4G Technology News » UMTS http://www.4gsoft.com All you need to know about 4G Technology, 4G Phones, 4G LTE and 4G WiMax Technology. Wed, 22 Jul 2009 21:07:11 +0000 http://wordpress.org/?v=2.8.2 en hourly 1 UMTS http://www.4gsoft.com/jargon-buster/umts/ http://www.4gsoft.com/jargon-buster/umts/#comments Sun, 07 Jun 2009 22:32:29 +0000 Sky http://www.4gsoft.com/?p=79 Universal Mobile Telecommunications System (UMTS) is one of the third-generation (3G) mobile telecommunications technologies, which is also being developed into a 4G technology. It is specified by 3GPP and is part of the global ITU IMT-2000 standard. The most common form of UMTS uses W-CDMA (IMT Direct Spread) as the underlying air interface but the system also covers TD-CDMA and TD-SCDMA (both IMT CDMA TDD). Being a complete network system, UMTS also covers the radio access network (UMTS Terrestric Radio Access Network; UTRAN), the core network (Mobile Application Part; MAP) as well as authentication of users via USIM cards (Subscriber Identity Module).

Unlike EDGE (IMT Single-Carrier, based on GSM) and CDMA2000 (IMT Multi-Carrier), UMTS requires new cell towers and new frequency allocations. However, it is closely related to GSM/EDGE as it borrows and builds upon concepts from GSM. Further, most UMTS handsets also support GSM, allowing seamless dual-mode operation. Therefore, UMTS is sometimes marketed as 3GSM, emphasizing the close relationship with GSM and differentiating it from competing technologies.

For More Information:  http://en.wikipedia.org/wiki/Umts

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