Femtocells underlay in macro-cellular network is becoming more popular in order to use spatial frequency reuse gain, extend the coverage and capacity. But interference mitigation is the main challenge for the system designer. Instead of using centralized coordination among base stations to mitigate or reduce interference caused by femtocells to macrocells, this paper investigates the dynamic distributed interference management in femtocells underlay in a macrocell network. The distributed adaptive fractional frequency reuse (FFR) with power control is considered in the proposed approach. Simulation results show that the proposed interference management technique effectively reduces the downlink interference and increases the capacity and improves the outage probability of the macro-cellular network.
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