Lecture 1: Introduction
Professor Honggang Wang.
http://www.faculty.umassd.edu/honggang.wang/teaching.html
Email:hwang1@umassd.edu
Outline
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Reasons to take this class
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Syllabus
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Course goals
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Introduction
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Survey
Three Reasons to Take This Class
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Wireless networks and mobile computing are
everywhere, and changing our world. What is their future?
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Tons of job opportunities are available for wireless
network engineers in current job market
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Includes both lecture and hands-on project design, gain
practical experiences
Job Opportunities
Some Network Companies of Top
Fortune 500
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Fortune rank:12
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Fortune rank: 7
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2008 profit: $8.05 Billion

2008 profit: $12.87 Billion
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Avg. pay in that job: $131,703
•
•
Fortune rank: 16
2008 profit: $86.41 Billion
•
•
Fortune rank: 244
Avg. pay in that job: $102,030
QUALCOMM
Syllabus
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See handout
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What to learn?
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The fundamental theory
Practical experiences
Class Goals
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Understand challenges and opportunities
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Learn both fundamentals and applications of wireless
networking and mobile computing
Obtain hands-on experiences through research projects
(e.g., protocol design, wireless and mobile device
development)
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7
Introduction
Goal of Wireless Networks
and Mobile Computing
“People and their machines should be able to access
information and communicate with each other easily and
securely, in any medium or combination of media – voice,
data, image, video, or multimedia – any time, anywhere, in
a timely, cost-effective way.”
Dr. G. H. Heilmeier, Oct 1992
9
Wireless Networks
and Mobile Computing
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Two aspects of mobility:
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user mobility: users communicate (wireless) “anytime, anywhere, with anyone”
device portability: devices can be connected anytime, anywhere to the network
Wireless vs. mobile
Examples
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stationary computer
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notebook in a hotel
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wireless LANs in historic buildings
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Personal Digital Assistant (PDA)
The demand for mobile communication creates the need for integration of
wireless networks into existing fixed networks:
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local area networks: standardization of IEEE 802.11
Internet: Mobile IP extension of the internet protocol IP
wide area networks: e.g., internetworking of GSM and ISDN,VoIP over WLAN
and POTS
Enabling Technologies
Development and deployment of wireless/mobile technology
and infrastructure
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in-room, in-building, on-campus, in-the-field, MAN, WAN
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Miniaturization of computing machinery
. . . -> PCs -> laptop -> PDAs/smart phones -> embedded
computers/sensors
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Improving device capabilities/software development
environments, e.g.,
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11
andriod: http://code.google.com/android/
iphone: http://developer.apple.com/iphone/
windows mobile
Mobile devices
Pager
• receive only
• tiny displays
• simple text
messages
PDA
• graphical displays
• character recognition
• simplified WWW
Laptop/Notebook
• fully functional
• standard applications
Sensors,
embedded
controllers
www.scatterweb.net
Mobile phones
• voice, data
• simple graphical displays
Smartphone
• tiny keyboard
• simple versions
of standard applications
performance
No clear separation between device types possible
(e.g. smart phones, embedded PCs, …)
Mobile and Wireless Services – Always Best
Connected
LAN, WLAN
780 kbit/s
GSM 53 kbit/s
Bluetooth 500 kbit/s
UMTS Rel. 5
400 kbit/s
LAN
100 Mbit/s,
WLAN
54 Mbit/s
UMTS,
DECT
2 Mbit/s
GSM/EDGE 135 kbit/s,
WLAN 780 kbit/s
GSM 115 kbit/s,
WLAN 11 Mbit/s
UMTS Rel. 6
400 kbit/s
At Home
WiFi
satellite
WiFi
WiFi 802.11g/n
UWB
WiFi
bluetooth
cellular
On the Move
Source: http://www.ece.uah.edu/~jovanov/whrms/
Wearable Health Monitoring Application
(ECG) through Wireless Networks
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Low cost wireless ECG
medical sensor device
has been built and
tested to trace ECG
signal through wireless
networks. Then patients
can freely walk around
while patients can be
monitored from
Traditional ECG system
anywhere!!!
Wireless ECG system
Wearable Patient Monitoring Application
(ECG) Through Wireless Networks
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Wearable Resilient Electrocardiogram (ECG)
networked sensor device used for patient monitoring
Wireless ECG medical sensor
Software GUI interface
On the Road
GSM/UMTS,
cdmaOne/cdma2000,
WLAN, GPS
DAB, TETRA, ...
road condition,
weather,
location-based services,
emergency
Course Coverage
Application
Application
Transport
Transport
Network
Network
Data Link
Data Link
Data Link
Data Link
Physical
Physical
Physical
Physical
Radio
Network
Network
Medium
Often we need to implement a function across multiple layers.
Survey
Reference
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http://zoo.cs.yale.edu/classes/cs434/schedule.html
Mobile Communication book