Femtocell architecture involves the use of two separate layers-the macrocell and femtocell
layers. In this architecture, the former is the conventional cellular network, whereas the latter …

Heterogeneous networks using a mix of macrocells and small cells are foreseen as one of
the solutions to meet the ever increasing mobile traffic demand. Nevertheless, a massive …

The cognitive radio (CR) paradigm for designing next‐generation wireless communications
systems is becoming increasingly popular, and different aspects of it are being implemented …

In two-tier networks consisting of a macrocell overlaid with femtocells in cochannel
deployment and closed-access policy, spatial reuse is achieved at the price of severe …

In heterogeneous wireless networks with femtocells, the issue of interference between
femtocells and macrocells should be carefully considered. Using cognitive radio for …

To mitigate spectrum scarcity, the cognitive radio (CR) paradigm has been invoked for
improving the overall exploitation of the licensed spectrum by identifying and filling the free …

Cognitive radio (CR) techniques have been proposed for improving the spectral efficiency
by exploiting the temporarily unoccupied segments of the licensed spectrum, provided that …

We consider spectrum sharing in a cognitive radio network where a secondary system co-
exists with an automatic repeat-request (ARQ)-based primary system. A cooperate-and …

In this paper, we consider an underlay cognitive radio paradigm with a primary packet
system which implements automatic repeat request (ARQ)-based error control. We propose …

Femtocell base station (BS) is a low-power, low-price BS based on the cellular
communication technology. It is expected to become a cost-effective solution for improving …