Energy Efficient Deployment of Heterogeneous Networks

A novel energy efficient heterogeneous networks (HetNet) deployment scheme is proposed in this paper. Unlike the traditional deployment, we consider the scenario with picocell eNodeB (PeNB) at the edge instead of under the umbrella of macrocells in HetNet. In the novel scheme, one PeNB with directional antennas is deployed on the border of neighbor macrocells which is equivalent to a combiner of PeNBs to associate MeNBs around. Compared with the traditional scheme, we have proved that the novel scheme performs better in fairness and efficiency, in terms of coverage area (proportional to offload rate), spectrum and energy efficiency for both edge users and overall users. Meanwhile, the technologies that try to reduce the difference and imbalance of the transmit power in HetNet obtain more inherent gains in the novel scheme, such as cell range expanded (CRE). Our results show that, the scheme proposed is also a spectrum and energy efficient heterogeneous deployment scheme that the energy efficiency is increased from 20% up to nearly 60%.