3 Definitions, symbols and abbreviations

32.2523GPPCharging managementRelease 9Telecommunication managementTSWireless Local Area Network (WLAN) charging

3.1 Definitions

For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 [50], 3GPP TS 32.240 [1], 3GPP TS 22.934 [200], 3GPP TS 23.234 [201] and the following apply:

Billing Domain (BD): part of the operator network, which is outside the core network that receives and processes charging information from the core network charging functions.
It includes functions that can provide billing mediation and billing end applications.

Interworking WLAN (I-WLAN): a WLAN that interworks with a 3GPP system.

Offline Charging: charging mechanism where charging information does not affect, in real-time, the service rendered.

Online Charging: charging mechanism where charging information can affect, in real-time, the service rendered and therefore a direct interaction of the charging mechanism with bearer/session/service control is required.

PS based services: in WLAN interworking, PS based service is a general term to refer to the services provided by a PLMN using IP bearer capability between WLAN UEs and the PLMN in scenario 3 and upwards
They include all services provided by 3G PS domain that use the IP bearer service (e.g. IMS, Internet access, Corporate IP network access), and other services (e.g., SMS and LCS).

WLAN: Wireless LAN.

WLAN-attach status: indicates whether a UE is WLAN-attached or not
A WLAN UE is "WLAN-attached" after successful authentication and WLAN Access Authorization. A WLAN UE is "WLAN-detached" after its disconnection, or its authentication or WLAN access authorisation being cancelled.

Home Agent Access Point Name (HA-APN): is used to identify a specific PDN and a point of interconnection to that network (Home Agent).

3.2 Symbols

For the purposes of the present document, the following symbols apply:

Rf Offline charging reference point between a 3G network element and the CDF

Ro Online charging reference point between a 3G network element and the OCS

D’ Reference point between a pre-R6 HSS/HLR and a 3GPP AAA Server

Dw Reference point between a 3GPP AAA Server and an SLF

Gr’ Reference point between a pre-R6 HSS/HLR and a 3GPP AAA Server

Wa Reference point between a WLAN Access Network and a 3GPP AAA Server/Proxy (charging and control signalling)

Wd Reference point between a 3GPP AAA Proxy and a 3GPP AAA Server (charging and control signalling)

Wf Reference point between an Offline Charging System and a 3GPP AAA Server/Proxy

Wg Reference point between a 3GPP AAA Server/Proxy and WAG

Wi Reference point between a Packet Data Gateway and an external IP Network

Wm Reference point between a Packet Data Gateway and a 3GPP AAA Server or 3GPP AAA proxy

Wn Reference point between a WLAN Access Network and a WLAN Access Gateway

Wp Reference point between a WLAN Access Gateway and a Packet Data Gateway

Wo Reference point between a 3GPP AAA Server and an OCS

Wu Reference point between a WLAN UE and a Packet Data Gateway

Wx Reference point between an HSS and a 3GPP AAA Server

3.3 Abbreviations

For the purposes of the present document, the abbreviations defined in 3GPP TR 21.905 [50], 3GPP TS 22.934 [200], 3GPP TS 23.234 [201], 3GPP TS 23.934 (see bibliography), 3GPP TS 32.240 [1] and the following apply:

3GPP 3rd Generation Partnership Project

BD Billing Domain

CDR Charging Data Record

EPS Evolved Packet Systems

GGSN Gateway GPRS Support Node

GTP GPRS Tunnelling Protocol

I‑WLAN Interworking WLAN

IP Internet Protocol

LAN Local Area Network

PS Packet Switche

PDP Packet Data Protocol, e.g. IP

SGSN Serving GPRS Support Node

TS Technical Specification

UMTS Universal Mobile Telecommunications System

WLAN Wireless LAN