3G wireless telecommunication

International Mobile Telecommunications 2000 (IMT-2000), better known as 3G or 3rd Generation, is a family of standards for mobile telecommunications fulfilling specifications by the International Telecommunication Union, which includes UMTS, and CDMA2000 as well as the non-mobile wireless standards DECT and WiMAX. While the GSM EDGE standard also fulfils the IMT-2000 specification, EDGE phones are typically not branded 3G. Services include wide-area wireless voice telephone, video calls, and wireless data, all in a mobile environment. Compared to 2G and 2.5G services, 3G allows simultaneous use of speech and data services and higher data rates. Today's 3G systems can in practice offer up to 14.0 Mbit/s on the downlink and 5.8 Mbit/s on the uplink.

Overview

There are evolutionary standards that are backwards-compatible extensions to pre-existing 2G networks as well as revolutionary standards that require all-new networks and frequency allocations. The later group is the UMTS family, which consists of standards developed for IMT-2000, as well as the independently developed standards DECT and WiMAX, which were included because they fit the IMT-2000 definition.

1. Can also be used as an upgrade to PDC or D-AMPS.
2. Development halted in favour of LTE.
3. Also known as FOMA, UMTS is the common name for a standard that encompasses multiple air interfaces.
4. Also known as UTRA-FDD; W-CDMA is sometimes used as a synonym for UMTS, ignoring the other air interface options.
5. Also known as UTRA-TDD 3.84 Mcps high chip rate (HCR)
6. Also known as UTRA-TDD 1.28 Mcps low chip rate (LCR)

While EDGE fulfills the 3G specifications, most GSM/UMTS phones report EDGE (“2.75G”) and UMTS (“3G”) network availability as separate functionality.

Applications

The bandwidth and location information available to 3G devices gives rise to applications not previously available to mobile phone users. Some of the applications are:

• Mobile TV – a provider redirects a TV channel directly to the subscriber's phone where it can be watched.
• Video on demand – a provider sends a movie to the subscriber's phone.
• Video conferencing – subscribers can see as well as talk to each other.
• Tele-medicine – a medical provider monitors or provides advice to the potentially isolated subscriber.
• Location-based services – a provider sends localized weather or traffic conditions to the phone, or the phone allows the subscriber to find nearby businesses or friends.
  
  
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