Method and base station for csi process configuration and method and user equipment for csi feedback

Patent metadata

Field	Value
Publication number	US-2016173244-A1
Application number	US-201414907882-A
Country	US
Kind code	A1
Filing date	Aug 4, 2014
Priority date	Aug 2, 2013
Publication date	Jun 16, 2016
Grant date	—

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.

First claim

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.

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.

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

Assignees

• Sharp Kk

Inventors

• Ding Ming

Classifications

• H04W52/325

  Power control of control or pilot channels · CPC title

• H04L5/0023 Primary

  Time-frequency-space · CPC title

• H04L1/16

  in which the return channel carries supervisory signals, e.g. repetition request signals · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04B7/0469 Primary

  taking special antenna structures, e.g. cross polarized antennas into account · CPC title