Towards robust notification mechanism in 5G SBA

A method performed by a service consumer for subscription and notification of events in a core network of a cellular communications system in which the core network has a service-based architecture, the method comprising:

• generating first security information for a subscription to an event;
• sending a subscribe message to a service producer of the event, the subscribe message comprising the first security information;
• receiving a notification message from the service producer, the notification message comprising the event and second security information, the second security information comprising the first security information or information derived from the first security information;
• and
• verifying the notification message based on the first security information generated at the service consumer and the second security information comprised in the notification message.

A service consumer for subscription and notification of events in a core network of a cellular communications system in which the core network has a service-based architecture, the service consumer adapted to:

• generate first security information for a subscription to an event;
• send a subscribe message to a service producer of the event, the subscribe message comprising the first security information;
• receive a notification message from the service producer, the notification message comprising the event and second security information, the second security information comprising the first security information or information derived from the first security information;
• and
• verify the notification message based on the first security information generated at the service consumer and the second security information comprised in the notification message.

A method performed by a service producer for subscription and notification of events in a core network of a cellular communications system in which the core network has a service-based architecture, the method comprising:

• receiving a subscribe message from a service consumer for a subscription to an event, the subscribe message comprising first security information for the subscription to the event;
• storing the first security information in a subscription context for the subscription to the event by the service consumer;
• and
• sending a notification message to the service consumer, the notification message comprising the event and second security information, the second security information comprising the first security information or information derived from the first security information.

A service producer for subscription and notification of events in a core network of a cellular communications system in which the core network has a service-based architecture, the service producer adapted to:

• receive a subscribe message from a service consumer for a subscription to an event, the subscribe message comprising first security information for the subscription to the event;
• store the first security information in a subscription context for the subscription to the event by the service consumer;
• and
• send a notification message to the service consumer, the notification message comprising the event and second security information, the second security information comprising the first security information or information derived from the first security information.