# UMTS

**UMTS** (Universal Mobile Telecommunications System) is a third-generation (3G) mobile communications standard, defined within the ITU's IMT-2000 framework as the family member "GSM evolved UMTS core network" and built on the Wideband Code Division Multiple Access (WCDMA) radio interface.<sup>[1](https://www.itu.int/ITU-T/recommendations/rec.aspx?rec=Q.1741.7)</sup><sup> • </sup><sup>[2](https://www.itu.int/dms_pub/itu-d/opb/stg/D-STG-SG02.18-2006-R1-PDF-E.pdf)</sup> It was developed by the 3rd Generation Partnership Project (3GPP) as the evolutionary path from GSM, and its first commercial network was launched by NTT DoCoMo in Japan on 1 October 2001 under the FOMA brand.<sup>[3](https://www.umtsworld.com/news/history.htm)</sup>

| Key fact | Detail |
|---|---|
| Standard family | IMT-2000 family member "GSM evolved UMTS core network"; releases are referenced in the ITU-T Q.1741.x series, with Release 9 identified in Q.1741.7 (approved 29 November 2011)<sup>[1](https://www.itu.int/ITU-T/recommendations/rec.aspx?rec=Q.1741.7)</sup> |
| Radio interface | IMT-2000 CDMA Direct Spread, commonly known as WCDMA (UMTS); one of five IMT-2000 terrestrial radio interfaces based on FDMA, TDMA, and CDMA techniques<sup>[2](https://www.itu.int/dms_pub/itu-d/opb/stg/D-STG-SG02.18-2006-R1-PDF-E.pdf)</sup> |
| Initial data rate | WCDMA offers data services with bit rates of up to 2 Mbps and varying quality-of-service requirements<sup>[4](https://www.sciencedirect.com/science/chapter/bookseries/pii/S1388343701801463)</sup> |
| First commercial launch | NTT DoCoMo, Japan, 1 October 2001 (FOMA); first commercial UMTS network in Europe by Telenor, Norway, 1 December 2001<sup>[3](https://www.umtsworld.com/news/history.htm)</sup> |
| HSDPA enhancement | End-user data rates initially boosted to 3.6 Mbps, up to a peak theoretical 14.4 Mbps per user, with cell data capacity increased by up to a factor of 5 in dense urban environments<sup>[5](https://www.3gpp.org/ftp/pcg/pcg_15/docs/pdf/PCG15_22.pdf)</sup> |
| Spectrum | Release 99 UMTS specified primarily for the 2100 MHz band, with WCDMA carriers surrounded by GSM carriers in a "sandwich" arrangement<sup>[6](https://www.3gpp.org/ftp/tsg_ran/tsg_ran/tsgr_13/docs/PDFs/RP-010672.pdf)</sup> |
| End of service | UK 3G networks fully switched off by all four mobile network operators; Verizon retired its 3G CDMA network on 31 December 2022<sup>[7](https://www.ofcom.org.uk/phones-and-broadband/coverage-and-speeds/2g-and-3g-switch-off-our-expectations-of-mobile-providers?language=en)</sup><sup> • </sup><sup>[8](https://www.verizon.com/business/support/services-and-apps/cdma-network-retire/?os=i)</sup> |

## Standards context

UMTS belongs to IMT-2000, the ITU framework for global 3G mobile systems. In 1990 the ITU published a recommendation outlining the future of global mobile systems under the IMT-2000 name, and at the [World Radiocommunication Conference](https://www.edgepedia.org/world-radiocommunication-conference) in 2000 member states approved the technical specifications for IMT-2000, enabling worldwide deployment of third-generation networks.<sup>[9](https://www.itu.int/160/our-history/1990s-2020s/)</sup> The IMT-2000 terrestrial radio interfaces, specified in ITU-R Recommendation M.1457, accommodate five interfaces based on three access techniques: CDMA Direct Spread (WCDMA, UMTS), CDMA Multi-Carrier (CDMA2000), CDMA TDD (UTRA TDD and TD-SCDMA), TDMA Single Carrier (UWC-136/EDGE), and FDMA/TDMA (DECT).<sup>[2](https://www.itu.int/dms_pub/itu-d/opb/stg/D-STG-SG02.18-2006-R1-PDF-E.pdf)</sup>

Within the ITU-T Q.174x series, each 3GPP release of the "GSM evolved UMTS core network" family member is associated with a global Recommendation: Releases 99, 4, 5, 6, 7, and 8 in Q.1741.1 through Q.1741.6, and Release 9 in Q.1741.7, which combines core network standards from the standards development organizations ARIB, CCSA, ETSI, ATIS, TTA, and TTC.<sup>[1](https://www.itu.int/ITU-T/recommendations/rec.aspx?rec=Q.1741.7)</sup>

## Architecture

The UMTS system consists of three main entities: User Equipment (UE), the UMTS Terrestrial Radio Access Network (UTRAN), and a Core Network, connected through the Uu radio interface between UE and UTRAN and the Iu interface between UTRAN and the core network.<sup>[10](https://www.etsi.org/deliver/etsi_ts/125300_125399/125301/07.02.00_60/ts_125301v070200p.pdf)</sup> A UMTS network is operated by a single operator and consists of UTRAN access networks using WCDMA and/or TD-CDMA, optionally GSM BSS access networks, and a UMTS core network.<sup>[11](https://www.3gpp.org/ftp/TSG_SA/TSG_SA/TSGS_08/Docs/PDF/SP-000209.pdf)</sup> The radio protocols are grouped into an Access Stratum, which offers General Control, Notification, and Dedicated Control service access points to the Non-Access Stratum above it.<sup>[10](https://www.etsi.org/deliver/etsi_ts/125300_125399/125301/07.02.00_60/ts_125301v070200p.pdf)</sup>

The WCDMA air interface is an interference-limited system: capacity depends on the interference generated by users in the serving and neighboring cells, so WCDMA systems require tight power control to reduce interference and maximize capacity.<sup>[4](https://www.sciencedirect.com/science/chapter/bookseries/pii/S1388343701801463)</sup><sup> • </sup><sup>[12](https://link.springer.com/article/10.1186/s13638-015-0420-4)</sup> [Soft handover](https://www.edgepedia.org/soft-handover), in which a user communicates with multiple cells simultaneously, is a characteristic feature of the system, and tuning of soft handover and power control parameters is used to balance uplink and downlink capacity.<sup>[13](https://www.researchgate.net/publication/4281668_Automated_Up-_and_Downlink_Capacity_Balancing_in_WCDMA_Networks)</sup>

## Releases and evolution

The first 3GPP release, Release 1999, consolidated the underlying GSM specifications and developed the new UTRAN radio access network, laying the foundations for high-speed traffic transfer in both circuit-switched and packet-switched modes.<sup>[14](https://www.3gpp.org/specifications-technologies/releases/release-1999)</sup> Release 4 followed in March 2001, when 3GPP approved the UMTS Release 4 specification.<sup>[3](https://www.umtsworld.com/news/history.htm)</sup>

**Release 5 and HSDPA.** Release 5 introduced IP transport into the radio access network, increased data speeds by an order of magnitude through the High Speed Downlink Packet Access (HSDPA) feature, and specified the [IP Multimedia Subsystem](https://www.edgepedia.org/ip-multimedia-subsystem) (IMS) in the core network for integrating real-time and non-real-time services.<sup>[5](https://www.3gpp.org/ftp/pcg/pcg_15/docs/pdf/PCG15_22.pdf)</sup> HSDPA was designed as an add-on at incremental cost for operators of Release 99/Release 4 network architectures: it initially boosted end-user data rates to 3.6 Mbps, up to a peak theoretical figure of 14.4 Mbps per user, while reducing latency and increasing per-cell data capacity by up to a factor of 5 in dense urban environments.<sup>[5](https://www.3gpp.org/ftp/pcg/pcg_15/docs/pdf/PCG15_22.pdf)</sup>

**HSPA and later releases.** Releases 5 and 7 added MIMO antennas and 16QAM on the uplink and 64QAM on the downlink, and Release 8 continued HSPA evolution with features such as dual cell HSDPA and 64QAM with MIMO.<sup>[15](https://www.3gpp.org/ftp/workshop/2010_04_Rio_LTEseminar/02_Standards%20Roadmap.pdf)</sup><sup> • </sup><sup>[16](https://www.3g4g.co.uk/Lte/LTE_WP_0909_Agilent.pdf)</sup> A 3GPP study item established a framework for evolving the FDD mode of the HSPA WCDMA-based radio access technology beyond Release 7.<sup>[17](https://standards.iteh.ai/catalog/standards/etsi/94831a16-1e07-41ad-b555-da79ed8a35ef/etsi-tr-125-999-v7-1-0-2008-04)</sup>

Compared with its main 3G rival CDMA2000, which was optimized for operators with narrow spectrum and a cdmaOne legacy, UMTS with its wider [W-CDMA](https://www.edgepedia.org/w-cdma) channel delivered higher data rates and a more straightforward evolution path to HSPA and LTE, backed by the large GSM ecosystem.<sup>[18](https://engineeringniche.com/article/comparing-3g-network-standards-cdma2000-vs-umts/)</sup>

## Deployment history

NTT DoCoMo launched the first commercial WCDMA 3G mobile network on 1 October 2001 in Japan under the FOMA brand, after postponing the launch from May 2001.<sup>[3](https://www.umtsworld.com/news/history.htm)</sup><sup> • </sup><sup>[19](https://www.itu.int/itunews/issue/2001/08/licensing3g.html)</sup> In Europe, Manx Telecom launched the first 3G network on the [Isle of Man](https://www.edgepedia.org/isle-of-man) in December 2001, with commercial service available from July 2002, and Telenor opened the first commercial European UMTS network in Norway on 1 December 2001.<sup>[3](https://www.umtsworld.com/news/history.htm)</sup><sup> • </sup><sup>[20](https://www.itu.int/itunews/issue/2003/06/thirdgeneration.html)</sup> Finland was the first country in the world to license 3G, and Sonera met its licensing conditions by having a network available on 1 January 2002, though commercial service was not available until September because of a lack of handsets.<sup>[20](https://www.itu.int/itunews/issue/2003/06/thirdgeneration.html)</sup>

Uptake was slower than initially announced. Handset availability and network interoperability were cited as reasons, and at the end of 2002 the two Japanese W-CDMA operators, NTT DoCoMo and J-Phone, had a combined 153,200 3G subscribers. By contrast, CDMA2000 1X, which could launch in existing licensed frequencies without a new license in all countries except Japan, had reached 30 commercial launches in 17 countries and 32.6 million subscribers by the end of December 2002.<sup>[20](https://www.itu.int/itunews/issue/2003/06/thirdgeneration.html)</sup>

## Licensing

The European Union required member states to make the necessary arrangements for launching UMTS by 1 January 2002, and most Western European countries awarded licenses in 2000, largely through auctions.<sup>[21](https://www.itu.int/ITU-D/ict/statistics/at_glance/UMTS2001.html)</sup> The UK auction, awarded in April 2000, raised £22,477 million (about US$35,411 million) for five licenses, and the German auction raised €50,519 million for six licenses; across the EU and Norway and Switzerland, 67 licenses raised a total of about €105,090 million.<sup>[21](https://www.itu.int/ITU-D/ict/statistics/at_glance/UMTS2001.html)</sup> The EU decision imposed a specific timetable, including a licensing deadline of 1 January 2000 and commercial service introduction by 1 January 2002, which few EU countries met; four years after the licensing process began, penetration of licensed 3G systems was less than 0.4 percent of total worldwide mobile subscribers.<sup>[20](https://www.itu.int/itunews/issue/2003/06/thirdgeneration.html)</sup>

## Shutdown

UMTS networks have been retired as operators migrate to 4G and 5G. Verizon retired its 3G CDMA network on 31 December 2022.<sup>[8](https://www.verizon.com/business/support/services-and-apps/cdma-network-retire/?os=i)</sup> In the United Kingdom, Vodafone, EE, Three, and O2 have all completed their 3G switch-offs, and the operators have committed to switching off 2G by 2033 at the latest.<sup>[7](https://www.ofcom.org.uk/phones-and-broadband/coverage-and-speeds/2g-and-3g-switch-off-our-expectations-of-mobile-providers?language=en)</sup> According to GSMA Intelligence, 131 networks were planned to be shut down by 2030, with 61 scheduled for 2025, as operators address declining traffic on legacy 2G/3G networks and reuse spectrum for newer technologies.<sup>[22](https://www.gsma.com/connectivity-for-good/spectrum/technology-upgrades-and-legacy-network-sunsets-on-the-rise/)</sup>

## References

1. [ITU-T Recommendation Q.1741.7 (11/2011): IMT-2000 references to Release 9 of GSM-evolved UMTS core network](https://www.itu.int/ITU-T/recommendations/rec.aspx?rec=Q.1741.7)
2. [ITU-D Question 18/2: IMT-2000 Terrestrial Radio Standards](https://www.itu.int/dms_pub/itu-d/opb/stg/D-STG-SG02.18-2006-R1-PDF-E.pdf)
3. [The history of UMTS and 3G development, UMTSWorld](https://www.umtsworld.com/news/history.htm)
4. [Performance evaluation of interference and cell loading in UMTS networks, Teletraffic Science and Engineering, Vol. 4, 2001](https://www.sciencedirect.com/science/chapter/bookseries/pii/S1388343701801463)
5. [3GPP PCG White Paper on 3G/UMTS and HSDPA](https://www.3gpp.org/ftp/pcg/pcg_15/docs/pdf/PCG15_22.pdf)
6. [3GPP RP-010672: UMTS1800/1900 Work Task, TR 25.885](https://www.3gpp.org/ftp/tsg_ran/tsg_ran/tsgr_13/docs/PDFs/RP-010672.pdf)
7. [Ofcom: 3G and 2G switch-off](https://www.ofcom.org.uk/phones-and-broadband/coverage-and-speeds/2g-and-3g-switch-off-our-expectations-of-mobile-providers?language=en)
8. [Verizon Business: 3G CDMA Network Retirement](https://www.verizon.com/business/support/services-and-apps/cdma-network-retire/?os=i)
9. [ITU 160th anniversary: 1990s–2020s](https://www.itu.int/160/our-history/1990s-2020s/)
10. [ETSI TS 125 301 V7.2.0: UMTS Radio interface protocol architecture](https://www.etsi.org/deliver/etsi_ts/125300_125399/125301/07.02.00_60/ts_125301v070200p.pdf)
11. [3GPP SP-000209: Technical Specification Group Services and System Aspects](https://www.3gpp.org/ftp/TSG_SA/TSG_SA/TSGS_08/Docs/PDF/SP-000209.pdf)
12. [Modelling of the access part of a multi-service mobile network with service priorities, EURASIP Journal on Wireless Communications and Networking](https://link.springer.com/article/10.1186/s13638-015-0420-4)
13. [Automated Up- and Downlink Capacity Balancing in WCDMA Networks](https://www.researchgate.net/publication/4281668_Automated_Up-_and_Downlink_Capacity_Balancing_in_WCDMA_Networks)
14. [3GPP: Release 1999](https://www.3gpp.org/specifications-technologies/releases/release-1999)
15. [3GPP Technology Standards Roadmap](https://www.3gpp.org/ftp/workshop/2010_04_Rio_LTEseminar/02_Standards%20Roadmap.pdf)
16. [Agilent: 3GPP LTE System Overview white paper](https://www.3g4g.co.uk/Lte/LTE_WP_0909_Agilent.pdf)
17. [ETSI TR 125 999 V7.1.0: UMTS High Speed evolution](https://standards.iteh.ai/catalog/standards/etsi/94831a16-1e07-41ad-b555-da79ed8a35ef/etsi-tr-125-999-v7-1-0-2008-04)
18. [Comparing 3G Network Standards: CDMA2000 vs. UMTS, Engineering Niche](https://engineeringniche.com/article/comparing-3g-network-standards-cdma2000-vs-umts/)
19. [ITU News: Licensing 3G (2001)](https://www.itu.int/itunews/issue/2001/08/licensing3g.html)
20. [ITU News: The evolution to 3G mobile — status report (2003)](https://www.itu.int/itunews/issue/2003/06/thirdgeneration.html)
21. [ITU: Status of IMT-2000 (UMTS) 3G mobile licensing in Western Europe](https://www.itu.int/ITU-D/ict/statistics/at_glance/UMTS2001.html)
22. [GSMA: Technology upgrades and legacy network sunsets on the rise](https://www.gsma.com/connectivity-for-good/spectrum/technology-upgrades-and-legacy-network-sunsets-on-the-rise/)

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*Topic: Encyclopedia › Technology and the built world › Communications and everyday technology › Telephony systems and services › Cellular network generations (3G, 4G, 5G)*

*Initially written Sep 17, 2026 · Reviewed: Sep 30, 2026; Oct 15, 2026 · Edited: Sep 30, 2026; Oct 15, 2026 · Last review: Oct 15, 2026*

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