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Timer (EPS Mobile Management - UE Side)

 

Following table comes from 24.301 - 10.2 Timers of EPS mobility management (Table 10.2.1: EPS mobility management timers UE side)

TIMER
NUM.

TIMER
VALUE

STATE

CAUSE OF START

NORMAL STOP

ON
EXPIRY

T3402 Default 12 min.
NOTE 1
EMM DEREGISTERED
EMM REGISTERED
At attach failure and the attempt counter is equal to 5.
At tracking area updating failure
and the attempt counter is equal to 5.
ATTACH REQUEST sent TRACKING AREA UPDATE REQUEST sent Initiation of the attach procedure or TAU procedure
T3410 15s EMMREGISTEREDINITIATED ATTACH REQUEST sent ATTACH ACCEPT received
ATTACH REJECT received
Start T3411 or T3402 as described in subclause 5.5.1.2.6
T3411 10s EMM DEREGISTERED.
ATTEMPTING TO-ATTACH EMM REGISTERED.
ATTEMPTING TO-UPDATE
At attach failure due to lower layer failure, T3410 timeout or attach rejected with other EMM cause values than those treated in subclause 5.5.1.2.5.
At tracking area updating failure due to lower layer failure, T3430 timeout or TAU rejected with other EMM cause values than those treated in subclause 5.5.3.2.5.
ATTACH REQUEST sent
TRACKING AREA UPDATE REQUEST sent
Retransmission of the ATTACH REQUEST or TRACKING AREA UPDATE REQUEST
T3412 Default 54 min.
NOTE 2
NOTE 5
EMM REGISTERED In EMM-REGISTERED, when
EMM-CONNECTED mode is left.
When entering state EMM DEREGISTERED
or
when entering EMM-CONNECTED mode.
Initiation of the periodic TAU procedure
T3416 30s

EMM REGISTERED INITIATED
EMM REGISTERED
EMM DEREGISTERED INITIATED
EMM-TRACKINGAREA UPDATING INITIATED

EMM-SERVICE REQUEST INITIATED

RAND and RES stored as a result of a UMTS authentication challenge SECURITY MODE COMMAND received
SERVICE REJECT received
TRACKING AREA UPDATE ACCEPT received
AUTHENTICATION REJECT received
AUTHENTICATION FAILURE sent
EMM DEREGISTERED
or
EMM-NULL entered
Delete the stored RAND and RES
T3417 5s EMM-SERVICEREQUESTINITIATED SERVICE REQUEST sent EXTENDED SERVICE
REQUEST sent in case f and g in subclause 5.6.1.1
Bearers have been set up
SERVICE REJECT received
Abort the procedure
T3417ext 10s EMM-SERVICEREQUESTINITIATED EXTENDED SERVICE REQUEST sent in case d in
subclause 5.6.1.1
EXTENDED SERVICE REQUEST sent in case e in
subclause 5.6.1.1 and the CSFB response was set to "CS fallback
accepted by the UE"
Inter-system change from S1 mode to A/Gb mode or Iu mode is completed
Inter-system change from S1 mode to A/Gb mode or Iu mode is failed
SERVICE REJECT received
Abort the procedure
T3418 20s EMM REGISTEREDINITIATED
EMM REGISTERED
EMM-TRACKINGARE AUPDATINGINITIATED
EMM DEREGISTEREDINITIATED
EMM-SERVICEREQUESTINITIATED
AUTHENTICATION FAILURE (EMM cause = #20 "MAC failure"
or #26 "non-EPS authentication unacceptable") sent
AUTHENTICATION REQUEST received On first expiry, the UE should consider the network as false
T3420 15s EMM REGISTERED INITIATED
EMM REGISTERED
EMM DEREGISTERED INITIATED
EMM-TRACKINGAREA UPDATING INITIATED
EMM-SERVICE REQUEST INITIATED
AUTHENTICATION FAILURE (cause = #21 "synch failure") sent AUTHENTICATION REQUEST received On first expiry, the UE should consider the network as false
T3421 15s EMM DEREGISTERED INITIATED DETACH REQUEST sent DETACH ACCEPT received Retransmission of DETACH REQUEST
T3423 NOTE 3 EMM REGISTERED T3412 expires while the UE is in EMM-REGISTERED.NO-CELLAVAILABLE
and ISR is activated.
When entering state EMM DEREGISTERED
or
when entering EMM-CONNECTED mode.
Set TIN to "P-TMSI"
T3430 15s EMM-TRACKING AREA UPDATING INITIATED TRACKING AREA UPDATE
REQUEST sent
TRACKING AREA UPDATE ACCEPT received
TRACKING AREA UPDATE REJECT received
Start T3411 or T3402 as described in subclause 5.5.3.2.6
T3440 10s EMM REGISTERED INITIATED
EMM-TRACKING AREA UPDATING INITIATED
EMM DEREGISTERED INITIATED
EMM-SERVICE REQUEST INITIATED
EMM REGISTERED
ATTACH REJECT, DETACH REQUEST, TRACKING AREA
UPDATE REJECT with any of the EMM cause #11, #12, #13, #14 or #15 SERVICE REJECT received with any of the EMM cause #11,#12, #13 or #15
TRACKING AREA UPDATE ACCEPT received after the UE
sent TRACKING AREA UPDATE REQUEST in EMMIDLE mode with no "active" flag
Signalling connection released
Bearers have been set up
Release the signalling connection and
proceed as described in subclause 5.3.1.2
T3442 NOTE 4 EMM REGISTERED SERVICE REJECT received with EMM cause #39 "CS domain temporarily not available" TRACKING AREA UPDATE REQUEST sent None
           
Note 1 The default value of this timer is used if the network does not indicate another value in an EMM signalling procedure.
Note 2 The value of this timer is provided by the network operator during the attach and tracking area updating procedures. (This Timer value is set in Attach Accept message as well).
Note 3 The value of this timer may be provided by the network in the ATTACH ACCEPT message and TRACKING AREA UPDATE ACCEPT message. The default value of this timer is identical to the value of T3412.
Note 4 The value of this timer is provided by the network operator when a service request for CS fallback is rejected by the network with EMM cause #39 "CS domain temporarily not available".
Note 5

The default value of this timer is used if the network does not indicate a value in the TRACKING AREA UPDATE ACCEPT message and the UE does not have a stored value for this timer.

(This Timer value is set in Attach Accept message as well).