TERMINAL FOR PERIODICALLY TRANSMITTING CSI FEEDBACK INFORMATION

• US 20170047978A1
• Filed: 08/12/2016
• Published: 02/16/2017
• Est. Priority Date: 08/13/2015
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: KIM, Cheulsoon, MOON, Sung-Hyun, PARK, Gi Yoon, SHIN, Wooram
• Granted Patent: US 10,110,290 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0478 Special codebook structures directed to feedback optimisation
• 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 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0636 Feedback format
• 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: H04L 5/0057 Physical resource allocation for CQI

Abstract

Disclosed herein is a terminal including: receiving a CSI-RS from a base station, generating CSI feedback information including indicators such as RI, PTI, and BI and a first PMI and a second PMI that are elements of a double codebook, on the basis of the CSI-RS and transmits the CSI feedback information to the base station through an uplink subframe corresponding to predetermined feedback periodicity.

Claims

1. A terminal, comprising:

a processor, a memory, and a radio frequency unit,

wherein the processor executes a program stored in the memory to perform;

receiving a channel state information-reference signal (CSI-RS) from a base station;

generating CSI feedback information including rank indication (RI), a beam index (BI), at least one wideband channel quality indicator (WB CQI), a WB first precoding matrix indicator (PMI), and a WB second PMI, on the basis of the CSI-RS;

transmitting the RI and the BI in an uplink subframe corresponding to periodicity of a first feedback subframe; and

transmitting the at least one WB CQI, the WB first PMI and the WB second PMI in an uplink subframe corresponding to periodicity of a second feedback subframe.

2. The terminal of claim 1, wherein:

the BI is the CSI feedback information used to transmit indication information of a beam transmitting the CSI-RS or indication information of the CSI-RS to the base station.

3. The terminal of claim 1, wherein:

when the processor performs transmitting the RI and the BI in the uplink subframe corresponding to the periodicity of the first feedback subframe,

the processor performs separately encoding the BI from the RI.

4. The terminal of claim 1, wherein:

when the processor performs transmitting the RI and the BI in the uplink subframe corresponding to the periodicity of the first feedback subframe,

the processor performs jointly encoding the BI and the RI.

5. The terminal of claim 1, wherein:

when the processor performs transmitting the RI and the BI in an uplink subframe corresponding to the periodicity of the first feedback subframe,

the processor performs concatenating the BI to the RI and encoding the BI and the RI using a (20, k) block code.

6. The terminal of claim 1, wherein:

the at least one WB CQI includes a WB spatial differential CQI of 3 bits representing a difference between two WB CQIs.

7. The terminal of claim 1, wherein:

the WB first PMI and the WB second PMI are elements of a double codebook and the PMI of the double codebook is represented by a matrix multiplication or a Kronecker product of the WB first PMI and the WB second PMI, or represented by a pair of index that indicates the WB first PMI and the WB second PMI.

8. A terminal, comprising:

a processor, a memory, and a radio frequency unit,

wherein the processor executes a program stored in the memory to perform;

receiving a channel state information-reference signal (CSI-RS) from a base station;

generating CSI feedback information including rank indication (RI), a beam index (BI), at least one wideband channel quality indicator (WB CQI), a WB first precoding matrix indicator (PMI), and a WB second PMI, on the basis of the CSI-RS;

transmitting the RI, the WB first PMI, and the BI in an uplink subframe corresponding to periodicity of a first feedback subframe; and

transmitting the at least one WB CQI and the WB second PMI in an uplink subframe corresponding to periodicity of a second feedback subframe.

9. The terminal of claim 8, wherein:

the BI is the CSI feedback information used to transmit indication information of a beam transmitting the CSI-RS or indication information of the CSI-RS to the base station.

10. The terminal of claim 8, wherein:

when the processor performs transmitting the RI, the WB first PMI, and the BI in the uplink subframe corresponding to the periodicity of the first feedback subframe,

the processor performs jointly encoding the RI, the WB first PMI, and the BI.

11. The terminal of claim 8, wherein:

the at least one WB CQI includes a WB spatial differential CQI of 3 bits representing a difference between two WB CQIs.

12. The terminal of claim 8, wherein:

the WB first PMI and the WB second PMI are elements of a double codebook and the PMI of the double codebook is represented by a matrix multiplication or a Kronecker product of the WB first PMI and the WB second PMI, or represented by a pair of index that indicates the WB first PMI and the WB second PMI.

13. A terminal, comprising:

a processor, a memory, and a radio frequency unit,

wherein the processor executes a program stored in the memory to perform;

receiving a channel state information-reference signal (CSI-RS) from a base station;

generating CSI feedback information including rank indication (RI), a beam index (BI), a precoding type indicator (PTI), at least one wideband channel quality indicator (WB CQI), a WB first precoding matrix indicator (PMI), and a WB second PMI, on the basis of the CSI-RS;

transmitting the RI, the PTI, and the BI in an uplink subframe corresponding to periodicity of a first feedback subframe; and

when the PTI represents a first value,

transmitting the WB first PMI in an uplink subframe corresponding to periodicity of a second feedback subframe; and

transmitting the at least one WB CQI and the WB second PMI in an uplink subframe corresponding to periodicity of a third feedback subframe.

14. The terminal of claim 13, wherein:

the processor executes the program to further perform;

generating CSI feedback information including at least one subband channel quality indicator (SB CQI), an SB second PMI, and an SB index, on the basis of the CSI-RS, and

when the PTI represents a second value,

transmitting the at least one WB CQI and the WB second PMI in the uplink subframe corresponding to the periodicity of the second feedback subframe; and

transmitting the at least one SB CQI, the SB second PMI, and the SB index in the uplink subframe corresponding to the periodicity of the third feedback subframe.

15. The terminal of claim 13, wherein:

the BI is the CSI feedback information used to transmit indication information of a beam transmitting the CSI-RS or indication information of a CSI-RS to the base station.

16. The terminal of claim 13, wherein:

when the processor performs transmitting the RI, the PTI, and the BI in the uplink subframe corresponding to the periodicity of the first feedback subframe,

the processor performs jointly encoding the RI, the PTI, and the BI.

17. The terminal of claim 13, wherein:

when the processor performs transmitting the RI, the PTI, and the BI in the uplink subframe corresponding to the periodicity of the first feedback subframe,

the processor performs jointly encoding the BI and the RI, and concatenating a bit representing the PTI to the BI and the RI.

18. The terminal of claim 13, wherein:

when the processor performs transmitting the RI, the PTI, and the BI in the uplink subframe corresponding to the periodicity of the first feedback subframe,

the processor performs jointly encoding the RI and the PTI, and concatenating a bit representing the BI to the RI and the PTI.

19. The terminal of claim 13, wherein:

the at least one WB CQI includes a WB spatial differential CQI of 3 bits representing a difference between two WB CQIs.

20. The terminal of claim 13, wherein:

the at least one SB CQI includes a SB spatial differential CQI of 3 bits representing a difference between two SB CQIs.