Power control method and terminal device

1. A method, comprising:

receiving, by a terminal device, configuration information from a base station, wherein the configuration information comprises an uplink power control parameter;

estimating, by the terminal device, according to the uplink power control parameter, a transmit power that is on an uplink shared channel and that is of a beam set in which the terminal device is located, wherein the beam set comprises n beams, and n is a positive integer greater than or equal to 1;

calculating, by the terminal device, according to a maximum transmit power of the terminal device and the transmit power that is on the uplink shared channel and that corresponds to the beam set in which the terminal device is located, a power headroom of the beam set in which the terminal device is located; and

generating, by the terminal device, a power headroom report according to the power headroom of the beam set in which the terminal device is located, and sending the power headroom report to the base station.

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

estimating, by the terminal device, according to the uplink power control parameter, a transmit power that is on a physical uplink control channel and that corresponds to the beam set in which the terminal device is located.

3. The method according to claim 2 , wherein when it is determined that the terminal device sends the uplink shared channel and the physical uplink control channel to the base station at the same time, the method further comprises:

calculating, by the terminal device, according to the maximum transmit power of the terminal device, the transmit power that is on the uplink shared channel and that corresponds to the beam set in which the terminal device is located, and the transmit power that is on the physical uplink control channel and that corresponds to the beam set in which the terminal device is located, the power headroom of the beam set in which the terminal device is located.

4. The method according to claim 1 , wherein before the sending the power headroom report to the base station, the method further comprises: triggering the power headroom report.

5. The method according to claim 4 , wherein the configuration information further comprises parameter information corresponding to a condition of triggering a power headroom report, and before the triggering the power headroom report, the method further comprises:

determining, by the terminal device, according to the parameter information corresponding to the condition of triggering a power headroom report, whether at a current moment a terminal device side meets the condition of triggering a power headroom report, and triggering the power headroom report only when the terminal device side meets the condition of triggering a power headroom report, wherein

the parameter information corresponding to the condition of triggering a power headroom report comprises:

a trigger period of the power headroom report, a period of prohibiting triggering of the power headroom report, and a downlink path loss value.

6. The method according to claim 5 , wherein the condition of triggering a power headroom report comprises:

a current moment is a time corresponding to the period of triggering a power headroom report; or

a current moment falls outside the period of prohibiting triggering of a power headroom report, and at the current moment, a downlink path loss of any beam in the beam set is greater than a downlink path loss threshold; or

a current moment falls outside the period of prohibiting triggering of a power headroom report, and at the current moment, a downlink path loss corresponding to each of m beams is greater than a downlink path loss threshold, wherein the m beams are a subset of the beam set, m is a positive integer greater than or equal to 2 and less than or equal to n, and in this case, n is a positive integer greater than or equal to 2; or

a current moment falls outside the period of prohibiting triggering of a power headroom report, and at the current moment, an average value or a weighted average value of downlink path losses corresponding to beams in the beam set is greater than a downlink path loss threshold; or

a current moment falls outside the period of prohibiting triggering of a power headroom report, and at the current moment, a downlink path loss of a preset beam in the beam set is greater than a downlink path loss threshold.

7. The method according to claim 5 , wherein before the triggering the power headroom report, the method further comprises: estimating a downlink path loss corresponding to each beam in the beam set or estimating a downlink path loss corresponding to each group of beams of the k groups of beams.

8. The method according to claim 1 , wherein a manner of configuring the uplink power control parameter comprises at least one of the following:

using each beam in the beam set as a granularity;

using each group of beams of the k groups of beams as a granularity;

using a carrier as a granularity;

using a serving cell as a granularity; or

using a terminal device as a granularity.

9. An apparatus, comprising:

a processor; and

a non-transitory memory coupled to the processor for storing program instructions,

wherein the program instructions, when executed by the processor, cause the apparatus to:

receive configuration information from a base station, wherein the configuration information comprises an uplink power control parameter;

estimate, according to the uplink power control parameter, a transmit power that is on an uplink shared channel and that is of a beam set in which the terminal device is located, wherein the beam set comprises n beams, and n is a positive integer greater than or equal to 1;

calculate, according to a maximum transmit power of the terminal device and the transmit power that is on the uplink shared channel and that corresponds to the beam set in which the terminal device is located, a power headroom of the beam set in which the terminal device is located; and

generate a power headroom report according to the power headroom of the beam set in which the terminal device is located; and

send the power headroom report to the base station.

10. The apparatus according to claim 9 , wherein the program instructions further cause the apparatus to:

estimate, according to the uplink power control parameter, a transmit power that is on a physical uplink control channel and that corresponds to the beam set in which the terminal device is located.

11. The apparatus according to claim 10 , wherein the program instructions further cause the apparatus to:

determine whether the terminal device sends the uplink shared channel and the physical uplink control channel to the base station at the same time; and

when determining that the terminal device sends the uplink shared channel and the physical uplink control channel to the base station at the same time, calculate, according to the maximum transmit power of the terminal device, the transmit power that is on the uplink shared channel and that corresponds to the beam set in which the terminal device is located, and the transmit power that is on the physical uplink control channel and that corresponds to the beam set in which the terminal device is located, the power headroom of the beam set in which the terminal device is located.

12. The apparatus according to claim 9 , wherein the program instructions further cause the apparatus to:

trigger the power headroom report.

13. The apparatus according to claim 12 , wherein the configuration information further comprises parameter information corresponding to a condition of triggering a power headroom report, and the program instructions further cause the apparatus to:

determine, according to the parameter information corresponding to the condition of triggering a power headroom report, whether at a current moment a terminal device side meets the condition of triggering a power headroom report, and trigger the power headroom report only when the terminal device side meets the condition of triggering a power headroom report, wherein

the parameter information corresponding to the condition of triggering a power headroom report comprises:

a trigger period of the power headroom report, a period of prohibiting triggering of the power headroom report, and a downlink path loss value.

14. The apparatus according to claim 13 , wherein the condition of triggering a power headroom report comprises:

a current moment is a time corresponding to the period of triggering a power headroom report; or

a current moment falls outside the period of prohibiting triggering of a power headroom report, and at the current moment, a downlink path loss of any beam in the beam set is greater than a downlink path loss threshold; or

a current moment falls outside the period of prohibiting triggering of a power headroom report, and at the current moment, a downlink path loss corresponding to each of m beams is greater than a downlink path loss threshold, wherein the m beams are a subset of the beam set, m is a positive integer greater than or equal to 2 and less than or equal to n, and in this case, n is a positive integer greater than or equal to 2; or

a current moment falls outside the period of prohibiting triggering of a power headroom report, and at the current moment, an average value or a weighted average value of downlink path losses corresponding to beams in the beam set is greater than a downlink path loss threshold; or

a current moment falls outside the period of prohibiting triggering of a power headroom report, and at the current moment, a downlink path loss of a preset beam in the beam set is greater than a downlink path loss threshold.