Power headroom report procedure for a wireless network

Patent metadata

Field	Value
Publication number	US-11044676-B2
Application number	US-201916554145-A
Country	US
Kind code	B2
Filing date	Aug 28, 2019
Priority date	Sep 27, 2018
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

Aspects of the disclosure relate to communication of power headroom reports in wireless communication networks. A user equipment (UE) may measure a path loss based on a triggering path loss reference signal (PL-RS) and trigger generation of a power headroom report (PHR) based on the path loss. The UE may identify uplink resources for communication of the PHR to a base station and determine whether the uplink resources are quasi-co-located with the triggering PL-RS. When the uplink resources are quasi-co-located with the triggering PL-RS, the user equipment may transmit the PHR utilizing the uplink resources. Otherwise, the UE may generate the PHR such that it includes information identifying the triggering PL-RS.

First claim

What is claimed is:

1. A method of wireless communication at a scheduled entity, comprising:
measuring a path loss based on a triggering path loss reference signal (PL-RS) of a plurality of PL-RS;
triggering generation of a power headroom report (PHR) based on the path loss;
identifying uplink resources for communication of the PHR to a scheduling entity;
determining whether the uplink resources are quasi-co-located (QCLd) with the triggering PL-RS; and
transmitting the PHR over the uplink resources, wherein the PHR indicates the triggering PL-RS, wherein the PHR comprises information associated with the triggering PL-RS when the uplink resources are not QCLd with the triggering PL-RS, and wherein the PHR excludes the information associated with the triggering PL-RS when the uplink resources are QCLd with the triggering PL-RS.

2. The method of claim 1 , wherein the information associated with the triggering PL-RS comprises a first index of the triggering PL-RS.

3. The method of claim 2 , wherein the information associated with the triggering PL-RS further comprises at least one of a second index of a serving cell corresponding to the triggering PL-RS or a power headroom value corresponding to the triggering PL-RS.

4. The method of claim 2 , further comprising:
generating a medium access control (MAC) control element (CE) comprising the first index of the triggering PL-RS.

5. The method of claim 1 , further comprising:
receiving one or more parameters indicating whether the uplink resources are quasi-co-located (QCLd) with the triggering PL-RS.

6. The method of claim 5 , wherein the one or more parameters comprises a transmission configuration indicator (TCI) state.

7. The method of claim 1 , wherein triggering generation of the PHR further comprises:
triggering generation of the PHR when a change in the path loss is greater than a threshold value.

8. The method of claim 1 , further comprising:
receiving at least one previous uplink grant of additional uplink resources; and
preventing the scheduled entity from utilizing the additional uplink resources to transmit the PHR when the additional uplink resources are not QCLd with the triggering PL-RS.

9. A scheduled entity configured for wireless communication, comprising:
a processor;
a transceiver communicatively coupled to the processor; and
a memory communicatively coupled to the processor, wherein the processor is configured to:
measure a path loss based on a triggering path loss reference signal (PL-RS) of a plurality of PL-RS;
trigger generation of a power headroom report (PHR) based on the path loss;
identify uplink resources for communication of the PHR to a scheduling entity;
determine whether the uplink resources are quasi-co-located (QCLd) with the triggering PL-RS; and
transmit the PHR over the uplink resources via the transceiver, wherein the PHR indicates the triggering PL-RS, wherein the PHR comprises information associated with the triggering PL-RS when the uplink resources are not QCLd with the triggering PL-RS, and wherein the PHR excludes the information associated with the triggering PL-RS when the uplink resources are QCLd with the triggering PL-RS.

10. The scheduled entity of claim 9 , wherein the information associated with the triggering PL-RS comprises a first index of the triggering PL-RS.

11. The scheduled entity of claim 10 , wherein the information associated with the triggering PL-RS further comprises at least one of a second index of a serving cell corresponding to the triggering PL-RS or a power headroom value corresponding to the triggering PL-RS.

12. The scheduled entity of claim 10 , wherein the processor is further configured to:
generate a medium access control (MAC) control element (CE) comprising the first index of the triggering PL-RS.

13. The scheduled entity of claim 9 , wherein the processor is further configured to:
receive one or more parameters indicating whether the uplink resources are quasi-co-located (QCLd) with the triggering PL-RS.

14. The scheduled entity of claim 13 , wherein the one or more parameters comprises a transmission configuration indicator (TCI) state.

15. The scheduled entity of claim 9 , wherein the processor is further configured to:
trigger generation of the PHR when a change in the path loss is greater than a threshold value.

16. The scheduled entity of claim 9 , wherein the processor is further configured to:
receive at least one previous uplink grant of additional uplink resources; and
prevent the scheduled entity from utilizing the additional uplink resources to transmit the PHR when the additional uplink resources are not QCLd with the triggering PL-RS.

17. A method of wireless communication at a scheduling entity, comprising:
transmitting a plurality of path loss reference signals (PL-RS) comprising a triggering PL-RS to a user equipment (UE);
scheduling uplink resources for use by the scheduling entity; and
receiving a power headroom report (PHR) over the uplink resources in response to the triggering PL-RS, wherein the PHR indicates the triggering PL-RS, wherein the PHR comprises information associated with the triggering PL-RS when the uplink resources are not quasi-co-located (QCLd) with the triggering PL-RS, and wherein the PHR excludes the information associated with the triggering PL-RS when the uplink resources are QCLd with the triggering PL-RS.

18. The method of claim 17 , wherein the information associated with the triggering PL-RS comprises a first index of the triggering PL-RS.

19. The method of claim 18 , wherein the information associated with the triggering PL-RS further comprises at least one of a second index configured to identify a serving cell corresponding to the triggering PL-RS or a power headroom value corresponding to the triggering PL-RS.

20. The method of claim 18 , wherein the PHC comprises a medium access control (MAC) control element (CE) comprising the first index of the triggering PL-RS.

21. The method of claim 17 , further comprising:
transmitting one or more parameters indicating whether the uplink resources are quasi-co-located (QCLd) with the triggering PL-RS.

22. The method of claim 21 , wherein the one or more parameters comprises a transmission configuration indicator (TCI) state.

23. A scheduling entity configured for wireless communication, comprising:
a processor;
a transceiver communicatively coupled to the processor; and
a memory communicatively coupled to the processor, wherein the processor is configured to:
transmit a plurality of path loss reference signals (PL-RS) comprising a triggering PL-RS to a user equipment (UE) via the transceiver;
schedule uplink resources for use by the scheduling entity; and
receive a power headroom report (PHR) within the uplink resources in response to the triggering PL-RS, wherein the PHR indicates the triggering PL-RS, wherein the PHR comprises information associated with the triggering PL-RS when the uplink resources are not quasi-co-located (QCLd) with the triggering PL-RS, and wherein the PHR excludes the information associated with the triggering PL-RS when the uplink resources are QCLd with the triggering PL-RS.

24. The scheduling entity of claim 23 , wherein the information associated with the triggering PL-RS comprises a first index of the triggering PL-RS and further comprises at least one of a second index configured to identify a serving cell corresponding to the triggering PL

Assignees

• Qualcomm Inc

Inventors

• He Linhai
• Wang Xiao Feng

Classifications

• H04W72/23

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

• H04W52/325

  Power control of control or pilot channels · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04W80/02

  Data link layer protocols · CPC title

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title