METHOD FOR PERFORMING MEASUREMENT THROUGH ELIMINATING INTERFERENCE AND TERMINAL

• US 20150358855A1
• Filed: 11/29/2013
• Published: 12/10/2015
• Est. Priority Date: 01/18/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: YANG, Yoonoh, HWANG, Jinyup, JUNG, Manyoung, LEE, Sangwook, LIM, Suhwan
• Granted Patent: US 9,838,906 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 17/382 for resource allocation, admission control or handover
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• 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: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present invention provides a method for performing a measurement by a terminal in a wireless communications system having both a macro cell and a small cell. The method for performing a measurement includes the step of receiving CRS (Cellspecific Reference Signal) support information from the macro cell or the small cell which works as a serving cell. The CRS support information may contain the information of a cell sending a CRS causing interference. The method may include the step of receiving respectively a CRS from the macro and a CRS from the small cell. Here, a timing offset may be adjusted between the sub-frame receiving the CRS from the macro cell and the sub-frame receiving the CRS from the small cell.

Claims

1. A method for performing measurements by a terminal in a wireless communication system in which a macro cell and a small-scale cell coexist, the method comprising:

receiving Cell-specific Reference Signal (CRS) assistance information from any one cell that corresponds to a serving cell among the macro cell and the small-scale cell, wherein the CRS assistance information includes information on a cell that transmits a CRS that causes interference;

receiving each of the CRS from the macro cell and the CRS from the small-scale cell, wherein a timing offset is adjusted between a subframe in which the CRS is received from the macro cell and a subframe in which the CRS is received from the small-scale cell; and

performing a measurement for the CRS from the serving cell by performing the interference cancellation function for the remaining CRS except the CRS from the serving cell using the CRS assistance information.

2. The method of claim 1, further comprising receiving measurement configuration information from the serving cell,

wherein the measurement configuration information includes information on a subframe in which a measurement of a neighbor cell is to be performed.

3. The method of claim 1, wherein the CRS assistance information is received with being included in radio resource configuration information,

wherein the radio resource configuration information includes information on a subframe in which a measurement of the serving cell is to be performed.

4. The method of claim 1, wherein the CRS assistance information includes information on the CRS that causes interference and information on a cell that transmits the CRS that causes interference.

5. The method of claim 1, wherein the timing offset is identical to or less than 3 us.

6. The method of claim 1, wherein the timing offset is identical to or less than cyclic prefix length/2.

7. A terminal for performing measurements in a wireless communication system in which a macro cell and a small-scale cell coexist, the terminal comprising:

a receiver configured to receive Cell-specific Reference Signal (CRS) assistance information from any one cell that corresponds to a serving cell among the macro cell and the small-scale cell, wherein the receiver receives each of the CRS from the macro cell and the CRS from the small-scale cell,

wherein the CRS assistance information includes information on a cell that transmits a CRS that causes interference, wherein a timing offset is adjusted between a subframe in which the CRS is received from the macro cell and a subframe in which the CRS is received from the small-scale cell; and

a processor configured to perform a measurement for the CRS from the serving cell by performing the interference cancellation function with respect to the remaining CRS except the CRS from the serving cell using the CRS assistance information.

8. The terminal of claim 7, wherein the receiver further receives measurement configuration information from the serving cell,

wherein the measurement configuration information includes information on a subframe in which a measurement of a neighbor cell is to be performed.

9. The terminal of claim 7, wherein the CRS assistance information is received with being included in radio resource configuration information,

wherein the radio resource configuration information includes information on a subframe in which a measurement of the serving cell is to be performed.

10. The terminal of claim 7, wherein the CRS assistance information includes information on the CRS that causes interference and information on a cell that transmits the CRS that causes interference.

11. The terminal of claim 7, wherein the timing offset is identical to or less than 3 us.

12. The terminal of claim 7, wherein the timing offset is identical to or less than cyclic prefix length/2.