A PRA list is a list of areas in which user equipment presence is reported to the PCRF. PRA lists are used to create location-specific policies that are triggered and applied whenever the user equipment either enters or leaves a PRA. PRA list areas can be designated with various types of value, including tracking area identities (TAI), routing area identities (RAI), Macro eNodeB, Home eNodeB, E-UTRAN cell global identities (ECGI), service area identities (SAI), and cell global identities (CGI).
You can create two types of PRA list: Core Network pre-configured and UE-dedicated. A Core Network pre-configured PRA list is defined on the MME/SSGN side and is used by the CMP in policies. Core Network pre-configured PRA lists are used to create area-specific policies that apply to all or many subscribers on a network. A UE-dedicated PRA list is defined either in the CMP or in subscriber profiles. UE-dedicated PRA lists are used to create area-specific policies that apply to small groups of subscribers on a network.