3g cellular telephony

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3g cellular telephony

  1. 1. SEMINAR ON 3G CELLULAR TELEPHONYPresented by—Mayank Tiwari Satish Chandra Rabha Ranjan PhukanB.Tech 6th Sem B.Tech 6th Sem B.Tech 6th SemRoll No-15 Roll No-04 Roll No-02 DEPARTMENT OF INFORMATION TECHNOLOGY, ASSAM UNIVERSITY SILCHAR 1
  2. 2. Contents Introduction to cellular telephony. Introduction to 3G technology. History of 3G cellular telephony. Evolution of 3G telephony. Technologies. Applications. Advantages. Problems with 3G. Next to 3G. Present and future perspective. Summary. 2
  3. 3. Introduction Cellular telephony derives its name from the partition of a geographic area into small cells. Each cell is covered by A local radio transmitter and A receiver. 3
  4. 4. Cellular Network Structure MSC is the component of a GSM system that carries out call switching and mobility management functions for mobile phones roaming on the network of base stations. It is owned and deployed by mobile phone operators and allows mobile devices to communicate with each other and telephones in the wider Public Switched Telephone Network or (PSTN). 4
  5. 5. Structure of Cellular Network MSC-Mobile Switching Center. Public (Wired) Telephone Network MSC MSC 5
  6. 6. Cellular Telephony- Cellular telephony encompasses the use of cellular phones to place voice calls, exchange short messages, transmit data, browse the web, and issue multimedia calls. 6
  7. 7. Difference with LandlineTelephony Mobile subscriber can talk while on move without any disruption. The nearest base station will provide the service to him. Handoff may take place between base stations. 7
  8. 8. Introduction to 3GTechnology International Mobile Telecommunications-2000 (IMT- 2000), better known as 3G or 3rd Generation, is a family of standards for mobile telecommunications fulfilling specifications by the International Telecommunication. Services include wide-area wireless voice telephone, video calls, and wireless data, all in a mobile environment. 8
  9. 9. Introduction to 3G Technology 3G allows simultaneous use of speech and data services and higher data rates (at least 200 kbit/s peak bit rate to fulfill to IMT-2000 specification). Todays 3G systems can offer practice of up to 14.0 Mbit/s on the downlink and 5.8 Mbit/s on the uplink. 9
  10. 10. History of 3G CellularTelephony First pre-commercial 3G network was launched by NTT DoCoMo in Japan in May 2001 on a pre-release of W- CDMA technology. First commercial launch of 3G was also by NTT DoCoMo in Japan on 1 October 2001. First commercial United States 3G network was by Monet Mobile Networks, on CDMA2000 1x EV-DO technology. 10
  11. 11. History of 3G CellularTelephony In December 2007, 190 3G networks were operating in 40 countries. In 2008, India launched 3G service. It was launched by Mahanagar Telephone Nigam Limited (MTNL)in Delhi and Mumbai. BSNL is providing 3G license and has been operating its services in 380 cities by the end of March 2010. 11
  12. 12. Evolution of 3G Cellular Telephony- 12
  13. 13. 1G cellular systems First commercial cellular network was Nordic Mobile Telephone(NMT) network(1981). Advanced Mobile Phone Service(AMPS) developed in United States(1983). These were analog cellular systems. It is referred to as first generation or 1G. 13
  14. 14. 2G Cellular Systems• Digital systems were invented due to Increase in cellular subscribers. Increase in the need for increased network capacity.• The European initiated Global System for mobile communication (GSM).• United States initiated Code Division Multiple Access.(CDMA).• These digital systems form the second generation cellular system or 2G. 14
  15. 15. 2.5 G cellular Systems 2G has the following disadvantages: Single voice channel. Only one wireless bearer slot of a GSM carrier band is allocated. Transfer rate is limited to 9.6 kbps. Subscriber is charged for voice calls on a connection-time basis. An improvement was made by using multiple bearer slots for the same call. 15
  16. 16. 2.5 G cellular Systems For better data services, General packet Radio Service(GPRS) was developed. It can inter-work with external packet data networks such as Internet. Faster data transfer rate near about 115 kbps was achieved. It forms the 2.5G cellular systems. 16
  17. 17. 3G Cellular Systems Evolution towards third generation was driven by the need of: Higher capacity. Faster data rates. Better quality of service. Also it was required to resolve many incompatibilities, such as  Mobile roaming between different systems. These problems were also resolved by 3G. 17
  18. 18. Evolution of Mobile CommunicationsEvolution of MobileCommunications1G(Analog) 2G(Digital) 3G(Wideband) GSM AMPS 900/1800/1900 CDMA IS-95 TACS IMT-2000 TDMA IS-136 NMT PDC 18
  19. 19. Technologies 3G Technologies: WCDMA or UMTS-FDD (Universal Mobile Telecommunications System - Frequency Division Duplex)---Direct Spread CDMA2000 - 1x-EvDO/EvDV---Multi carrier UMTS – TDD (Time Division Duplex) or TD-SCDMA (Time Division - Synchronous Code Division Multiple Access) ---Time Code 19
  20. 20. UMTS-FDD / WCDMA Wideband Direct Sequence Code Division Multiple Access. Does not assign a specific frequency to each user. Instead every channel uses the full available spectrum. Individual conversations are encoded with a pseudo-random digital sequence. 20
  21. 21. CDMA2000 CDMA2000 1x system offers higher bit rates compared to CDMAOne (approximately 144 kbps). CDMA20001x-EvDO (evolution data optimized) allocates separate 1.25 MHz wireless carrier for data. CDMA20001x-EvDV(evolution data and voice) recombines data and voice into single wireless carrier, for real time data exchange. 21
  22. 22. UMTS – TDD Universal Mobile Telecommunications System(UMTS) - time-division duplexing(TDD). It is a 3GPP standardized version of UMTS networks. 22
  23. 23. TD-SCDMA Time Division Synchronous Code Division Multiple Access. Time division duplex (TDD) Good match for asymmetrical traffic. Single spectral band (1.6 MHz) possible Costs relatively low Handset smaller and may cost less Power consumption lower TDD has the highest spectrum efficiency Power amplifiers must be very linear Relatively hard to meet specifications. 23
  24. 24. 3G Capabilities Voice quality comparable to the public switched telephone network. 144 Kbps- user in high-speed motor vehicles. 384 Kbps- moving slowly over small areas. Up to 2 Mbps- fixed applications like office use Symmetrical/asymmetrical data transmission rates. Support for both packet switched and circuit switched data services like Internet Protocol (IP) traffic and real time video. 24
  25. 25. Applications Mobile TV – a provider redirects a TV channel directly to the subscribers phone where it can be watched. Video on demand – a provider sends a movie to the subscribers phone. Video conferencing – subscribers can see as well as talk to each other. 25
  26. 26. Applications Tele-medicine – a medical provider monitors or provides advice to the potentially isolated subscriber. Location-based services – a provider sends localized weather or traffic conditions to the phone, or the phone allows the subscriber to find nearby businesses or friends. 26
  27. 27. Advantages It provides faster connectivity, faster internet access, and  music entertainment with improved quality. 3G Mobile phone can be used as a modem for computer and can mail the important documents. 27
  28. 28. Advantages Improved digital voice communications. Larger Bandwidth – Higher Data rate Greater subscriber capacity. Fast packet-based data services like e- mail, short message service (SMS), and Internet access at broadband speeds. 28
  29. 29. Advantages Mostcarriers also expect consumers to want : location services interactive gaming streaming video home monitoring and control 29
  30. 30. Problems with 3G No killer application for wireless data as yet. Vendor-driven. The original goal of 3G is to provide a worldwide standard, but along the way, money got the better of common sense. Basex released a report saying companies need to prepare their plan for the 3G wireless world as soon as they can. The report believes there are many problems facing mobile telecom industry on 3G standard, how to adopt it. 30
  31. 31. 3G Vision Universal global roaming Multimedia (voice, data & video) Increased data rates 384 kbps while moving 2 Mbps when stationary at specific locations Increased capacity (more spectrally efficient) 31
  32. 32. What next after 3G?• The future path has fractured 3G & 3G & 4G & WLAN & WLAN & WLAN & into a number of possibilities Brdcst Ad-hoc Brdcst 2.5G &• Operators and vendors must WLAN create viable strategies to 3G+ & 4G & 3G+ & prosper within this complexity 3G & WLAN WLAN & WLAN & WLAN Ad-hoc Ad-hoc GPRS/ 4G & EDGE 3G+ WLAN (2.5G) W-CDMA 4G (3G) GSM (2G)1990 2000 2010 32
  33. 33. 3G Technology: Present &Future Perspectives India is the fastest growing and the second largest telecom market in the world. 3G networks enable network operators to offer users a wider range of more advanced services while achieving greater network capacity through improved spectral efficiency. Services include wide-area wireless voice telephony, video calls, and broadband wireless data, all in a mobile 33
  34. 34. 3G Technology: Present &Future Perspectives WiMAX is a telecommunications technology that provides wireless transmission of data using a variety of transmission modes, from point-to- multipoint links to portable and fully mobile internet access. The technology provides up to 72 Mbit/s symmetric broadband speed without the need for cables. 34
  35. 35. 3G Technology: Present &Future Perspectives This makes WiMAX a technology of choice as a backhaul for 3G, especially in a country like India where villages are far flung and isolated. 35
  36. 36. Summary 3G wireless services are rapidly spreading the global market place with CDMA as the preferred technology solution The following are the key 3G Technologies that have emerged to be the key commercial players: CDMA2000 1X CDMA2000 1xEV-DO UMTS/WCDMA 36
  37. 37. Summary WCDMA is one of them, which provides:- Larger Bandwidth – Higher Data rate – Lower cost Greater subscriber capacity IMT-2000 Radio interface standard offers 3G standard 4G still in a formative stage . Frequency bands less than 5 GHz preferred for wide-area, mobile services 4G system bandwidth between 20 and 100 MHz Lower cost per bit than 3G 37
  38. 38. References http://en.wikipedia.org/wiki/3G www.3g-generation.com www.3gtoday.com 38
  39. 39. Thank You 39

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