Friday, April 22, 2011

3G Universal Mobile Telecommunications System (UMTS)

3G Third generation network - UMTS
Mobile communication of third generation 3G - standard UMTS

The third generation of mobile communications 3G started in 2002, 12 years after the beginning of its development. 3G Includes 3 standards - UMTS, WCDMA and CDMA2000. 3G provides speeds of 384 kbit / s to 2.4 Mbit / s. New services are video call, radio and TV reception and more. 3G launched first in Japan and to date 98 percent of consumers in the country are using it. Recent technical advances have led to the creation of a 3.5G standard, named HSDPA (High Speed Downlink Packet Access), enabling speeds of 3 Mbit / s to 14 Mbit / s.

Universal Mobile Telecommunications System (UMTS) is a third generation (3G) mobile telecommunication technology, which also developed in fourth generation 4G technology. Currently, the most common form of UMTS uses W-CDMA air interface as the default. UMTS and it consumed W-CDMA standardized by 3GPP and the European response to ITU IMT-2000 requirements for cellular radio 3G.

UMTS is able to maintain high speed data and out loud. The system supports multiple modes, including switching channels, packet switching and virtual channels. UMTS supports data transmission through both IP protocol, and through other protocols, enabling speeds up to 2 Mbps for stationary mobile terminals. The speed of pedestrians in work will fall to around 384 kbps, and for moving vehicles - to around 144 kbps.

UMTS Radio Interface

UE - UTRAN - CN

The architecture of a UMTS network is made up of three interrelated components: Core Network (CN), UMTS Terrestrial Radio Access Network (UTRAN) and User Equipment (UE). UTRAN provides two methods for Radio Access W-CDMA - FDD and TD - CDMA - TDD.

In W-CDMA BSs have directed antennas and a BS serves several cells. In W-CDMA subscribers can havŠµ a link to two BSs.




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