Method and apparatus for managing PDU session between base station and core network in next-generation wireless network

A method for managing a Packet Data Unit (PDU) session by a core network entity, the method comprising:

• receiving a PDU session resource notification message indicating dissatisfaction for a requirement of a quality of service (QoS) flow for a terminal, from a base station;
• transmitting one of a PDU session resource modification message for requesting the base station to perform PDU session resource modification and a PDU session resource release message for requesting the base station to perform PDU session resource release to the base station;
• and
• receiving a processing result on one of performing the PDU session resource modification in response to the PDU session resource modification message and performing the PDU session resource release in response to the PDU session resource release message from the base station,
• wherein the PDU session resource notification message, the PDU session resource modification message, and the PDU session resource release message are transmitted through an New Generation Application Protocol (NGAP) message.

A base station for managing a Packet Data Unit (PDU) session, the base station comprising:

• a controller configured to determine whether a requirement of a quality of service (QoS) flow for a terminal is satisfied;
• a receiver configured to receive one of a PDU session resource modification message for requesting PDU session resource modification and a PDU session resource release message for requesting PDU session resource release from a core network entity;
• and
• a transmitter configured to transmit, to a core network entity, a PDU session resource notification message indicating that the requirement is not satisfied when it is determined that the requirement is not satisfied, and to transmit, to the core network entity, a processing result on one of performing the PDU session resource modification in response to the PDU session resource modification message and performing the PDU session resource release in response to the PDU session resource release message,
• wherein the PDU session resource notification message, the PDU session resource modification message, and the PDU session resource release message are transmitted through an New Generation Application Protocol (NGAP) message.