mobile communication…understand the standards..

Mobile communication standards

GSM / UMTS (3GPP) Family

GSM (2G)

GPRS
EDGE (EGPRS)

EDGE Evolution

CSD

HSCSD

UMTS (3G)

HSPA

HSDPA
HSUPA
HSPA+

UMTS-TDD

TD-CDMA
TD-SCDMA

FOMA

UMTS Rev. 8 (Pre-4G)

LTE
HSOPA (Super 3G)

CDMA (3GPP2) Family

cdmaOne (2G)

CDMA2000 (3G)

EV-DO

UMB (Pre-4G)

AMPS Family

AMPS (1G)

TACS / ETACS

D-AMPS (2G)

Other Technologies

Pre Cellular

PTT
MTS
IMTS
AMTS
OLT
MTD
Autotel / PALM
ARP

1G

NMT
Hicap
CDPD
Mobitex
DataTAC

2G

iDEN
PDC
CSD
PHS
WiDEN

Pre-4G

iBurst
HIPERMAN
WiMAX
WiBro
GAN (UMA)

Channel Access Methods

FDMA

OFDMA

TDMA
SSMA

CDMA

Frequency bands

Cellular

GSM
UMTS
PCS

SMR

GSM…we all use it 24×7..

Global System for Mobile communications (GSM: originally from Groupe Spécial Mobile) is the most popular standard for mobile phones in the world.

Its ubiquity makes international roaming very common between mobile phone operators, enabling subscribers to use their phones in many parts of the world.
GSM differs from its predecessors in that both signalling and speech channels [...]