Cell edge effect has been recently paid much attention in the development of new mobile communication systems because it can cause serious performance degradation in the cell edge. The cell edge problem is essentially due to non-uniform distribution of the radio power of cellular systems. It can be softened to a certain extent by using new radio architecture called distributed antenna system (D...

Covid-19 was detected in Iran since February 2020, and until September 2020, all the provinces of the country were affected by this disease (1). During the Covid-19 pandemic, many older adults received a lot of stress and anxiety from the media and society, which caused them to become socially isolated and depressed. On the other hand, creating quarantine and social distancing as a policy adopt...

Partially, the future of mobile and cellular networks will be about energy consumption savings, at the network infrastructure side. In the heterogeneous cellular networks environment, these can be achieved based on bandwidth adaptation, discontinuous transmission, relays, or even Base Stations (BSs) shutdown when possible. This paper proposes an approach for power savings using Vertical Handove...

In this paper a new approximate method for the computation of outage probabilities in a mobile radio environment is proposed. It allows one to evaluate the performance of a mobile radio system in the presence of fading, in a very fast and accurate way, while maintaining a very good flexibility as to the application to different network environments. Coding is also considered as a possible choic...

Papers on the Next Step of UNIVERGE : Toward the Future RADIOSCAPE — A Radio Propagation Analyzing Service for Effective Coverage Area Design — By Takashi ONO,* Yoshinori WATANABE,* Hiroto SUGAHARA,* Kazuhiro OKANOUE* and Shuntaro YAMAZAKI* *Internet Systems Research Laboratories The basic concept of the radio propagation simulator “RADIOSCAPE” is reported. The simulator is helpful for wireless...

In this paper, the impact of mobility of both primary and secondary users on the performance of cognitive radio mobile cellular networks with real-time traffic is investigated. To this end, an algebraic set of mathematical expressions for the handed-off arrival rate, and new call blocking, forced termination, and interruption probabilities of secondary users are derived under the assumption tha...

The evolution of cellular networks from one generation to another has led to the deployment of multiple radio access technologies (such as 2G/2.5G/3G/4G) in the same geographical area. This scenario is termed heterogeneous cellular networks. In heterogeneous cellular networks, radio resources can be jointly or independently managed. When radio resources are jointly managed, joint call admission...

GTE Laboratories, in cooperation with GTE Mobilnet, has developed and deployed PERFFEX (PERFormance Expert), an intelligent system for performance and configuration management of cellular networks. PERFEX assists cellular network performance and radio engineers in the analysis of large volumes of cellular network performance and configuration data. It helps them locate and determine the probabl...

This article investigates and evaluates a handover exchange scheme between two secondary users (SUs) moving in different directions across the region of neighboring cell cognitive radio network. More specifically, this investigation compares performance SUs cellular network with without channel scheme. The shows reduced failure, blocking, forced access probabilities respectively, for buffer as ...

This paper introduces a base station antenna system as a future cellular technology. The base station antenna system is the key to achieving high-speed data transmission. It is particularly important to improve the frequency reuse factor as one of the roles of a base station. Furthermore, in order to solve the interference problem due to the same frequency being used by the macro cell and the s...