Manual

Cisco Packet Data Serving Node (PDSN) Release 2.0

Resource Management

12.3(11)T

Figure 6 PDSN Prepaid Billing Architecture

For roaming users, the local RADIUS server in the visited network forwards AAA requests to the home

RADIUS server, using a broker RADIUS server if required. For roaming prepaid users, this requires that

the local and broker AAA servers forward the new vendor specific prepaid accounting attributes

transparently to the home RADIUS server.

In existing networks, where the home RADIUS server does not support the interface to the Prepaid

Billing Server, AR can be placed in front of the home RADIUS server to act as a proxy. In this case AR

forwards all authorization and accounting messages to /from the home RADIUS server and

communicates with the PBS. This scenario is relevant if an operator already has a RADIUS server.

While this architecture does impose some additional requirements on the RADIUS server, the interface

towards the PDSN does not change.

It is possible that an operator may want to use an existing WIN or IN based prepaid billing server. In this

situation, the PBS will interface to the external prepaid billing server.

Accounting Records

The PDSN will continue to generate per flow accounting records in the same way as it does for

non-prepaid users. However, the last Accounting Stop Request for a flow will contain the new prepaid

Vendor Specific Attributes (VSAs) for reporting the final usage.

1107

Prepaid

billing server

Home

IP network

Broker network

IP network

Home IP network,

private network,

home access

provider network

RADIUS

MOBILE IP

RADIUS

PDSN

(BSC/PCF)

Visited access provider network

RP interface