Fuente: Wipo "IOT" The present invention relates to the technical field of communications, and provides a communication method based on an ambient Internet of Things (A-IoT), a terminal, a network device, and a communication system. The method comprises: acquiring first information, and on the basis of the first information, acquiring priority parameters related to an A-IoT terminal; and on the basis of the priority parameters related to the A-IoT terminal, determining a priority related to the A-IoT terminal. By means of the technical solution of the present invention, priorities related to A-IoT terminals, such as the priority of the A-IoT terminal and the priority of at least one sub-channel for transmission by the A-IoT terminal, can be determined, such that a high-priority A-IoT terminal can gain an advantage in the entire scheduling, or a specific resource can be allocated for the high-priority A-IoT terminal, thereby meeting more service requirements.