Uplink Power Control Based On Distributed Pareto Optimality In Femtocell Networks

Now more and more studies are concentrated on Femtocell which is mainly used as a solutionfor the weak indoor signal coverage in the wireless communication. Femtocell base stations(BSs)are low-power, miniature wireless access points that are typically set at a home and connected tobackhaul networks via digital subscriber lines(DSL). So Femtocell is a strong appeal to theequipment service providers and operators. Femtocells are directly integrated into the existingcellular network, thus it is inevitable to interfere with the macrocell users. In order to enableFemtocell to become a better solution, it has attracted many researchers.For the heterogeneous two-tier network, this paper is based on the Pareto-optimal theory tocontrol the uplink power of Femtocell and minimize its interference to macrocell users in theinterference management. Different from homogeneous network settings, while Femtocell andMacrocell are coexisting, it is first to protect the quality-of-service of all prioritized Macrocell UserEquipments (MUEs), actually which is the major obstacle that hinders the successful application ofthe femtocell solution. Focusing on the key interference issue, this paper adopts a load-spillageframework and introduces the concept of the utility function to guarantee the utilities of FemtocellMser Equipments (FUEs) and meet the minimum Signal-to-Interference-plus-Noise Ratios (SINRs)constraint of MUEs, and finally achieve the Pareto-optimality. That is to say, it is impossible toincrease the SINR of any one femto link without simultaneously reducing the SINR of some otherfemto link, and this is the Pareto-optimal point. In the power control of Femtocell User Equipments,we use the improved Femtocell User Equipment-SINR-Macrocell Base Station Protection algorithmto ensure that much more FUEs can normally communicate; in the meantime this paper willimprove the utility function, which can not only protect the MUEs’ performance but also increasethe system throughput from different aspects. Then by the matlab program, we can prove whetherthe theory is feasible or not.