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 8
NOTE 10

NOTE 2

EMM-REGISTERED

Paging procedure for EPS services initiated

Paging procedure for EPS services completed

Paging procedure is aborted

Network dependent

T3415
NOTE 8
NOTE 10

NOTE 6

EMM-REGISTERED

Paging procedure for EPS services initiated for a UE which the network accepted the request to use eDRX and the UE does not have a PDN connection for emergency bearer services

Paging procedure for EPS services completed

Paging procedure is aborted

Paging procedure is aborted and the network proceeds as specified in 3GPP TS 23.401 [10]

T3422
NOTE 7
NOTE 9

6s

In WB-S1/CE mode, 24s

EMM-DEREGISTERED-INITIATED

DETACH REQUEST sent

DETACH ACCEPT received

Retransmission of DETACH REQUEST

T3447

NOTE 2

All

UE transitions from EMM-CONNECTED mode to EMM-IDLE mode except when UE was in EMM-CONNECTED mode due to paging, attach without PDN connection or tracking area update request without "active" or "signalling active" flag set

UE transitions from 5GMM-CONNECTED mode to 5GMM-IDLE mode except when UE was in 5GMM-CONNECTED mode due to paging, REGISTRATION REQUEST for initial registration with Follow-on request indicator set to "No follow-on request pending", or REGISTRATION REQUEST for mobility and periodic registration update with Follow-on request indicator set to "No follow-on request pending" and without Uplink data status IE included.

ATTACH ACCEPT or TRACKING AREA UPDATE ACCEPT without the T3447 value IE. At MME during inter-system change from S1 mode to N1 mode.

REGISTRATION ACCEPT without the T3447 value IE (defined in 3GPP TS 24.501 [54]). CONFIGURATION UPDATE COMMAND with the T3447 value IE set to zero or deactivated (defined in 3GPP TS 24.501 [54]). At AMF during inter-system change from N1 mode to S1 mode defined in 3GPP TS 24.501 [54]).

Allow the UE to initiate a connection for transfer of uplink user data.

T3450
NOTE 7
NOTE 9

6s

In WB-S1/CE mode, 18s

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
NOTE 7
NOTE 9

6s

In WB-S1/CE mode, 24s

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
NOTE 7
NOTE 9

6s

In WB-S1 mode, 24s

EMM-COMMON-PROC-INIT

IDENTITY REQUEST sent

IDENTITY RESPONSE received

Retransmission of IDENTITY REQUEST

Mobile reachable

NOTE 4

All except EMM-DEREGISTERED

Entering EMM-IDLE mode

NAS signalling connection established

Network dependent, but typically paging is halted on 1st expiry if the UE is not attached for emergency bearer services.

 

Implicitly detach the UE which is attached for emergency bearer services.

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

active timer

NOTE 5

All except EMM-DEREGISTERED

Entering EMM-IDLE mode

NAS signalling connection established

Network dependent, but typically paging is halted 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.

NOTE 4:   The default value of this timer is 4 minutes greater than T3412. If T3346 is larger than T3412 and the MME includes timer T3346 in the TRACKING AREA UPDATE REJECT message or SERVICE REJECT message, the value of the mobile reachable timer and implicit detach timer is set such that the sum of the timer values is greater than T3346. If the UE is attached for emergency bearer services, the value of this timer is set equal to T3412.

NOTE 5:   If the MME includes timer T3324 in the ATTACH ACCEPT message or TRACKING AREA UPDATE ACCEPT message and if the UE is not attached for emergency bearer services and has no PDN connection for emergency bearer services, the value of this timer is equal to the value of timer T3324.

NOTE 6:   The value of this timer is smaller than the value of timer T3-RESPONSE (see 3GPP TS 29.274 [16D]).

NOTE 7:   In NB-S1 mode, then the timer value shall be calculated as described in subclause 4.7.

NOTE 8:   In NB-S1 mode, then the timer value shall be calculated by using an NAS timer value which is network dependent.

NOTE 9:   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 10: In WB-S1 mode, if the UE supports CE mode B, then the timer value shall be calculated by using an NAS timer value which value is network dependent.

 

 

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

One thought on “EPS Mobility Management Timers – Network side”

  1. Hello,
    My ISP uses a LTE system for rural internet service. I’m often losing my connection for several mins. and the following is what is shown in the 4G/LTE router log.
    Any suggestions at to the cause of the connection loss?

    Thanks,
    Brian

    Jun 5 19:49:56 syslog: [3G_SERIAL]: EPS Not registered detected!
    Jun 5 19:50:08 syslog: [3G_KEEPALIVE]: Issue Re-connect for network detach …
    Jun 5 19:50:08 syslog: [3GFUN]: Stop Data Connection 2
    Jun 5 19:50:10 syslog: [GB_Service]: StopDataConnection successfully mSessionID(d0634ef9) type 1
    Jun 5 19:50:10 syslog: [3GFUN]: Stop Data Connection exit
    Jun 5 19:50:10 syslog: [GB_Service]: WDSSessionStateCallback (1,0) (100117a0)
    Jun 5 19:50:10 syslog: [GB_Service]: Call End Code (2): ClientEnd
    Jun 5 19:50:10 syslog: [GB_Service]: Call Reason Type : CallManagerDefined
    Jun 5 19:50:10 syslog: [GB_Service]: WDS Call End Reason(2000) : ClientEnd
    Jun 5 19:50:10 syslog: [GB_Service]: OnSessionStateCBNotification (APN) handle(1050c150) mhGobi(1050c150)
    Jun 5 19:50:10 syslog: [GB_Service]: OnSessionStateCBNotification:: Session state Disconnected
    Jun 5 19:50:22 syslog: [3G_SERIAL]: Recovery Dialup …
    Jun 5 19:50:34 syslog: [3G_SERIAL]: Network registering ….
    Jun 5 19:51:02 syslog: [3G_SERIAL]: Network registered ….
    Jun 5 19:51:04 syslog: [3GFUN] IP Pass-through
    Jun 5 19:51:08 3G/4G: Data connection establishing …(ppp11/internet)
    Jun 5 19:51:08 syslog: [GB_Service]: APN1 SetMuxID(81)(0)
    Jun 5 19:51:09 syslog: APN(internet) profile index (1)
    Jun 5 19:51:09 syslog: [GB_Service]: StartDataSession internet successfully mSessionID(d0634ef9) mhGobi(1050c150)
    Jun 5 19:51:10 syslog: [GB_Service]: WDSSessionStateCallback (2,0) (100117a0)
    Jun 5 19:51:10 syslog: [GB_Service]: OnSessionStateCBNotification (APN) handle(1050c150) mhGobi(1050c150)
    Jun 5 19:51:10 syslog: [GB_Service]: OnSessionStateCBNotification:: Session state Connected
    Jun 5 19:51:10 syslog: [GB_Service]: network MTU(1460)
    Jun 5 19:51:10 syslog: [QMI]: Start Data session successfully
    Jun 5 19:51:16 3G/4G: IPv4 addressing …(ppp11)
    Jun 5 19:51:16 DHCP Client[30508]: DHCP Client (v0.9.9-pre) started
    Jun 5 19:51:16 DHCP Client[30508]: Sending discover…
    Jun 5 19:51:16 DHCP Client[30508]: Sending select for 69.10.175.63…
    Jun 5 19:51:16 DHCP Client[30508]: Lease of 69.10.175.63 obtained, lease time -1 (ppp11 /1)
    Jun 5 19:51:16 3G/4G: NDIS interface=ppp11
    Jun 5 19:51:16 3G/4G: NDIS ppp11 Dial Success
    Jun 5 19:51:21 syslog: [3GFUN]: Remove DHCP client …
    Jun 5 19:51:22 syslog: [3GFUN]: DHCP server Set IP 69.10.175.63 GW 69.10.175.64 done
    Jun 5 19:51:22 udhcpd[30888]: udhcpd (v0.9.9-pre) started
    Jun 5 19:51:25 DNS[31372]: using nameserver 8.8.4.4#53(via ppp11)
    Jun 5 19:51:25 DNS[31372]: using nameserver 8.8.8.8#53(via ppp11)
    Jun 5 19:51:25 DNS[31372]: using nameserver 8.8.4.4#53(via ppp11)
    Jun 5 19:51:25 DNS[31372]: using nameserver 8.8.8.8#53(via ppp11)
    Jun 5 19:51:43 syslog: [3G_SERIAL]: EPS Not registered detected!
    Jun 5 19:51:45 udhcpd[30892]: Re-init host(Lease number 1).
    Jun 5 19:51:49 syslog: [3G_KEEPALIVE]: Issue Re-connect for network detach …
    Jun 5 19:51:49 syslog: [3GFUN]: Stop Data Connection 2
    Jun 5 19:51:49 syslog: [GB_Service]: StopDataConnection successfully mSessionID(d0634ef9) type 1
    Jun 5 19:51:49 syslog: [GB_Service]: WDSSessionStateCallback (1,0) (100117a0)
    Jun 5 19:51:49 syslog: [GB_Service]: Call End Code (2): ClientEnd
    Jun 5 19:51:49 syslog: [GB_Service]: Call Reason Type : CallManagerDefined
    Jun 5 19:51:49 syslog: [GB_Service]: WDS Call End Reason(2000) : ClientEnd
    Jun 5 19:51:49 syslog: [GB_Service]: OnSessionStateCBNotification (APN) handle(1050c150) mhGobi(1050c150)
    Jun 5 19:51:49 syslog: [GB_Service]: OnSessionStateCBNotification:: Session state Disconnected
    Jun 5 19:51:51 syslog: [3GFUN]: Stop Data Connection exit
    Jun 5 19:52:03 syslog: [3G_SERIAL]: Recovery Dialup …
    Jun 5 19:52:15 syslog: [3G_SERIAL]: Network registering ….
    Jun 5 19:52:39 syslog: [3G_SERIAL]: Network registered ….
    Jun 5 19:52:42 syslog: [3GFUN] IP Pass-through
    Jun 5 19:52:45 3G/4G: Data connection establishing …(ppp11/internet)
    Jun 5 19:52:47 syslog: [GB_Service]: APN1 SetMuxID(81)(0)
    Jun 5 19:52:48 syslog: APN(internet) profile index (1)
    Jun 5 19:52:48 syslog: [GB_Service]: StartDataSession internet successfully mSessionID(d0634ef9) mhGobi(1050c150)
    Jun 5 19:52:48 syslog: [GB_Service]: WDSSessionStateCallback (2,0) (100117a0)
    Jun 5 19:52:48 syslog: [GB_Service]: OnSessionStateCBNotification (APN) handle(1050c150) mhGobi(1050c150)
    Jun 5 19:52:48 syslog: [GB_Service]: OnSessionStateCBNotification:: Session state Connected
    Jun 5 19:52:48 syslog: [GB_Service]: network MTU(1460)
    Jun 5 19:52:48 syslog: [QMI]: Start Data session successfully
    Jun 5 19:52:53 3G/4G: IPv4 addressing …(ppp11)
    Jun 5 19:52:53 DHCP Client[32246]: DHCP Client (v0.9.9-pre) started
    Jun 5 19:52:54 DHCP Client[32246]: Sending discover…
    Jun 5 19:52:54 DHCP Client[32246]: Sending select for 69.10.175.63…
    Jun 5 19:52:54 DHCP Client[32246]: Lease of 69.10.175.63 obtained, lease time -1 (ppp11 /1)
    Jun 5 19:52:54 3G/4G: NDIS interface=ppp11
    Jun 5 19:52:54 3G/4G: NDIS ppp11 Dial Success
    Jun 5 19:52:59 syslog: [3GFUN]: Remove DHCP client …
    Jun 5 19:53:00 syslog: [3GFUN]: DHCP server Set IP 69.10.175.63 GW 69.10.175.64 done
    Jun 5 19:53:00 udhcpd[32701]: udhcpd (v0.9.9-pre) started
    Jun 5 19:53:03 DNS[725]: using nameserver 8.8.4.4#53(via ppp11)
    Jun 5 19:53:03 DNS[725]: using nameserver 8.8.8.8#53(via ppp11)
    Jun 5 19:53:03 DNS[725]: using nameserver 8.8.4.4#53(via ppp11)
    Jun 5 19:53:03 DNS[725]: using nameserver 8.8.8.8#53(via ppp11)
    Jun 5 19:53:23 udhcpd[32707]: Re-init host(Lease number 1).

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