Method and apparatus for PUSCH/PUCCH power scaling considering dual connectivity in power limited state

1. A method of controlling a transmit power of a user equipment (UE), comprising:

establishing a Radio Resource Control (RRC) connection with a master base station through a primary serving cell, the master base station being associated with a Master Cell Group (MCG) including one or more serving cells configurable for the UE;

establishing a connection with a secondary base station, the secondary base station being associated with a Secondary Cell Group (SCG) including one or more serving cells configurable for the UE; and

transmitting a first uplink channel through a serving cell of the MCG and a second uplink channel through a serving cell of the SCG, wherein a first transmit power for the first uplink channel and a second transmit power for the second uplink channel are allocated based on a priority, and the priority is determined based on whether Uplink Control Information (UCI) is included in at least one of the first uplink channel or the second uplink channel and based on a type of a cell group.

2. The method according to claim 1 , further comprising:

controlling a transmit power reduction for a lower-prioritized uplink channel from the first uplink channel and the second uplink channel.

3. The method according to claim 1 , further comprising:

receiving, at the UE, an RRC message through the primary serving cell, the RRC message comprising carrier aggregation (CA) configuration information, the CA configuration information comprising information of one or more secondary serving cells to be aggregated according to a CA configuration, and the one or more secondary serving cells being included in at least one of the MCG and the SCG.

4. The method according to claim 1 , wherein the first uplink channel and the second uplink channel are configured to be transmitted in subframe i; and

wherein the transmitting a first uplink channel through a serving cell of the MCG and a second uplink channel through a serving cell of the SCG, comprising:

determining whether total transmit power for uplink transmissions from the UE in the subframe i exceeds an output power threshold in the subframe i; and

determining to reduce a transmit power of at least one of the first uplink channel or the second uplink channel in response to a determination that the total transmit power exceeds the output power threshold in the subframe i.

5. The method according to claim 1 , wherein the priority is determined primarily based on the UCI and determined secondarily based on the type of the cell group, the type of the cell group comprises the MCG and the SCG, and

wherein an uplink channel transmitted through the MCG has a higher priority than an uplink channel transmitted through the SCG if a lower-prioritized uplink channel is not determined based on the UCI.

6. The method according to claim 1 , wherein

the first uplink channel has a lower priority than the second uplink channel in case that the UCI is not included in the first uplink channel and is included in the second uplink channel;

the second uplink channel has a lower priority than the first uplink channel in case that the UCI is not included in either the first uplink channel or the second uplink channel; or

the second uplink channel has a lower priority than the first uplink channel in case that the first uplink channel and the second uplink channel have a same priority based on a UCI criterion.

7. The method according to claim 1 , wherein the first and second uplink channels each comprise at least one of a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).

8. The method according to claim 1 , wherein an uplink channel including a Scheduling Request (SR) or a Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) has a higher priority than an uplink channel including Channel State Information (CSI).

9. The method according to claim 1 , wherein an uplink channel that comprises PUSCH with a HARQ-ACK or a CSI has a higher priority than a PUSCH without a HARQ-ACK or a CSI.

10. A system, comprises a master base station and a secondary base station, wherein

a Radio Resource Control (RRC) connection is established between the master base station and a user equipment (UE) through a primary serving cell, the master base station being associated with a Master Cell Group (MCG) including one or more serving cells configurable for the UE;

a connection is established between the secondary base station and the UE, the secondary base station being associated with a Secondary Cell Group (SCG) including one or more serving cells configurable for the UE;

the master base station is configured to receive a first uplink channel through a serving cell of the MCG; and

the secondary base station is configured to receive a second uplink channel through a serving cell of the SCG, wherein

a first transmit power for the first uplink channel and a second transmit power for the second uplink channel are allocated based on a priority, and the priority is determined based on whether Uplink Control Information (UCI) is included in at least one of the first uplink channel or the second uplink channel and based on a type of a cell group.

11. The system of claim 10 , wherein the master base station is further configured to send a radio resource control (RRC) message through the primary serving cell, the RRC message comprising carrier aggregation (CA) configuration information, the CA configuration information comprising information of one or more secondary serving cells to be aggregated according to a CA configuration, and the one or more secondary serving cells being included in at least one of the MCG and the SCG.

12. The system of claim 10 , wherein the first uplink channel and the second uplink channel are configured to be transmitted in subframe i;

the master base station is configured to determine an uplink channel to be received from the UE through a serving cell of the MCG in the subframe i, and the secondary base station is configured to determine an uplink channel to be received from the UE through a serving cell of the SCG in the subframe i.

13. The system of claim 10 , wherein the first uplink channel and the second uplink channel are configured to be transmitted in subframe i;

the master base station is configured to determine an output power threshold in the subframe i, which is associated with a transmit power reduction for at least one of the first uplink channel determined to be received through a serving cell of the MCG or the second uplink channel determined to be received through a serving cell of the SCG in the subframe i.

14. The system of claim 13

when total transmit power for uplink transmissions from the UE_in the subframe i exceeds the output power threshold in the subframe i, the system is configured to receive at least one uplink channel from the UE in the subframe i with reduced transmit power.

15. The system of claim 14 , wherein the output power threshold in the subframe i corresponds to {circumflex over (P)} CMAX (i), a linear value of a total configured maximum output power P CMAX configured for the UE in the subframe i.

16. An apparatus, comprising:

a non-transitory memory storage comprising instructions; and

one or more hardware processors in communication with the non-transitory memory storage, wherein the one or more hardware processors execute the instructions to cause a user equipment to perform operations comprising:

establishing a Radio Resource Control (RRC) connection with a master base station through a primary serving cell, the master base station being associated with a Master Cell Group (MCG) including one or more serving cells configurable for the UE;

establishing a connection with a secondary base station, the secondary base station being associated with a Secondary Cell Group (SCG) including one or more serving cells configurable for the UE; and

transmitting a first uplink channel through a serving cell of the MCG and a second uplink channel through a serving cell of the SCG, wherein a first transmit power for the first uplink channel and a second transmit power for the second uplink channel are allocated based on a priority, and the priority is determined based on whether Uplink Control Information (UCI) is included in at least one of the first uplink channel or the second uplink channel and based on a type of a cell group.

17. The apparatus according to claim 16 , wherein the operations further comprise:

controlling a transmit power reduction for a lower-prioritized uplink channel from the first uplink channel and the second uplink channel.

18. The apparatus according to claim 16 , wherein the first uplink channel and the second uplink channel are configured to be transmitted in subframe i; and

wherein the transmitting a first uplink channel through a serving cell of the MCG and a second uplink channel through a serving cell of the SCG, comprising:

determining whether total transmit power for uplink transmissions from the UE in the subframe i exceeds an output power threshold in the subframe i; and

determining to reduce a transmit power of at least one of the first uplink channel or the second uplink channel in response to a determination that the total transmit power exceeds the output power threshold in the subframe i.

19. The apparatus according to claim 16 , wherein the priority is determined primarily based on the UCI and determined secondarily based on the type of the cell group, the type of the cell group comprises the MCG and the SCG, and

wherein an uplink channel transmitted through the MCG has a higher priority than an uplink channel transmitted through the SCG if a lower-prioritized uplink channel is not determined based on the UCI.

20. The apparatus according to claim 16 , wherein

the first uplink channel has a lower priority than the second uplink channel in case that the UCI is not included in the first uplink channel and is included in the second uplink channel;

the second uplink channel has a lower priority than the first uplink channel in case that the UCI is not included in either the first uplink channel or the second uplink channel; or

the second uplink channel has a lower priority than the first uplink channel in case that the first uplink channel and the second uplink channel have a same priority based on a UCI criterion.

21. The apparatus according to claim 16 , wherein the first and second uplink channels each comprise at least one of a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).

22. The apparatus according to claim 16 , wherein an uplink channel including a Scheduling Request (SR) or a Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) has a higher priority than an uplink channel including Channel State Information (CSI).