Methods of route directing unmanned aerial vehicles

A method of directing an unmanned aerial vehicle (UAV) flying in a particular direction towards a destination, the method being performed in a network entity of a communications system, wherein the network entity is separate from the UAV, and comprising:

• the network entity determining a location of the UAV;
• based on the determined location of the UAV, the network entity determining whether a criteria is satisfied;
• as a result of determining that the criteria is satisfied, the network entity transmitting to the UAV a warning message for indicating to the UAV that the UAV must change its velocity;
• obtaining position information identifying the UAV's current position;
• obtaining information identifying the destination for the UAV;
• defining a plurality of three dimensional roads, wherein each of the three dimensional roads corresponds to a different volume of airspace;
• selecting one of the plurality of three dimensional roads;
• and
• calculating a route along which the unmanned aerial vehicle is to travel using:
• the position information, the destination information, and the volume of airspace corresponding to the selected three dimensional road.