Determining beam failure based on a dynamic range of transmission power ratios

Patent metadata

Field	Value
Publication number	US-2020328795-A1
Application number	US-201816764990-A
Country	US
Kind code	A1
Filing date	Jul 25, 2018
Priority date	Nov 17, 2017
Publication date	Oct 15, 2020
Grant date	—

Abstract

Methods, systems, and devices for wireless communication are described that support beam failure determination based on a dynamic range of transmission power ratios between two reference signals (e.g., between a channel state information reference signal (CSI-RS) and a demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH)). A wireless device may identify the dynamic range of transmission power ratios that may be used by a base station (e.g., via indications of maximum and minimum transmission power ratios, indications of one or more offsets from some average transmission power ratio, etc. sent from the base station). The wireless device may use the identified dynamic range of transmission power ratios, along with a CSI-RS measurement, to determine a range of hypothetical block error rates (BLERs). Values within the range of hypothetical BLERs may be compared to a threshold in order to determine a beam failure status (e.g., a beam failure).

First claim

What is claimed is:

1 . A method for wireless communication, comprising:
identifying a dynamic range of a transmission power ratio between a first reference signal and a second reference signal of a downlink control channel received from a base station; determining a beam failure status based at least in part on the dynamic range of the transmission power ratio; and communicating with the base station in accordance with the beam failure status.

2 . The method of claim 1 , wherein the first reference signal is a channel state information reference signal (CST-RS) and the second reference signal is a demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH).

3 . The method of claim 2 , wherein identifying the dynamic range of the transmission power ratio comprises:
receiving an indication of the dynamic range of the transmission power ratio from the base station.

4 . The method of claim 3 , wherein the indication includes a maximum value associated with the dynamic range of the transmission power ratio and a minimum value associated with the dynamic range of the transmission power ratio.

5 . The method of claim 3 , wherein the indication includes a maximum positive offset associated with the dynamic range of the transmission power ratio and a maximum negative offset associated with the dynamic range of the transmission power ratio.

6 . The method of claim 3 , wherein the indication includes an offset value that represents both a maximum positive offset associated with the dynamic range of the transmission power ratio and a maximum negative offset associated with the dynamic range of the transmission power ratio.

7 . The method of claim 3 , further comprising:
determining the dynamic range of the transmission power ratio based at least in part on a maximum positive offset, a maximum negative offset, and an average transmission power ratio.

8 . The method of claim 3 , wherein the indication is received via at least one of radio resource control (RRC), a medium access control (MAC) control element (MAC CE), or downlink control information (DCI).

9 . The method of claim 2 , wherein identifying the dynamic range of the transmission power ratio comprises:
receiving an indication of a configuration of the CSI-RS; and determining the dynamic range of the transmission power ratio based at least in part n the indication of the configuration of the CSI-RS.

10 . The method of claim 9 , wherein the configuration includes at least one of quasi-co-location (QCL) information, a measurement quantity related to the CSI-RS, and a CSI report setting associated with the CSI-RS.

11 . The method of claim 9 , wherein the indication of the configuration of the CSI-RS is received via radio resource control (RRC) signaling.

12 . The method of claim 9 , wherein identifying the dynamic range of the transmission power ratio further comprises:
identifying a maximum value associated with the dynamic range of the transmission power ratio and a minimum value associated with the dynamic range of the transmission power ratio based at least in part on the configuration of the CSI-RS.

13 . The method of claim 9 , wherein identifying the dynamic range of the transmission power ratio further comprises:
identifying an offset associated with the dynamic range based at least in part on the configuration of the CSI-RS.

14 . The method of claim 9 , wherein identifying the dynamic range of the transmission power ratio further comprises:
identifying a maximum positive offset and a maximum negative offset associated with the dynamic range based at least in part on the configuration of the CSI-RS.

15 . The method of claim 9 , wherein identifying the dynamic range ofthe transmission power ratio further comprises:
identifying a maximum CSI-RS to DMRS power ratio and a minimum CSI-RS to DMRS power ratio based at least in part on the configuration of the CSI-RS.

16 . The method of claim 2 , wherein identifying the dynamic range of the transmission power ratio comprises:
receiving an indication of a power ratio between the CSI-RS and a physical downlink shared channel (PDSCH) received from the base station; and determining the dynamic range of the transmission power ratio based at east in part on the power ratio between the CSI-RS and the PDSCH.

17 . The method of claim 2 , further comprising:
determining a beam failure has occurred based at least in part on the determined beam failure status; and transmitting a beam failure report to the base station.

18 . The method of claim 2 , wherein the dynamic range of the transmission power ratio is identified per CSI-RS resource, per CSI-RS resource set, or per CSI-RS resource setting.

19 . The method of claim 2 , further comprising:
determining an upper hypothetical PDCCH block error rate (BLER) and a lower hypothetical PDCCH BLER based at least in part on the dynamic range; and determining the beam failure status based at least in part on the upper hypothetical PDCCH BLER, the lower hypothetical PDCCH BLER, or both.

20 . The method of claim 19 , further comprising:
performing a CSI-RS measurement; and determining the beam failure status based at least in part on the upper hypothetical PDCCH BLER, the lower hypothetical PDCCH BLER, the CSI-RS measurement, or some combination thereof.

21 . A method for wireless communication, comprising:
identifying a dynamic range of a transmission power ratio between a first reference signal and a second reference signal of a downlink control channel to a user equipment (UE); transmitting, to the UE, a signal that facilitates identification of the dynamic range of the transmission power ratio by the UE; receiving a beam failure status report based at least in part on the dynamic range of the transmission power ratio; and communicating with the UE in accordance with the beam failure status report.

22 . The method of claim 21 , wherein the first reference signal is a channel state information reference signal (CSI-RS) and the second reference signal is a demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH).

23 . The method of claim 22 , wherein the signal includes an indication of the dynamic range of the transmission power ratio.

24 . The method of claim 23 . wherein the indication includes a maximum value associated with the dynamic range of the transmission power ratio and a minimum value associated with the dynamic range of the transmission power ratio.

25 . The method of claim 23 , wherein the indication includes a maximum positive offset associated with the dynamic range of the transmission power ratio and a maximum negative offset associated with the dynamic range of the transmission power ratio.

26 . The method of claim 23 , wherein the indication includes an offset value that represents both a maximum positive offset associated with the dynamic range of the transmission power ratio and a maximum negative offset associated with the dynamic range of the transmission power ratio.

27 . The method of claim 23 , wherein the dynamic range of the transmission power ratio is determined based at least in part on a maximum positive offset, a maximum negative offset, and an average transmission power ratio.

28 . The method of claim 23 , wherein the indication is transmitted via at least one of

Assignees

• Hao Chenxi
• Manolakos Alexandros
• Luo Tao
• Zhang Yu
• Qualcomm Inc

Inventors

• Hao Chenxi
• Manolakos Alexandros
• Luo Tao
• Zhang Yu

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04B17/309

  Measuring or estimating channel quality parameters · CPC title

• H04W24/10

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

• H04W72/1273

  of downlink data flows · CPC title

• H04W72/232

  the control data signalling from the physical layer, e.g. DCI signalling · CPC title