Cisco Cisco Packet Data Interworking Function (PDIF)
Evolved Packet Data Gateway Overview
Features and Functionality ▀
ePDG Administration Guide, StarOS Release 18 ▄
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Supported Triggers for ePDG-CDRs Charging Information Addition
The "List of Traffic Volumes” attribute of the ePDG-CDR consists of a set of containers, on encountering the following
trigger conditions, the charging information will be added to the container:
trigger conditions, the charging information will be added to the container:
Qos Change: A change in the QoS will result to open the “List of Traffic Data Volumes” container being closed and
added to the CDR and a new bearer specific container is opened. Also when there is a Change in QoS, the trigger will be
sent to accounting module for CDR information addition using the API "sessmgr_acct_api_event(handle, params)" with
the params ---> qos_change set from the sessmgr.
added to the CDR and a new bearer specific container is opened. Also when there is a Change in QoS, the trigger will be
sent to accounting module for CDR information addition using the API "sessmgr_acct_api_event(handle, params)" with
the params ---> qos_change set from the sessmgr.
Tariff time: On reaching the Tariff Time Change open “List of Traffic Data Volumes” containers is closed and added to
the CDR. Tariff-time change is to add charging information to CDR during a particular tariff-time of day.
the CDR. Tariff-time change is to add charging information to CDR during a particular tariff-time of day.
Record Closure: Open “List of Traffic Data Volumes” containers is closed and added to the ePDG-CDR.
Supported Triggers for ePDG-CDR closure
The following events trigger closure and sending of ePDG-CDR:
Time Limit: CDRs are generated after every x seconds where x is the configured time limit.
Max container Triggers: Maximum number of charging condition changes (QoS/tariff time change). CDRs are
generated when the max bucket limit is reached. By default its 4.
generated when the max bucket limit is reached. By default its 4.
Volume limit trigger: CDRs are generated whenever the uplink or downlink data volume for the session crosses the
configured uplink, downlink or total limit.
configured uplink, downlink or total limit.
Management Intervention: CDRs can be generated by management intervention such as clear command issued by the
operator to cleanup a session.
operator to cleanup a session.
Assumptions and Limitations
The AP-MAC address will be populated in ePDG-CDR only when it is supplied by UE during initial IKEv2
exchange in IDi payload as expected by ePDG. Please see the ePDG admin guide to understand the format of
IDi payload with AP-MAC address encoded in it.
IDi payload with AP-MAC address encoded in it.
The CDF functionality is integrated within ePDG. RF interface is not support.
UE Local IP Address IE in the S2B Interface over GTPv2
This chapter describes UE Local IP Address IE in the S2B Interface over GTPv2 feature, below are the links to main
sections of the document:
sections of the document:
The location of the UE initiating a VoWifi call via ePDG will be identified based on the UE local IP address reported on
S2B interface. This location information can be used for multiple purposes like billing and lawful interception etc.
S2B interface. This location information can be used for multiple purposes like billing and lawful interception etc.
Below is the specifications of the “UE Local IP Address IE in the S2B Interface over GTPv2” feature:
ePDG saves the UE local IP address (SRC address of the IKE messages received from UE) and the port (SRC
port of the IKE message received from UE) and send them to PGW over S2B interface.
The port information must be sent on S2B interface only when a NAT is detected between UE and ePDG (UE is
behind a NAT).
CLI configuration is supported to control the inclusion of the UE local IP Address and port on the S2B interface.
The above functionality needs to be supported only for GTPv2 based S2B interface.
How It Works
This section describes signaling flow during an ePDG session setup procedure.