METHOD AND APPARATUS FOR TRANSRECEIVING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM

• US 20160119099A1
• Filed: 07/25/2014
• Published: 04/28/2016
• Est. Priority Date: 07/26/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Hyungtae, PARK, Jonghyun, SEO, Hanbyul
• Granted Patent: US 9,887,818 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• 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 72/0446 Resources in time domain, e.g. slots or frames

Abstract

The present invention relates to a wireless communication system. A method for a terminal reporting channel state information (CSI) in a wireless communication system, according to one embodiment of the present invention, comprises the steps of: receiving, from a second cell, which is a serving cell and neighboring a first cell, resource block allocation information related to downlink data of the second cell; selecting, based on the resource block allocation information, either a first interface measurement resource (IMR) in which interference from the second cell is present or a second IMR in which interference from the second cell is absent; and transmitting, to the first cell, a channel quality indicator (CQI) calculated based on the IMR which has been selected.

Claims

1. A method for reporting a channel state information (CSI) by a user equipment in a wireless communication system, the method comprising:

receiving a resource block assignment information on downlink data of a second cell from the second cell adjacent to a first cell corresponding to a serving cell;

selecting either a first IMR (interference measurement resource) having interference from the second cell or a second IMR without the interference from the second cell based on the resource block assignment information; and

transmitting a CQI (channel quality indicator) calculated based on the selected IMR to the first cell.

2. The method of claim 1, further comprising:

receiving a DCI (downlink control information) including a 1-bit flag,

wherein if the 1-bit flag corresponds to a first value, a remaining payload of the DCI comprises the resource block assignment information, and

wherein if the 1-bit flag corresponds to a second value, the remaining payload of the DCI comprises a scheduling information.

3. The method of claim 1, further comprising:

transmitting an indication information on presence or non-presence of muting of the second cell to the first cell.

4. The method of claim 3,

wherein the indication information is transmitted in a same subframe as the CQI.

5. The method of claim 1,

wherein the resource block assignment information is determined as either a first pattern information to transmit data only in an even-numbered resource block and to perform muting on an odd-numbered resource block or a second pattern information to transmit the data only in the odd-numbered resource block and to perform the muting on the even-numbered resource block.

6. The method of claim 1,

wherein the resource block assignment information is received through EPDCCH (Enhanced Physical Downlink Control Channel).

7. The method of claim 1,

wherein after a second PMI is received from the second cell, the second PMI is transmitted to the first cell through a first PUSCH (Physical Uplink Shared Channel).

8. A user equipment for reporting a CSI (Channel State Information) in a wireless communication system, the user equipment comprising:

a radio frequency (RF) unit; and

a processor,

wherein the processor is configured;

to receive a resource block assignment information on downlink data of a second cell from the second cell adjacent to a first cell corresponding to a serving cell,

to select either a first IMR (Interference Measurement Resource) having an interference from the second cell or a second IMR without the interference from the second cell based on the resource block assignment information, and

to transmit a CQI (Channel Quality Indicator) calculated based on the selected IMR to the first cell.

9. The user equipment of claim 8,

wherein the processor is further configured to receive a DCI (downlink control information) including a 1-bit flag,

wherein if the 1-bit flag corresponds to a first value, a remaining payload of the DCI comprises the resource block assignment information, and

wherein if the 1-bit flag corresponds to a second value, the remaining payload of the DCI comprises a scheduling information.

10. The user equipment of claim 8,

wherein the processor is further configured to transmit an indication information on presence or non-presence of muting of the second cell to the first cell.

11. The user equipment of claim 10,

wherein the indication information is transmitted in a same subframe as the CQI.

12. The user equipment of claim 8,

wherein the resource block assignment information is determined as either a first pattern information to transmit data only in an even-numbered resource block and to perform muting on an odd-numbered resource block or a second pattern information to transmit the data only in the odd-numbered resource block and to perform the muting on the even-numbered resource block.

13. The user equipment of claim 8,

wherein the resource block assignment information is received through EPDCCH (Enhanced Physical Downlink Control Channel).

14. The user equipment of claim 8,

wherein after a second PMI is received from the second cell, the second PMI is transmitted to the first cell through a first PUSCH (Physical Uplink Shared Channel).