METHOD FOR CANCELING INTERFERENCE IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR

• US 20160021565A1
• Filed: 09/04/2013
• Published: 01/21/2016
• Est. Priority Date: 03/27/2013
• Status: Active Application

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Eunsun, PARK, Jonghyun, SEO, Hanbyul, KIM, Kijun, KIM, Hyungtae
• Granted Patent: US 10,257,744 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04J 11/004 using regenerative subtractive interference cancellation
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 72/1263 Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows

Abstract

According to an embodiment of the present invention, disclosed is a method for supporting, by a serving base station, cancellation of interference signals from signals received at a target terminal in a wireless communication system. The method comprises the steps of: receiving scheduling information of at least one neighboring base station from the at least one neighboring base station; configuring a set of auxiliary information for canceling the interference signals of a target terminal on the basis of the scheduling information of the at least one neighboring base station; and transmitting the set of auxiliary information for canceling the interference signals of the target terminal to the target terminal, wherein the auxiliary information comprises at least one of demodulation reference signal (DM-RS) related information and cell-specific reference signal (CRS) related information in association with interference signals from respective neighboring base stations.

Claims

1-16. -16. (canceled)

17. A method for supporting, by a serving cell, cancellation of an interfering signal in a received signal of a target terminal in a wireless communication system, the method comprising:

receiving, from a neighboring cell, scheduling information of the neighboring base station;

configuring a set of assistance information for cancellation of an interfering signal of the target terminal based on the scheduling information of the at least one neighboring base station; and

transmitting, to the target terminal, the set of assistance information for cancellation of the interfering signal of the target terminal,

wherein the set of assistance information comprises information about at least one of a cell identifier of the neighboring cell, the number of antenna ports to be used for transmission of cell-specific reference signal (CRS), MBSFN (multimedia broadcast single subframe network) subframe pattern, a ratio of a transmission power of physical downlink shared channel (PDSCH) to a transmission power of the CRS or transmission mode related to the interfering signal.

18. The method according to claim 17, wherein the set of assistance information comprises at least one of precoding matrix information used in transmitting the interfering signal, rank information, information about an index of physical downlink shared channel (PDSCH) starting symbol of the interfering signal and modulation order or MCS level information of the interfering signal.

19. The method according to claim 17, wherein the set of assistance information comprises physical downlink shared channel (PDSCH) resource element (RE) mapping information of the interfering signal.

20. The method according to claim 17, wherein the set of assistance information comprises an almost blank subframe (ABS) pattern of the neighboring base station.

21. The method according to claim 20, wherein, when the assistance information comprises the ABS pattern of the neighboring base station, the set of assistance information is valid only for an ABS indicated by the ABS pattern.

22. The method according to claim 17, wherein the neighboring cell uses resource allocation for a UE and a single precoding in a predetermined number of resource blocks.

23. The method according to claim 17, wherein the serving cell and the neighboring cell have the same system bandwidth.

24. A method for canceling, by a terminal, an interfering signal in a received signal in a wireless communication system, the method comprising:

receiving, from a serving cell, a set of assistance information for cancellation of an interfering signal from a neighboring cell; and

estimating the interfering signal based on the at least one indicated assistance information and canceling the interfering signal in the received signal based on the set of assistance information,

wherein the set of assistance information comprises information about at least one of a cell identifier of the neighboring cell, the number of antenna ports to be used for transmission of cell-specific reference signal (CRS), MBSFN (multimedia broadcast single subframe network) subframe pattern, a ratio of a transmission power of physical downlink shared channel (PDSCH) to a transmission power of the CRS or transmission mode related to the interfering signal.

25. The method according to claim 24, wherein the set of assistance information comprises at least one of precoding matrix information used in transmitting the interfering signal, rank information, information about an index of physical downlink shared channel (PDSCH) starting symbol of the interfering signal and modulation order or MCS level information of the interfering signal.

26. The method according to claim 24, wherein the set of assistance information comprises physical downlink shared channel (PDSCH) resource element (RE) mapping information of the interfering signal.

27. The method according to claim 24, wherein the set of assistance information comprises an almost blank subframe (ABS) pattern of the neighboring base station.

28. The method according to claim 27, wherein, when the assistance information comprises the ABS pattern of the neighboring base station, the set of assistance information is valid only for an ABS indicated by the ABS pattern.

29. The method according to claim 24, wherein the neighboring cell uses resource allocation for a UE and a single precoding in a predetermined number of resource blocks.

30. The method according to claim 24, wherein the serving cell and the neighboring cell have the same system bandwidth.

31. A terminal configured to cancel an interfering signal in a received signal in a wireless communication system, the terminal comprising:

a radio frequency (RF) unit; and

a processor configured to control the RF unit,

wherein the processor is configured to;

receive, from a serving cell, a set of assistance information for cancellation of an interfering signal from a neighboring cell and cancel the interfering signal in the received signal based on the set of assistance information,

wherein the set of assistance information comprises information about at least one of a cell identifier of the neighboring cell, the number of antenna ports to be used for transmission of cell-specific reference signal (CRS), MBSFN (multimedia broadcast single subframe network) subframe pattern, a ratio of a transmission power of physical downlink shared channel (PDSCH) to a transmission power of the CRS or transmission mode related to the interfering signal.