eling salesperson, an appliance manual for a service engineer, or a software application such as Adobe Acro- bat Reader to read documents. The source of this information could be one of the Internet communication methods such as File Transfer Protocol (FTP), telnet, http, or Java, or from a proprietary database or legacy plat- form. Irrespective of the source and type of file being transferred, this kind of application tends to be bandwidth-intensive. Therefore, it requires a high-speed mobile data service such as GPRS, EDGE, or UMTS to run sat- isfactorily across a mobile network. Home Automation Home automation applications combine remote security with remote con- trol. Basically, you can monitor your home from anywhere-on the road, on vacation, or at the office. If your burglar alarm goes off, not only are you alerted, but also you can go live and see live footage of the perpetrators. You can program your video or switch on your oven so that the preheating is complete by the time you arrive home (traffic jams permitting). Your GPRS- capable mobile phone really becomes the remote control device for our tele- vision, video, and stereo. Because the IP will soon be everywhere, these devices can be addressed and fed instructions. A key enabler for home automation applications will be Bluetooth, which enables disparate devices to interwork. Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. GPRS Introduction Chapter 2 These features and the driving motivators will propel the operators into the implementation of GPRS. Moreover, the applications will offer many new opportunities to users that were heretofore unavailable. It is no won- der that the hype of GPRS is strong now. The next approach we will look to will be the architecture of the GPRS infrastructure. This will help the reader to understand the overall architectural model used for GPRS. Dow