Abstract
Higher-order modulation such as 256-QAM is a key technology to increase data rates within a limited bandwidth. This paper proposes a channel quality indicator (CQI) table switching control method corresponding to 256-QAM that improves the 5-percentile user throughput in Heterogeneous networks (HetNets), in which user equipments (UEs) connected to pico cell can use different CQI table depending on where UE is located within the original pico cell or the related CRE region. The features of the proposed CQI table switching control method are described in comparison with the conventional method. Computer simulation results such as average, 5-percentile and 95-percentile user throughput are provided as parameters of cell selection offset for two types of HetNets, i.e., co-channel deployment with time-domain enhanced inter-cell interference coordination (eICIC), and different frequency deployment between macro and pico cells. We confirmed that the proposed method can improve 5-percentile user throughput while maintain or improve the average and the 95-percentile user throughput for the co-channel HetNet with eICIC.