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Release 99 Architecture Print

3GPP Release 99 Architecture


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1. Access Network Entities

Base Station Subsystem
  • BSC – Base Station Controller
  • BTS – Base Transceiver Station

Radio Network Subsystem
  • RNC – Radio Network Controller
  • Node B

2. Core Network Entities

Entities in both PS and CS domains
  • HLR – Home Location Register
  • VLR – Visitor Location Register
  • AuC – Authentication Centre
  • EIR – Equipment Identity Register

Entities in the CS domains
  • MSC – Mobile service Switching Centre
  • GMSC – Gateway MSC

Entities in the PS domains
  • SGSN – Serving GPRS Support Node
  • GGSN – Gateway GPRS Support Node

3. Network Interfaces

Mobile 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.
  • Iub-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 MSCs.
  • F-interface: Interface between the MSC and the EIR.
  • G-interface: Interface between VLRs.
  • H-interface: Interface between the HLR and the AuC.

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.

4. Radio Access Network (RAN) Architecture

The UMTS RAN (or UTRAN) was designed around the following principles:
  • Logical separation of signalling and data transport networks.
  • UTRAN and CN functions are fully separated from transports functions.
  • Macro diversity (FDD only) is fully handled in the UTRAN.
  • Mobility for RRC connection is fully controlled by the UTRAN.
  • The functional division across the interfaces shall have as few options as possible.
  • Interfaces should be based on a logical model of the entity controlled through this interface.
  • One physical network element can implement multiple logical nodes.
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