Bearer setup method, related apparatus, and system

A core network device, comprising:

• a receiver configured to receive a first tunnel endpoint from a first base station, wherein the first tunnel endpoint comprises a first tunnel endpoint identifier (TEID) and a first transport layer address, the first tunnel endpoint is allocated by the first base station to indicate a destination of data transmitted in a downlink data transmission path of a first bearer;
• a transmitter configured to send a second tunnel endpoint to the first base station, wherein the second tunnel endpoint comprises a second TEID and a second transport layer address, the second tunnel endpoint is allocated by the core network device to indicate a destination of data transmitted in an uplink data transmission path of the first bearer;
• and
• a processor configured to complete setup of the first bearer with the first base station, for transmitting the uplink data and the downlink data.

A first base station, comprising:

• a receiver configured to receive a first bearer setup request message initiated by user equipment (UE);
• and receive, based on the first bearer setup request message, a second tunnel endpoint from a core network device, wherein the second tunnel endpoint comprises a second tunnel endpoint identifier (TEID) and a second transport layer address, the second tunnel endpoint is allocated by the core network device to indicate a destination of data transmitted in an uplink data transmission path of a first bearer;
• a transmitter configured to send a first tunnel endpoint to the core network device, wherein the first tunnel endpoint comprises a first TEID and a first transport layer address, the first tunnel endpoint is allocated by the first base station to indicate a destination of data transmitted in a downlink data transmission path of the first bearer;
• and
• a processor configured to complete setup of the first bearer with the core network device for transmitting the uplink data and the downlink data.