Crossover isolation reduction in a signal booster

1. A repeater, comprising:

a first-direction signal path for a first-direction band;

a second-direction signal path for a second-direction band; and

a controller configured to:

decrease a gain of the first-direction signal path by a first amount; and

increase a gain of the second-direction signal path by a second amount when the gain of the first-direction signal path is decreased by the first amount to enable a total loop gain of the first-direction signal path and the second-direction signal path to be less than a total loop crossover isolation level of the first-direction signal path and the second-direction signal path.

2. The repeater of claim 1 , wherein the total loop gain of the first-direction signal path and the second-direction signal path is to be less than a total loop crossover isolation level of the first-direction signal path and the second-direction signal path in accordance with a crossover isolation requirement for the repeater.

3. The repeater of claim 1 , wherein the controller is configured to decrease the gain of the first-direction signal path by the first amount in order to reduce or mitigate an increase in a crossover isolation requirement for the repeater caused by an increase to the gain of the second-direction signal path by the second amount.

4. The repeater of claim 3 , wherein reduction or mitigation of the increase in the crossover isolation requirement for the repeater caused by the increase to the gain of the second-direction signal path enables a reduced number of bandpass filters in the repeater and a reduced passband amplitude ripple for the repeater.

5. The repeater of claim 1 , wherein the first amount is greater than or equal to the second amount.

6. The repeater of claim 1 , wherein:

the gain of the first-direction signal path is decreased before the gain of the second-direction signal path is increased; or

the gain of the first-direction signal path is decreased at substantially the same time as when the gain of the second-direction signal path is increased.

7. The repeater of claim 1 , wherein the controller is configured to decrease the gain of the first-direction signal path by the first amount by disabling a gain stage in the first-direction signal path.

8. The repeater of claim 1 , wherein the controller is configured to increase the gain of the second-direction signal path by the second amount to determine an oscillation margin between an operating gain for the second-direction signal path and an oscillation point for the second-direction signal path.

9. The repeater of claim 1 , wherein the controller is configured to mitigate an oscillation in the repeater by decreasing the gain of the second-direction signal path until the oscillation ceases in the repeater.

10. The repeater of claim 1 , wherein the controller is configured to:

restore the gain of the first-direction signal path to a previous amount or a new amount after mitigation of an oscillation in the repeater; and

restore the gain of the second-direction signal path to a previous amount or a new amount after mitigation of the oscillation in the repeater.

11. The repeater of claim 1 , wherein:

the first-direction signal path includes one or more amplifiers and one or more filters to amplify and filter signals in the first-direction band; and

the second-direction signal path includes one or more amplifiers and one or more filters to amplify and filter signals in the second-direction band.

12. The repeater of claim 1 , wherein:

the first-direction signal path is an uplink signal path and the first-direction band is an uplink band; and

the second-direction signal path is a downlink signal path and the second-direction band is a downlink band.

13. The repeater of claim 1 , wherein:

the first-direction signal path is a downlink signal path and the first-direction band is a downlink band; and

the second-direction signal path is an uplink signal path and the second-direction band is an uplink band.

14. The repeater of claim 1 , further comprising a plurality of signal paths for a plurality of bands, wherein an increase in a crossover isolation requirement is reduced or mitigated for each of the plurality of bands.

15. The repeater of claim 1 , wherein the first amount and the second amount are represented in decibels (dB).

16. The repeater of claim 1 , wherein the controller is configured to:

decrease the gain of the first-direction signal path by increasing an attenuation level in the first-direction signal path or by adjusting a variable gain amplifier in the first-direction signal path; or

increase the gain of the second-direction signal path by decreasing an attenuation level in the second-direction signal path or by adjusting a variable gain amplifier in the second-direction signal path.

17. A repeater, comprising:

a first-direction signal path for a first-direction band;

a second-direction signal path for a second-direction band; and

a controller configured to:

disable a gain stage in the first-direction signal path; and

increase a gain in the second-direction signal path by a selected amount when the gain stage is disabled in the first-direction signal path to enable a total loop gain of the first-direction signal path and the second-direction signal path to be less than a total loop crossover isolation level of the first-direction signal path and the second-direction signal path.

18. The repeater of claim 17 , wherein the total loop gain of the first-direction signal path and the second-direction signal path is to be less than a total loop crossover isolation level of the first-direction signal path and the second-direction signal path in accordance with a crossover isolation requirement for the repeater.

19. The repeater of claim 17 , wherein the controller is configured to disable the gain stage in the first-direction signal path in order to reduce or mitigate an increase in a crossover isolation requirement for the repeater caused by an increase to the gain of the second-direction signal path by the selected amount.

20. The repeater of claim 19 , wherein reduction or mitigation of the increase in the crossover isolation requirement for the repeater caused by the increase to the gain of the second-direction signal path enables a reduced number of bandpass filters in the repeater and a reduced passband amplitude ripple for the repeater.

21. The repeater of claim 17 , wherein the controller is configured to increase the gain of the second-direction signal path by the selected amount to determine an oscillation margin between an operating gain for the second-direction signal path and an oscillation point for the second-direction signal path.

22. The repeater of claim 17 , wherein the controller is configured to mitigate an oscillation in the repeater by decreasing the gain of the second-direction signal path until the oscillation ceases in the repeater.

23. The repeater of claim 17 , wherein the controller is configured to:

restore the gain of the first-direction signal path to a previous amount or a new amount after mitigation of an oscillation in the repeater; and

restore a gain of the second-direction signal path to a previous amount or a new amount after mitigation of the oscillation in the repeater.

24. The repeater of claim 17 , wherein:

the first-direction signal path is an uplink signal path and the first-direction band is an uplink band; and

the second-direction signal path is a downlink signal path and the second-direction band is a downlink band.

25. The repeater of claim 17 , wherein:

the first-direction signal path is a downlink signal path and the first-direction band is a downlink band; and

the second-direction signal path is an uplink signal path and the second-direction band is an uplink band.

26. A method for operating a signal booster, the method comprising:

decreasing, at a controller in the signal booster, a gain of a first-direction signal path in the signal booster by a first amount; and

increasing, at the controller, a gain of a second-direction signal path in the signal booster by a second amount when the gain of the first-direction signal path is decreased by the first amount,

wherein the gain of the first-direction signal path is decreased by the first amount in order to reduce or mitigate an increase in a crossover isolation requirement for the signal booster caused by an increase to the gain of the second-direction signal path by the second amount.

27. The method of claim 26 , wherein the crossover isolation requirement specifies that a total loop gain of the first-direction signal path and the second-direction signal path is to be less than a total loop crossover isolation level of the first-direction signal path and the second-direction signal path.

28. The method of claim 26 , further comprising decreasing the gain of the first-direction signal path by the first amount by disabling a gain stage in the first-direction signal path.

29. The method of claim 26 , further comprising increasing the gain of the second-direction signal path by the second amount for determining an oscillation margin between an operating gain for the second-direction signal path and an oscillation point for the second-direction signal path.

30. The method of claim 26 , further comprising mitigating an oscillation in the signal booster by decreasing the gain of the second-direction signal path until the oscillation ceases in the signal booster.

31. The method of claim 26 , further comprising:

restoring the gain of the first-direction signal path to a previous amount or a new amount after mitigation of an oscillation in the signal booster; and

restoring the gain of the second-direction signal path to a previous amount or a new amount after mitigation of the oscillation in the signal booster.

32. The method of claim 26 , wherein the first amount is greater than or equal to the second amount.