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Command & control is the typical link between the Control station and the unmanned aircraft. The following are two ways of communications:

The uplink: For sending telecommands to the aircraft for flight and navigation equipment control.

The downlink: To send telemetry (e.g. cruise speed, flight status) from the UA to the UACS. It is expected that in some flight conditions or in specific airspaces it could be necessary to downlink video streams.

This consideration is of higher importance for the work of the ITU-R related to Resolution 421 (WRC-07) and it must also be considered with the similar requirement that may come from the support of sense and avoid function and a requirement like these could lead to data rates of several hundreds of kbit/s per UA. In areas under the responsibility of the aeronautical authorities, it is expected that the command and control communications will have to be compliant with ICAO standards to be further specified on this function. However, in the periods where the UA will follow a fully autonomous flight, the up and downlinks could have very low data rates.