Cross-Tier Cooperation for Optimal Resource Utilization in Ultra-Dense Heterogeneous Networks.

Ultra-dense network is a promising technology for 5G cellular networks, and its approach is to densify the network to enhance system throughput via universal frequency reuse. Traditionally, macro cells and small cells usually operate on separate dedicated channels in the ultra-dense environment. This dedicated channel approach leads to resource underutilization because base stations may not be abl...