Po-Han HuangHsu KaoWanjiun LiaoWANJIUN LIAO2019-10-312019-10-312017https://scholars.lib.ntu.edu.tw/handle/123456789/429827Cross-Tier Cooperation for Optimal Resource Utilization in Ultradense Heterogeneous Networksjournal article10.1109/tvt.2017.2732165