Power control method, terminal, and network side device
Embodiments of the present disclosure provide a power control method, a terminal, and a network side device thereof. The power control method may be applied to a terminal, and include obtaining a power control parameter, and controlling retransmission power of a data section in a message of a random access procedure based on the power control parameter.
1. A method of power control, performed by a terminal, the method comprising:
transmitting a message 1 of a 2-step random access channel (RACH) procedure to a network side device;
receiving an instruction from the network side device indicating that the network side device fails to obtain a data section of the message 1 ;
obtaining a power control parameter from the network side device;
retransmitting the message 1 to the network side device in response to the instruction; and
controlling retransmission power of the data section of the retransmitted message 1 based on the power control parameter, wherein the retransmitted message 1 comprises a non-data section comprising control information for assisting the retransmission of the data section,
wherein the power control parameter comprises a power ramping step, and when the retransmission power of the data section of the retransmitted message 1 is less than a specified maximum retransmission power, the retransmission power of the data section of the retransmitted message 1 is positively correlated with a retransmission sequence number of the data section in the message 1 .
2. The method according to claim 1 , wherein the power control parameter further comprises a power adjustment value.
3. The method according to claim 2 , wherein obtaining the power control parameter comprises:
receiving a message 2 sent by the network side device, wherein the message 2 comprises a transmit power control (TPC) command that indicates the power adjustment value.
4. The method according to claim 2 , wherein:
controlling the retransmission power of the data section of the retransmitted message 1 based on the power control parameter comprises:
when the power ramping step and the power adjustment value are obtained, controlling the retransmission power of the data section of the retransmitted message 1 based on the power adjustment value;
when the power ramping step and the power adjustment value are obtained, controlling the retransmission power of the data section of the retransmitted message 1 based on the power ramping step; or
when the power ramping step and the power adjustment value are obtained, controlling the retransmission power of the data section of the retransmitted message 1 based on the power adjustment value and the power ramping step.
5. The method according to claim 1 , wherein controlling the retransmission power of the data section of the retransmitted message 1 based on the power control parameter comprises:
determining an amount of power ramping, wherein the amount of power ramping is equal to a product of N and the power ramping step, and N is a sum of an actual number of retransmissions of the data section in the message 1 and 1 ; and
controlling the retransmission power of the data section of the retransmitted message 1 based on the amount of power ramping.
6. A method of power control, performed by a network side device, the method comprising:
after failing to obtain a data section of a message 1 of a 2-step random access channel (RACH) procedure from a terminal, instructing the terminal to retransmit the message 1 to the network side device; and
sending a power control parameter to the terminal, wherein the power control parameter is used to control retransmission power of the data section of the message 1 , wherein the message 1 comprises a non-data section comprising control information for assisting the retransmission of the data section,
wherein the power control parameter comprises a power ramping step, and when the retransmission power of the data section of the retransmitted message 1 is less than a specified maximum retransmission power, the retransmission power of the data section of the retransmitted message 1 is positively correlated with a retransmission sequence number of the data section in the message 1 .
7. The method according to claim 6 , wherein the power control parameter further comprises a power adjustment value.
8. The method according to claim 7 , wherein sending the power control parameter to the terminal comprises:
sending a message 2 to the terminal, wherein the message 2 carries a TPC command that comprises the power adjustment value.
9. A terminal, comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements operations comprising:
transmitting a message 1 of a 2-step random access channel (RACH) procedure to a network side device;
receiving an instruction from the network side device indicating that the network side device fails to obtain a data section of the message 1 ;
obtaining a power control parameter from the network side device;
retransmitting the message 1 to the network side device in response to the instruction; and
controlling retransmission power of the data section of the retransmitted message 1 based on the power control parameter, wherein the retransmitted message 1 comprises a non-data section comprising control information for assisting the retransmission of the data section,
wherein the power control parameter comprises a power ramping step, and when the retransmission power of the data section of the retransmitted message 1 is less than a specified maximum retransmission power, the retransmission power of the data section of the retransmitted message 1 is positively correlated with a retransmission sequence number of the data section in the message 1 .
10. The terminal according to claim 9 , wherein the power control parameter further comprises a power adjustment value.
11. The terminal according to claim 10 , wherein obtaining the power control parameter comprises:
receiving a message 2 sent by the network side device, wherein the message 2 comprises a transmit power control (TPC) command that indicates the power adjustment value.
12. The terminal according to claim 10 , wherein:
controlling the retransmission power of the data section of the retransmitted message 1 based on the power control parameter comprises:
when the power ramping step and the power adjustment value are obtained, controlling the retransmission power of the data section of the retransmitted message 1 based on the power adjustment value;
when the power ramping step and the power adjustment value are obtained, controlling the retransmission power of the data section of the retransmitted message 1 based on the power ramping step; or
when the power ramping step and the power adjustment value are obtained, controlling the retransmission power of the data section of the retransmitted message 1 based on the power adjustment value and the power ramping step.
13. The terminal according to claim 9 , wherein controlling the retransmission power of the data section of the retransmitted message 1 based on the power control parameter comprises:
determining an amount of power ramping, wherein the amount of power ramping is equal to a product of N and the power ramping step, and N is a sum of an actual number of retransmissions of the data section in the message 1 and 1 ; and
controlling the retransmission power of the data section of the retransmitted message 1 based on the amount of power ramping.