The traffic performance of third generation mobile systems is greatly influenced by the multiple access protocols used in the radio access subsystem. The paper introduces an access protocol, SIR (Service Integration Radio Access), which has the potential for accommodating the requirements of speech and bursty data traffic in an efficient way. SIR is evolved from a protocol (PRMA++) studied in t...

The Universal Mobile Telecommunication Standard (UMTS) is the Third Generation (3G) mobile technology with the widest public acceptance. Although, enhanced in matters of security, comparing to its predecessor i.e., the GSM, it still has vulnerabilities that can lead to security breach. In this paper we investigate the vulnerabilities of the UMTS architecture that can be exploited by a malicious...

*1 IMT-Advanced: A standard positioned as the successor to IMT-2000 at International Telecommunication Union Radiocommunication sector (ITU-R). It calls for data rates of about 100 Mbit/s for high mobility and 1 Gbit/s for low mobility. *2 ad hoc network: A network in which several mobile terminals communicate without any dedicated infrastructures such as base stations or access points. *3 UWB:...

Mobile TV is a new interesting area in the telecommunication industry. The technology for sending live video to mobile clients is characterized by relatively low CPU processing power, low network resources and low display resolution. In this paper we discuss a solution to all of these problems by using application layer multicasting. This can significantly reduce the needed bitrate and required...

Next generations of mobile telecommunication have to provide not only the voice or message services but also a wide set of new applications coming from the Internet world. Because of fading wireless channel and limited bandwidth, the problem of resource and power allocation has become of prime importance for stability and effectiveness of future mobile communication systems. In this paper we st...

This paper presents and discusses the major trends in two important areas: distributed mobile computing and personal telecommunications. The evolution in these two areas indicates a major paradigm shift towards a merging of computer and telecommunications technologies into a world of mobile, interactive computing and communications. The resulting applications comprise the handling, exchange, re...

Background: The increasing use of telecommunication devices such as Wi-Fi modems and mobile phones in the recent years can change the cellular structure of microorganisms so the generation of electromagnetic waves has led to concern in the community whenever be exposed to these fields and may have harmful effects on human health.Material and Methods: Standard strains of bacteria were prepared o...

In the recent years the mobile telecommunication networks have gone through on a big development. The services of the systems have been extended very quickly, such as the number of the subscribers. The various multimedia and Internet systems have become quickly the part of our life. This phenomenon takes effect on mobile communication, too. The third-generation mobile networks could be the solu...

Recently, the issue of monitoring and repairing leakage from cable television networks have re-emerged, particularly after International Telecommunication Union released a part ultra-high frequency spectrum to mobile broadband services. The newly allocated spectrum, known as digital dividend bands, was traditionally used throughout Europe for TV broadcasting. emerging problem is mutual interfer...