Gy Interface Support
Features and Terminology ▀
Cisco ASR 5x00 Packet Data Network Gateway Administration Guide ▄
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SGSN/Serving-Node change: Applicable only to GGSN and P-GW implementations.
Discarding or Allowing or Buffering Traffic to Flow
Whenever Gy is waiting for CCA from the server, there is a possibility of traffic for that particular traffic type to be
encountered in the Gy. The behavior of what needs to be done to the packet is determined by the configuration. Based
on the configuration, the traffic is either allowed to pass or discarded or buffered while waiting for CCA from the
server.
This behavior applies to all interrogation of client with server in the following cases:
No quota present for that particular category
Validity timer expiry for that category
Quota exhausted for that category
Forced Reauthorization from the server
In addition to allowing or discarding user traffic, there is an option available in case of quota exhausted or no quota
circumstances to buffer the traffic. This typically happens when the server has been requested for more quota, but a
valid quota response has not been received from the server, in this case the user traffic is buffered and on reception of
valid quota response from the server the buffered traffic is allowed to pass through.
Procedures for Consumption of Time Quota
QCT is zero: When QCT is deactivated, the consumption is on a wall-clock basis. The consumption is
continuous even if there is no packet flow.
QCT is active: When QCT is present in the CCA or locally configured for the session, then the consumption of
quota is started only at the time of first packet arrival. The quota is consumed normally till last packet arrival
plus QCT time and is passed till the next packet arrival.
If the QCT value is changed during intermediate interrogations, then the new QCT comes into effect from the
time the CCA is received. For instance, if the QCT is deactivated in the CCA, then quota consumptions resume
normally even without any packet flow. Or if the QCT is activated from deactivation, then the quota
consumption resume only after receiving the first packet after CCA.
QHT is zero: When QHT is deactivated, the user holds the quota indefinitely in case there is no further usage
(for volume quota and with QCT for time quota). QHT is active between the CCA and the next CCR.
QHT is non-zero: When QHT is present in CCA or locally configured for the session, then after a idle time of
QHT, the quota is returned to the server by sending a CCR-Update and reporting usage of the quota. On receipt
of CCR-U, the server does not grant quota. QHT timer is stopped on sending the CCR and is restarted only if
QHT is present in the CCA.
QHT timer is reset every time a packet arrives.
Envelope Reporting
The server may determine the need for additional detailed reports identifying start time and end times of specific
activity in addition to the standard quota management. The server controls this by sending a CCA with Envelope-
Reporting AVP with the appropriate values. The DCCA client, on receiving the command, will monitor for traffic for a
period of time controlled by the Quota-Consumption-Time AVP and report each period as a single envelope for each
Quota-Consumption-Time expiry where there was traffic. The server may request envelope reports for just time or time
and volume. Reporting the quota back to the server, is controlled by Envelope AVP with Envelope-Start-Time and
Envelope-End-Time along with usage information.
