Abstract: A data transmission method includes obtaining a first data packet generated by a first application running on a user equipment; using the first data packet as a to-be-transmitted data packet on a first logical channel (LC) when the first data packet carries a first identifier indicating that the first data packet needs to be sent on an air interface according to a first transmission quality requirement; sending, to a base station, a first buffer status report (BSR) that includes indication information of the first transmission quality requirement for allocating a first air interface resource to the first LC according to the first transmission quality requirement; and sending, to the base station, the to-be-transmitted data packet on the first LC using the first air interface resource.