Patent ID: 9622193
Date: 2017-04-11
CPC Classifications: H04W

Claim:
1. Method for reducing co-channel interference due to the deployment of N femtocells in a macrocellular network, N being an integer, said method comprising: taking power measurements on signals sent over this network, during which the power measurements are only taken by the N femtocells and these measurements are ordered temporally by a central facility of the system, performing optimization of transmission powers of the femtocells according to the taken power measurements, and performing allocation, to the femtocells, of their respective optimized transmission power, wherein, during the optimisation of the transmission powers of the femtocells, the transmission powers of the femtocells are maximised under the constraint of maintaining a minimum quality of service of terminals that would be attached, in the macrocellular network, to base stations of the macrocellular network, wherein, during the optimisation of the transmission powers of the femtocells, the following cost function is maximised: under the following constraint: where P t n is the emission power of a femtocell, referred to as FBSn, P t m is the emission power of a femtocell, referred to as FBSm, cu is a weighting coefficient associated with the transmission power of the femtocell FBSn, α n,m is a coefficient of attenuation due to a channel separating the femtocell FBSm from the femtocell FBSn, P r n,macro is a power received by the femtocell FBSn from a signal that was sent by a base station in the macrocellular network considered to be dominant by the femtocell FBSn, σ n 2 is a power of surrounding thermal noise perceived by the femtocell FBSn, ρ is a coefficient that represents the coverage of the femtocell FBSn beyond which a terminal that would be attached to one of the base stations of the macrocellular network would see a signal to interference-plus-noise ratio greater than a threshold value γ MUE target .