Frequency domain segmentation for performance enhancement of channel state feedback

Patent metadata

Field	Value
Publication number	US-11159219-B2
Application number	US-202017084550-A
Country	US
Kind code	B2
Filing date	Oct 29, 2020
Priority date	Oct 31, 2019
Publication date	Oct 26, 2021
Grant date	Oct 26, 2021

Abstract

Aspects of the disclosure relate to a wireless user equipment (UE) determining a wideband channel quality indicator (CQI) in a wireless communication network. For each of a plurality of CQI hypotheses, a UE divides a bandwidth into a plurality of frequency segments and determines an average spectral efficiency (SPEF) for each of those segments. Further, for each of the plurality of CQI hypotheses, the UE determines the minimum of the average SPEFs. The UE selects the CQI hypothesis corresponding to the maximum from among these determined minimum average SPEFs, and transmits this selected CQI as a wideband CQI. Other aspects, embodiments, and features are also claimed and described.

First claim

The invention claimed is:

1. A method of wireless communication operable at a user equipment (UE), the method comprising:
receiving a plurality of reference signals associated with a plurality of physical resource blocks (PRBs) corresponding to a bandwidth;
for each of a plurality of channel quality indicator (CQI) hypotheses:
determining one or more average spectral efficiencies (SPEFs) corresponding to one or more frequency segments of the bandwidth based on one or more sets of reference signals of the plurality of reference signals corresponding to the one or more frequency segments; and
selecting a first SPEF from among the one or more average SPEFs; and

selecting a second SPEF from among a plurality of first SPEFs corresponding to the plurality of CQI hypotheses; and
transmitting channel state feedback comprising a wideband CQI corresponding to the second SPEF.

2. The method of claim 1 , wherein the selecting the first SPEF comprises:
selecting, as the first SPEF, a minimum average SPEF from among the one or more average SPEFs.

3. The method of claim 2 , wherein the selecting, as the first SPEF, the minimum average SPEF comprises:
excluding any determined average SPEF that falls below a SPEF threshold value, such that the determined minimum average SPEF is the lowest average SPEF falling above the SPEF threshold value.

4. The method of claim 1 , wherein the selecting the second SPEF comprises:
selecting, as the second SPEF, a maximum average SPEF from among the one or more average SPEFs.

5. The method of claim 1 , wherein for each of the plurality of CQI hypotheses, a frequency segment of the one or more frequency segments comprises a set of the plurality of PRBs,
the method further comprising:
for each of the plurality of CQI hypotheses, determining a number of the plurality of PRBs in the frequency segment of the one or more frequency segments based on at least one of: a rank, a code block size for the corresponding CQI hypothesis, or a SPEF corresponding to the bandwidth for the corresponding CQI hypothesis.

6. The method of claim 1 , wherein for each of the plurality of CQI hypotheses, a frequency segment of the one or more frequency segments comprises a plurality of subbands, a subband of the plurality of subbands comprising a set of the plurality of PRBs,
the method further comprising:
for each of the plurality of CQI hypotheses, determining a number of the plurality of subbands in the frequency segment of the one or more frequency segments based on at least one of: a rank, a code block size for the corresponding CQI hypothesis, a SPEF corresponding to the bandwidth for the corresponding CQI hypothesis, or a total number of PRBs in the subband of the plurality of subbands.

7. The method of claim 6 , wherein the determining one or more average SPEFs comprises:
determining a plurality of average SPEFs corresponding to the plurality of subbands; and
determining the one or more average SPEFs corresponding to the one or more frequency segments based on one or more sets of average SPEFs of the plurality of average SPEFs corresponding to the one or more frequency segments.

8. The method of claim 1 , wherein the selecting the second SPEF from among the plurality of first SPEFs corresponding to the plurality of CQI hypotheses comprises:
for each of a plurality of ranks, selecting a rank-specific SPEF among the plurality of first SPEFs corresponding to the plurality of CQI hypotheses, the rank-specific SPEF corresponding to a maximum SPEF from among the plurality of first SPEFs; and
selecting the second SPEF from among a plurality of rank-specific SPEFs corresponding to the plurality of ranks, the second SPEF corresponding to a maximum SPEF from among the plurality of rank-specific SPEFs.

9. A user equipment (UE) configured for wireless communication, the UE comprising:
a processor;
a transceiver communicatively coupled to the processor; and
a memory communicatively coupled to the processor,
wherein the processor and the memory are configured for:
receiving a plurality of reference signals associated with a plurality of physical resource blocks (PRBs) corresponding to a bandwidth;
for each of a plurality of channel quality indicator (CQI) hypotheses:
determining one or more average spectral efficiencies (SPEFs) corresponding to one or more frequency segments of the bandwidth based on one or more sets of reference signals of the plurality of reference signals corresponding to the one or more frequency segments; and
selecting a first SPEF from among the one or more average SPEFs; and

selecting a second SPEF from among a plurality of first SPEFs corresponding to the plurality of CQI hypotheses; and
transmitting channel state feedback comprising a wideband CQI corresponding to the second SPEF.

10. The UE of claim 9 , wherein the selecting the first SPEF comprises:
selecting, as the first SPEF, a minimum average SPEF from among the one or more average SPEFs.

11. The UE of claim 10 , wherein the selecting, as the first SPEF, the minimum average SPEF comprises:
excluding any determined average SPEF that falls below a SPEF threshold value, such that the determined minimum average SPEF is the lowest average SPEF falling above the SPEF threshold value.

12. The UE of claim 9 , wherein the selecting the second SPEF comprises:
selecting, as the second SPEF, a maximum average SPEF from among the one or more average SPEFs.

13. The UE of claim 9 , for each of the plurality of CQI hypotheses, a frequency segment of the one or more frequency segments comprises a set of the plurality of PRBs,
wherein the processor and the memory are further configured for:
for each of the plurality of CQI hypotheses, determining a number of the plurality of PRBs in the frequency segment of the one or more frequency segments based on at least one of: a rank, a code block size for the corresponding CQI hypothesis, or a SPEF corresponding to the bandwidth for the corresponding CQI hypothesis.

14. The UE of claim 9 , wherein for each of the plurality of CQI hypotheses, a frequency segment of the one or more frequency segments comprises a plurality of subbands, a subband of the plurality of subbands comprising a set of the plurality of PRBs,
wherein the processor and the memory are further configured for:
for each of the plurality of CQI hypotheses, determining a number of the plurality of subbands in the frequency segment of the one or more frequency segments based on at least one of: a rank, a code block size for the corresponding CQI hypothesis, a SPEF corresponding to the bandwidth for the corresponding CQI hypothesis, or a total number of PRBs in the subband of the plurality of subbands.

15. The UE of claim 14 , wherein the determining one or more average SPEFs comprises:
determining a plurality of average SPEFs corresponding to the plurality of subbands; and
determining the one or more average SPEFs corresponding to the one or more frequency segments based on one or more sets of average SPEFs of the plurality of average SPEFs corresponding to the one or more frequency segments.

16. The UE of claim 9 , wherein the selecting the second SPEF from among the plurality of first SPEFs corresponding to the plurality of CQI hypotheses comprises:
for each of a plurality of ranks, selecting a rank-specific SPEF among the plurality of first SPEFs corresponding to the plurality of CQI hypotheses, the rank-specific SPEF corresponding to a maximum SPEF from among the plurality of first SPEFs; and
selecting the second SPEF from among a plurality of rank-specific SPEFs corresponding to

Assignees

• Qualcomm Inc

Inventors

• Cheraghi Parisa
• Rahman Md Jahidur
• Levy Sharon
• Gorokhov Alexei Yurievitch

Classifications

• H04B7/0456

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

• H04B7/0632 Primary

  Channel quality parameters, e.g. channel quality indicator [CQI] · CPC title

• H04B7/063

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

• H04B7/0417

  Feedback systems · CPC title

• H04L1/0026 Primary

  Transmission of channel quality indication · CPC title