A method for transmitting an Internet Protocol, IP, data packet, wherein the method comprises: obtaining, by an Access Point, AP, device, an IP data packet to be transmitted to a User Equipment, UE; determining, by the AP device, a Data Radio Bearer, DRB, corresponding to the IP data packet from type information of the IP data packet; and transmitting, by the AP device, the IP data packet to the UE over the DRB; wherein determining, by the AP device, the DRB corresponding to the IP data packet from type information of the IP data packet comprises: inquiring, by the AP device, about a DRB identifier corresponding to the type information of the IP data packet from a pre-maintained correspondence relationship between type information and a DRB identifier and determining the DRB corresponding to the IP data packet by the DRB identifier; characterized in that, wherein the AP device maintaining the correspondence relationship between type information and a DRB identifier comprises: obtaining, by the AP device, a correspondence relationship between type information and a DRB configuration; and when the UE is connected to the AP device, setting up, by the AP device, the DRB for the UE using the DRB configuration, determining a DRB identifier corresponding to the setup DRB and determining a correspondence relationship between a DRB configuration and a DRB identifier; and determining the correspondence relationship between type information and a DRB identifier from the correspondence relationship between type information and a DRB configuration and the correspondence relationship between a DRB configuration and a DRB identifier; and notifying the UE of the correspondence relationship between type information and a DRB identifier. obtaining, by an Access Point, AP, device, an IP data packet to be transmitted to a User Equipment, UE; determining, by the AP device, a Data Radio Bearer, DRB, corresponding to the IP data packet from type information of the IP data packet; and transmitting, by the AP device, the IP data packet to the UE over the DRB; wherein determining, by the AP device, the DRB corresponding to the IP data packet from type information of the IP data packet comprises: inquiring, by the AP device, about a DRB identifier corresponding to the type information of the IP data packet from a pre-maintained correspondence relationship between type information and a DRB identifier and determining the DRB corresponding to the IP data packet by the DRB identifier; characterized in that, wherein the AP device maintaining the correspondence relationship between type information and a DRB identifier comprises: obtaining, by the AP device, a correspondence relationship between type information and a DRB configuration; and when the UE is connected to the AP device, setting up, by the AP device, the DRB for the UE using the DRB configuration, determining a DRB identifier corresponding to the setup DRB and determining a correspondence relationship between a DRB configuration and a DRB identifier; and determining the correspondence relationship between type information and a DRB identifier from the correspondence relationship between type information and a DRB configuration and the correspondence relationship between a DRB configuration and a DRB identifier; and notifying the UE of the correspondence relationship between type information and a DRB identifier. obtaining, by the AP device, a correspondence relationship between type information and a DRB configuration; and when the UE is connected to the AP device, setting up, by the AP device, the DRB for the UE using the DRB configuration, determining a DRB identifier corresponding to the setup DRB and determining a correspondence relationship between a DRB configuration and a DRB identifier; and determining the correspondence relationship between type information and a DRB identifier from the correspondence relationship between type information and a DRB configuration and the correspondence relationship between a DRB configuration and a DRB identifier; and notifying the UE of the correspondence relationship between type information and a DRB identifier.