A Unified Data Repository, UDR, in a Service Based Architecture, SBA, domain in a core network of a telecommunications system, said SBA comprising a Policy Control Function, PCF, an Application Function, AF and a Session Management Function, SMF, said UDR being arranged to support implementation of an application rule for an application to be accessed by a User Equipment, UE, in a user session in said SBA domain, said UDR comprising:
- receive equipment, arranged for receiving, from said PCF, said application rule applicable to said application to be accessed by said UE, said application rule being different from existing Policy Charging and Control, PCC, rules and having higher precedence than existing per session PCC rules;
- storage equipment, arranged for storing, said received application rule;
- said receive equipment being further arranged for receiving, from said PCF, a request for an application rule applicable to a user session, said request identifying an application to be accessed by said UE, and
- transmit equipment arranged for transmitting, to said PCF, said requested application rule stored in said storage equipment of said UDR.