EPS session management timers – UE side

 

TIMER NUM.

TIMER VALUE

STATE

CAUSE OF START

NORMAL STOP

ON THE
1st, 2nd, 3rd, 4th EXPIRY (NOTE 1)

T3480
NOTE 2
NOTE 3

8s

In WB-S1/CE mode, 16s

PROCEDURE TRANSACTION PENDING

BEARER RESOURCE ALLOCATION REQUEST sent

 

ACTIVATE DEDICATED EPS BEARER CONTEXT REQUEST received or MODIFY EPS BEARER CONTEXT REQUEST received or BEARER RESOURCE ALLOCATION REJECT received

Retransmission of BEARER RESOURCE ALLOCATION REQUEST

 

 

T3481
NOTE 2
NOTE 3

8s

In WB-S1/CE mode, 16s

PROCEDURE TRANSACTION PENDING

BEARER RESOURCE MODIFICATION REQUEST sent

ACTIVATE DEDICATED EPS BEARER CONTEXT REQUEST received or MODIFY EPS BEARER CONTEXT REQUEST received or DEACTIVATE EPS BEARER CONTEXT REQUEST received or BEARER RESOURCE MODIFICATION REJECT received

Retransmission of BEARER RESOURCE MODIFICATION REQUEST

T3482
NOTE 2
NOTE 3

8s

In WB-S1/CE mode, 16s

PROCEDURE TRANSACTION PENDING

An additional PDN connection is requested by the UE which is not combined in attach procedure

ACTIVE DEFAULT EPS BEARER CONTEXT REQUEST received or PDN CONNECTIVITY REJECT received

Retransmission of PDN CONNECTIVITY REQUEST

T3492
NOTE 2
NOTE 3

6s

In WB-S1/CE mode, 14s

PROCEDURE TRANSACTION PENDING

PDN DISCONNECT REQUEST sent

DEACTIVATE EPS BEARER CONTEXT REQUEST received or PDN DISCONNECT REJECT received

Retransmission of PDN DISCONNECT REQUEST

T3493
NOTE 2

4s

In WB-S1/CE mode, 12s

PROCEDURE TRANSACTION PENDING

REMOTE UE REPORT sent

REMOTE UE REPORT RESPONSE received

Retransmission of REMOTE UE REPORT

Back-off timer

 

 

defined in 3GPP TS 24.008 [13]

 

 

NOTE 1: Typically, the procedures are aborted on the fifth expiry of the relevant timer. Exceptions are described in the corresponding procedure description.

NOTE 2: In NB-S1 mode, then the timer value shall be calculated as described in subclause 4.7.

NOTE 3: In WB-S1 mode, if the UE supports CE mode B and operates in either CE mode A or CE mode B, then the timer value is as described in this table for the case of WB-S1/CE mode (see subclause 4.8).

 

NOTE 1: The back-off timer is used to describe a logical model of the required UE behaviour. This model does not imply any specific implementation, e.g. as a timer or timestamp.

NOTE 2: Reference to back-off timer in this section can either refer to use of timer T3396 or to use of a different packet system specific timer within the UE. Whether the UE uses T3396 as a back-off timer or it uses different packet system specific timers as back-off timers is left up to UE implementation.

Source: 3GPP 24.301, for latest update please visit 3GPP official file location 

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