Femto-hücre ağlarında en düşük inen bağlantı girişimi için ortak frekans tahsisi ve güç kontrolü

Due to the fact that the most of data services and more than half of calls are requested indoors, it has been dramatically important and even a must for cellular operators to provide more than adequate indoor coverage. Instead of expensive traditional approach which is to use outdoor macrocell base stations to provide good indoor coverage, indoor systems for the cases of small offices and homes are found more convenient and efficient.Femtocell is one of the developing technologies as a recent solution to aforementioned problems. They offer to improve the indoor coverage and reduce the cellular network load. However, in case of the most feasable solution, co-channel deployment of the femtocell network over the existing macrocell network, a closed access approach could result in serious co-channel interference problems.In this thesis, improvements to the performances of both femtocell and indoor macrocellular users in terms of average achieved data rates are considered. A joint spectrum and power control algorithm is proposed to mitigate the co-tier and cross-tier interferences. The algorithm aims to save the indoor macrocell subscribers from the violation of femtocells whilst providing throughput to femtocell subscribers as higher as possible. Simulations including physical layer and system level are conducted to determine the performance of the proposed method. Results reveal that an algorithm that combines the management of two important resources, spectrum and power, performs really well in two-tier networks, even better than the techniques managing only one resource, in terms of overall system performance.