Cisco Cisco Packet Data Gateway (PDG) Guida Dell'Amministratore
Gx Interface Support
▀ Rel. 7 Gx Interface
▄ Cisco ASR 5x00 Home Agent Administration Guide
136
In releases prior to 15.0, post the ICSR switchover, any existing session for which the PCRF has enabled volume
reporting used to continue indefinitely until the session is terminated or until CCR-U is sent for a given trigger, without
having the volume counted via Gx.
reporting used to continue indefinitely until the session is terminated or until CCR-U is sent for a given trigger, without
having the volume counted via Gx.
To summarize, after an ICSR switchover, volume reporting over Gx is no longer done for existing sessions. Also,
volume usage is not synced to standby chassis.
volume usage is not synced to standby chassis.
In 15.0 and later releases, volume threshold and volume usage are synced to standby chassis to support volume
reporting over Gx for existing sessions post switchover.
reporting over Gx for existing sessions post switchover.
Without this support it cannot cause a subscriber to use higher speeds than what s/he is supposed to get, if volume
reporting is for example used to enforce fair usage; the operator may already consider this a revenue loss. It will also
severely impact roaming subscribers who are supposed to get a notification and be blocked/redirected once the limits set
by the EU roaming regulation are reached. If a session continues now without being blocked, the operator is not allowed
to charge for data beyond the limit and will have a significant and real revenue loss (roaming partner may still charge
for the data used on their SGSNs).
reporting is for example used to enforce fair usage; the operator may already consider this a revenue loss. It will also
severely impact roaming subscribers who are supposed to get a notification and be blocked/redirected once the limits set
by the EU roaming regulation are reached. If a session continues now without being blocked, the operator is not allowed
to charge for data beyond the limit and will have a significant and real revenue loss (roaming partner may still charge
for the data used on their SGSNs).
How Rel. 7 Gx Works
This section describes how dynamic policy and charging control for subscribers works with Rel. 7 Gx interface support
in GPRS/UMTS networks.
in GPRS/UMTS networks.
The following figure and table explain the IMSA process between a system and IMS components that is initiated by the
UE.
UE.
In this example, the Diameter Policy Control Application (DPCA) is the Gx interface to the PCRF. The interface
between IMSA with PCRF is the Gx interface, and the interface between Session Manager (SessMgr) and Online
Charging Service (OCS) is the Gy interface. Note that the IMSA service and DPCA are part of SessMgr on the system
and separated in the figure for illustration purpose only.
between IMSA with PCRF is the Gx interface, and the interface between Session Manager (SessMgr) and Online
Charging Service (OCS) is the Gy interface. Note that the IMSA service and DPCA are part of SessMgr on the system
and separated in the figure for illustration purpose only.
Important:
In 14.0 and later releases, the DPCA and the IMSA will be acting as one module within the Policy
Server interface application.