Method for reducing operation for removing self-interference in FDR environment and device therefor

• US 10,763,975 B2
• Filed: 07/07/2016
• Issued: 09/01/2020
• Est. Priority Date: 07/07/2016
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Dongkyu, Noh, Kwangseok, Lee, Sangrim, Lee, Hojae
• Primary Examiner(s): Cho, Hong S
• Application Number:
  US16/316,021
• Publication Number:
  US 20190245631A1
• Time in Patent Office: 1,517 Days
• Field of Search: None
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04B 15/02 Reducing interference from electric apparatus by means located at or near the interfering apparatus
• CPC Class Codes: H04B 15/04 the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/08 at the receiving station
• CPC Class Codes: H04B 7/0854 using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
• CPC Class Codes: H04L 5/1461 Suppression of signals in the return path, i.e. bidirectional control circuits

Abstract

A method by which a base station reduces an operation for removing self-interference in an FDR environment can comprise the steps of receiving estimated channel state information from a terminal, determining a beam forming value for transmission beamforming on the basis of the received channel state information, and transmitting a downlink signal by applying the determined beamforming value.

Claims

1. A method for reducing an operation for self-interference cancellation by a user equipment (UE) in a full duplex radio (FDR) environment, the method comprising:

performing channel estimation for a downlink signal transmitted from a base station (BS);

determining a beamforming value for transmission beamforming based on channel reciprocity property as a result of the channel estimation; and

transmitting an uplink signal by applying the determined beamforming value,

wherein the determined beamforming value is a value determined to cancel a difference between reception (RX) beam gains per RX antenna of the BS.

2. The method of claim 1, wherein the determined beamforming value is applied per transmission (TX) antenna of the UE.

3. A base station (BS) for performing communication to reduce an operation for self-interference cancellation in a full duplex radio (FDR) environment, the BS comprising:

a receiver configured to receive estimated channel state information from a user equipment (UE);

a processor configured to determine a beamforming value for transmission beamforming based on the received channel state information; and

a transmitter configured to transmit a downlink signal by applying the determined beamforming

wherein the determined beamforming value is a value determined to cancel a difference between reception (RX) beam gains per RX antenna of the BS.

4. A user equipment (UE) for performing communication to reduce an operation for self-interference cancellation in a full duplex radio (FDR) environment, the UE comprising:

a processor configured to;

perform channel estimation for a downlink signal transmitted from a base station (BS); and

determine a beamforming value for transmission beamforming based on channel reciprocity property as a result of the channel estimation; and

a transmitter configured to transmit an uplink signal by applying the determined beamforming value,

wherein the determined beamforming value is a value determined to cancel a difference between reception (RX) beam gains per RX antenna of the BS.

5. The UE of claim 4, wherein the determined beamforming value is applied per transmission (TX) antenna of the UE.