Standarty mobilnoi telefonii: 3G, UMTS, 3GPP Long Term Evolution, System Architecture Evolution, HSDPA, DECT, IMS, 4G, EV-DO (Russian Edition)

Istochnik: Wikipedia. Stranitsy: 25. Glavy: 3G, UMTS, 3GPP Long Term Evolution, System Architecture Evolution, HSDPA, DECT, IMS, 4G, EV-DO, Nordic Mobile Telephone, D-AMPS, Circuit Switched Data, 5G, TACS, HSUPA, PDC, IS-136, TDMA, MS-300, FOMA, FDMA, HSCSD, 3.5G, TD-SCDMA, 3,75G. Vyderzhka: 3G (ot angl. - tretʹe pokolenie), tekhnologii mobilʹnoĭ svyazi 3 pokoleniya - nabor uslug, kotoryĭ obʺedinyaet kak vysokoskorostnoĭ mobilʹnyĭ dostup s uslugami seti Internet, tak i tekhnologiyu radiosvyazi, kotoraya sozdaët kanal peredachi dannykh. V nastoyashchyee vremya iz-za massovykh reklamnykh aktsiĭ pod etim terminom chashche vsego podrazumevaet·sya tekhnologiya UMTS. Mobilʹnaya svyazʹ tretʹego pokoleniya stroit·sya na osnove paketnoĭ peredachi dannykh. Seti tretʹego pokoleniya 3G rabotayut na chastotakh detsimetrovogo diapazona, kak pravilo v diapazone okolo 2 GGts, peredavaya dannye so skorostʹyu do 3,6 Mbit/s. Oni pozvolyayut organizovyvatʹ vidyeotelefonnuyu svyazʹ, smotretʹ na mobilʹnom telefone filʹmy i teleprogrammy i t. d. 3G vklyuchaet v sebya 5 standartov semyeĭstva IMT-2000 (UMTS/WCDMA, CDMA2000/IMT-MC, TD-CDMA/TD-SCDMA (sobstvennyĭ standart Kitaya), DECT i UWC-136). Naibolʹshyee rasprostranenie v mire poluchili dva standarta: UMTS (ili W-CDMA) i CDMA2000 (IMT-MC), v osnove kotorykh lezhit odna i ta zhe tekhnologiya - CDMA (Code Division Multiple Access - mnozhestvennyĭ dostup s kodovym razdeleniem kanalov). Takzhe vozmozhno ispolʹzovanie standarta CDMA450. Tekhnologiya CDMA2000 obespechivaet evolyutsionnyĭ perekhod ot uzkopolosnykh sistem s kodovym razdeleniem kanalov IS-95 (amerikanskiĭ standart tsifrovoĭ sotovoĭ svyazi vtorogo pokoleniya) k sistemam CDMA «tretʹego pokoleniya» i poluchila naibolʹshyee rasprostranenie na severoamerikanskom kontinente, a takzhe v stranakh Aziat·sko-Tikhookyeanskogo regiona. Tekhnologiya UMTS (Universal Mobile Telecommunications System - universalʹnaya sistema mobilʹnoĭ elektrosvyazi) razrabotana dlya modernizat...