hin the window of size Tx, and no receive time slots shall occur between transmit time slots within a TDMA frame. Table 2-1 shows the types of multislot terminals and the way they have been categorized. The 29 different classes and options are shown in this table. 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 GPRS Introduction Table 2-1 Multislot Maximum Number of Slots Minimum Number of Slots Twenty-nine Class Classes of Mobile Terminals a = 1 with frequency hopping 0 without frequency hopping b = 1 with frequency hopping or changing Rx to Tx 0 without frequency hopping and no changing Rx to Tx = 1 with frequency hopping or changing from Tx to Rx 0 without frequency hopping and no changing from Tx to Rx 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 Applications for GPRS Many applications fit into the mode of GPRS and IPs. These applications are merely a means to an end. In other scenarios, the features and applica- tions can be met with other technologies. The issue at hand is that the use of GPRS facilitates these applications and drives the acceptance ratio. It is easy to say that we can do anything with GPRS, but it is more practical to say at a minimum that we can do the following. Chat can be distinguished from general information services because the source of the information is a person with the chat protocol, whereas it tends to be from an Internet site for information services. The information intensity, the amount of information transferred per message, tends to be lower with chat, where people are more likely to state opinions than factual data. In the same way as Internet chat groups have proven to be a very