Method and device for self-interference cancellation in full-duplex communication system

Patent metadata

Field	Value
Publication number	US-10425215-B2
Application number	US-201615742699-A
Country	US
Kind code	B2
Filing date	Jun 30, 2016
Priority date	Jul 8, 2015
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

Disclosed is a 5G or pre-5G communication system to be provided for supporting a data transmission rate higher than that of a 4G communication system such as LTE. A method for cancelling self-interference in a full-duplex communication system is provided. The method comprises the steps of: cancelling cancellable self-interference components through an analog interference cancellation circuit, and estimating a channel state of an uplink channel and a channel state of a downlink channel on the basis of remaining residual self-interference components; estimating a channel capacity for each of possible beam combinations on the basis of the estimated uplink channel state and downlink channel state; selecting the beam combination having the largest channel capacity from among the possible beam combinations; and cancelling self-interference from a received signal on the basis of the selected beam combination.

First claim

The invention claimed is:

1. A method for cancelling self-interference (SI) by a communication apparatus in a full-duplex communication system, the method comprising:
estimating a channel state of an uplink (UL) channel and a channel state of a downlink (DL) channel;
estimating a channel capacity for at least one beam combination based on the estimated channel state of the UL channel and the estimated channel state of the DL channel;
selecting a beam combination corresponding to a greatest channel capacity from among the at least one beam combination;
determining whether a channel capacity for the selected beam combination is greater than a channel capacity estimated in a half-duplex communication system; and
cancelling SI from a received signal based on the selected beam combination in response to determining that the channel capacity for the selected beam combination is greater than the channel capacity estimated in the half-duplex communication system.

2. The method of claim 1 , wherein the estimating of the channel capacity comprises estimating the channel capacity for the at least one beam combination by applying a weight value based on a ratio of a traffic volume of the UL channel and a traffic volume of the DL channel.

3. The method of claim 1 , wherein the estimating of the channel capacity comprises estimating a channel capacity for each of the at least one beam combination based on a channel state for each stream related to a multi input multi output (MIMO) rank of the UL channel or the DL channel, if the UL channel or the DL channel is a MIMO channel.

4. The method of claim 1 , further comprising transmitting information related to the selected beam combination to a user equipment (UE).

5. The method of claim 1 , wherein the at least one beam combination comprises at least one of a transmission (Tx) beam/reception (Rx) beam combination of the eNB, a Tx beam/Rx beam combination of a DL, or a Tx beam/Rx beam combination in an UL.

6. The method of claim 1 , wherein the channel capacity estimated in the half-duplex communication system includes
a sum of a channel capacity of the UL channel and a channel capacity of the DL channel, which are estimated in the half-duplex communication system.

7. The method of claim 1 , further comprising:
selecting a new beam combination if the channel capacity for the selected beam combination is less than or equal to the channel capacity estimated in the half-duplex communication system; and
cancelling SI from a received signal based on the selected new beam combination.

8. The method of claim 1 , wherein the selecting of the beam combination corresponding to the greatest channel capacity comprises searching for both a Tx beam and an Rx beam or searching for one of the Tx beam and the Rx beam.

9. A communication apparatus which is communicable in a full-duplex communication system, the communication apparatus comprising:
a transceiver; and
at least one processor connected to the transceiver,
wherein the at least one processor is configured to:
estimate a channel state of an uplink (UL) channel and a channel state of a downlink (DL) channel,
estimate a channel capacity for at least one beam combination based on the estimated channel state of the UL channel and the estimated channel state of the DL channel,
select a beam combination corresponding to a greatest channel capacity from among the at least one beam combination,
determine whether a channel capacity for the selected beam combination is greater than a channel capacity estimated in a half-duplex communication system, and
cancel SI from a received signal based on the selected beam combination in response to determining that the channel capacity for the selected beam combination is greater than the channel capacity estimated in the half-duplex communication system.

10. The communication apparatus of claim 9 , wherein the at least one processor is further configured to estimate the channel capacity for the at least one beam combination by applying a weight value based on a ratio of a traffic volume of the UL channel and a traffic volume of the DL channel.

11. The communication apparatus of claim 9 , wherein the at least one processor is further configured to estimate a channel capacity for at least one beam combination based on a channel state for each stream related to a multi input multi output (MIMO) rank of the UL channel or the DL channel, if the UL channel or the DL channel is a MIMO channel.

12. The communication apparatus of claim 9 , wherein the at least one beam combination comprise at least one of a transmission (Tx) beam/reception (Rx) beam combination of the eNB, a Tx beam/Rx beam combination of a DL, or a Tx beam/Rx beam combination in an UL.

13. The communication apparatus of claim 9 , wherein the channel capacity estimated in the half-duplex communication system includes a sum of a channel capacity of the UL channel and a channel capacity of the DL channel, which are estimated in the half-duplex communication system.

14. The communication apparatus of claim 9 , wherein the at least one processor is further configured to select a new beam combination if the channel capacity for the selected beam combination is less than or equal to the channel capacity estimated in the half-duplex communication system and to cancel SI from a received signal based on the selected new beam combination.

15. The communication apparatus of claim 9 , wherein the at least one processor is further configured to select the beam combination corresponding to the greatest channel capacity by searching for both a Tx beam and an Rx beam or searching for one of the Tx beam and the Rx beam.

16. The communication apparatus of claim 9 , wherein the at least one processor is further configured to control the transceiver to transmit information related to the selected beam combination to a user equipment (UE).

17. The communication apparatus of claim 9 , wherein the channel state of the UL channel and the DL channel is estimated based on performing of a beam sweeping with a UE.

18. The communication apparatus of claim 9 , wherein the at least one processor is further configured to estimate an UL SI channel for the beam combinations based on the channel state of the DL channel, and to obtain a residual SI component being cancelled an SI component cancellable by an analog interference cancellation circuit from the estimated UL SI.

19. The method of claim 1 , wherein the channel state of the UL channel and the DL channel is estimated based on performing of a beam sweeping with a UE.

20. The method of claim 1 , further comprising:
estimating an UL SI channel for the beam combinations based on the channel state of the DL channel; and
obtaining a residual SI component being cancelled an SI component cancellable by an analog interference cancellation circuit from the estimated UL SI.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Byung-Hwan
• Lim Jong-Bu
• Seol Ji-Yun
• Lim Chae-Hee
• Jeong Su-Ryong
• Hong Sung-Nam

Classifications

• H04B1/525

  with means for reducing leakage of transmitter signal into the receiver · CPC title

• H04W72/046

  the resource being in the space domain, e.g. beams · CPC title

• H04J11/0036

  at the receiver · CPC title

• H04B7/063

  Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection · CPC title

• H04L5/0023

  Time-frequency-space · CPC title