Transmit power control method based on an uplink-downlink configuration, related device, and system
A transmit power control method includes obtaining an uplink-downlink configuration (uplink (UL)/downlink (DL) assignment) from a network side and determining a power decrease that can be reduced in the uplink-downlink configuration compared with that in an all-uplink configuration when and uplink time proportion configured in the uplink-downlink configuration is not 100% and the uplink-downlink configuration is not the all-uplink configuration.
1. A method implemented by a terminal, wherein the method comprises:
receiving, from a network device, first information indicating a first uplink-downlink configuration; and
performing uplink transmission on a plurality of uplink time resources indicated by the first uplink-downlink configuration,
wherein an actual transmit power for the uplink transmission is equal to a first difference between a first maximum transmit power of the terminal and an actual power decrease and meets a specific absorption rate (SAR) specification,
wherein the actual power decrease is based on a first power decrease and a first power increase and is less than the first power decrease,
wherein the first power increase is equal to a second difference between a second maximum transmit power in the first uplink-downlink configuration that meets the SAR specification and a third maximum transmit power in a second uplink-downlink configuration that meets the SAR specification,
wherein a first uplink time proportion in the first uplink-downlink configuration is less than a second uplink time proportion in the second uplink-downlink configuration, and
wherein the first power decreases a transmit power from the first maximum transmit power to a fourth maximum transmit power that meets the SAR specification when the terminal is at a first distance from a human body in the second uplink-downlink configuration.
2. The method of claim 1 , wherein the second uplink time proportion is 100%.
3. The method of claim 2 , wherein the first power decrease is equal to a third difference between the first maximum transmit power and a measured power, and wherein the measured power is a fifth maximum transmit power that meets the SAR specification and that is measured during performing continuous uplink transmission when the terminal is at the first distance.
4. The method of claim 1 , further comprising searching the first power decrease in a first mapping table based on the first distance, wherein the first mapping table comprises power decreases corresponding to a plurality of candidate distances, and wherein the candidate distances comprise the first distance.
5. The method of claim 1 , further comprising searching the first power increase in a second mapping table based on the first uplink time proportion, wherein the second mapping table comprises power increases corresponding to a plurality of candidate uplink time proportions, and wherein the candidate uplink time proportions comprise the first uplink time proportion.
6. The method of claim 1 , further comprising determining the first distance.
7. The method of claim 1 , wherein the actual power decrease is equal to a fourth difference between the first power decrease and the first power increase.
8. The method of claim 1 , wherein the first information is carried in one or more of a system information block (SIB), a Radio Resource Control (RRC) message, or a downlink control information (DCI) message.
9. The method of claim 1 , further comprising sending, to the network device, a capability report message carrying second information, wherein the second information indicates a maximum proportion of uplink time that can be scheduled in an evaluation periodicity of the SAR specification, and wherein the maximum proportion is greater than a first value.
10. The method of claim 9 , further comprising receiving, from the network device, an uplink grant, wherein a proportion of the uplink time resources configured by the uplink grant to the uplink time resources is greater than a second value.
11. A terminal comprising:
a memory configured to store instructions; and
a processor coupled to the memory, wherein the instructions cause the processor to be configured to:
receive, from a network device, first information indicating a first uplink-downlink configuration; and
perform uplink transmission on a plurality of uplink time resources indicated by the first uplink-downlink configuration,
wherein an actual transmit power for the uplink transmission is equal to a first difference of first maximum transmit power of the terminal and an actual power decrease and meets a specific absorption rate (SAR) specification,
wherein the actual power decrease is based on a first power decrease and a first power increase and is less than the first power decrease,
wherein the first power increase is equal to a second difference between a second maximum transmit power in the first uplink-downlink configuration that meets the SAR specification and a third maximum transmit power in a second uplink-downlink configuration that meets the SAR specification,
wherein a first uplink time proportion in the first uplink-downlink configuration is less than a second uplink time proportion in the second uplink-downlink configuration, and
wherein the first power decreases a transmit power from the first maximum transmit power to a fourth maximum transmit power that meets the SAR specification when the terminal is at a first distance from a human body in the second uplink-downlink configuration.
12. The terminal of claim 11 , wherein the second uplink time proportion is 100%.
13. The terminal of claim 12 , wherein the first power decrease is equal to a third difference between the first maximum transmit power and a measured power, and wherein the measured power is a fifth maximum transmit power that meets the SAR specification and that is measured during performing continuous uplink transmission when the terminal is at the first distance.
14. The terminal of claim 11 , wherein the instructions further cause the processor to be configured to search the first power decrease in a first mapping table based on the first distance, wherein the first mapping table comprises power decreases corresponding to a plurality of candidate distances, and wherein the candidate distances comprise the first distance.
15. The terminal of claim 11 , wherein the instructions further cause the processor to be configured to search the first power increase in a second mapping table based on the first uplink time proportion, wherein the second mapping table comprises power increases corresponding to a plurality of candidate uplink time proportions, and wherein the candidate uplink time proportions comprise the first uplink time proportion.
16. The terminal of claim 11 , wherein the instructions further cause the processor to be configured to determine the first distance.
17. The terminal of claim 11 , wherein the actual power decrease is equal to a fourth difference between the first power decrease and the first power increase.
18. The terminal of claim 11 , wherein the first information is carried in one or more of a system information block (SIB), a Radio Resource Control (RRC) message, or a downlink control information (DCI) message.
19. The terminal of claim 11 , wherein the instructions further cause the processor to be configured to send, to the network device, a capability report message carrying second information, wherein the second information indicates a maximum proportion of uplink time that can be scheduled in an evaluation periodicity of the SAR specification, and wherein the maximum proportion is greater than a first value.
20. The terminal of claim 11 , wherein the instructions further cause the processor to be configured to receive, from the network device, an uplink grant, wherein a proportion of the uplink time resources configured by the uplink grant to the uplink time resources is greater than a second value.