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MOBILE
COMMUNICATION
SYSTEMS
>An electronic telecom device>Often referred to as a cellphone.>Mobile phones connect to wireless communication network through radio wave or satellite transmissions>Most mobile phones provide voice communications,Short Message Service
(SMS), Multimedia Message Service (MMS) and also provide Internet services such
as Web browsing and e-mail.
What is a MOBILE
From WARS…..
….To introductionof radio telephone
system inCARS
photography & texting
From
...To social Networkingthrough mobile Internet
MOBILE COMMUNICATION
SYSTEMS&
WIRELESSNETWORKS
ARESETTING THE FUTURE
SCOPE OF WIRELESS SYSTEMS
10/10/2011
In the past 3 decades,the world has seen significant changes in the telecom indusrty
There has been rapid growth in wireless communication and large expansion in mobile systems
Currently,wireless data represents 15%-20% of all air time
More than 10 billion people use wireless e-mail & INTERNET related wireless services
Wireless $ystemsconsist of ~
WWAN>Wireless Wide Area NetworkWLAN>Wireless Local Area NetworkWPAN>Wireless Personal Area Network
BLUETOOTH Ultra WideBand{ UWB }
Sensor Networks Zigbee
WPANShort Range & Low Power
Home RF
IEEE802a,b,g
WLANMedium Range & Medium Power
WWANLong Range & High Power
2G GSM
PDC
GPRS PHS
3G
the “Generation”’s
of cellular $ystem
1G •CELLULAR NETWORKS
2G •DIGITAL NETWORKS
3G •HIGH SPEED IP DATA NETWORKS AND MOBILE BROADBAND
4G •ALL IP NETWORKS
1G = Cellular Networks
>The 1st commercially available cellular network using 1G was introduced by NTT {Nippon Telegraph & Telephone} in 1979 in Japan>1G networks used analog signals,as opposed to digital signals used by the future succesive generations.
1G = Cellular Networks
>In 1G,voice communications were simply modulated to a higher frequency,about 150 MHz and more>At this time,the TDMA{Time Division Multiple Access} technology was used
Martin is credited with developing the 1st 1G cell phone approved for commercial use
2G = Digital Networks>2G was commercially launched by Radiolinja in 1991 in Finland
>2G mobile systems emerged primarily using the GSM{Global System for Mobile communication} standard
>2G allowed for enhanced data services & also introduced SMS{Short Message Service}
2G = Digital Networks>In 2G,voice communications were digitallly encrypted,allowing greater privacy,efficient data transfer & less expensive equipment
>Two revisions to 2G are reffered as 2.5G & 2.75G
2.5G >The combined introduction of GPRS {General Packet Radio Service} & the usage of CDMAone {Code Division Multiple Access} networks were collec- -tively known as 2.5G
>Services like WAP{Wireless Application Protocol} & MMS were introduced,along with InterNet services
2.75G >2.75G was the name given to the evolution of Enhanced GPRS{EGPRS}
>2G is the most widely used generation of mobile communication networks
3G = High $peed IP data & Mobile Broadand>3G was introduced by NTT DoCoMo in Japan in 2001
>3G used completely different radio frequencies from 2G.Thus,it required different equipment to achieve the new high data transfer rates
3G = High $peed IP data & Mobile Broadand>Also,the enormous costs of additional spectrum licensing fees delayed introduction of 3G in many countries
>The main difference between 2G & 3G technologies is the use of packet switching rather than circuit switching for data transmission
3G = High $peed IP data & Mobile Broadand>3G transfer rates are 384 kbps to 2Mbps allowing previously unavailable services like video calss,video conferencing, online conference call,mobile TV,online gaming etc….
>Along with these services,3G provides greater security & privacy
3G = High $peed IP data & Mobile Broadand>As with 2G,minor evolution of the standards resulted in 3.5G and 3.75G
>These standards allowed for higher data
transfer rates exceeding 2Mbps,reaching reaching about 14Mbps
4G = All IP Network>The next generation,4G mobile phones are all set to provide data transfer rates of 100Mbps to 1Gbps.Such speeds are not even present in wired networks commercially
>The 1st two commercially available technologies billed as 4G are the WiMAX standard & the LTE standard
4G = All IP Network>One of the main ways in which 4G differs from 3G is its elimination of circuit switch- -ing,instead employing all IP networks {Internet Protocol}>Thus,4G ushered in a treatment of voice calls just like any other type of streaming audio media,utilising packet switching over InterNet,LAN or WAN networks via VoIP{Voice over InterNet Protocol}-which delivers voice communi-
4G = All IP Network -cations & multimedia sessions over IP-networks,such as th InterNet
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