Transmit Diversity Method, Terminal, and Base Station

Patent metadata

Field	Value
Publication number	US-2019334591-A1
Application number	US-201916504832-A
Country	US
Kind code	A1
Filing date	Jul 8, 2019
Priority date	Jan 7, 2017
Publication date	Oct 31, 2019
Grant date	—

Abstract

The present disclosure relates to information feedback methods and apparatus. One example method includes receiving signaling from a base station, where the signaling is used to instruct to feed back transmit diversity-based channel state information and sending feedback information to the base station, where the feedback information includes precoding matrix indicator (PMI), the PMI is used to indicate a precoding matrix in a precoding matrix set, and a structure of the precoding matrix is one of two specific structures.

First claim

1 . An information feedback method, comprising:
receiving signaling from a base station, wherein the signaling is used to instruct to feed back transmit diversity-based channel state information; and sending feedback information to the base station, wherein the feedback information comprises precoding matrix indicator (PMI), wherein the PMI is used to indicate a precoding matrix in a precoding matrix set, wherein a structure of the precoding matrix comprises at least one of

[

W
1

0

0

W
2

]

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and
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[

W
1

W
2

ϕ
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W

1

-

ϕ
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W

2

]

,

wherein W 1 and W 2 are different vectors, and wherein φ is a phase factor.

2 . The method according to claim 1 , wherein the PMI comprises a first PMI and a second PMI, wherein the first PMI and the second PMI are used to jointly indicate the precoding matrix in the precoding matrix set, wherein the first PMI is used to indicate a column vector set, and wherein the second PMI is used to indicate a first column vector and a second column vector in the column vector set.

3 . The method according to claim 2 , wherein the first column vector indicates a K th column in the column vector set, wherein the second column vector indicates an L th column in the column vector set, wherein an absolute value of a difference between K and L is greater than or equal to n, wherein K and L are positive integers, and wherein a value of n is greater than or equal to 1.

4 . The method according to claim 1 , further comprising:
receiving M reference signals from the base station through M antenna ports, wherein the M reference signals are respectively associated with precoding vectors, wherein M is an integer greater than or equal to 2, wherein the PMI is used to indicate two antenna ports in the M antenna ports, wherein an interval between port numbers of the two antenna ports is n, and wherein the value of n is greater than or equal to 1.

5 . The method according to claim 3 , wherein the value of n is configured by the base station by using signaling, or n is a predefined value.

6 . A non-transitory computer readable storage medium comprising instructions which, when executed by a computer, cause the computer to perform the method according to claim 1 .

7 . User equipment (UE), comprising a transceiver and at least one processor, wherein:
the transceiver is configured to receive signaling from a base station, wherein the signaling is used to instruct to feed back transmit diversity-based channel state information; the at least one processor is configured to generate feedback information, wherein the feedback information comprises precoding matrix indicator (PMI), wherein the PMI is used to indicate a precoding matrix in a precoding matrix set, wherein a structure of the precoding matrix comprises at least one of

[

W
1

0

0

W
2

]





and


[

W
1

W
2

ϕ

W

1

-

ϕ

W

2

]

,

wherein W 1 and W 2 are different vectors, and wherein φ is a phase factor; and
the transceiver is further configured to send the feedback information to the base station.

8 . The UE according to claim 7 , wherein the PMI comprises a first PMI and a second PMI, wherein the first PMI and the second PMI are used to jointly indicate the precoding matrix in the precoding matrix set, wherein the first PMI is used to indicate a column vector set, and wherein the second PMI is used to indicate a first column vector and a second column vector in the column vector set.

9 . The UE according to claim 8 , wherein the first column vector in

Assignees

• Huawei Tech Co Ltd

Inventors

• Liu Kunpeng
• Li Xueru
• Qu Bingyu

Classifications

• H04B7/0639

  Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection · CPC title

• H04B7/0626

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04B7/0456 Primary

  Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting · CPC title

• H04B7/063 Primary

  Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection · 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