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The unmanned aircraft system (UAS) or UAV is facing enormous growth from capital as well as the technological point of view. The number of drones in operation is increasing in gigantic number, with several million produced annually in recent years. The scale and mass of drones vary from micro-drones weighing a few grams to heavy gigantic machines as big as the size of almost a commercial aircraft.

According to ICAO (International Civil Aviation Organization), UAS has been classified broadly into two categories:

 • Remotely-piloted Aircraft systems: It consists of various elements which include unmanned aircraft, ground control & some necessary command and control links, or any other element which is configurable together and is required for flight operation.

 • Autonomous aircraft: It is an unmanned aircraft which don’t require pilot involvement in the controlling or management of the flying aircraft [20].

Communication is a key aspect of the UAS system due to the presence of a human in a remote place. Therefore, the operation of UAS depends upon communication which enables safe UAS operation in non-segregated airspaces.