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The deployment of underlay small base stations (SBSs) is expected tosignificantly boost the spectrum efficiency and the coverage of next-generationcellular networks. However, the coexistence of SBSs underlaid to an existingmacro-cellular network faces important challenges, notably in terms of spectrumsharing and interference management. In this paper, we propose a novelgame-theoretic model that enables the SBSs to optimize their transmission ratesby making decisions on the resource occupation jointly in the frequency andspatial domains. This procedure, known as interference draining, is performedamong cooperative SBSs and allows to drastically reduce the interferenceexperienced by both macro- and small cell users. At the macrocell side, weconsider a modified water-filling policy for the power allocation that allowseach macrocell user (MUE) to focus the transmissions on the degrees of freedomover which the MUE experiences the best channel and interference conditions.This approach not only represents an effective way to decrease the receivedinterference at the MUEs but also grants the SBSs tier additional transmissionopportunities and allows for a more agile interference management. Simulationresults show that the proposed approach yields significant gains at bothmacrocell and small cell tiers, in terms of average achievable rate per user,reaching up to 37%, relative to the non-cooperative case, for a network with150 MUEs and 200 SBSs.

Improving Macrocell - Small Cell Coexistence through Adaptive Interference Draining