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Introduction to Communication Systems
March – June 2006
Dr. P. Papadimitratos and Prof. J-P. Hubaux
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Exchanging Information
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Mobile Cellular Telephony
Exponential Growth
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The Internet
TCP/IP
FTP
HTTP
SMTP
SSL
E-CommerceSearch EnginesFile Sharing
Voice-over-IPVideo
Streaming
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The Internet (cont’d)
Movie is available here (62MB!):http://www.caida.org/publications/presentations/Ietf199712/Movie/movie.mpg
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The Internet (cont’d)
Interconnected Packet Switching Networks
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The Internet (cont’d)
Topologies of interconnected systems
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The Internet (cont’d)
Exponential Growth
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Wi-Fi: The Internet goes Wireless
Handheld
Laptop
Scanner
PDA
Wireless Access Point
Gateway to the Internet
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Pervasive Internet: Mobile Ad Hoc Networks
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Pervasive Internet: Vehicular Networks
ad ho
c
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Pervasive Internet:Sensor Networks
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The Interplanetary Internet
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An Ad Hoc Network in the Interplanetary Internet
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The Whole Picture
Wide area
Metropolitan area
Campus-wide
In-house
verticalhand-over
horizontalhand-over
Integration of heterogeneous fixed and mobile networks with varyingtransmission characteristics
Sensor Field
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2005 - 2015 : A Decade of New Challenges
Technical challenges– Dependability– Security– Mobility– Scalability– …
Global challenges:– Lack of manpower– Trend toward concentration– Usability– Privacy– …
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Challenge Example 1:Scalability - Ad Hoc network throughput
If we have:- identical randomly located nodes- each capable of transmitting bits/sThen the throughput ( ) obtainable by each node for a destination is
( )log
nW
nrandomly chosen
Wnn n
λ
λ⎛ ⎞
= Θ ⎜ ⎟⎜ ⎟⎝ ⎠
Ref: P. Gupta, P. Kumar, The Capacity of Wireless Networks IEEE Transactions on Information Theory, March 2000
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Challenge Example 2:Network Security - Viruses
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Communication Systems: a Scientific Discipline and
a Profession
Basestation
Mobilestation Server
Signal Processing
System Programming
Telecommunications
Networking
DistributedInformationSystems
Information TheoryTheory of Algorithms
Security
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Seminar Schedule
http://http://lcawww.epfl.ch/papadimitratos/CSS/index.htmllcawww.epfl.ch/papadimitratos/CSS/index.html
Credits for data, movie, and pictures
JPL
CAIDA.ORG
http://lcawww.epfl.ch/papadimitratos/CSS/index.html
Introduction to �Communication Systems��March – June 2006Exchanging InformationMobile Cellular TelephonyThe InternetThe Internet (cont’d)The Internet (cont’d)The Internet (cont’d)The Internet (cont’d)Wi-Fi: The Internet goes WirelessPervasive Internet: �Mobile Ad Hoc NetworksPervasive Internet: �Vehicular NetworksPervasive Internet:�Sensor NetworksThe Interplanetary InternetAn Ad Hoc Network �in the Interplanetary InternetThe Whole Picture2005 - 2015 : A Decade of New ChallengesChallenge Example 1:�Scalability - Ad Hoc network throughputChallenge Example 2:�Network Security - VirusesCommunication Systems: �a Scientific Discipline and �a ProfessionSeminar Schedule
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