Millimeter wave (mmWave) links will offer high capacity but are poor atpenetrating into or diffracting around solid objects. Thus, we consider ahybrid cellular network with traditional sub 6 GHz macrocells coexisting withdenser mmWave small cells, where a mobile user can connect to eitheropportunistically. We develop a general analytical model to characterize andderive the uplink and downlink cell association in view of the SINR and ratecoverage probabilities in such a mixed deployment. We offer extensivevalidation of these analytical results (which rely on several simplifyingassumptions) with simulation results. Using the analytical results, differentdecoupled uplink and downlink cell association strategies are investigated andtheir superiority is shown compared to the traditional coupled approach.Finally, small cell biasing in mmWave is studied, and we show thatunprecedented biasing values are desirable due to the wide bandwidth.
展开▼
