organizations such as the International Telecommunication Union and the Economic Commission for Africa have joined in an effor...

Text telephone devices are text-based terminals that allow the users to communicate by text via fixed-line telephone networks. Since cellular phone systems are sometime subject to severe radio channel impairments and the modem signals of these text telephones are therefore not always transmitted reliably, the Federal Communications Commission (FCC) has required a solution to guarantee a reliabl...

As we see a growing variety of network and application behaviors, it becomes more important that protocols adapt to their surroundings. Building adaptive protocols is complicated, and therefore we have considered building hybrid protocols that switch between specialized protocols. In this paper, we show for which communication properties this is a correct solution, and classify these using a ne...

Multi-user multimedia editing ought to be supported by different means. Besides technical means required for editing a given document by several users simultaneously, there is also a demand for communication mechanisms which are able to support the synchronization of the users. The system presented in this paper does not only offer multi-user multimedia editing capabilities but also provides a ...

With cellular phones mass-market consumer items, the next frontier is mobile multimedia communications. This situation raises the question of how to do power control for information sources other than voice. To explore this issue, we use the concepts and mathematics of microeconomics and game theory. In this context, the Quality of Service of a telephone call is referred to as the "utility" and...

To allow for wireless communications among a specific geographic area, base stations of communication network must be deployed to allow sufficient radio coverage to every mobile users. The base stations, successively, must be linked to a central hub called the MSC (mobile switching centre). The mobile switching centre allow connectivity among the PSTN (public switched telephone network) and the...