Data transmission and link quality detection method, communication device and storage medium

The invention discloses a data transmission and link quality detection method, a communication device and a storage medium, and relates to the field of communication. The data transmission method comprises the following steps: a first user plane function receives data from a first terminal, wherein the data is data sent to a second terminal; and the first user plane function sends the data to a second user plane function through the first QoS flow, and the second user plane function is a user plane function corresponding to the second terminal. In the data transmission method, data transmission is carried out between a first user plane function and a second user plane function through a first QoS flow, data transmission can also be carried out between a first terminal and the first user plane function and between a second terminal and the second user plane function based on the QoS flow, and the whole transmission path from the first terminal to the second terminal is not limited by the QoS flow. Reliable QoS guarantee can be provided for the data sent to the second terminal by the first terminal.