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

• US 9,900,118 B2
• Filed: 04/26/2016
• Issued: 02/20/2018
• 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
• Application Number:
  US15/139,010
• Publication Number:
  US 20160315721A1
• Time in Patent Office: 665 Days
• Field of Search: 455 411
• 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 receiving, by a user equipment, channel state information reference signal (CSI-RS), the method comprising:

receiving, by the user equipment, CSI-RS configuration information;

receiving, by the user equipment, CSI-RSs based on the CSI-RS configuration information; and

measuring, by the user equipment, channel state information (CSI) based on the CSI-RSs,

wherein the CSI-RS configuration information includes CSI-RS pattern information indicating a CSI-RS pattern among a plurality of CSI-RS patterns defined for CSI-RS reception from 8 antenna ports,

wherein each of the plurality of CSI-RS patterns defines 8 resource elements (REs) for the CSI-RS reception per resource block pair, the resource block pair defined by 12 subcarriers in a frequency domain and 14 orthogonal frequency division multiplexing (OFDM) symbols in a time domain,

wherein the 8 REs for the CSI-RS reception are defined by a set of 4 subcarriers among the 12 subcarriers and 2 OFDM symbols among the 14 OFDM symbols, 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.

2. The method according to claim 1, wherein the set of 4 subcarriers consists of 2 sets of 2 consecutive subcarriers.

3. The method according to claim 1, wherein the plurality of CSI-RS patterns 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, and

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

4. The method according to claim 1, wherein the 8 antenna ports are mapped to the 8 REs for the CSI-RS reception in units of 2 antenna ports by using Walsh codes of length 2.

5. The method according to claim 1, wherein the CSI-RS configuration information further includes information indicating at least a CSI-RS reception cycle and a CSI-RS reception start subframe.

6. A method for transmitting, by a base station, channel state information reference signal (CSI-RS), the method comprising:

transmitting, by the base station, CSI-RS configuration information; and

transmitting, by the base station, CSI-RSs based on the CSI-RS configuration information;

wherein the CSI-RS configuration information includes CSI-RS pattern information indicating a CSI-RS pattern among a plurality of CSI-RS patterns defined for CSI-RS transmission through 8 antenna ports,

wherein each of the plurality of CSI-RS patterns defines 8 resource elements (REs) for the CSI-RS transmission per resource block pair, the resource block pair defined by 12 subcarriers in a frequency domain and 14 orthogonal frequency division multiplexing (OFDM) symbols in a time domain,

wherein the 8 REs for the CSI-RS transmission are defined by a set of 4 subcarriers among the 12 subcarriers and 2 OFDM symbols among the 14 OFDM symbols, 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.

7. The method according to claim 6, wherein the set of 4 subcarriers consists of 2 sets of 2 consecutive subcarriers.

8. The method according to claim 6, wherein the plurality of CSI-RS patterns 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, and

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

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

10. The method according to claim 6, wherein the CSI-RS configuration information further includes information indicating at least a CSI-RS transmission cycle and a CSI-RS transmission start subframe.

11. A user equipment for receiving channel state information reference signal (CSI-RS), the user equipment comprising:

a receiver, and

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

control the receiver to receive CSI-RS configuration information;

control the receiver to receive CSI-RSs based on the CSI-RS configuration information; and

measure channel state information (CSI) based on the CSI-RSs,

wherein the CSI-RS configuration information includes CSI-RS pattern information indicating a CSI-RS pattern among a plurality of CSI-RS patterns defined for CSI-RS reception from 8 antenna ports,

wherein each of the plurality of CSI-RS patterns defines 8 resource elements (REs) for the CSI-RS reception per resource block pair, the resource block pair defined by 12 subcarriers in a frequency domain and 14 orthogonal frequency division multiplexing (OFDM) symbols in a time domain,

wherein the 8 REs for the CSI-RS reception are defined by a set of 4 subcarriers among the 12 subcarriers and 2 OFDM symbols among the 14 OFDM symbols, 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. The user equipment according to claim 11, wherein the set of 4 subcarriers consists of 2 sets of 2 consecutive subcarriers.

13. The user equipment according to claim 11, wherein the plurality of CSI-RS patterns 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, and

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

14. The user equipment according to claim 11, wherein the 8 antenna ports are mapped to the 8 REs for the CSI-RS reception in units of 2 antenna ports by using Walsh codes of length 2.

15. The user equipment according to claim 11, wherein the CSI-RS configuration information further includes information indicating at least a CSI-RS reception cycle and a CSI-RS reception start subframe.

16. A base station for transmitting channel state information reference signal (CSI-RS), the base station comprising:

a transmitter, and

a processor, operatively coupled to the transmitter, configured to;

control the transmitter to transmit CSI-RS configuration information; and

control the transmitter to transmit CSI-RSs based on the CSI-RS configuration information;

wherein the CSI-RS configuration information includes CSI-RS pattern information indicating a CSI-RS pattern among a plurality of CSI-RS patterns defined for CSI-RS transmission through 8 antenna ports,

wherein each of the plurality of CSI-RS patterns defines 8 resource elements (REs) for the CSI-RS transmission per resource block pair, the resource block pair defined by 12 subcarriers in a frequency domain and 14 orthogonal frequency division multiplexing (OFDM) symbols in a time domain,

wherein the 8 REs for the CSI-RS transmission are defined by a set of 4 subcarriers among the 12 subcarriers and 2 OFDM symbols among the 14 OFDM symbols,

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.

17. The base station according to claim 16, wherein the set of 4 subcarriers consists of 2 sets of 2 consecutive subcarriers.

18. The base station according to claim 16, wherein the plurality of CSI-RS patterns 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.

19. The base station according to claim 16, wherein the 8 antenna ports are mapped to the 8 REs for the CSI-RS transmission in units of 2 antenna ports by using Walsh codes of length 2.

20. The base station according to claim 16, wherein the CSI-RS configuration information further includes information indicating at least a CSI-RS transmission cycle and a CSI-RS transmission start subframe.