POWER HEADROOM REPORTING IN COVERAGE EDGE

• US 20190313441A1
• Filed: 04/03/2019
• Published: 10/10/2019
• Est. Priority Date: 04/05/2018
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: ZHU, Xipeng, HE, Linhai, SHUKAIR, Mutaz Zuhier Afif, ZHANG, Xiaoxia, HORN, Gavin Bernard, KITAZOE, Masato, WANG, Xiao Feng, CHIN, Tom
• Granted Patent: US 11,956,787 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 5/00 Arrangements affording multiple use of the transmission path
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 80/02 Data link layer protocols

Abstract

Certain aspects of the present disclosure provide techniques for reporting an indication of a PHR when the UE'"'"'s assigned of UL resources is insufficient to transmit both UL data and a PHR. Additionally, aspects described herein introduce a negative PHR used to indicate the UE requires additional UL resources.

Claims

1. A method for wireless communication by a user equipment (UE), comprising:

receiving an uplink (UL) grant assigning resources for UL transmissions from the UE to a next generation Node B (gNB);

determining the assigned resources are insufficient to transmit UL data and a power headroom report (PHR) for a cell associated with the UL grant; and

based, at least in part, on the determination, taking one or more actions to transmit the UL data and convey an indication of the PHR to the gNB.

2. The method of claim 1, wherein conveying the indication of the PHR comprises:

refraining to transmit the PHR, wherein the refraining indicates a PHR corresponding to zero for the cell.

3. The method of claim 1, wherein conveying the indication of the PHR comprises:

transmitting the indication in a subheader portion of a media access control (MAC) control element (CE), wherein the MAC CE does not include a payload.

4. The method of claim 1, wherein conveying the indication of the PHR comprises:

transmitting the PHR for the cell using a single entry PHR format.

5. The method of claim 1, wherein:

conveying the indication of the PHR comprises transmitting the PHR for the cell using a multi-entry PHR format, wherein the multi-entry PHR format conveys an indication of the PHR for the cell and a PHR associated with, at least, a secondary cell, and

transmitting the PHR comprises transmitting the PHR using a multi-entry PHR format.

6. The method of claim 5, wherein the multi-entry PHR format comprises:

one bit associated with each of the cell and the secondary cell, wherein the one bit indicates one of a PHR of 0 associated with a respective cell or an insufficient UL grant associated with the respective cell.

7. The method of claim 1, wherein conveying the indication of the PHR comprises:

transmitting an indication that the UL grant is insufficient to transmit the UL data and the PHR;

in response to the indication, receiving an additional UL grant assigning additional resources for the UL transmissions to the gNB; and

transmitting the PHR based, at least in part, on the additional UL grant.

8. The method of claim 7, wherein the indication that the UL grant is insufficient is transmitted in a reserved bit of a header of a media access control (MAC) sub-packet data unit (PDU).

9. The method of claim 1, wherein taking the one or more actions comprises:

conveying an indication the UL grant is insufficient to transmit the UL data and the PHR for the cell;

in response to the indication, receiving, from the gNB, an additional UL grant assigning additional resources for UL transmissions to the gNB, and

transmitting the PHR and the UL data based, at least in part on the additional UL grant.

10. The method of claim 1, wherein the UE is located at an edge of a coverage area provided by the gNB.

11. A method for wireless communication by a next generation Node B (gNB), comprising:

transmitting an uplink (UL) grant assigning resources to user equipment (UE) for UL transmissions to the gNB, wherein the assigned resources are insufficient for the UE to transmit UL data and a power headroom report (PHR) for a cell associated with the UL grant;

receiving, from the UE, the UL data and an indication of the PHR; and

taking one or more actions based, at least in part, on the received indication.

12. The method of claim 11, wherein receiving the indication of the PHR comprises:

determining the gNB did not receive the PHR as scheduled by the gNB or in response to a request by the gNB for the PHR; and

in response to the determination, determining the PHR for the cell corresponds to zero.

13. The method of claim 11, wherein receiving the indication of the PHR comprises:

receiving the indication in a subheader portion of a media access control (MAC) control element (CE), wherein the MAC CE does not include a payload.

14. The method of claim 11, wherein receiving the indication of the PHR comprises:

receiving the PHR for the cell using a single entry PHR format.

15. The method of claim 11, wherein receiving the indication of the PHR comprises:

receiving the indication of the PHR the cell using a multi-entry PHR format, wherein the multi-entry PHR format conveys an indication of the PHR for the cell and a PHR associated with, at least, a secondary cell.

16. The method of claim 15, wherein the multi-entry PHR format comprises:

one bit associated with each of the cell and the secondary cell, wherein the one bit indicates one of a PHR of 0 associated with a respective cell or an insufficient UL grant associated with the respective cell.

17. The method of claim 11, wherein receiving the indication of the PHR comprises:

receiving an indication that the UL grant is insufficient for the UE to transmit the UL data and the PHR for the cell;

in response to the indication, transmitting, to the UE, an additional UL grant assigning additional resources for UL transmissions to the gNB; and

receiving the PHR based, at least in part, on the additional UL grant.

18. The method of claim 17, wherein the indication that the UL grant is insufficient is received in a reserved bit of a header of a media access control (MAC) sub-packet data unit (PDU).

19. The method of claim 11, wherein:

receiving the indication comprises receiving an indication the UL grant is insufficient for the UE to transmit the UL data and the PHR for the cell, and

taking the one or more actions comprises transmitting, to the UE, an additional UL grant assigning additional resources for UL transmissions to the gNB, and

receiving the PHR and the UL data based, at least in part on the additional UL grant.

20. The method of claim 11, wherein the UE is located at a coverage edge provided by the gNB.

21. A method for wireless communication by a user equipment (UE), comprising:

receiving an uplink (UL) grant assigning resources for UL transmissions by to a next generation Node B (gNB);

determining the assigned resources are insufficient to transmit the UL transmissions; and

based, at least in part, on the determination, transmitting, to the gNB, a power headroom report (PHR) having a negative value.

22. The method of claim 21, wherein the negative value indicates the assigned resources are insufficient to transmit the UL transmissions.

23. The method of claim 21, wherein the UL transmissions comprise voice transmissions and a media access control (MAC) control element (CE).

24. The method of claim 21, wherein the UL transmissions comprise transmissions from multiple services multiplexed on a same data radio bearer (DRB).

25. The method of claim 21, wherein determining the assigned resources are insufficient comprises:

determining a codec rate for at least a portion of the UL transmissions has increased.

26. The method of claim 21, further comprising:

in response to transmitting the PHR having the negative value, receiving a second UL grant assigning additional UL resources for the UL transmissions.

27. A method for wireless communication by a next generation Node B (gNB), comprising:

transmitting, to a user equipment (UE), a first uplink (UL) grant assigning resources for UL transmissions;

based, at least in part on the UL grant, receiving from the UE a power headroom report (PHR) having a negative value; and

based on the negative value, transmitting, to the UE, a second UL grant assigning additional resources for the UL transmissions.

28. The method of claim 27, wherein the negative value indicates the assigned resources associated with the first UL grant are insufficient to transmit the UL transmissions.

29. The method of claim 27, further comprising:

determining based, at least in part on the negative value, an additional amount of UL resources needed by the UE to transmit the UL transmissions,

wherein the second UL grant is based, at least in part, on the determined additional amount.

30. The method of claim 27, wherein the UL transmissions comprises voice transmissions and a media access control (MAC) control element (CE).

31. The method of claim 27, wherein the UL transmissions comprise transmissions from multiple services multiplexed on a same data radio bearer (DRB).

32. The method of claim 27, wherein the PHR having the negative value indicates a codec rate for at least a portion of the UL transmissions has increased.