Institute of Electrical & Electronic Engineers
Femtocell base stations are required to set proper downlink transmit power under various building environment. Conventional power setting techniques use a fixed power offset over received power level of the strongest macrocell base station to expand indoor femtocell coverage along with mitigating the interference leakage to the outdoors. However, the power offset has not been adequately optimized for various interference conditions, leading to degradation of macrocell or femtocell throughput. The authors propose an auto-tuning scheme of the power offset adaptive to the various interference conditions such as size of buildings where femtocell mobile stations exist, and distance to a street where macrocell mobile stations exist.