METHOD FOR TRANSCEIVING CHANNEL STATE INFORMATION IN WIRELESS ACCESS SYSTEM AND APPARATUS FOR THE METHOD

• US 20150023194A1
• Filed: 01/11/2013
• Published: 01/22/2015
• Est. Priority Date: 01/11/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Hanbyul, Kim, Kijun
• Granted Patent: US 9,774,426 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 1/0029 Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling power control H04W52/04
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• 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: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 48/12 using downlink control channel

Abstract

Disclosed is a method for transceiving channel state information in a wireless access system and an apparatus for the method. More particularly, the method comprises: a step of receiving, from user equipment, channel state information measurement capability indicating the total number of pieces of channel state information which can be measured by the user equipment; a step of transmitting, to the user equipment, information regarding the object for channel state information measurement set in the user equipment; and a step of receiving, from the user equipment, channel state information measured in the object for channel state information measurement. The object for channel state information measurement is restrictively set such that the total number of the objects for channel state information measurement is the same as or less than the channel state information measurement capability.

Claims

1. A method for receiving channel state information (CSI) in a wireless access system, the method comprising:

receiving, from a user equipment, a CSI measurement capability indicating a total number of CSI measurable by the user equipment;

transmitting, to the user equipment, information about a CSI measurement object configured for the user equipment; and

receiving, from the user equipment, CSI measured for the CSI measurement object,

wherein the CSI measurement object is configured such that the total number of the CSI measurement object is restricted to have a number equal to or less than the CSI measurement capability.

2. The method of claim 1, wherein the CSI measurement object comprises a combination of a resource for measuring a signal usable for calculating the CSI and a resource for measuring an interference usable for calculating the CSI.

3. The method of claim 2, wherein the resource for measuring the interference usable for calculating the CSI is classified into a subframe set in which a neighboring base station performs a silencing operation for time domain ICIC (inter-cell interference coordination) and a subframe set in which the neighboring base station does not perform the silencing operation.

4. The method of claim 2, wherein the resource for measuring the signal usable for calculating the CSI is classified according to a reference signal transmission resource of each base station participating in CoMP (coordinated multi-point).

5. The method of claim 2, wherein the resource for measuring the signal usable for calculating the CSI is classified according to a non-zero power CSI-RS resource, and wherein the resource for measuring the interference usable for calculating the CSI is classified according to an interference measurement resource.

6. The method of claim 1, wherein the total number of the CSI measurement object is determined per each component carrier activated in the user equipment.

7. The method of claim 1, wherein the CSI measurement object comprises measurement of the CSI for joint transmission by a plurality of base stations.

8. The method of claim 1, wherein the restriction on the total number of the CSI measurement object is applied to both a periodic CSI report and an aperiodic CSI report.

9. A method for transmitting CSI (channel state information) in a wireless access system, the method comprising:

transmitting, to a base station, a CSI measurement capability indicating a total number of CSI measurable by a user equipment;

receiving, from the base station, information about a CSI measurement object configured for the user equipment; and

transmitting, to the base station, CSI measured for the CSI measurement object,

wherein the CSI measurement object is configured such that the total number of the CSI measurement object is restricted to have a number equal to or less than the CSI measurement capability.

10. The method of claim 9, wherein the CSI measurement object comprises a combination of a resource for measuring a signal usable for calculating the CSI and a resource for measuring interference usable for calculating the CSI.

11. The method of claim 10, wherein the resource for measuring the interference usable for calculating the CSI is classified into a subframe set in which a neighboring base station performs a silencing operation for time domain ICIC (inter-cell interference coordination) and a subframe set in which the neighboring base station does not perform the silencing operation.

12. The method of claim 10, wherein the resource for measuring the signal usable for calculating the CSI is classified according to a reference signal transmission resource of each base station participating in CoMP (coordinated multi-point).

13. The method of claim 10, wherein the resource for measuring the signal usable for calculating the CSI is classified according to a non-zero power CSI-RS resource, and wherein the resource for measuring the interference usable for calculating the CSI is classified according to an interference measurement resource.

14. The method of claim 9, wherein the total number of the CSI measurement object is determined per each component carrier activated in the user equipment.

15. The method of claim 9, wherein the CSI measurement object comprises measurement of the CSI for joint transmission by a plurality of base stations.

16. The method of claim 9, wherein the restriction on the total number of the CSI measurement object is applied to both a periodic CSI report and an aperiodic CSI report.

17. A base station receiving CSI (channel state information) in a wireless access system, the base station comprising:

an RF (radio frequency) unit configured to transceive a radio signal; and

a processor configured to receive, from a user equipment, a CSI measurement capability indicating a total number of CSI measurable by a user equipment, transmit, to the user equipment, information about a CSI measurement object configured for the user equipment, and receive, from the user equipment, CSI measured for the CSI measurement object,

wherein the CSI measurement object is configured such that the total number of the CSI measurement object is restricted to have a number equal to or less than the CSI measurement capability.

18. A user equipment transmitting CSI (channel state information) in a wireless access system, the user equipment comprising:

an RF (radio frequency) unit configured to transceive a radio signal; and

a processor configured to transmit, to a base station, a CSI measurement capability indicating a total number of CSI measurable by a user equipment, receive, from the base station, information about a CSI measurement object configured for the user equipment, and transmit CSI measured for the CSI measurement object,

wherein the CSI measurement object is configured such that the total number of the CSI measurement object is restricted to have a number equal to or less than the CSI measurement capability.