# US 10,772,148 B2 · Method and apparatus for managing PDU session between base station and core network in next-generation wireless network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,772,148 B2 - Document ID: US10772148B2 - Status: Granted - Kind: B2 - Application number: 15/967,512 - Filed: 2018-04-30 - Published: 2018-11-01 - Granted: 2020-09-08 - Earliest claimed: 2017-04-28 - Assignees: Kt Corporation - Applicants: Kt Corporation - Inventors: Ha Sung Kim - Web page: https://patentgrep.com/patent/US10772148B2 ## CPC - H04W 76/20: Manipulation of established connections - H04W 28/0268: {using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR] (negotiating SLA or negotiating QoS H04W28/24)} - H04W 76/22: Manipulation of transport tunnels - H04W 76/32: Release of transport tunnels - H04W 80/12: Application layer protocols, e.g. WAP [Wireless Application Protocol] - H04W 92/045: {between access point and backbone network device} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Provided is a method for managing a packet data unit (PDU) session between a base station and a core network in a next generation/5G radio access network (hereinafter, also referred to as NR (New Radio)). The method may include determining whether a requirement of a quality of service (QoS) flow for a terminal is satisfied, transmitting, to a core network entity, a PDU session resource notification message indicating that the requirement is not satisfied when the requirement is not satisfied, receiving one of a PDU session resource modification message and a PDU session resource release message from the core network entity, and transmitting a processing result on one of the PDU session resource modification message and the PDU session resource release message to the core network entity. ## Claims ### Claim 1 A method for managing a Packet Data Unit (PDU) session by a base station, the method comprising: determining whether a requirement of a quality of service (QoS) flow for a terminal is satisfied; transmitting, to a core network entity, a PDU session resource notification message indicating that the requirement is not satisfied when the requirement is not satisfied; receiving 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 the core network entity; and performing one of the PDU session resource modification and the PDU session resource release in response to the received one and transmitting a processing result to the core network entity, 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. ### Claim 2 (depends on 1) The method of claim 1, wherein the PDU session resource notification message, the PDU session resource modification message, and the PDU session resource release message comprise at least one of a PDU session identifier, a QoS flow identifier, and a network slice identifier. ### Claim 3 (depends on 1) The method of claim 1, wherein the PDU session resource notification message includes an identifier of the QoS flow, the requirement of which is not satisfied, and information on dissatisfaction cause for the requirement. ### Claim 4 (depends on 1) The method of claim 1, wherein the base station stores network slice assistance information on the PDU session. ### Claim 5 (depends on 1) The method of claim 1, wherein the base station modifies a data radio bearer connected to the terminal according to one of the PDU session resource modification message and the PDU session resource release message. ### Claim 6 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. ### Claim 7 (depends on 6) The method of claim 6, wherein the PDU session resource notification message, the PDU session resource modification message, and the PDU session resource release message include at least one of a PDU session identifier, a QoS flow identifier, and a network slice identifier. ### Claim 8 (depends on 6) The method of claim 6, wherein the PDU session resource notification message includes an identifier of the QoS flow, the requirement of which is not satisfied, and information on cause why the requirement is not satisfied. ### Claim 9 (depends on 6) The method of claim 6, wherein the base station stores network slice assistance information on the PDU session. ### Claim 10 (depends on 6) The method of claim 6, wherein the base station modifies a data radio bearer connected to the terminal according to one of the PDU session resource modification message and the PDU session resource release message. ### Claim 11 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. ### Claim 12 (depends on 11) The base station of claim 11, wherein the PDU session resource notification message, the PDU session resource modification message, and the PDU session resource release message include at least one of a PDU session identifier, a QoS flow identifier, and a network slice identifier. ### Claim 13 (depends on 11) The base station of claim 11, wherein the PDU session resource notification message includes an identifier of the QoS flow, the requirement of which is not satisfied, and information on cause why the requirement is not satisfied. ### Claim 14 (depends on 11) The base station of claim 11, wherein the base station is configured to store network slice assistance information on the PDU session. ### Claim 15 (depends on 11) The base station of claim 11, wherein the controller modifies a data radio bearer connected to the terminal according to one of the PDU session resource modification message and the PDU session resource release message.