Energy‐efficient active offloading with collaboration communication and power allocations for heterogeneous ultradense networks

Abstract

AbstractFor the booming capacity requirements for the 5th generation mobile communication system (5G) to be supported, heterogeneous ultradense network (H‐UDN) is believed as a promising solution. The corresponding standardization and filed deployments of H‐UDN have been conducted. But the lower energy efficiency and severer interferences caused by densely deployed base stations (BSs) are still the 2 main obstacles for H‐UDNs. This paper addresses on above challenges and proposes active green offloading (AGO) strategy with collaboration communications to improve the system energy efficiency and decrease interferences. We propose the auction theory–based AGO for energy efficient objectives, which provides flexible user associations for H‐UDNs. Furthermore, aiming to guarantee the offloaded user performances and decrease interferences, we explore the collaboration communications with introducing the strongest interfering BS into the coordinated transmission BS set. This will change the interference signal into useful signal and then decreases interferences. Moreover, we introduce the supermodel game–based power allocation for further improvements of system energy efficiency after collaboration communications. Simulation results evaluate the 3‐stage improvements of system energy efficiency achieved by AGO, collaboration communications, and power allocation separately, which proves the benefits of AGO in H‐UDNs.