3G Networks

3G is the third generation of tele standards and technology for mobile networking, superseding 2.5G. It is based on the International Telecommunication Union (ITU) family of standards under the IMT-2000.[1]
3G networks enable network operators to offer users a wider range of more advanced services while achieving greater network capacity through improved spectral efficiency. Services include wide-area wireless voice telephony, video calls, and broadband wireless data, all in a mobile environment. Additional features also include HSPA data transmission capabilities able to deliver speeds up to 14.4 Mbit/s on the downlink and 5.8 Mbit/s on the uplink.
Unlike IEEE 802.11 networks, which are commonly called Wi-Fi or WLAN networks, 3G networks are wide-area cellular telephone networks that evolved to incorporate high-speed Internet access and video telephony. IEEE 802.11 networks are short range, high-bandwidth networks primarily developed for data.
Contents[hide]
1 Implementation and history
1.1 UMTS terminals
1.2 Speed
1.3 Network standardization
1.3.1 IMT-2000 standards and radio interfaces
1.3.2 Advantages of a layered network architecture
1.4 3G evolution (pre-4G)
2 Evolution from 2G to 3G
2.1 From 2G to 2.5G (GPRS)
2.2 From 2.5G to 2.75G
2.3 From 2.75G to 3G
2.4 Migrating from GPRS to UMTS
3 Security
4 Issues
5 See also
6 Further reading
7 References
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