Method for Feeding Back Channel State Information and an Apparatus

Patent metadata

Field	Value
Publication number	US-2016269089-A1
Application number	US-201615160919-A
Country	US
Kind code	A1
Filing date	May 20, 2016
Priority date	Nov 22, 2013
Publication date	Sep 15, 2016
Grant date	—

Abstract

Embodiments relate to a feedback method channel state information. The method includes acquiring, by user equipment, first channel state information based on a first channel state information measurement resource that is configured by a base station and that corresponds to a first antenna port representing a horizontal dimension. The method also includes acquiring, based on a second channel state information measurement resource, which is configured by the base station, of a second antenna port representing a vertical dimension, second channel state information. The method also includes feeding back channel state information to the base station, which includes: feeding back the first channel state information to the base station according to a first feedback mode, and feeding back the second channel state information to the base station according to a second feedback mode, where the second feedback mode is different from the first feedback mode.

First claim

What is claimed is:

1 . A method for feeding back channel state information (CSI), comprising: acquiring, by user equipment (UE), first CSI based on a first CSI measurement resource configured by a base station, wherein the first CSI measurement resource corresponds to a first antenna port representing a horizontal dimension of an antenna array;
acquiring, by the UE, second CSI based on a second CSI measurement resource configured by the base station, wherein the second CSI measurement resource corresponds to a second antenna port representing a vertical dimension of the antenna array; and feeding back, by the UE, CSI to the base station, wherein feeding back the CSI comprises:
feeding back, by the user equipment, the first CSI to the base station according to a first feedback mode, and feeding back the second CSI to the base station according to a second feedback mode, wherein the second feedback mode is different from the first feedback mode; or
feeding back, by the user equipment, third CSI according to a third feedback mode, wherein the third CSI is obtained by the user equipment based on the first CSI and the second CSI.

2 . The method according to claim 1 , wherein the first CSI comprises a first precoding matrix indicator (PMI), the second CSI comprises a second PMI, and the second feedback mode being different from the first feedback mode comprises:
a frequency domain feedback granularity of the first PMI being less than or equal to a frequency domain feedback granularity of the second PMI.

3 . The method according to claim 1 , wherein the second feedback mode being different from the first feedback mode comprises:
a feedback cycle of the first CSI being less than a feedback cycle of the second CSI.

4 . The method according to claim 1 , wherein:
the first CSI comprises a first type of precoding matrix indicator (PMI1), a second type of precoding matrix indicator (PMI2) and a first rank indicator (RI1), and the second CSI comprises a first type of precoding matrix indicator (PMI3), a second type of precoding matrix indicator (PMI4) and a second rank indicator (RI2); and the user equipment obtains a channel quality indicator (CQI) based on the first CSI and the second CSI; and the CSI that is fed back by the user equipment to the base station comprises:
the first CSI, the second CSI, and the CQI; or
third precoding matrix indicator information, third rank indicator information, and the CQI, wherein the third precoding matrix indicator information is obtained based on at least three of the PMI1, the PMI2, the PMI3, and the PMI4, and the third rank indicator information is obtained based on the RI1 and the RI2.

5 . The method according to claim 4 , wherein the user equipment feeds back the CSI to the base station using a physical uplink control channel (PUCCH), and the feeding back, by the user equipment, the CSI to the base station comprises:
feeding back the CSI in a CSI feedback cycle of the PUCCH, wherein a CSI feedback cycle comprises three feedback timeslots; wherein the RI1 and the RI2 are fed back in a first feedback timeslot; wherein the PMI1, the PMI3, and the CQI are fed back in a second feedback timeslot; and wherein the CQI and the PMI2 are fed back in a third feedback timeslot.

6 . The method according to claim 4 , wherein the user equipment feeds back the CSI to the base station using a physical uplink control channel (PUCCH), and the feeding back, by the user equipment, the CSI to the base station comprises:
feeding back the CSI in a CSI feedback cycle of the PUCCH, wherein a CSI feedback cycle comprises three feedback timeslots; wherein the RI1, the RI2, and the PMI1 are fed back in a first feedback timeslot; wherein the PMI2, the PMI3, and the CQI are fed back in a second feedback timeslot; and wherein the PMI2, the PMI3, and the CQI are fed back in a third feedback timeslot.

7 . The method according to claim 4 , wherein the user equipment feeds back the CSI to the base station using a physical uplink control channel (PUCCH), and the feeding back, by the user equipment, the CSI to the base station comprises:
feeding back the CSI in a CSI feedback cycle of the PUCCH, wherein a CSI feedback cycle comprises three feedback timeslots; wherein the RI1, the RI2, the PMI1, and the PMI3 are fed back in a first feedback timeslot; wherein the PMI2, the PMI4, and the CQI are fed back in a second feedback timeslot; and wherein the PMI2, the PMI4, and the CQI are fed back in a third feedback timeslot.

8 . The method according to claim 4 , wherein the user equipment feeds back the CSI to the base station using a physical uplink control channel (PUCCH), and the feeding back, by the user equipment, the CSI to the base station comprises:
feeding back the CSI in a CSI feedback cycle of the PUCCH, wherein the CSI feedback cycle comprises three feedback timeslots; wherein the RI1 and the RI2 are fed back in a first feedback timeslot; wherein the PMI1, the PMI2, the PMI3, and the CQI are fed back in a second feedback timeslot; and wherein the PMI1, the PMI2, the PMI3, and the CQI are fed back in a third feedback timeslot.

9 . The method according to claim 4 , wherein the CSI further comprises a precoding matrix type indicator (PTI) indicating a type of a precoding matrix, and in response to the precoding matrix being of a first type, feeding back the CSI to the base station comprises:
feeding back the CSI in a CSI feedback cycle of a physical uplink control channel (PUCCH), wherein the CSI feedback cycle comprises six feedback timeslots, and content fed back in the timeslots is shown as options in the following table:

First
Second
Third
Fourth
Fifth
Sixth

feedback
feedback
feedback
feedback
feedback
feedback

timeslot
timeslot
timeslot
timeslot
timeslot
timeslot

Option 1
RI1 + RI2
PMI1 + PMI2
PMI3wb + CQIwb
PMI3wb +
PMI3wb +
RI1 + RI2

PTI = 0

CQIwb
CQIwb
PTI = 0

Option 2
RI1 + RI2
PMI1
PMI2 +
PMI2 +
PMI2 +
RI1 + RI2

PTI = 0

PMI3wb + CQIwb
PMI3wb +
PMI3wb +
PTI = 0

CQIwb
CQIwb

Assignees

• Huawei Tech Co Ltd

Inventors

• Liu Jianqin
• Liu Jianghua

Classifications

• H04L1/0675

  characterised by the signaling · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04B7/065

  Variable contents, e.g. long-term or short-short · CPC title

• H04B7/0417

  Feedback systems · CPC title

• H04L1/0026 Primary

  Transmission of channel quality indication · CPC title