Within the GPRS amount arrangement standards there are a amount of interfaces and advertence credibility (logical credibility of affiliation which apparently allotment a accepted concrete affiliation with added advertence points). Some of these names can be apparent in the arrangement anatomy diagram on this page.
edit Interfaces in the GPRS network
Ga
The interface serves the CDRs (accounting records) which are accounting in the GSN and beatific to the charging aperture (CG). This interface uses a GTP-based protocol, with modifications that supports CDRs (Called GTP' or GTP prime).
Gb
Interface amid the abject base subsystem and the SGSN the manual agreement could be Frame Relay or IP.
Gd
Interface amid the SGSN and the SMS Gateway. Can use MAP1, MAP2 or MAP3.
Ge
The interface amid the SGSN and the account ascendancy point (SCP); uses the CAP protocol.
Gf
The interface amid the SGSN and the Accessories Character Register (EIR), acclimated for blockage the mobile's accessories character amount (IMEI) adjoin a account of appear baseborn adaptable phones.
Gi
IP based interface amid the GGSN and a accessible abstracts arrangement (PDN) either anon to the Internet or through a WAP gateway.
Gmb
The interface amid the GGSN and the Broadcast-Multicast Account Center (BM-SC), acclimated for authoritative MBMS bearers.
Gn
IP Based interface amid SGSN and added SGSNs and (internal) GGSNs. DNS aswell shares this interface. Uses the GTP Protocol.
Gp
IP based interface amid centralized SGSN and alien GGSNs. Amid the SGSN and the alien GGSN, there is the bound aperture (which is about a firewall). Aswell uses the GTP Protocol.
Gr
Interface amid the SGSN and the HLR. Messages traveling through this interface uses the MAP3 protocol.
Gs
Interface amid the SGSN and the MSC (VLR). Uses the BSSAP+ protocol. This interface allows paging and base availability if it performs abstracts transfer. If the base is absorbed to the GPRS network, the SGSN keeps clue of which acquisition breadth (RA) the base is absorbed to. An RA is a allotment of a beyond breadth breadth (LA). If a base is paged this advice is acclimated to conserve arrangement resources. If the base performs a PDP context, the SGSN has the exact BTS the base is using.
Gx
The off-line action interface amid the GGSN and the charging rules action (CRF). It is acclimated for accessories account abstracts breeze based on charging rules. Uses the bore protocol.
Gy
The on-line charging interface amid the GGSN and the online charging arrangement (OCS). Uses the bore agreement (DCCA application).
Gz
The off-line (CDR-based) charging interface amid the GSN and the CG. Uses GTP'.
Lg
The interface amid the SGSN and the Aperture Adaptable Breadth Center (GMLC), acclimated for breadth based services.
edit Interfaces in the GPRS network
Ga
The interface serves the CDRs (accounting records) which are accounting in the GSN and beatific to the charging aperture (CG). This interface uses a GTP-based protocol, with modifications that supports CDRs (Called GTP' or GTP prime).
Gb
Interface amid the abject base subsystem and the SGSN the manual agreement could be Frame Relay or IP.
Gd
Interface amid the SGSN and the SMS Gateway. Can use MAP1, MAP2 or MAP3.
Ge
The interface amid the SGSN and the account ascendancy point (SCP); uses the CAP protocol.
Gf
The interface amid the SGSN and the Accessories Character Register (EIR), acclimated for blockage the mobile's accessories character amount (IMEI) adjoin a account of appear baseborn adaptable phones.
Gi
IP based interface amid the GGSN and a accessible abstracts arrangement (PDN) either anon to the Internet or through a WAP gateway.
Gmb
The interface amid the GGSN and the Broadcast-Multicast Account Center (BM-SC), acclimated for authoritative MBMS bearers.
Gn
IP Based interface amid SGSN and added SGSNs and (internal) GGSNs. DNS aswell shares this interface. Uses the GTP Protocol.
Gp
IP based interface amid centralized SGSN and alien GGSNs. Amid the SGSN and the alien GGSN, there is the bound aperture (which is about a firewall). Aswell uses the GTP Protocol.
Gr
Interface amid the SGSN and the HLR. Messages traveling through this interface uses the MAP3 protocol.
Gs
Interface amid the SGSN and the MSC (VLR). Uses the BSSAP+ protocol. This interface allows paging and base availability if it performs abstracts transfer. If the base is absorbed to the GPRS network, the SGSN keeps clue of which acquisition breadth (RA) the base is absorbed to. An RA is a allotment of a beyond breadth breadth (LA). If a base is paged this advice is acclimated to conserve arrangement resources. If the base performs a PDP context, the SGSN has the exact BTS the base is using.
Gx
The off-line action interface amid the GGSN and the charging rules action (CRF). It is acclimated for accessories account abstracts breeze based on charging rules. Uses the bore protocol.
Gy
The on-line charging interface amid the GGSN and the online charging arrangement (OCS). Uses the bore agreement (DCCA application).
Gz
The off-line (CDR-based) charging interface amid the GSN and the CG. Uses GTP'.
Lg
The interface amid the SGSN and the Aperture Adaptable Breadth Center (GMLC), acclimated for breadth based services.
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