Carrier frequency tracking method, signal transmission method, and related apparatus

A carrier frequency tracking method, comprising:

• receiving, by a terminal device, a first tracking reference signal from a first transmission reception apparatus of a single frequency network cell, said single frequency network cell consisting of a single logical cell having a same physical cell identifier (PCI) throughout the single logical cell;
• receiving, by the terminal device, a second tracking reference signal from a second transmission reception apparatus of the single frequency network cell, wherein the first tracking reference signal and the second tracking reference signal occupy different time-frequency resources;
• and
• performing, by the terminal device, carrier frequency tracking based on at least one of the first tracking reference signal and the second tracking reference signal;
• wherein performing, by the terminal device, the carrier frequency tracking based on at least one of the first tracking reference signal and the second tracking reference signal further comprises:
• determining, by the terminal device based on the first tracking reference signal and the second tracking reference signal, a first carrier frequency on which the carrier frequency tracking is to be performed;
• and
• performing carrier frequency tracking based on the first carrier frequency;
• wherein determining, by the terminal device based on the first tracking reference signal and the second tracking reference signal, the first carrier frequency on which the carrier frequency tracking is to be performed further comprises:
• determining, by the terminal device, a second carrier frequency corresponding to the first tracking reference signal;
• determining, by the terminal device, a third carrier frequency corresponding to the second tracking reference signal;
• and
• determining, by the terminal device, the first carrier frequency based on the second carrier frequency and the third carrier frequency;
• wherein determining, by the terminal device, the first carrier frequency based on the second carrier frequency and the third carrier frequency further comprises:
• when an absolute value of a difference between the second carrier frequency and the third carrier frequency is less than or equal to a frequency offset threshold, determining, by the terminal device, the first carrier frequency based on the second carrier frequency and the third carrier frequency.