METHOD FOR TRANSMITTING CHANNEL STATE INFORMATION IN WIRELESS ACCESS SYSTEM

• US 20130021980A1
• Filed: 04/01/2011
• Published: 01/24/2013
• Est. Priority Date: 04/01/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yang, Suckchel, Kim, Mingyu, Ahn, Joonkui, Seo, Dongyoun
• Granted Patent: US 8,995,373 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

The present invention provides various methods for transmitting channel state information relative to one or more serving cells in a carrier-coupled environment, and devices for supporting the same. As one embodiment of the present invention, a method for reporting channel state information (CSI) in a wireless access system that supports carrier coupling comprises the steps of: allowing a terminal to receive information related to a CSI report mode for one or more serving cells from a base station; and allowing the terminal to report the channel state information (CSI) on the one or more serving cells to the base station by considering the CSI report mode. In this case, if first type CSI for a first serving cell and second type CSI for a second serving cell are transmitted on the same subframe, the terminal can report CSI for one serving cell only, to the base station, according to priorities of CSI report types related to the CSI report mode.

Claims

1. A method for reporting Channel State Information (CSI) in a wireless access system which supports carrier aggregation, the method comprising:

receiving, at a User Equipment (UE), information related to a CSI reporting mode for one or more downlink component carriers (DL CCs) from a Base Station (BS); and

reporting, at the UE, CSI for the one or more D L CCs to the BS in consideration of the CSI reporting mode,

wherein, if first type CSI for a first DL CC and second type CSI for a second DL CC are transmitted in a same subframe, the UE reports only CSI for one DL CC to the BS according to priority of a CSI reporting type related to the CSI reporting mode.

2. The method of claim 1, wherein, if priority of the first type CSI is higher than priority of the second type CSI, the UE transmits only the first type CSI to the BS and drops the second type CSI.

3. The method of claim 2, wherein the first type CSI indicates that the UE reports a Rank Indicator (RI) and a first Precoding Matrix Indicator (PMI) or only the RI to the BS and the second type CSI indicates that the UE reports a Wideband Channel Quality Indicator (WB-CQI) and a second PMI, the WB-CQI and the first PMI, or only the WB-CQI to the BS.

4. The method of claim 2, wherein the first type CSI indicates that the UE reports a WB-CQI and a second PMI, the WB-CQI and a first PMI, or only the WB-CQI to the BS and the second type CSI indicates that the UE reports a Subband CQI (SB-CQI) and the second PMI or only the SB-CQI to the BS.

5. The method of claim 2, wherein the first type CSI indicates that the UE reports an RI and a first PMI or only the RI to the BS and the second type CSI indicates that the UE reports an SB-CQI and a second PMI or only the SB-CQI to the BS.

6. The method of claim 2, wherein reporting the CSI is periodically performed according to each content of the CSI.

7. The method of claim 2, wherein the first type CSI is a CSI reporting type 3 or a CSI reporting type 5 and the second type CSI is a CSI reporting type 2b, a CSI reporting type 2c, a CSI reporting type 4, a CSI reporting type 1, or a CSI reporting type 1a.

8. The method of claim 2, wherein the first type CSI is transmitted to the BS through a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).

9. A User Equipment (UE) for reporting Channel State Information (CSI) in a wireless access system which supports carrier aggregation, the UE comprising:

a transmission module for transmitting a channel signal;

a reception module for receiving a channel signal; and

a processor for supporting CSI reporting,

wherein the UE receives information related to a CSI reporting mode for one or more downlink component carriers (DL CCs) through the reception module from a Base Station (BS) and reports CSI for the one or more DL CCs to the BS in consideration of the CSI reporting mode, and if first type CSI for a first DL CC and second type CSI for a second DL CC are transmitted in a same subframe, the UE reports only CSI for one DL CC to the BS according to priority of a CSI reporting type related to the CSI reporting mode.

10. The UE of claim 9, wherein, if priority of the first type CSI is higher than priority of the second type CSI, the UE transmits only the first type CSI to the BS and drops the second type CSI.

11. The UE of claim 10, wherein the first type CSI indicates that the UE reports a Rank Indicator (RI) and a first Precoding Matrix Indicator (PMI) or only the RI to the BS and the second type CSI indicates that the UE reports a Wideband Channel Quality Indicator (WB-CQI) and a second PMI, the WB-CQI and the first PMI, or only the WB-CQI to the BS.

12. The UE of claim 10, wherein the first type CSI indicates that the UE reports a WB-CQI and a second PMI, the WB-CQI and a first PMI, or only the WB-CQI to the BS and the second type CSI indicates that the UE reports a Subband CQI (SB-CQI) and the second PMI or only the SB-CQI to the BS.

13. The UE of claim 10, wherein the first type CSI indicates that the UE reports an RI and a first PMI or only the RI to the BS and the second type CSI indicates that the UE reports an SB-CQI and a second PMI or only the SB-CQI to the BS.

14. The UE of claim 10, wherein the first type CSI is a CSI reporting type 3 or a CSI reporting type 5 and the second type CSI is a CSI reporting type 2b, a CSI reporting type 2c, a CSI reporting type 4, a CSI reporting type 1, or a CSI reporting type 1a.

15. The UE of claim 10, wherein the first type CSI is transmitted to the BS through a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).