Method and apparatus for removing interference by using network in downlink transmission of cellular communication system using orthogonal frequency division multiplexing method

Patent metadata

Field	Value
Publication number	US-2017366289-A1
Application number	US-201515537035-A
Country	US
Kind code	A1
Filing date	Dec 15, 2015
Priority date	Dec 18, 2014
Publication date	Dec 21, 2017
Grant date	—

Abstract

The present invention presents a method by which a base station notifies a terminal of information on a tone into which interference caused by surrounding cells greatly flows, and by which a terminal uses the information so as to efficiently remove the interference caused by the surrounding cells and to demodulate data channels, such that the method improves reception performance. Particularly, when the surrounding cells transmit cell-specific reference signals, the base station transmits, to the terminal, location information of the cell-specific reference signals transmitted by the surrounding cells, and the terminal demodulates the received data except for a data channel tone in which cell-specific reference signals of the surrounding cells greatly cause interference. The present invention can improve data reception performance by efficiently removing the interference caused by the surrounding cells.

First claim

1 . A method for transmitting interference cancellation information from a base station to a terminal in an Orthogonal Frequency Division Multiplexing (OFDM) wireless communication system, the method comprising:
collecting, at the base station, information on a neighboring cell causing interference equal to or greater than a predetermined threshold to the terminal; generating the interference cancellation information for use in data channel demodulation of the terminal based on the neighboring cell information; and transmitting the interference cancellation information to the terminal.

2 . The method of claim 1 , wherein the neighboring cell information comprises at least one of a physical cell identifier of the neighboring cell, amount of the interference caused by the neighboring cell to the terminal, presence/absence of a data signal from the neighboring cell to a terminal being served by the neighboring cell while the base station transmits data signals to the terminal, and frequency of data signal transmission from the neighboring cell to the terminal being served by the neighboring cell.

3 . The method of claim 1 , wherein the interference cancellation information comprises at least one of a specific-data channel tone handling scheme to be applied in the data channel demodulation and positions of specific data channel tones at which neighboring cell interference is present.

4 . The method of claim 3 , wherein the specific data channel tones are data channel tones overlapped in position with cell-specific reference signal tones of the neighboring cell in a frequency-time resource grid.

5 . The method of claim 4 , wherein the interference cancellation information is a 2-bit or 5-bit information indicating the cell-specific reference signal tones of the neighboring cell.

6 . A method for a terminal to demodulate a data channel based on interference cancellation information received from a base station in an Orthogonal Frequency Division Multiplexing (OFDM) wireless communication system, the method comprising:
receiving the interference cancellation information generated based on information on a neighboring cell causing interference equal to or greater than a predetermined threshold to the terminal for use in data channel demodulation of the terminal; receiving the data channel from the base station; and demodulating the data channel based on the interference cancellation information.

7 . The method of claim 6 , wherein the neighboring cell information comprises at least one of a physical cell identifier of the neighboring cell, amount of the interference caused by the neighboring cell, presence/absence of a data signal from the neighboring cell to a terminal being served by the neighboring cell while the base station transmits data signals to the terminal, and frequency of data signal transmission from the neighboring cell to the terminal being served by the neighboring cell.

8 . The method of claim 6 , wherein the interference cancellation comprises at least one of a specific-data channel tone handling scheme to be applied in the data channel demodulation and positions of specific data channel tones at which neighboring cell interference is present.

9 . The method of claim 8 , wherein demodulating the data channel comprises excluding specific data channel tones from demodulation among data channel tones constituting the data channel.

10 . The method of claim 8 , wherein the specific data channel tones are data channel tones overlapped in position with cell-specific reference signal tones of the neighboring cell in a frequency-time resource grid.

11 . The method of claim 10 , wherein the interference cancellation information is a 2-bit or 5-bit information indicating the cell-specific reference signal tones of the neighboring cell.

12 . A base station for transmitting interference cancellation information to a terminal in an Orthogonal Frequency Division Multiplexing (OFDM) wireless communication system, the base station comprising:
a transceiver which transmits/receives signals; and
a controller which controls to collect information on a neighboring cell causing interference equal to or greater than a predetermined threshold to the terminal, to generate the interference cancellation information for use in data channel demodulation of the terminal based on the neighboring cell information, and to transmit the interference cancellation information to the terminal.

13 . The base station of claim 12 , wherein the neighboring cell information comprises at least one of a physical cell identifier of the neighboring cell, amount of the interference caused by the neighboring cell, presence/absence of a data signal from the neighboring cell to a terminal being served by the neighboring cell while the base station transmits data signals to the terminal, and frequency of data signal transmission from the neighboring cell to the terminal being served by the neighboring cell.

14 . The base station of claim 12 , wherein the interference cancellation information comprises at least one of a specific-data channel tone handling scheme to be applied in the data channel demodulation and positions of specific data channel tones at which neighboring cell interference is present.

15 . The base station of claim 14 , wherein the specific data channel tones are data channel tones overlapped in position with cell-specific reference signal tones of the neighboring cell in a frequency-time resource grid.

16 . The base station of claim 15 , wherein the interference cancellation information is a 2-bit or 5-bit information indicating the cell-specific reference signal tones of the neighboring cell.

17 . A terminal for demodulating a data channel based on interference cancellation information received from a base station in an Orthogonal Frequency Division Multiplexing (OFDM) wireless communication system, the terminal comprising:
a transceiver which transmits/receives signals; and a controller which controls to receive the interference cancellation information generated based on information on a neighboring cell causing interference equal to or greater than a predetermined threshold to the terminal for use in data channel demodulation of the terminal, to receive the data channel from the base station, and to demodulate the data channel based on the interference cancellation information.

18 . The terminal of claim 17 , wherein the neighboring cell information comprises at least one of a physical cell identifier of the neighboring cell, amount of the interference caused by the neighboring cell, presence/absence of a data signal from the neighboring cell to a terminal being served by the neighboring cell while the base station transmits data signals to the terminal, and frequency of data signal transmission from the neighboring cell to the terminal being served by the neighboring cell.

19 . The terminal of claim 17 , wherein the interference cancellation comprises at least one of a specific-data channel tone handling scheme to be applied in the data channel demodulation and positions of specific data channel tones at which neighboring cell interference is present.

20 . The terminal of claim 19 , wherein the controller controls the terminal to exclude specific data channel tones from demodulation among data channel tones constituting the data channel.

21 . The terminal of claim 19 , wherein the specific data channel tones are data channel tones overlapped in position with cell-specific reference signal tone

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kang Jeewoong
• Jo Sungkwon
• Nahm Seunghyeon

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04J2011/0096

  Network synchronisation · CPC title

• H04W72/042

  Electricity · mapped topic

• H04J11/005 Primary

  of intercell interference · CPC title

• H04J2011/0009

  with FDM/FDMA · CPC title