для Cisco Cisco Packet Data Gateway (PDG)
GTPP Accounting Overview
▀ GTPP Interface Overview
▄ GTPP Interface Administration and Reference, StarOS Release 18
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GTPP Interface Overview
This section provides information on GTPP interface between Charging Gateway Function (CGF) and Cisco Systems’
licensed products running on the ASR 5x00 core platforms, including the GGSN, P-GW, S-GW, and SGSN in General
Packet Radio Service (GPRS), Universal Mobile Telecommunications System (UMTS) data networks, 3GPP2 evolved
High Rate Packet Data (eHRPD) and Long Term Evolution-System Architecture Evolution (LTE-SAE) wireless data
networks.
licensed products running on the ASR 5x00 core platforms, including the GGSN, P-GW, S-GW, and SGSN in General
Packet Radio Service (GPRS), Universal Mobile Telecommunications System (UMTS) data networks, 3GPP2 evolved
High Rate Packet Data (eHRPD) and Long Term Evolution-System Architecture Evolution (LTE-SAE) wireless data
networks.
The Ga is the reference point from Charging Data Function (CDF) to the CGF, which is intended for the transport of
CDRs. The CDF could either be GGSN, P-GW, S-GW, or any other similar products.
CDRs. The CDF could either be GGSN, P-GW, S-GW, or any other similar products.
By definition, dealing with CDRs only implies that Ga is solely related to offline charging.
The following figure depicts the position of the Ga reference point within the overall 3GPP offline charging
architecture.
architecture.
Figure 1.
3GPP Offline Charging Architecture
As illustrated in the above figure, the CDF in each network domain, service or subsystem is relevant for the network
side of the Ga reference point. Different mappings of the ubiquitous offline charging functions, CDF and CGF, onto
physical implementations are possible.
side of the Ga reference point. Different mappings of the ubiquitous offline charging functions, CDF and CGF, onto
physical implementations are possible.
The transport protocol associated to the Ga reference point, providing functions for transfer of CDRs from CDF to CGF,
is GTPP.
is GTPP.
Each CDF will have an O&M configurable address list of CGFs (Charging Gateways) to which it can send its CDRs.
The list will be organized in CGF address priority order. If the primary CGF is not available (for example, out of
service), then the CDF will send the CDRs to the secondary CGF and so on.
The list will be organized in CGF address priority order. If the primary CGF is not available (for example, out of
service), then the CDF will send the CDRs to the secondary CGF and so on.
Each CDR generating function will only send the records to the CGF(s) of the same PLMN, not to CGF(s) located in
other PLMNs.
other PLMNs.
Each CGF in the PLMN will know the other CGFs' network addresses (for example, for redundancy reasons, to be able
to recommend another CGF address). This is achieved by O&M configuration facilities that will enable each CGF to
have a configurable list of peer CGF addresses.
to recommend another CGF address). This is achieved by O&M configuration facilities that will enable each CGF to
have a configurable list of peer CGF addresses.