Information feedback method, terminal, base station, communication system and storage medium

• US 10,187,129 B2
• Filed: 08/01/2014
• Issued: 01/22/2019
• Est. Priority Date: 05/07/2014
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Zhao, Jing, Chen, Yijian, Lu, Zhaohua, Xiao, Huahua
• Primary Examiner(s): Rutkowski, Jeffrey M
• Assistant Examiner(s): Wood, Jonathan
• Application Number:
  US15/309,353
• Publication Number:
  US 20170085304A1
• Time in Patent Office: 1,635 Days
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0469 taking special antenna structures, e.g. cross polarized antennas into account
• CPC Class Codes: H04B 7/0473 taking constraints in layer or codeword to antenna mapping into account
• CPC Class Codes: H04B 7/0482 Adaptive codebooks
• CPC Class Codes: H04B 7/0486 taking channel rank into account
• 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 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

Disclosed are a channel state feedback information determination method, a terminal, a base station and a communication system. The method includes that: a channel state is measured to form a measurement result; when a Rank Indicator (RI) is 2, a precoding matrix is formed according to the measurement result and a precoding codebook matrix model W; and channel state feedback information is formed according to the precoding matrix. The disclosure further discloses a computer storage medium.

Claims

1. A method for determining channel state feedback information, comprising:

measuring, by a terminal, a channel state to form a measurement result;

when a Rank Indicator (RI) is 2, forming, by the terminal, a precoding matrix according to the measurement result and the following precoding codebook matrix model W;

2. The method according to claim 1, wherein forming the channel state feedback information according to the precoding matrix comprises:

forming channel state feedback information comprising a codebook index according to the precoding matrix and a mapping relationship between precoding matrices and codebook indices.

3. The method according to claim 2, wherein

the codebook indices comprise:

a first index i1, a second index i2 and a third index i3.

4. The method according to claim 3, wherein

the codebook indices further comprise:

a fourth index i4 and/or a fifth index i5.

5. The method according to claim 4, wherein

the vectors v₀, v₁ and v₃ have a common candidate vector set A2;

and

i1 is configured to at least indicate the set A2.

6. The method according to claim 5, wherein

i2 is further configured to at least indicate specific vectors of v₀ and v₁ or specific vectors of v₀, v₁, v₂ and v₃ in the vector set A2.

7. The method according to claim 5, wherein i3 is further configured to at least indicate specific vectors of v₂ and v₃ in the vector set A2.

8. The method according to claim 5, wherein

i2 is further configured to at least indicate a candidate vector set B1 of v₀ and v₁ in the candidate vector set A2;

i3 is further configured to at least indicate a candidate vector set B2 of v₂ and v₃ in the candidate vector set A2,

i4 is further configured to at least indicate specific vectors of v₀ and v₁ in the vector set B1; and

i5 is further configured to at least indicate specific vectors of v₂ and v₃ in the vector set B2.

9. The method according to claim 5, wherein

i2 is further configured to at least indicate the specific vector of v₀ in the vector set A2;

i3 is further configured to at least indicate the specific vector of v₁ in the vector set A2;

i4 is further configured to at least indicate the specific vector of v₂ in the vector set A2; and

i5 is further configured to at least indicate the specific vector of v₃ in the vector set A2.

10. The method according to claim 5, wherein the vector v₀=v₁, or v₂=v₃ or v₀=v₁=v₂=v₃.

11. The method according to claim 3, wherein

the vectors v₀ and v₁ have a common candidate vector set A1;

i1 is configured to at least indicate the set A1; and

i2 is configured to at least indicate specific vectors of v₀ and v₁ in the vector set A1.

12. The method according to claim 11, wherein

i1 is further configured to at least indicate at least part of information of at least one of α

₁, α

₂ and β

.

13. The method according to claim 3, wherein the vectors v₂ and v₃ have a common candidate vector set A3;

and

i2 or i3 is configured to at least indicate the candidate vector set A3.

14. The method according to claim 13, wherein

i4 is configured to at least indicate specific vectors of v₂ and v₃ in the vector set A3.

15. The method according to claim 13, wherein

i2 or i3 is further configured to at least indicate at least part of information of at least one of α

₁, α

₂ and β

.

16. The method according to claim 3, wherein

the vector v₂=R_OT1×

v₀, and i3 is further configured to at least indicate matrix R_OT1;

or,

the vector v₃=R_OT2×

v₁, and i3 is further configured to at least indicate matrix R_OT2;

or,

the vector

17. The method according to claim 3, wherein i1 is a broadband feedback.

18. The method according to claim 1, wherein α

₁ or α

₂ is obtained according to at least one of the vectors v₀, v₁, v₂ and v₃.

19. A terminal, comprising:

a measurement unit, configured to measure a channel state to form a measurement result;

a first determination unit, configured to, when a Rank Indicator (RI) is 2, form a precoding matrix according to the measurement result and the following precoding codebook matrix model W;

20. A non-transitory computer storage medium having computer-executable instructions stored therein, the computer-executable instructions being configured to execute a method for determining channel state feedback information, wherein the method comprises:

measuring, by a terminal, a channel state to form a measurement result;

when a Rank Indicator (RI) is 2, forming, by the terminal, a precoding matrix according to the measurement result and the following precoding codebook matrix model W;