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A 3G core network is the service and switching/data-network part of a UMTS mobile network, logically separate from the radio access network. It carries functions and traffic beyond the radio layer and connects mobile services to telephone and packet-data networks. In the classic UMTS architecture, its two main service domains are circuit-switched (CS) and packet-switched (PS).
What the term means
3GPP describes the public land mobile network (PLMN) infrastructure as logically divided into a core network (CN) and an access network (AN). In UMTS, the access network is the Radio Network Subsystem (RNS), commonly called UTRAN. The core provides network-side service functions beyond that access layer.
This is a logical architecture, not a required arrangement of physical boxes. Specifications define functional entities and how they fit into network domains; operators may implement them across different equipment arrangements. The core is not the cell towers, UTRAN, or the entire end-to-end mobile network.
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What the two core domains do
| Domain | Traffic model | Representative functions and nodes |
|---|---|---|
| Circuit-switched (CS) | Supports connection-oriented user traffic. In the Release 6 architecture, dedicated network resources are allocated for a connection and released when it ends. | MSC-family functions, including the MSC, GMSC, and VLR, support call handling and interworking with external circuit-switched networks. |
| Packet-switched (PS) | Carries user information as packets, along with the signalling functions that support packet service. | The SGSN supports mobile packet sessions and mobility-related functions; the GGSN provides the gateway toward external packet-data networks. |
Circuit-switched service
The CS domain is the part associated with connection-oriented service such as traditional voice calling. Its Mobile Switching Centre (MSC) family handles call setup and interworking toward external circuit-switched networks. The Gateway MSC (GMSC) and Visitor Location Register (VLR) are also named CS-domain entities in the architecture.
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Packet-switched service
The PS domain handles packet data. The Serving GPRS Support Node (SGSN) serves mobile packet sessions and related mobility functions. The Gateway GPRS Support Node (GGSN) connects the packet core toward external data networks. The IETF’s RFC 3314 describes the GGSN as a specialized router serving as a gateway to external networks and lists authentication, authorization, mobility management, and billing-information collection among SGSN functions.
Where the core begins: UTRAN versus the core
UTRAN is the UMTS radio access network: it provides the radio-side link between a mobile station and the network. The core is the network-side architecture beyond that access layer, where the service domains and their connections to other networks reside. So, if a question is whether a radio base station is “the core,” the distinction is no: it belongs on the access side, while core functions handle service and network connectivity beyond it.
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How “3G core” differs from LTE/EPC
“3G core” is often used to mean the UMTS/GPRS architecture, but later 3GPP specifications cover LTE/Evolved Packet System (EPS) as well. Release 11 TS 23.002 describes CS, PS, and an IP Multimedia (IM) subsystem in the broader core-network architecture; it associates SGSN/GGSN with GPRS and MME, Serving Gateway, and PDN Gateway with EPS. LTE’s Evolved Packet Core (EPC) is a later architecture, not another name for the original UMTS core.
IMS is an additional architecture and service context, not a necessary part of a basic definition. For a first-pass description, the CS-versus-PS distinction is the clearest starting point.
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Scope and specification context
“3G” covers more than one standards family. The architecture and node names described here refer specifically to UMTS, the 3GPP mobile-network architecture. 3GPP TS 23.002 Release 6, version 6.8.0, provides the UMTS definitions used here; the edition dates to the 2005 era. Release 11, version 11.6.0, marked June 2013 by ETSI, includes LTE/EPS alongside UMTS. These documents establish architecture and terminology, not a current inventory of what every operator deploys. Not every network necessarily deployed every listed function.
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- ETSI/3GPP TS 23.002 v6.8.0, Release 6: Network architecture
- ETSI/3GPP TS 23.002 v11.6.0, Release 11: Network architecture
- IETF RFC 3314: Recommendations for IPv6 in 3GPP Standards
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