User's Manual

1-56
Lucent Technologies – Proprietary
See notice on first page
401-703-454
FOA Draft Issue 1
January, 2006
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Overview of the Flexent‚ Modular Cell 4.0B cabinet
installation
Accessing the internet
Each time a user accesses the Internet, either a dynamic Internet
Protocol (IP) address is assigned to the user, or the user asserts its own
static IP address. The dynamic IP address is assigned for the duration of
the Internet session by the PDSN, which is operated as a Home Agent
(HA) for the Internet Service Provider (ISP). As its agent, the ISP
allocates the PDSN to open an Internet session with a petitioning AT, in
the 1xEV-DO system, or a 3G mobile in a 3G1X system.
Prior to allowing an AT/3G mobile network access, the AT/3G mobile
is challenged for authentication to determine if the AT/3G mobile is not
masquerading under a false ID, and also for authorization to determine
if the AT/3G mobile is permitted (authorized) to access the network.
This challenge is implemented by the Authentication, Authorization
and Accounting (AAA) server via a server/client relationship with the
PDNS client. The AAA maintains a subscriber database which is used
to validate the user’s ID and password. The PDSN records AT/3G
mobile data usage to provide accounting information to the AAA
Server.
The IP address defines a physical location on the Internet. When an IP
session is established with an AT/3G mobile, the most significant digits
of the IP address, which are listed in the Internet routing tables, are
used to direct Internet data traffic associated with the AT/3G mobile to
and from the PDSN. The PDSN maps the AT/3G mobile to the IP
address so that data reaching the PDSN is directed to the AT/3G
mobile. Therefore, no matter where the user may go on the Internet, the
IP address ensure that response data is routed back to the uses via the
PDSN.