# US 12,114,197 B2 · Congestion control in AMF and SMF > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,114,197 B2 - Document ID: US12114197B2 - Status: Granted - Kind: B2 - Application number: 17/429,865 - Filed: 2020-02-14 - Published: 2022-05-05 - Granted: 2024-10-08 - Earliest claimed: 2019-02-14 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Peter Hedman; Ivo Sedlacek; Juying Gan; George Foti - Web page: https://patentgrep.com/patent/US12114197B2 ## CPC - H04L 67/14: Session management (for real-time applications in data packet communications networks H04L65/1066) - H04W 28/0226: {based on location or mobility (handoff or reselection H04W36/00; mobile application services making use of the location of users or terminals H04W4/02)} - H04W 28/0289: {Congestion control (load shedding arrangements in network planning H04W16/08; performing reselection for handling the traffic H04W36/22; wireless traffic scheduling H04W72/12)} - H04W 48/04: based on user or terminal location or mobility data, e.g. moving direction, speed - H04L 67/141: Setup of application sessions (admission control or resource allocation in data switching networks H04L47/70) - H04L 67/142: Managing session states for stateless protocols; Signalling session states; State transitions; Keeping-state mechanisms - H04L 67/143: Termination or inactivation of sessions, e.g. event-controlled end of session - H04W 88/14: Backbone network devices - H04W 92/24: between backbone network devices - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method implemented in an access and mobility management function, AMF, node that implements at least one congestion control process is provided. A message including a first indication that the message is exempt from the at least one congestion control process is received by a UE. The message is forwarded to the SMF either with the exempt indication or, if this is missing, an indication that the AMF applies a congestion control. The SMF, only when receiving the forwarded message with the additional information inserted by the AMF, carries out a validation of the message of the UE, thus preventing that a UE tags a message to be exempted from congestion control, when it should be not be exempt. ## Claims ### Claim 1 An access and mobility management Function, AMF, node configured to enable at least one congestion control process, the AMF node comprising: processing circuitry configured to: receive a first message including a modification request message, the first message including a first indication indicating that the modification request message is exempt from the at least one congestion control process, the first indication being provided by a predefined request type included in the modification request message; forward the modification request message to a session management function, SMF, with a second indication indicating the at least one congestion control process is enabled at the AMF node; and receive, from the SMF, a notification of a determination of whether the first message is accepted, the determination being one of: the message being accepted based on the request type being for reporting Data Off status change; and rejected based on the request type being not for reporting Data Off status change. ### Claim 2 (depends on 1) The AMF node of claim 1, wherein the first message is a non-access stratum, NAS, message. ### Claim 3 (depends on 2) The AMF node of claim 2, wherein the processing circuitry is further configured to: receive a third indication that the modification request message has been accepted for exemption from the at least one congestion control process; and transmit a fourth indication to wireless device indicating that the modification request message has been accepted for exemption from the at least one congestion control process. ### Claim 4 (depends on 1) The AMF node of claim 1, wherein the modification request message is forwarded to the Session Management Function, SMF, for validation as to whether the modification request message is exempt from the at least one congestion control process. ### Claim 5 (depends on 1) The AMF node of claim 1, wherein the processing circuitry is further configured to: receive a third indication that the modification request message has been accepted for exemption from the at least one congestion control process; and transmit a fourth indication to wireless device indicating that the modification request message has been accepted for exemption from the at least one congestion control process. ### Claim 6 A method implemented in an access and mobility management function, AMF, node that is configured to enable at least one congestion control process, the method comprising: receiving a first message including a modification request message, the first message including a first indication indicating that the modification request message is exempt from the at least one congestion control process, the first indication being provided by a predefined request type included in the modification request message; forwarding the modification request message to a session management function, SMF, with a second indication indicating that at least one congestion control process is enabled at the AMF node; and receiving, from the SMF, a notification of a determination of whether the first message is accepted, the determination being one of: the message being accepted based on the request type being for reporting Data Off status change; and rejected based on the request type being not for reporting Data Off status change. ### Claim 7 (depends on 6) The method of claim 6, wherein the first message is a non-access stratum, NAS, message. ### Claim 8 (depends on 6) The method of claim 6, wherein the modification request message is forwarded to a Session Management Function, SMF, for validation as to whether the modification request message is exempt from the at least one congestion control process. ### Claim 9 (depends on 6) The method of claim 6, further comprising: receiving a third indication that the modification request message has been accepted for exemption from the at least one congestion control process; and transmitting a fourth indication to wireless device indicating that the modification request message has been accepted for exemption from the at least one congestion control process. ### Claim 10 A session management function, SMF, node, comprising: processing circuitry configured to: receive a first message including a modification request message, the first message including a first indication indicating that the modification request message is exempt from at least one congestion control process, the first indication being provided by a predefined request type included in the modification request message; receive a second indication with the modification request message, the second indication indicating at least one congestion control process is enabled at an access and mobility management function, AMF, node; validate that the modification request message is exempt from the at least one congestion control process; and notify the AMF node of the validation, the validation being one of: the message being accepted based on the request type being for reporting Data Off status change; and rejected based on the request type being not for reporting Data Off status change. ### Claim 11 A method implemented in a session management function, SMF, node, the method comprising: receiving a first message including a modification request message, the first message including a first indication indicating that the modification request message is exempt from at least one congestion control process, the first indication being provided by a predefined request type included in the modification request message; receiving a second indication with the modification request message, the second indication indicating at least one congestion control process is enabled at an access and mobility management function, AMF, node; validating that the modification request message is exempt from the at least one congestion control process; and notifying the AMF node of the validation, the validation being one of: the message being accepted based on the request type being for reporting Data Off status change; and rejected based on the request type being not for reporting Data Off status change. ### Claim 12 (depends on 11) The method of claim 11, wherein the first indication is provided with the modification request message when the at least one congestion control process is enabled at the AMF node.