Method and arrangement for power control
View Patent ↗In radio communication between a central unit in an airborne vehicle and a radio communication terminal, the central unit controls a setting of transmission power depending on the altitude of the airborne vehicle during climbing and descending flight using hysteresis.
1. A method for transmission power control for radio communication between a central unit and a radio communication terminal, within a device which can fly, comprising:
controlling, by the central unit during climbing flight and descending flight, a setting of transmission power for the radio communication as a function of an altitude of the device using hysteresis, the transmission power being varied in steps.
2. The method as claimed in claim 1 , wherein said setting sets the transmission power additionally as a function of characteristics of an overflown environment.
3. The method as claimed in claim 2 , wherein geographic characteristics of at least one of the overflown environment and population density of the overflown environment are used as environmental characteristics.
4. The method as claimed in claim 2 , wherein geographic positions of terrestrial stations, in particular of terrestrial radio communication bas stations, are used as environmental characteristics.
5. The method as claimed in claim 1 , wherein said setting sets at least one of a first transmission power for radio communication from the central unit to the radio communication terminal, and a second transmission power for radio communication from the radio communication terminal to the central unit.
6. The method as claimed in claim 5 , wherein a base station of a radio communication system is used as the central unit.
7. The method as claimed in claim 6 , further comprising preventing, by a network monitoring unit connected to the central unit and with use of a noise power that is set as a function of the altitude, reception of terrestrial broadcast transmission channels where radio communication terminals are located inside the device which can fly.
8. The method as claimed in claim 7 , further comprising setting the noise power additionally as a function of the characteristics of the overflown environment.
9. The method as claimed in claim 8 , further comprising reducing the noise power of the network monitoring unit continually in steps above a minimum altitude, as the altitude increases.
10. A system for transmission power control of radio communication between a central unit and at least one radio communication terminal within a device which can fly, comprising:
a central unit engaging in radio communication with the at least one radio communication terminal including
a controller setting a transmission power to carry out the radio communication; and
a first setting means for varying transmission power in steps, during climbing and descending flight using hysteresis, as a function of altitude of the device which can fly.
11. The system as claimed in claim 10 , wherein said central unit further includes a second setting means for setting the transmission power based on characteristics of an overflown environment.
12. The system as claimed in claim 11 , wherein the second setting means varies the transmission power in steps.
13. The system as claimed in claim 12 , wherein the central unit is a base station.
14. The system as claimed in claim 13 , further comprising a network monitoring unit, connected to the central unit, supplied with information relating to at least one of the altitude and the overflown environment.
15. The system as claimed in claim 14 , wherein the network monitoring unit sets a noise power in a reception band of the radio communication terminals, or the central unit determines the noise power and transmits the noise power to the network monitoring unit to set the noise power.