4G coverage mapping with an ultra-micro drone

Drone mapping of 4G cellular network coverage is presented using an ultra-micro drone of weight less then 300 g with a 1 hour flight time. The data show a 10 dB increase in RSSI (received signal strength indication) per 100 feet (30 m) of altitude gain. This method could be broadly adopted by cell phone carriers as an economical, efficient way to map 4G network coverage over large areas.