BTS, :
- BTS.
- .
- , , , , .
- ( ) - .
- MS ().
:
- .
- (, ).
- BTS.
- MS BTS , .
BTS, , .. " " , (, ). , , - "" .
, .
, .
, BTS, .
, :
- - 100,0 - , , , .
- - 50,0 300,0 - .
- - 1,0 20,0 - .
- - 20,0 - .
(). , .
: -, , , . , , , .
, "" .
GSM.
. GSM 900,0, 1800,0, 1900,0.
, GSM900, GSM1800, : ( MS BTS - ) ( BTS MS - ).
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( TDMA - ).
MS BTS (), - . 200,0.
GSM 900 124 , GSM1800 - 374 . GSM TDMA. TDMA , .. .
8 .
CSD - Circuit Switched Data - . :
- CSD .
- - 9,6/.
- CSD GSM.
- CSD- .
- SD- .
WAP - Wireless Application Protocol -
WAP - () , : , .
WAP - Wireless Application Protocol - , . WAP , Web- ( HTTP TCP/IP).
WAP MS, :
- MS;
- , ;
- ;
- ;
- .
WAP , .
, HTML - Hyper Text Markup Language - - , - tag - , .
( Web- - ) .
, (Internet Explorer, .) .
GSM , . WAP- . "" MS Web- . " " - WML. WAP- . WML . WAP, WAP-, WAP-. WAP- . WAP-, ().
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: 1.0, 1.1, 1.2 2.0. 1.0. , WAP 1.2 2.0 MS. WAP , .
GPRS - General Packet Radio Service -
, GPRS - General Packet Radio Service - .
. , , , " ". BTS MS .
, , .
.
, , .
.
, "" ( ) , GPRS .
, ( ) , ().
.
GPRS (Coding Schemes - CS - ): CS1, CS2, CS3, CS4. -CS1.
GPRS MS 1 8 .
:
- CS1
GSM 900 - 9,6/ - (-), 8 - - 72,4/;
- CS2 - : 13,4/ 107,2/;
- CS3 - : 15,6/ 124,8/;
- CS4 - : 21,4/ 171,2/;
, .. . GPRS- 171,2 (821,4)/ - CS4.
MMS
MMS - Multimedia Message Service - - . , , , .
S SMS - Short Messaging Service - , SMS .
, , GIF JPEG, MPEG4, MP3 MIDI.
, . , . , , . , , WAP-.
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MMS- , . .
MMS , MS, MMSC - Multimedia Messaging Service Center - - - (, . .). , ,
PDA - Personal Digital Assistant - ( ).
GSM
W-CDMA. CSD, GPRS HSCSD (. ) 2G, , GPRS, UMTS 3G.
MMS - MMSC - Multimedia Messaging Service Center - -, , , MMSC , , .
, , MMS-. MMS, SMS- , MMS-. -, , . ,
WAP-, MMS-, . MMS , . , , . MMS- WAP-.
, MMS. , SMS-, , , . , "" .
.
MMS GPRS. .
.
.
.
.
EDGE - Enhanced Data rates for Global Evolution -
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EDGE - Enhanced Data rates for Global Evolution - .
EDGE - ETSI 1997 GSM. (ETSI) , EDGE UWC-136 - 3G IS-136 (D-AMPS).
, EDGE GSM, TDMA (IS-136) .
EDGE - : (2G) (3G) . GSM, GPRS.
(phase I) EDGE ( 1999 .) GPRS, 384,0/. - 2,048/, -: IMT-2000 3G, EDGE, (On-line), (, , ).
EDGE :
- (EGPRS, Enhanced GPRS); - (ECSD, Enhanced Circuit Switched Data). 384,0/ - , 3G.
EDGE GSM, , , .