sachit said:These standards are part of 3GPP Evolution.
They evolved as below.
GSM-->GPRS-->EDGE-->WCDM(UMTS)-->HSDPA.
GSM did not support packet data.
GPRS supported packet data at 171.2 kbps theoretically with new network elements in Core network (SGSN and GGSN).
EDGE uses same network elements as GPRS but with new Modulations (8PSK) instead of GMSK in GSM/GPRS. EDGE supported 384 kbps theoretically.
WCDMA(UMTS) is a 3G evolution for GSM family. it supports 2Mbps on forward link. WCDMA uses different radio access network (node B and RNC) rather than BTS and BSC in GSM/GPRS/EDGE networks.
HSDPA is nothing but the improved downlink packet data transfer on UMTS networks. IT supports upto 14.4. Mbps theoretically.
*Note:- GPRS,EDGE and HSDPA are DATA networks only i.e. they do not support circuit switched voice. GSM supports circuit switched voice and circuit switched data both. UMTS supports circuit switched voice and packet data.
regards
555lin said:And what is CDMA EV-DO?
linithos said:hello, I'm newbie on this kind of subjects.
I recently bought a nokia 5800XP, it's an Asian version and it works with WCDMA network for 3G. I live in Colombia and the network is HSDPA, so I can't connect to 3G network, I only can use the GPRS.
There is a way to change my cellphone with HSDPA network?
Thanks in advance and excuse my English
Lina
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