Modeling and analysis of Uplink-Downlink relationship in Heterogeneous Cellular Network

Small cell technology significantly improves the coverage and boosts the capacity in Heterogeneous Cellular Network. And Cell Range Expansion technology makes average rate nearly optimal in downlink. However, because of large transmit power disparities of different kinds of base stations, uplink and downlink need to be considered as two different networks. In uplink, the problem is that many user…