Unsynchronized Small Cells with a Dynamic TDD System in a Two-Tier HetNet
In this paper, a closed-form expression of the outage probability in a downlink two-tier heterogeneous network (HetNet) is derived. The second tier uses dedicated spectrum and adopts an unsynchronized time division duplex (TDD) system with a dynamic frame configuration. The marked point process is used to model both locations of transmitters (users equipment/small cell base station), in addition to the time that has passed through each small cell sub-frame at any time of a small cell sub-frame of interest. The system performance is evaluated under different traffic dominators (uplink and downlink) by taking into account the impact of the structure of the frame- configurations. Furthermore, the system parameters, such as small cell density and the uplink control factor, are also evaluated.