Novel QoS guaranteed cell selection schemes in LTE-A heterogeneous networks

In LTE-A, as a way to improve the system flexibility and efficient resources usage, is to introduce different services corresponding to different traffic streams to provide an adequate quality of service (QoS) for different types of user equipment (UE). In heterogeneous LTE-A networks with deployment of macro and small cells, cell selection is critical to provide QoS to UEs. However, most of the literature focused on the single traffic and did not consider QoS. In this paper, we propose two Signal to Interference plus Noise Ratio (SINR) based cell selection schemes named SINR with maximum data rate (SINR-MDR) and SINR with cell load threshold (SINR-CLT). SINR-MDR calculates the maximum data rate that UE can be assigned while SINR-CLT considers whether the QoS can be satisfied by the serving cell. We also take the demand of multiple applications with different QoS on UEs into account in the resource scheduling. The numerical results show that our proposed schemes attain an obvious improvement in the average UE throughput, and that the ratio of QoS satisfaction is more than the traditional one.