An Efficient Scheme for Access Selection over a Novel Green Heterogeneous Network Architecture

To cope with the too much energy consumption of base station (BS), this paper firstly gives a green heterogeneous network architecture, in which some BSs could be switched off or set as sleep mode when its local traffic is low, while the resident users rely on the mobile relay network composed by intelligent mobile nodes to connect to one of its neighboring BSs. Moreover, in order to achieve better performance, a mathematical model for relay selection is proposed by considering multiple factors, such as secrecy capacity (SC) for selected channels, remained energy¿iRE¿j for relays and location information. Accordingly, a novel dynamic relay selection approach based on Principal Component Analysis (PCA) is brought forward. Using this approach,the related factors which affect the quality of service (QoS) provisioning most could be found out by processing the observation data, and the their weights could be computed in a real-time way as well. The significant property of this approach is to reduce the useless energy loss by removing the redundant parameters. Finally, simulation results prove that the proposed approach outweights the existing ones in terms of system rewards, average throughput, and network lifetime.