In wireless heterogeneous networks (HetNets), the spatial densification through small cells
and the application of massive MIMO antenna arrays are key enablers for high data …

The telecommunication sector plays a significant role in shaping the global economy and
the way people share information and knowledge. At present, the telecommunication sector …

Due to the flying nature of unmanned aerial vehicles (UAVs), it is very attractive to deploy
UAVs as aerial base stations and construct airborne networks to provide service for on …

The combination of user-centric network densification and distributed massive multiple-input
multiple-output (MIMO) operation has recently brought along a new paradigm in the wireless …

Mobile communications are growing and the number of users is constantly increasing at an
accelerated rate, as well as the demand for the services they request. In the last few years …

In smart cities, cellular network plays a crucial role to support wireless access for numerous
devices anywhere and anytime. The future 5G network aims to build the infrastructure from …

In this paper, we consider a cellular system, in which base stations (BSs) are powered by
both on-grid and renewable energy sources. To efficiently utilize the harvested energy of the …

A green cognitive radio network (CRN), characterized by base stations (BSs) that conserve
energy during sleep periods, is a promising candidate for realizing more efficient spectrum …

An enormously increasing number of mobile communications devices and IoT sensors have
driven rapid advance in wireless and cellular network technologies. Owing to limited energy …

Internet of Things (IoT) devices often have batteries of limited capacity, which are not easily
replaced or recharged. This implies very short device lifetimes, and calls for a very careful …