Power control for repeated uplink transmissions

Patent metadata

Field	Value
Publication number	US-2021068062-A1
Application number	US-202017002590-A
Country	US
Kind code	A1
Filing date	Aug 25, 2020
Priority date	Aug 27, 2019
Publication date	Mar 4, 2021
Grant date	—

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may be scheduled to send uplink data to a base station using a particular transmission length provided by the base station. The UE may send multiple repetitions of the uplink data to the base station using transmissions that have varying lengths. The UE may determine a transmit power based on the length provided by the base station and use that transmit power for transmitting the repetitions, regardless of the actual lengths of the repetitions.

First claim

What is claimed is:

1 . A method for wireless communication, comprising:
receiving an uplink grant that schedules a transmission of uplink data using a first number of symbols; identifying, based at least in part on the uplink grant, an uplink transmission opportunity during which the uplink data is to be transmitted, wherein the uplink transmission opportunity includes a second number of symbols different from the first number of symbols; determining a transmission power for the uplink transmission opportunity based at least in part on the first number of symbols; and transmitting the uplink data during the uplink transmission opportunity using the transmission power.

2 . The method of claim 1 , wherein the first number of symbols is a number of symbols in a nominal transmission of a physical uplink shared channel (PUSCH) and the second number of symbols is a number of symbols in an actual transmission of the PUSCH.

3 . The method of claim 1 , wherein the uplink grant schedules a physical uplink shared channel (PUSCH) with a repetition type that permits a nominal transmission of the PUSCH to include one or more actual transmissions of the PUSCH.

4 . The method of claim 1 , wherein the first number of symbols is indicated by a starting and length indicator (SLIV) included in the uplink grant.

5 . The method of claim 1 , further comprising:
determining a reference signal configuration based at least in part on the first number of symbols, wherein determining the transmission power comprises: calculating the transmission power based at least in part on the reference signal configuration.

6 . The method of claim 5 , further comprising:
determining, based at least in part on the reference signal configuration, a number of resource elements for a demodulation reference signal and a phase-tracking reference signal, wherein the transmission power is calculated based at least in part on the number of resource elements.

7 . The method of claim 1 , further comprising:
determining a number of resource elements for transmitting the uplink data based at least in part on the first number of symbols, wherein determining the transmission power comprises: calculating the transmission power based at least in part on the number of resource elements for transmitting the uplink data.

8 . The method of claim 1 , wherein determining the transmission power comprises:
calculating the transmission power based at least in part on a bit per resource element (BPRE) associated with the transmission of uplink data, wherein the BPRE is a function of a number of resource elements scheduled for the transmission of uplink data.

9 . The method of claim 8 , wherein the number of resource elements scheduled for the transmission of uplink data is different from a number of resource elements actually used for the transmission of uplink data.

10 . The method of claim 1 , wherein the second number of symbols is less than the first number of symbols, and wherein the uplink transmission opportunity is for a portion of a scheduled repetition of the uplink data.

11 . The method of claim 1 , wherein the uplink grant includes a repetition factor that indicates the uplink data is to be transmitted multiple times, and wherein the uplink transmission opportunity is determined based at least in part on the repetition factor.

12 . The method of claim 1 , wherein the uplink grant is included in a downlink control information (DCI) message or a radio resource control (RRC) message.

13 . An apparatus for wireless communication, comprising:
a processor, memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to:
receive an uplink grant that schedules a transmission of uplink data using a first number of symbols;
identify, based at least in part on the uplink grant, an uplink transmission opportunity during which the uplink data is to be transmitted, wherein the uplink transmission opportunity includes a second number of symbols different from the first number of symbols;
determine a transmission power for the uplink transmission opportunity based at least in part on the first number of symbols; and
transmit the uplink data during the uplink transmission opportunity using the transmission power.

14 . The apparatus of claim 13 , wherein the first number of symbols is a number of symbols in a nominal transmission of a physical uplink shared channel (PUSCH) and the second number of symbols is a number of symbols in an actual transmission of the PUSCH.

15 . The apparatus of claim 13 , wherein the uplink grant schedules a physical uplink shared channel (PUSCH) with a repetition type that permits a nominal transmission of the PUSCH to include one or more actual transmissions of the PUSCH.

16 . The apparatus of claim 13 , wherein the first number of symbols is indicated by a starting and length indicator (SLIV) included in the uplink grant.

17 . The apparatus of claim 13 , wherein the instructions executable to by the processor to cause the apparatus to:
determine a reference signal configuration based at least in part on the first number of symbols; and calculate the transmission power based at least in part on the reference signal configuration.

18 . The apparatus of claim 17 , wherein the instructions executable to by the processor to cause the apparatus to:
determine, based at least in part on the reference signal configuration, a number of resource elements for a demodulation reference signal and a phase-tracking reference signal, wherein the transmission power is calculated based at least in part on the number of resource elements.

19 . The apparatus of claim 13 , wherein the instructions executable to by the processor to cause the apparatus to:
determine a number of resource elements for transmitting the uplink data based at least in part on the first number of symbols; and calculate the transmission power based at least in part on the number of resource elements for transmitting the uplink data.

20 . The apparatus of claim 13 , wherein the instructions executable to by the processor to cause the apparatus to determine the transmission power are executable by the processor to cause the apparatus to:
calculate the transmission power based at least in part on a bit per resource element (BPRE) associated with the transmission of uplink data, wherein the BPRE is a function of a number of resource elements scheduled for the transmission of uplink data.

21 . The apparatus of claim 20 , wherein the number of resource elements scheduled for the transmission of uplink data is different from a number of resource elements actually used for the transmission of uplink data.

22 . The apparatus of claim 13 , wherein the second number of symbols is less than the first number of symbols, and wherein the uplink transmission opportunity is for a portion of a scheduled repetition of the uplink data.

23 . An apparatus for wireless communication, comprising:
means for receiving an uplink grant that schedules a transmission of uplink data using a first number of symbols; means for identifying, based at least in part on the uplink grant, an uplink transmission opportunity during which the uplink data is to be transmitted, wherein the uplink transmission opportunity includes a second number of symbols different from the first number of symbols; means for determining a transmission power f

Assignees

• Qualcomm Inc

Inventors

• Yang Wei
• Fakoorian Seyed Ali Akbar
• Hosseini Seyedkianoush

Classifications

• H04W72/23

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

• H04W72/1263

  Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows · CPC title

• H04W72/1268

  of uplink data flows · CPC title

• H04W52/38 Primary

  TPC being performed in particular situations · CPC title

• H04W52/146 Primary

  Uplink power control · CPC title