Method for amplifying radio signals between a terminal device and an antenna in a first frequency band and in a second frequency band

1. A method for operating a circuit arrangement for amplifying radio signals between a terminal device and an antenna in a first frequency band and in a second frequency band, the first frequency band providing signal transmission according to a frequency division duplex (FDD) method, and the second frequency band providing signal transmission according to a time division duplex (TDD) method, comprising:

activating amplification of received signals in the first and second frequency bands in the absence of a transmission signal in the circuit arrangement in both the first frequency band and the second frequency band; and

in response to detecting a transmission signal in the circuit arrangement:

checking the detected transmission signal as to whether the detected transmission signal can be unambiguously assigned to the first frequency band or the second frequency band; and

if the check reveals that the detected transmission signal cannot be unambiguously assigned to the first frequency band or the second frequency band, activating a first transmission amplifier path for amplifying the transmission signal in the first frequency band, and activating a first receiving amplifier path for amplifying received signals in the first frequency band.

2. The method of claim 1 , wherein in the event that the check reveals that the detected transmission signal cannot be unambiguously assigned to the first frequency band or the second frequency band, a second transmission amplifier path for amplifying the transmission signal in the second frequency band is deactivated.

3. The method of claim 2 , wherein the first and second frequency bands are adjacent or overlapping frequency bands of the mobile radio network.

4. The method of claim 3 , wherein the check as to whether the detected transmission signal can be unambiguously assigned to the first frequency band or the second frequency band includes determining whether a detected signal level in one of the frequency bands is above a predetermined threshold value, and/or whether the detected signal level in one of the frequency bands is above the detected signal level in the other frequency band by a predetermined value.

5. The method of claim 1 , further comprising: if the check reveals that the detected transmission signal can be unambiguously assigned to the first frequency band or the second frequency band:

activating either the first transmission amplifier path or the second transmission amplifier path, and

deactivating the other transmission amplifier path.

6. The method of claim 1 , wherein if the transmission signal can be unambiguously assigned to the first frequency band or the second frequency band based on a time duration and/or a period duration of the transmission signal, the corresponding transmission and/or receiving amplifier path is/are activated.

7. The method of claim 6 , wherein if a time duration of the transmission signal exceeds a predetermined duration threshold, the first transmission and receiving amplifier paths are activated.

8. The method of claim 1 , wherein each of the transmission amplifier paths contains at least one transmission amplifier, and/or wherein each of the receiving amplifier paths contains at least one receiving amplifier.

9. The method of claim 1 , wherein a portion of the detected transmission signal is coupled out and transmitted to a detector unit.

10. The method of claim 9 , wherein a signal recognized by the detector unit is supplied to a control unit.

11. The method of claim 9 , wherein the detector unit provides, at least for the first frequency band and the second frequency band, a corresponding first and a corresponding second detector path, each detector path comprising one or more bandpass filters configured to filter signals in the respective frequency band.

12. The method of claim 1 , wherein the transmission signals are transmitted by a user terminal device, and wherein the received signals are received by an antenna unit.

13. The method of claim 1 , wherein the transmission signals and the received signals are divided by one of a diplexer, a coupler, or a switch before amplification by a respective amplifier path.