Technology for a repeater is disclosed. The repeater can measure a first power level within a passband. The repeater can adjust a gain of the repeater by a selected amount. The repeater can measure a second power level within the passband. The repeater can calculate a difference between the first power level and the second power level. The repeater can determine that the repeater is approaching an oscillation when the difference is different than a selected amount by a predetermined threshold.

According to an aspect of the inventive concept, there is provided an interference cancellation repeater includes: a signal transceiver configured to cancel an interference signal from an RF input signal and to output an RF output signal from which the interference signal has been canceled; and a controller configured to control a power mode of the signal transceiver by measuring traffic of a first signal in the signal transceiver.

An interference cancellation repeater according to the inventive concept includes: a first transmission/reception processing unit configured to adjust a gain of a radio frequency (RF) input signal input via a link antenna communicatively coupled to a base station; an interference canceller configured to cancel and output an interference signal from an output signal of the first transmission/reception processing unit; and a gain controller configured to extract a signal with constant magnitude regardless of a change in user traffic from the output signal of the interference canceller, and to adjust the gain of the RF input signal to a predetermined level by controlling the first transmission/reception processing unit based on the extracted signal.

Certain features relate to operating a distributed antenna system or repeater system communicating frequency-division duplexing (FDD) signals in a time-division duplexing (TDD) mode. A TDD mode scheduler is configured for monitoring a downlink communications channel for the start of a downlink frame, sub-frame, or resource slot. Based on the start of a downlink frame, sub-frame, or resource slot, the TDD mode scheduler can identify a TDD transmission time-slot. The TDD mode scheduler can schedule high-powered downlink sub-frames during the TDD transmission time-slots where higher power output may be desirable. Based on the indication of the TDD transmission time-slot, a transmit/receive controller can increase the gain of the downlink communication and reduce the gain of the uplink communication.

Technology for a repeater is disclosed. The repeater can include one or more amplification and filtering signal paths. The repeater can include a controller. The controller can detect an oscillation in the repeater. The controller can reduce a gain in the repeater by a first amount to cease the oscillation in the repeater. The controller can reduce the gain in the repeater further by a second amount to create an oscillation margin. The controller can modify the gain in the repeater further by a third amount to create an offset to the oscillation margin.

A device for processing an input signal, including a local oscillator, designed to generate an oscillator signal; a subtracting unit, designed to subtract an amplified correction signal from the input signal in order to generate a corrected input signal; a downmixer, designed to mix the corrected input signal downward to an intermediate frequency using the oscillator signal in order to generate a difference signal; a first amplifier unit, designed to amplify the difference signal in order to generate and output an output signal; a correcting unit, designed to suppress a predefined frequency range of the output signal in order to generate a correction-difference signal; an upmixer, designed to mix the correction-difference signal upward using the oscillator signal in order to generate a correction signal; and a second amplifier unit, designed to amplify the correction signal in order to generate the amplified correction signal.

Technology for a repeater is disclosed. The repeater can include a first-direction signal path, a second-direction signal path and a controller. The controller can set a first gain for the first-direction signal path based on a second-direction received signal level. The controller can set a second gain for the second-direction signal path based on the second-direction received signal level with a differential with respect to the first gain. The differential between the first gain and the second gain can be set for a first signal type. The controller can adjust the differential between the first gain and the second gain for a second signal type.

Provided is a wireless communication method and related apparatus. In the method, a base station receives a capability of a repeater, and if a repeater gain of the repeater is allowed to be increased based on the capability of the repeater, the base station requires at least one user equipment to reduce transmit power and use the reduced transmit power to transmit uplink signals. With this method, the transmit power of the user equipment served by the repeater can be effectively reduced to get the benefit of saving UE's power consumption.

Certain features relate to operating a distributed antenna system or repeater system communicating frequency-division duplexing (FDD) signals in a time-division duplexing (TDD) mode. A TDD mode scheduler is configured for monitoring a downlink communications channel for the start of a downlink frame, sub-frame, or resource slot. Based on the start of a downlink frame, sub-frame, or resource slot, the TDD mode scheduler can identify a TDD transmission time-slot. The TDD mode scheduler can schedule high-powered downlink sub-frames during the TDD transmission time-slots where higher power output may be desirable. Based on the indication of the TDD transmission time-slot, a transmit/receive controller can increase the gain of the downlink communication and reduce the gain of the uplink communication.

Technology for a signal booster operable to mitigate an oscillation is disclosed. The signal booster can include a signal path configured to carry a signal in a defined band. The signal booster can include a controller configured to detect an oscillation in the signal booster. The controller can determine a range of signal attenuation levels that are applicable by the controller. The controller can apply one or more signal attenuation levels within the range of signal attenuation levels to the signal booster to mitigate the oscillation. A signal attenuation level can be iteratively adjusted until a minimum signal attenuation level within the range of signal attenuation levels is applied that mitigates the oscillation in the signal booster.