QoS-aware BS switching and cell zooming design for OFDMA green cellular networks

In this paper, we investigate the QoS-aware BS switching and cell zooming (BS power control) problem for green wireless cellular networks. In particular, we develop a unified cross-layer model that captures interaction between the physical and network layers. By partitioning each cell into cell partitions we can explicitly model the inter-cell interference and location-dependent users´ QoSs. This enables us to design an efficient BS switching mechanism that can maintain user QoS requirements while exploiting heterogeneous traffic distribution over space and time for energy saving. In addition, we develop a power control algorithm that can further improve the energy efficiency. Specifically, we propose a power control strategy that adjusts the cell zooming level for the chosen network configuration by using non-cooperative game theory. We prove that the proposed power control algorithm converges to the Nash equilibrium of the corresponding power control game. Importantly, the proposed BS switching and cell zooming design can be implemented distributively. Finally, we demonstrate the efficacy and the significant energy saving gains of the proposed algorithms via numerical studies.