Class notes
Mobile computing module
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THIS MODULE DESCRIBES THE MOBILE COMMUNICATIONS PROCESS FROM SATELLITES and other applications
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Mount Kenya UniversityP.O. Box 342-01000 Thika
Email: info@mku.ac.ke
Web: www.mku.ac.ke
DEPARTMENT OF INFORMATION
TECHNOLOGY
COURSE CODE: BIT 4203
COURSE TITLE: MOBILE COMPUTING
Instructional manual for BBIT – Distance Learning
, TABLE OF CONTENT
TABLE OF CONTENT ...................................................................................................................................... 2
COURSE OUTLINE .......................................................................................................................................... 6
CHAPTER ONE: INTRODUCTION TO COMPUTER NETWORKING ................................................................. 11
Definitions ............................................................................................................................................... 11
Network Topologies ................................................................................................................................ 16
Network Protocols .................................................................................................................................. 20
Open System Interconnection(OSI) Protocol .......................................................................................... 21
Network Operating Systems ................................................................................................................... 22
Switching Techniques ............................................................................................................................. 25
Multiplexing ............................................................................................................................................ 30
Analog and Digital Data transmission ..................................................................................................... 34
Chapter Review Questions ...................................................................................................................... 37
CHAPTER TWO: INTRODUCTION TO MOBILE COMPUTING AND WIRELESS COMMUNICATION................ 38
Introduction ............................................................................................................................................ 38
Definitions ............................................................................................................................................... 39
Mobile Computing Advantages............................................................................................................... 40
Limitations of mobile computing ............................................................................................................ 41
Chapter Review Questions ...................................................................................................................... 44
CHAPTER THREE: MOBILE COMPUTING ARCHITECTURE ............................................................................ 45
Introduction ............................................................................................................................................ 45
Public switched telephone network ....................................................................................................... 45
Data Communications............................................................................................................................. 49
Cellular Digital Packet Data (CDPD) Technology ..................................................................................... 50
Specialized Mobile Radio ........................................................................................................................ 57
, General Packet Radio Service (GPRS) ..................................................................................................... 58
GPRS Network Architecture ............................................................................................................... 63
Advanced Mobile Phone System ............................................................................................................ 66
Digital - Advanced Mobile Phone System (D-AMPS) .............................................................................. 68
GSM (Global System for Mobile communication) .................................................................................. 69
High-Speed Circuit-Switched Data (HSCSD) ............................................................................................ 87
EDGE (Enhanced Data GSM Environment) ............................................................................................. 87
Chapter Review Questions ...................................................................................................................... 88
CHAPTER FOUR: WIRELESS TECHNOLOGIES ............................................................................................... 89
WiFi ......................................................................................................................................................... 89
WiFi Hotspots .......................................................................................................................................... 91
Building a Wireless Network ................................................................................................................... 92
WAP......................................................................................................................................................... 94
The Cellular Explosion ............................................................................................................................. 94
Wireless Markup Language..................................................................................................................... 95
Wireless Application Protocol ................................................................................................................. 96
The Evolution of Wireless Network Security .......................................................................................... 98
Wireless Mesh Networks ...................................................................................................................... 100
Wireless Mesh Technology ................................................................................................................... 102
Applications for Wireless Mesh Networks ............................................................................................ 103
Wireless Internet Cards for Laptops, Desktops and PDAs .................................................................... 109
Comparing Wireless Internet Connection Cards .................................................................................. 110
Wireless Networks ................................................................................................................................ 111
Chapter Review Questions .................................................................................................................... 112
CHAPTER FIVE: SATELLITES ....................................................................................................................... 114
, Introduction to Satellites ...................................................................................................................... 114
Whose Satellite Was the First to Orbit Earth? ...................................................................................... 115
How Is a Satellite Launched into an Orbit? ........................................................................................... 116
Orbital Velocity and Altitude ................................................................................................................ 117
What Is a Satellite Launch Window? .................................................................................................... 119
How Are Satellite Orbits Predicted? ..................................................................................................... 122
Satellite Altitudes .................................................................................................................................. 122
80 to 1,200 miles -- Asynchronous Orbits ........................................................................................ 122
3,000 to 6,000 miles -- Asynchronous Orbits ................................................................................... 123
6,000 to 12,000 miles - Asynchronous Orbits................................................................................... 123
22,223 Miles - Geostationary Orbits ................................................................................................. 125
What Is AMSAT?.................................................................................................................................... 126
Satellite Internet ................................................................................................................................... 127
Global Positioning System (GPS) ........................................................................................................... 129
Chapter Review Questions .................................................................................................................... 135
CHAPTER SIX: VOICE OVER INTERNET PROTOCOL (VoIP) ......................................................................... 136
Introduction to VoIP.............................................................................................................................. 136
Using VoIP ............................................................................................................................................. 137
Circuit Switching ................................................................................................................................... 139
Packet Switching ................................................................................................................................... 140
Advantages of Using VoIP ..................................................................................................................... 141
Disadvantages of Using VoIP................................................................................................................. 143
Chapter Review Questions .................................................................................................................... 145
CHAPTER SEVEN: BLUETOOTH .................................................................................................................. 146
Introduction to bluetooth ..................................................................................................................... 146
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