Method of performing power control and link adaptation in full duplex radio communication system and apparatus for the same
Disclosed herein is method of performing self-interference cancellation in the network nodes supporting full-duplex communication. Specifically, the method includes receiving a desired signal from a user equipment (UE), performing cancellation of self-interference according to a transmitted signal of the network node, the transmitted signal using the same radio resource as the desired signal, determining whether the cancellation of the self-interference is successful, performing, upon determining that the cancellation of the self-interference is successful, decoding of the desired signal and checking cyclic redundancy check (CRC), and performing power control and link adaptation depending on success in performing the cancellation of the self-interference and a result of checking the CRC.
1. A method of performing self-interference cancellation in a network node supporting full-duplex communication, the method comprising:
receiving a desired signal from a user equipment (UE);
performing cancellation of self-interference according to a transmitted signal of the network node, the transmitted signal using the same radio resource as the desired signal;
determining whether the cancellation of the self-interference is successful according to a difference of an error vector magnitude (EVM),
wherein the cancellation of the self-interference is determined to be failed, when the difference of the error vector magnitude (EVM) from the constellation point is greater than a threshold in a demodulation operation, and
wherein whether the difference is greater than the threshold is determined based on whether a strength of residual self-interference and a strength of the desired signal exceed a threshold after the cancellation of the self-interference;
performing, upon determining that the cancellation of the self-interference is successful, decoding of the desired signal and checking cyclic redundancy check (CRC); and
performing power control and link adaptation depending on success in performing the cancellation of the self-interference and a result of checking the CRC.
2. The method according to claim 1 , wherein, when it is determined that the cancellation of the self-interference has failed, it is determined that the decoding of the desired signal has failed.
3. The method according to claim 1 , wherein the performing of the power control and link adaptation comprises:
reducing a transmit power when the cancellation of the self-interference has failed.
4. The method according to claim 1 , wherein the performing of the power control and link adaptation comprises:
raising a modulation and coding scheme (MCS) level when the cancellation of the self-interference and the CRC are successful.
5. The method according to claim 1 , wherein the performing of the power control and link adaptation comprises:
lowering a modulation and coding scheme (MCS) level when the cancellation of the self-interference is successful and the CRC fails.
6. A network node for supporting full-duplex communication and performing self-interference cancellation, the network node comprising:
a radio frequency (RF) unit; and
a processor, wherein the processor is configured to:
receive a desired signal from a user equipment (UE);
perform cancellation of self-interference according to a transmitted signal of the network node, the transmitted signal using the same radio resource as the desired signal;
determine whether the cancellation of the self-interference is successful according to a difference of an error vector magnitude (EVM),
wherein the cancellation of the self-interference is determined to be failed, when the difference of the error vector magnitude (EVM) from the constellation point is greater than a threshold in a demodulation operation, and
wherein whether the difference is greater than the threshold is determined based on whether a strength of residual self-interference and a strength of the desired signal exceed a threshold after the cancellation of the self-interference;
perform, upon determining that the cancellation of the self-interference is successful, decoding of the desired signal and checking cyclic redundancy check (CRC); and
perform power control and link adaptation depending on success in performing the cancellation of the self-interference and a result of checking the CRC.