Method for operating a base station of a mobile radio system, signaling unit, control unit, mobile station and computer program

1. A method for operating a first base station of a first mobile radio system, comprising:

transmitting a first signal from a first mobile station to the first base station in a first frequency band;

influencing the first signal transmitted to the first base station with a second signal transmitted by a subscriber station of a second mobile radio system in a second frequency band adjacent to the first frequency band;

receiving the first signal at the first base station after the first signal is influenced; and

sending a third signal from a signaling unit of the first mobile radio system to reduce the influence of the signal transmitted by the subscriber station on the first signal wherein

the third signal of the signaling unit contains information serving to signal the first signal being influenced by the second signal,

the subscriber station receives the third signal,

the subscriber station is connected to a second base station of the second mobile radio system, and

the subscriber station sends the second base station information about the third signal.

2. The method as claimed in claim 1 , wherein

the second signal is transmitted as part of a connection in the second frequency band between the subscriber station and a second base station of the second mobile radio system, and

the signaling unit sends the third signal in a third frequency band provided within the second frequency band.

3. The method as claimed in claim 1 , wherein the information provides frequency information for the first frequency band.

4. The method as claimed in one of the claim 1 , wherein

the subscriber station receives the third signal,

the subscriber station measures a receiving power of the third signal, and

based on the receiving power, it is decided whether the subscriber station will be assigned a frequency band different from the second frequency band for transmissions from the subscriber station.

5. The method as claimed in claim 2 , wherein

the signaling unit transmits the third signal with a transmission power that severely disrupts at least the connection between the subscriber station and the second base station, and

the transmission power of the third signal causes a frequency band other than the second frequency band to be assigned to said connection between the subscriber station and the second base station.

6. The method as claimed in claim 1 , further comprising:

determining how much the first signal is influenced by the second signal, and

controlling a transmission power for the third signal as a function of how much the first signal is influenced by the second signal.

7. The method as claimed in claim 1 , wherein the third signal is transmitted by the signaling unit only if the second signal disrupts the first signal in an amount that exceeds a disruption limit.

8. The method as claimed in claim 1 ,

the second signal is transmitted as part of a connection in the second frequency band between the subscriber station and a second base station of the second mobile radio system, and

the third signal causes the connection between the subscriber station and the second base station to switch to a frequency band other than the second frequency band.

9. The method as claimed in claim 7 , wherein

the second signal is transmitted as part of a connection between the subscriber station and a second base station of the second mobile radio system,

as part of the connection between the subscriber station and the second base station, downlink signals are transmitted in the third frequency band from the second base station to the subscriber station, and

based on the third signal, the third frequency band is replaced by another frequency band of the second mobile radio system for downlink signals transmitted to the subscriber station.

10. The method as claimed in claim 7 , wherein

the second signal is transmitted as part of a connection between the subscriber station and a second base station of the second mobile radio system, and

based on the third signal, the second frequency band is replaced with another frequency band of the second mobile radio system for signals transmitted by the subscriber station of the second mobile radio system.

11. The method as claimed in claim 7 , wherein

the second signal is transmitted as part of a connection between the subscriber station and a second base station of the second mobile radio system, and

based on the third signal, the connection of the subscriber station is changed from the second base station to another base station of the second mobile radio system.

12. A signaling unit for a first mobile radio system having a first base station that receives a first signal in a first frequency band from a mobile station, the first signal received by the first base station being influenced by a second signal transmitted by a subscriber station of a second mobile radio system, the second signal being transmitted in a second frequency band adjacent to the first frequency band, the signaling unit comprising:

a signal generator to generate a third signal to reduce the influence of transmissions from the subscriber station of the second mobile radio system on the first signal; and

a transmitter to transmit the third signal wherein

the third signal of the signaling unit contains information serving to signal the first signal being influenced by the second signal,

the subscriber station receives the third signal,

the subscriber station is connected to a second base station of the second mobile radio system, and

the subscriber station sends the second base station information about the third signal.

13. The signaling unit as claimed in claim 12 wherein the signaling unit is part of the first base station.

14. The signaling unit as claimed in claim 12 , wherein the signaling unit is a distinct device separate from the first base station.

15. A control unit for allocating radio channels in a second mobile radio system having a subscriber station that transmits a second signal in a second frequency band, which second signal can influence a first signal transmitted by a mobile station to a first base station of a first mobile radio system, the first signal being transmitted in a first frequency band adjacent to the second frequency band

wherein the control unit assigns the subscriber station a frequency band different from the second frequency band as a function of a third signal sent by a signaling unit of the first mobile radio system wherein

the third signal of the signaling unit contains information serving to signal the first signal being influenced by the second signal,

the subscriber station receives the third signal,

the subscriber station is connected to a second base station of the second mobile radio system, and

the subscriber station sends the second base station information about the third signal.

16. A mobile station for a second mobile radio system, comprising:

a transmitter to transmit a second signal in a second frequency band, which is capable of influencing the quality of a first signal transmitted from a subscriber station to a first base station of a first mobile radio system, the first signal being transmitted in a first frequency band adjacent to the second frequency band; and

a receiver to receive a third signal from a signaling unit of the first mobile radio system, the mobile station reducing the influence of its transmissions on the first signal, based on the third signal wherein

the third signal of the signaling unit contains information serving to signal the first signal being influenced by the second signal,

the mobile station receives the third signal,

the mobile station is connected to a second base station of the second mobile radio system, and

the mobile station sends the second base station information about the third signal.

17. A computer readable storage medium containing a program which when executed by a computer performs a method for operating a first base station of a first mobile radio system, the method comprising:

transmitting a first signal from a first mobile station to the first base station in a first frequency band;

influencing the first signal transmitted to the first base station with a second signal transmitted by a subscriber station of a second mobile radio system in a second frequency band adjacent to the first frequency band;

receiving the first signal at the first base station after the first signal is influenced; and

sending a third signal from a signaling unit of the first mobile radio system to reduce the influence of the signal transmitted by the subscriber station on the first signal wherein

the third signal of the signaling unit contains information serving to signal the first signal being influenced by the second signal,

the subscriber station receives the third signal,

the subscriber station is connected to a second base station of the second mobile radio system, and

the subscriber station sends the second base station information about the third signal.