Volume-based services are sold based on upload or download data volume. For the demo application, volume is defined as the sum of the upload and download volumes. A real implementation might distinguish between the two for accounting purposes.
When it authorizes a volume-based prepaid service, the account server sets an interim update interval according to the following formula:
The maximum bandwidth is the greater of the two plug-in attributes upstreamBandwidth and downstreamBandwidth. If you do not specify values for these attributes, then the maximum bandwidth defaults to 1 Mbps.
When the session start is signaled, the account server locks the account.
When an interim update is signaled, the account server updates the interim update interval based on the account balance and the current consumption. It compares the volume used so far in the session with the remaining volume. If the session volume is greater than the remaining volume, the account server sets the session timeout to zero to stop the session.
If the session volume is less than the remaining volume, the interim update interval is recalculated, and no further action takes place until the end of that interval.
The interim update interval must be larger than a specified minimum value; the demo application employs a minimum of 5 minutes. This feature enables accounts to be overdrawn by an amount equal to the maximum bandwidth times the minimum time.
When the session stop is signaled, the account server updates the account based on the volume counters and unlocks it.
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