Frequency domain dimension reduction for channel state feedback

Patent metadata

Field	Value
Publication number	US-11387881-B2
Application number	US-202016824982-A
Country	US
Kind code	B2
Filing date	Mar 20, 2020
Priority date	Mar 20, 2020
Publication date	Jul 12, 2022
Grant date	Jul 12, 2022

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, a channel state information reference signal that includes a plurality of resource blocks. The UE may sub-sample one or more portions of the plurality of resource blocks prior to performing one or more channel state feedback computations. Accordingly, the UE may perform the one or more channel state feedback computations based at least in part on the one or more sub-sampled portions of the plurality of resource blocks and transmit, to the base station, a channel state feedback report based at least in part on the one or more channel state feedback computations that are performed using the one or more sub-sampled portions of the plurality of resource blocks. Numerous other aspects are provided.

First claim

What is claimed is:

1. A method of wireless communication performed by a user equipment (UE), comprising:
receiving, from a base station, a channel state information reference signal that includes a plurality of resource blocks;
sub-sampling one or more portions of the plurality of resource blocks, prior to performing one or more channel state feedback computations, to identify one or more sub-sampled portions of the plurality of resource blocks, wherein the one or more sub-sampled portions comprises fewer resource blocks than the plurality of resource blocks received from the base station;
performing the one or more channel state feedback computations based at least in part on the one or more sub-sampled portions of the plurality of resource blocks; and
transmitting, to the base station, a channel state feedback report based at least in part on the one or more channel state feedback computations that are performed based at least in part on the one or more sub-sampled portions of the plurality of resource blocks.

2. The method of claim 1 , wherein the one or more portions of the plurality of resource blocks are sub-sampled according to a uniform sub-sampling factor.

3. The method of claim 1 , wherein the one or more sub-sampled portions of the plurality of resource blocks include every N th resource block among the plurality of resource blocks, where N is an integer having a value greater than one.

4. The method of claim 1 , wherein the one or more channel state feedback computations include a first channel state feedback computation performed on a first set of resource blocks that includes every M th resource block among the plurality of resource blocks and a second channel state feedback computation performed on a second set of resource blocks that includes every N th resource block among the plurality of resource blocks, where M and N are integers with different values greater than one.

5. The method of claim 1 , wherein the one or more portions of the plurality of resource blocks are sub-sampled according to a non-uniform sub-sampling pattern.

6. The method of claim 1 , wherein the one or more sub-sampled portions of the plurality of resource blocks include a first subset of the plurality of resource blocks that are outside a target frequency region, and wherein the one or more channel state feedback computations are further performed using a second subset of the plurality of resource blocks that includes all resource blocks within the target frequency region.

7. The method of claim 1 , wherein the one or more channel state feedback computations performed using the one or more sub-sampled portions of the plurality of resource blocks include one or more of a channel estimation, a channel whitening, a wideband precoder selection, or a spectral efficiency computation.

8. The method of claim 1 , wherein the one or more portions of the plurality of resource blocks are sub-sampled prior to performing a channel estimation.

9. The method of claim 1 , wherein the one or more portions of the plurality of resource blocks are sub-sampled based at least in part on a channel estimation output and prior to performing a channel whitening.

10. The method of claim 1 , wherein the one or more portions of the plurality of resource blocks are sub-sampled based at least in part on a channel whitening output and prior to performing a wideband precoder selection.

11. The method of claim 1 , wherein the one or more portions of the plurality of resource blocks are sub-sampled based at least in part on a wideband precoder selection output and prior to performing a spectral efficiency computation.

12. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to:
receive, from a base station, a channel state information reference signal that includes a plurality of resource blocks;
sub-sample one or more portions of the plurality of resource blocks, prior to performing one or more channel state feedback computations, to identify one or more sub-sampled portions of the plurality of resource blocks, wherein the one or more sub-sampled portions comprises fewer resource blocks than the plurality of resource blocks received from the base station;
perform the one or more channel state feedback computations based at least in part on the one or more sub-sampled portions of the plurality of resource blocks; and
transmit, to the base station, a channel state feedback report based at least in part on the one or more channel state feedback computations that are performed based at least in part on the one or more sub-sampled portions of the plurality of resource blocks.

13. The UE of claim 12 , wherein the one or more portions of the plurality of resource blocks are sub-sampled according to a uniform sub-sampling factor.

14. The UE of claim 12 , wherein the one or more sub-sampled portions of the plurality of resource blocks include every Nth resource block among the plurality of resource blocks, where N is an integer having a value greater than one.

15. The UE of claim 12 , wherein the one or more channel state feedback computations include a first channel state feedback computation performed on a first set of resource blocks that includes every Mth resource block among the plurality of resource blocks and a second channel state feedback computation performed on a second set of resource blocks that includes every Nth resource block among the plurality of resource blocks, where M and N are integers with different values greater than one.

16. The UE of claim 12 , wherein the one or more portions of the plurality of resource blocks are sub-sampled according to a non-uniform sub-sampling pattern.

17. The UE of claim 12 , wherein the one or more sub-sampled portions of the plurality of resource blocks include a first subset of the plurality of resource blocks that are outside a target frequency region, and wherein the one or more channel state feedback computations are further performed using a second subset of the plurality of resource blocks that includes all resource blocks within the target frequency region.

18. The UE of claim 12 , wherein the one or more channel state feedback computations performed using the one or more sub-sampled portions of the plurality of resource blocks include one or more of a channel estimation, a channel whitening, a wideband precoder selection, or a spectral efficiency computation.

19. The UE of claim 12 , wherein the one or more portions of the plurality of resource blocks are sub-sampled prior to performing a channel estimation.

20. The UE of claim 12 , wherein the one or more portions of the plurality of resource blocks are sub-sampled based at least in part on a channel estimation output and prior to performing a channel whitening.

21. The UE of claim 12 , wherein the one or more portions of the plurality of resource blocks are sub-sampled based at least in part on a channel whitening output and prior to performing a wideband precoder selection.

22. The UE of claim 12 , wherein the one or more portions of the plurality of resource blocks are sub-sampled based at least in part on a wideband precoder selection output and prior to performing a spectral efficiency computation.

23. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:
one or more instructions that, when execute

Assignees

• Qualcomm Inc

Inventors

• Cheraghi Parisa
• Tom Anas
• Gorokhov Alexei Yurievitch

Classifications

• H04B7/0417

  Feedback systems · CPC title

• H04B7/066 Primary

  Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM] · CPC title

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04B7/0626 Primary

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

• H04L25/0202

  Channel estimation · CPC title