10 List of system parameters

24.5013GPPNon-Access-Stratum (NAS) protocol for 5G System (5GS)Release 18Stage 3TS

10.1 General

The description of timers in the following tables should be considered a brief summary. The precise details are found in clauses 4 to 6, which should be considered the definitive descriptions.

10.2 Timers of 5GS mobility management

Timers of 5GS mobility management are shown in table 10.2.1 and table 10.2.2.

NOTE: Timers T3324, T3346, T3245 and T3247 are defined in 3GPP TS 24.008 [12]. Timers T3444, T3445, T3447 and T3448 are defined in 3GPP TS 24.301 [15].

Table 10.2.1: Timers of 5GS mobility management – UE side

TIMER NUM.

TIMER VALUE

STATE

CAUSE OF START

NORMAL STOP

ON
EXPIRY

T3502

Default 12 min.

NOTE 1

5GMM-DEREGISTERED 5GMM-REGISTERED

At registration failure and the attempt counter is equal to 5

Transmission of REGISTRATION REQUEST message

Initiation of the registration procedure, if still required

T3510

15s

NOTE 7

NOTE 8

In WB-N1/CE mode, 85s

For access via a satellite NG-RAN cell, 27s

NOTE 12

5GMM-REGISTERED-INITIATED

Transmission of REGISTRATION REQUEST message

REGISTRATION ACCEPT message received or REGISTRATION REJECT message received

Start T3511 or T3502 as specified in subclause 5.5.1.2.7 if T3510 expired during registration procedure for initial registration.

Start T3511 or T3502 as specified in subclause 5.5.1.3.7 if T3510 expired during the registration procedure for mobility and periodic registration update

T3511

10s

5GMM-DEREGISTERED.ATTEMPTING-REGISTRATION

5GMM-REGISTERED.ATTEMPTING-REGISTRATION-UPDATE

5GMM-REGISTERED.NORMAL-SERVICE or 5GMM-REGISTERED.NON-ALLOWED-SERVICE

At registration failure due to lower layer failure, T3510 timeout or registration rejected with other 5GMM cause values than those treated in subclause 5.5.1.2.5 for initial registration or subclause 5.5.1.3.5 for mobility and periodic registration

Transmission of REGISTRATION REQUEST message

5GMM-CONNECTED mode entered (NOTE 5)

Retransmission of the REGISTRATION REQUEST message, if still required

T3512

Default 54 min

NOTE 1

NOTE 2

5GMM-REGISTERED

In 5GMM-REGISTERED, when 5GMM-CONNECTED mode is left and if the NW does not indicate support for strictly periodic registration timer as specified in subclause 5.3.7.

If the network indicates support for strictly periodic registration timer, T3512 is started after the successful completion of registration update procedure. T3512 is restarted if it expires in 5GMM-CONNECTED mode as specified in subclause 5.3.7.

When entering state 5GMM-DEREGISTERED

When entering 5GMM-CONNECTED mode if the NW does not indicate support for strictly periodic registration timer as specified in subclause 5.3.7.

In 5GMM-IDLE mode, Initiation of the periodic registration procedure if the UE is not registered for emergency services.

In 5GMM-CONNECTED mode, restart the timer T3512.

Locally deregister if the UE is registered for emergency services

T3516

30s

NOTE 7

NOTE 8

In WB-N1/CE mode, 48s For access via a satellite NG-RAN cell, 35s

NOTE 12

5GMM-REGISTERED-INITIATED

5GMM-REGISTERED

5GMM-DEREGISTERED-INITIATED

5GMM-SERVICE-REQUEST-INITIATED

RAND and RES* stored as a result of an 5G authentication challenge

SECURITY MODE COMMAND message received

SERVICE REJECT message received

REGISTRATION ACCEPT message received

AUTHENTICATION REJECT message received

AUTHENTICATION FAILURE message sent

5GMM-DEREGISTERED, 5GMM-NULL or

5GMM-IDLE mode entered

Delete the stored RAND and RES*

T3517

(a) 5s for case h) in subclause 5.6.1.1; or

(b) 15s for cases other than h) in subclause 5.6.1.1

NOTE 7

NOTE 8

NOTE 10

In WB-N1/CE mode, 61s For access via a satellite NG-RAN cell, 27s

NOTE 12

5GMM-SERVICE-REQUEST-INITIATED

Transmission of SERVICE REQUEST message, or CONTROL PLANE SERVICE REQUEST message

(a) Indication from the lower layers that the UE has changed to S1 mode or E-UTRA connected to 5GCN for case h) in subclause 5.6.1.1; or

(b) SERVICE ACCEPT message received, or

SERVICE REJECT message received for cases other than h) in subclause 5.6.1.1

see subclause 5.6.1.4.2

Abort the procedure

T3519

60s

NOTE 7

NOTE 8

In WB-N1/CE mode, 90s For access via a satellite NG-RAN cell, 65s

5GMM-REGISTERED-INITIATED

5GMM-REGISTERED

5GMM-DEREGISTERED-INITIATED

5GMM-SERVICE-REQUEST-INITIATED (NOTE 6)

Transmission of IDENTITY RESPONSE message, REGISTRATION REQUEST message, or DEREGISTRATION REQUEST message with freshly generated SUCI

REGISTRATION ACCEPT message with new 5G-GUTI received

CONFIGURATION UPDATE COMMAND message with new 5G-GUTI received DEREGISTRATION ACCEPT message

Delete stored SUCI

T3520

15s

NOTE 7

NOTE 8

In WB-N1/CE mode, 33s For access via a satellite NG-RAN cell, 20s

NOTE 12

5GMM-REGISTERED-INITIATED

5GMM-REGISTERED

5GMM-DEREGISTERED-INITIATED

5GMM-SERVICE-REQUEST-INITIATED

Transmission of AUTHENTICATION FAILURE message with any of the 5GMM cause #20, #21, #26 or #71

Transmission of AUTHENTICATION RESPONSE message with an EAP-response message after detection of an error as described in subclause 5.4.1.2.2.4

AUTHENTICATION REQUEST message received or AUTHENTICATION REJECT message received

or

SECURITY MODE COMMAND message received

when entering 5GMM-IDLE mode

indication of transmission failure of AUTHENTICATION FAILURE message from lower layers

On first expiry during a 5G AKA based primary authentication and key agreement procedure, the UE should consider the network as false and follow item g of subclause 5.4.1.3.7, if the UE is not registered for emergency services.

On first expiry during a 5G AKA based primary authentication and key agreement procedure, the UE will follow subclause 5.4.1.3.7 under "For items c, d, e and f:", if the UE is registered for emergency services.

On first expiry during an EAP based primary authentication and key agreement procedure, the UE should consider the network as false and follow item e of subclause 5.4.1.2.4.5, if the UE is not registered for emergency services.

On first expiry during an EAP based primary authentication and key agreement procedure, the UE will follow subclause 5.4.1.2.4.5 under "For item e:", if the UE is registered for emergency services

T3521

15s

NOTE 7

NOTE 8

In WB-N1/CE mode, 45s For access via a satellite NG-RAN cell, 27s

NOTE 12

5GMM-DEREGISTERED-INITIATED

Transmission of DEREGISTRATION REQUEST message when de-registration procedure is not due to a "switch off"

DEREGISTRATION ACCEPT message received

Retransmission of DEREGISTRATION REQUEST message

T3525

Default 60s

NOTE 3

NOTE 7

NOTE 8

In WB-N1/CE mode, default 120s

For access via a satellite NG-RAN cell, default 72s

NOTE 12

5GMM-REGISTERED.NORMAL-SERVICE or 5GMM-REGISTERED.NON-ALLOWED-SERVICE

T3517 expires and service request attempt counter is greater than or equal to 5

When entering state other than 5GMM-REGISTERED.NORMAL-SERVICE state or 5GMM-REGISTERED.NON-ALLOWED-SERVICE,

or

UE camped on a new PLMN other than the PLMN on which timer started,

or

User-plane resources established with the network

The UE may initiate service request procedure

T3540

10s

NOTE 7 (applicable to case f) in subclause 5.3.1.3)

NOTE 8

In WB-N1/CE mode, 34s (applicable to case f) in subclause 5.3.1.3)

NOTE 11

For access via a satellite NG-RAN cell, default 22s (applicable to case f) in subclause 5.3.1.3)

NOTE 12

5GMM-DEREGISTERED

5GMM-REGISTERED

REGISTRATION REJECT message or DEREGISTRATION REQUEST message received with any of the 5GMM cause #3, #6, #7, #11, #12, #13, #15, #27, #31, #62, #72, #73, #74, #75 or #76

SERVICE REJECT message received with any of the 5GMM cause #3, #6, #7, #11, #12, #13, #15, #27, #72, #73, #74, #75 or #76.

REGISTRATION ACCEPT message received as described in subclause 5.3.1.3 case b) and case h)

SERVICE ACCEPT message received as described in subclause 5.3.1.3 case f)

AUTHENTICATION REJECT message received

DEREGISTRATION ACCEPT message received as described in subclause 5.3.1.3 case k)

N1 NAS signalling connection released

PDU sessions have been set up except for the case the UE has set Request type to "NAS signalling connection release" in the UE request type IE in the REGISTRATION REQUEST message as described in subclause 5.3.1.3 case b)

Other use cases see subclause 5.3.1.3

Release the NAS signalling connection for the cases a), b), f) and g) as described in subclause 5.3.1.3

5GMM-REGISTERED

CONFIGURATION UPDATE COMMAND message received as described in subclause 5.3.1.3 case e) and h)

SERVICE ACCEPT message received as described in subclause 5.3.1.3 case i)

N1 NAS signalling connection released Other use cases see subclause 5.3.1.3

Release the NAS signalling connection for the case e) and perform a new registration procedure as described in subclause 5.5.1.3.2

Release the NAS signalling connection for the case h) and i) as described in subclause 5.3.1.3

5GMM-DEREGISTERED

5GMM-DEREGISTERED.NORMAL-SERVICE

5GMM-REGISTERED.NON-ALLOWED-SERVICE

REGISTRATION REJECT message received with the 5GMM cause #9 or #10

SERVICE REJECT message received with the 5GMM cause #9, #10 or #28

Release the NAS signalling connection for the cases c) and d) as described in subclause 5.3.1.3 and initiation of the registration procedure as specified in subclause 5.5.1.2.2 or 5.5.1.3.2

Non-3GPP de-registration timer

Default 54 min.

NOTE 1

NOTE 2

NOTE 4

All 5GMM state over non-3GPP access except 5GMM-DEREGISTERED over non-3GPP access

Entering 5GMM-IDLE mode over non-3GPP access

N1 NAS signalling connection over non-3GPP access established or when entering state 5GMM-DEREGISTERED over non-3GPP access

Implicitly de-register the UE for non-3GPP access on 1st expiry

T3526

NOTE 9

5GMM-DEREGISTERED 5GMM-REGISTERED

Rejected S-NSSAI with rejection cause "S-NSSAI not available due to maximum number of UEs reached" received.

Associated S-NSSAI in the rejected NSSAI for the maximum number of UEs reached as specified in subclause 4.6.2.2 deleted.

Remove the S-NSSAI in the rejected NSSAI for the maximum number of UEs reached associated with the T3526 timer.

T3527

15s

5GMM-REGISTERED.NORMAL-SERVICE

Transmission of RELAY KEY REQUEST message

Transmission of RELAY AUTHENTICATION RESPONSE message

RELAY KEY REJECT message received or

RELAY AUTHENTICATION REQUEST message received or

RELAY KEY ACCEPT message received

Retransmission of RELAY KEY REQUEST message

NOTE 1: The value of this timer is provided by the network operator during the registration procedure.

NOTE 2: The default value of this timer is used if the network does not indicate a value in the REGISTRATION ACCEPT message and the UE does not have a stored value for this timer.

NOTE 3: The value of this timer is UE implementation specific, with a minimum value of 60 seconds if not in NB-N1 mode and if not in WB-N1/CE mode.

NOTE 4: If the T3346 value received in the mobility management messages is greater than the value of the non-3GPP de-registration timer, the UE sets the non-3GPP de-registration timer value to be 4 minutes greater than the value of timer T3346.

NOTE 5: The conditions for which this applies are described in subclause 5.5.1.3.7.

NOTE 6: The conditions for which this applies to the 5GMM-SERVICE-REQUEST-INITIATED state are described in subclause 5.4.1.3.7 case c) and case d).

NOTE 7: In NB-N1 mode, the timer value shall be calculated as described in subclause 4.17.

NOTE 8: In WB-N1 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-N1/CE mode (see subclause 4.19).

NOTE 9: The value of this timer is provided by the network operator during the registration procedure or the generic UE configuration update procedure along with the rejected S-NSSAI with rejection cause "S-NSSAI not available due to maximum number of UEs reached". The default value of this timer is implementation specific with a minimum value of 12 minutes and used if the network does not provide a value in the REGISTRATION ACCEPT message, the REGISTRATION REJECT message, or the CONFIGURATION UPDATE COMMAND message along with the rejected S-NSSAI with rejection cause "S-NSSAI not available due to maximum number of UEs reached".

NOTE 10: Based on implementation, the timer may be set to a value between 250ms and 15s when the MUSIM UE indicates "NAS signalling connection release" in the UE request type IE of the SERVICE REQUEST message or CONTROL PLANE SERVICE REQUEST message.

NOTE 11: Based on implementation, the timer may be set to a value between 250ms and 10s when the MUSIM UE not in NB-N1 mode or WB-N1 mode indicated "NAS signalling connection release" or "Rejection of paging" in the UE request type IE of the SERVICE REQUEST message or CONTROL PLANE SERVICE REQUEST message; or indicated "NAS signalling connection release" in the UE request type IE of the REGISTRATION REQUEST message.

NOTE 12: In satellite NG-RAN access, this value shall be selected when satellite NG-RAN RAT type is NR(MEO) or NR(GEO).

Table 10.2.2: Timers of 5GS mobility management – AMF side

TIMER NUM.

TIMER VALUE

STATE

CAUSE OF START

NORMAL STOP

ON
EXPIRY

T3513

NOTE 7

NOTE 9

NOTE 4

5GMM-REGISTERED

Paging procedure initiated

Paging procedure completed as specified in subclause 5.6.2.2.1

Network dependent

T3522

NOTE 6

NOTE 8

6s

In WB-N1/CE mode, 24s

For access via a satellite NG-RAN cell, 11s

NOTE 12

5GMM-DEREGISTERED-INITIATED

Transmission of DEREGISTRATION REQUEST message

DEREGISTRATION ACCEPT message received

Retransmission of DEREGISTRATION REQUEST message

T3550

NOTE 6

NOTE 8

6s

In WB-N1/CE mode, 18s

For access via a satellite NG-RAN cell, 11s

NOTE 12

5GMM-COMMON-PROCEDURE-INITIATED

Transmission of REGISTRATION ACCEPT message as specified in subclause 5.5.1.2.4 and 5.5.1.3.4

REGISTRATION COMPLETE message received

Retransmission of REGISTRATION ACCEPT message

T3555

NOTE 6

NOTE 8

6s

In WB-N1/CE mode, 24s

For access via a satellite NG-RAN cell, 11s

NOTE 12

5GMM-REGISTERED

Transmission of CONFIGURATION UPDATE COMMAND message with "acknowledgement requested" set in the Acknowledgement bit of the Configuration update indication IE

CONFIGURATION UPDATE COMPLETE message received

Retransmission of CONFIGURATION UPDATE COMMAND message

T3560

NOTE 6

NOTE 8

6s

In WB-N1/CE mode, 24s

For access via a satellite NG-RAN cell, 11s

5GMM-COMMON-PROCEDURE-INITIATED

Transmission of AUTHENTICATION REQUEST message

Transmission of SECURITY MODE COMMAND message

AUTHENTICATION RESPONSE message received

AUTHENTICATION FAILURE message received

SECURITY MODE COMPLETE message received

SECURITY MODE REJECT message received

Retransmission of AUTHENTICATION REQUEST message or SECURITY MODE COMMAND message

T3565

NOTE 6

NOTE 8

6s

In WB-N1/CE mode, 24s For access via a satellite NG-RAN cell, 11s

NOTE 12

5GMM-REGISTERED

Transmission of NOTIFICATION message

SERVICE REQUEST message received

CONTROL PLANE SERVICE REQUEST message received

NOTIFICATION RESPONSE message received

REGISTRATION REQUEST

Message received

DEREGISTRATION REQUEST message received

NGAP UE context resume request message as specified in 3GPP TS 38.413 [31] received

Retransmission of NOTIFICATION message

T3570

NOTE 6

NOTE 8

6s

In WB-N1/CE mode, 24s

For access via a satellite NG-RAN cell, 11s

NOTE 12

5GMM-COMMON-PROCEDURE-INITIATED

Transmission of IDENTITY REQUEST message

IDENTITY RESPONSE message received

Retransmission of IDENTITY REQUEST message

T3575

NOTE 6

NOTE 8

15s

In WB-N1/CE mode, 60s

For access via a satellite NG-RAN cell, 27s

NOTE 12

5GMM-REGISTERED

Transmission of NETWORK SLICE-SPECIFIC AUTHENTICATION COMMAND message

NETWORK SLICE-SPECIFIC AUTHENTICATION COMPLETE message received

Retransmission of NETWORK SLICE-SPECIFIC AUTHENTICATION COMMAND message

Active timer

NOTE 10

All except 5GMM-DEREGISTERED

Entering 5GMM-IDLE mode after indicating MICO mode activation to the UE with an active timer value.

N1 NAS signalling

connection established

Activate MICO mode for the UE.

Implicit de-registration timer

NOTE 2

All except 5GMM-DEREGISTERED

The mobile reachable timer expires while the network is in 5GMM-IDLE mode

Entering 5GMM-IDLE mode over 3GPP access if the MICO mode is activated and strictly periodic monitoring timer is not running

The strictly periodic monitoring timer expires while the network is in 5GMM-IDLE mode

N1 NAS signalling connection established

Implicitly de-register the UE on 1st expiry

Mobile reachable timer

NOTE 1

All except 5GMM-DEREGISTERED

Entering 5GMM-IDLE mode

N1 NAS signalling connection established

Network dependent, but typically paging is halted on 1st expiry, and start implicit de-registration timer, if the UE is not registered for emergency services.

Implicitly de-register the UE which is registered for emergency services

Non-3GPP implicit de-registration timer

NOTE 3

All except 5GMM-DEREGISTERED

Entering 5GMM-IDLE mode over non-3GPP access

N1 NAS signalling connection over non-3GPP access established

Implicitly de-register the UE for non-3GPP access on 1s expiry

Strictly periodic monitoring timer

NOTE 5

All except 5GMM-DEREGISTERED

At the successful completion of registration update procedure if strictly periodic registration timer indication is supported as specified in subclause 5.3.7.

Entering 5GMM-DEREGISTERED.

In 5GMM-IDLE mode, start implicit de-registration timer as specified in subclause 5.3.7.

In 5GMM-CONNECTED mode, Strictly periodic monitoring timer is started again as specified in subclause 5.3.7.

Implementation specific timer for onboarding services

NOTE 11

5GMM-REGISTERED

At the successful completion of initial registration for onboarding services in SNPN or initial registration for the UE which the subscription is only for configuration of SNPN subscription parameters in PLMN via the user plane or successful completion of registration procedure for mobility and periodic registration update if the implementation specific timer for onboarding services is not running and:

– the UE is registered for onboarding services in SNPN; or

– the UE’s subscription only allows for configuration of SNPN subscription parameters in PLMN via the user plane.

DEREGISTRATION REQUEST message received.

Network-initiated de-registration procedure performed

NOTE 1: The default value of this timer is 4 minutes greater than the value of timer T3512. If the UE is registered for emergency services, the value of this timer is set equal to the value of timer T3512. If the T3346 value provided in the mobility management messages is greater than the value of the timer T3512, the AMF sets the mobile reachable timer and the implicit de-registration timer such that the sum of the timer values is greater than the value of timer T3346.

NOTE 2: The value of this timer is network dependent. If MICO is activated, the default value of this timer is 4 minutes greater than the value of timer T3512.

NOTE 3: The value of this timer is network dependent. The default value of this timer is 4 minutes greater than the non-3GPP de-registration timer. If the T3346 value provided in the mobility management messages is greater than the value of the non-3GPP de-registration timer, the AMF sets the non-3GPP implicit de-registration timer value to be 8 minutes greater than the value of timer T3346.

NOTE 4: The value of this timer is network dependent.

NOTE 5: The value of this timer is the same as the value of timer T3512.

NOTE 6: In NB-N1 mode, the timer value shall be calculated as described in subclause 4.17.

NOTE 7: In NB-N1 mode, the timer value shall be calculated by using an NAS timer value which is network dependent.

NOTE 8: In WB-N1 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-N1/CE mode (see subclause 4.19).

NOTE 9: In WB-N1 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.

NOTE 10: If the AMF includes timer T3324 in the REGISTRATION ACCEPT message and if the UE is not registered for emergency services, the value of this timer is equal to the value of timer T3324.

NOTE 11: The value of this timer needs to be large enough to allow a UE to complete the configuration of one or more entries of the "list of subscriber data" and considering that configuration of SNPN subscription parameters in PLMN via the user plane or onboarding services in SNPN involves third party entities outside of the operator’s network.

NOTE 12: In satellite NG-RAN access, this value shall be selected when satellite NG-RAN RAT type is NR(MEO) or NR(GEO).

10.3 Timers of 5GS session management

Timers of 5GS session management are shown in table 10.3.1 and table 10.3.2.

NOTE: Timer T3396 is defined in 3GPP TS 24.008 [12].

Table 10.3.1: Timers of 5GS session management – UE side

TIMER NUM.

TIMER VALUE

STATE

CAUSE OF START

NORMAL STOP

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

T3580

NOTE 4

NOTE 5

16s

In WB-N1/CE mode, 24s

For access via a satellite NG-RAN cell, 21s

NOTE 7

PDU SESSION ACTIVE PENDING

Transmission of PDU SESSION ESTABLISHMENT REQUEST message

PDU SESSION ESTABLISHMENT ACCEPT message received or

PDU SESSION ESTABLISHMENT REJECT message received or

PDU SESSION ESTABLISHMENT REQUEST message received in a DL NAS TRANSPORT message with 5GMM cause #22, #28, #65. #67, #69, #90, #91 or #92

Retransmission of PDU SESSION ESTABLISHMENT REQUEST message

T3581

NOTE 4

NOTE 5

16s

In WB-N1/CE mode, 24s

For access via a satellite NG-RAN cell, 21s

NOTE 7

PDU SESSION MODIFICATION PENDING

Transmission of PDU SESSION MODIFICATION REQUEST message

PDU SESSION MODIFICATION COMMAND message with the same PTI is received or PDU SESSION MODIFICATION REJECT message received or

PDU SESSION MODIFICATION REQUEST message received in a DL NAS TRANSPORT message with 5GMM cause #22, #28. #67, #69, or #90

Retransmission of PDU SESSION MODIFICATION REQUEST message

T3582

NOTE 4

NOTE 5

16s

In WB-N1/CE mode, 24s

For access via a satellite NG-RAN cell, 21s

NOTE 7

PDU SESSION INACTIVE PENDING

Transmission of PDU SESSION RELEASE REQUEST message

PDU SESSION RELEASE COMMAND message with the same PTI is received or PDU SESSION RELEASE REJECT message received

Retransmission of PDU SESSION RELEASE REQUEST message

T3583

Default 1 min.

NOTE 2

PDU SESSION ACTIVE

UE creates or updates a derived QoS rule

UE deletes the derived QoS rule (see subclause 6.2.5.1.4.5)

On 1st expiry: Deletion of the derived QoS rule

T3584

NOTE 3

PDU SESSION ACTIVE PENDING

PDU SESSION MODIFICATION PENDING

PDU SESSION ACTIVE or PDU SESSION INACTIVE PENDING

PDU SESSION ESTABLISHMENT REJECT, PDU SESSION MODIFICATION REJECT, or PDU SESSION RELEASE COMMAND received with 5GSM cause #67 and with a timer value for T3584

PDU SESSION ESTABLISHMENT REQUEST, or PDU SESSION MODIFICATION REQUEST received in a DL NAS TRANSPORT message with 5GMM cause #67 and with a timer value for T3584 (see subclause 5.4.5.3.3)

PDU SESSION RELEASE COMMAND message (see NOTE 6) or PDU SESSION MODIFICATION COMMAND message or PDU SESSION AUTHENTICATION COMMAND message or DEREGISTRATION REQUEST message with the re-registration type "re-registration required"

None

T3585

NOTE 3

PDU SESSION ACTIVE PENDING

PDU SESSION MODIFICATION PENDING

PDU SESSION ACTIVE or PDU SESSION INACTIVE PENDING

PDU SESSION ESTABLISHMENT REJECT, PDU SESSION MODIFICATION REJECT, or PDU SESSION RELEASE COMMAND received with 5GSM cause #69 and with a timer value for T3585

PDU SESSION ESTABLISHMENT REQUEST, or PDU SESSION MODIFICATION REQUEST received in a DL NAS TRANSPORT message with 5GMM cause #69 and with a timer value for T3585(see subclause 5.4.5.3.3)

DU SESSION RELEASE COMMAND message (see NOTE 6) or PDU SESSION MODIFICATION COMMAND message or PDU SESSION AUTHENTICATION COMMAND message or DEREGISTRATION REQUEST message with the re-registration type "re-registration required"

None

Back-off timer

defined in 3GPP TS 24.008 [12]

T3586
NOTE 4

NOTE 5

8s

In WB-N1/CE mode, 16s

For access via a satellite NG-RAN cell, 13s

NOTE 7

PDU SESSION ACTIVE

REMOTE UE REPORT message sent

REMOTE UE REPORT RESPONSE message received

On the 1st and 2nd expiry, retransmission of REMOTE UE REPORT message

On the 3rd expiry, the procedure is aborted (see subclause 6.6.2.4).

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 network may provide the value of this timer applicable to the derived QoS rules of a specific PDU session as RQ timer value in the PDU SESSION ESTABLISHMENT ACCEPT message and PDU SESSION MODIFICATION COMMAND message. The maximum value of the timer is 30 min. If the network indicates a value greater than the maximum value, then the UE shall use the maximum value.

NOTE 3: The value of this timer is provided by the network.

NOTE 4: In NB-N1 mode, then the timer value shall be calculated as described in subclause 4.18.

NOTE 5: In WB-N1 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-N1/CE mode (see subclause 4.20).

NOTE 6: If the PDU SESSION RELEASE COMMAND message includes the Back-off timer value IE where the timer value indicates neither zero nor deactivated and the 5GSM cause is not #39, the UE then starts the timer with the value provided in the Back-off timer value IE after stopping the existing timer (see subclause 6.3.3.3).

NOTE 7: In satellite NG-RAN access, this value shall be selected when satellite NG-RAN RAT type is NR(MEO) or NR(GEO).

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 of 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.

Table 10.3.2: Timers of 5GS session management – SMF side

TIMER NUM.

TIMER VALUE

STATE

CAUSE OF START

NORMAL STOP

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

T3590

NOTE 3

NOTE 4

15s

In WB-N1/CE mode, 23s

For access via a satellite NG-RAN cell, 21s

NOTE 5

PROCEDURE TRANSACTION PENDING

Transmission of PDU SESSION AUTHENTICATION COMMAND message

PDU SESSION AUTHENTICATION COMPLETE message received

Retransmission of PDU SESSION AUTHENTICATION COMMAND message

T3591

NOTE 3

NOTE 4

16s

In WB-N1/CE mode, 24s

For access via a satellite NG-RAN cell, 22s

NOTE 5

PDU SESSION MODIFICATION PENDING

Transmission of PDU SESSION MODIFICATION COMMAND message

PDU SESSION MODIFICATION COMPLETE message received or PDU SESSION MODIFICATION COMMAND REJECT message received

Retransmission of PDU SESSION MODIFICATION COMMAND message

T3592

NOTE 3

NOTE 4

16s

In WB-N1/CE mode, 24s

For access via a satellite NG-RAN cell, 22s

NOTE 5

PDU SESSION INACTIVE PENDING

Transmission of PDU SESSION RELEASE COMMAND message

PDU SESSION RELEASE COMPLETE message received or

N1 SM delivery skipped indication received

Retransmission of PDU SESSION RELEASE COMMAND message

T3593

NOTE 3

NOTE 4

Default

60s

(NOTE 2)

PDU SESSION MODIFICATION PENDING

Reception of PDU SESSION MODIFICATION COMPLETE message for transmitted PDU SESSION MODIFICATION COMMAND message where the PDU SESSION MODIFICATION COMMAND message included 5GSM cause #39

PDU SESSION RELEASE REQUEST message received

Network-requested PDU session release procedure performed

T3594

NOTE 3

NOTE 4

15s

In WB-N1/CE mode, 23s

For access via a satellite NG-RAN cell, 21s

NOTE 5

PROCEDURE TRANSACTION PENDING

Transmission of SERVICE-LEVEL AUTHENTICATION COMMAND message

SERVICE-LEVEL AUTHENTICATION COMPLETE message received

Retransmission of SERVICE-LEVEL AUTHENTICATION COMMAND message

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: If the PDU Session Address Lifetime value is sent to the UE in the PDU SESSION MODIFICATION COMMAND message then timer T3593 shall be started with the same value, otherwise it shall use a default value.

NOTE 3: In NB-N1 mode, the timer value shall be calculated as described in subclause 4.18.

NOTE 4: In WB-N1 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-N1/CE mode (see subclause 4.20).

NOTE 5: In satellite NG-RAN access, this value shall be selected when satellite NG-RAN RAT type is NR(MEO) or NR(GEO).

10.4 Timers of Multicast/Broadcast Services

Timers of 5GS session management are shown in table 10.4.1.

Table 10.4.1: Timers of Multicast/Broadcast Services

TIMER NUM.

TIMER VALUE

STATE

CAUSE OF START

NORMAL STOP

ON
EXPIRY

T3530

As described in subclause 6.3.2.3 and subclause 6.4.1.3

PDU SESSION ACTIVE

PDU SESSION MODIFICATION COMMAND message or PDU SESSION ESTABLISHMENT ACCEPT received with Received MBS information that includes MBS Decision set to "MBS join is rejected" and Rejection cause set to "multicast MBS session has not started or will not start soon" and an MBS back-off timer value

None

Initiating a request to join the multicast MBS session associated with the PDU session if still needed

Annex A (informative):
Cause values for 5GS mobility management