3GPP Release 4 Architecture 1. Access Network EntitiesBase Station Subsystem - BSC – Base Station Controller
- BTS – Base Transceiver Station
Radio Network Subsystem - RNC – Radio Network Controller
- Node B
2. Core Network EntitiesEntities in both PS and CS domains - HLR – Home Location Register
- VLR – Visitor Location Register
- AuC – Authentication Centre
- EIR – Equipment Identity Register
- SGW – Signalling Gateway Function
Entities in the CS domains - MSC – Mobile service Switching Centre
- MSC Server – Mobile service Switching Centre Server
- CS-MGW – Circuit Switched Media Gateway Function
- GMSC – Gateway MSC
- GMSC Server – Gateway MSC Server
Entities in the PS domains - SGSN – Serving GPRS Support Node
- GGSN – Gateway GPRS Support Node
3. Network InterfacesMobile terminal and mobile network interfaces - Um-interface: Interface between the mobile terminal and the BSS.
- Uu-interface: Interface between the mobile terminal and the RNS.
Access network interfaces - Abis-interface: Interface between the BSC and the BTS.
- Iubis-interface: Interface between the RNC and the Node B.
- Iur-interface: Interface between two RNCs.
CS core network and access network interfaces - A-interface: Interface between the MSC and the BSS.
- IuCS-interface: Interface between the MSC and the RNS.
CS core network interfaces - B-interface: Interface between the MSC and its associated VLR.
- C-interface: Interface between the HLR and the MSC.
- D-interface: Interface between the HLR and the VLR.
- E-interface: Interface between MSC servers.
- F-interface: Interface between the MSC and the EIR.
- G-interface: Interface between VLRs.
- H-interface: Interface between the HLR and the AuC.
- Nb-interface: Call control interface between two MSC servers or MSC server and GMSC server.
- Nc-interface: Bearer control interface between two CS-MGWs.
- Mc-interface:Interface between the (G)MSC server and the CS-MGW.
PS core network and access network interfaces - Gb-interface: Interface between the SGSN and the BSS.
- IuPS-interface: Interface between the SGSN and the RNS.
PS core network interfaces - Gr-interface: Interface between the SGSN and the HLR.
- Gn-interface: Interface between the SGSN and the GGSN, in the same PLMN.
- Gp-interface: Interface between the SGSN and the GGSN, in different PLMNs.
- Gc-interface: Interface between the GGSN and the HLR.
- Gf-interface: Interface between the SGSN and the EIR.
- Gi-interface: Interface between the GGSN and external data networks.
- Gs-interface: Interface between the SGSN and the MSC/VLR.
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