A method of providing a Packet Flow Descriptor (PFD) to a session management function (SMF) in a telecommunication network, wherein said telecommunication network is able to support network slicing, wherein said telecommunication network comprises a Packet Flow Description Function (PFDF) for hiding a topology of said telecommunication network from Application Service Providers (ASPs) and wherein said PFDF is shared among slices of said telecommunication network, said method comprises the steps of:
- receiving, by said PFDF, from an ASP, a PFD;
- storing, by said PFDF, said PFD in a Unified Data Repository (UDR) comprised by said telecommunication network, wherein said PFD is stored with identifications of corresponding applicable slices in said UDR;
- receiving, by said PFDF, from a Session Management Function (SMF) a request for PFDs that apply to a particular slice, wherein said received request comprises an identification of said particular slice;
- retrieving, by said PFDF, from said UDR said PFD that applies to said particular slice;
- and
- providing, by said PFDF, said retrieved PFD to said SMF.