IP Library › Granted Patent US 11,973,541
Granted Patent B2
US 11,973,541 · App. 17/645,172 · Granted Apr 30, 2024

RRC indication to enable pathloss reference signal updates via MAC-CE

Inventors: Yan Zhou (San Diego, CA); Tao Luo (San Diego, CA)
Assignee: QUALCOMM Incorporated
H04B17/309H04L5/0048H04L5/0098H04W24/06H04W24/10H04W72/21H04W72/23H04W76/27
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Quick Facts
Patent No.
US 11,973,541
App. No.
17/645,172
Granted
Apr 30, 2024
Kind
B2
Abstract

A method, a computer-readable medium, and an apparatus are provided for wireless communication at a user equipment. The UE receives an indication from a base station that a medium access control-control element (MAC-CE) activation of a pathloss reference signal is enabled. The UE receives a MAC-CE activating the pathloss reference signal. The UE determines the pathloss reference signal based on the MAC-CE and the indication that indicates that the MAC-CE activation of the pathloss reference signal is enabled. Then, the UE estimates a downlink pathloss based on the pathloss reference signal that is activated by the MAC-CE.

Claims (59)

1. A method of wireless communication at a user equipment (UE), comprising:

receiving an indication in radio resource control (RRC) signaling, the indication indicating that a medium access control-control element (MAC-CE) based update of a pathloss reference signal is enabled;

receiving a MAC-CE updating the pathloss reference signal;

determining the pathloss reference signal based on the MAC-CE and the indication that indicates that the MAC-CE based update of the pathloss reference signal is enabled; and

estimating a downlink pathloss based on the pathloss reference signal that is updated by the MAC-CE.

2. The method of claim 1 , wherein the pathloss reference signal is for a sounding reference signal (SRS).

3. The method of claim 1 , wherein the pathloss reference signal is for a physical uplink shared channel (PUSCH).

4. The method of claim 3 , wherein the pathloss reference signal is for the PUSCH that is scheduled based on a downlink control information (DCI) format without a sounding reference signal resource indicator (SRI) field.

5. The method of claim 4 , wherein the pathloss reference signal is based on a default pathloss reference signal.

6. The method of claim 1 , wherein the indication comprises a single indication that enables the MAC-CE based update of the pathloss reference signal for a sounding reference signal (SRS) and a physical uplink shared channel (PUSCH).

7. The method of claim 1 , wherein the MAC-CE comprises a reference signal identifier (ID) for the pathloss reference signal that is updated by the MAC-CE.

8. The method of claim 1 , wherein the MAC-CE indicates a mapping between a pathloss reference signal identifier (ID) and a sounding reference signal resource indicator (SRI) for physical uplink shared channel power control.

9. The method of claim 1 , further comprising:

receiving a configuration of one or more pathloss reference signals for the UE in an RRC configuration, wherein the MAC-CE updates at least one of the one or more pathloss reference signals.

10. The method of claim 9 , wherein a number of the one or more pathloss reference signals configured for the UE in the RRC configuration exceeds 4 .

11. The method of claim 1 , further comprising:

determining a transmission power for an uplink signal based, at least in part, on the downlink pathloss.

12. An apparatus for wireless communication at a user equipment (UE), comprising:

memory; and

at least one processor coupled to the memory and configured to cause the UE to:

receive an indication in radio resource control (RRC) signaling, the indication indicating that a medium access control-control element (MAC-CE) based update of a pathloss reference signal is enabled;

receive a MAC-CE updating the pathloss reference signal;

determine the pathloss reference signal based on the MAC-CE and the indication that indicates that the MAC-CE based update of the pathloss reference signal is enabled; and

estimate a downlink pathloss based on the pathloss reference signal that is updated by the MAC-CE.

13. The apparatus of claim 12 , wherein the at least one processor is further configured to:

receive a configuration of one or more pathloss reference signals for the UE in an RRC configuration, wherein the MAC-CE updates at least one of the one or more pathloss reference signals.

14. The apparatus of claim 12 , wherein the pathloss reference signal is for a sounding reference signal (SRS).

15. The apparatus of claim 12 , wherein the pathloss reference signal is for a physical uplink shared channel (PUSCH).

16. The apparatus of claim 15 , wherein the pathloss reference signal is for the PUSCH that is scheduled based on a downlink control information (DCI) format without a sounding reference signal resource indicator (SRI) field.

17. The apparatus of claim 16 , wherein the pathloss reference signal is based on a default pathloss reference signal.

18. The apparatus of claim 12 , wherein the indication comprises a single indication that enables the MAC-CE based update of the pathloss reference signal for a sounding reference signal (SRS) and a physical uplink shared channel (PUSCH).

19. The apparatus of claim 12 , wherein the MAC-CE comprises a reference signal identifier (ID) for the pathloss reference signal that is updated by the MAC-CE.

20. The apparatus of claim 12 , wherein the MAC-CE indicates a mapping between a pathloss reference signal identifier (ID) and a sounding reference signal resource indicator (SRI) for physical uplink shared channel power control.

21. The apparatus of claim 12 , wherein the at least one processor is further configured to:

determine a transmission power for an uplink signal based, at least in part, on the downlink pathloss.

22. A method of wireless communication at a base station, comprising:

transmitting an indication in radio resource control (RRC) signaling to a user equipment (UE), the indication indicating that a medium access control-control element (MAC-CE) based update of a pathloss reference signal is enabled; and

transmitting a MAC-CE updating the pathloss reference signal based on the indication that the MAC-CE based update of the pathloss reference signal is enabled.

23. The method of claim 22 , wherein the pathloss reference signal is for a sounding reference signal (SRS).

24. The method of claim 22 , wherein the pathloss reference signal is for a physical uplink shared channel (PUSCH).

25. The method of claim 24 , wherein the pathloss reference signal is for the PUSCH that is scheduled based on a downlink control information (DCI) format without a sounding reference signal resource indicator (SRI) field.

26. The method of claim 22 , wherein the indication comprises a single indication that enables the MAC-CE based update of the pathloss reference signal for a sounding reference signal (SRS) and a physical uplink shared channel (PUSCH).

27. The method of claim 22 , wherein the MAC-CE comprises a reference signal identifier (ID) for the pathloss reference signal that is updated by the MAC-CE.

28. The method of claim 22 , wherein the MAC-CE indicates a mapping between a pathloss reference signal identifier (ID) and a sounding reference signal resource indicator (SRI) for physical uplink shared channel power control.

29. The method of claim 22 , further comprising:

configuring one or more pathloss reference signals for the UE in an RRC configuration, wherein the MAC-CE updates at least one of the one or more pathloss reference signals.

30. An apparatus for wireless communication at a base station, comprising:

memory; and

at least one processor coupled to the memory and, configured to:

transmit an indication in radio resource control (RRC) signaling to a user equipment (UE), the indication indicating that a medium access control-control element (MAC-CE) based update of a pathloss reference signal is enabled; and

transmit a MAC-CE updating the pathloss reference signal based on the indication that the MAC-CE based update of the pathloss reference signal is enabled.

31. The apparatus of claim 30 , wherein the pathloss reference signal is for a sounding reference signal (SRS).

32. The apparatus of claim 30 , wherein the pathloss reference signal is for a physical uplink shared channel (PUSCH).

33. The apparatus of claim 32 , wherein the pathloss reference signal is for the PUSCH that is scheduled based on a downlink control information (DCI) format without a sounding reference signal resource indicator (SRI) field.

34. The apparatus of claim 30 , wherein the indication comprises a single indication that enables the MAC-CE based update of the pathloss reference signal for a sounding reference signal (SRS) and a physical uplink shared channel (PUSCH).

35. The apparatus of claim 30 , wherein the MAC-CE comprises a reference signal identifier (ID) for the pathloss reference signal that is updated by the MAC-CE.

36. The apparatus of claim 30 , wherein the MAC-CE indicates a mapping between a pathloss reference signal identifier (ID) and a sounding reference signal resource indicator (SRI) for physical uplink shared channel power control.

37. The apparatus of claim 30 , wherein the at least one processor is further configured to:

configure one or more pathloss reference signals for the UE in an RRC configuration, wherein the MAC-CE updates at least one of the one or more pathloss reference signals.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 20, 2021
From: ZHOU, YAN; LUO, TAO
To: QUALCOMM INCORPORATED
Reel/Frame 058434/0018 →
Continuity (3)
Continuation 17082748 · Oct 28, 2020
Provisional Application 62938919 · Nov 21, 2019
Related Publication 20220116127A1 · Apr 14, 2022
Cited By (2)
US 12,452,796 US 12,464,536