Next generation wireless networks are expected to be greatly supported by unmanned aerial vehicles, which can act as aerial base stations and constitute a promising solution for the exorbitant rise in user demands. This is possible because of unmanned aerial vehicle characteristics such as mobility, flexibility, increased line-of-sight probability, and their ability to access unreachable locations. Extensive research is now widely performed on the deployment, performance analysis, resource management, trajectory optimization, and channel modeling in such networks. This survey article focuses on the different applications and the related algorithms for realizing aerial base stations by thoroughly reviewing each related research area. In a nutshell, this article provides key applications, challenges, and the technology used for the design and analysis of unmanned aerial vehicles as base stations.

No abstract

Efficiency' is a booming word in the current global scenario. The paper describes such an algorithm named 'cell zooming' that aims at providing energy efficiency to the operating cellular network. Energy efficiency is achieved by operating some selected base stations in sleep mode. The energy consumed in sleep mode is much lesser when compared to the normal operation. Here, the performance analysis for cell zooming is done by comparing a number of channel models; taking into account the practical implications. Cell zooming algorithm helps in attaining a greener environment; besides satisfying all the user needs with appreciable quality of service.

No abstract