CDPD TECHNOLOGY

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INTRODUCTION


Mobile Computing: A technology that allows transmission of data, via a computer, without having to be connected to a fixed physical link.

Principle of Mobile Computing: The ability to send and receive data across the cellular networks.

First Generation

Analog Signal Communication
Advanced Mobile Phone System (AMPS) by North America
Based on Frequency Division Multiple Access (FDMA)
1664 Channels were available.
832 downlink and 832 uplink
Bandwidth 824MHz – 849MHz


Third Generation
Designed to support high bit rate telecommunications
Multimedia applications and Internet services
144 kbps for full mobility applications
384 kbps for limited mobility applications
2 Mbps for low-mobility applications in micro- and Pico cellular environments


Standards

The International Telecommunication Union (ITU) ratified two 3G standards.
CDMA2000, which provides a bit rate of up to 2.4 Mbps
wideband CDMA (WCDMA), which provides a bit rate of up to 8 Mbps.


APPLICATIONS
For Estate Agents
Emergency Services
In courts
In companies
Stock Information Collation / Control
Credit Card Verification
Taxi/Truck Dispatch
Electronic Mail/Paging
Mobile Commerce