METHOD AND BASE STATION FOR CSI PROCESS CONFIGURATION AND METHOD AND USER EQUIPMENT FOR CSI FEEDBACK

• US 20160173244A1
• Filed: 08/04/2014
• Published: 06/16/2016
• Est. Priority Date: 08/02/2013
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: DING, Ming
• Granted Patent: US 10,044,477 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels

Abstract

The present disclosure provides a method in a base station for Channel State Information (CSI) process configuration and an associated base station. The method comprises: setting CSI process information for a User Equipment (UE) supporting three dimensional (3D) Multiple Input Multiple Output (MIMO), the CSI process information including at least an index of a CSI Reference Signal Resource (CSI-RS-R) for a vertical direction of a 3D MIMO antenna array; and transmitting the set CSI process information to the UE. Also disclosed are a method in a UE for CSI feedback and an associated UE. The method comprises: receiving CSI process information from a base station, the CSI process information including at least an index of a CSI Reference Signal Resource (CSI-RS-R) for a vertical direction of a three dimensional (3D) Multiple Input Multiple Output (MIMO) antenna array; measuring a CSI Reference Signal (CSI-RS) transmitted from the base station over the CSI-RS-R configured by the base station; and feeding CSI information back to the base station based on a measurement result.

Claims

1. A method in a base station for Channel State Information (CSI) process configuration, comprising:

setting CSI process information for a User Equipment (UE) supporting three dimensional (3D) Multiple Input Multiple Output (MIMO), the CSI process information including at least an index of a CSI Reference Signal Resource (CSI-RS-R) for a vertical direction of a 3D MIMO antenna array; and

transmitting the set CSI process information to the UE.

2. The method of claim 1, wherein

one CSI process is configured for a UE supporting 3D MIMO, and

the process information set for the CSI process includes:

an index of a CSI-RS-R for a horizontal direction, an index of a CSI-RS-R for a vertical direction, a ratio of a power density for data transmission to that for transmission of a CSI Reference Signal (CSI-RS) associated with a first row of horizontal antenna array, and a ratio of the power density for data transmission to that for transmission of a CSI-RS associated with a first column of vertical antenna array.

3. The method of claim 2, wherein the index of the CSI-RS-R for the horizontal direction is the same as an index of a CSI-RS-R configured for a UE supporting two dimensional (2D) MIMO.

4. The method of claim 1, wherein

for a UE supporting both 3D MIMO and 2D MIMO, a first CSI process associated with a first row of horizontal antenna array for 2D MIMO and a second assisting CSI process associated with a first column of vertical antenna array for assisting 2D MIMO are configured,

the process information set for the first CSI process includes:

an index of a CSI-RS-R for a horizontal direction and a ratio of a power density for data transmission to that for transmission of a CSI-RS associated with the first row of horizontal antenna array, and

the process information set for the second assisting CSI process includes;

an index of a CSI-RS-R for a vertical direction and a ratio of the power density for data transmission to that for transmission of a CSI-RS associated with the first column of vertical antenna array.

5. The method of claim 1, wherein

for a UE supporting both 3D MIMO and 2D MIMO, a first CSI process associated with a first row of horizontal antenna array for 2D MIMO and a second assisting CSI process associated with a first column of vertical antenna array for assisting 2D MIMO are configured,

the process information set for the first CSI process includes:

an index of a CSI-RS-R for a horizontal direction and a ratio of a power density for data transmission to that for transmission of a CSI-RS associated with the first row of horizontal antenna array, and

the process information set for the second assisting CSI process includes;

an index of a CSI-RS-R for a vertical direction, a ratio of the power density for data transmission to that for transmission of a CSI-RS associated with a first column of horizontal antenna array, and a ratio of the power density for data transmission to that for transmission of a CSI-RS associated with the first column of vertical antenna array.

6. The method of claim 2, wherein time domain subframes associated with the CSI-RS-R for the vertical direction are consistent with time domain subframes associated with the CSI-RS-R for the horizontal direction.

7. The method of claim 2, wherein, for a UE supporting 2D MIMO, the base station has a zero transmission power over the CSI-RS-R corresponding to the index of the CSI-RS-R for the vertical direction.

18. The method of claim 4, wherein time domain subframes associated with the CSI-RS-R for the vertical direction are consistent with time domain subframes associated with the CSI-RS-R for the horizontal direction.

19. The method of claim 5, wherein time domain subframes associated with the CSI-RS-R for the vertical direction are consistent with time domain subframes associated with the CSI-RS-R for the horizontal direction.

20. The method of claim 4, wherein, for a UE supporting 2D MIMO, the base station has a zero transmission power over the CSI-RS-R corresponding to the index of the CSI-RS-R for the vertical direction.

8. A method in a User Equipment (UE) for Channel State Information (CSI) feedback, comprising:

receiving CSI process information from a base station, the CSI process information including at least an index of a CSI Reference Signal Resource (CSI-RS-R) for a vertical direction of a three dimensional (3D) Multiple Input Multiple Output (MIMO) antenna array;

measuring a CSI Reference Signal (CSI-RS) transmitted from the base station over the CSI-RS-R configured by the base station; and

feeding CSI information back to the base station based on a measurement result.

9. The method of claim 8, wherein the CSI information includes the following information for 3D MIMO:

a channel Rank Index (RI), W1 and W2 for a horizontal antenna array, W1 and W2 for a vertical antenna array, a Channel Quality Index (CQI) and frequency sub-band information.

10. The method of claim 8, wherein the CSI information includes CSI information for 2D MIMO and CSI information for assisting 3D MIMO, the CSI information for 2D MIMO including an RI, W1 and W2 for a horizontal antenna array, a CQI and frequency sub-band information, and the CSI information for assisting 3D MIMO including an RI, W1 and W2 for a vertical antenna array, a CQI and frequency sub-band information.

11. The method of claim 10, wherein the RI and/or the frequency sub-band information in the CSI information for 2D MIMO are inherited as the RI and/or the frequency sub-band information in the CSI information for assisting 3D MIMO.

12. The method of claim 10, wherein the CQI in the CSI information for 2D MIMO is not fed back and the CQI in the CSI information for assisting 3D MIMO is replaced with a CQI for 3D MIMO.

13. The method of claim 10, wherein the CQI in the CSI information for assisting 3D MIMO is not fed back and the CQI in the CSI information for 2D MIMO is replaced with a CQI for 3D MIMO.

14. The method of claim 10, wherein the frequency sub-band information in the CSI information for 2D MIMO and the frequency sub-band information in the CSI information for assisting 3D MIMO are selected jointly for feedback.

15. The method of claim 10, wherein the CQI in the CSI information for 2D MIMO and the CQI in the CSI information for assisting 3D MIMO are coded differentially for feedback.

16. A base station, comprising:

a Channel State Information (CSI) process information setting unit configured to set CSI process information for a User Equipment (UE) supporting three dimensional (3D) Multiple Input Multiple Output (MIMO), the CSI process information including at least an index of a CSI Reference Signal Resource (CSI-RS-R) for a vertical direction of a 3D MIMO antenna array; and

a CSI process information transmitting unit configured to transmit the set CSI process information to the UE.

17. A User Equipment (UE), comprising:

a Channel State Information (CSI) process information receiving unit configured to receive CSI process information from a base station, the CSI process information including at least an index of a CSI Reference Signal Resource (CSI-RS-R) for a vertical direction of a three dimensional (3D) Multiple Input Multiple Output (MIMO) antenna array;

a reference signal measuring unit configured to measure a CSI Reference Signal (CSI-RS) transmitted from the base station over the CSI-RS-R configured by the base station; and

a CSI information feedback unit configured to feed CSI information back to the base station based on a measurement result.