Congestion control in AMF and SMF

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.

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.

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.