Method and apparatus for transmitting and receiving channel state information

• US 9,912,391 B2
• Filed: 08/12/2016
• Issued: 03/06/2018
• Est. Priority Date: 06/17/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Yu, Hyoungyoul, Kim, Younsun, Lee, Hyojin
• Primary Examiner(s): MEW, KEVIN D
• Application Number:
  US15/236,249
• Publication Number:
  US 20160352401A1
• Time in Patent Office: 571 Days
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0469 taking special antenna structures, e.g. cross polarized antennas into account
• CPC Class Codes: H04B 7/0478 Special codebook structures directed to feedback optimisation
• CPC Class Codes: H04B 7/0486 taking channel rank into account
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• 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 7/0639 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: H04B 7/10 Polarisation diversity; Directional diversity
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

A communication method of a user equipment in a mobile communication system. The method includes receiving a control signal from a base station, the control signal comprising at least one of: a first information element or a second information element; determining, if a field of the first information element is set to a predetermined value and a channel state information (CSI) reporting mode determined based on the second information element is a redetermined mode, a codebook based on the CSI reporting mode; generating a CSI based on the determined codebook, the CSI comprising at least one of a rank indicator (RI), a first precoding matrix indicator (PMI), or a second PMI; and reporting the generated CSI to the base station.

Claims

1. A communication method of a terminal in a communication system, the method comprising:

receiving, from a base station, first information indicating whether at least one predetermined codebook is being used for deriving channel state information (CSI) reporting;

identifying a codebook for CSI reporting based on the first information and a CSI reporting mode; and

transmitting, to the base station, second information on CSI based on the identified codebook.

2. The method of claim 1, wherein the second information comprises a first codebook index and a second codebook index, if the CSI reporting mode corresponds to mode 1-1 submode 2,

wherein the first codebook index is identified based on at least one of a rank indicator and a value of a first precoding matrix indicator (PMI), and

wherein the second codebook index is identified based on the rank indicator and a value of a second precoding matrix indicator (PMI).

3. The method of claim 1, wherein the second information comprises a codebook index, if the CSI reporting mode corresponds to mode 1-1 submode 1,

wherein the codebook index identified based on a rank indicator and a value of joint encoding of the rank indicator and a first precoding matrix indicator.

4. The method of claim 1, wherein the first information is set to predetermined value if a number of a port associated with a reference signal related to the terminal is 4, and

wherein the CSI reporting mode is identified based on third information received from the base station on a higher layer signal.

5. The method of claim 2, wherein the first codebook index and the second codebook index are identified based on values shown in the following table:

6. A communication method of a base station in a communication system, the method comprising:

transmitting, to a terminal, first information indicating whether at least one predetermined codebook is being used for deriving channel state information (CSI) reporting;

identifying a codebook for CSI reporting based on the first information and a CSI reporting mode; and

receiving, from the terminal, second information on CSI based on the identified codebook.

7. The method of claim 6, wherein the second information comprises a first codebook index and a second codebook index, if the CSI reporting mode corresponds to mode 1-1 submode 2,

wherein the first codebook index is identified based on at least one of a rank indicator and a value of a first precoding matrix indicator (PMI), and

wherein the second codebook index is identified based on the rank indicator and a value of a second precoding matrix indicator (PMI).

8. The method of claim 6, wherein the second information comprises a codebook index, if the CSI reporting mode corresponds to mode 1-1 submode 1,

wherein the codebook index identified based on a rank indicator and a value of joint encoding of the rank indicator and a first precoding matrix indicator (PMI).

9. The method of claim 6, wherein the first information is set to predetermined value if a number of a port associated with a reference signal related to the terminal is 4, and

wherein the CSI reporting mode is identified based on third information received from the base station on a higher layer signal.

10. The method of claim 7, wherein the first codebook index and the second codebook index are identified based on values shown in the following table:

11. A terminal in a communication system, the terminal comprising:

a transceiver configured to transmit and receive a signal; and

a controller coupled to the transceiver and configured to;

receive, from a base station, first information indicating whether at least one predetermined codebook is being used for deriving channel state information (CSI) reporting,

identify a codebook for CSI reporting based on the first information and a CSI reporting mode, and

transmit, to the base station, second information on CSI based on the identified codebook.

12. The terminal of claim 11, wherein the second information comprises a first codebook index and a second codebook index, if the CSI reporting mode corresponds to mode 1-1 submode 2,

wherein the first codebook index is identified based on at least one of a rank indicator and a value of a first precoding matrix indicator (PMI), and

wherein the second codebook index is identified based on the rank indicator and a value of a second precoding matrix indicator (PMI).

13. The terminal of claim 11, wherein the second information comprises a codebook index, if the CSI reporting mode corresponds to mode 1-1 submode 1,

wherein the codebook index identified based on a rank indicator and a value of joint encoding of the rank indicator and a first precoding matrix indicator (PMI).

14. The terminal of claim 11, wherein the first information is set to predetermined value if a number of a port associated with a reference signal related to the terminal is 4, and

wherein the CSI reporting mode is identified based on third information received from the base station on a higher layer signal.

15. The terminal of claim 12, wherein the first codebook index and the second codebook index are identified based on values shown in the following table:

16. A base station in a communication system, the base station comprising:

a transceiver configured to transmit and receive a signal; and

a controller coupled to the transceiver and configured to;

transmit, to a terminal, first information indicating whether at least one predetermined codebook is being used for deriving channel state information (CSI) reporting,

identify a codebook for CSI reporting based on the first information and a CSI reporting mode, and

receive, from the terminal, second information on CSI based on the identified codebook.

17. The base station of claim 16, wherein the second information comprises a first codebook index and a second codebook index, if the CSI reporting mode corresponds to mode 1-1 submode 2,

wherein the first codebook index is identified based on at least one of a rank indicator and a value of a first precoding matrix indicator (PMI), and

wherein the second codebook index is identified based on the rank indicator and a value of a second precoding matrix indicator (PMI).

18. The base station of claim 16, wherein the second information comprises a codebook index, if the CSI reporting mode corresponds to mode 1-1 submode 1,

wherein the codebook index identified based on a rank indicator and a value of joint encoding of the rank indicator and a first precoding matrix indicator (PMI).

19. The base station of claim 16, wherein the first information is set to predetermined value if a number of a port associated with a reference signal related to the terminal is 4, and

wherein the CSI reporting mode is identified based on third information received from the base station on a higher layer signal.

20. The base station of claim 17, wherein the first codebook index and the second codebook index are identified based on values shown in the following table: