Uplink power control prioritization in dual connectivity
Methods, systems, and devices for wireless communication are described. Generally, the described techniques provide for efficiently performing dynamic power control with minimal complexity in a dual connectivity mode. In particular, a user equipment (UE) may determine the reserved power (or maximum available power) for uplink transmissions on one or more cells in one cell group to a base station based on the total power available to the UE and the minimum reserved power for uplink transmissions on one or more cells in another cell group. Once the UE determines the reserved power for conflicting uplink transmissions on one or more cells in a cell group, the UE may allocate the reserved power to each uplink transmission on the one or more cells in the cell group (e.g., based on a priority of each of the uplink transmissions).
1. A method for wireless communication at a user equipment (UE), comprising:
identifying that the UE is operating in dual connectivity with a master cell group and a secondary cell group;
determining a secondary cell group transmission power for allocation across component carriers of the secondary cell group during a transmission occasion based at least in part on a secondary cell group reserved transmission power for transmissions from the UE to the secondary cell group during the transmission occasion;
determining a master cell group reserved transmission power for allocation across component carriers of the master cell group during the transmission occasion;
allocating the master cell group reserved transmission power to the master cell group and the secondary cell group transmission power to the secondary cell group, wherein the allocation of the master cell group reserved transmission power is independent from the allocation of the secondary cell group transmission power;
allocating, within the master cell group, the master cell group reserved transmission power between a first plurality of scheduled transmissions to the master cell group during the transmission occasion;
allocating, within the secondary cell group, the secondary cell group transmission power between a second plurality of scheduled transmissions to the secondary cell group during the transmission occasion; and
communicating with the master cell group and with the secondary cell group during the transmission occasion in accordance with the allocating.
2. The method of claim 1 , wherein determining the master cell group reserved transmission power is based at least in part on a channel type priority that comprises at least one of a non-ultra-reliable low-latency communication with the master cell group or an ultra-reliable low-latency communication with the master cell group.
3. The method of claim 1 , further comprising:
identifying the secondary cell group reserved transmission power for the second plurality of scheduled transmissions from the UE to the secondary cell group, wherein determining the secondary cell group transmission power is based at least in part on identifying the secondary cell group reserved transmission power.
4. The method of claim 1 , wherein determining the master cell group reserved transmission power comprises:
determining that a master cell group total scheduled transmission power is less than or equal to a difference between a total available transmission power and the secondary cell group reserved transmission power; and
setting the master cell group reserved transmission power equal to the master cell group total scheduled transmission power based at least in part on the master cell group total scheduled transmission power being less than or equal to the difference.
5. The method of claim 1 , wherein determining the master cell group reserved transmission power comprises:
determining that a master cell group total scheduled transmission power is greater than a difference between a total available transmission power and the secondary cell group reserved transmission power;
determining that at least one transmission of the second plurality of scheduled transmissions is scheduled to the secondary cell group during the transmission occasion;
determining that a secondary cell group total scheduled transmission power is less than the secondary cell group reserved transmission power; and
setting the master cell group reserved transmission power equal to a difference between the total available transmission power and the secondary cell group total scheduled transmission power.
6. The method of claim 1 , wherein determining the master cell group reserved transmission power comprises:
determining that a master cell group total scheduled transmission power is greater than a difference between a total available transmission power and the secondary cell group reserved transmission power;
determining that at least one transmission of the second plurality of scheduled transmissions is scheduled to the secondary cell group during the transmission occasion;
determining that a secondary cell group total scheduled transmission power is greater than or equal to the secondary cell group reserved transmission power; and
setting the master cell group reserved transmission power equal to a difference between the total available transmission power and the secondary cell group reserved transmission power.
7. The method of claim 1 , further comprising:
identifying a master cell group reserved transmission power for the first plurality of scheduled transmissions from the UE to the master cell group, wherein determining the master cell group reserved transmission power is based at least in part on identifying the master cell group reserved transmission power.
8. The method of claim 1 , wherein allocating the master cell group reserved transmission power between the first plurality of scheduled transmissions to the master cell group during the transmission occasion comprises:
allocating the master cell group reserved transmission power between the first plurality of scheduled transmissions to the master cell group based at least in part on a priority of each scheduled transmission of the first plurality of scheduled transmissions.
9. The method of claim 1 , wherein allocating the secondary cell group transmission power between the second plurality of scheduled transmissions to the secondary cell group during the transmission occasion comprises:
allocating the secondary cell group transmission power between the second plurality of scheduled transmissions to the secondary cell group based at least in part on a priority of each scheduled transmission of the second plurality of scheduled transmissions.
10. The method of claim 1 , wherein the first plurality of scheduled transmissions to the master cell group include ultra-reliable low-latency communications, and wherein the second plurality of scheduled transmissions to the secondary cell group do not include ultra-reliable low-latency communications.
11. The method of claim 1 , further comprising:
identifying the secondary cell group reserved transmission power for the second plurality of scheduled transmissions from the UE to the secondary cell group during the transmission occasion;
determining a secondary cell group ultra-reliable low-latency communications total scheduled transmission power during the transmission occasion; and
determining that a master cell group total scheduled transmission power is less than or equal to a difference between a total available transmission power and the secondary cell group reserved transmission power.
12. The method of claim 11 , wherein determining the secondary cell group transmission power comprises:
scaling down a power of non-ultra-reliable low-latency communications with the secondary cell group during the transmission occasion;
determining that a sum of the scaled down power of the non-ultra-reliable low-latency communications with the secondary cell group and the secondary cell group ultra-reliable low-latency communications total scheduled transmission power is less than or equal to the secondary cell group reserved transmission power; and
setting the secondary cell group transmission power to be equal to the secondary cell group reserved transmission power.
13. The method of claim 1 , further comprising:
identifying a master cell group reserved transmission power for non-ultra-reliable low-latency communications for non-ultra-reliable low-latency transmissions from the UE to the master cell group during the transmission occasion;
identifying a master cell group reserved transmission power for ultra-reliable low-latency communications for ultra-reliable low-latency transmissions from the UE to the master cell group during the transmission occasion;
identifying the secondary cell group reserved transmission power for non-ultra-reliable low-latency communications for non-ultra-reliable low-latency transmissions from the UE to the secondary cell group during the transmission occasion; and
identifying a secondary cell group reserved transmission power for ultra-reliable low-latency communications for ultra-reliable low-latency transmissions from the UE to the secondary cell group during the transmission occasion.
14. The method of claim 13 , wherein the master cell group reserved transmission power for non-ultra-reliable low-latency communications is independent from the master cell group reserved transmission power for ultra-reliable low-latency communications, and wherein the secondary cell group reserved transmission power for non-ultra-reliable low-latency communications is independent from the secondary cell group reserved transmission power for ultra-reliable low-latency communications.
15. The method of claim 1 , further comprising:
identifying that the UE is power-limited.
16. The method of claim 1 , further comprising:
identifying that communications with the master cell group have a higher priority than communications with the secondary cell group.
17. The method of claim 1 , wherein the secondary cell group transmission power is based at least in part on the master cell group reserved transmission power.
18. The method of claim 1 , wherein operating in dual connectivity comprises performing dynamic power control in a dual connectivity mode.
19. The method of claim 1 , wherein determining the secondary cell group transmission power comprises determining that a transmission on the secondary cell group overlaps with a transmission on the master cell group in at least one symbol.
20. The method of claim 1 , wherein determining the secondary cell group transmission power comprises determining that the secondary cell group transmission power is less than or equal to the difference between a total transmit power available for uplink transmissions and the master cell group reserved transmission power.
21. An apparatus for wireless communication at a user equipment (UE), comprising:
a processor,
memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
identify that the UE is operating in dual connectivity with a master cell group and a secondary cell group;
determine a secondary cell group transmission power for allocation across component carriers of the secondary cell group during a transmission occasion based at least in part on a secondary cell group reserved transmission power for transmissions from the UE to the secondary cell group during the transmission occasion;
determine a master cell group reserved transmission power for allocation across component carriers of the master cell group during the transmission occasion based at least in part on the secondary cell group transmission power;
allocate the master cell group reserved transmission power to the master cell group and the secondary cell group transmission power to the secondary cell group, wherein the allocation of the master cell group reserved transmission power is independent from the allocation of the secondary cell group transmission power;
allocate, within the master cell group, the master cell group reserved transmission power between a first plurality of scheduled transmissions to the master cell group during the transmission occasion;
allocate, within the secondary cell group, the secondary cell group transmission power between a second plurality of scheduled transmissions to the secondary cell group during the transmission occasion; and
communicate with the master cell group and with the secondary cell group during the transmission occasion in accordance with the allocating.
22. The apparatus of claim 21 , wherein the instructions are further executable by the processor to cause the apparatus to:
identify the secondary cell group reserved transmission power for the second plurality of scheduled transmissions from the UE to the secondary cell group, wherein the secondary cell group transmission power is based at least in part on the identified secondary cell group reserved transmission power.
23. The apparatus of claim 21 , wherein the instructions to determine the master cell group reserved transmission power are executable by the processor to cause the apparatus to:
determine that a master cell group total scheduled transmission power is less than or equal to a difference between a total available transmission power and the secondary cell group reserved transmission power; and
set the master cell group reserved transmission power equal to the master cell group total scheduled transmission power based at least in part on the master cell group total scheduled transmission power being less than or equal to the difference.
24. The apparatus of claim 21 , wherein the instructions to determine the master cell group reserved transmission power are executable by the processor to cause the apparatus to:
determine that a master cell group total scheduled transmission power is greater than a difference between a total available transmission power and the secondary cell group reserved transmission power;
determine that at least one transmission of the second plurality of scheduled transmissions is scheduled to the secondary cell group during the transmission occasion;
determine that a secondary cell group total scheduled transmission power is less than the secondary cell group reserved transmission power; and
set the master cell group reserved transmission power equal to a difference between the total available transmission power and the secondary cell group total scheduled transmission power.
25. An apparatus for wireless communication at a user equipment (UE), comprising:
means for identifying that the UE is operating in dual connectivity with a master cell group and a secondary cell group;
means for determining a secondary cell group transmission power for allocation across component carriers of the secondary cell group during a transmission occasion based at least in part on a secondary cell group reserved transmission power for transmissions from the UE to the secondary cell group during the transmission occasion;
means for determining a master cell group reserved transmission power for allocation across component carriers of the master cell group during the transmission occasion based at least in part on the secondary cell group transmission power;
means for allocating the master cell group reserved transmission power to the master cell group and the secondary cell group transmission power to the secondary cell group, wherein the allocation of the master cell group reserved transmission power is independent from the allocation of the secondary cell group transmission power;
means for allocating, within the master cell group, the master cell group reserved transmission power between a first plurality of scheduled transmissions to the master cell group during the transmission occasion;
means for allocating, within the secondary cell group, the secondary cell group transmission power between a second plurality of scheduled transmissions to the secondary cell group during the transmission occasion; and
means for communicating with the master cell group and with the secondary cell group during the transmission occasion in accordance with the allocating.
26. A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to:
identify that the UE is operating in dual connectivity with a master cell group and a secondary cell group;
determine a secondary cell group transmission power for allocation across component carriers of the secondary cell group during a transmission occasion based at least in part on a secondary cell group reserved transmission power for transmissions from the UE to the secondary cell group during the transmission occasion;
determine a master cell group reserved transmission power for allocation across component carriers of the master cell group during the transmission occasion based at least in part on the secondary cell group transmission power;
allocate the master cell group reserved transmission power to the master cell group and the secondary cell group transmission power to the secondary cell group, wherein the allocation of the master cell group reserved transmission power is independent from the allocation of the secondary cell group transmission power;
allocate, within the master cell group, the master cell group reserved transmission power between a first plurality of scheduled transmissions to the master cell group during the transmission occasion;
allocate, within the secondary cell group, the secondary cell group transmission power between a second plurality of scheduled transmissions to the secondary cell group during the transmission occasion; and
communicate with the master cell group and with the secondary cell group during the transmission occasion in accordance with the allocating.
27. The apparatus of claim 21 , wherein the secondary cell group transmission power is based at least in part on the master cell group reserved transmission power.
28. The apparatus of claim 21 , wherein the secondary cell group reserved transmission power is based at least in part on a maximum transmission power for dual connectivity operation.
29. The apparatus of claim 21 , wherein the instructions are further executable by the processor to cause the apparatus to:
determine that a symbol of a first transmission on the secondary cell group overlaps with a second transmission on the master cell group during the transmission occasion.
30. The apparatus of claim 21 , wherein the instructions are further executable by the processor to cause the apparatus to:
determine that the secondary cell group transmission power is less than or equal to the difference between a total transmit power available for uplink transmissions and the master cell group reserved transmission power.