gsm basics by essar cellphone
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WhatisCommunication?
Theexchangeofinformationis
calledcommunication
(The
Tx
or
Rxofinformation)
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WiredCommunication
WirelessCommunication
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WhatisWiredCommunication?
Communicationwithphysical
connectivit between Transmitter and
Receiver.
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qu pmen so
re
Communication
NormalTelephoneCommunication(PSTN)
TelexCommunication
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WhatiswirelessCommunication?
Communicationwithout
actual
physical
connectivitybetweenTransmitterand
Receiver
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'Communication
Cordlessphones
Pagers
DECTphones
Radio
Television
GSM
CDMA
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Advantageofwireless
Mobility
Availability
Reliability
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sa van ageso
w re ess
communication
PoorvoiceQuality(Attimes)
CommunicationdependsuponSignalQuality
PowerrequireforHandset
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WhatisGSMCommunication?
COMMUNICATIONS iscalledGSM
Communication GSMSpecificationsdesignedbyEuropean
TelecommunicationsStandardsInstitute
Committee
(ETSI
)
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GSM is the international standard in Euro e Australia
and much of Asia and Africa. In covered areas, cellphoneusers can buy one phone that will work
.the specific service providers in these different
countries, GSMusers simply switch subscriber
identification module (SIM) cards. SIM cards are smallremovable disks that slip in and out of GSM cell
.identification numbers you need to access a particularwireless service provider.
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States are not compatible with the
.
States and need to have a cell phone access
' ,
is buy a GSM 900MHz/1800MHz cell phone
.
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GSM uses 13 kbps voice communication. In 20MHz of total spectrum (paired spectrum of
10MHz each way), 400 channels are available. When using nonsectorised cells, at best a reuse
e c ency o . s poss e. s mp es, a ou x0.33 or 135 channels per cell implying a trunking
efficiency of about 0.85.
be approximately 766. For a cell radius of 10 kms, 3kms and 1 km, of the subscriber density served givenb 766/ r2 will be 2.4, 27, and 245 subscribers/s
km, respectively.
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TheGSMnetworkcanbedivided
intofourmainparts
The Mobile Station, which is carried by the subscriber
The Base Station Subsystem, which controls the radio link
The Network and Switching Subsystem, the main part of
which is the Mobile Services Switchin Center and which
performs the switching of calls between the mobile and
other fixed or mobile network users, as well as
management o mo i e services, suc as aut enticationThe Operation and Support Subsystem, which oversees
.
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WIRELESSWIRELESS
Wireless is a term used to describe
electromagnetic waves (rather than
part or all of the communication path.
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SMS (Short Message Service) A service for
sending messages of up to 160 charactersto mobile phones that use Global Systemfor Mobile (GSM) communication.
SMS messages do not require the mobilephone to be active and within range. They
can a so e sent rom a we site.
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adaptationof
the
Short
Message
Service
,
melodies,pictures,sounds,andanimationsto
.
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based wireless communication service that promisesdata rates from 56 up to 114 Kbps and continuous
connection to the Internet for mobile phone and
computer users. As GPRS becomes available, mobileusers o a v r ua pr va e ne wor w e a e o
access the private network continuously rather than
.
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Class2 oneup 812kbps,2down1624kbps(2+1) Class4 oneup8 12kbps,3down24 36kbps
Class6 twoup16 24kbps,threedown 24 36kbps
Class8
one
up
8
12
kbps
,four
down
32
40
kbps
class10 oneup8 12kbps,fourdown32 48kbpsortwoup16 24,
Class12 oneup8 12kbps,fourdown3248kbpsortwoup16 24kbps,threedown24 36kbpsorthreeup24 36kbps,twodown16
24kbps
or
four
up
32
48
kbps
one
down
8
12
kbps
NOTE
UPmeanstransmit
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PACKETSWITCHINGGPRS involves overlaying a packet based air interface on theexisting circuit switched GSM network. This gives the user anoption to use a packetbased data service. To supplement a circuitsw tc e networ arc tecture w t pac et sw tc ng s qu te a
major upgrade.With GPRS, the information is split into separate but related" "receiving end. Packet switching is similar to a jigsaw puzzle theimage that the puzzle represents is divided into pieces at themanufacturin factor and ut into a lastic ba . Durintransportation of the now boxed jigsaw from the factory to the enduser, the pieces get jumbled up. When the recipient empties thebag with all the pieces, they are reassembled to form the original
image. A t e pieces are a re ate an it toget er, ut t e waythey are transported and assembled varies. The Internet itself isanother example of a packet data network, the most famous of
.
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fora
set
of
communication
protocols
to
standardize
thewaythatwirelessdevices,suchascellular
telephonesandradiotransceivers,canbeusedfor
Internet
access,
including
email
and
the
World
Wide
e .
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HSCSDHSCSD
enhancement of data services ("Circuit SwitchedData CSD) of all current GSM networks. It allows
you to access nonvoice services at 3 times faster,
which means subscribers are able to send andrece ve a a rom e r por a e compu ers a a
speed of up to 28.8 kbps; this is currently being
43.2 kbps.
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telecommunications industry specification thatdescribes how mobile hones com uters and
personal digital assistants can easily interconnect
with each other using a shortrange wireless
connection. Bluetooth requires that a transceiver
chip be included in each device.
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electromagnetic radiation spectrum atwavelen ths lon er than those of visible li ht but
shorter than those of radio waves. Infrared is
used in a variety of wireless communications,monitoring, and control applications.
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EDGEEDGE
EDGE or Enhanced Data Rates for Global Evolution
datacom capacity of GPRS
(General Packet RadioService) enhanced GSM networks, enabling GSMoperators to provide highspeed Mobile Internetservices over existing infrastructure. Operators can
individual user data rates by three times, or to servethree times the number of datacom users, or to free
up capacity for stillexpanding voice traffic.
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RAD E N LRAD E N L
What different services will be available on third generationsystems?
Video on demand, high speed multimedia and mobile Internetaccess are just a few of the possibilities for users in the future.3GSM Services will expand the possibilities of information andcommun ca on.
The main benefit is that they will offer highend service
capabilities, which includes substantially enhanced capacity,.include the concurrent usage of multiple services.
3GSM Services will also bridge the gap between the wireless,
operation apparently seamless.
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machine
or
program
to
receive
and
interpret
dictation,ortounderstandandcarryoutspoken
commands.
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This service facilitates high speed of datatransmission and uses the Packet SwitchingTechnology offering air interface transfer rates
at much higher speeds than normal datatrans er epen ing on mo i e terminacapabilities and Carrier interference. GPRS
interface resources.
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G P R SGPRS is a boon to that segment of customers who
would like to transmit data intermittently which
offers them at the most economical prices as
compared to the conventional mode of Data transfer
.
experience data transfer speeds up to 43 Kbps, which
can now surf Internet, view their Companys Intranet
databases, Mails using their Handsets. Because of its
characteristics, GPRS has found itself a place in theforay of building of tremendous Value Added
erv ces, w c w e p rea ze e reams o a a
hungry users
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BENEFITS OF GPRS
High Speed Data Access: As the name
,
longer is the Data transfer restricted to the. . ,
upto 43 Kbps can be experienced by a user
.
However, these speeds can be increased
.
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BENEFITS OF GPRS
Always ON: With GPRS, users now no
longer be worried of connecting and
disconnecting with the prevailing mindsetof coughing up huge amounts for airtime,
which was so till date. Once logged, the
user needs to only worry about the data,which is transferred, thereby making GPRS
a viable bearer for cost effective data
communication.
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ng e e wor or o ce a a:
uses e same ne wor , w c was
supporting for Voice. This benefit is
rans erre o e user w en e s rece v ng
or making any voice calls. This is basically
poss e ue o e ec no ogy e nGPRS.
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MMS
pictures,pictures, texttext andand voicevoice atat oneone gogothroughthrough MMSMMS HandsetHandset..
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