Cisco Cisco Packet Data Gateway (PDG)
SGSN Changes in Release 17
SGSN Enhancements for 17.0 ▀
Release Change Reference, StarOS Release 17 ▄
551
sgtpu-rnc-byts-rcvd-bk
sgtpu-sgsn-byts-rcvd-bk
CSCum67205, CSCup61646 - S6d AVP support for MTC feature
Feature Changes
Extended T3312 Timer
This work is done as part of the SGSN’s MTC support in this release, please refer to CSCum47774, CSCum50056.
Previous Behavior: The SGSN did not support sending Extended T3312 timer value in Attach Accept and/or RAU
Accept messages.
Accept messages.
New Behavior: The SGSN supports the Extended T3312 timer value for Attach Accept and/or RAU Accept messages
if the MS indicates support for extended periodic timer in the MS Network Feature Support.
if the MS indicates support for extended periodic timer in the MS Network Feature Support.
With this release, for both Gn-SGSN and S4-SGSN a longer periodic RAU timer can be assigned to the M2M UEs
based on subscription. The following timer AVP is now supported for the “Subscribed Period TAU/RAU Timer”via the
SGSN’s S6d interface: Subscribed-Period-RAU-TAU-Timer AVP. The Subscribed Period TAU/RAU Timer value can
be included in the ISD (Insert Subscriber Data) from the HLR or in the ULA (Update Location Answer) from the HSS.
based on subscription. The following timer AVP is now supported for the “Subscribed Period TAU/RAU Timer”via the
SGSN’s S6d interface: Subscribed-Period-RAU-TAU-Timer AVP. The Subscribed Period TAU/RAU Timer value can
be included in the ISD (Insert Subscriber Data) from the HLR or in the ULA (Update Location Answer) from the HSS.
The maximum value for a standard T3312 timer value is 186 minutes and the new Extended T3312 timer maximum
value is 18600 minutes. Using the longer value for routing area updates reduces network load from periodic RAU
signaling.
value is 18600 minutes. Using the longer value for routing area updates reduces network load from periodic RAU
signaling.
Important:
Now, despite enabling the Extended T3312 timer in the SGSN’s configuration, the SGSN may be
prevented from sending the Extended T3312 timer value in messages as the SGSN now also supports the “Subscribed
Periodic TAU/RAU Timer Withdrawn" flag (see CSCuo92276 for details).
Periodic TAU/RAU Timer Withdrawn" flag (see CSCuo92276 for details).
Important:
Now for both Gn-SGSN and S4-SGSN, no matter the configuration for the Extended T3312 timer,
the SGSN no longer automatically sends Extended T3312 timer values in Attach/RAU Accept messages when
offloading is enabled.
offloading is enabled.
Command Changes
gmm Extended-T3312-timeout
A new
gmm
command keyword,
Extended-T3312-timeout
, enables the operator to determine how the SGSN handles
Extended T3312 timer values in a 2G GPRS network environment.
configure
context context_name
gprs-service service_name
gmm Extended-T3312-timeout { value exT3312_minutes | when-subscribed } [ low-
priority-ind-ue ]
priority-ind-ue ]