Technique for Maintaining a Subscription of a Subscriber NF

A method for maintaining a subscription of a subscriber Network Function (NF) for receiving events related to a User Equipment (UE) from a serving NF in a telecommunication system, the UE being served by a first instance of the serving NF, the method being performed by the first instance of the serving NF and comprising:

• receiving a subscription request from the subscriber NF, the subscription request including a persistence indication indicating that the subscription is to be maintained;
• triggering generating subscription restoration information enabling restoration of the subscription in case the first instance of the serving NF ceases serving the UE;
• and
• triggering storing the subscription restoration information in a data storage function of the telecommunication system in association with the UE, wherein the subscription restoration information is to be used by a second instance of the serving NF for restoring the subscription if the first instance of the serving NF ceases serving the UE.

A method for maintaining a subscription of a subscriber Network Function (NF) for receiving events related to a User Equipment (UE) from a serving NF in a telecommunication system, the UE being served by a first instance of the serving NF, the method being performed by a data storage function of the telecommunication system and comprising:

• receiving a request to store subscription restoration information in association with the UE, the subscription restoration information enabling restoration of the subscription in case the first instance of the serving NF ceases serving the UE;
• triggering storing the subscription restoration information;
• and
• triggering providing the stored subscription restoration information to a second instance of the serving NF, wherein the subscription restoration information is to be used by the second instance of the serving NF for restoring the subscription if the first instance of the serving NF ceases serving the UE.