Cisco Cisco Packet Data Interworking Function (PDIF)
MME Changes in Release 17
▀ MME Enhancements for 17.4
▄ Release Change Reference, StarOS Release 17
254
Command Changes
isda-guard-timeout
This new command in the MME Service configuration mode enables the operator to set the number of seconds the
MME waits for current location information for the UE. If the current location is not learned before expiry, because
there is no paging response or location reporting control from the eNB, then the MME sends the ISDA with the last-
known location upon expiry of this timer.
MME waits for current location information for the UE. If the current location is not learned before expiry, because
there is no paging response or location reporting control from the eNB, then the MME sends the ISDA with the last-
known location upon expiry of this timer.
configure
context context_name
mme-service service_name
[ no ] isda-guard-timeout seconds
end
Notes:
no
at the beginning of a command disables any configuration for this timer and resets the wait time to the
default of 25 seconds.
Only when the ISDR is received with both location flags (current and last-known locations) set is the ISDA
guard timer started. Upon expiry of this wait timer, the MME sends the ISDA with the last-known location of
the UE.
the UE.
In situations where the MME receives the ISDR with only the last-known location flag set, then the MME
immediately sends the ISDA with location information - no delay and this timer is not started even if
configured.
configured.
When the ISDA guard timer expires, the paging procedure does not stop until the page timer expires but the
MME ignores the paging timer and sends the ISDA with the last-known location if the ISDR was received with
both location flags set and the UE is in EMM-idle mode.
both location flags set and the UE is in EMM-idle mode.
While the MME is serving the ISDR (where both location flags are set) from the HSS, if the HSS tries to send
another similar request then the MME responds to the HSS with DIAMETER_UNABLE_TO_COMPLY.
Performance Indicator Changes
show mme-service all
A new field has been added to the output generated by this command to show the configuration for the ISDA guard
timer. The following is an example of the display if the timer were configured for 2 seconds:
timer. The following is an example of the display if the timer were configured for 2 seconds:
Isda guard timeout : 2s