METHOD FOR TERMINAL REPORTING APERIODIC HYBRID CSI IN MULTIPLE ANTENNA COMMUNICATION SYSTEM, AND DEVICE THEREFOR

• US 20190312614A1
• Filed: 07/11/2017
• Published: 10/10/2019
• Est. Priority Date: 07/11/2016
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Hyungtae, PARK, Jonghyun, PARK, Haewook
• Granted Patent: US 10,727,908 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0417 Feedback systems
• 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 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Disclosed is a method for a terminal reporting aperiodic channel status information (CSI) to a base station in a wireless communication system. The method comprises the steps of: receiving, from a base station via downlink control information (DCI), a CSI report triggering message of at least one CSI process, among multiple CSI processes, that is connected with one enhanced multiple input multiple output (eMIMO) type among a first eMIMO type and a second eMIMO type; and updating an aperiodic CSI associated with the at least one CSI process and reporting same to the base station based on a reference signal corresponding to the one eMIMO type.

Claims

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

receiving, from the base station, a CSI report triggering message for at least one of a plurality of CSI processes by downlink control information (DCI), the at least one CSI process being associated with one of a first enhanced multiple input multiple output (eMIMO) type and a second eMIMO type; and

updating aperiodic CSI for the at least one CSI process based on a reference signal corresponding to the one eMIMO type, and reporting the updated aperiodic CSI to the base station.

2. The method according to claim 1, further comprising receiving, through a higher layer, information about the plurality of CSI processes for which a hybrid CSI reporting scheme is defined,

wherein the hybrid CSI reporting scheme includes reporting CSI of the first eMIMO type and reporting CSI of the second eMIMO type.

3. The method according to claim 1, wherein the DCI includes an uplink grant.

4. The method according to claim 1, further comprising reporting, to the base station, first information about a maximum number of reference signal resources per CSI process, supported by the terminal, and second information about the sum of numbers of antenna ports in the reference signal resources per CSI process, supported by the terminal,

wherein first information about the at least one CSI process is the sum of a maximum number of reference signal resources corresponding to the first eMIMO type and a maximum number of reference signal resources corresponding to the second eMIMO type, and

wherein second information about the at least one CSI process is the sum of the number of antenna ports corresponding to the first eMIMO type and the number of antenna ports corresponding to the second eMIMO type.

5. The method according to claim 1, wherein a reference signal corresponding to the second eMIMO type is beamformed based on CSI reported based on a reference signal corresponding to the first eMIMO type.

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

a wireless communication module; and

a processor connected to the wireless communication module,

wherein the processor is configured to receive, from the base station, a CSI report triggering message for at least one of a plurality of CSI processes by downlink control information (DCI), the at least one CSI process being associated with one of a first enhanced multiple input multiple output (eMIMO) type and a second eMIMO type, and to update aperiodic CSI for the at least one CSI process based on a reference signal corresponding to the one eMIMO type, and report the updated aperiodic CSI to the base station.

7. The terminal according to claim 6, wherein the processor is configured to receive, through a higher layer, information about the plurality of CSI processes for which a hybrid CSI reporting scheme is defined, and

wherein the hybrid CSI reporting scheme includes reporting CSI of the first eMIMO type and reporting CSI of the second eMIMO type.

8. The terminal according to claim 6, wherein the DCI includes an uplink grant.

9. The terminal according to claim 6, wherein the processor is configured to report, to the base station, first information about a maximum number of reference signal resources per CSI process, supported by the terminal, and second information about the sum of numbers of antenna ports in the reference signal resources per CSI process, supported by the terminal,

wherein first information about the at least one CSI process is the sum of a maximum number of reference signal resources corresponding to the first eMIMO type and a maximum number of reference signal resources corresponding to the second eMIMO type, and

wherein second information about the at least one CSI process is the sum of the number of antenna ports corresponding to the first eMIMO type and the number of antenna ports corresponding to the second eMIMO type.

10. The terminal according to claim 6, wherein a reference signal corresponding to the second eMIMO type is beamformed based on CSI reported based on a reference signal corresponding to the first eMIMO type.