This command defines the GPRS mobility management parameters for the
SGSN service.
Privilege
Security Administrator, Administrator
Mode
Exec > Global Configuration > Context Configuration > SGSN
Service Configuration
configure > context
context_name
> sgsn-service
service_name
Entering the above command sequence results in the following prompt:
[context_name]host_name(config-sgsn-service)#
Syntax
gmm { [ Extended-T3312-timeout { value exT3312_minutes | when-subscribed } [ low-priority-ind-ue ] ] | T3302-timeout t3302_dur | T3312-timeout t3312_dur | T3313-timeout initial t3313_init [ decrease t3313_decrement | increase t3313_increment ] | T3322-timeout t3322_dur | T3323-timeout T3323_dur | T3350-timeout t3350_dur | T3360-timeout t3360_dur | T3370-timeout t3370_dur | implicit-detach-timeout secs | max-auth-retransmission auth_retrans | max-identity-retransmission id_retrans | max-page-retransmission page_retrans | max-ptmsi-reloc-retransmission ptmsi_reloc_retrans | mobile-reachable-timeout ms_reach_dur | paging-failure-action downlink-data-lockout-timer seconds [ repeat number_repeats ] | perform-identity-on-auth-failure | purge-timeout minutes | t3346 min minimum max maximum | trau-timeout trau_dur }
default gmm { T3302-timeout | T3312-timeout | T3313-timeout | T3322-timeout | T3323-timeout | T3350-timeout | T3360-timeout | T3370-timeout | implicit-detach-timeout | max-auth-retransmission | max-identity-retransmission | max-page-retransmission | max-ptmsi-reloc-retransmission | mobile-reachable-timeout | perform-identity-on-auth-failure | purge-timeout | trau-timeout }
no gmm {Extended-T3312-timeout | implicit-detach-timeout | max-auth-retransmission | max-identity-retransmission | perform-identity-on-auth-failure | t3346 }
default
Sets the default value for the specified parameter.
Extended-T3312-timeout
This keyword enables the operator to determine how the SGSN handles
Extended T3312 timer values in a 3G UMTS network environment.
- value
: This keyword instructs the SGSN to send the defined
Extended T3312 timer value in Attach or RAU Accept messages to the MS if the
subscriber has a subscription for the Extended T3312 timer (Subscribed Periodic
RAU/TAU Timer in ISD) and indicates support for the extended periodic timer via
the MS Network Feature Support.
- exT3312_minutes
: Enter an integer from 0 to 18600 to identify the
number of minutes for the timeout; default is 186 minutes.
- when-subcribed : This keyword instructs
the SGSN to only send the extended T3312 period RAU timer value in Attach or
RAU Accept messages if the SGSN receives the timeout value in an ISD when the
MS has indicated support in MS Network Feature Support.
- low-priority-ind-ue : This keyword
instructs the SGSN to include the extended T3312 timer value only if the
Attach/RAU Request messages include a LAPI (low access priority indicator) in
the "MS Device Properties".
- no : This command filter instructs the
SGSN to remove the extended T3312 configuration from the SGSN Service
configuration.
T3302-timeout
t3302_dur
Default: 10
Specifies the retransmission timer value to guard the GPRS attach or
RAU procedure on MS side.
t3302_dur is the waiting duration in minutes
before retransmitting the specific message and must be an integer from 1
through 186.
T3312-timeout
t3312_dur
Default: 54
Specifies the retransmission timer value to guard the RAU procedure
initiation on network side.
t3312_dur is the waiting duration in minutes
before retransmitting the specific message and must be an integer from 1
through 186.
T3313-timeout initial
t3313_init [
decrease
t3313_decrement |
increase
t3313_increment ]
Default: 5
Specifies the retransmission timer value to guard the for paging
request procedure initiation on network side.
initial
t3313_init - Specifies the initial wating
duration in seconds before retransmitting the specific message.
t3313_init must be an integer from 1 through
60.
decrease
t3313_decrement - Specifies the decrement of
the initial timer value in seconds.
t3313_decrement must be an integer from 1
through 5.
increase
t3313_increment - Specifies the increment of
the initial timer value in seconds.
t3313_decrement must be an integer from 1
through 5.
T3322-timeout
t3322_dur
Default: 6
Specifies the retransmission timer value to guard the GPRS detach
request procedure on network side.
t3322_dur is the waiting duration in seconds
before retransmitting the specific message and must be an integer from 1
through 20.
T3323-timeout
T3323_dur
Default: 54
Specifies that the S4-SGSN Idle Mode Signaling Reduction T3323-timeout
deactivation timer will be sent to the UE in Attach Accept and Routing Area
Update Accept Messages.
T3323_dur specifies the amount of time, in
minutes, that will transpire before the UE deactivates the ISR feature if the
UE is no longer in the UMTS coverage area and has not completed a Routing Area
Update with the S4-SGSN within the specified time duration. Once the timer
expires, the S4-SGSN waits an additional four minutes before beginning an
Implicit Detach for the UE and sends a Detach Notification message (cause =
local detach) to the MME across the S3 interface. The MME will then deactivate
ISR for the UE since it now also is aware that the UE is no longer in the UMTS
coverage area. Valid entry is an integer from 1 to 186.
This command is available only if the
Idle Mode Signaling Reduction license is enabled on the
S4-SGSN and the Idle Mode Signaling Reduction feature has been activated via
the
idle-mode-signaling-reduction command in
Call Control Profile Configuration Mode.
T3350-timeout
t3350_dur
Default: 6
Specifies the retransmission timer value to guard the GPRS attach
accept/RAU accept/realloc request procedure sent with P-TMSI and/or TMSI on
network side.
t3350_dur is the waiting duration in seconds
before retransmitting the specific message and must be an integer from 1
through 20.
T3360-timeout
t3360_dur
Default: 6
Specifies the retransmission timer value to guard the authentication
and cipher request procedure on network side.
t3360_dur is the waiting duration in seconds
before retransmitting the specific message and must be an integer from 1
through 20.
T3370-timeout
t3370_dur
Default: 6
Specifies the retransmission timer value to guard the identity request
procedure on network side.
t3370_dur is the waiting duration in seconds
before retransmitting the specific message and must be an integer from 1
through 20.
implicit-detach-timeout
secs
Default: 3600
Specifies the implicit detach timer (IDT) timeout value for any 3G
calls (not specific to ISR activated calls) as part of the implicit detach
procedure on the network side. The IDT starts after expiry of the mobile
reachable timer (MNR). Soon after IDT expiry, the subscriber is implicitly
detached from the SGSN.
secs
value must be an integer from 1 to 86400.
Important
|
From R15.0 release onwards the lowest configurable limit of the IDT
timeout is modified to "240" seconds.
|
max-auth-retransmission
auth_retrans
Default: 4
Specifies the maximum retransmission of authentication requests
allowed.
auth_retrans is the number of retries before
declaring the authentication failure and must be an integer from 1 through 10.
max-identity-retransmission
id_retrans
Default: 4
Specifies the maximum retransmission of identity requests allowed.
id_retrans is the number of retries before
declaring the identity failure and must be an integer from 1 through 10.
max-page-retransmission
page_retrans
Default: 5
Specifies the maximum retransmission of page requests allowed.
id_retrans is the number of retries before
declaring the paging request failure and must be an integer from 1 through 5.
max-ptmsi-reloc-retransmission
ptmsi_reloc_retrans
Default: 5
Specifies the maximum retransmission for P-TMSI relocation procedure
allowed.
id_retrans is the number of retries before
declaring the P-TMSI relocation procedure failure and must be an integer from 1
through 10.
mobile-reachable-timeout
ms_reach_dur
Default: 58
Specifies the timeout duration for the mobile reachable timer (MNR)
for the mobile reachable procedure on network side.
impli_detach_dur sets the waiting duration
in minutes before retransmitting the specific message and must be an integer
from 4 through 1440.
paging-failure-action
downlink-data-lockout-timer
seconds [ repeat
number_repeats
]
Default: 1000 seconds.
Enables and configures the downlink data lockout timer, for the SGSN
services, to reduce the frequency of mobile-initiated keep alive messages.
seconds set the number of seconds before
timer expire, range of 0 to 10000.
repeat
number_repeats
optionally sets the number of times (1 to 10) that the timer restarts after
paging failure.
Note: If repeat is not configured then paging proceeds endlessly
until the MR timer expires.
[ default | no ] gmm paging-failure-action
disables the downlink data lockout timer.
perform-identity-on-auth-failure
Default: Enabled
Configures the SGSN service to perform an identity check to ascertain
the IMSI after an authentication failure on a PTMSI-based message.
Beginning with Release 19.2, a new default behavior has the SGSN
initiate the Identity Procedure
- (1) on receiving authentication failure with cause "GSM
Authentication Unacceptable" from a 3G subscriber during an Attach/RAU, or
- (2) on receiving authentication failure with cause "MAC failure"
during 2G ISRAU.
purge-timeout
minutes
Default: 10080 (7 days)
The purge timer defines the MM-context lifetime, part of the
MM-context procedure on the network side. The configured value sets the
duration (number of minutes) the SGSN holds the detached subscriber's
MM-context profile. If the subscriber does not reattach to the SGSN during this
time, then the SGSN purges this detached subscriber's MM-context information
from its database and sends a MAP purge request towards the HLR to indicate
that the subscribers profile is gracefully purged from SGSN's database.
minutes must be an integer from 1 through
20160.
t3346
This keyword enables the mobility management (MM) T3346 back-off timer
for the 3G service. When the SGSN is confronted by a situation involving
congestion, the SGSN can assign the back-off timer value to the UEs and
requests the UEs not to access the network for a given period of time.
min
minimum : Enter an integer
from 1 to 15 to identify the minimum number of minutes that the timer will run;
default is 15 minutes.
max maximum : Enter
an integer from 1 to 30 to identify the maximum number of minutes the timer can
run; default is 30 minutes.
- If an Attach Request or RAU Request or Service Request is rejected
due to congestion, then the T3346 value will be included in the reject message
with GMM cause code 22 (congestion). The MM back-off timer value sent will be
chosen randomly from within the configured T3346 timer value range.
- The timer will be ignored if an Attach Request or RAU Request is
received after congestion has cleared.
- If T3346 timer value is configured in a Call-Control Profile then
that value will override the back-off timer values defined for this SGSN
Service configurations.
trau-timeout
trau_dur
This timer is available in releases 9.0 and higher.
Default: 30
Specifies the number of seconds the "old" 3G SGSN waits to purge the
MS's data. This timer is started by the "old" SGSN after completion of the
inter-SGSN RAU.
trau_dur : Must be an integer from 5 to 60.
Usage Guidelines
Repeat this command as needed to configure multiple parameters for
GPRS mobility management in a UMTS network. This command provides the
configuration of timers for mobility procedures and retries for different
messages. GMM layer is defined in the 3GPP TS 24.008 (Release 7).
Example
Following command configures the timer to wait for
5 mins before retransmitting the message for
GPRS attach or RAU procedure on MS side with maximum number of retries as
6 for authentication:
gmm T3302-timeout 5 max-auth-retransmission 6
Feedback