Service processing method, apparatus, and system

A method of service processing, comprising:

• sending, by a controller, a first forwarding policy to a routing function device, wherein the routing function device is an anchor point of an Internet Protocol (IP) address of a user equipment (UE), the first forwarding policy comprises identification information of a processing function device and identification information of a traffic flow including a traffic flow identifier of the traffic flow;
• receiving, by the routing function device, the first forwarding policy from the controller;
• sending, by the controller, a processing policy to the processing function device;
• receiving, by the processing function device, the processing policy from the controller;
• sending, by the controller, a second forwarding policy to the processing function device;
• receiving, by the processing function device, the second forwarding policy from the controller;
• receiving, by the routing function device, a packet from an external network, and sending the packet to the processing function device according to the first forwarding policy, wherein the packet comprises the identification information of the traffic flow;
• and
• receiving, by the processing function device, the packet from the routing function device;
• processing, by the processing function device, the received packet according to the processing policy;
• and
• sending, by the processing function device, the packet to a base station according to the second forwarding policy.