<I style="mso-bidi-font-style: normal">A performance study of downlink allocation schemes for cognitive cellular - femtocell mobile networks<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></I>

Abstract

In mobile communications networks, two thirds of the total calls and 90% of the data services are carried out indoors [1]. However, with high coverage density in cities and low signal levels at cell edges and increase of signal quality of indoor coverage and cell edge exist the major challenge of all the mobile network operators. The research and deployment of femtocell networks have recently brought a great opportunity for mobile network operators to improve the signal quality of indoor coverage at low cost. Cognitive radio for mobile communications also has been proposed for future mobile communication. The integration of femtocell and cognitive radio is considered to be an efficient solution for improving better coverage and higher data transmission. In the paper, we investigate the downlink channel allocation scheme of cognitive cellular-femtocell mobile networks proposed for beyond fourth generation (4G) mobile communications. The performance evaluation of the channel allocation schemes is carried out by computer simulation in order to identify the most efficient downlink channel allocation scheme.<?xml:namespace prefix = \"o\" ns = \"urn:schemas-microsoft-com:office:office\" />