Method for transmitting and receiving data in wireless communication system, and device therefor

A packet data network (PDN) gateway (P-GW) apparatus for transmitting downlink (DL) data in a wireless communication system, the apparatus comprising:

• a communication module configured to transmit and receive signals;
• and
• a processor configured to:
• control the communication module to receive DL data in which an Internet protocol (IP) header including an IP address of a user equipment (UE) has been encapsulated from an application server;
• remove the IP header from the received DL data;
• determine one of a plurality of groups to which the UE belongs based on the IP address;
• generate revised DL data by incorporating an identifier of the UE into the received DL data to identify the UE in the one of a plurality of groups;
• update a group context for the UE when an evolved-NodeB (eNB) serving the UE changes;
• and
• control the communication module to transmit the revised DL data to a serving gateway (S-GW) through a group bearer configured for the one of a plurality of groups in order to transmit the revised DL data to the UE,
• wherein the IP header is not incorporated into the revised DL data when the DL data is for a non-IP PDN connection,
• wherein the IP header is incorporated in the revised DL data when the DL data is for an IP PDN connection,
• wherein a different path is configured for each group bearer from the P-GW to the UE,
• wherein all UEs belonging to a same evolved-NodeB (eNB) are configured to a same group,
• wherein a tracking area update (TAU) procedure is performed when the eNB serving the UE changes,
• wherein a dedicated radio resource pool is configured for each of the plurality of groups,
• wherein a resource for transmitting uplink data is arbitrarily selected from the dedicated radio resource pool configured for a group to which the UE belongs, and
• wherein updating the group context comprises:
• receiving, from a serving gateway, a group context updating request including an in-group UE ID for identifying the UE in a group to which the UE belongs and a group ID for identifying a group bearer,
• checking whether the group context of the group to which the UE belongs has been generated;
• updating the UE information in the group context;
• and
• transmitting a group context updating response message to the serving gateway.