3 Definitions and abbreviations

29.2143GPPPolicy and charging control over Rx reference pointRelease 17TS

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 application(s) that use IP bearer resources

NOTE: One example of an AF is the P-CSCF of the IM CN subsystem.

AF Session: application level 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.

Attribute-Value Pair (AVP): See ETF RFC 6733 [52], corresponds to an Information Element in a Diameter message.

Binding: PCRF process of associating IP flows described in AF Service Information with IP-CAN bearers.

Bit rate: The number of bits (denoted in units of bits, kbits, etc.) that are conveyed or processed per unit of time. The bit rate in bit/s can be abbreviated with bps. This specification uses SI (International System of Units) prefixes as unit prefixes, which strictly refer to the power of 10, and shall not be used for the power of 2. For example, 1 kbit/s represents 1000 bit/s or 1 Mbit/s represents 1000 kbit/s and so on.

IP-CAN bearer: IP transmission path of defined capacity, delay and bit error rate, etc.
See 3GPP TR 21.905 [1] for the definition of bearer.

IP-CAN session: association between a UE and an IP network (for GPRS, APN).
The association is identified by one UE Ipv4 address and/or one Ipv6 prefix together with a UE identity information, if available, and a PDN represented by a PDN ID (e.g. an APN). An IP-CAN session incorporates one or more IP-CAN bearers. Support for multiple IP-CAN bearers per IP-CAN session is IP-CAN specific. An IP-CAN session exists as long as the related UE Ipv4 address and/or Ipv6 prefix are assigned and announced to the IP network.

IP flow: unidirectional flow of IP packets with the same source IP address and port number and the same destination IP address and port number and the same transport protocol
Port numbers are only applicable if used by the transport protocol.

MPS session: A session for which priority treatment is applied for allocating and maintaining radio and network resources to support the Multimedia Priority Service (MPS). MPS is defined in 3GPP TS 22.153 [31].

Packet flow: A specific user data flow carried through the PCEF. A packet flow can be an IP flow.

PCC rule: set of information enabling the detection of a service data flow and providing parameters for policy control and/or charging control.

RESTful HTTP: is an architectural style consisting of a coordinated set of architectural constraints applied to components, connectors, and data elements, within a distributed hypermedia system applied to the development of web services.

Restricted local operator services: communication services provided by an operator that involve either automated or human assistance (e.g. credit card billing, directory assistance, customer care) for which successful authentication is not necessary.

service information: set of information conveyed from the AF to the PCRF over the Rx interface to be used as a basis for PCC decisions at the PCRF, including information about the AF session (e.g. application identifier, type of media, bandwidth, IP address and port number).

service data flow: An aggregate set of packet flows.

3.2 Abbreviations

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

5GMM 5G Mobility Management protocol

5GS 5G System

5GSM 5G Session Management protocol

ADC Application Detection and Control

AF Application Function

AS Application Server

ASP Application Service Provider

ATSSS Access Traffic Steering, Switching and Splitting

AVP Attribute Value Pair

BBF Broadband Forum

CHEM Coverage and Handoff Enhancements using Multimedia error robustness feature

CRF Charging Rules Function

DRMP Diameter Routing Message Priority

DSCP Differentiated Services Code Point

DTS Data Transport Service

DSL Digital Subscriber Line

FLUS Framework for Live Uplink Streaming

GCS Group Communication Service

GCS AS Group Communication Service Application Server

HFC Hybrid Fiber Coax

IP-CAN IP Connectivity Access Network

MA Multi-Access

MPS Multimedia Priority Service

N3IWF Non-3GPP Interworking Function

N5CW Non-5G-Capable over WLAN

NGAP NG Application Protocol

NID Network Identifier

PCC Policy and Charging Control

PCEF Policy and Charging Enforcement Function

PCF Policy Control Function

PCRF Policy and Charging Rule Function

PDF Policy Decision Function

P-CSCF Proxy-Call Session Control Function

PON Passive Optical Network

PSAP Public Safety Answering Point

QoS Quality of Service

RCAF RAN Congestion Awareness Function

RLOS Restricted Local Operator Services

SCEF Service Capability Exposure Function

SCS Service Capability Server

SDF Service Data Flow

SMF Session Management Function

SNPN Stand-alone Non-Public Network

SPR Subscriber Profile Repository

TDF Traffic Detection Function

TNAP Trusted Non-3GPP Access Point

TNGF Trusted Non-3GPP Gateway Function

TWAP Trusted WLAN Access Point

TWIF Trusted WLAN Interworking Function

UDC User Data Convergence

UE User Equipment

UDR User Data Repository

XML Extensible Markup Language