Sessions
l Users typically make a sequence of requests, defined as a
“browser session”
l A wireless channel is allocated at beginning and released at
the end:
u 90 seconds timeout
u User terminates browser application
u Phone is powered off
l Problems:
u IP addresses assigned dynamically, so we cannot track users
u When session times out, new IP address may be assigned, even
though same “user session”
l Number of sessions closely follows average daily traffic
l Sessions are, on average, rather short (90% are less than
3.77 minutes)