User equipment initiated channel state feedback codebook selection

Patent metadata

Field	Value
Publication number	US-11050465-B2
Application number	US-201916449293-A
Country	US
Kind code	B2
Filing date	Jun 21, 2019
Priority date	Jun 21, 2019
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

Aspects are provided allowing a UE configured for Type II channel state feedback (CSF) to determine based on one or more antenna configurations or channel conditions whether to use the Type II codebook or to revert to a Type I codebook when computing CSF. Based on this determination, the UE may compute CSF based on the Type I codebook in situations where the performance gain of Type II codebooks may be reduced, thereby saving computational power, transmission power, and/or overhead when computing and reporting CSI feedback. The UE may subsequently transmit the CSF computed based on the Type I codebook in the allocated resources for Type II CSI feedback without the need for a separate signaling format, thereby simplifying and enabling reuse of the CSI feedback procedure.

First claim

What is claimed is:

1. A method of wireless communication at a user equipment (UE), comprising:
receiving a configuration from a base station to transmit channel state feedback (CSF) using a first codebook type;
determining whether to transmit the CSF using the first codebook type or a second codebook type, wherein the UE determines to transmit the CSF using the second codebook type based on one or more of an antenna configuration or a channel condition, and
wherein the channel condition comprises a signal-to-noise ratio (SNR) and wherein the UE determines to transmit the CSF using the first codebook type when the SNR is below an SNR threshold and determines to transmit the CSF using the second codebook type when the SNR meets the SNR threshold; and
transmitting the CSF using a selected codebook type based on a determination of whether to transmit the CSF using the first codebook type or the second codebook type.

2. The method of claim 1 , wherein the first codebook type comprises a Type II codebook and the second codebook type comprises a Type I codebook.

3. The method of claim 1 , wherein the antenna configuration comprises a number of antenna ports, and wherein the UE determines to transmit the CSF using the second codebook type when the number of antenna ports is lower than an antenna port threshold and determines to transmit the CSF using the first codebook type when the number of antenna ports meets the antenna port threshold.

4. The method of claim 1 , wherein the antenna configuration comprises an antenna correlation, and wherein the UE determines to transmit the CSF using the first codebook type when the antenna correlation is below a correlation threshold and determines to transmit the CSF using the second codebook type when the antenna correlation exceeds the correlation threshold.

5. The method of claim 1 , wherein the antenna configuration comprises a number of beams configured for the second codebook type, and wherein the UE determines to transmit the CSF using the first codebook type when the number of beams meets a beam threshold and determines to transmit the CSF using the second codebook type when the number of beams is lower than the beam threshold.

6. The method of claim 1 , wherein the channel condition comprises a number of users communicating based on multi-user multiple-input-multiple-output (MU-MIMO), and wherein the UE determines to transmit the CSF using the first codebook type when the number of users is below a user threshold and determines to transmit the CSF using the second codebook type when the number of users meets the user threshold.

7. The method of claim 1 , wherein the channel condition comprises at least one of a statistical channel property or interference from other users, and wherein the UE determines to transmit the CSF using the second codebook type based on the statistical channel property or interference.

8. The method of claim 1 , further comprising:
computing the CSF using the second codebook type based on the determination.

9. The method of claim 1 , further comprising:
transmitting the CSF using the second codebook type within a container in uplink control information (UCI) for the first codebook type.

10. An apparatus for wireless communication, comprising:
means for receiving a configuration from a base station to transmit channel state feedback (CSF) using a first codebook type;
means for determining whether to transmit the CSF using the first codebook type or a second codebook type, wherein the means for determining is configured to determine to transmit the CSF using the second codebook type based on one or more of an antenna configuration or a channel condition, and
wherein the channel condition comprises a signal-to-noise ratio (SNR) and wherein the means for determining is configured to determine to transmit the CSF using the first codebook type when the SNR is below an SNR threshold and to determine to transmit the CSF using the second codebook type when the SNR meets the SNR threshold; and
means for transmitting the CSF using a selected codebook type based on a determination of whether to transmit the CSF using the first codebook type or the second codebook type.

11. The apparatus of claim 10 , further comprising:
means for computing the CSF using the second codebook type based on the determination.

12. The apparatus of claim 10 , further comprising:
means for transmitting the CSF using the second codebook type within a container in uplink control information (UCI) for the first codebook type.

13. An apparatus for wireless communication, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive a configuration from a base station to transmit channel state feedback (CSF) using a first codebook type;
determine whether to transmit the CSF using the first codebook type or a second codebook type, wherein the at least one processor is configured to determine to transmit the CSF using the second codebook type based on one or more of an antenna configuration or a channel condition, and
wherein the channel condition comprises a signal-to-noise ratio (SNR) and wherein the at least one processor is configured to determine to transmit the CSF using the first codebook type when the SNR is below an SNR threshold and to determine to transmit the CSF using the second codebook type when the SNR meets the SNR threshold; and
transmit the CSF using a selected codebook type based on a determination of whether to transmit the CSF using the first codebook type or the second codebook type.

14. The apparatus of claim 13 , wherein the first codebook type comprises a Type II codebook and the second codebook type comprises a Type I codebook.

15. The apparatus of claim 13 , wherein the antenna configuration comprises a number of antenna ports, and wherein the at least one processor is configured to determine to transmit the CSF using the second codebook type when the number of antenna ports is lower than an antenna port threshold and to determine to transmit the CSF using the first codebook type when the number of antenna ports meets the antenna port threshold.

16. The apparatus of claim 13 , wherein the antenna configuration comprises an antenna correlation, and wherein the at least one processor is configured to determine to transmit the CSF using the first codebook type when the antenna correlation is below a correlation threshold and to determine to transmit the CSF using the second codebook type when the antenna correlation exceeds the correlation threshold.

17. The apparatus of claim 13 , wherein the antenna configuration comprises a number of beams configured for the second codebook type, and wherein the at least one processor is configured to determine to transmit the CSF using the first codebook type when the number of beams meets a beam threshold and to determine to transmit the CSF using the second codebook type when the number of beams is lower than the beam threshold.

18. The apparatus of claim 13 , wherein the channel condition comprises a number of users communicating based on multi-user multiple-input-multiple-output (MU-MIMO), and wherein the at least one processor is configured to determine to transmit the CSF using the first codebook type when the number of users is below a user threshold and to determine to transmit the CSF using the second codebook type when the number of users meets the user threshold.

19. The apparatus of claim 13 , wherein the channel condition comprises at least one of a statistical channel property or interfer

Assignees

• Qualcomm Inc

Inventors

• Cheraghi Parisa
• Gorokhov Alexei Yurievitch

Classifications

• H04B17/336

  Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] · CPC title

• 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 Primary

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

• H04B7/0482

  Adaptive codebooks · CPC title

• H04B7/0452

  Multi-user MIMO systems · CPC title