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-10014969-B2
Application number	US-201515537035-A
Country	US
Kind code	B2
Filing date	Dec 15, 2015
Priority date	Dec 18, 2014
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

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

The invention claimed is:

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:
identifying, by the base station, information on a neighboring cell causing an interference equal to or greater than a predetermined threshold to the terminal;
determining a specific-data channel tone handling scheme for specific-data channel tones, the specific-data channel tone handling scheme being one of an exclusion of the specific-data channel tones from data demodulation or an inclusion of the specific-data channel tones with lower weight than other data channel tones to the data demodulation;
generating the interference cancellation information including the specific-data channel tone handling scheme and information on positions of the specific-data channel tones for use in the data 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, information on presence or 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 a frequency of data transmission from the neighboring cell to the terminal being served by the neighboring cell.

3. The method of claim 1 , wherein the specific data channel tones are data channel tones overlapped in position with cell-specific reference signal tones of the neighboring cell.

4. The method of claim 3 , wherein the interference cancellation information includes 2 bit or 5-bit information indicating positions of the cell-specific reference signal tones of the neighboring cell.

5. 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 including a specific-data channel tone handling scheme and information on positions of specific-data channel tones, the interference cancellation information being generated based on information on a neighboring cell causing an interference equal to or greater than a predetermined threshold to the terminal for use in data demodulation of the terminal;
receiving data on data channel tones from the base station; and
demodulating the data channel based on the interference cancellation information,
wherein the specific-data channel tone handling scheme is one of an exclusion of the specific-data channel tones from the data demodulation or an inclusion of the specific-data channel tones with lower weight than other data channel tones to the data demodulation.

6. The method of claim 5 , 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, information on presence or 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 a frequency of data transmission from the neighboring cell to the terminal being served by the neighboring cell.

7. The method of claim 5 , wherein demodulating the data channel comprises excluding the specific data channel tones from the data demodulation among the data channel tones.

8. The method of claim 5 , wherein the specific data channel tones are data channel tones overlapped in position with cell-specific reference signal tones of the neighboring cell.

9. The method of claim 8 , wherein the interference cancellation information includes 2-bit or 5-bit information indicating positions of the cell-specific reference signal tones of the neighboring cell.

10. 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 to transmit and receive signals; and
a controller configured to control to identify information on a neighboring cell causing an interference equal to or greater than a predetermined threshold to the terminal, determine a specific-data channel tone handling scheme for specific-data channel tones, the specific-data channel tone handling scheme being one of an exclusion of the specific-data channel tones from data demodulation or an inclusion of the specific-data channel tones with lower weight than other data channel tones to the data demodulation, generate the interference cancellation information including the specific-data channel tone handling scheme and information on positions of the specific-data channel tones for use in the data demodulation of the terminal based on the neighboring cell information, and transmit the interference cancellation information to the terminal.

11. The base station of claim 10 , 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, information on presence or 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 a frequency of data transmission from the neighboring cell to the terminal being served by the neighboring cell.

12. The base station of claim 10 , wherein the specific data channel tones are data channel tones overlapped in position with cell-specific reference signal tones of the neighboring cell.

13. The base station of claim 12 , wherein the interference cancellation information includes 2 bit or 5-bit information indicating positions of the cell-specific reference signal tones of the neighboring cell.

14. 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 to transmit and receive; and
a controller configured to control to receive the interference cancellation information including a specific-data channel tone handling scheme and information on positions of specific-data channel tones, the interference cancellation information being generated based on information on a neighboring cell causing an interference equal to or greater than a predetermined threshold to the terminal for use in data demodulation of the terminal, receive data on data channel tones from the base station, and demodulate the data based on the interference cancellation information,
wherein the specific-data channel tone handling scheme is one of an exclusion of the specific-data channel tones from the data demodulation or an inclusion of the specific-data channel tones with lower weight than other data channel tones to the data demodulation.

15. The terminal of claim 14 , 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, information on presence or 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

Assignees

• Samsung Electronics Co Ltd
• 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

• H04J2011/0009

  with FDM/FDMA · CPC title

• H04W72/042

  Electricity · mapped topic

• H04J11/005 Primary

  of intercell interference · CPC title