it-switched data, it takes a long time for data to arrive from the Internet server to the browser. Alternatively, users switch off the images, just access the text on the Web, and end up with text layouts on screens that are difficult to read. As such, mobile Internet browsing is better suited to GPRS. Document Sharing/Collaborative Working Mobile data facilitates document sharing and remote collaborative working. This lets different people in different places work on the same document at the same time. Multimedia applications combining voice, text, pictures, and images can even be envisaged. These kinds of applications could be useful in any problem-solving exercise such as fire fighting, combat (to plan the route of attack), medical treatment, advertising copy setting, architecture, journalism, and SO on. This collaborative working environment can be use- ful anytime a user can benefit from having the ability to comment on a visual depiction of a situation or matter. By providing sufficient bandwidth, GPRS facilitates multimedia applications such as document sharing. Audio Despite many improvements in the quality of voice calls on mobile net- works such as Enhanced Full Rate (EFR), they are still not broadcast qual- ity. In some scenarios, journalists or undercover police officers with portable professional broadcast-quality microphones and amplifiers capture inter- views with people or radio reports that they have dictated and need to send this information back to their radio or police station. Leaving a mobile phone on, or dictating to a mobile phone, would not give sufficient voice quality to enable that transmission to be broadcast or analyzed for the pur- poses of background noise analysis or voice printing, where the speech auto- graph is taken and matched against those in police storage. Because even short voice clips occupy large file sizes, GPRS or other high-speed mobile data services are needed. Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 