Timer (EPS Mobile Management - NW Side)
Following table comes from 24.301 - 10.2 Timers of EPS mobility management (Table 10.2.2: EPS mobility management timers – Network side)
| TIMER NUM. |
TIMER VALUE |
STATE | CAUSE OF START | NORMAL STOP | ON THE 1st, 2nd, 3rd, 4th EXPIRY (NOTE 1) |
| T3413 | NOTE 2 | EMM REGISTERED | Paging procedure for EPS services initiated | Paging procedure for EPS services completed | Network dependent |
| T3422 | 6s | EMM DEREGISTERED INITIATED | DETACH REQUEST sent | DETACH ACCEPT received | Retransmission of DETACH REQUEST |
| T3450 | 6s | EMM-COMMON PROC-INIT | ATTACH ACCEPT sent TRACKING AREA UPDATE ACCEPT sent with GUTI TRACKING AREA UPDATE ACCEPT sent with TMSI GUTI REALLOCATION COMMAND sent |
ATTACH COMPLETE
received TRACKING AREA UPDATE COMPLETE received GUTI REALLOCATION COMPLETE received |
Retransmission of the same message type, i.e. ATTACH ACCEPT,TRACKING AREA UPDATE ACCEPT or GUTI REALLOCATION COMMAND |
| T3460 | 6s | EMM-COMMON PROC-INIT | AUTHENTICATION
REQUEST sent SECURITY MODE COMMAND sent |
AUTHENTICATION
RESPONSE received AUTHENTICATION FAILURE received SECURITY MODE COMPLETE received SECURITY MODE REJECT received |
Retransmission of the same message type, i.e.AUTHENTICATION REQUEST or SECURITY MODE COMMAND |
| T3470 | 6s | EMM-COMMON PROC-INIT | IDENTITY REQUEST sent | IDENTITY RESPONSE received | Retransmission of IDENTITY REQUEST |
| Mobile reachable |
Default 4 min greater than T3412 | All except EMM DEREGISTERED | Entering EMM-IDLE mode | NAS signalling connection established | Network dependent, but typically paging is halted on 1st expiry |
| Implicit detach timer |
NOTE 3 | All except EMM DEREGISTERED | The
mobile reachable timer expires while the network is in EMM-IDLE mode |
NAS signalling connection established | Implicitly detach the UE on 1st expiry |
| 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: | The value of this timer is network dependent. | ||||
| NOTE 3: | The value of this timer is network dependent. If ISR is activated, the default value of this timer is 4 minutes greater than T3423. | ||||