MOB 1 intro 2010 lập trình mobi

Internet & Mobile Communications Master 1 - Spring 2010 MI 021 Ho Chi Minh Ville Anne Fladenmuller Assistant Professor – UPMC (France) Internet & Mobile Communications - 2010 2 Overview of the lecture –  Introduction   Use-cases, applications   Definition of terms   Challenges, history –  Wireless Transmission   frequencies & regulations   signals, antennas, signal propagation   Link budget   multiplexing, modulation, spread spectrum, cellular system –  Media Access   motivation, SDMA, FDMA, TDMA (fixed, Aloha, CSMA, DAMA, PRMA, MACA, collision avoidance, polling), CDMA –  Wireless LANs   Basic Technology –  Wireless PANs   IEEE 802.11a/b/g, .15, Bluetooth –  Network Protocols   DHCP   Mobile IP   Ad-hoc networking   Routing –  Transport Protocols   Reliable transmission   Flow control   Quality of Service Internet & Mobile Communications - 2010 3 Bibliography   Course mostly based on –  the book :   "Mobile Communications", Addison-Wesley de Jochen Schiller –  Other reference books :   « Data and computer communications », William Stallings   « Réseaux de mobiles et réseaux sans fil » Khaldoun Al Agha, Guy Pujolle, Guillaume Vivier   « Wi-fi par la pratique», Guy Pujolle, Davor Malès –  Several Tutorials :   Vadia Nitin   Gwendal Le Grand Internet & Mobile Communications - 2010 4 Computers for the next decades?   Computers are more and more integrated –  small, cheap, portable, replacable - no more separate devices   Technology is in the background –  computer are aware of their environment and adapt (“location awareness”) –  computers recognize the location of users and react appropriately (e.g., call forwarding, fax forwarding, “context awareness”))   Advances in technology –  more computing power in smaller devices –  Heterogeneous devices and diverse capacities –  flat, lightweight displays with low power consumption –  new user interfaces due to small dimensions –  more bandwidth per cubic meter –  multiple wireless interfaces: wireless LANs, wireless PANs, wireless WANs, regional wireless telecommunication networks etc. (“overlay networks“) Internet & Mobile Communications - 2010 5 Number of wireless clients in the world Market of mobile telephony between 1999 and 2003 0 50 100 150 200 250 300 350 1999 2000 2001 2002 2003 Year Millions of units North America Europe Asia - Pacific - Japan South America Middle East - Africa total Wifi chips   The number of Wifi chips sold in 2008 reached 387 millions of unit for all market areas. + 52% for the Wi-Fi telephony market. + 51 % for the printing market. + 23% for the notebook, laptops (144 millions unit). + 33% for the mobile devices market (MID, camera, audio players , video players …) (71 millions unit) Stable for the game market, set-top-boxes,… According to the Wi-Fi Alliance and In-Stat, the increase should reach 12% for laptop market. Internet & Mobile Communications - 2010 6 Internet & Mobile Communications - 2010 7 Commercial market of WLANs (ABI Research). !   Increasing number of Wi-Fi hotspots in 2006" –  Up to 143 700 access points in the world, growth of 47 % compared to 2005." –  74 % of Wi-Fi Access Points are in North America and Europe" –  Forecast : In 2011, the Asia Pacific area should overtake Europe and North America in terms of number of Access Points." –  In Europe: "   First market for Wi-Fi, with 57 000 Access points. "   Growth mostly in commercial areas which set up free Wi-Fi access. Typical example : McDonald's, which has equipped 17 % of its 4000 fastfoods." –  Hotel sector : currently the biggest market in the world"   nearly 40 000 Access Points worldwide. "   future : Voice over IP through wireless connections"   In 2010, ABI foresees more than 109 000 Wi-Fi AP for this particular market." –  Promissing commercial benefits before the effective use of Wimax technologies." Vietnamese Market   German market research group, GFK predicted in 2008 that around 320,000 laptops ought to be sold in Vietnam for that year, doubling that of 2007   HCM City currently has around five providers of wireless services. –  FPT Telecom is the most outstanding player with a US$1.5 million project to develop a Wifi city initiated in June 2007. –  Telecom’s wireless Internet services now cover most banks, hotels and luxurious restaurants in inner HCM City (5,000 points). –  Viettel Mobile has begun testing wireless Internet services by providing free services in some districts in Hanoi and HCM City. –  Two CDMA-based mobile networks, S-Fone and EVN Telecom, are implementing wireless Internet services. No standard wireless model though Wifi is praised for its business potentials, telecom firms are hesitating to develop Wifi. Most of them are just testing services Internet & Mobile Communications - 2010 8 Vietnamese Market   Operator’s view –  “After an experimental period, we see space barriers and we are seeking better solutions for these,” said Viettel’s Deputy Director in charge of technology, Hoang Son. –  S-Fone’s wireless Internet service for mobile phone is praised for its good quality but the charges are still high. –  For EVN Telecom, though the service is wireless, users have to use a slow dial-up connection.   Security is a problem for wireless Internet services as it is said that hackers can attack computers through Wifi system. –  Some service providers have warned that as wireless services in Vietnam are in a trial period and there is no standard security model users must protect themselves. Internet & Mobile Communications - 2010 9 Wireless telephony in France –  Autorité de régulation des télécoms (Arcep) MI021 – « Internet Mobile et Ambiant » - 2010 10 [...]... end of 2 010 ) France : Arcep (Autority dof regulation of communications) : Licences allocated in 2 010 and sold in 2 011 14 - Sprectrum of 2,6 GHz Band (military) should be freed by 2 010 and 2 012 - Spectrum of 800 MHz Band (television and army) freed by december 2 011 MI0 21 – « Internet Mobile et Ambiant » - 2 010 Internet Market 15 MI0 21 – « Internet Mobile et Ambiant » - 2 010 Internet Market 16 MI0 21 – «... number of smartphones 11 MI0 21 – « Internet Mobile et Ambiant » - 2 010 Wireless in the world 12 MI0 21 – « Internet Mobile et Ambiant » - 2 010 Growth of the 3G+   In Europe, forecast for of the growth of 3G+ telephony (CCS Insight) 2009 Estimation for2 011 subscribers 22 millions 43 millions incom 6 billions of € 11 milliards of € 13 MI0 21 – « Internet Mobile et Ambiant » - 2 010 Long Term Evolution... standardisation of W -LAN/MAN/PAN technologies IEEE 802 .11 , .15 , 16 , Internet: extensions of Mobile IP to the IP protocol Wide area networks Internet & Mobile Communications - 2 010 Different aspects of mobility   Mobile computing refers to different aspects : –  Terminals mobility Wireless connection between a mobile terminal and an access point or between several mobile terminals   Maintain the connection when... the mobile station, no handover, 80% coverage, in 19 71: 11 000 customers 19 72: evolution : analog, 16 0MHz, connection setup from the fixed network too (but location of the mobile station has to be known) goal: pan-European digital mobile phone system with roaming 19 83 Start of the American AMPS (Advanced Mobile Phone System, analog) 19 84 CT -1 standard (Europe) for cordless telephones Internet & Mobile... Users mobility Identify a user whichever terminal or network he uses   User profiles should always be recognised   –  Service mobility   –  20 Allow adaptation of the service to the operating environment Session mobility   Allow to pause and restart a session on different environments Internet & Mobile Communications - 2 010 Mobile Communications   Two aspects of mobility: –  –      Wireless vs mobile... UMTS auctions/beauty contests 20 01 Start of 3G systems –  Cdma2000 in Korea, UMTS in Europe, Foma (almost UMTS) in Japan Internet & Mobile Communications - 2 010   20 01: start of WiMax (Worldwide Interoperability for Microwave Access) – 802 .16 2003: 802 .11 g (amendment) 2007: first draft for 802 .11 n …   Moving fast…       36 Internet & Mobile Communications - 2 010 ... beginning 19 98 Specification of GSM successors –    ETSI, standardization of type 1: 5 .15 - 5.30GHz, 23.5Mbit/s recommendations for type 2 and 3 (both 5GHz) and 4 (17 GHz) as wireless ATM-networks (up to 15 5Mbit/s) for UMTS (Universal Mobile Telecommunication System) as European proposals for IMT-2000 Iridium –  66 satellites (+6 spare), 1. 6GHz to the mobile phone 34 Internet & Mobile Communications - 2 010 ... „follow“ the mobile device through the fixed network Privacy –  who should gain knowledge about the location Internet & Mobile Communications - 2 010 Applications   The ultimate goal : overlay networks integration of heterogeneous networks Fixed and mobile with different caracteristics area Vertical handover city campus 26 home Horizontal handovers Internet & Mobile Communications - 2 010 Mobile devices... –  J Maxwell (18 31- 79): theory of electromagnetic Fields, wave equations (18 64) –  H Hertz (18 57-94): demonstrates with an experiment the wave character of electrical transmission through space (18 86, in Karlsruhe, Germany, at the location of today’s University of Karlsruhe) 30 Internet & Mobile Communications - 2 010 History of wireless communication I   18 95 Guglielmo Marconi –  –    19 07 Commercial... & Mobile Communications - 2 010 History of wireless communication III   19 91 Specification of DECT –  –    Digital European Cordless Telephone (today: Digital Enhanced Cordless Telecommunications) 18 80 -19 00MHz, ~10 0-500m range, 12 0 duplex channels, 1. 2Mbit/s data transmission, voice encryption, authentication, up to several 10 000 user/km2, used in more than 50 countries 19 92 Start of GSM –  –  –  . Internet Mobile et Ambiant » - 2 010 14 Internet Market MI0 21 – « Internet Mobile et Ambiant » - 2 010 15 Internet Market 16 MI0 21 – « Internet Mobile et Ambiant » - 2 010 Commercial Wifi market. in 2 010 and sold in 2 011 . - Sprectrum of 2,6 GHz Band (military) should be freed by 2 010 and 2 012 - Spectrum of 800 MHz Band (television and army) freed by december 2 011 MI0 21 – « Internet Mobile. Increased number of smartphones MI0 21 – « Internet Mobile et Ambiant » - 2 010 11 Wireless in the world MI0 21 – « Internet Mobile et Ambiant » - 2 010 12 Growth of the 3G+   In Europe,