By Dipl.-Ing. Dr. Manfred Taferner, Dipl.-Ing. Dr. Ernst Bonek (auth.)
The publication offers a finished research of the functionality and difficulties of the Transmission keep an eye on Protocol/Internet Protocol (TCP/IP) protocol stack, whilst facts is transmitted over GSM, GPRS and UMTS. It offers an advent into the protocols used for net entry at the present time and in short into the instant software Protocol, WAP. the fundamentals of GSM, GPRS and UMTS are given worthwhile for figuring out the most subject, TCP functionality over GSM, GPRS and UMTS. We then describe at size the issues that TCP has whilst working over a cellular radio hyperlink, and what has been proposed to therapy those difficulties. We derive the optimal TCP packet size for optimum facts throughput on instant networks, analytically and via simulation. effects at the throughput and diverse different parameters of TCP over cellular networks are given. This booklet provides precious recommendation to community operators and alertness programmers tips to maximise facts throughput, and which protocols, transmission modes, and coding schemes to want and which to prevent to accomplish this goal.
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Extra resources for Wireless Internet Access over GSM and UMTS
Example text
The WWW model specifies a dient-server architecture. The dient requests information from a server that answers with a response (see also Sect. 1). Normally no other entity is involved in the communication path 15 . The WAP model specifies also a dient-server architecture with an additional gateway in the communication path between dient and server (Fig. 14). Between the dient and the gateway encoded communication by means of the WAP protocol stack is accomplished. The gateway translates requests from the WAP stack to the WWW protocol stack and sends it further on to the origin server.
Possible way of comparing the Internet protocol stack with the WAP protocol stack. 5 Wireless Application Protocol, WAP ISO/OSI Application Presentation II Internet HTML I HTIP SesSion Transport Network DataJink PhySicaJ JavaScnpt (MIME) TLS - SSL TCP UDP IP IDCMP IP Transmission over ... ) Content Formats (images, ... ) Session Layer (HTIP functionality) Transaction Layer (WTP) Security Layer (WTLS) Transport Layer (WDP) Bearer services (GSM-GPRS. GSM-SMS, 1S-136•... ) Fig. 23. Another possible way of comparison of the Internet protocol stack with the WAP protocol stack.
Protocols for Internet Access Analogous to the logical interpretation in a computer system, the user agents can be considered as the 'programs' that interpret the 'data' (services and formats) in a specified manner. In the following we will provide a very brief description of the basic WAE services and formats. com), a founder of the WAP-Forum. WML has been developed for optimized presentation of content and for user interaction on devices with limited capabilities. It is specified in [139]. e.
