1.1.4. Conclusion

When we discuss network capabilities under the aspect of mobile browsers, the most challenging performance criterion is the user perceived browsing speed. This browsing speed in fact is mainly influenced by the two network capabilities delay and bandwidth. For the two available technologies: GSM Phase 2 Circuit Switched Data (CSD) bearer service and GSM Phase 2+ General Packet Radio Service (GPRS) bearer service the delay figures and available bandwidth are summarised below:

Note: Most of the time, web browsing can be categorised as an interactivity client server application. For this type of application, the bandwidth delay product is crucial for the user perceived performance of the application. Due to the high mean and 95 % delay values, which have been standardised for the three GPRS QoS classes, interactive web applications might experience severe performance degradation, within the GPRS network also enough bandwidth is available. This problem can be visualised by the overall water carrying characteristic of a river. Often a very brought river also flows very slowly (see GPRS), thus the overall amount of water which flows down the river at a certain time is much lower compared to a river of small (see GSM CSD) or medium size (see GSM HSCSD), where the water flow is much faster.

Consequently web pages which shall be accessible by mobile browsers, shall contain lite content and only very few objects. As browsers execute an HTTP GET command for each embedded object, which takes several RTT before being displayed.

Copyright © 2001-2003 by Rainer Hillebrand and Thomas Wierlemann