# US 2024/0205773 A1 · Session context conversion > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0205773 A1 - Document ID: US20240205773A1 - Status: Published application - Kind: A1 - Application number: 18/591,962 - Filed: 2024-02-29 - Published: 2024-06-20 - Earliest claimed: 2018-04-09 - Assignees: Nokia Technologies Oy - Applicants: Nokia Technologies Oy - Inventors: Sung Hwan Won; Devaki Chandramouli - Web page: https://patentgrep.com/patent/US20240205773A1 ## CPC - H04W 28/16: Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service] - H04W 36/0033: {with transfer of context information} - H04W 36/14: Reselecting a network or an air interface - H04W 36/0022: {for transferring data sessions between adjacent core network technologies} - H04W 76/16: Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer - H04W 88/08: Access point devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract In some example embodiments, there may be provided a method that includes receiving, at a user equipment while being served by a first system and during protocol data unit session establishment or modification procedure, a message including an access point name aggregate maximum bit rate value; and when there is an inter-system change from the first system to the second system, setting, at the user equipment, the access point name aggregate maximum bit rate value of a session management context for the second system to the received access point name aggregate maximum bit rate value received while being served by the first system. Related systems, methods, and articles of manufacture are also described. ## Claims ### Claim 1 A method comprising: receiving, at a user equipment, while being served by a first system and during a protocol data unit (PDU) session establishment procedure, a PDU SESSION ESTABLISHMENT ACCEPT message including an access point name aggregate maximum bit rate value of a second system; determining that there is an inter-system change from the first system to the second system; and in response to determining that there is an inter-system change from the first system to the second system, mapping, at the user equipment, the access point name aggregate maximum bit rate value of the second system received while being served by the first system to an access point name aggregate maximum bit rate value of a session management context for the second system. ### Claim 2 (depends on 1) The method of claim 1, wherein the first system comprises a fifth generation core network (5G CN), wherein the second system comprises a fourth generation evolved packet system (4G EPS), wherein the inter-system change includes a change from an N1 mode to an S1 mode, and wherein the access point name aggregate maximum bit rate value of the second system is used to maintain session continuity during the inter-system change from the N1 mode to the S1 mode. ### Claim 3 (depends on 1) The method of claim 1, wherein the message including the access point name aggregate maximum bit rate value of the second system is received from a node in the first system. ### Claim 4 (depends on 3) The method of claim 3, wherein the node in the first system comprises one or more of: a packet data network gateway-control plane function (PGW-C), a session management function (SMF), or a packet data network gateway-control plane function co-located with the session management function. ### Claim 5 (depends on 1) The method of claim 1, further comprising: storing, at the user equipment, the access point name aggregate maximum bit rate value of the second system as part of a PDU session context. ### Claim 6 (depends on 1) The method of any of claim 1, further comprising in an instance in which the user equipment receives an indication to remove Quality of Service (QoS) parameters associated with a QoS flow, while being served by a first system and during a protocol data unit (PDU) session modification procedure, removing, at the user equipment, an access point name aggregate maximum bit rate value associated with the QoS flow. ### Claim 7 (depends on 6) The method of any of claim 6, further comprising receiving, while being served by the first system and during a further PDU session modification procedure, a PDU SESSION MODIFICATION COMMAND message including a new access point name aggregate maximum bit rate value of the second system; and in an instance in which there is an inter-system change from the first system to the second system, mapping the new access point name aggregate maximum bit rate value of the second system received while being served by the first system to an access point name aggregate maximum bit rate value of a session management context for the second system. ### Claim 8 (depends on 1) The method of claim 1, wherein the session management context for the second system is a default Evolved Packet System (EPS) bearer context. ### Claim 9 An apparatus comprising: at least one processor; and at least one memory storing instructions thereon that, when executed by the at least one processor, cause the apparatus to perform at least: receiving, while being served by a first system and during a protocol data unit (PDU) session establishment procedure, a PDU SESSION ESTABLISHMENT ACCEPT message including an access point name aggregate maximum bit rate value of a second system; and upon an inter-system change from the first system to the second system, mapping the access point name aggregate maximum bit rate value of the second system received while being served by the first system to an access point name aggregate maximum bit rate value of a session management context for the second system. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the first system comprises a fifth generation core network (5G CN), wherein the second system comprises a fourth generation evolved packet system (4G EPS), wherein the inter-system change includes a change from an N1 mode to an S1 mode, and wherein the access point name aggregate maximum bit rate value of the second system is used to maintain session continuity during the inter-system change from the N1 mode to the S1 mode. ### Claim 11 (depends on 9) The apparatus of claim 9, wherein the message including the access point name aggregate maximum bit rate value of the second system is received from a node in the first system. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the node in the first system comprises one or more of: a packet data network gateway-control plane function (PGW-C), a session management function (SMF), or a packet data network gateway-control plane function co-located with the session management function. ### Claim 13 (depends on 9) The apparatus of claim 9, wherein the instructions stored on the at least one memory, when executed by the at least one processor, further cause the apparatus to perform at least: storing the access point name aggregate maximum bit rate value of the second system as part of a PDU session context. ### Claim 14 (depends on 9) The apparatus of claim 9, wherein the apparatus is a user equipment and further comprises a transmitter. ### Claim 15 (depends on 9) The apparatus of claim 9, wherein the apparatus is comprised in a user equipment. ### Claim 16 (depends on 9) The apparatus of claim 9, wherein the instructions stored on the at least one memory, when executed by the at least one processor, further cause the apparatus to perform at least: in an instance in which the apparatus receives an indication to remove Quality of Service (QoS) parameters associated with a QoS flow, while being served by a first system and during a protocol data unit (PDU) session modification procedure, removing, at the apparatus, an access point name aggregate maximum bit rate value associated with the QoS flow. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein the instructions stored on the at least one memory, when executed by the at least one processor, further cause the apparatus to perform at least: receiving, while being served by the first system and during a further PDU session modification procedure, a PDU SESSION MODIFICATION COMMAND message including a new access point name aggregate maximum bit rate value of the second system; and in an instance in which there is an inter-system change from the first system to the second system, mapping the new access point name aggregate maximum bit rate value of the second system received while being served by the first system to an access point name aggregate maximum bit rate value of a session management context for the second system. ### Claim 18 (depends on 9) The apparatus of claim 9, wherein the session management context for the second system is a default Evolved Packet System (EPS) bearer context. ### Claim 19 A non-transitory computer-readable storage medium comprising program instructions stored thereon, when executed by a processor, cause performance of at least the following: receiving, at a user equipment, while being served by a first system and during a protocol data unit (PDU) session establishment procedure, a PDU SESSION ESTABLISHMENT ACCEPT message including an access point name aggregate maximum bit rate value of a second system; and upon an inter-system change from the first system to the second system, mapping, at the user equipment, the access point name aggregate maximum bit rate value of the second system received while being served by the first system to an access point name aggregate maximum bit rate value of a session management context for the second system. ### Claim 20 (depends on 19) The non-transitory computer-readable storage medium of claim 19, wherein the first system comprises a fifth generation core network (5G CN), wherein the second system comprises a fourth generation evolved packet system (4G EPS), wherein the inter-system change includes a change from an N1 mode to an S1 mode, and wherein the access point name aggregate maximum bit rate value of the second system is used to maintain session continuity during the inter-system change from the N1 mode to the S1 mode. ### Claim 21 (depends on 19) The non-transitory computer-readable storage medium of claim 19, wherein the message including the access point name aggregate maximum bit rate value of the second system is received from a node in the first system. ### Claim 22 (depends on 21) The non-transitory computer-readable storage medium of claim 21 wherein the node in the first system comprises one or more of: a packet data network gateway-control plane function (PGW-C), a session management function (SMF), or a packet data network gateway-control plane function co-located with the session management function. ### Claim 23 (depends on 19) The non-transitory computer-readable storage medium of claim 19, wherein the program instructions, when executed by the processor, further cause performance of at least: causing storage, at the user equipment, of the access point name aggregate maximum bit rate value of the second system as part of a PDU session context. ### Claim 24 (depends on 19) The non-transitory computer-readable storage medium of claim 19, wherein the program instructions, when executed by the processor, further cause performance of at least: in an instance in which the user equipment receives an indication to remove Quality of Service (QoS) parameters associated with a QoS flow, while being served by a first system and during a protocol data unit (PDU) session modification procedure, removing, at the user equipment, an access point name aggregate maximum bit rate value associated with the QoS flow. ### Claim 24 (depends on 24) The non-transitory computer-readable storage medium of claim 24, wherein the program instructions, when executed by the processor, further cause performance of at least: receiving, while being served by the first system and during a further PDU session modification procedure, a PDU SESSION MODIFICATION COMMAND message including a new access point name aggregate maximum bit rate value of the second system; and in an instance in which there is an inter-system change from the first system to the second system, mapping the new access point name aggregate maximum bit rate value of the second system received while being served by the first system to an access point name aggregate maximum bit rate value of a session management context for the second system. ### Claim 25 (depends on 19) The non-transitory computer-readable storage medium of claim 19, wherein the session management context for the second system is a default Evolved Packet System (EPS) bearer context. ### Claim 26 An apparatus comprising: at least one processor; and at least one memory storing instructions thereon that, when executed by the at least one processor, cause the apparatus to perform at least: receiving, from a first system comprising a fifth generation core network (5G CN), a PROTOCOL DATA UNIT (PDU) SESSION ESTABLISHMENT ACCEPT message comprising an access point name aggregate maximum bit rate (APN-AMBR) value for use in a second system comprising a fourth generation (4G) Evolved Packet System (EPS); storing the APN-AMBR value as part of a PDU session context, the APN-AMBR value being associated with a quality of service (QoS) flow; in an instance in which the QoS flow is deleted prior to an inter-system change from the first system to the second system, removing the APN-AMBR value; and in an instance in which the QoS flow is not deleted and there is an inter-system change from the first system to the second system while the APN-AMBR value is stored as part of the PDU session context, mapping the APN-AMBR value received from the first system to an APN-AMBR value of an EPS bearer context in the second system.