3 Definitions and abbreviations

29.2093GPPPolicy control over Gq interfaceRelease 6TS

3.1 Definitions

For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 [1] and the following apply:

Application Function (AF): element offering applications that require the control of IP bearer resources.

NOTE: The AF is capable of communicating with the PDF to transfer dynamic QoS-related application information. One example of an AF is the P-CSCF of the IM CN subsystem.

AF session: established by an application level signalling protocol offered by the AF that requires a session set-up with explicit session description before the use of the service

NOTE: One example of an application session is an IMS session.

AF session signalling: used to control the AF session

NOTE: One example of AF session signalling is SIP/SDP.

Attribute-Value Pair (AVP): See RFC 3588 [6], corresponds to an Information Element in a Diameter message.

3.2 Abbreviations

For the purpose of the present document, the abbreviations given in 3GPP TR 21.905 [1] and the following apply:

AAA AA-Answer

AAR AA-Request

AF Application Function

ASA Abort-Session-Answer

ASR Abort-Session-Request

AVP Attribute-Value Pair


IANA Internet Assigned Numbers Authority

NASREQ Network Access Server Application

P-CSCF Proxy – Call Session Control Function

PDF Policy Decision Function

RAA Re-Auth-Answer

RAR Re-Auth-Request

SBLP Service Based Local Policy

SDI Session Description Information

STA Session-Termination-Answer

STR Session-Termination-Request