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Sep 30, 2013

LTE EPS Session Management timers - ESM timers

Previously I've shared the EMM timers, today it's a EPS Session Management

Table 1. 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
8s
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
8s
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
8s
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
6s
PROCEDURE TRANSACTION PENDING
PDN DISCONNECT REQUEST sent
DEACTIVATE EPS BEARER CONTEXT REQUEST received or PDN DISCONNECT REJECT received
Retransmission of PDN DISCONNECT REQUEST
NOTE 1: Typically, the procedures are aborted on the fifth expiry of the relevant timer. Exceptions are described in the corresponding procedure description.

Table 2. EPS session management timers – network side

TIMER NUM.
TIMER VALUE
STATE
CAUSE OF START
NORMAL STOP
ON THE
1st, 2nd, 3rd, 4th EXPIRY (NOTE 1)
T3485
8s
BEARER CONTEXT ACTIVE PENDING
ACTIVATE DEFAULT EPS BEARER CONTEXT REQUEST sent

ACTIVATE DEDICATED EPS BEARER CONTEXT REQUEST sent
ACTIVATE DEFAULT EPS BEARER CONTEXT ACCEPT received
or ACTIVATE DEFAULT EPS BEARER CONTEXT REJECT received
or ACTIVATE DEDICATED EPS BEARER CONTEXT ACCEPT received
or ACTIVATE DEDICATED EPS BEARER CONTEXT REJECT received
Retransmission of the same message
T3486
8s
BEARER CONTEXT MODIFY PENDING
MODIFY EPS BEARER CONTEXT REQUEST sent
MODIFY EPS BEARER CONTEXT ACCEPT received
or MODIFY EPS BEARER CONTEXT REJECT received
Retransmission of MODIFY EPS BEARER CONTEXT REQUEST
T3489
4s
PROCEDURE TRANSACTION PENDING
ESM INFORMATION REQUEST sent
ESM INFORMATION RESPONSE received

Retransmission of ESM INFORMATION REQUEST on 1st and 2nd expiry only
T3495
8s
BEARER CONTEXT INACTIVE PENDING
DEACTIVATE EPS BEARER CONTEXT REQUEST sent
DEACTIVATE EPS BEARER CONTEXT ACCEPT received
Retransmission of DEACTIVATE EPS BEARER CONTEXT REQUEST
NOTE 1: Typically, the procedures are aborted on the fifth expiry of the relevant timer. Exceptions are described in the corresponding procedure description.


Source:
TS 24.301 3GPP