Cisco Cisco Packet Data Interworking Function (PDIF)
SGSN Changes in Release 17
▀ SGSN Enhancements for 17.0
▄ Release Change Reference, StarOS Release 17
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end
Notes:
on-iu-release
: This optional keyword instructs the SGSN to send Release Access Bearer upon Iu-Release in
a 3G network so that Release Access Bearer will be initiated for non-ISR and non-DT subscribers upon Iu-
Release. For ISR and DT subscribers, Release Access Bearer will be initiated unconditionally.
Release. For ISR and DT subscribers, Release Access Bearer will be initiated unconditionally.
on-ready-to-standby
: This optional keyword instructs the SGSN to send Release Access Bearer on Ready-
to-Standby transition in a 2G network so that Release Access Bearer will be initiated for non-ISR subscribers
on Ready-to-Standby transition. For ISR subscribers, Release Access Bearer will be initiated unconditionally.
on Ready-to-Standby transition. For ISR subscribers, Release Access Bearer will be initiated unconditionally.
If no optional keywords are included with the
release-access-bearer
command, then the S4-SGSN applies
Release Access Bearer for both 2G and 3G networks.
When enabled, either/both
release-access-bearer on-iu-release
or/and
release-access-bearer
on-ready-to-standby
will display in the output generated by the
show configuration [ verbose ]
command.
remove
: When included with the command,
remove
disables sending Release Access Bearer in either the
selected (with optional keyword) 2G or 3G environment or both environments (with no keyword included).
By default, Release Access Bearer initiation on Iu-Release or Ready-to-Standby transition is not enabled. When
disabled or prior to being enabled, either/both
remove release-access-bearer on-iu-release
or/and
remove release-access-bearer on-ready-to-standby
will display in the output generated by the
show configuration [ verbose ]
command.
CSCud63677, CSCui21269, CSCuh77293 - SM application changes for PGW
restart notification
Feature Changes
P-GW Restart Notification
The purpose of enabling PGW Restart Notification (PRN) in S4-SGSN is to provide a simple and optimized solution for
handling the signaling overload on SGSN when a PGW failure occurs. Until release 10, an SGW used to send Delete
Bearer Request for every PDN connection activated through the failed PGW. This will cause a signaling overload on
SGSN. Since 3GPP Release 10 specifications, it is possible for an SGW to indicate a PGW failure through a single
PGW Restart Notification message to an SGSN.
handling the signaling overload on SGSN when a PGW failure occurs. Until release 10, an SGW used to send Delete
Bearer Request for every PDN connection activated through the failed PGW. This will cause a signaling overload on
SGSN. Since 3GPP Release 10 specifications, it is possible for an SGW to indicate a PGW failure through a single
PGW Restart Notification message to an SGSN.
When an SGW detects that a peer PGW has restarted it shall delete all PDN connections bearer contexts associated with
the peer node that fails as well as freeing any internal SGW resources associated with those PDN connections.
the peer node that fails as well as freeing any internal SGW resources associated with those PDN connections.
An SGW will send PGW Restart Notification only to the SGSN's that indicated their support through the Echo Request
-> Node Features IE -> PRN bit. When the S4-SGSN receives this message, according to the control plane IP address of
the restarted PGW and the control plane IP address of the SGW on the S4 interface included in the message, S4-SGSN
should delete all PDN connection contexts associated with the SGW and the restarted PGW as well as freeing any
internal resources associated with those PDN connections.
-> Node Features IE -> PRN bit. When the S4-SGSN receives this message, according to the control plane IP address of
the restarted PGW and the control plane IP address of the SGW on the S4 interface included in the message, S4-SGSN
should delete all PDN connection contexts associated with the SGW and the restarted PGW as well as freeing any
internal resources associated with those PDN connections.
The S4-SGSN sends a PGW Restart Notification Acknowledge message in response to the PGW Restart Notification
message sent by SGW.
message sent by SGW.
Previous Behavior: PGW Restart Notification (PRN) is not enabled on S4-SGSN.
New Behavior: PGW Restart Notification is now enabled on S4-SGSN.