Cisco Cisco Packet Data Gateway (PDG)
SGSN Changes in Release 17
SGSN Enhancements for 17.0 ▀
Release Change Reference, StarOS Release 17 ▄
563
New Behavior: The “Unexpected Data value” (UDV) is a valid error cause in response to Check IMEI request in MAP
version 1 only. “Data missing” along with “Unknown equipment” and “System Failure” are valid error causes from
MAP version 2 onwards. A new failure cause “Data Missing” has been added for Check IMEI Request in the
version 1 only. “Data missing” along with “Unknown equipment” and “System Failure” are valid error causes from
MAP version 2 onwards. A new failure cause “Data Missing” has been added for Check IMEI Request in the
show map
statistics
output.
Performance Indicator Changes
show map statistics
The following failure cause has been added in the
show map statistics
output in response to Check IMEI requests:
Data Missing
CSCup82824 - New disconnect reason for MM APN based congestion control
Feature Changes
Disconnect Reason for MM APN-based Congestion Control
This work is done as part of the functionality supporting the SGSN’s machine type communications (MTC) overload
control mechanisms support in this release, please refer to CSCum47774, CSCum50056.
control mechanisms support in this release, please refer to CSCum47774, CSCum50056.
New Behavior: The SGSN now supports a new disconnect reason mm-apn-congestion-control(567) that will be
pegged when Attach or new Inter-SGSN RAU calls are rejected because of APN-based Mobility Management
congestion control. Statistics will be displayed when issuing the show session disconnect-reasons [verbose | sgsn-only
| gprs-only] command.
pegged when Attach or new Inter-SGSN RAU calls are rejected because of APN-based Mobility Management
congestion control. Statistics will be displayed when issuing the show session disconnect-reasons [verbose | sgsn-only
| gprs-only] command.
CSCup99278 - Support for supported features negotiation with HSS is required
Feature Changes
Supported-features Negotiation with HSS
Previous Behavior: Supported-features were not negotiated with the HSS; the SGSN sent a hardcoded list of
supported-features to the HSS during ULR.
supported-features to the HSS during ULR.
New Behavior: Now the SGSN will negotiate the supported-features values with the HSS during ULR/ULA.
If the first ULA responds with diameter error code 5011, then the SGSN selects common features supported by both the
SGSN and the HSS - selection based on comparison of feature lists at the SGSN and the HSS. And, then a new ULR
will be initiated with an updated feature list value. The negotiated supported-features value will be sent in all subsequent
messages.
SGSN and the HSS - selection based on comparison of feature lists at the SGSN and the HSS. And, then a new ULR
will be initiated with an updated feature list value. The negotiated supported-features value will be sent in all subsequent
messages.
Feature list negotiation will happen only once, so if the ULA for the 2nd ULR has an error response, then the call will
be rejected.
be rejected.