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Universal Mobile Telecommunications System

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Universal Mobile Telecommunications System

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Also known as UMTS

thumb|3G sign shown in notification bar on an Android powered smartphone

~51 min read

Encyclopedic overview

45 sections
Contents
  • Features
  • Air interfaces
  • W-CDMA (UTRA-FDD)
  • Development
  • Rationale for W-CDMA
  • Deployment
  • UTRA-TDD
  • TD-CDMA (UTRA-TDD 3.84 Mcps High Chip Rate (HCR))
  • TD-SCDMA (UTRA-TDD 1.28 Mcps Low Chip Rate (LCR))
  • Objectives
  • Technical highlights
  • History
  • Frequency bands & Deployments
  • Unlicensed UMTS-TDD
  • Comparison with UMTS-FDD
  • Deployment
  • Competing standards
  • Radio access network
  • Core network
  • Frequency bands and channel bandwidths
  • UARFCN
  • Spectrum allocation
  • Interoperability and global roaming
  • Handsets and modems
  • Other competing standards
  • Migrating from GSM/GPRS to UMTS
  • Problems and issues
  • Security issues
  • Releases
  • Release '99
  • Release 4
  • Release 5
  • Release 6
  • Release 7
  • Release 8
  • Release 9
  • See also
  • Other, non-UMTS, 3G and [[4G]] standards
  • Other information
  • Notes
  • References
  • Citations
  • Bibliography
  • Documentation
  • External links

thumb|3G sign shown in notification bar on an Android powered smartphone

The Universal Mobile Telecommunications System (UMTS) is a 3G mobile cellular system for networks based on the GSM standard. UMTS uses wideband code-division multiple access (W-CDMA) radio access technology to offer greater spectral efficiency and bandwidth to mobile network operators compared to previous 2G systems like GPRS and CSD. The original version of UMTS provides a peak theoretical data rate of 384 kbit/s.

Excerpted from Wikipedia’s “Universal Mobile Telecommunications System” article, available under the CC BY-SA 4.0 licence.

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