METHOD AND APPARATUS FOR TRANSMITTING CHANNEL STATE INFORMATION

• US 20130094392A1
• Filed: 06/20/2011
• Published: 04/18/2013
• Est. Priority Date: 06/21/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Min Gyu, Yang, Suck Chel, Ahn, Joon Kui, Seo, Dong Youn
• Granted Patent: US 9,826,425 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0028 Formatting
• CPC Class Codes: H04L 27/2646 using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports

Abstract

The present invention relates to a method for transmitting channel state information of a terminal in a multi-carrier system, and to a terminal using the method. The method comprises the steps of: receiving reference signals from a base station via a plurality of downlink component carriers; measuring a channel state for each of the plurality of downlink component carriers using the reference signals included in the plurality of downlink component carriers; generating channel state information on a portion of the plurality of downlink component carriers; and transmitting to the base station the channel state information on a portion of the plurality of downlink component carriers and/or an index which indicates the portion of the plurality of downlink component carriers.

Claims

1. A method of transmitting channel status information of user equipment in a multi-carrier system, the method comprising:

receiving a reference signal through a plurality of downlink component carriers from a base station;

measuring a channel status on each of the plurality of downlink component carriers using the reference signal included in each of the plurality of downlink component carriers;

generating channel status information on some of the plurality of downlink component carriers; and

transmitting to the base station at least one of channel status information on the some downlink component carriers and an index indicating the some downlink component carriers.

2. The method of claim 1, wherein the some downlink component carriers include one downlink component carrier having a best channel status among the plurality of downlink component carriers.

3. The method of claim 2, wherein the channel status information on the one downlink component carrier and the index indicating the one downlink component carrier are transmitted through one uplink component carrier.

4. The method of claim 2, wherein each of the channel status information on the one downlink component carrier and the index indicating the one downlink component carrier is independently transmitted in a different subframe.

5. The method of claim 1, wherein the channel status information includes at least one a channel quality indicator (CQI), a precoding matrix index (PMI), and a rank indicator (RI).

6. The method of claim 1, further comprising:

receiving an uplink grant from the base station, wherein the uplink grant includes a carrier indication index.

7. The method of claim 6, wherein in a case where a value of the carrier indication index indicates a downlink component carrier configured in the user equipment, the some downlink component carrier include the downlink component carrier indicated by the value of the carrier indication index.

8. The method of claim 6, wherein when the value of the carrier indication index is one of reserved values, the some downlink component carriers include one downlink component carrier having the best channel status among the plurality of downlink component carriers, and wherein the reserved values are values of carrier indication indexes indicating downlink component carriers other than the downlink component carrier configured in the user equipment.

9. The method of claim 8, wherein channel status information on the downlink component carrier having the best channel status is transmitted through only one configured uplink component carrier.

10. A user equipment comprising:

a RF (Radio Frequency) unit that transmits and receives a wireless signal; and

a processor connected to the RF unit, wherein the processor receives a reference signal through a plurality of downlink component carriers from a base station, measures a channel status on each of the plurality of downlink component carriers using the reference signal included in each of the plurality of downlink component carriers, generates channel status information on some of the plurality of downlink component carriers, and transmits to the base station at least one of channel status information on the some downlink component carriers and an index indicating the some downlink component carriers.

11. The user equipment of claim 10, wherein the some downlink component carriers include one downlink component carrier having a best channel status among the plurality of downlink component carriers.

12. The user equipment of claim 10, wherein each of the channel status information on the one downlink component carrier and the index indicating the one downlink component carrier is independently transmitted in a different subframe.

13. The user equipment of claim 10, wherein the processor receives an uplink grant from the base station, and wherein the uplink grant includes a carrier indication index.

14. The user equipment of claim 13, wherein when a value of the carrier indication index indicates a downlink component carrier configured in the user equipment, the some downlink component carriers include a downlink component carrier indicated by the carrier indication index.

15. The user equipment of claim 13, wherein when the value of the carrier indication index is one of reserved values, the some downlink component carriers include one downlink component carrier having the best channel status among the plurality of downlink component carriers, and wherein the reserved values are values of carrier indication indexes indicating downlink component carriers other than the downlink component carrier configured in the user equipment.