Power control method for transmitting uplink channel

1. A terminal comprising:

a transceiver configured to receive at least one piece of downlink control information (DCI) from at least one network device, wherein the at least one piece of DCI comprises at least two transmit power control commands; and

a processor configured to:

determine a transmit power on an uplink channel in a same carrier based on the at least two transmit power control commands, wherein the transmit power on the uplink channel is determined based on an adjustment step or an absolute power adjustment value indicated by each transmit power control command and a propagation loss corresponding to the uplink channel of the at least one network device including: separately determining at least two candidate transmit powers based on the at least two transmit power control commands, wherein the at least two candidate transmit powers are in a one-to-one correspondence with the at least two transmit power control commands; and determining the transmit power on the uplink channel based on the at least two candidate transmit powers.

2. The terminal according to claim 1 , wherein the transceiver is configured to:

receive DCI from a first network device, wherein the DCI from the first network device comprises the at least two transmit power control commands of the terminal, and the first network device incudes any one of the at least one network devices.

3. The terminal according to claim 2 , wherein the at least two transmit power control commands occupy n bits, n being a positive integer greater than 2, and a correspondence between the n bits and the at least two transmit power control commands configured by using higher layer signaling or being predefined.

4. The terminal according to claim 1 , wherein the processor is configured to:

determine, as the transmit power on the uplink channel, a maximum transmit power or a minimum transmit power in the at least two candidate transmit powers, or an average value of the at least two candidate transmit powers.

5. The terminal according to claim 1 , wherein the processor is configured to:

determine the transmit power on the uplink channel based on a first transmit power control command in the at least two transmit power control commands.

6. A terminal comprising:

a transceiver configured to receive downlink control information (DCI) from a first network device, wherein the DCI comprises at least two transmit power control commands of the terminal; and

a processor configured to determine a transmit power on an uplink channel of each of at least two network devices based on the at least two transmit power control commands, wherein the at least two network devices are in a one-to-one correspondence with the at least two transmit power control commands, and the at least two network devices include the first network device, wherein the transmit power on the uplink channel of each network device is determined based on an adjustment step or an absolute power adjustment value indicated by each transmit power control command, and wherein the transmit power on the uplink channel of each network device is determined based on the adjustment step indicated by each transmit power control command and a propagation loss corresponding to the uplink channel of each network device or based on the absolute power adjustment value indicated by each transmit power control command and a propagation loss corresponding to the uplink channel of each network device.

7. The terminal according to claim 6 , wherein the at least two transmit power control commands occupy n bits, n being a positive integer greater than 2, and a correspondence between the n bits and the at least two transmit power control commands configured by using higher layer signaling or being predefined.

8. The terminal according to claim 7 , wherein the processor is configured to:

determine an i th candidate transmit power P 1i in at least two candidate transmit powers based on an i th transmit power control command in the at least two transmit power control commands, wherein the at least two transmit power control commands are in a one-to-one correspondence with the at least two candidate transmit powers; a value of i is obtained through traversing in a range of 1 to N, and i is a positive integer; N is a quantity of the at least two uplink channels, and N is a positive integer greater than 1; and P 1i >0; and

when P 11 +P 12 + . . . +P 1N ≥P 0 , determine that a transmit power on an uplink channel of an i th network device in the at least two network devices is P 1i ; or

when P 11 +P 12 + . . . +P 1N >P 0 , determine a transmit power P 2i on an i th uplink channel according to one of the following formulas:

a 0 *(P 11 +P 12 + . . . +P 1N )≤P 0 , and P 2i =a 0 *P 1i ; or

a 1 *P 11 +a 2 *P 12 + . . . +a N *P 1N ≤P 0 , and P 2i =a i *P 1i , wherein

P 2i >0, P 0 is a maximum transmit power of the terminal, and a 0 and a i are scaling factors, 0>a 0 >1, and a i ≥0.

9. The terminal according to claim 8 , wherein the scaling factor a i is determined based on a priority of the uplink channel of the i th network device.

10. The terminal according to claim 6 , wherein the propagation loss corresponding to the uplink channel of each network device is indicated by using indication information in the DCI or higher layer signaling.

11. A method for power control comprising:

receiving, by a terminal, at least one piece of downlink control information (DCI) from at least one network device, wherein the at least one piece of DCI comprises at least two transmit power control commands; and

determining, by the terminal, a transmit power on an uplink channel in a same carrier based on the at least two transmit power control commands, wherein the transmit power on the uplink channel is determined based on an adjustment step or an absolute power adjustment value indicated by each transmit power control command and a propagation loss corresponding to the uplink channel of the at least one network device including: separately determining at least two candidate transmit powers based on the at least two transmit power control commands, wherein the at least two candidate transmit powers are in a one-to-one correspondence with the at least two transmit power control commands; and determining the transmit power on the uplink channel based on the at least two candidate transmit powers.

12. The method according to claim 11 , wherein the receiving at least one piece of DCI from at least one network device comprises:

receiving DCI from a first network device, wherein the DCI from the first network device comprises the at least two transmit power control commands of the terminal, and the first network device includes any one of the at least one network device.

13. The method according to claim 12 , wherein the at least two transmit power control commands occupy n bits, n being a positive integer greater than 2, and a correspondence between the n bits and the at least two transmit power control commands configured by using higher layer signaling or being predefined.

14. The method according to claim 11 , wherein the determining the transmit power on the uplink channel based on the at least two candidate transmit powers comprises:

determining, as the transmit power on the uplink channel, a maximum transmit power or a minimum transmit power in the at least two candidate transmit powers, or an average value of the at least two candidate transmit powers.