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For the safe operation of unmanned aircraft under Beyond LoS (Line-of-Sight) and Line of sight (LoS), three types of radio communication between UA & ground control are required, which is as follow [22]:

 1. Radiocommunication for the air traffic control relay.

 2. Radiocommunication for command and control.

 3. Radiocommunication for the sense and avoid function.

After this, it is left to the UA system designer to combine the links accordingly as per the needs of these three radiocommunications into a common physical link.