CONFIGURATION OF INTERFERENCE MEASUREMENT RESOURCES FOR ENHANCED DOWNLINK MEASUREMENTS AND MU-MIMO

• US 20140126402A1
• Filed: 10/30/2013
• Published: 05/08/2014
• Est. Priority Date: 11/02/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Nam, Young-Han, Sayana, Krishna, Ng, Boon Loong, Kim, Younsun, Xin, Yan
• Granted Patent: US 9,301,175 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic

Abstract

Apparatuses and methods for indicating and performing interference measurements. A method for performing interference measurements includes identifying a CSI-IM configuration for the UE to perform interference measurement. The method includes determining whether the CSI-IM configuration includes a subset of a total number of frequency resources configured for CSI-IM in the wireless communication system. The method includes measuring interference based on the identified CSI-IM configuration. Additionally, the method includes sending feedback based on the measured interference. The method for performing interference measurements may also include determining whether to perform interference measurements based on all downlink subframes or only a portion of the downlink subframes. Additionally, the method may include performing interference measurement based on the subframe determination.

Claims

1. A method for performing interference measurements by a user equipment (UE) in a wireless communication system, the method comprising:

identifying a channel state information (CSI) interference measurement (IM) configuration for the UE to perform interference measurement;

determining whether or not the CSI-IM configuration includes a subset of a total number of frequency resources configured for CSI-IM in the wireless communication system;

measuring interference based on the identified CSI-IM configuration; and

sending feedback based on the measured interference.

2. The method of claim 1, wherein the subset of a total number of frequency resources configured for CSI-IM corresponds to at least one subband of downlink system bandwidth, the method further comprising:

determining whether to perform subband based interference measurements based on a signal received from a base station.

3. The method of claim 1, wherein whether the UE is to use the subset of frequency resources or the total number of frequency resources to perform interference measurement is included as part of a CSI process definition.

4. The method of claim 1, wherein the CSI-IM configuration is a first CSI-IM configuration for the UE to perform interference measurement based on the total number of frequency resources configured for CSI-IM and the feedback is a first CSI feedback, the method further comprising:

identifying a second CSI-IM configuration for the UE to perform interference measurement based on the subset of frequency resources configured for CSI-IM;

performing a second measurement of interference based on the subset of frequency resources configured for CSI-IM; and

sending a second CSI feedback based on the second measurement of interference.

5. The method of claim 1 further comprising:

determining whether to perform interference measurements based on all downlink subframes or only a portion of the downlink subframes to form a subframe determination; and

performing interference measurement based on the subframe determination,

wherein whether to perform interference measurements based on all downlink subframes or only a portion of the downlink subframes is included in a CSI process definition.

6. An apparatus of a user equipment (UE) capable of performing interference measurements in a wireless communication system, the apparatus comprising:

a controller configured to identify a channel state information (CSI) interference measurement (IM) configuration for the UE to perform interference measurement, determine whether or not the CSI-IM configuration includes a subset of a total number of frequency resources configured for CSI-IM in the wireless communication system, and measure interference based on the identified CSI-IM configuration; and

a transmitter configured to send feedback based on the measured interference.

7. The apparatus of claim 6, wherein the subset of a total number of frequency resources configured for CSI-IM corresponds to at least one subband of downlink system bandwidth, and wherein the controller is configured to determine whether to perform subband based interference measurements based on a signal received from a base station.

8. The apparatus of claim 6, wherein whether the UE is to use the subset of frequency resources or the total number of frequency resources to perform interference measurement is included as part of a CSI process definition.

9. The apparatus of claim 6, wherein:

the CSI-IM configuration is a first CSI-IM configuration for the UE to perform interference measurement based on the total number of frequency resources configured for CSI-IM and the feedback is a first CSI feedback;

the controller is configured to identify a second CSI-IM configuration for the UE to perform interference measurement based on the subset of frequency resources configured for CSI-IM and perform a second measurement of interference based on the subset of frequency resources configured for CSI-IM; and

the transmitter is configured to send a second CSI feedback based on the second measurement of interference.

10. The apparatus of claim 6, wherein the controller is configured to determine whether to perform interference measurements based on all downlink subframes or only a portion of the downlink subframes to form a subframe determination, and perform interference measurement based on the subframe determination, wherein whether to perform interference measurements based on all downlink subframes or only a portion of the downlink subframes is included in a CSI process definition.

11. A method for signaling interference measurements to be made by a user equipment (UE) in a wireless communication system, the method comprising:

sending a signal indicating a channel state information (CSI) interference measurement (IM) configuration for the UE to perform interference measurement, wherein the CSI-IM configuration includes an indication of whether the UE is to use a subset of a total number of frequency resources configured for CSI-IM in the wireless communication system; and

receiving feedback based on measured interference associated with the CSI-IM configuration.

12. The method of claim 11, wherein the subset of a total number of frequency resources configured for CSI-IM corresponds to at least one subband of downlink system bandwidth.

13. The method of claim 11, wherein whether the UE is to use the subset of frequency resources or the total number of frequency resources to perform interference measurement is included as part of a CSI process definition.

14. The method of claim 11, wherein the CSI-IM configuration is a first CSI-IM configuration for the UE to perform interference measurement based on the total number of frequency resources configured for CSI-IM and the feedback is a first CSI feedback, the method further comprising:

indicating a second CSI-IM configuration for the UE to perform interference measurement based on the subset of frequency resources configured for CSI-IM; and

receiving second CSI feedback based measured interference associated with the second CSI-IM configuration.

15. The method of claim 11 further comprising:

indicating whether to perform interference measurements based on all downlink subframes or only a portion of the downlink subframes; and

receiving feedback based on interference measurement associated with the subframe indication,

wherein whether to perform interference measurements based on all downlink subframes or only a portion of the downlink subframes is included in a CSI process definition.

16. An apparatus for signaling interference measurements to be made by a user equipment (UE) in a wireless communication system, the apparatus comprising:

a transmitter configured to send a signal indicating a channel state information (CSI) interference measurement (IM) configuration for the UE to perform interference measurement, wherein the CSI-IM configuration includes an indication of whether the UE is to use a subset of a total number of frequency resources configured for CSI-IM in the wireless communication system; and

a receiver configured to receive feedback based on measured interference associated with the CSI-IM configuration.

17. The apparatus of claim 16, wherein the subset of a total number of frequency resources configured for CSI-IM corresponds to at least one subband of downlink system bandwidth.

18. The apparatus of claim 16, wherein whether the UE is to use the subset of frequency resources or the total number of frequency resources to perform interference measurement is included as part of a CSI process definition.

19. The apparatus of claim 16, wherein:

the CSI-IM configuration is a first CSI-IM configuration for the UE to perform interference measurement based on the total number of frequency resources configured for CSI-IM and the feedback is a first CSI feedback;

the transmitter is configured to indicate a second CSI-IM configuration for the UE to perform interference measurement based on the subset of frequency resources configured for CSI-IM; and

the receiver is configured to receive second CSI feedback based measured interference associated with the second CSI-IM configuration.

20. The apparatus of claim 16, wherein:

the transmitter is configured to indicate whether to perform interference measurements based on all downlink subframes or only a portion of the downlink subframes; and

the receiver is configured to receive feedback based on interference measurement associated with the subframe indication,

wherein whether to perform interference measurements based on all downlink subframes or only a portion of the downlink subframes is included in a CSI process definition.