FEEDBACK METHOD OF HYBRID CSI IN MULTI-ANTENNA COMMUNICATION SYSTEM AND DEVICE THEREFOR

• US 20200136683A1
• Filed: 12/23/2019
• Published: 04/30/2020
• Est. Priority Date: 07/05/2016
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Hyungtae, PARK, Jonghyun, PARK, Haewook, HWANG, Daesung
• Granted Patent: US 10,700,745 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0643 Feedback on request
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI

Abstract

Disclosed in the present invention is a method by which a terminal reports channel status information (CSI) to a base station in a wireless communication system. The method comprises the steps of: receiving, through an upper layer, information on one CSI process having a first enhanced multiple input multiple output (eMIMO) type and a second eMIMO type; receiving a first channel status information-reference signal (CSI-RS) corresponding to the first eMIMO type; periodically reporting, to the base station, first CSI measured on the basis of the first CSI-RS; receiving a second CSI-RS, which corresponds to the second eMIMO type, beamformed on the basis of the first CSI; and periodically reporting, to the base station, second CSI measured on the basis of the second CSI-RS, wherein a priority of the first CSI is set to be equal to a priority of a CSI-RS resource indicator (CRI).

Claims

1. A method of transmitting channel status information (CSI) periodically to a base station by a user equipment (UE) in a wireless communication system, the method comprising:

receiving configuration related to one CSI process including a first enhanced multiple input multiple output (eMIMO) type and a second eMIMO type through a higher layer;

transmitting, to the base station, first CSI based on a first channel status information-reference signal (CSI-RS) associated with the first eMIMO type; and

transmitting, to the base station, second CSI based on a second beamformed CSI-RS associated with the second eMIMO type,

wherein a priority of the first CSI is equal to a priority of a CSI-RS resource indicator (CRI).

2. The method according to claim 1, wherein the second beamformed CSI-RS is beamformed based on the first CSI by the base station.

3. The method according to claim 1, wherein if the first CSI including a precoding matrix index (PMI) collides with the second CSI including a rank indicator (RI), the second CSI is dropped.

4. The method according to claim 1, wherein a reporting period of the first CSI is determined to be a multiple of a longest reporting period of the second CSI.

5. The method according to claim 4, wherein:

when the second CSI includes a rank indicator (RI), the longest reporting period of the second CSI is a reporting period of the RI included in the second CSI, and

when the second CSI does not include the RI, the longest reporting period of the second CSI is a reporting period of a channel quality indicator (CQI) included in the second CSI.

6. A user equipment (UE) in a wireless communication system, the UE comprising:

a memory; and

at least one processor coupled to the memory and configured to;

receive configuration related to one channel status information (CSI) process including a first enhanced multiple input multiple output (eMIMO) type and a second eMIMO type through a higher layer;

transmit, to a base station, first CSI periodically based on a first channel status information-reference signal (CSI-RS) associated with the first eMIMO type; and

transmit, to the base station, second CSI periodically based on a second beamformed CSI-RS associated with the second eMIMO type,

wherein a priority of the first CSI is equal to a priority of a CSI-RS resource indicator (CRI).

7. The UE according to claim 6, wherein the second beamformed CSI-RS is beamformed based on the first CSI by the base station.

8. The UE according to claim 6, wherein if the first CSI including a precoding matrix index (PMI) collides with the second CSI including a rank indicator (RI), the second CSI is dropped.

9. The UE according to claim 6, wherein a reporting period of the first CSI is determined to be a multiple of a longest reporting period of the second CSI.

10. The UE according to claim 9, wherein:

when the second CSI includes the RI a rank indicator (RI), the longest reporting period of the second CSI is a reporting period of the RI included in the second CSI, and

when the second CSI does not include the RI, the longest reporting period of the second CSI is a reporting period of a channel quality indicator (CQI) included in the second CSI.