# US 12,004,022 B2 · Method and apparatus for improving voice service quality in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,004,022 B2 - Document ID: US12004022B2 - Status: Granted - Kind: B2 - Application number: 18/181,024 - Filed: 2023-03-09 - Published: 2023-07-06 - Granted: 2024-06-04 - Earliest claimed: 2019-08-05 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Sangsoo Jeong - Web page: https://patentgrep.com/patent/US12004022B2 ## CPC - H04W 36/0033: {with transfer of context information} - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - H04W 36/0022: {for transferring data sessions between adjacent core network technologies} - H04W 36/00226: {wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]} - H04W 36/0066: {of control information between different types of networks in order to establish a new radio link in the target network} - H04W 36/14: Reselecting a network or an air interface - H04W 36/1443: {between licensed networks} - H04W 36/30: by measured or perceived connection quality data - H04W 36/304: {due to measured or perceived resources with higher communication quality} - H04W 76/16: Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer - H04W 76/30: Connection release - H04W 92/02: Inter-networking arrangements - 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 method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. ## Claims ### Claim 1 A method performed by a terminal in a wireless communication system, the method comprising: establishing a multiple-access protocol data unit (MA PDU) session in a 3rd generation partnership project (3GPP) access and a non-3rd generation partnership project (N3GPP) access in a 5th-generation system (5GS); determining whether the MA PDU session is moved to an evolved packet system (EPS) without an N26 interface between the 5GS and the EPS after the establishing the MA PDU session; and releasing a context related to an access traffic steering, switching and splitting (ATSSS), wherein the context related to the ATSSS is associated with ATSSS rules and measurement assistance information for the MA PDU session, wherein a release of the MA PDU session is triggered over the N3GPP access by a network entity in the 5GS. ### Claim 2 (depends on 1) The method of claim 1, further comprising: transmitting, to the network entity, a request message, wherein a request message includes a request type and session information. ### Claim 3 (depends on 2) The method of claim 2, wherein the request type is an indicator related to a handover. ### Claim 4 (depends on 2) The method of claim 2, wherein transmitting the request message comprises: transmitting a plurality of request messages according to a plurality of session identifiers, and wherein a plurality of session information, including session information for the MA PDU session, includes the plurality of session identifiers. ### Claim 5 A method performed by a network entity in a 5th-generation system (5GS) in a wireless communication system, the method comprising: triggering a release of a multiple-access protocol data unit (MA PDU) session over a non-3rd generation partnership project (N3GPP) access; and releasing a context related to an access traffic steering, switching and splitting (ATSSS), wherein the context related to the ATSSS is associated with ATSSS rules and measurement assistance information for the MA PDU session, wherein the MA PDU session is established in both a 3rd generation partnership project (3GPP) access and the N3GPP access in the 5GS, and wherein the MA PDU session is moved to an evolved packet system (EPS) without an N26 interface between the 5GS and the EPS. ### Claim 6 (depends on 5) The method of claim 5, further comprising: receiving, from a terminal, a request message, wherein a request message includes a request type and session information. ### Claim 7 (depends on 6) The method of claim 6, wherein the request type is an indicator related to a handover. ### Claim 8 (depends on 6) The method of claim 6, wherein receiving the request message comprises: receiving a plurality of request messages according to a plurality of session identifiers, and wherein a plurality of session information, including session information for the MA PDU session, includes the plurality of session identifiers. ### Claim 9 A terminal, comprising: a transceiver capable of transmitting and receiving at least one signal; and a controller coupled to the transceiver, wherein the controller is configured to: establish a multiple-access protocol data unit (MA PDU) session in a 3rd generation partnership project (3GPP) access and a non-3rd generation partnership project (N3GPP) access in a 5th-generation system (5GS), determine whether the MA PDU session associated with the terminal is moved to an evolved packet system (EPS) without an N26 interface between the 5GS and the EPS after establishing the MA PDU session, and release a context related to an access traffic steering, switching and splitting (ATSSS), wherein the context related to the ATSSS is associated with ATSSS rules and measurement assistance information for the MA PDU session, wherein a release of the MA PDU session is triggered over the N3GPP access by a network entity in the 5GS. ### Claim 10 (depends on 9) The terminal of claim 9, wherein the controller is further configured to transmit, to the network entity, a request message, and wherein a request message includes a request type and session information. ### Claim 11 (depends on 10) The terminal of claim 10, wherein the request type is an indicator related to a handover. ### Claim 12 (depends on 10) The terminal of claim 10, wherein the controller is configured to transmit a plurality of request messages according to a plurality of session identifiers, and wherein a plurality of session information, including session information for the MA PDU session, includes the plurality of session identifiers. ### Claim 13 A network entity in a 5th-generation system (5GS), the network entity comprising: a transceiver capable of transmitting and receiving at least one signal; and a controller coupled to the transceiver, wherein the controller is configured to: trigger a release of a multiple-access protocol data unit (MA PDU) session over a non-3rd generation partnership project (N3GPP) access, and release a context related to an access traffic steering, switching and splitting (ATSSS), wherein the context related to the ATSSS is associated with ATSSS rules and measurement assistance information for the MA PDU session, wherein the MA PDU session is established in both a 3rd generation partnership project (3GPP) access and the N3GPP access in the 5GS, and wherein the MA PDU session is moved to an evolved packet system (EPS) without an N26 interface between the 5GS and the EPS. ### Claim 14 (depends on 13) The network entity of claim 13, wherein the controller further is configured to receive, from a terminal, a request message, and wherein a request message includes a request type and session information. ### Claim 15 (depends on 14) The network entity of claim 14, wherein the request type is an indicator related to a handover. ### Claim 16 (depends on 14) The network entity of claim 14, wherein the controller is configured to transmit a plurality of request messages according to a plurality of session identifiers, and wherein a plurality of session information, including session information for the MA PDU session, includes the plurality of session identifiers.