It is one of the International Digital Radio Standard
It was initially developed by CEPT and later standardised by ETSI
CEPT stands for Conference of European Post and Telecommuncations
ETSI stands for European Telecom Standards Institute
CEPT put the name Groupe Speciale Mobile
Under ETSI,GSM stands for Global System for Mobile Communications
It operates in 900MHz and 1800 MHz (In USA 850MHz and 1900MHz)
The following are the components in a GSM System:
Mobile Station (MS)
Mobile Equipment (ME)
Subscriber Identity Module (SIM)
Base Station Subsystem (BSS)
Base Transceiver Station (BTS)
Base Station Controller (BSC)
Network Switching Subsystem(NSS)
Mobile Switching Center (MSC)
Home Location Register (HLR)
Visitor Location Register (VLR)
Authentication Center (AUC)
Equipment Identity Register (EIR)
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It is a 2G Mobile Technology
What is the meaning of 1G,2G,3G?
iG uses Analog transmission. eg. AMPS
2G and above are using Digital transmission.
Depending upon the data speeds, the generation varies
List of GSM related technolgies (approx values)
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| GSM | 2G | data speed 9.6kbps |
| GPRS | 2.5G | data speed 150 kbps (practically 56 kbps) |
| EDGE | 2.5G | data speed 384 kbps(but 100kbps uplink)
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| UMTS/WCDMA | 3G | data speed 384 kbps bothways |
| UMTSLTE | 4G | data speed 100mbps (50mbps uplink) |
List of CDMA related technolgies
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| CDMA | 2G | data speed 9.6kbps |
| CDMA2001x-RTT | 2.5G | data speed Upto 144kbps |
| CDMA20001x-EVDO | 3G | data speed 2400 kbps(but 155kbps uplink)
|
| CDMA20001xRev.B | 4G | data speed 73mbps/27mbps |
| UMB | 4G | data speed 129mbps/75.6mbps |
Frequency details
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Carrier Separation : 200 Khz
No. of RF carriers : 124
Access Method : TDMA/FDMA
Modulation Method : GMSK
Modulation data rate : 270.833 Kbps
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Equipments involved in an outgoing call
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MS sends dialled digits to BSS
BSS sends dialled digits to MSC
MSC checks with VLR whether this MS is allowed for this service.
If yes ,MSC asks BSS to allocate resources for the call.
If the calling party belongs to some other network, then
MSC routes the call to GMSC.
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How Incoming call takes place
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HLR contacted
Get MSRN from VLR
Get status of MS
Paging of MS
MS Answers
Security Checkings
Connections Setup
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3G phones can used for lot of applications like video,video-conferencing,
games,Internet,email,pornography,etc,etc.3G stands for Games,Gambling,Girls(lol!)
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