Data transmission method, forwarding information update method, communications device, and controller

A forwarding information update method comprising:

• deciding on forwarding information of a data packet that is to be sent to a receive end, wherein the forwarding information comprises a correspondence between data filtering template information of the data packet and an interface of a communications device, and wherein the data filtering template information of the data packet is IP 5-tuple information, MPLS label information, or VLAN label information in header information of the data packet;
• and
• sending the forwarding information to the communications device;
• wherein the communications device is a base station, the receive end moves from a service range of a first base station to a service range of a second base station;
• deciding on first forwarding update information and second forwarding update information of the data packet sent to the receive end, wherein the first forwarding update information comprises a correspondence between the data filtering template information of the data packet and a first interface of the first base station, so that the first base station sends the data packet to the second base station through the interface;
• and the second forwarding update message comprises a correspondence between the data filtering template information of the data packet and a second interface of the second base station, wherein the second base station sends the data packet to the receive end through the second interface;
• and
• sending the first forwarding update information to the first base station, and sending the second forwarding update information to the second base station.

A communications device comprising:

• a receiver, wherein the receiver is configured to receive a data packet sent to a receive end;
• a processor;
• a memory storing a program to be executed in the processor, the program comprising instructions to
• determine an interface for forwarding the data packet to the receive end according to a correspondence between data filtering template information of the data packet and interface information in forwarding information stored in the communications device, wherein the data filtering template information of the data packet is IP 5-tuple information, MPLS label information, or VLAN label information in header information of the data packet;
• determine, by using the correspondence between the data filtering template information of the data packet and bearer information in the forwarding information, a bearer used for forwarding the data packet;
• and
• attach a label to the data packet, wherein the label is used to identify that the data packet is forwarded by using the bearer;
• and
• a transmitter, wherein the transmitter is configured to forward the data packet with the label to the interface, and forward the data packet through the interface by using the bearer.

A controller comprising:

• a processor;
• and
• a memory storing a program to be executed in the processor, the program comprising instructions to
• decide on forwarding information of a data packet sent to a receive end, wherein the forwarding information comprises a correspondence between data filtering template information of the data packet and an interface of a communications device, wherein the data filtering template information of the data packet is IP 5-tuple information, MPLS label information, or VLAN label information in header information of the data packet, wherein the communications device is a base station, and the receive end moves from a service range of a first base station to a service range of a second base station,
• decide on first forwarding update information and second forwarding update information of the data packet sent to the receive end, wherein the first forwarding update information comprises a correspondence between the data filtering template information of the data packet and a first interface of the first base station, wherein the first base station sends the data packet to the second base station through the interface, wherein the second forwarding update message comprises a correspondence between the data filtering template information of the data packet and a second interface of the second base station, wherein the second base station sends the data packet to the receive end through the second interface;
• and
• a transmitter configured to
• send the forwarding information to the communications device;
• send the first forwarding update information to the first base station, and
• send the second forwarding update information to the second base station.