On the same day UQ WiMAX announced the installation of the 5000th base station , they also announced the availability of WiMAX Repeaters.
As any other wireless technology the biggest issue is Coverage. Or rather, how to provide the best coverage with lower costs. A repeater is a good solution to extend a cell (when more bandwidth is not needed).
A PDF from UQ [JP] shows 3 different repeaters and usage. Graphics are quite bad , but I’ll ignore it this time.