Channel quality information and beam index reporting

Patent metadata

Field	Value
Publication number	US-9237475-B2
Application number	US-201313781311-A
Country	US
Kind code	B2
Filing date	Feb 28, 2013
Priority date	Mar 9, 2012
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

A method and apparatus report or identify channel quality information. The method for reporting includes selecting one or more beams for channel quality reporting. The method also includes mapping, by the UE, indices of the one or more selected beams to one or more channel quality values. Additionally, the method includes sending channel quality information for the one or more selected beams according to the mapping. The method for identifying includes receiving an indication of indices of one or more beams selected for reporting. The method also includes receiving channel quality information for the one or more selected beams. The method further includes identifying a mapping of the indices of the one or more selected beams to one or more channel quality values. Additionally, the method includes identifying a channel quality value for each of the one or more selected beams according to the mapping.

First claim

What is claimed is:

1. A method for reporting channel quality information by a user equipment (UE), the method comprising:
selecting beams for channel quality reporting;
mapping, by the UE, indices of the selected beams to one or more channel quality values;
indicating indices of the selected beams during one portion of a reporting period; and
sending channel quality information for the selected beams according to the mapping during an other portion of the reporting period, the channel quality information sent during the other portion indicating more than one channel quality value for one of the selected beams before any re-indication of the index of the one selected beam during the reporting period.

2. The method of claim 1 further comprising:
measuring channel quality parameters associated with signals received on a plurality of beams;
selecting the beams for channel quality reporting from the plurality of beams based on the measured channel quality parameters.

3. The method of claim 1 further comprising identifying, based on a configuration message received from a base station, a number of the beams for channel quality reporting as one of a pre-specified number of beams or a UE selectable number of beams.

4. The method of claim 1 , wherein the channel quality values are values for a channel quality indicator (CQI), the method further comprising:
determining a CQI reporting mode based on a configuration message received from a base station,
wherein mapping the indices of the selected beams to the one or more CQI values comprises mapping the indices of the selected beams to the one or more CQI values according to the CQI reporting mode, and
wherein sending the channel quality information for the selected beams according to the mapping comprises sending the channel quality information according to the CQI reporting mode.

5. The method of claim 4 , wherein sending the channel quality information according to the CQI reporting mode comprises during the other portion of the reporting period one of:
sending one CQI report for all of the selected beams at each feedback opportunity in the other portion;
sending a CQI report for only the selected beams having a CQI value that is greater than a threshold CQI value;
sending a differential value representing a difference of a CQI value for a selected beam with respect to a threshold CQI value; or
sending a successive CQI value representing a difference of a CQI value for a selected beam with respect to a CQI value for a previously reported beam.

6. The method of claim 1 , wherein:
the selected beams are a subset of available beams for channel quality reporting; and
indicating the indices of the selected beams comprises sending a message comprising an indication of the selected subset of beams being reported according to an indexing scheme for reporting the indices of the selected subset of beams prior to sending the channel quality information for the selected beams.

7. The method of claim 6 further comprising:
determining whether to modify the selected subset of beams being reported; and
in response to determining to modify the selected subset, sending, after the other portion of the reporting period, a message comprising an indication of the modified subset of beams being reported according to a pre-specified reporting periodicity.

8. The method of claim 6 , wherein the channel quality values are values for a channel quality indicator (CQI), the method further comprising:
determining a CQI reporting mode based on a configuration message received from a base station,
wherein sending the channel quality information for the selected beams according to the mapping comprises sending the channel quality information according to the CQI reporting mode.

9. The method of claim 1 further comprising sending a message comprising an indication of the indices of the selected beams according to a codebook of beams, wherein the codebook includes multiple levels, and wherein beam indices selectable in a lower level in the codebook are dependent upon a selected beam index of a higher level in the codebook.

10. The method of claim 9 , wherein each of the multiple levels in the codebook is associated with a respective feedback periodicity, and wherein a feedback periodicity for the lower level is shorter than a feedback periodicity for the higher level.

11. The method of claim 9 further comprising:
determining whether to modify the selection of the one or more beams selected for channel quality reporting;
in response to determining to modify the selection, determining whether a beam index of a newly selected beam is within a range of beam indices selected from the higher level in the codebook; and
in response to determining that the beam index is not within the range of beam indices, sending a message comprising an indication of the beam index of the newly selected beam according to a feedback periodicity associated with the higher level.

12. The method of claim 1 , wherein the channel quality values are values for a channel quality indicator (CQI), the method further comprising:
determining a CQI reporting mode based on a configuration message received from a base station; and
in response to the UE being unable to send the channel quality information according to the CQI reporting mode, sending the channel quality information as a default CQI report including a default CQI for a beam.

13. An apparatus in a user equipment (UE) configured to report channel quality information, the apparatus comprising:
a controller configured to select beams for channel quality reporting, and map indices of the selected beams to one or more channel quality values; and
a transmitter configured to indicate indices of the selected beams during one portion of a reporting period; and send channel quality information for the selected beams according to the mapping during an other portion of the reporting period, the channel quality information sent during the other portion indicating more than one channel quality value for one of the selected beams before any re-indication of the index of the one selected beam during the reporting period.

14. The apparatus of claim 13 , wherein:
the controller is configured to measure channel quality parameters associated with signals received on a plurality of beams, and select the beams for channel quality reporting from the plurality of beams based on the measured channel quality parameters.

15. The apparatus of claim 13 , wherein the controller is configured to identify, based on a configuration message received from a base station, a number of the beams for channel quality reporting as one of a pre-specified number of beams or a UE selectable number of beams.

16. The apparatus of claim 13 , wherein the channel quality values are values for a channel quality indicator (CQI), wherein:
the controller is configured to identify a CQI reporting mode based on a configuration message received from a base station, and map the indices of the selected beams to the one or more CQI values according to the identified CQI reporting mode, and
the transmitter is configured send the channel quality information according to the CQI reporting mode.

17. The apparatus of claim 16 , wherein in sending the channel quality information according to the CQI reporting mode, the transmitter is further configured to, during the other portion of the reporting period, one of:
send one CQI report for all of the selected beams at each feedback opportunity in the other portion,
send a CQI report for only the selected beams hav

Assignees

• Samsung Electronics Co Ltd

Inventors

• Josiam Kaushik Morapakkam
• Gupta Ankit
• Abu-Surra Shadi
• Pi Zhouyue
• Li Ying
• Rajagopal Sridhar

Classifications

• H04W72/046 Primary

  the resource being in the space domain, e.g. beams · CPC title

• H04W24/10 Primary

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04L5/0057

  Physical resource allocation for CQI · CPC title

• H04L5/0023

  Time-frequency-space · CPC title

• H04B7/06952

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