Provided is a wireless communication method and related apparatus. In the method, a repeater reports a capability of the repeater to the base station for the base station to determine a repeater gain, and the repeater utilizes the repeater gain designated by the base station to amplify a received signal transmitted to or from the at least one user equipment served by the repeater. With this method, multipath or multi-user interference introduced by the repeater to the mobile network can be minimized. In addition, the transmit power of the user equipment served by the repeater can be effectively reduced.

Provided is a signal forwarding method and related apparatus. In the method, a repeater determines which part of received signals, which are the cellular communication signals, are to be forwarded, according to a control of the network, and then utilizes a gain of the repeater to amplify the determined signals and forwarding the amplified signals. With this method, the effective power spectrum density transmitted by the repeater becomes larger. Multipath or multi-user interference may also be minimized.

Provided is a control method and related apparatus. In the method, the base station obtains first information on which third devices the second device can directly serve and second information on which third devices the at least one first device can serve, and based on the first information and the second information, the base station determines which third device the second device will serve directly and which third device the at least one first device will serve. With this method, multipath or multi-user interference introduced by the repeater to the mobile network can be minimized.

An interference cancellation repeater includes: a first transmission/reception processing unit configured to convert a radio frequency (RF) input signal input via a link antenna communicatively coupled to a base station into a digital input signal; an interference canceller configured to cancel an interference signal from the digital input signal and to output an interference canceled signal; a second transmission/reception processing unit configured to convert the interference canceled signal into an RF output signal and to amplify the RF output signal; and a gain controller configured to detect a gain change of the interference cancellation repeater based on the interference canceled signal and to change a current gain of the interference cancellation repeater to a target gain by adjusting intensity of at least one of the RF input signal, the interference canceled signal, and the RF output signal when the gain change of the interference cancellation repeater is detected.

Technology for a repeater is disclosed. The repeater can include a first-direction signal path for a first-direction band. The repeater can include a second-direction signal path for a second-direction band. The repeater can include a controller configured to decrease a gain of the first-direction signal path by a first amount. The controller can 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.

A method includes inserting a first reference signal and a plurality of bit fields on a first channel, to produce a first signal, where the plurality of bit fields includes a first bit field indicating whether a second reference signal is transmitted on a second channel, a second bit field indicating whether the first reference signal has the same precoding as the second reference signal, a third bit field indicating whether precoding of the first reference signal is similar to precoding of the second reference signal, or a fourth bit field indicating transmission precoding differences between the first reference signal and the second reference signal. The method also includes performing precoding on the first signal, to produce a first transmission signal, performing precoding on the second channel, to produce a second transmission signal, transmitting, to a receiver, the first transmission signal and transmitting, to the receiver, the second transmission signal.

The methods and systems for amplify-and-forward (in-band) relaying relate to beamforming techniques including receive and transmit beamforming for reducing self-interference, and improving Signal-to-Noise Ratio (SNR), or Signal to Interference plus Noise Ratio (SINR), of an incoming signal (to be relayed). The incoming signal is amplified and retransmitted simultaneously with the incoming signal, and over the same frequency band as that of an incoming signal.

An apparatus for repeating signals includes a receive antenna for capturing a receive signal, processing circuitry for processing the receive signal to form a repeated signal, and a transmit antenna for transmitting the repeated signal. The processing circuitry includes gain circuitry for gain in the repeated signal and decorrelation circuitry configured for modifying the repeated signal with respect to the receive signal to thereby decorrelate the repeated signal from the receive signal. The processing circuitry further comprises circuitry configured for calculating a gain margin for the apparatus utilizing the decorrelated receive and repeated signals.

A repeater system includes a first repeater device that receives a first beam of radio frequency (RF) signal from a first network node and a second repeater device that receives a second beam of RF signal from the first network node. The first repeater device controls the second repeater device to provide the first beam of RF signal and the second beam of RF signal to a second network node and select a plurality of signal parameters at the first repeater device and the second repeater device for the first beam of RF signal and the second beam of RF signal respectively, based on a plurality of measurements. The first repeater device further controls the second repeater device to establish an additional link with the second repeater device to create an additional dimension in a MIMO channel between the first network node and the second network node.

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.