By Christoffer Andersson
Deals programming builders a glance at how GPRS and 3G platforms have developed, and what's in shop for his or her destiny. The CD-ROM contains WAP improvement kits, emulators of present cellular units, trying out templates, and Java SDKs.
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Extra info for GPRS and 3G wireless applications professional developer's guide
The Need for Packet Data Why do we need packet data, and what is packet data really? As the Wireless Application Protocol (WAP) began to spread throughout the world during 2000, some users complained that it was slow, expensive, and cumbersome to use. The fact is that most of the characteristics of WAP over GSM that users complained about were not due to bad WAP performance; instead, these problems are typical for circuit-switched networks. A circuit -switched connection to some site works just like a regular telephone call.
Rather, a basic understanding makes it easier to follow the reasoning of operators and handset and infrastructure vendors. 1 shows a sample mobile system. This system shows a mobile system with three Base Transceiver Stations (BTS), one Base Station Controller (BSC), and one Mobile Switching Center (MSC). This figure also shows three mobile stations (MSs). S. state, there are several thousands of BTSs. The BTSs are commonly called base stations, and sometimes the acronym RBS, Radio Base Station, is used.
Other technologies must evolve in parallel, however— technologies that can operate independently of EDGE, cdmaOne, WCDMA, and so on. We commonly call these technologies bearers, and they enable the transport of information over the air. In order to transport information over a bearer, there must be mechanisms for deciding how and where to send the information. ” These protocols also can make sure that the information is received reliably and in order. The World Wide Web Consortium (W3C) standardizes most of the Internet protocols, and there is currently work going on to improve protocols such as TCP in order to better handle the wireless environments.