# US 2021/0345441 A1 · Session management method, mobility management functional entity and session management functional entity > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0345441 A1 - Document ID: US20210345441A1 - Status: Published application - Kind: A1 - Application number: 16/341,790 - Filed: 2017-09-08 - Published: 2021-11-04 - Earliest claimed: 2016-10-14 - Assignees: China Academy of Telecommunications Technology - Applicants: China Academy of Telecommunications Technology - Inventors: Hucheng WANG - Web page: https://patentgrep.com/patent/US20210345441A1 ## CPC - H04W 76/25: Maintenance of established connections - H04W 4/021: Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences - H04W 4/027: {using movement velocity, acceleration information} - H04W 8/08: Mobility data transfer - H04W 36/0016: {Hand-off preparation specially adapted for end-to-end data sessions} - H04W 60/04: using triggered events - H04W 76/22: Manipulation of transport tunnels - H04W 76/38: triggered by timers - H04W 80/10: adapted for {application} session management, e.g. SIP [Session Initiation Protocol] {(connection management H04W76/00; arrangements for session management H04L67/14)} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present disclosure provides a session management method, a mobility management functional entity and a session management functional entity. The session management method includes: judging, by a mobility management functional entity, whether a UE has moved out of an allowed area; when the UE has moved out of the allowed area, determining, by the mobility management functional entity, a management message for a session of the UE; and transmitting, by the mobility management functional entity, the management message to a session management functional entity for serving the UE. The management message is adopted to trigger the session management functional entity to manage the session of the UE. ## Claims ### Claim 1 A session management method, comprising: judging, by a mobility management functional entity, whether a User Equipment (UE) has moved out of an allowed area; when the UE has moved out of the allowed area, determining, by the mobility management functional entity, a management message for a session of the UE; and transmitting, by the mobility management functional entity, the management message to a session management functional entity for serving the UE, wherein the management message is adopted to trigger the session management functional entity to manage the session of the UE. ### Claim 2 (depends on 1) The session management method according to claim 1, wherein the determining, by the mobility management functional entity, the management message for the session of the UE comprises: judging, by the mobility management functional entity, whether the UE is capable of acquiring a network service continuously; and when the UE is incapable of acquiring the network service continuously, determining, by the mobility management functional entity, a management message for deleting the entire session of the UE or a user plane of the session; or wherein the transmitting, by the mobility management functional entity, the management message to the session management functional entity for serving the UE comprises: starting a timer by the mobility management functional entity; and transmitting, by the mobility management functional entity, the management message to the session management functional entity for serving the UE after the timer is timed out. ### Claim 3 (canceled) ### Claim 4 (depends on 3) The session management method according to claim 3, wherein prior to starting the timer by the mobility management functional entity, the session management method further comprises: acquiring, by the mobility management functional entity, mobility information of the UE; and judging, by the mobility management functional entity, whether it is possible for the UE to move back to the allowed area in accordance with the mobility information of the UE, wherein the starting the timer by the mobility management functional entity comprises, when it is possible for the UE to move back to the allowed area, starting the timer by the mobility management functional entity. ### Claim 5 (depends on 2) The session management method according to claim 2, wherein subsequent to determining, by the mobility management functional entity, whether the UE is capable of acquiring the network service continuously, the session management method further comprises: when the UE is capable of acquiring the network service continuously, updating, by the mobility management functional entity, a mobility level for the UE; and/or determining, by the mobility management functional entity, a management message for updating the session of the UE, wherein the management message for updating the session of the UE is adopted to trigger the session management functional entity to update a user plane transmission path for the session; or wherein subsequent to judging, by the mobility management functional entity, whether the UE is capable of acquiring the network service continuously, the session management method further comprises: when the UE is capable of acquiring the network service continuously, receiving, by the mobility management functional entity, a switching request transmitted from an access network node for switching the session to a target access network node; and determining, by the mobility management functional entity, a management message for switching the session to the target access network node. ### Claim 6 (canceled) ### Claim 7 (depends on 1) The session management method according to claim 1, wherein subsequent to transmitting, by the mobility management functional entity, the management message to the session management functional entity for serving the UE, the session management method further comprises: receiving, by the mobility management functional entity, management confirmation information transmitted from the session management functional entity; and transmitting, by the mobility management functional entity, feedback information to the UE in accordance with the management confirmation information. ### Claim 8 (depends on 2) The session management method according to claim 2, wherein the network service comprises a session connection between the UE and a network. ### Claim 9 (depends on 1) The session management method according to claim 1, wherein the mobility management functional entity and the session management functional entity are arranged in a same control plane management functional entity. ### Claim 10 (depends on 1) The session management method according to claim 1, wherein the judging, by the mobility management functional entity, whether the UE has moved out of the allowed area comprises: judging, by the mobility management functional entity, whether the UE has moved out of the allowed area in accordance with a position report about the UE or information reported by a base station. ### Claim 11 A session management method, comprising: receiving, by a session management functional entity for serving a UE, a management message transmitted from a mobility management functional entity; and managing, by the session management functional entity, a session of the UE in accordance with the management message. ### Claim 12 (depends on 11) The session management method according to claim 11, wherein the management message transmitted from the mobility management functional entity comprises at least one of a management message for deleting the entire session of the UE or a user plane of the session, a management message for updating the session of the UE, or a management message for switching the session of the UE to a target access network node. ### Claim 13 (depends on 12) The session management method according to claim 12, wherein the managing, by the session management functional entity, the session of the UE in accordance with the management message comprises: updating, by the session management functional entity, a user plane transmission path for the session in accordance with the management message for updating the session of the UE. ### Claim 14 (depends on 13) The session management method according to claim 13, wherein the updating, by the session management functional entity, the user plane transmission path for the session in accordance with the management message for updating the session of the UE comprises: updating, by the session management functional entity, the user plane transmission path for the session in accordance with the management message for updating the session of the UE and an Access Point Name (APN) of a Protocol Data Unit (PDU). ### Claim 15 (depends on 12) The session management method according to claim 12, wherein the managing, by the session management functional entity, the session of the UE in accordance with the management message comprises: switching, by the session management functional entity, the user plane transmission path for the session to the target access network node in accordance with the management message for switching the session of the UE to the target access network node. ### Claim 16 (depends on 11) The session management method according to claim 11, wherein the managing, by the session management functional entity, the session of the UE in accordance with the management message comprises: starting a timer by the session management functional entity; and managing, by the session management functional entity, the session of the UE in accordance with the management message after the timer is timed out. ### Claim 17 (depends on 16) The session management method according to claim 16, wherein prior to starting the timer by the session management functional entity, the session management method further comprises judging, by the session management functional entity, whether it is necessary to start the timer in accordance with an APN of the session, wherein the starting the timer by the session management functional entity comprises, when it is determined by the session management functional entity, starting the timer by the session management functional entity. ### Claim 18 (depends on 11) The session management method according to claim 11, wherein subsequent to managing, by the session management functional entity, the session of the UE in accordance with the management message, the session management method further comprises: transmitting, by the session management functional entity, management confirmation information to the mobility management functional entity. ### Claim 19 (depends on 11) The session management method according to claim 11, wherein the session management functional entity and the mobility management functional entity are arranged in a same control plane management functional entity. ### Claim at position 20 20-38. (canceled) ### Claim 39 (depends on 1) A mobility management functional entity, comprising a processor, a memory and a transceiver, wherein the processor is configured to read and execute a program stored in the memory, so as to implement the session management method of claim 1, wherein the transceiver is configured to receive and transmit data, and the memory is configured to store therein data for the operation of the processor. ### Claim 40 (depends on 9) A session management functional entity, comprising a processor, a memory and a transceiver, wherein the processor is configured to read and execute a program stored in the memory, so as to implement the session management method of claim 9, wherein the transceiver is configured to receive and transmit data, and the memory is configured to store therein data for the operation of the processor.