Method and user equipment for measuring interference, and method and base station for receiving interference information

• US 9,350,476 B2
• Filed: 02/22/2011
• Issued: 05/24/2016
• Est. Priority Date: 02/23/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Moon Il, Chung, Jae Hoon, Ko, Hyun Soo, Han, Seung Hee
• Primary Examiner(s): AKINYEMI, AJIBOLA A
• Application Number:
  US13/580,826
• Publication Number:
  US 20120315859A1
• Time in Patent Office: 1,918 Days
• Field of Search: 455/41.1
• 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: H04J 11/005 of intercell interference
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports

Abstract

A method and apparatus for providing information indicating radio resources for multi-cell interference measurement at a BS so that a UE can more accurately measure interference are disclosed.

Claims

1. A method for measuring, by a user equipment, interference in a wireless communication system, the method comprising:

receiving, by the user equipment, interference measurement resource information for a serving cell, the interference measurement resource information indicating radio resources for interference measurement; and

performing the interference measurement using the indicated radio resources,

wherein the indicated radio resources are muted radio resources in which a group of antenna ports associated with the serving cell transmits one or more signals including a channel state information reference signal (CSI-RS) at zero transmission power to the user equipment, and

wherein the indicated radio resources are configured with at least one of a plurality of predefined CSI-RS resource patterns for the CSI-RS transmission.

2. The method according to claim 1, wherein the interference measurement resource information includes subframe information indicating an interference measurement subframe which includes the radio resources for the interference measurement.

3. The method according to claim 2, wherein the subframe information includes information indicating a subframe cycle, at which the radio resources for the interference measurement occurs, and a subframe offset for the radio resources for the interference measurement.

4. The method according to claim 1, wherein the plurality of predefined CSI-RS resource patterns include CSI-RS patterns for 8 antenna ports,

wherein each of the CSI-RS patterns for 8 antenna ports defines 8 resource elements (REs) for the CSI-RS transmission per resource block pair, the resource block pair consisting of 12 subcarriers and 14 orthogonal frequency division multiplexing (OFDM) symbols,

wherein the 8 REs for the CSI-RS transmission in each of the CSI-RS patterns for 8 antenna ports are defined by a set of 4 subcarriers in a frequency domain of the resource block pair and 2 OFDM symbols in a time domain of the resource block pair, and

wherein the 2 OFDM symbols are corresponding to a first OFDM symbol set consisting of OFDM symbols 5 and 6 among OFDM symbols 0 to 6 of an even numbered slot, a second OFDM symbol set consisting of OFDM symbols 2 and 3 among OFDM symbols 0 to 6 of an odd numbered slot, or a third OFDM symbol set consisting of OFDM symbols 5 and 6 among the OFDM symbols 0 to 6 of the odd numbered slot.

5. The method according to claim 4, wherein the set of 4 subcarriers consists of 2 sets of 2 consecutive subcarriers.

6. The method according to claim 4, wherein the 8 antenna ports are mapped to 8 REs of one of the CSI-RS patterns for the 8 antenna ports in units of 2 antenna ports by using Walsh codes of length 2.

7. The method according to claim 4, wherein the CSI-RS patterns for the 8 antenna ports include a first CSI-RS pattern defined by a first set of 4 subcarriers and the first OFDM symbol set, a second CSI-RS pattern defined by the first set of 4 subcarriers and the second OFDM symbol set, a third CSI-RS pattern defined by the first set of 4 subcarriers and the third OFDM symbol set, a fourth CSI-RS pattern defined by a second set of 4 subcarriers and one of the first to third OFDM symbol sets, and a fifth CSI-RS pattern defined by a third set of 4 subcarriers and the one of the first to third OFDM symbol sets,

wherein the first to fifth CSI-RS patterns are orthogonal to each other.

8. A method for receiving, by a base station, channel state information in a wireless communication system, the method comprising:

transmitting, to a user equipment, interference measurement resource information for a serving cell, the interference measurement resource information indicating radio resources for interference measurement; and

receiving, from the user equipment, channel state information generated based on the interference measurement performed by the user equipment using the indicated radio resources,

wherein the indicated radio resources include muted radio resources in which a group of antenna ports associated with the serving cell transmits one or more signals including a channel state information reference signal (CSI-RS) at zero transmission power to the user equipment, and

wherein the indicated radio resources are configured with at least one of a plurality of predefined CSI-RS resource patterns for the CSI-RS transmission.

9. The method according to claim 8, wherein the interference measurement resource information includes subframe information indicating an interference measurement subframe which includes the radio resources for the interference measurement.

10. The method according to claim 9, wherein the subframe information includes information indicating a subframe cycle, at which the radio resources for the interference measurement occurs, and a subframe offset for the radio resources for the interference measurement.

11. The method according to claim 8, wherein the plurality of predefined CSI-RS resource patterns include CSI-RS patterns for 8 antenna ports,

wherein each of the CSI-RS patterns for 8 antenna ports defines 8 resource elements (REs) for the CSI-RS transmission per resource block pair, the resource block pair consisting of 12 subcarriers and 14 orthogonal frequency division multiplexing (OFDM) symbols,

wherein the 8 REs for the CSI-RS transmission in each of the CSI-RS patterns for 8 antenna ports are defined by a set of 4 subcarriers in a frequency domain of the resource block pair and 2 OFDM symbols in a time domain of the resource block pair, and

wherein the 2 OFDM symbols are corresponding to a first OFDM symbol set consisting of OFDM symbols 5 and 6 among OFDM symbols 0 to 6 of an even numbered slot, a second OFDM symbol set consisting of OFDM symbols 2 and 3 among OFDM symbols 0 to 6 of an odd numbered slot, or a third OFDM symbol set consisting of OFDM symbols 5 and 6 among the OFDM symbols 0 to 6 of the odd numbered slot.

12. A user equipment for measuring interference in a wireless communication system, comprising:

a receiver; and

a processor, operatively coupled to the receiver, configured to control the receiver,

wherein the receiver is configured to receive interference measurement resource information for a serving cell, the interference measurement resource information indicating radio resources for interference measurement, and the processor is configured to perform the interference measurement using the indicated radio resources, and

wherein the indicated radio resources include muted radio resources in which a group of antenna ports associated with the serving cell transmits one or more signals including a channel state information reference signal (CSI-RS) at zero transmission power to the user equipment, and

wherein the indicated radio resources are configured with at least one of a plurality of predefined CSI-RS resource patterns for the CSI-RS transmission.

13. The user equipment according to claim 12, wherein the interference measurement resource information includes subframe information indicating an interference measurement subframe which includes the radio resources for the interference measurement.

14. The user equipment according to claim 13, wherein the subframe information includes information indicating a subframe cycle, at which the radio resources for the interference measurement occurs, and a subframe offset for the radio resources for the interference measurement.

15. The user equipment according to claim 12, wherein the plurality of predefined CSI-RS resource patterns include CSI-RS patterns for 8 antenna ports,

wherein each of the CSI-RS patterns for 8 antenna ports defines 8 resource elements (REs) for the CSI-RS transmission per resource block pair, the resource block pair consisting of 12 subcarriers and 14 orthogonal frequency division multiplexing (OFDM) symbols,

wherein the 8 REs for the CSI-RS transmission in each of the CSI-RS patterns for 8 antenna ports are defined by a set of 4 subcarriers in a frequency domain of the resource block pair and 2 OFDM symbols in a time domain of the resource block pair, and

wherein the 2 OFDM symbols are corresponding to a first OFDM symbol set consisting of OFDM symbols 5 and 6 among OFDM symbols 0 to 6 of an even numbered slot, a second OFDM symbol set consisting of OFDM symbols 2 and 3 among OFDM symbols 0 to 6 of an odd numbered slot, or a third OFDM symbol set consisting of OFDM symbols 5 and 6 among the OFDM symbols 0 to 6 of the odd numbered slot.

16. A base station for receiving interference information in a wireless communication system, comprising:

a transmitter;

a receiver; and

a processor, operatively coupled to the transmitter and the receiver, configured to control the transmitter and the receiver,

wherein the processor is configured to control the transmitter to transmit, to a user equipment, interference measurement resource information for a serving cell, the interference measurement resource information indicating radio resources for interference measurement, and control the receiver to receive channel state information generated based on the interference measurement performed by the user equipment using the indicated radio resources, and

wherein the indicated radio resources include muted radio resources in which a group of antenna ports associated with the serving cell transmits one or more signals including a channel state information reference signal (CSI-RS) at zero transmission power to the user equipment, and

wherein the indicated radio resources are configured with at least one of a plurality of predefined CSI-RS resource patterns for the CSI-RS transmission.

17. The base station according to claim 16, wherein the interference measurement resource information includes subframe information indicating an interference measurement subframe which includes the radio resources for the interference measurement.

18. The base station according to claim 17, wherein the subframe information includes information indicating a subframe cycle, at which the radio resources for the interference measurement occurs, and a subframe offset for the radio resources for the interference measurement.

19. The base station according to claim 16, wherein the plurality of predefined CSI-RS resource patterns include CSI-RS patterns for 8 antenna ports,

wherein each of the CSI-RS patterns for 8 antenna ports defines 8 resource elements (REs) for the CSI-RS transmission per resource block pair, the resource block pair consisting of 12 subcarriers and 14 orthogonal frequency division multiplexing (OFDM) symbols,

wherein the 8 REs for the CSI-RS transmission in each of the CSI-RS patterns for 8 antenna ports are defined by a set of 4 subcarriers in a frequency domain of the resource block pair and 2 OFDM symbols in a time domain of the resource block pair, and

wherein the 2 OFDM symbols are corresponding to a first OFDM symbol set consisting of OFDM symbols 5 and 6 among OFDM symbols 0 to 6 of an even numbered slot, a second OFDM symbol set consisting of OFDM symbols 2 and 3 among OFDM symbols 0 to 6 of an odd numbered slot, or a third OFDM symbol set consisting of OFDM symbols 5 and 6 among the OFDM symbols 0 to 6 of the odd numbered slot.