A PDR contains information required to classify a packet arriving at a UP function, e.g. a TDF-U, a PGW-U or a SGW-U. There will be at least one PDR for both the uplink and the downlink. The PDR will contain various amounts of information depending upon the user function type. This will include a unique session and rule identity and also packet detecton information such as source information, service data flow filter and application identity.