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specified from  Rel-7  in
TS 23.203, clause 6.2.2 

The PCEF encompasses service data flow detection, policy enforcement and flow based charging functionalities. This functional entity is located at the Gateway (e.g. GGSN in the GPRS case, and PDG in the WLAN case). It provides service data flow detection, user plane traffic handling, triggering control plane session management (where the IP-CAN permits), QoS handling, and service data flow measurement as well as online and offline charging interactions.


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specified from  Rel-15  in
TS 23.501, clause 6.2.4 

This network function exposes the Npcf service.


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specified from  Rel-7  in
TS 23.203, clause 6.2.1 

The PCRF encompasses policy control decision and flow based charging control functionalities. It provides network control regarding the service data flow detection, gating, QoS and flow based charging (except credit management) towards the PCEF and/or TDF. It provides network control regarding the application detection, gating, QoS and application based charging (except credit management) towards the TDF and the PCEF enhanced with ADC. It applies the security procedures, as required by the operator, before accepting service information from the AF.


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specified from  Rel-5  in
TS 23.228, clause 4.6.1 

The P-CSCF is the first contact point within the IM Core Network subsystem. Its address is discovered by UEs using procedures based on DNS/DHCP. The P-CSCF behaves like a SIP Proxy, i.e. it accepts requests and services them internally or forwards them on.


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specified from  Rel-5  to  Rel-6  in
TS 29.207 

The PDF acts as a Policy Decision Point for service based local policy control. The PDF makes the policy decisions based on the session and media related information obtained from the AF via the Gq interface. The PDF shall exchange the decision information with the GGSN via the Go interface.


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defined from  Rel-6
Source:   TS 23.002, clause 4a.13.5 

The PDG provides access to PS based services for a WLAN UE. It resides either in the home (for access to home services) or in the visited 3GPP network (for access to local services).


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specified from  Rel-14  in
TS 23.203, clause 6.2.13
TS 29.251 

The PFDF (Packet Flow Description Function) is a functional element which stores PFDs associated with application identifier (s) and transfers them to the PCEF via Gw interface to enable the PCEF to perform accurate application detection when the PFDs are managed by a 3rd party service provider.


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specified from  Rel-8  in
TS 23.401, clause 4.4.3.3 

The PDN GW is the gateway which terminates the SGi interface towards the PDN.

See Subscriber Data in the P-GW   here.


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defined in
TS 23.002, clause 3.1 

A PLMN is established and operated by an administration or Recognized Private Operating Agency (RPOA) for the specific purpose of providing land mobile telecommunications services to the public. The PLMN infrastructure is logically divided into a Core Network (CN) and an Access Network (AN) infrastructures.


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specified from  Rel-6  in
TS 23.271, clause 6.3.12 

The pseudonym mediation device (PMD) functionality maps or decrypts the pseudonym into the corresponding verinym (i.e. IMSI or MSISDN). PMD functionality may be a standalone network entity or the PMD functionality may be integrated in PPR, GMLC or other network entity. If PMD functionality is not part of GMLC it may be accessed using the Lid interface.


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specified from  Rel-6  in
TS 24.141, clause 5.3.5 

The PNA collects presence information about the presentity from a number of core network entities. The PNA can combine information from various core network entities to form more complete presence information.


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specified from  Rel-6  in
TS 23.271, clause 6.3.11 

Privacy check may be done in the privacy profile register. The HLR or HSS contains the address to the PPR. The PPR is accessible from the H-GMLC via the Lpp interface. PPR may be a standalone network entity or the PPR functionality may be integrated in H-GMLC.


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specified from  Rel-6  in
TS 23.141, clause 5.5 

The Presence List Server stores grouped lists of watched presentities and enables a Watcher Application to subscribe to the presence of multiple presentities using a single SUBSCRIBE transaction. The Presence List Server is implemented as a SIP Application Server function. For the case where the Watcher Application resides in an IMS UE, the Presence List Server may support the Ut reference point to allow the user to manage his presence lists.


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specified from  Rel-6  in
TS 23.141, clause 5.4 



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specified from  Rel-6  in
TS 23.141, clause 5.3.3 



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specified from  Rel-12  in
TS 23.303, clause 4.4.4 

The ProSe Application Server supports the following capability:
  • Storage of EPC ProSe User IDs and ProSe Function IDs;
  • Mapping of Application Layer User IDs and EPC ProSe User IDs.


See Subscriber Data in the ProSe AS   here.


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specified from  Rel-12  in
TS 23.303, clause 4.4.1 

The ProSe Function is the logical function that is used for network related actions required for ProSe. The ProSe Function plays different roles for each of the features of ProSe. In this version of the specification it is assumed that there is only one logical ProSe Function in each PLMN that supports Proximity Services.

See Subscriber Data in the ProSe Function   here.


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specified from  Rel-12  in
TS 23.303, clause 4.4.2 

Any ProSe-enabled UE may support the following functions:
  • Exchange of ProSe control information between ProSe-enabled UE and the ProSe Function over PC3 reference point.
  • Procedures for open ProSe Direct Discovery of other ProSe-enabled UEs over PC5 reference point.


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defined from  Rel-6
Source:   TS 24.141, clause 5.3.3 

A PS is an entity that accepts, stores, and distributes presence information.


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defined in
TS 23.002, clause 3.3.2 

The PS domain refers to the set of all the CN entities offering "PS type of connection" for user traffic as well as all the entities supporting the related signalling. A "PS type of connection" transports the user information using autonomous concatenation of bits called packets: each packet can be routed independently from the previous one.


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specified from  Rel-6  in
TS 24.141, clause 5.3.1 

A PUA is an entity that provides user-related presence information to a Presence Server.



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