V. WWW PERFORMANCE
The workload used for this measurement was generated
to model a user having a laptop connected to the GPRS terminal
and surfing on the Internet as he would do having
a fixed network connection. The pages were chosen using
statistics of popular sites. The MS Internet Explorer was
used to generate the workload. It supports three parallel
TCP connections and it uses HTTP version 1.1.
Today, most web pages are designed for data services
with higher data rates. Downloading this kind of large pages
would lead to high response times and will probably not be
acceptable for GPRS users. Even over ISDN most pages
were retrieved within 15 seconds, which is reasonable for a
start page (most of the objects of the following pages will be
cached). With GPRS it took up to 100 seconds, which is not
acceptable for Internet users (see Figure 8). This high response
time can be explained by the large number of WWW
objects that leads to a large number of separate TCP connections.
These measurement results are again close to the
GPRSIM results for WWW throughput performance (see
Figure 9), which are based on a different traffic model (see
Section VI) with smaller pages that is more typical for
GPRS usage.