Cisco Cisco Packet Data Gateway (PDG)
MME Changes in Release 17
MME Enhancements for 17.0 ▀
Release Change Reference, StarOS Release 17 ▄
317
A new disconnect-reason bulk statistic has been added to the System schema. The following counter is incremented
when UE contexts created to handle NTSR DDNs are destroyed when the UE re-attaches.
when UE contexts created to handle NTSR DDNs are destroyed when the UE re-attaches.
disc-reason-587
show session disconnect-reasons verbose
A new session disconnect-reason counter has been added to track the number of times UE contexts created to handle
NTSR DDN's are destroyed when the UE re-attaches.
NTSR DDN's are destroyed when the UE re-attaches.
ue-ctxt-normal-del-ntsr-ddn(587)
CSCum37443, CSCum67205 - MTC Support : Subscribed periodic TAU times
Feature Changes
Subscribed Periodic TAU Timer
Important:
Correction in 17.2 for this content. The extended-t3412 timer was incorrectly documented as the
extended-3412 timer - this error has been corrected in the text below in the 17.2 publicatoin cycle.
This feature helps the MME to reduce network load from periodic TAU signaling and to increase the time until the UE
detects a potential need for changing the RAT or PLMN.
detects a potential need for changing the RAT or PLMN.
The feature enables the Operator to configure longer values for the periodic TAU timer and Mobile Reachable timer
using new commands on the MME.
using new commands on the MME.
A new configuration is supported under the MME Service to define an EMM extended-t3412 timer value in seconds.
Refer to the Command Changes section below for more information.
Refer to the Command Changes section below for more information.
The UE must include the “MS network feature support” IE in the Attach Request/TAU Request. This IE indicates to the
MME that the UE supports the extended periodic timer T3412, in which case the MME sends the extended-t3412 IE
(T3412_E) in the attach/TAU response. The MME will not forward the extended-t3412 timer value to any UE which
has not indicated that it supports this extended-t3412 timer.
MME that the UE supports the extended periodic timer T3412, in which case the MME sends the extended-t3412 IE
(T3412_E) in the attach/TAU response. The MME will not forward the extended-t3412 timer value to any UE which
has not indicated that it supports this extended-t3412 timer.
The MME supports storing the Subscribed-Periodic-RAU-TAU-Timer value if received as part of subscription data, and
deleting this stored value if the corresponding withdrawal flag is received in the DSR command.
deleting this stored value if the corresponding withdrawal flag is received in the DSR command.
For homers, the MME will send the extended-t3412 IE value as received in Subscribed-Periodic-RAU-TAU-Timer IE
in subscription data.
in subscription data.
For roamers, the MME takes the presence of Subscribed-Periodic-RAU-TAU-Timer IE in subscription data as an
indication and shall send the extended-t3412 IE with the value from the local configuration.
indication and shall send the extended-t3412 IE with the value from the local configuration.
The MME adjusts the configured mobile reachability timer value if the subscribed extended-t3412 timer value received
from HSS is greater than the sum of the mobile reachability timer + implicit detach timer such that the extended-t3412
timer value becomes 10% less than the mobile reachability timer + implicit detach timer.
from HSS is greater than the sum of the mobile reachability timer + implicit detach timer such that the extended-t3412
timer value becomes 10% less than the mobile reachability timer + implicit detach timer.
Refer to 3GPP TS 23.401 Section 4.3.17.3 (Version 10.4.0) & 29.272 for more details.
Command Changes
emm