In this paper we introduce a new, flexible radio access stratum security architecture for 5G mobile networks that supports a dynamic, flexible radio access network with multiple different security termination points for the control and user plane communication between a mobile device and the network. We describe key refreshing methods that allow to refresh user plane keys for individual radio l...

In recent years several wireless communication standards have been developed and more are expected, each with different scope in terms of spatial coverage, radio access capabilities, and mobility support. Heterogeneous networks combine multiple of these radio interfaces both in network infrastructure and in user equipment which requires a new multi-radio framework, enabling mobility and handove...

Today’s digital TVs can provide advanced functionalities such as DVR, EPG, and PIP. They require simultaneous access to multiple channels using additional hardware resources, which increases the cost. In order to solve this problem, we propose to use wideband software defined radio (SDR) that can demodulate multiple channels on a single radio frontend. Through the SDR, we can obtain multiple ch...

The concept of cognitive radio has arisen as a generalization of the principle of multiple access in radio channels initially developed in the late sixties and early seventies including the pioneering methods of channel sharing depicted in the ALOHA and CSMA protocols. The intent is to go beyond the context of a single homogeneous system or network with a number of terminals that operate accord...

Abstract With the proliferation of wireless standards such as GSM/EGPRS, WLAN, WiMAX, WCDMA, HSDPA/HSUPA, and WiBRO — future wireless radio base stations will need to support multiple air-interfaces, frequency bands and modulation formats. Radio technology that enables reconfigurable hardware across multiple standards is a big challenge for base station developers. In this paper base station ar...

Vehicle-to-vehicle radio links suffer from multipath fading and interference from other vehicles. We discuss the impact of these effects on communication networks supporting an intelligent transportation system (ITS), in particular, automated vehicle control systems (AVCS’s). A statistical model for this channel is considered, and the performance of the network involving many links is evaluated...

We quantify the angular distribution of radio sources in the NVSS by measuring the two-point angular correlation function w(θ). By careful consideration of the resolution of radio galaxies into multiple components, we are able to determine both the galaxy angular clustering and the size distribution of giant radio galaxies. The slope of the correlation function for radio galaxies agrees with th...

In this paper, we carry out a simulation of a Radio over Fiber (RoF) link with VPI Transmission Maker, and Rohde&Schwarz (R&S) equipments. The VPI simulations perform optical path degradations for multiple radio modulation formats without using any specific radio numerical tools, while a Generator and a Vector Analyser are used for radio generation and reception.