Method and apparatus for transceiving data using plurality of carriers in mobile communication system

A method by a second node, the method comprises:

• receiving, from a first node, a message for configuring a bearer with a terminal;
• receiving, by a radio link control (RLC) entity, a packet data convergence protocol (PDCP) protocol data unit (PDU) with a PDCP header from a PDCP entity of the first node using the bearer based on a GPRS Tunnel Protocol (GTP), the bearer being configured for transmitting downlink data between the PDCP entity of the first node and the RLC entity of a second node;
• and
• transmitting the PDCP PDU to the terminal.

A method by a terminal, the method comprises:

• receiving, from a first node, a message for configuring a second node and configuring a bearer based on a GPRS Tunnel Protocol (GTP), the bearer being for receiving downlink data between a first packet data convergence protocol (PDCP) entity of the first node and a second radio link control (RLC) entity of the second node and being for transmitting uplink data between the PDCP entity and a RLC entity of the first node;
• determining a node among the first node and the second node for transmitting an uplink data;
• and
• transmitting the uplink data to the determined node,
• wherein an RLC entity is respectively included in the first node and the second node, and
• wherein a downlink PDCP protocol data unit (PDU) with a PDCP header is transmitted from the first PDCP entity of the first node to the second RLC entity of the second node.

A first node comprises:

• a transceiver configured to transmit and receive a signal;
• and
• at least one processor coupled with the transceiver and configured to:
• control the transceiver to transmit, to a terminal, a message for configuring a first bearer with a second node,
• control the transceiver to receive a first packet, generate a packet data convergence protocol (PDCP) protocol data unit (PDU), from the first packet with a PDCP header by a first PDCP entity of the first node, and
• control the transceiver to transmit the PDCP PDU to the second node using the first bearer based on a GPRS Tunnel Protocol (GTP), the first bearer being configured for transmitting downlink data between the first PDCP entity of the first node and a radio link control (RLC) entity of the second node.

A second node comprises:

• a transceiver configured to transmit and receive a signal;
• and
• at least one processor coupled with the transceiver and configured to control the transceiver to:
• receive, from a first node, a message for configuring a bearer with a terminal,
• receive, by a radio link control (RLC) entity, a packet data convergence protocol (PDCP) protocol data unit (PDU) with a PDCP header from a PDCP entity of the first node using the bearer based on a GPRS Tunnel Protocol (GTP), the bearer being configured for transmitting downlink data between the PDCP entity of the first node and the RLC entity of the second node, and
• transmit the PDCP PDU to the terminal.

A terminal comprises:

• a transceiver configured to transmit and receive a signal;
• and
• at least one processor coupled with the transceiver and configured to:
• control the transceiver to receive, from a first node, a message for configuring a second node and configure a bearer based on a GPRS Tunnel Protocol (GTP), the bearer being for receiving downlink data between a first packet data convergence protocol (PDCP) entity of the first node and a second radio link control (RLC) entity of the second node and being for transmitting uplink data between the PDCP entity and a RLC entity of the first node,
• determine a node among the first node and the second node for transmitting an uplink data, and
• control the transceiver to transmit the uplink data to the determined node,
• wherein an RLC entity is respectively included in the first node and the second node, and
• wherein a downlink PDCP protocol data unit (PDU) with a PDCP header is transmitted from the first PDCP entity of the first node to the second RLC entity of the second node.