3G
International Mobile Telecommunica
tions-2000 (IMT-2000)', better known as 3G or 3rd Generation, is a family of standards for mobile telecommunications defined by the International Telecommunication Union,[1] which includes GSM EDGE, UMTS, and CDMA2000 as well as DECT and WiMAX. 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 (up to 14.0 Mbit/s on the downlink and 5.8 Mbit/s uplink ).
==Overview==! bandwidth of data ! pre-4G ! width="3%" duplex ! width="3%" channel ! description ! geographical areas - - ! TDMA Single‑Carrier (IMT‑SC) colspan="2" EDGE (UWT-136) EDGE Evolution none rowspan="3" FDD TDMA evolutionary upgrade to GSM/GPRS[nb 1] worldwide, except Japan and South Korea - ! CDMA Multi‑Carrier (IMT‑MC) colspan="2" CDMA2000 EV-DO UMB[nb 2] rowspan="4" CDMA evolutionary upgrade to cdmaOne (IS-95) Americas, Asia, some others - ! CDMA Direct Spread (IMT‑DS) rowspan="3" UMTS[nb 3] W-CDMA[nb 4] rowspan="3" HSPA rowspan="3" LTE rowspan="3" family of revolutionary standards. worldwide - ! rowspan="2" CDMA TDD (IMT‑TC) TD‑CDMA[nb 5] rowspan="4" TDD Europe - TD‑SCDMA[nb 6] China - ! FDMA/TDMA (IMT‑FT) colspan="2" DECT colspan="2" none FDMA/TDMA short-range; standard for cordless phones Europe, USA - ! IP‑OFDMA colspan="2" colspan="2" WiMAX (IEEE 802.16) OFDMA late addition worldwide }
tions-2000 (IMT-2000)', better known as 3G or 3rd Generation, is a family of standards for mobile telecommunications defined by the International Telecommunication Union,[1] which includes GSM EDGE, UMTS, and CDMA2000 as well as DECT and WiMAX. 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 (up to 14.0 Mbit/s on the downlink and 5.8 Mbit/s uplink ).==Overview==! bandwidth of data ! pre-4G ! width="3%" duplex ! width="3%" channel ! description ! geographical areas - - ! TDMA Single‑Carrier (IMT‑SC) colspan="2" EDGE (UWT-136) EDGE Evolution none rowspan="3" FDD TDMA evolutionary upgrade to GSM/GPRS[nb 1] worldwide, except Japan and South Korea - ! CDMA Multi‑Carrier (IMT‑MC) colspan="2" CDMA2000 EV-DO UMB[nb 2] rowspan="4" CDMA evolutionary upgrade to cdmaOne (IS-95) Americas, Asia, some others - ! CDMA Direct Spread (IMT‑DS) rowspan="3" UMTS[nb 3] W-CDMA[nb 4] rowspan="3" HSPA rowspan="3" LTE rowspan="3" family of revolutionary standards. worldwide - ! rowspan="2" CDMA TDD (IMT‑TC) TD‑CDMA[nb 5] rowspan="4" TDD Europe - TD‑SCDMA[nb 6] China - ! FDMA/TDMA (IMT‑FT) colspan="2" DECT colspan="2" none FDMA/TDMA short-range; standard for cordless phones Europe, USA - ! IP‑OFDMA colspan="2" colspan="2" WiMAX (IEEE 802.16) OFDMA late addition worldwide }
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