Techniques for channel state information acquisition in new radio technology

Patent metadata

Field	Value
Publication number	US-11018745-B2
Application number	US-201716324710-A
Country	US
Kind code	B2
Filing date	Aug 11, 2017
Priority date	Aug 12, 2016
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

Certain aspects of the present disclosure provide techniques for channel state information acquisition in wireless communication systems operating according to new radio (NR) technologies. An exemplary method that may be performed by a user equipment (UE) generally includes receiving a first beamformed channel state information reference signal (CSI-RS), determining, based on the first beamformed CSI-RS and the beacon reference signal, information regarding an adjustment, preferred by the UE, of a beam-former to be used for a forthcoming second beamformed CSI-RS, transmitting a beamformer adjustment indicator (BAI), periodically, semi-persistently, or aperiodically, that indicates the preferred adjustment, and reporting channel state information feedback (CSF), based on the first beamformed CSI-RS.

First claim

What is claimed is:

1. A method for wireless communications performed by a user equipment (UE), comprising:
obtaining a configuration of a beacon reference signal, wherein the configuration comprises at least one of: antenna ports used for transmitting the beacon reference signal, a frequency used for transmitting the beacon reference signal, a time for transmitting the beacon reference signal, a period for transmitting the beacon reference signal, a subframe offset for transmitting the beacon reference signal, or a slot offset for transmitting the beacon reference signal;
obtaining an indication of an association between a first beamformed channel state information reference signal (CSI-RS) and the beacon reference signal;
receiving the first beamformed CSI-RS and the beacon reference signal;
determining, based on the first beamformed CSI-RS and the beacon reference signal, information regarding an adjustment, preferred by the UE, of a beamformer to be used for a forthcoming second beamformed CSI-RS, wherein the information comprises an amount of benefit of adjusting the first beamformed CSI-RS toward the beacon reference signal;
transmitting a beamformer adjustment indicator (BAI), periodically, semi-persistently, or aperiodically, that indicates the preferred adjustment; and
reporting channel state information feedback (CSF), based on the first beamformed CSI-RS.

2. The method of claim 1 , wherein the information is determined based on a plurality of beacon reference signals, and the method further comprises:
obtaining an indication of a number of beacon reference signals to use in determining the information.

3. A method for wireless communications performed by a user equipment (UE), comprising:
obtaining a configuration of a beacon reference signal, wherein the configuration comprises at least one of: antenna ports used for transmitting the beacon reference signal, a frequency used for transmitting the beacon reference signal, a time for transmitting the beacon reference signal, a period for transmitting the beacon reference signal, a subframe offset for transmitting the beacon reference signal, or a slot offset for transmitting the beacon reference signal;
obtaining an indication of an association between a first beamformed channel state information reference signal (CSI-RS) and the beacon reference signal;
receiving the first beamformed CSI-RS and the beacon reference signal;
determining, based on the first beamformed CSI-RS and the beacon reference signal, information regarding an adjustment, preferred by the UE, of a beamformer to be used for a forthcoming second beamformed CSI-RS;
transmitting a beamformer adjustment indicator (BAI), periodically, semi-persistently, or aperiodically, that indicates the UE-preferred adjustment and which first beamformed CSI-RS, of a plurality of first beamformed CSI-RSs, the BAI is based on; and
reporting channel state information feedback (CSF), based on the first beamformed CSI-RS.

4. A method for wireless communications, comprising:
transmitting a configuration of a beacon reference signal, wherein the configuration comprises at least one of: antenna ports used for transmitting the beacon reference signal, a frequency used for transmitting the beacon reference signal, a time for transmitting the beacon reference signal, a period for transmitting the beacon reference signal, a subframe offset for transmitting the beacon reference signal, or a slot offset for transmitting the beacon reference signal;
transmitting an indication of an association between a first beamformed channel state information reference signal (CSI-RS) and the beacon reference signal;
transmitting the first beamformed CSI-RS and the beacon reference signal;
receiving a beamformer adjustment indicator (BAI) that indicates information regarding adjustment of a forthcoming second beamformed CSI-RS, wherein the information comprises an amount of benefit of adjusting the first beamformed CSI-RS toward the beacon reference signal;
receiving channel state information feedback (CSF); and
transmitting the second beamformed CSI-RS, based on the information and the previously transmitted first beamformed CSI-RS.

5. The method of claim 4 , further comprising:
transmitting a trigger, wherein the BAI is transmitted in response to the trigger.

6. The method of claim 4 , wherein the information is determined based on a plurality of beacon reference signals, and the method further comprises:
transmitting an indication of a number of beacon reference signals to use in determining the information.

7. The method of claim 4 , wherein the BAI indicates information for adjusting a plurality of forthcoming second beamformed CSI-RSs.

8. A method for wireless communications, comprising:
transmitting a configuration of a beacon reference signal, wherein the configuration comprises at least one of: antenna ports used for transmitting the beacon reference signal, a frequency used for transmitting the beacon reference signal, a time for transmitting the beacon reference signal, a period for transmitting the beacon reference signal, a subframe offset for transmitting the beacon reference signal, or a slot offset for transmitting the beacon reference signal;
transmitting an indication of an association between a first beamformed channel state information reference signal (CSI-RS) and the beacon reference signal;
transmitting the first beamformed CSI-RS and the beacon reference signal;
receiving a beamformer adjustment indicator (BAI) that indicates information regarding adjustment of a forthcoming second beamformed CSI-RS and which first beamformed CSI-RS, of a plurality of first beamformed CSI-RSs, the BAI is based on;
receiving channel state information feedback (CSF); and
transmitting the second beamformed CSI-RS, based on the information and the previously transmitted first beamformed CSI-RS.

9. An apparatus for wireless communications performed, comprising:
means for obtaining a configuration of a beacon reference signal, wherein the configuration comprises at least one of: antenna ports used for transmitting the beacon reference signal, a frequency used for transmitting the beacon reference signal, a time for transmitting the beacon reference signal, a period for transmitting the beacon reference signal, a subframe offset for transmitting the beacon reference signal, or a slot offset for transmitting the beacon reference signal;
means for obtaining an indication of an association between a first beamformed channel state information reference signal (CSI-RS) and the beacon reference signal;
means for receiving the first beamformed CSI-RS and the beacon reference signal;
means for determining, based on the first beamformed CSI-RS and the beacon reference signal, information regarding an adjustment, preferred by the apparatus, of a beamformer to be used for a forthcoming second beamformed CSI-RS, wherein the information comprises an amount of benefit of adjusting the first beamformed CSI-RS toward the beacon reference signal;
means for transmitting a beamformer adjustment indicator (BAI), periodically, semi-persistently, or aperiodically, that indicates the preferred adjustment; and
means for reporting channel state information feedback (CSF), based on the first beamformed CSI-RS.

10. The apparatus of claim 9 , wherein the means for determining the information comprises means for determining the information based on a plurality of beacon reference signals, and the apparatus further comprises:
means for obtaining an indication of a number of beacon reference signals to use in determining the information.

11. An apparatus for wireless communications performed, comprising:
me

Assignees

• Qualcomm Inc

Inventors

• Zhang Yu
• Wei Chao
• Hou Jilei

Classifications

• H04L1/0026 Primary

  Transmission of channel quality indication · CPC title

• H04L1/06

  using space diversity · CPC title

• H04B7/06

  at the transmitting station · CPC title

• H04L1/00

  Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)} · CPC title

• H04L1/0031

  Multiple signaling transmission (H04L1/1664, F15 take precedence) · CPC title