Joint spectrum and power efficiencies optimization for statistical QoS provisionings in wireless networks

Spectrum and power efficiencies are both crucial to design efficient wireless networks. In past two decades, spectrum and power efficiencies of wireless networks are optimized separately. However, to increase the spectrum efficiency and reduce the energy consumption, it is necessary to jointly optimize spectrum and power efficiencies of wireless networks. In this paper, we propose an efficient framework to model the statistical delay quality of service (QoS) guarantees, in terms of QoS exponent, effective spectrum efficiency (ESE), and effective power efficiency (EPE), for joint spectrum and power efficiencies optimization to transmit real-time traffics over wireless networks. In particular, we derive the relationship between ESE and EPE under statistical QoS provisioning constraint. Based on the relationship, we obtain the mutually beneficial region and contention-based region. We also analyze the global maximum EPE and optimal average transmit power under various statistical QoS guarantees. Then, we develop a novel strategy to achieve the joint spectrum and power efficiencies optimization. Also conducted is a set of numerical evaluations showing that our proposed strategy can achieve superior joint spectrum and power efficiencies optimization for various statistical QoS provisionings.