Method and apparatus for cancelling interference and receiving signal in wireless communication system

Patent metadata

Field	Value
Publication number	US-2016226538-A1
Application number	US-201414913947-A
Country	US
Kind code	A1
Filing date	Oct 27, 2014
Priority date	Oct 28, 2013
Publication date	Aug 4, 2016
Grant date	—

Abstract

The present invention relates to a wireless communication system. A method for cancelling interference and receiving a signal by a user equipment in a wireless communication system, the method performed by the user equipment comprising: receiving assistance information for cancelling an interference signal transmitted from an interfering base station; cancelling the interference signal based on the assistance information; and receiving a desired signal from a serving base station, wherein the user equipment assumes a part of the assistance information for cancelling the interference signal as a limited value and then receives the interference signal.

First claim

1 . A method for cancelling interference and receiving a signal by a user equipment in a wireless communication system, the method performed by the user equipment comprising:
receiving assistance information for cancelling an interference signal transmitted from an interfering base station; cancelling the interference signal based on the assistance information; and receiving a desired signal from a serving base station, wherein the user equipment assumes a part of the assistance information for cancelling the interference signal as a limited value and then receives the interference signal.

2 . The method of claim 1 , wherein the user equipment assumes that the number of data layers of the interference signal is smaller than or equal to the number of data layers of the desired signal.

3 . The method of claim 1 , wherein the user equipment assumes that the number of data layers of the interference signal is smaller than or equal to a value obtained by subtracting the number of data layers of the desired signal from the number of receiving antennas of the user equipment.

4 . The method of claim 1 , wherein the user equipment assumes that a modulation order of the interference signal is smaller than or equal to a value obtained by subtracting the number of data layers of the desired signal from the number of receiving antennas of the user equipment.

5 . The method of claim 2 , further comprising:
calculating PMI of the interfering base station on the basis of the number of data layers of the assumed interference signal.

6 . The method of claim 1 , further comprising:
receiving whether the user equipment can calculate a starting symbol of an interference PDSCH (Physical Downlink Control Channel) through a PCFCH (Physical Control Format Indicator Channel) of the interfering base station, through RRC (Radio Resource Control) signaling.

7 . The method of claim 1 , further comprising:
receiving information on an interference DM-RS (demodulation reference signal), which may be connected with a CRS (Common Reference Signal) of the interfering base station through QCL (Quasi Co-location) A.

8 . A user equipment configured to cancel interference and receive data in a wireless communication system, the user equipment comprising:
a radio frequency (RF) unit; and a processor, wherein the processor is configured to receive assistance information for cancelling an interference signal transmitted from an interfering base station, cancel the interference signal on the basis of the assistance information, and receive a desired signal from a serving base station, wherein the processor assumes a part of the assistance information for cancelling the interference signal as a limited value, and then the user equipment receives the interference signal.

9 . The user equipment of claim 8 , wherein the processor assumes that the number of data layers of the interference signal is smaller than or equal to the number of data layers of the desired signal.

10 . The user equipment of claim 8 , wherein the processor assumes that the number of data layers of the interference signal is smaller than or equal to a value obtained by subtracting the number of data layers of the desired signal from the number of receiving antennas of the user equipment.

11 . The user equipment of claim 8 , wherein the processor assumes that a modulation order of the interference signal is smaller than or equal to a value obtained by subtracting the number of data layers of the desired signal from the number of receiving antennas of the user equipment.

12 . The user equipment of claim 9 , wherein the processor is further configured to calculate PMI of the interfering base station on the basis of the number of data layers of the assumed interference signal.

13 . The user equipment of claim 8 , wherein the processor is further configured to receive whether a starting symbol of an interference PDSCH (Physical Downlink Control Channel) can be calculated through a PCFCH (Physical Control Format Indicator Channel) of the interfering base station, through RRC (Radio Resource Control) signaling.

14 . The user equipment of claim 8 , wherein the processor is further configured to receive information on an interference DM-RS (demodulation reference signal), which may be connected with a CRS (Common Reference Signal) of the interfering base station through QCL (Quasi Co-location) A.

Assignees

• Lg Electronics Inc

Inventors

• Kim Hyungtae
• Kim Kijun
• Yi Yunjung
• Kim Byounghoon
• Park Hanjun
• Lee Hyunho

Classifications

• H04B1/123 Primary

  using adaptive balancing or compensation means (adaptive filter circuits and algorithms H03H) · CPC title

• H04B1/126 Primary

  having multiple inputs, e.g. auxiliary antenna for receiving interfering signal (aerials in general H01Q) · CPC title