Cisco Cisco Packet Data Gateway (PDG)
MME Service Configuration Mode Commands
isda-guard-timeout ▀
Command Line Interface Reference, StarOS Release 17 ▄
7219
isda-guard-timeout
Sets the number of seconds for the Insert Subscription Data Answer (ISDA) guard timer. The time 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.
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.
Product
MME
Privilege
Administrator
Mode
Exec > Global Configuration > Context Configuration > MME Service
configure > context context_name > mme-service service_name
Entering the above command sequence results in the following prompt:
[context_name]host_name(config-mme-service)#
Syntax
[ no ] isda-guard-timeout seconds
no
Disables any configuration for this timer and resets the wait time to the default of 25 seconds.
seconds
Enter an integer from 1 to 100.
Usage
With this command, the operator can configure the ISDA guard timer to any value from 1 to 100 seconds.
Upon expiry of this wait timer, the MME sends the ISDA with the last-known location of the UE if the MME
receives the Insert Subscriber Data Response (ISDR) with both the location flags set (current and last-known
locations). Only when the ISDR is received, with both flags set, is the ISDA guard timer started. 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.
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.
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.
This timer is separate from the paging timer and configuration of the ISDA guard timer can reduce the overall
delay before sending the ISDA.
Upon expiry of this wait timer, the MME sends the ISDA with the last-known location of the UE if the MME
receives the Insert Subscriber Data Response (ISDR) with both the location flags set (current and last-known
locations). Only when the ISDR is received, with both flags set, is the ISDA guard timer started. 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.
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.
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.
This timer is separate from the paging timer and configuration of the ISDA guard timer can reduce the overall
delay before sending the ISDA.
Example
Instruct the MME to wait
10
seconds before sending the ISDA with the last-known location of the UE:
isda-guard-timeout 10