What is 3G?
3G is the third generation of mobile telecommunications, standardized by the ITU under the IMT-2000 framework. It introduced true mobile broadband, enabling internet access, video calling, and multimedia services on mobile devices for the first time at speeds up to 42 Mbps (HSPA+).
How Does 3G Work?
Based on WCDMA (UMTS) in most of the world, 3G uses spread-spectrum techniques with a 5 MHz carrier. The HSPA evolution (HSDPA + HSUPA) introduced shared channels and adaptive modulation, pushing speeds from the initial 384 kbps to 42 Mbps downlink. Always-on IP connectivity replaced the circuit-switched data of 2G.
Use Cases
Mobile internet browsing, video calling (3G videophone), app-based services, mobile TV (MBMS), tethering. HSPA+ deployments bridged 3G performance toward early 4G capability.
3GPP / Standards Reference
3GPP TS 25-series (UTRAN — UMTS Terrestrial Radio Access Network)
Related Terms
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This glossary entry is part of the 5GWorldPro Complete 5G Glossary. To go deeper into 5G architecture and technology, explore our 5G Training courses.
