Section: 28.10 Presence Reporting Area Identifier (PRA ID)
Content: The Presence Reporting Area Identifier (PRA ID) is used to identify a Presence Reporting Area (PRA). PRAs can be used for reporting changes of UE presence in a PRA, e.g. for policy control or charging decisions. See 3GPP TS 23.501[ System architecture for the 5G System (5GS) ]  [119] and 3GPP TS 23.503[ Policy and charging control framework for the 5G System (5GS); Stage 2 ]  [121]. A PRA is composed of a short list of TAs and/or NG-RAN nodes and/or cells identifiers in a PLMN.A PRA can be: - either a "UE-dedicated PRA", defined in the subscriber profile; - or a "Core Network predefined PRA", pre-configured in AMF. PRA IDs used to identify "Core Network predefined PRAs" shall not be used for identifying "UE-dedicated PRAs". The same PRA ID may be used for different UEs to identify different "UE-dedicated PRAs", i.e. PRA IDs may overlap between different UEs, while identifying different "UE-dedicated PRAs". The PRA ID shall be formatted as an integer within the following ranges: 0 .. 8 388 607 for UE-dedicated PRA 8 388 608 to 16 777 215 for Core Network predefined PRA. NOTE: The PRA ID is encoded over the Service Based Interfaces as a string of digits representing an integer. See 3GPP TS 29.571[ 5G System; Common Data Types for Service Based Interfaces; Stage 3 ]  [129].