Phase tracking reference signal sending method and apparatus

A phase tracking reference signal (PTRS) sending method, comprising:

• obtaining, by a terminal device, uplink grant information that comprises at least one transmission precoding matrix indicator (TPMI);
• determining, by the terminal device based on uplink grant information and a preset rule, an antenna port associated with a to-be-sent PTRS for each of the at least one TPMI, wherein the antenna port associated with the to-be-sent PTRS is selected from an antenna port set and the to-be-sent PTRS is one or more of all available PTRSs, the preset rule comprises each column of a precoding codeword corresponding to one of the at least one TPMI and each antenna port in the antenna port set corresponding to the one of the at least one TPMI are in a one-to-one correspondence, and antenna ports in the antenna port set that correspond to columns in which non-zero elements in a same row of the precoding codeword are located correspond to a same to-be-sent PTRS;
• and
• sending, by the terminal device, the at least one to-be-sent PTRS on the at least one antenna port corresponding to the at least one TPMI,.