An user selection algorithm for the heterogeneous network

The cross-tier inter-cell interference between macrocell and microcell is the bottleneck against performance improvement of the heterogeneous network. To overcome this bottleneck, we propose a user selection algorithm that takes effect of chordal distance-channel norm balance on the system into account and predetermines the available user set. Simulation results demonstrated that the proposed algorithm could achieve user diversity gain while lowering cross-tier interference.