Throughput Optimization, Spectrum Allocation, and Access Control in Two-Tier Femtocell Networks
The deployment of femtocells in a macrocell network is an economical and effective way to increase network capacity and coverage. Nevertheless, such deployment is challenging due to the presence of inter-tier and intra-tier interference, and the ad hoc operation of femtocells. Motivated by the flexible sub-channel allocation capability of OFDMA, the authors investigate the effect of spectrum allocation in two-tier networks, where the macrocells employ closed access policy and the femtocells can operate in either open or closed access. By introducing a tractable model, they derive the success probability for each tier under different spectrum allocation and femtocell access policies.