Gx Interface Support
▀ Time Reporting Over Gx
▄ Cisco ASR 5x00 Packet Data Network Gateway Administration Guide
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6.
The PCEF continues to track time usage after the threshold is reached and before a new threshold is provided by
the PCRF. If a new usage threshold is not provided by the PCRF in the acknowledgement of an IP-CAN
Session modification where its usage was reported, then time monitoring does not continue in the PCEF for
that IP CAN session.
Limitations
This section lists the limitations for Time Reporting over Gx in this release.
Only integer monitoring key will be supported like Volume Reporting over Gx
If the same monitoring key is used for both time and data volume monitoring then disabling monitoring key will
disable both time and data usage monitoring.
If the same monitoring key is used for both time and data usage monitoring and if an immediate report request is
received, then both time and volume report of that monitoring key will be sent.
Usage Monitoring
Two levels of time usage reporting are supported:
Usage Monitoring at Session Level
Usage Monitoring at Flow Level
Usage Monitoring at Session Level
PCRF subscribes to the session level time reporting over Gx by sending the Usage-Monitoring-Information AVP with
the usage threshold level set in Granted-Service-Unit AVP and Usage-Monitoring-Level AVP set to SESSION_LEVEL
(0).
Usage Monitoring at Flow Level
PCRF subscribes to the flow level time reporting over Gx by sending the Usage-Monitoring-Information AVP with the
usage threshold level set in Granted-Service-Unit AVP and Usage-Monitoring-Level AVP set to
PCC_RULE_LEVEL(1). Monitoring Key is mandatory in case of a flow level monitoring since the rules are associated
with the monitoring key and enabling or disabling of usage monitoring at flow level can be controlled by PCRF using it.
Usage monitoring is supported for both predefined rules and dynamic rule definition.
Usage Monitoring for Predefined and Static Rules
If the usage monitoring needs to be enabled for the predefined rules, PCRF sends the rule and the usage monitoring
information containing the monitoring key and the usage threshold. The monitoring key should be same as the one pre-
configured in PCEF for that predefined rule. There can be multiple rules associated with the same monitoring key.
Hence enabling a particular monitoring key would result in the time being tracked for multiple rules having the same
monitoring key. Similarly, usage monitoring information is sent from PCRF for the static rules also.
Usage Monitoring for Dynamic Ruledefs
If the usage monitoring needs to be enabled for dynamic ruledefs, PCRF provides the monitoring key along with a
charging rule definition and the usage monitoring information containing the monitoring key and the usage threshold.
This results in the usage monitoring being done for all the rules associated with that monitoring key.