Cisco Cisco Packet Data Gateway (PDG)
S-GW Changes in Release 17
S-GW Enhancements for 17.0 ▀
Release Change Reference, StarOS Release 17 ▄
589
CSCum79565 - MTC-Feature: CDR support for including LAPI (signaling
priority)
Feature Changes
CDR Support for Including LAPI (Signaling Priority)
This feature is related to M2M support. 3GPP has added the LAPI (signaling priority) indication being sent in the GTP
messages, to indicate that the PDN is a low priority bearer and thus can be treated accordingly. Changes are done to
support this indication in S-GW/P-GW/SAEGW. APN backoff timer support based on LAPI indication is not yet
supported, and is planned for a future release.
messages, to indicate that the PDN is a low priority bearer and thus can be treated accordingly. Changes are done to
support this indication in S-GW/P-GW/SAEGW. APN backoff timer support based on LAPI indication is not yet
supported, and is planned for a future release.
3GPP has also added a new AVP in CDR defined in TS 32.298 named “lowPriorityIndicator”. If S-GW/P-GW receives
LAPI indicator in GTP, SGW-CDR and PGW-CDR generated will contain LAPI indication.
LAPI indicator in GTP, SGW-CDR and PGW-CDR generated will contain LAPI indication.
The benefit of this feature is that it provides support for carrying the LAPI attribute in SGW-CDR and PGW-CDRs, so
that billing system can then accordingly bill for that PDN.
that billing system can then accordingly bill for that PDN.
CSCum88387 - Graceful PDN Shutdown
Feature Changes
Intelligent Graceful Shutdown Support for VoLTE Calls
In 16.0, the Graceful Shutdown feature was added. There are likely to be cases where an Operator would need to
shutdown a P-GW/S-GW/SAEGW for upgrade/maintenance purpose, while doing so there is a need for a means by
which the VoLTE calls on such nodes are cleaned up in a graceful manner, so that ongoing calls are not interrupted, thus
improving user experience.
shutdown a P-GW/S-GW/SAEGW for upgrade/maintenance purpose, while doing so there is a need for a means by
which the VoLTE calls on such nodes are cleaned up in a graceful manner, so that ongoing calls are not interrupted, thus
improving user experience.
In 16.0 an external script or manual effort was needed to do graceful shutdown by executing the enhanced “clear
subscriber” CLI (“clear subscriber non-volte”). In 17.0, complete automation of Graceful shutdown is performed so that
there is no need for an external script or manual intervention.
subscriber” CLI (“clear subscriber non-volte”). In 17.0, complete automation of Graceful shutdown is performed so that
there is no need for an external script or manual intervention.
CSCum88401, CSCum65507 - Packet drop timer for Volte bearer
Feature Changes
Packet Drop Timer for VoLTE Bearer
A Packet Drop Timer for VoLTE bearers has been implemented. Previously, the S-GW dropped data packets for a
configurable time period upon receiving DDN failure notification for a call. The same timer period was applicable
across all bearers. Now this time period can be made configurable on the basis of the QCI and/or ARP value of the
bearer. This will help to have more aggressive paging for some QCIs and/or ARPs as compared to others. This will help
mainly for IMS calls, where for IMS signaling bearers with specific QCI-ARP operators can have a lower time period
for IMS signaling bearer as compared to other bearers, in order to increase the likelihood of a UE response after
returning from out of coverage.
configurable time period upon receiving DDN failure notification for a call. The same timer period was applicable
across all bearers. Now this time period can be made configurable on the basis of the QCI and/or ARP value of the
bearer. This will help to have more aggressive paging for some QCIs and/or ARPs as compared to others. This will help
mainly for IMS calls, where for IMS signaling bearers with specific QCI-ARP operators can have a lower time period
for IMS signaling bearer as compared to other bearers, in order to increase the likelihood of a UE response after
returning from out of coverage.