Method and device for removing self-interference signal in environment using FDR mode

• US 10,333,570 B2
• Filed: 10/21/2015
• Issued: 06/25/2019
• Est. Priority Date: 01/23/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Dongkyu, Ko, Hyunsoo, Chung, Jaehoon, Choi, Kukheon, Noh, Kwangseok, Lee, Sangrim
• Primary Examiner(s): Bhatti, Hashim S
• Assistant Examiner(s): Ahmed, Abdullahi
• Application Number:
  US15/545,667
• Publication Number:
  US 20180019775A1
• Time in Patent Office: 1,343 Days
• CPC Class Codes: H04B 1/12 Neutralising, balancing, or compensation arrangements
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04B 1/56 with provision for simultaneous communication in two directions
• CPC Class Codes: H04B 15/02 Reducing interference from electric apparatus by means located at or near the interfering apparatus
• CPC Class Codes: H04B 17/14 of the whole transmission and reception path, e.g. self-test loop-back
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04B 7/0857 using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/12 by using return channel
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/1461 Suppression of signals in the return path, i.e. bidirectional control circuits

Abstract

A method for removing a self-interference signal by a device supporting an FDR mode can further comprise the steps of: transmitting a signal to a counterpart node in a predetermined time interval; generating, in an RF stage of the device, a residual self-interference signal after removal of an analog self-interference signal with respect to the signal and then storing same; and receiving from the counterpart node an ACK/NACK signal with respect to the transmission of the signal; and determining whether or not the stored residual self-interference signal is to be used thereafter on the basis of the ACK/NACK signal.

Claims

1. A method for performing self-interference signal cancellation by an apparatus supporting a full duplex communication (FDR) mode, the method comprising:

transmitting a signal to a target node in a predetermined time interval;

generating and storing a residual self-interference signal after cancelling an analog self-interference signal associated with the signal at a radiofrequency (RF) end of the apparatus;

receiving an acknowledgement/negative-acknowledgement (ACK/NACK) signal from the target node in response to the transmitted signal; and

determining whether to use the stored residual self-interference signal for canceling interference later based on the ACK/NACK signal.

2. The method of claim 1, further comprising:

when an ACK signal is received from the target node in response to the transmitted signal, determining to discard the stored self-interference signal.

3. The method of claim 1, further comprising:

when a NACK signal is received from the target node in response to the transmitted signal, determining whether a signal received in the predetermined time interval is successfully decoded.

4. The method of claim 3, further comprising:

retransmitting the signal to the target node; and

when the signal received in the predetermined time interval is successfully decoded, using the stored residual self-interference signal in cancelling a digital self-interference signal associated with the retransmission.

5. The method of claim 3, further comprising:

retransmitting the signal to the target node; and

when the signal received in the predetermined time interval is not successfully decoded, determining whether self-interference cancellation is successful.

6. The method of claim 5, wherein the success or failure of the self-interference cancellation is determined based on whether a predetermined number or more of consecutive ACK signals are received from the target node.

7. The method of claim 6, further comprising:

when it is determined that the self-interference cancellation is successful, using the stored residual self-interference signal in cancelling a digital self-interference signal associated with the retransmission.

8. The method of claim 6, further comprising:

when it is determined that the self-interference cancellation is not successful, discarding the stored residual self-interference signal.

9. An apparatus for performing self-interference signal cancellation, the apparatus supporting a full duplex communication (FDR) mode, the apparatus comprising:

a transmitted configured to transmit a signal to a target node in a predetermined time interval;

a radio frequency (RF) unit configured to generate and store a residual self-interference signal after cancelling an analog self-interference signal associated with the signal;

a receiver configured to receive a n acknowledgement/negative-acknowledgement (ACK/NACK) signal from the target node in response to the transmitted signal; and

a processor configured to determine whether to use the stored residual self-interference signal for canceling interference later based on the ACK/NACK signal.

10. The device of claim 9, wherein when an ACK signal is received from the target node in response to the transmitted signal, the processor is configured to determine to discard the stored self-interference signal.

11. The device of claim 9, wherein when the receiver receives a NACK signal from the target node in response to the transmitted signal, the processor is configured to determine whether a signal received in the predetermined time interval is successfully decoded.

12. The device of claim 11, wherein the transmitter is configured to retransmit the signal to the target node and wherein when the signal received in the predetermined time interval is successfully decoded, the RF unit is configured to use the stored residual self-interference signal in cancelling a digital self-interference signal associated with the retransmission.

13. The device of claim 11, wherein the transmitter is configured to retransmit the signal to the target node and wherein when the signal received in the predetermined time interval is not successfully decoded, the processor is configured to determine whether self-interference cancellation is successful.

14. The device of claim 13, wherein the processor is configured to determine the success or failure of the self-interference cancellation based on whether a predetermined number or more of consecutive ACK signals are received from the target node.

15. The device of claim 14, wherein when it is determined that the self-interference cancellation is successful, the RF unit is configured to use the stored residual self-interference signal in cancelling a digital self-interference signal associated with the retransmission.

16. The device of claim 14, wherein when it is determined that the self-interference cancellation is not successful, the processor is configured to discard the stored residual self-interference signal.