Method and apparatus for determining phase tracking reference signal pattern

A method, comprising:

• determining, by a terminal device, a first phase tracking reference signal (PTRS) pattern on one orthogonal frequency division multiplexing (OFDM) symbol in an OFDM signal based on a third scheduled bandwidth threshold, wherein the first PTRS pattern meets a second condition, the second condition is that a ratio of a total quantity of modulation symbols in the first PTRS pattern to a quantity of subcarriers in scheduled bandwidth is less than or equal to a first threshold, the first PTRS pattern comprises at least one PTRS group, and each PTRS group comprises at least one modulation symbol, wherein the total quantity of modulation symbols of the PTRS pattern is a product of a quantity of PTRS groups and a quantity of modulation symbols in a PTRS group, and the scheduled bandwidth is bandwidth allocated by a network device to the terminal device.

A method, comprising:

• determining, by a network device, a first phase tracking reference signal (PTRS) pattern on one orthogonal frequency division multiplexing (OFDM) symbol in an OFDM signal based on a third scheduled bandwidth threshold, wherein the first PTRS pattern meets a second condition, the second condition is that a ratio of a total quantity of modulation symbols in the first PTRS pattern to a quantity of subcarriers in scheduled bandwidth is less than or equal to a first threshold, the first PTRS pattern comprises at least one PTRS group, and each PTRS group comprises at least one modulation symbol, wherein
• the total quantity of modulation symbols of the first PTRS pattern is a product of a quantity of PTRS groups and a quantity of modulation symbols in a PTRS group, and the scheduled bandwidth is bandwidth allocated by the network device to a terminal device.