An important step in establishing a working HetNet solution is the effective co-location of different wireless solutions, notably within cities with high population densities. Some firms, such as HetNets Tower Corp., have developed unique deployment methods for large city areas to facilitate a wide range of wireless infrastructure elements, including small cells, Wi-Fi installations, macrocells, femtocells, and picocells. The company also points out the importance of understanding local permit procedures for these smaller wireless infrastructure installations and how such knowledge can minimize the costs of building and operating a HetNet-based wireless network.