Method for updating hybrid CSI in multiple antenna communication system and device therefor

• US 10,644,764 B2
• Filed: 07/05/2017
• Issued: 05/05/2020
• 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
• Primary Examiner(s): Patel, Dhaval V
• Application Number:
  US16/315,620
• Publication Number:
  US 20190229780A1
• Time in Patent Office: 1,035 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 is a method for a terminal reporting channel status information (CSI) to a base station in a wireless communication system. The method comprises receiving, via an upper later, information associated with a single CSI process comprising a first enhanced multiple input multiple output (eMIMO) type and a second eMIMO type; reporting, to a base station, a first CSI updated on the basis of a first channel status information-reference signal (CSI-RS) corresponding to the first eMIMO type received from a first subframe; and receiving, from the base station, a triggering message of a second CSI calculated on the basis of a second CSI-RS corresponding to the second eMIMO type from a second subframe.

Claims

1. A method of reporting channel status information (CSI) to a base station by a terminal in a wireless communication system, the method comprising:

receiving, through a higher layer, information about one CSI process including a first enhanced multiple input multiple output (eMIMO) type and a second eMIMO type;

reporting first CSI updated on the basis of first channel status information-reference signal (CSI-RS) corresponding to the first eMIMO type, the first CSI-RS being received in a first subframe; and

receiving a triggering message for second CSI in a second subframe from the base station, the second CSI being calculated on the basis of a second CSI-RS corresponding to the second eMIMO type,

wherein when the second subframe is after a predetermined number of subframes previous to the first subframe, or before the predetermined subframes next to the first subframe, the second CSI is not updated.

2. The method according to claim 1, further comprising reporting the second CSI to the base station,

wherein when the second subframe is before a predetermined number of subframes previous to the first subframe, or after the predetermined subframes next to the first subframe, the second CSI is updated on the basis of the second CSI-RS.

3. The method according to claim 1, wherein the second CSI-RS is received in the second subframe.

4. The method according to claim 1, wherein the information about the one CSI process includes information indicating whether the second CSI is in a wideband reporting mode or a subband reporting mode, and information indicating whether the second CSI includes a precoding matrix.

5. The method according to claim 4, wherein the first CSI is in the wideband reporting mode, and includes a precoding matrix.

6. A terminal in a wireless communication system, the terminal comprising:

a wireless communication module; and

a processor connected to the wireless communication module, and configured to receive, through a higher layer, information about one channel status information (CSI) process including a first enhanced multiple input multiple output (eMIMO) type and a second eMIMO type, to report first CSI updated on the basis of first channel status information-reference signal (CSI-RS) corresponding to the first eMIMO type, the first CSI-RS being received in a first subframe, and to receive a triggering message for second CSI in a second subframe from the base station, the second CSI being calculated on the basis of a second CSI-RS corresponding to the second eMIMO type, and

wherein when the second subframe is after a predetermined number of subframes previous to the first subframe, or before the predetermined subframes next to the first subframe, the processor is configured not to update the second CSI.

7. The terminal according to claim 6, wherein when the second subframe is before a predetermined number of subframes previous to the first subframe, or after the predetermined subframes next to the first subframe, the processor is configured to update the second CSI on the basis of the second CSI-RS, and report the updated second CSI.

8. The terminal according to claim 6, wherein the second CSI-RS is received in the second subframe.

9. The terminal according to claim 6, wherein the information about the one CSI process includes information indicating whether the second CSI is in a wideband reporting mode or a subband reporting mode, and information indicating whether the second CSI includes a precoding matrix.

10. The terminal according to claim 9, wherein the first CSI is in the wideband reporting mode, and includes a precoding matrix.