Method and apparatus for high-resolution CSI reporting in advanced wireless communication systems

Patent metadata

Field	Value
Publication number	US-11637732-B2
Application number	US-201916512242-A
Country	US
Kind code	B2
Filing date	Jul 15, 2019
Priority date	Jul 18, 2018
Publication date	Apr 25, 2023
Grant date	Apr 25, 2023

Abstract

Method and apparatus for high-resolution channel state information (CSI) reporting in advanced wireless communication systems. A method of operating a user equipment (UE) includes selecting, from a full basis set comprising N bases for a plurality of v layers, an intermediate basis set comprising N′ bases that are common among the plurality of v layers and selecting, from the selected intermediate basis set, a basis subset comprising Ml bases for each layer l of the plurality of v layers. The method further includes transmitting, to a base station (BS), indices of the N′ bases included in the selected intermediate basis set and indices of the Ml bases included in the selected basis subsets. N, N′, and Ml are positive integers; N′<N; Ml<N′; l∈{0, 1 . . . , v−1}; and v is a rank value.

First claim

What is claimed is:

1. A user equipment (UE), the UE comprising:
a transceiver; and
a processor configured to:
receive, via the transceiver, configuration information including information for a channel state information (CSI) report, the configuration information indicating a codebook type,
identify an intermediate basis set including N′ basis vectors common to a plurality of layers, based on a full basis set including N basis vectors, and
identify a basis subset including M l basis vectors each specific to a layer l of the plurality of layers, based on the intermediate basis set, and
transmit, via the transceiver, the CSI report including a pre-coding matrix indicator (PMI) regarding the N′ basis vectors included in the intermediate basis set and the M l basis vectors included in the basis subset, to a base station,

wherein N, N′, and M l are positive integers, N′<N, M l <N′, and l is a value corresponding to a number of the one or more layers.

2. The UE of claim 1 , wherein the PMI includes indicators indicating indices of the N′ basis vectors included in the intermediate basis set.

3. The UE of claim 1 , wherein the PMI includes indicators indicating indices of the M l basis vectors included in the basis subset.

4. The UE of claim 1 , wherein a value of the M l basis vectors of the basis subset is determined based on the configuration information received from the BS.

5. The UE of claim 1 , wherein the codebook type is set to type 2 based on the configuration information.

6. The UE of claim 1 , wherein the codebook type corresponds to a total number of precoding matrices indicated by the PMI.

7. The UE of claim 1 , wherein a value of M l for each of the basis subsets is determined based on configuration information received from the BS.

8. A base station (BS), the BS comprising:
a processor; and
a transceiver configured to
transmit, to a user equipment (UE), configuration information including information for a channel state information (CSI) report, the configuration information indicating a codebook type, wherein an intermediate basis set including N′ basis vectors common to a plurality of layers is based on a full basis set including N basis vectors, wherein a basis subset including M l basis vectors each specific to a layer l of the plurality of layers is based on the intermediate basis set, and
receive, from the UE, the CSI report including a pre-coding matric indicator (PMI) regarding the basis vectors included in the intermediate basis set and the M l basis vectors included in the basis subset, from the UE,
wherein N, N′, and M l are positive integers, N′<N, M l <N′, and l is a value corresponding to a number of the one or more layers.

9. The BS of claim 8 , wherein the PMI includes indicators indicating indices of the N′ basis vectors included in the intermediate basis set.

10. The BS of claim 8 , wherein the PMI includes indicators indicating indices of the M l basis vectors included in the basis subset.

11. The BS of claim 8 , wherein a value of the M l basis vectors of the basis subset is determined based on the configuration information received from the BS.

12. The BS of claim 8 , wherein the codebook type is set to type 2 based on the configuration information.

13. The BS of claim 8 , wherein the codebook type corresponds to a total number of precoding matrices indicated by the PMI.

14. The BS of claim 8 , wherein a value of M l for each of the basis subsets is indicated in configuration information transmitted by the transceiver to the UE.

15. A method for operating a user equipment (UE), the method comprising:
receiving configuration information including information for a channel state information (CSI) report, the configuration information indicating a codebook type;
identifying an intermediate basis set including N′ basis vectors common to a plurality of layers, based on a full basis set including N basis vectors;
identifying a basis subset including M l basis vectors each specific to a layer l of the plurality of layers, based on the intermediate basis set; and
transmitting the CSI report including a pre-coding matrix indicator (PMI) regarding the N′ basis vectors included in the intermediate basis set and the M l basis vectors included in the basis subset, to a base station,

wherein N, N′, and M l are positive integers, N′<N, M l <N′, and l is a value corresponding to a number of the one or more layers.

16. The method of claim 15 , wherein the PMI includes indicators indicating the indices of the N′ basis vectors included in the intermediate basis set.

17. The method of claim 15 , wherein the PMI includes indicators indicating indices of the M l basis vectors included in the basis subset.

18. The method of claim 15 , wherein a value of the M l basis vectors of the basis subset is determined based on the configuration information received from the BS.

19. The method of claim 15 , wherein the codebook type is set to type 2 based on the configuration information.

20. The method of claim 15 , wherein the codebook type corresponds to a total number of precoding matrices indicated by the PMI.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Rahman Md Saifur
• Onggosanusi Eko

Classifications

• H04B7/0481

  using subset selection of codebooks · CPC title

• H04B7/06952

  Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping · CPC title

• H04B7/0486

  taking channel rank into account · CPC title

• H04B7/0456

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