The combination of Cloud Radio Access Network (C-RAN) and Heterogeneous Network (HetNet) networks has recently attracted a great deal of interest in academic and industrial fields. This architecture, called H-CRAN (Heterogeneous C-RAN) is therefore rightly considered as a promising solution for increasing the spectral efficiency and energy efficiency of 5G networks. As C-RAN network offers the advantage of energy reduction because BBU can manage many RRHs and the HetNets increases user’s throughput on account of the reduction between base stations and users. This article proposes a call admission control (CAC) algorithm focused on the radio remote heads (RRHs) in order to further reduce the power consumed by the H-CRAN by switching into sleep mode, the under-used RRHs. Simulations were performed into two contexts depending on the cell radius: in the context 1, the radius is 1 km and 0.5 km in the second context. These simulations focused on the power consumed as function of UEs number.

The simulations have shown that, more the cell radius is lower and more our algorithm reduces the power consumption with rates between 66.66% and 88.28% and the energy efficiency is multiplied by a ratio of 3.4.

5G, H-CRAN, RRH, CAC, HetNet, sleep mode, idle mode.