3G UMTS

3GPP UMTS logo

Full Name

Universal Mobile Telecommunications System

DL Multiplexing

UL Multiplexing

Duplexing

Definition

Third generation of wireless communication technologies, which support broadband voice, data and multi-media communications over wireless networks.

Overview

UMTS is an umbrella term for the third generation radio technologies developed by the 3GPP. UMTS specifies a complete network system, for which the radio access component, known as UTRAN, uses WCDMA technology to offer greater spectral efficiency and bandwidth to mobile network operators. The system also includes the Core Network; the entity that interfaces to external networks including the public phone network and other cellular telecommunications networks.

While the UMTS standard supports both FDD and TDD duplexing, the overwhelming majority of 3G UMTS deployments use FDD frequency bands.

Packet Data Protocols

Since UMTS was introduced in 3GPP R99 the need for improved support for downlink data services has increased. High Speed Packet data Access (HSPA) has been an upgrade to WCDMA networks (FDD and TDD) used to increase packet data performance. The introduction was done in steps; High Speed Down Link (DL) Packet data Access (HSDPA), was introduced in 3GPP Release 5, and Enhanced Up Link (UL), also referred to as High Speed UL Packet data Access (HSUPA), came in Release 6.

The combination of HSDPA and HSUPA is referred to as HSPA. HSPA evolution known as HSPA+ came in Release 7 with further improvements in later releases.

Dual-Carrier HSPA+ capability was introduced by 3GPP in the Release 8 specifications, and enables a theoretical peak downlink data throughput capability of 42 Mbps. DC-HSPA+ systems combine 64QAM modulation and double the bandwidth by using dual carriers (2 x 5 MHz = 10 MHz). To improve uplink data rates, the implementation of 16QAM over QPSK modulation made it possible to double peak data rates to 11.5 Mbps. Dual-Carrier technology further extended uplink performance to 23 Mbps.

3G Switch-off

3G UMTS is beginning to reach an end-of-life status in many countries. Valuable spectrum is being refarmed into more spectrally efficient 4G and 5G networks.

UMTS Packet Data by Deployment

The chart below categorises active 3G networks by their HSPA mobile broadband evolution.

Deployed 3G Networks

The following chart shows the number of active 3G UMTS networks, distributed by operating frequency band. These data are rendered live and may update unexpectedly.

Key Articles

UMTS frequency bands are spectrum allocations dedicated to use for 3G Universal Mobile Telecommunications System networks. Bands are harmonised internationally via the 3GPP 25.101 standard.