Mob 1 intro 2010

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Internet & Mobile Communications
Master 1 - Spring 2010
MI 021
Ho Chi Minh Ville
Anne Fladenmuller
Assistant Professor – UPMC (France)
Overview of the lecture
– Introduction – Wireless LANs
 Use-cases, applications  Basic Technology
 Definition of terms – Wireless PANs
 Challenges, history  IEEE 802.11a/b/g, .15,
– Wireless Transmission Bluetooth
 frequencies & regulations – Network Protocols
 signals, antennas, signal  DHCP
propagation  Mobile IP
 Link budget
 Ad-hoc networking
 multiplexing, modulation, spread
 Routing
spectrum, cellular system
– Transport Protocols
– Media Access
 Reliable transmission
 motivation, SDMA, FDMA, TDMA
(fixed, Aloha, CSMA, DAMA,  Flow control
PRMA, MACA, collision avoidance,  Quality of Service
polling), CDMA
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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
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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
4 WANs, regional wireless telecommunication networks etc. (“overlay
networks“) Internet & Mobile Communications - 2010
Number of wireless clients in the world
Market of mobile telephony between 1999
and 2003
350 North America
Millions of units
300
250 Europe
200
150 Asia - Pacific - Japan
100
50 South America
0
Middle East - Africa
1999 2000 2001 2002 2003
Year total
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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.
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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
7 technologies.
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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
8 potentials, telecom firms are hesitating to develop Wifi. Most of
them are just testing services
Internet & Mobile Communications - 2010
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
9 users must protect themselves.
Internet & Mobile Communications - 2010
Wireless telephony in France
– Autorité de régulation des télécoms (Arcep)
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Increased number of smartphones
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Wireless in the world
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Growth of the 3G+
 In Europe, forecast for of the growth of 3G+
telephony (CCS Insight).
2009 Estimation
for2011
subscribers 22 millions 43 millions
incom 6 billions of € 11 milliards of €
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Long Term Evolution
 Average annual growth rate (conseil Pyramid Research)
– Motorola : + 404 % between 2010 and 2014,
– Estimation of 136 millions of subscribers by the end of 2014. (growth of
UMTS/HSPA subscribers was of 100 millions in 6 years)
 Goal: transfert of high speed data with a longer transmission range,
higher number of user per cell and lower latency.
USA/ Sweeden/ … : An offer is set up for 2010 (Ericsson : HSPA (3G) network
with very high speed (84 Mbits/s) over Danemark other major cities in
Sweeden before the end of 2010)
France : Arcep (Autority dof regulation of communications) : Licences
allocated in 2010 and sold in 2011.
- Sprectrum of 2,6 GHz Band (military) should be freed by 2010 and 2012
- Spectrum of 800 MHz Band (television and army) freed by december 2011
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Internet Market
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Internet Market
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Commercial Wifi market (ABI Research).
 Increase of the number of WiFi hotspots
– 2008 : Paris noticed an increase of 534%
of its public and professionnal Wi-Fi connexion.
 400free hotspots in Paris
 London remain the most connected city with12.276 connexion
area in the city
 In Europe : important increase in commercial centers with setting up of free Wi-Fi.
Example : McDonaldʼs (1 sur 2 à Paris)
– In2006 :
 143 700 access points in the world, +47 % compared to 2005.
 74 % of this wifi points are in North America and Europe
– Forecast:
 In 2011, South Pacific should overtake Europe and America in terms of number
of access points.
 Hotels: First user ofe WiFi in the world. Promissing market since VoIP is
progresing.
– In 2010, ABI foresee more than 109 000 WiFi AP for this area.
 2013 : forecast of wifi market x4 (ABI)
17  Promissing market, until LTE/WiMAX is being deployed ?
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WiMAX (Worldwide Interoperability for Microwave Access)
WiMAX available in 2 solutions:
– fixed WiMAX (within a building…)
– mobile WiMAX (connection of « nomad » clients).
Device maker
10 000 Wimax base station delivered by Motorola
 Annual growth rate of 40 % since the delivery of the first
WiMAX access points in 2007
802.16m (WiMAX Release 2) is the next generation for this
high speed mobile technology.
– In the USA
 Consortium : Sprint and Clearwire planed an investment of 10 billions
of $
– In Europe
 WiMAX and similar services are restricted to areas with no or very little
high-speed wired connectivity. LTE (long term evolution) seems to be
18 the natural evolution of HSPA
MI021 – « Internet Mobile et Ambiant » - 2010
Introduction
Fixed telephony : Internet :
stable market Growing market
Cellular :
growing market
Evolution of
wired telephony :
• GSM
More services • Wireless ATM
• GPRS/EDGE • IP/IPv6
• IEEE 802.11
• UMTS/ • WDM
• Bluetooth
IMT2000 • IP with/without QoS
• Wimax
• 4 G
– The development of wireless interfaces generates a need for
integration :
 standardisation of W -LAN/MAN/PAN technologies IEEE 802.11,.15, .
16,
19  Internet: extensions of Mobile IP to the IP protocol
 Wide area networksInternet & Mobile Communications - 2010
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 users are on the move
 Allow handover and paging
– Users mobility
 Identify a user whichever terminal or network he uses.
 User profiles should always be recognised
– Service mobility
 Allow adaptation of the service to the operating environment
– Session mobility
 Allow to pause and restart a session on different environments
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