# US 12,225,597 B2 · Session and mobility management method using NAS protocols > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,597 B2 - Document ID: US12225597B2 - Status: Granted - Kind: B2 - Application number: 17/608,126 - Filed: 2020-04-29 - Published: 2022-07-14 - Granted: 2025-02-11 - Earliest claimed: 2019-05-02 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Kyungjoo Suh; Sangsoo Jeong - Web page: https://patentgrep.com/patent/US12225597B2 ## CPC - H04W 76/10: Connection setup - H04W 76/16: Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer - H04W 72/04: Wireless resource allocation - H04W 76/20: Manipulation of established connections - H04W 76/11: Allocation or use of connection identifiers - H04W 76/19: Connection re-establishment - H04W 76/22: Manipulation of transport tunnels - H04W 76/32: Release 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)} - 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 relates to a communication technique for managing mobility and sessions in the case of supporting multiple access of 3GPP access and non-3GPP access in a 5G communication system for supporting a data transmission rate higher than that of a 4G system, and a system therefor. The present disclosure can be applied, on the basis of 5G communication technology, to services requiring the high speed, high transmission rate, low latency, high reliability, and the like of 5G or intelligent services (e.g. smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, security and safety-related services, etc.). The present disclosure discloses an efficient session and mobility management method using NAS protocols. ## Claims ### Claim 1 A method performed by a terminal in a communication system, the method comprising: establishing a multi-access (MA) protocol data unit (PDU) session associated with a 3rd generation partnership project (3GPP) access and non-3GPP access; determining to reactivate a user plane resource of the MA PDU session for one access among the 3GPP access and the non-3GPP access; transmitting, to an access and mobility management function (AMF), a service request message over the one access, the service request message including uplink status information, and the uplink status information indicating the MA PDU session associated with the one access having pending uplink data; and receiving, from the AMF, a service accept message including information on a reactivation result for the user plane resource of the MA PDU session, wherein in case that the information on the reactivation result indicates a failure for reactivation of the user plane resource, the service accept message further includes information on an error cause of the failure, and wherein the error cause indicates insufficient resources for a specific slice. ### Claim 2 (depends on 1) The method of claim 1, wherein: in case that the user plane resource of the MA PDU session is associated with the 3GPP access, the service request message is transmitted over the 3GPP access, and in case that the user plane resource of the MA PDU session is associated with the non-3GPP access, the service request message is transmitted over the non-3GPP access. ### Claim 3 (depends on 1) The method of claim 1, wherein the uplink status information indicates that uplink data to be sent is pending for the MA PDU session. ### Claim 4 A method performed by an access and mobility management function (AMF) in a communication system, the method comprising: receiving, from a terminal, a service request message including uplink status information over one access among a 3rd generation partnership project (3GPP) access and a non-3GPP access which are associated with a multi-access (MA) protocol data unit (PDU) session, the uplink status information indicating the MA PDU session associated with the one access having pending uplink data; and transmitting, to the terminal, a service accept message including information on a reactivation result of a user plane resource of the MA PDU session for the one access, based on the uplink status information, wherein, in case that the information on the reactivation result indicates a failure for reactivation of the user plane resource, the service accept message further includes information on an error cause of the failure, and wherein the error cause indicates insufficient resources for a specific slice. ### Claim 5 (depends on 4) The method of claim 4, wherein: in case that the user plane resource of the MA PDU session is associated with the 3GPP access, the service request message is received over the 3GPP access, and in case that the user plane resource of the MA PDU session is associated with the non-3GPP access, the service request message is received over the non-3GPP access. ### Claim 6 (depends on 4) The method of claim 4, wherein the uplink status information indicates that the MA PDU session has uplink data pending to be sent. ### Claim 7 A terminal in a communication system, the terminal comprising: a transceiver; and a controller coupled with the transceiver and configured to: establish a multi-access (MA) protocol data unit (PDU) session associated with a 3rd generation partnership project (3GPP) access and non-3GPP access, determine to reactivate a user plane resource of the MA PDU session for one access among the 3GPP access and the non-3GPP access, transmit, to an access and mobility management function (AMF), a service request message over the one access, the service request message including uplink status information, and the uplink status information indicating the MA PDU session associated with the one access having pending uplink data, and receive, from the AMF, a service accept message including information on a reactivation result for the user plane resource of the MA PDU session, wherein in case that the information on the reactivation result indicates a failure for reactivation of the user plane resource, the service accept message further includes information on an error cause of the failure, and wherein the error cause indicates insufficient resources for a specific slice. ### Claim 8 (depends on 7) The terminal of claim 7, wherein: in case that the user plane resource of the MA PDU session is associated with the 3GPP access, the service request message is transmitted over the 3GPP access, and in case that the user plane resource of the MA PDU session is associated with the non-3GPP access, the service request message is transmitted over the non-3GPP access. ### Claim 9 (depends on 7) The terminal of claim 7, wherein the uplink status information indicates that the MA PDU session has uplink data pending to be sent. ### Claim 10 An access and mobility management function (AMF) in a communication system, the AMF comprising: a transceiver; and a controller coupled with the transceiver and configured to: receive, from a terminal, a service request message including uplink status information over one access among a 3rd generation partnership project (3GPP) access and a non-3GPP access which are associated with a multi-access (MA) protocol data unit (PDU) session, the uplink status information indicating the MA PDU session associated with the one access having pending uplink data, and transmit, to the terminal, a service accept message including information on a reactivation result of a user plane resource of the MA PDU session for the one access, based on the uplink status information, wherein, in case that the information on the reactivation result indicates a failure for reactivation of the user plane resource, the service accept message further includes information on an error cause of the failure, and wherein the error cause indicates insufficient resources for a specific slice. ### Claim 11 (depends on 10) The AMF of claim 10, wherein: in case that the user plane resource of the MA PDU session is associated with the 3GPP access, the service request message is received over the 3GPP access, and in case that the user plane resource of the MA PDU session is associated with the non-3GPP access, the service request message is received over the non-3GPP access. ### Claim 12 (depends on 10) The AMF of claim 10, wherein the uplink status information indicates that the MA PDU session has uplink data pending to be sent.