METHOD AND DEVICE FOR MEASURING INTERFERENCE IN WIRELESS COMMUNICATION SYSTEM

• US 20150103683A1
• Filed: 04/12/2013
• Published: 04/16/2015
• Est. Priority Date: 04/12/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Eunsun, Seo, Hanbyul, Kim, Byounghoon, Kim, Kijun
• Granted Patent: US 9,414,242 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04J 11/0053 using co-ordinated multipoint transmission/reception co-ordinated antenna or beam-forming aspects H04B7/022
• CPC Class Codes: H04J 11/0059 Out-of-cell user aspects
• CPC Class Codes: H04J 2211/001 using small cells within macro cells, e.g. femto, pico or microcells
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

An embodiment of the present invention relates to a method for measuring interference by a terminal in a wireless communication system and includes: receiving neighboring cell specific reference signal (CRS) information; performing CRS interference cancellation on the basis of the CRS information; and measuring interference by applying a correction value to the result of the CRS interference cancellation, wherein the correction value is set for each sub-frame set for limited measurement.

Claims

1. A method of measuring interference by a User Equipment (UE) in a wireless communication system, the method comprising:

receiving Cell Specific Reference Signal (CRS) information of a neighbor cell;

performing CRS interference cancellation based on the CRS information; and

applying a correction value to a result obtained by performing the CRS interference cancellation to measure interference,

wherein the correction value is set for each subframe set for restricted measurement.

2. The method according to claim 1, wherein the correction value is a ratio of Physical Downlink Shared Channel (PDSCH) Energy per Resource Element (EPRE) to CRS EPRE.

3. The method according to claim 1, wherein a subframe set for the restricted measurement comprises a first subframe set for Almost Blank Subframe (ABS) and a second subframe set for a normal subframe, and

wherein the correction value comprises a first correction value for the first subframe set and a second correction value for the second subframe set.

4. The method according to claim 3, wherein the first correction value is 0 and the second correction value is 1.

5. The method according to claim 3, wherein the UE assumes that the second correction value is equal to the ratio of PDSCH EPRE to CRS EPRE of a serving cell of the UE.

6. The method according to claim 1, wherein the correction value is contained in the CRS information and transmitted to the UE.

7. The method according to claim 1, wherein the CRS information comprises an ABS configuration flag indicating whether or not a specific cell is a collaborative cell of a serving cell of the UE.

8. The method according to claim 7, wherein the ASB configuration flag indicates ASB configuration is shared by the specific cell and the serving cell of the UE when the ABS configuration flag is 1, and the ASB configuration flag indicates that the specific cell is not related to ABS configuration of the serving cell of the UE when the ABS configuration flag is 0.

9. The method according to claim 7, wherein correction values for each subframe are identical, when the ABS configuration flag is 0.

10. The method according to claim 1, wherein a correction value for a subframe set related to ABS is 0 and a correction value for a subframe set related to a normal frame is 1, when the ABS configuration flag is 1.

11. The method according to claim 1, wherein the CRS information includes at least one of a cell identity (ID), the number of CRS ports, information of a frequency for transmission of CRS, and information of time for transmission of CRS.

12. The method according to claim 1, wherein the CRS information is transferred as higher layer signaling.

13. A User Equipment (UE) in a wireless communication system, the UE comprising:

a reception module; and

a processor,

wherein the processor receives Cell Specific Reference Signal (CRS) information of a neighbor cell, performs CRS interference cancellation based on the CRS information, and applies a correction value to a result obtained by performing the CRS interference cancellation to measure interference, and

wherein the correction value is set for each subframe set for restricted measurement.