Method and apparatus for channel status information feedback in mobile communication system

• US 10,230,441 B2
• Filed: 02/09/2017
• Issued: 03/12/2019
• Est. Priority Date: 02/12/2016
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Kwak, Youngwoo, Oh, Jinyoung, Noh, Hoondong, Bae, Taehan, Yeo, Jeongho
• Primary Examiner(s): Mui, Gary
• Application Number:
  US15/428,703
• Publication Number:
  US 20170237478A1
• Time in Patent Office: 761 Days
• CPC Class Codes: H04B 7/0478 Special codebook structures directed to feedback optimisation
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• 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 7/065 Variable contents, e.g. long-term or short-short
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated

Abstract

A communication method and a system for converging a 5th-generation (5G) communication system for supporting higher data rates beyond a 4th-generation (4G) system with a technology for internet of things (IoT) are provided. The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method and an apparatus for transmitting cell status information (CSI) in a mobile communication system are provided. The method includes receiving configuration information for a plurality of channel status information reference signals (CSI-RSs), generating feedback information by measuring at least one of the CSI-RSs based on priority information, and transmitting the feedback information. The priority information is associated with a non-precoded CSI-RS, a cell-specific beamformed CSI-RS and a user equipment (UE)-specific beamformed CSI-RS.

Claims

1. A method of transmitting cell status information (CSI) by a user equipment (UE) in a mobile communication system, the method comprising:

receiving configuration information for a plurality of channel status information reference signals (CSI-RSs);

generating feedback information by measuring at least one of the CSI-RSs based on priority information; and

transmitting the feedback information,

wherein the priority information is associated with a non-precoded CSI-RS, a cell-specific beamformed CSI-RS and a UE-specific beamformed CSI-RS, and

wherein the configuration information includes resource configuration information and feedback configuration information for at least one of the non-precoded CSI-RS, the cell-specific beamformed CSI-RS and the UE-specific beamformed CSI-RS.

2. The method of claim 1, wherein the generating of the feedback information comprises:

identifying whether at least two of a first resource for first feedback information on the non-precoded CSI-RS, a second resource for second feedback information on the cell-specific beamformed CSI-RS, and a third resource for third feedback information on the UE-specific beamformed CSI-RS overlap based on the feedback configuration information.

3. The method of claim 2, wherein the UE gives priority to the feedback information based on a CSI reporting type and drops the feedback information having a lower priority.

4. The method of claim 2, wherein feedback information for the non-precoded CSI-RS and the cell-specific beamformed CSI-RS having higher priority is generated and feedback information for the UE-specific beamformed CSI-RS having lower priority is not generated.

5. The method of claim 1, wherein the non-precoded CSI-RS and the cell-specific beamformed CSI-RS have higher priority than the UE-specific beamformed CSI-RS based on the priority information.

6. The method of claim 1, wherein the feedback information comprises at least one of a rank indicator (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI) and a CSI-RS resource index (CRI).

7. The method of claim 1, wherein the priority information is further associated with at least one of a cell identifier (ID) and a CSI process ID.

8. The method of claim 1, further comprising:

receiving the priority information by a radio resource control (RRC) signaling.

9. At least one non-transitory computer readable storage medium for storing a computer program of instructions configured to be readable by at least one processor for instructing the at least one processor to execute a computer process for performing functions of method of claim 1.

10. A user equipment (UE) for transmitting cell status information (CSI) in a mobile communication system, the UE comprising:

a transceiver configured to transmit and receive signals; and

at least one processor configured to;

receive configuration information for a plurality of channel status information reference signals (CSI-RSs),

generate feedback information by measuring at least one of the CSI-RSs based on priority information, and

transmit the feedback information,

wherein the priority information is associated with a non-precoded CSI-RS, a cell-specific beamformed CSI-RS and a UE-specific beamformed CSI-RS, and

wherein the configuration information includes resource configuration information and feedback configuration information for at least one of the non-precoded CSI-RS, the cell-specific beamformed CSI-RS and the UE-specific beamformed CSI-RS.

11. The UE of claim 10, wherein the at least one processor is further configured to:

identify whether at least two of a first resource for first feedback information on the non-precoded CSI-RS, a second resource for second feedback information on the cell-specific beamformed CSI-RS and a third resource for third feedback information on the UE-specific beamformed CSI-RS overlap based on the feedback configuration information.

12. The UE of claim 11, wherein the UE gives priority to the feedback information based on a CSI reporting type and drops the feedback information having a lower priority.

13. The UE of claim 11, wherein feedback information for the non-precoded CSI-RS and the cell-specific beamformed CSI-RS having higher priority is generated and feedback information for the UE-specific beamformed CSI-RS having lower priority is not generated.

14. The UE of claim 10, wherein the non-precoded CSI-RS and the cell-specific beamformed CSI-RS have higher priority than the UE-specific beamformed CSI-RS based on the priority information.

15. The UE of claim 10, wherein the feedback information comprises at least one of a rank indicator (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI) and a CSI-RS resource index (CRI).

16. The UE of claim 10, wherein the priority information is further associated with at least one of a cell identifier (ID) and a CSI process ID.

17. The UE of claim 10, wherein the at least one processor is further configured to:

receive the priority information by a radio resource control (RRC) signaling.