DATA TRANSMISSION METHOD AND APPARATUS

This application provides a data transmission method and an apparatus, and relates to the field of communication technologies. According to the method, a first network device sends a first message including first information to a remote terminal device. The first message indicates the remote terminal device to switch from being connected to the first network device through a first path to being connected to a second network device through a second path. The first path includes at least one relay terminal device. The second path includes at least one relay terminal device or does not include a relay terminal device. The first information indicates a receiving status of a first PDCP entity of the first network device. The first information is carried in a switch command, so that the remote terminal device can receive the first information as soon as possible, to avoid or reduce packet loss when data is transmitted on the second path based on the first information.