Download - Introduction to Mobile Computing & GSM
![Page 1: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/1.jpg)
Introduction to Mobile Computing & GSM
![Page 2: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/2.jpg)
Mobility
• What is Mobility????• Both Physical & Virtual objects are now Mobile– Physical – Movements of matter– Virtual – Movements of bits and bytes
• User Mobility- Access to Similar Communication device at different Places
• Device Portability- Communication device moves with or without user
![Page 3: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/3.jpg)
What is Mobile Computing
![Page 4: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/4.jpg)
Frequencies for Communication
![Page 5: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/5.jpg)
Propagation Modes
![Page 6: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/6.jpg)
![Page 7: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/7.jpg)
Frequencies & Regulations
![Page 8: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/8.jpg)
Categories of devices
• Communication Device can exhibit thus one of the following characteristics– Fixed & Wired– Mobile & Wired– Fixed & Wireless– Mobile & Wireless
![Page 9: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/9.jpg)
Evolution of Wireless Data
• 1G – Analog Technology- FDMA. Ex.- AMPS• 2G – Digitized Technology – FDMA + TDMA. Ex.-
GSM• Both the above are circuit switched• 2.5G – Voice is circuitized but data is packetized
– FDMA + TDMA. Ex.- GPRS• 3G – Spread Spectrum technique for media
access & encoding. Both data & voice are packetized.
![Page 10: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/10.jpg)
Multiplexing
![Page 11: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/11.jpg)
Frequency Multiplexing
![Page 12: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/12.jpg)
Time Multiplexing
![Page 13: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/13.jpg)
Time & Frequency Multiplexing
![Page 14: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/14.jpg)
Code Multiplexing
![Page 15: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/15.jpg)
Spread Spectrum Technique
![Page 16: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/16.jpg)
Cell Structure
![Page 17: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/17.jpg)
Frequency Planning
![Page 18: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/18.jpg)
GSM
• GSM• formerly: Groupe Spéciale Mobile (founded
1982)• now: Global System for Mobile Communication
( Since 1991)• Types of GSM• GSM 900• GSM 1800• GSM 1900
![Page 19: Introduction to Mobile Computing & GSM](https://reader035.vdocuments.mx/reader035/viewer/2022081504/563db7fc550346aa9a8f7fc2/html5/thumbnails/19.jpg)
GSM Architecture & Entities