2,5G, 3G, 4G

充...1
1. 2.5G..2
1.1WiDEN.3
1.2GPRS....4
1.2.1 GPRS..5
1.2.2GPRS 򅅅...7
1.2.3 GPRS.8
1.2.4 GPRS...8
2. 3G...9
3. 3.5G..13
3.1 HSDPA.14
4. 4G.15
4.1 4G..17
4.2WiMax..18
充.........20
.21
充...1
1. 2.5G..2
1.1WiDEN.3
1.2GPRS....4
1.2.1 GPRS..5
1.2.2GPRS 򅅅...7
1.2.3 GPRS.8
1.2.4 GPRS...8
2. 3G...9
3. 3.5G..13
3.1 HSDPA.14
4. 4G.15
4.1 4G..17
4.2WiMax..18
充.........20
.21

, , , , , . . , GSM ( Global System for Mobile telecommunications). 9,6 /, .

GSM GPRS (General Packet Radio Service), 2.5G . , (2G) (3G) . , GSM, ( ) .

: 21

- 2009