Abstract: A method for network function discovery in a communication network is provided. The method includes receiving a discovery request from a first network function NF to request one or more NF instance of a first group type for a first subscriber. The discovery request may include a first group type identifier of the first group type. The method may further include determining one or more group identifier for one or more groups of NF instances managing the first subscriber. The one or more groups of NF instances are of the first group type and one or more other group types. The method may further include sending a discovery response to the first network function, including the one or more group identifiers and addressing information to reach the one or more groups of NF instances.