A dynamic distributed power control scheme in heterogeneous networks

Pico eNodeBs (PeNB) are deployed in 3GPP LTE-A networks to improve the overall performance. However, the inter cell interference may become severe without suitable coordination. In this paper, a dynamic distributed power control scheme is proposed. First, each PeNB gathers information about pico user equipments (PUE) in this cell and macro user equipments (MUE) this PeNB is interfering. Then, in power adjusted subframes, the transmit power of some resource blocks is increased while that of the others is reduced by each PeNB after throughput estimation. This process can guarantee the throughput of the PUEs and reduce the interference to MUEs in the vicinity at the same time. Simulation results show that the scheme will improve the experience of the cell edge UEs. At last, guidance is provided on how to optimally configure the parameters to achieve the potential of the scheme.