关键词: 家庭基站, 功率控制, 路损, 反馈, 信干噪比

Abstract: The dense deployment and overlapping coverage of femtocells in LTE will result in strong interferences between them. For femtocell downlink interferences, this paper proposes a power control algorithm based on the path loss. The algorithm uses the subordinate users’ path losses and the non-subordinate users’ path losses as bases to set the initial transmitting power of each femtocell. Each user calculates its SINR, maps it to a Channel Quality Indication （CQI） and then sends it to the user’s femtocell to adjust the transmitting power. The algorithm fully considers two cases of self-transmitting power shortage and outside interference. The simulation results indicate that the algorithm gives a very good control of users’ SINRs, and improves the users’ throughputs at the same time.

Key words: femtocell, power control, path loss, feedback, Signal to Interference Plus Noise Ratio（SINR）