Management of 3.5-GHz Spectrum in 5G Dense Networks: A Hierarchical Radio Resource Management Scheme

A hierarchical radio resource management scheme using small and macrocells would allow cellular users to reuse and exploit potentially underutilized spectrum portions. To overcome the issue of limited resources that can be allocated to users, one can exploit the spectrum access system (SAS), a technology that enables better allocation of the available spectrum to users in bands below 6 GHz. However, exploiting SAS also introduces certain challenges.