Joint CoMP and power allocation in ultra dense networks

摘要

Ultra dense networks (UDN) can be considered as one of the key technologies of 5G, since it can improve capacity and spectral efficiency. With the densification of cell networks, the signals received by cell edge users may be from more than one cell. In this situation, coordinated multi-points (CoMP) technology can be used to improve the sum rate in the system. Considering the constraints of resource allocation posed by CoMP, a CoMP based on cell load-aware (CLA-CoMP) is proposed. It can balance the cell load by adjusting the number of users serviced by small base stations. The relationship between small base stations and users being finalized. And then, the power allocation is considered. In order to improve the sum rate in the system, a power allocation based on proportional fairness (PF-PA) is proposed. It can allocate more power to better users with good channel state. The simulation results show that, CLA-CoMP can improve sum rate compared with traditional CoMP and PF-PA can improve sum rate compared with the average power allocation in the system. As a result, joint CLA-CoMP and PF-PA can obtain the maximum system performance gain.