Radius-Based Prepaid Accounting For Wimax - Cisco ASR 5000 series Product Overview

▀ ASN Call Procedure Flows
Step Description
7 Target non-anchor ASN Gateway forwards Context-Report message to target ASN BS.
8 Target ASN BS sends Path Registration Request to target non-anchor ASN Gateway.
9 Target non-anchor ASN Gateway forwards Path Registration Request to anchor ASN Gateway.
10 Anchor ASN Gateway replies with Path Registration Response to target non-anchor ANS GW.
11 Target non-anchor ASN Gateway forwards Path Registration Response to target ASN BS.
12 Target ANS BS sends ranging response with RNG_RSP message to MS.
13 Target ASN BS sends Path Registration Acknowledge to target non-anchor ASN Gateway.
14 Target non-anchor ASN Gateway forwards Path Registration Acknowledge to anchor ASN Gateway.
15 R6 GRE data path established between Target ASN BS and anchor ASN Gateway. Data flow starts.
16 Target ASN BS sends/receives CMAC Key Count Update and Acknowledge messages to/from anchor ASN Gateway via
target non-anchor ASN Gateway.
17 Anchor ASN Gateway sends/receives Path De-Reg Req/Rsp/Ack messages to release data path to/from serving BS.
18 R6 GRE data path terminated between Serving ASN BS and anchor ASN Gateway.

RADIUS-based Prepaid Accounting for WiMax

Online accounting is set up by the exchange of RADIUS Access-Request and Access-Accept packets. The initial
Access-Request packet from the ASN GW and/or the home agent includes a prepaid accounting capability (PPAC)
vendor specific attribute too the prepaid server (PPS). This indicates support for online accounting at the ASN and/or
the home agent. If the subscriber's session requires online charging, the PPS assigns a prepaid accounting quota (PPAQ)
to the PPC with RADIUS Access-Accept packets. As the session continues, the PPC and the PPS replenish the quotas
by exchanging RADIUS packets.
Note the following:
ASN GW operates as the prepaid client (PPC).
In the case of a mobile IP call, both the ASN GW and the home agent work independently as the prepaid client.
Both the ASN GW and the home agent send online access requests to the configured RADIUS servers
independently.
Only session-based online accounting is supported.
Obtaining More Quota after the Quota is Reached
The following figure and table provide a high-level view of the steps involved in allocating additional quotas for prepaid
calls once the original quota is reached.
▄ Cisco ASR 5000 Series Product Overview
ASN Gateway Overview
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