iit is the worlds’ 7 th largest telecommunication company llargest public sector units in India iit provides telecom services with ICT application in rural and urban areas ooffers wide ranging and most transparent tariff schemes llends a helping hand to the government for e–governance projects

CCell phones: million (April 2008) LLand Lines: million (March 2008) YYearly Cell phone Addition: 83 million (2007) BBroadband connection: 3.47 million (Feb 2008)

 R Reliance was the first to introduce cellular system in the year 2000  T Till date estimated users has raised to million  G GSM operates in the range of 900 MHz  P Provides , pictures, games, music, internet security including text messaging  I Includes national and international roaming

 has been a dominant technology for both voice and data communication  there is a communication path between two stations  circuit switching is applied in telephone networks  an end to end signal is established and data is transmitted through full duplex connection

 during heavy traffic, calls are not blocked  h has greater efficiency in comparison to circuit switching  t to stations of different data rate can exchange packets  i it can carry out data rate conversion

BTS in mobile communication  can connect to the public switched network on the internet  open BTS relies on licensed bandwidth  world’ first large scale community LAN network was built ten years ago at burning centre Components of BTS  network and switching subsystem  base station subsystem  operations support subsystem General architecture  Trans-receiver  Power amplifier  Combiner  Duplexer  Antenna  alarm extension system and control function

IISI54 standard specifies traffic on digital voice channels iinitial implementation triples the calling capacity of AMPS systems ccapacity improvements of 6 to 15 times that of AMPS are possible mmany blocks of spectrum in 800 MHz and 1900 MHz are used aall transmissions are digital

iis a digital air interface, claiming 8 to 15 times the capacity of analog  e employs a commercial adaptation of military, spread spectrum and single side band technology  e every CDMA cell site can use the same 1.25 MHz band  h has soft capacity limit

First Generation technology EVOLUTION  w was launched in Japan by NTT in 1979  i it covered the areas of Tokyo over 20 million with 23 base stations TECHNOLOGY  b based on analog signaling and circuit switched technology uuses multiple cell sites APPLICATION  d designed for voice and not for data ddesigned for transferring call from one site to another

EVOLUTION  first implemented on 1991  operating in about 140 countries  estimated about 248 million users TECHNOLOGY  based on low band digital data signaling  it is a combination of FDMA and TDMA  uses a 25 MHz frequency spectrum in the 900 MHz band APPLICATION  were digitally encrypted and provides high speed  introduction of data services such as and SMS

EVOLUTION t is available to at least one provider in several parts of USA from 2009 TECHNOLOGY  uses OFDM AND OFDMA TECHNOLOGIES  bandwidth flexibility between 5 to 20 MHz  LTE and Wi-Max also comes under the brand of 4G technology APPLICATIONS  it may allow roaming with wireless local loop t may interact with digital video broad casting systems

EVOLUTION  yet to come TECHNOLOGY  will use the router and switch technology ill provide with 25 Mbps connectivity speed ill provide bi-directional large bandwidth shaping APPLICATION  offers high resolution for cell phone users  traffic statistics makes it more accurate  also supports virtual private network

 i it can travel as packets over any equipment that supports packet based communication  it is the current standard for data networks t allows slow transition from direct, connection based communication to VoIP communication  central office of VoIP will connect to an IPV6 internet backbone, which will then connect to the destination office

 it includes location registration, paging and handover t should be able to access services at any location  global roaming should be provided with the help of WLANs’  need not do location registration every time  can instead do concatenated location registration