# US 2019/0174573 A1 · Method, session management function node, user plane function node, and user equipment for session management parameters maintenance and computer readable recording medium therein > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0174573 A1 - Document ID: US20190174573A1 - Status: Published application - Kind: A1 - Application number: 16/324,187 - Filed: 2017-10-11 - Published: 2019-06-06 - Earliest claimed: 2016-10-11 - Assignees: NEC Corporation - Applicants: NEC Corporation - Inventors: Genadi VELEV; Andreas KUNZ; Toshiyuki TAMURA - Web page: https://patentgrep.com/patent/US20190174573A1 ## CPC - H04W 76/38: triggered by timers - H04L 12/1407: {Policy-and-charging control [PCC] architecture} - H04M 15/66: {Policy and charging system} - H04W 76/12: Setup of transport tunnels - H04W 80/10: adapted for {application} session management, e.g. SIP [Session Initiation Protocol] {(connection management H04W76/00; arrangements for session management H04L67/14)} - H04L 67/143: Termination or inactivation of sessions, e.g. event-controlled end of session - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) ## Abstract The method proposes to establish at least one session between the User Equipment and the Session Management Function node, and initiate session deactivation for a session indicated by the User Plane Function node, upon detection inactivity of User Plane connection for the session for a period by the User Plane Function node. ## Claims ### Claim at position 1 1-13. (canceled) ### Claim 14 A Session Management Function (SMF) node comprising: a memory storing instructions; and at least one processor configured to process the instructions to: establish a Protocol Data Unit (PDU) session with a User Equipment (UE), transmit a message including an inactivity timer for the PDU session, to a User Plane Function (UPF) node, and receive, from the UPF node, information for initiating session deactivation for the PDU session. ### Claim 15 (depends on 14) The SMF node according to claim 14, wherein the at least one processor is configured to process the instructions to receive, from a Data Management node, a message including session parameters. ### Claim 16 (depends on 14) The SMF node according to claim 14, wherein the at least one processor is configured to process the instructions to receive the information upon expiration of the inactivity timer. ### Claim 17 A User Plane Function (UPF) node comprising: a memory storing instructions; and at least one processor configured to process the instructions to: receive a message including an inactivity timer for a Protocol Data Unit (PDU) session between a User Equipment (UE) and a Session Management Function (SMF) node, from the SMF node; detect inactivity of user data transfer for the PDU session, for a period; and transmit, to the SMF node, information for initiating, by the SMF node, session deactivation for the PDU session. ### Claim 18 (depends on 17) The UPF node according to claim 17, wherein the at least one processor is configured to process the instructions to detect inactivity of the user data transfer for the PDU session for the period upon expiration of the inactivity timer. ### Claim 19 A mobile communication system comprising: a Session Management Function (SMF) node and a User Plane Function (UPF) node, and wherein the SMF node is configured to: establish a Protocol Data Unit (PDU) session with a User Equipment (UE), transmit a message including an inactivity timer for the PDU session, to the UPF node, and receive, from the UPF node, information for initiating session deactivation for the PDU session, and the UPF node is configured to: receive the message including the inactivity timer for the PDU session, from the SMF node; detect inactivity of user data transfer for the PDU session, for a period; and transmit, to the SMF node, information for initiating, by the SMF node, session deactivation for the PDU session. ### Claim 20 A session management method comprising: establishing a Protocol Data Unit (PDU) session with a User Equipment (UE); transmitting a message including an inactivity timer for the PDU session, to a User Plane Function (UPF) node; and receiving, from the UPF node, information for initiating session deactivation for the PDU session. ### Claim 21 (depends on 20) The session management method according to claim 20, further comprising receiving, from a Data Management node, a message including session parameters. ### Claim 22 (depends on 20) The session management method according to claim 20, wherein the receiving of the information is performed upon expiration of the inactivity timer. ### Claim 23 A User Equipment (UE) inactivity detecting method, comprising: receiving a message including an inactivity timer for a Protocol Data Unit (PDU) session between a User Equipment (UE) and a Session Management Function (SMF) node, from the SMF node; detecting inactivity of user data transfer for the PDU session, for a period; and transmitting, to the SMF node, information for initiating, by the SMF node, session deactivation of the PDU session. ### Claim 24 (depends on 23) The UE inactivity detecting method according to claim 23, wherein the detecting inactivity of the user data transfer for the PDU session for the period is performed upon expiration of the inactivity timer. ### Claim 25 A non-transitory computer readable recording medium recording a program, the program, when executed by a processor of a computing device, causing the processor to execute a session management method comprising: establishing a Protocol Data Unit (PDU) session with a User Equipment (UE); transmitting a message including an inactivity timer for the PDU session, to a User Plane Function (UPF) node; receiving, from the UPF node, information for initiating session deactivation for the PDU session. ### Claim 26 A non-transitory computer readable recording medium recording a program, the program, when executed by a processor of a computing device, causing the processor to execute a User Equipment (UE) inactivity detecting method, comprising: receiving a message including an inactivity timer for a Protocol Data Unit (PDU) session between a User Equipment (UE) and a Session Management Function (SMF) node, from the SMF node; detecting inactivity of user data transfer for the PDU session, for a period; and transmitting, to the SMF node, information for initiating, by the SMF node, session deactivation of the PDU session.