METHOD FOR INTERFERENCE CANCELLATION IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR

• US 20160119936A1
• Filed: 06/17/2014
• Published: 04/28/2016
• Est. Priority Date: 06/19/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Kijun, PARK, Jonghyun, LEE, Hyunho, KIM, Hyungtae
• Granted Patent: US 9,801,192 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04J 11/0053 using co-ordinated multipoint transmission/reception co-ordinated antenna or beam-forming aspects H04B7/022
• CPC Class Codes: H04L 27/261 Details of reference signals
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/30 Resource management for broadcast services
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

Provided herein is a method for interference cancellation for a UE having interference cancellation capability in a wireless communication system, the method comprising: receiving information on a reference signal transmitted from an interfering cell having the possibility of causing inter-cell interference; and attempting to detect the reference signal using the received information on the reference signal, wherein the information on the reference signal is received when the interfering cell and a serving cell of the UE have the same cyclic prefix (CP) length and are synchronized with each other.

Claims

1-10. -10. (canceled)

11. A method for interference cancellation for a UE (user equipment) having interference cancellation capability in a wireless communication system, the method comprising:

receiving information on a neighbor cell for the interference cancellation; and

performing cancellation of interference signal transmitted from the neighbor cell using the received information on the neighbor cell,

wherein the information on the neighbor cell indicates that the neighbor cell has the same cyclic prefix (CP) length as a serving cell of the UE and is subframe-synchronized to the serving cell.

12. The method according to claim 11, wherein the information on the neighbor cell further indicates that the neighbor cell has the same transmission bandwidth as the serving cell.

13. The method according to claim 11, wherein the information on the neighbor cell further comprise:

the number of antenna ports for cell-specific reference signal (CRS) used by the neighbor cell.

14. The method according to claim 11, wherein the information on the neighbor cell further comprise:

MBSFN (multimedia and broadcast single frame network) subframe configuration used by the neighbor cell.

15. The method according to claim 11, wherein the information on the neighbor cell includes an information set about a first reference signal and information sets about one or more second reference signals having a specific relationship with the first reference signal, and each of the information sets about the one or more second reference signals includes information indicating that a second reference signal defined by a corresponding information set has the specific relationship with the first reference signal.

16. The method according to claim 15, wherein the specific relationship corresponds to a relationship in which an antenna port through which the second reference signal is transmitted and an antenna port through which the first reference signal is transmitted are quasi co-located.

17. The method according to claim 15, further comprising:

detecting the first reference signal using the information on the first reference signal;

estimating reception power of the one or more second reference signals using reception power of the detected first reference signal and power correction values included in the information sets about the one or more second reference signals; and

attempting to detect only a second reference signal having estimated reception power higher than a predetermined value.

18. The method according to claim 15, wherein at least one of the information sets about the one or more second reference signals includes information indicating another information set which the at least one of the information sets refers to, the method further comprising if the at least one of the information sets includes the information indicating the another information set, attempting to detect the second reference signal defined by the at least one of the information sets only when a second reference signal defined by the another information set have been successfully detected.

19. The method according to claim 15, wherein the information set about the first reference signal and the information set about the second reference signal further include values indicating transmission possibility of data channels based on the corresponding reference signals.

20. The method according to claim 15, wherein the information set about the first reference signal is an information set about a cell-specific reference signal (CRS), the information set including an ID for identifying the information set, a physical cell ID of the interfering cell, the number of antenna ports for the CRS and an MBSFN (Multicast Broadcast Single Frequency Network) configuration.

21. The method according to claim 15, wherein the each of the information sets about the one or more second reference signals is an information set about a channel state information-reference signal (CSI-RS), the information set including at least one of an ID for identifying the information set, the number of antenna ports for the CSI-RS, configuration of an RE position and subframe in which the CSI-RS is transmitted, a scrambling ID for sequence generation for the CSI-RS, an ID of an information set about a CRS having a specific relationship with the CSI-RS, a type associated with the specific relationship or the transmission power ratio of the CSI-RS to the CRS having the specific relationship with the CSI-RS.

22. The method according to claim 15, wherein the each of the information sets about the one or more second reference signals is an information set about a demodulation-reference signal (DM-RS), the information set including at least one of an ID for identifying the information set, a scrambling ID for sequence generation for the DM-RS, a scrambling identity field value, an antenna port index for the DM-RS, the transmission power ratio of the DM-RS to a CRS or a CSI-RS having a specific relationship with the DM-RS, a type associated with the specific relationship, an ID of an information set about the CRS having the specific relationship with the DM-RS or an ID of an information set about the CSI-RS having the specific relationship with the DM-RS.

23. The method according to claim 11, wherein the performing of cancellation of interference signal comprises:

detecting synchronization signal at a time instance according to the same CP length.

24. A UE (user equipment) having interference cancellation capability in a wireless communication system, comprising:

a radio frequency (RF) unit; and

a processor configured to control the RF unit,

wherein the processor is configured to receive information on a neighbor cell for the interference cancellation, and to perform cancellation of interference signal transmitted from the neighbor cell using the received information on the neighbor cell,

wherein the information on the neighbor cell indicates that the interfering cell has the same cyclic prefix (CP) length as a serving cell of the UE and is subframe-synchronized to the serving cell.