Centralized Cell Cluster Interference Mitigation for Dynamic TDD DL/UL Configuration with Traffic Adaptation for HTN Networks

The dynamic TDD DL/UL configuration based on instantaneous asymmetric DL/UL traffics is an effective way to increase the radio resource utilization. However, free reconfiguration of each cell´s TDD DL/UL configuration may result in significant co-channel co-subframe DL-UL interference. In this paper, we propose and evaluate a novel centralized cell clustering interference mitigation scheme for dynamic TDD DL/UL configuration with traffic adaptation in HTN networks where multiple outdoor pico cells and multiple macro cells deploy on the same carrier frequency. Cells that suffer from serious eNB-to-eNB and UE-to-UE interference are dynamically grouped into different clusters in a centralized manner. In order to increase the DL/UL resource utilization with traffic adaptation for clusters, an optimal TDD DL/UL reconfiguration scheme is proposed based on the metric of maximizing the predicted total cluster DL and UL throughput deduced by the variations of buffer status and statistic resource utilization. Finally, the system level simulation results are provided for the evaluation of our proposed algorithms with non-full buffer traffic under different traffic load level.