Global System for Mobile Communications (GSM) supports full-rate and half-rate calls. In this paper, we propose analytical and simulation models to study the performance of four channel assignment schemes for GSM half-rate and full-rate traac. Our study indicates that among the four schemes, the repacking scheme has the best performance for mixing half-rate and full-rate traac. We also observe ...

This article emphasizes so-called Rayleigh fading, primarily in the UHF band, that affects mobile systems such as cellular and personal communication systems (PCS). The major elements that contribute to fading and their degradation effects in a communication channel are briefly summarized. Emphasis is then placed on methods for mitigating the degradation. Two examples of specific mitigation tec...

ommercial deployment of mobile multimedia services has been hindered by factors such as low data rate, high service costs, lack of or slow standardization , and the form factor of wireless hand-sets. The third-generation (3G) mobile technologies, generically known as International Mobile Telecommunications 2000 (IMT-2000), provide fast wireless Internet access and are anticipated to reduce the ...

A new efficient authentication protocol providing anonymous channels in the global system for mobile communications is presented, using algorithms A3, A5 and A8. The protocol is the result of a combination between the recent GSM authentication scheme proposed by Lee, Hwang and Yang (LHY) and the anonymous channel protocol presented by Lin and Jan (LJ). The result is a protocol with all the feat...

In this paper we present a method to realize geographic network traac simulation models. Our approach is based on a hierarchy of traac producing objects. It uses the polymor-phic concept of the object-oriented programming paradigm to realize a traac simulation model for traac sink, and sources with arbitrary properties. We used the method to develop a global traac model with hierarchical struct...