9.4 GPRS Mobility Management Messages

24.0083GPPCore network protocolsMobile radio interface Layer 3 specificationRelease 18Stage 3TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

9.4.1 Attach request

This message is sent by the MS to the network in order to perform a GPRS or combined GPRS attach. See table 9.4.1/3GPP TS 24.008.

Message type: ATTACH REQUEST

Significance: dual

Direction: MS to network

Table 9.4.1/3GPP TS 24.008: ATTACH REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	½
	Attach request message identity	Message type 10.4	M	V	1
	MS network capability	MS network capability 10.5.5.12	M	LV	3 – 9
	Attach type	Attach type 10.5.5.2	M	V	½
	GPRS ciphering key sequence number	Ciphering key sequence number 10.5.1.2	M	V	½
	DRX parameter	DRX parameter 10.5.5.6	M	V	2
	Mobile identity	Mobile identity 10.5.1.4	M	LV	6 – 9
	Old routing area identification	Routing area identification 10.5.5.15	M	V	6
	MS Radio Access capability	MS Radio Access capability 10.5.5.12a	M	LV	6 – 51
19	Old P-TMSI signature	P-TMSI signature 10.5.5.8	O	TV	4
17	Requested READY timer value	GPRS Timer 10.5.7.3	O	TV	2
9-	TMSI status	TMSI status 10.5.5.4	O	TV	1
33	PS LCS Capability	PS LCS Capability 10.5.5.22	O	TLV	3 – 4
11	Mobile station classmark 2	Mobile station classmark 2 10.5.1.6	O	TLV	5
20	Mobile station classmark 3	Mobile station classmark 3 10.5.1.7	O	TLV	2 – 34
40	Supported Codecs	Supported Codec List 10.5.4.32	O	TLV	5 – n
58	UE network capability	UE network capability 10.5.5.26	O	TLV	4 – 15
1A	Additional mobile identity	Mobile identity 10.5.1.4	O	TLV	7
1B	Additional old routing area identification	Routing area identification 2 10.5.5.15a	O	TLV	8
5D	Voice domain preference and UE’s usage setting	Voice domain preference and UE’s usage setting 10.5.5.28	O	TLV	3
D-	Device properties	Device properties 10.5.7.8	O	TV	1
E-	P-TMSI type	P-TMSI type 10.5.5.29	O	TV	1
C-	MS network feature support	MS network feature support 10.5.1.15	O	TV	1
14	Old location area identification	Location Area Identification 2 10.5.5.30	O	TLV	7
F-	Additional update type	Additional update type 10.5.5.0	O	TV	1
10	TMSI based NRI container	Network resource identifier container 10.5.5.31	O	TLV	4
6A	T3324 value	GPRS Timer 2 10.5.7.4	O	TLV	3
39	T3312 extended value	GPRS Timer 3 10.5.7.4a	O	TLV	3
6E	Extended DRX parameters	Extended DRX parameters 10.5.5.32	O	TLV	3

9.4.1.1 Old P-TMSI signature

The MS shall include this IE, if the MS holds a valid P-TMSI, P-TMSI signature and RAI, or if the TIN indicates "GUTI" and the MS holds a valid GUTI, or if the TIN is deleted and the MS holds a valid GUTI, but no valid P-TMSI and RAI. If the MS is configured for "AttachWithIMSI" as specified in 3GPP TS 24.368 [135] or 3GPP TS 31.102 [112] and is attaching in a new PLMN which is neither the registered PLMN nor in the list of equivalent PLMNs, the MS shall not include this IE.

9.4.1.2 Requested READY timer value

This IE may be included if the MS wants to indicate a preferred value for the READY timer.

9.4.1.3 TMSI status

This IE shall be included if the MS performs a combined GPRS attach and no valid TMSI is available.

9.4.1.4 PS LCS Capability

This IE shall be included if the MS supports at least one positioning method for the provision of location services (LCS) via the PS domain in Gb-mode.

9.4.1.5 UE network capability

An MS supporting S1 mode shall include this IE to indicate its capabilities to the network.

9.4.1.6 Mobile station classmark 2

This IE shall be included if the MS supports SRVCC to GERAN or UTRAN.

9.4.1.7 Mobile station classmark 3

This IE shall be included if the MS supports SRVCC to GERAN.

9.4.1.8 Supported Codecs

This IE shall be included if the MS supports SRVCC to GERAN or UTRAN to indicate its supported speech codecs for CS speech calls.

9.4.1.9 Additional mobile identity

The MS shall include this IE, if the TIN indicates "GUTI" and the MS holds a valid GUTI, P-TMSI and RAI. If the MS is configured for "AttachWithIMSI" as specified in 3GPP TS 24.368 [135] or 3GPP TS 31.102 [112] and is attaching in a new PLMN which is neither the registered PLMN nor in the list of equivalent PLMNs, the MS shall not include this IE.

9.4.1.10 Additional old routing area identification

The MS shall include this IE, if the TIN indicates "GUTI" and the MS holds a valid GUTI, P-TMSI and RAI.

9.4.1.11 Voice domain preference and UE’s usage setting

This IE shall be included if:

– the MS supports CS fallback and SMS over SGs, or the MS is configured to support IMS voice, or both; and

– the MS supports WB-S1 mode.

9.4.1.12 Device properties

This IE shall be included if the MS is configured for NAS signalling low priority.

9.4.1.13 P-TMSI type

The MS shall include this IE if the type of identity in the Mobile identity IE is set to "TMSI/P-TMSI/M-TMSI".

9.4.1.14 MS network feature support

This IE shall be included if the MS supports extended periodic timer T3312.

9.4.1.15 Old location area identification

The MS shall include this IE during a combined attach procedure, if the MS holds a valid LAI and the MS supports EMM combined procedures.

9.4.1.16 Additional update type

The MS shall include this IE if the MS initiates a combined GPRS attach procedure for GPRS services and "SMS-only service".

9.4.1.17 TMSI based NRI container

The MS shall include this IE during a combined attach procedure if it has a valid TMSI.

9.4.1.18 T3324 value

The MS may include this IE to request the use of PSM.

9.4.1.19 T3312 extended value

The MS may include this IE to request a particular T3312 value if the T3324 value IE is included.

9.4.1.20 Extended DRX parameters

The MS may include this IE to request the use of eDRX.

9.4.2 Attach accept

This message is sent by the network to the MS to indicate that the corresponding attach request has been accepted. See table 9.4.2/3GPP TS 24.008.

Message type: ATTACH ACCEPT

Significance: dual

Direction: network to MS

Table 9.4.2/3GPP TS 24.008: ATTACH ACCEPT message content

IEI

Information Element

Type/Reference

Presence

Format

Length

Protocol discriminator

10.2

1/2

Skip indicator

10.3.1

1/2

Attach accept message identity

Message type

10.4

Attach result

10.5.5.1

1/2

Force to standby

10.5.5.7

1/2

Periodic RA update timer

GPRS Timer

10.5.7.3

Radio priority for SMS

Radio priority

10.5.7.2

1/2

Radio priority for TOM8

Radio priority 2

10.5.7.5

1/2

Routing area identification

10.5.5.15

P-TMSI signature

10.5.5.8

Negotiated READY timer
value

GPRS Timer

10.5.7.3

Allocated P-TMSI

Mobile identity

10.5.1.4

TLV

MS identity

Mobile identity

10.5.1.4

TLV

7-10

GMM cause

10.5.5.14

T3302 value

GPRS Timer 2

10.5.7.4

TLV

Cell Notification

10.5.5.21

Equivalent PLMNs

PLMN List

10.5.1.13

TLV

5-47

B-

Network feature support

10.5.5.23

Emergency Number List

10.5.3.13

TLV

5-50

A-

Requested MS Information

10.5.5.25

T3319 value

GPRS Timer 2
10.5.7.4

TLV

T3323 value

GPRS Timer 2

10.5.7.4

TLV

T3312 extended value

GPRS Timer 3

10.5.7.4a

TLV

Additional network feature support

Additional network feature support
10.5.5.23A

TLV

T3324 value

GPRS Timer 2

10.5.7.4

TLV

Extended DRX parameters

10.5.5.32

TLV

C-

User Plane integrity indicator

10.5.5.34

Replayed MS network capability

MS network capability

10.5.5.12

TLV

4-10

Replayed MS Radio Access capability

MS Radio Access capability

10.5.5.12a

TLV

6 – 51

DCN-ID

10.5.5.35

TLV

PLMN identity of the CN operator

10.5.5.36

TLV

D-

Non-3GPP NW provided policies

10.5.5.37

9.4.2.1 P-TMSI signature

This IE may be included to assign an identity to the MS’s GMM context.

9.4.2.2 Negotiated READY timer value

This IE may be included to indicate a value for the READY timer.

9.4.2.3 Allocated P-TMSI

This IE may be included to assign a P-TMSI to an MS in case of a GPRS or combined GPRS attach.

9.4.2.4 MS identity

This IE may be included to assign or unassign a TMSI to an MS in case of a combined GPRS attach.

9.4.2.5 GMM cause

This IE shall be included when IMSI attach for non-GPRS services was not successful during a combined GPRS attach procedure.

9.4.2.6 T3302 value

This IE may be included to indicate a value for the T3302 timer.

9.4.2.7 Cell Notification (A/Gb mode only)

In A/Gb mode, this IE shall be included by the SGSN in order to indicate the ability to support the Cell Notification.

9.4.2.8 Equivalent PLMNs

The Equivalent PLMNs information element is included if the network wants to inform the mobile station of equivalent PLMNs.

9.4.2.9 Network feature support

This IE may be included to inform the MS of the support of certain features. If this IE is not included then the respective features are not supported.

9.4.2.10 Emergency Number List

This IE may be sent by the network. If this IE is sent, the contents of this IE indicates a list of emergency numbers valid within the same country as the PLMN from which this IE is received.

9.4.2.11 Requested MS Information

This IE may be sent by the network to request the MS to provide feature-related information.

9.4.2.12 T3319 value

This IE may be included to indicate a value for timer T3319.

9.4.2.13 T3323 value

The network may include this IE to indicate a value for timer T3323.

If the IE is not included, the MS shall use the default value.

9.4.2.14 T3312 extended value

The network may include this IE to provide the MS with a longer periodic routing area update timer.

9.4.2.15 Additional network feature support

The network may include this IE to inform the MS of the support of certain features. If this IE is not included then the MS shall interpret this as a receipt of an information element with all bits of the value part coded as zero.

9.4.2.16 T3324 value

The network shall include the T3324 value IE if:

– the MS included the T3324 value IE in the ATTACH REQUEST message; and

– the network supports PSM and accepts the use of PSM.

9.4.2.17 Extended DRX parameters

The network shall include the Extended DRX parameters IE if:

– the MS included the Extended DRX parameters IE in the ATTACH REQUEST message; and

– the network supports eDRX and accepts the use of eDRX.

9.4.2.18 User Plane integrity indicator

The network shall include the User Plane integrity indicator IE if the MS shall enable integrity protection of user plane data in LLC layer.

9.4.2.19 Replayed MS network capability

The network may include this IE if integrity protection and replay protection of GMM messages is to be used.

9.4.2.20 Replayed MS radio access capability

The network may include this IE if integrity protection and replay protection of GMM messages is to be used.

9.4.2.21 DCN-ID

This IE is included in the message when the network wishes to provide a DCN-ID to the MS.

9.4.2.22 PLMN identity of the CN operator

This IE is included in the message when the common PLMN identity included in the RAI does not identify the CN operator that has accepted the GPRS attach request in a shared network or in a multi-operator core network (MOCN) with common GERAN.

9.4.2.23 Non-3GPP NW provided policies

This IE is included if the network needs to indicate whether emergency numbers provided via non-3GPP access can be used to initiate MS detected emergency calls (see 3GPP TS 24.302 [156]). If this IE is not included then the MS shall interpret this as a receipt of an information element with all bits of the value part coded as zero.

9.4.3 Attach complete

This message is sent by the MS to the network if at least one of the following conditions is fulfilled:

– a P-TMSI and/or a TMSI was included within the attach accept message; or

– the network has requested the MS to provide feature-related information.

See table 9.4.3/3GPP TS 24.008.

Message type: ATTACH COMPLETE

Significance: dual

Direction: MS to network

Table 9.4.3/3GPP TS 24.008: ATTACH COMPLETE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Attach complete message identity	Message type 10.4	M	V	1
27	Inter RAT handover information	Inter RAT information container 10.5.5.24	O	TLV	3-250
2B	E-UTRAN inter RAT handover information	E-UTRAN inter RAT information container 10.5.5.27	O	TLV	3-257

9.4.3.1 Inter RAT handover information

This IE shall be included if the network has requested this information in the attach accept message.

9.4.3.2 E-UTRAN inter RAT handover information

This IE shall be included if the network has requested this information in the attach accept message.

9.4.4 Attach reject

This message is sent by the network to the MS to indicate that the corresponding attach request has been rejected. See table 9.4.4/3GPP TS 24.008.

Message type: ATTACH REJECT

Significance: dual

Direction: network to MS

Table 9.4.4/3GPP TS 24.008: ATTACH REJECT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Attach reject message identity	Message type 10.4	M	V	1
	GMM cause	GMM cause 10.5.5.14	M	V	1
2A	T3302 value	GPRS Timer 2 10.5.7.4	O	TLV	3
3A	T3346 value	GPRS timer 2 10.5.7.4	O	TLV	3

9.4.4.1 T3302 value

This IE may be included to indicate a value for the T3302 timer.

In Iu mode, if the MS is not attaching for emergency services, the network shall not include this IE if this message is to be sent non-integrity protected. If the MS is attaching for emergency bearer services, the network may include this IE if this message is to be sent non-integrity protected.

In Iu mode, if the MS is not attaching for emergency services, the MS shall ignore the contents of this IE if this message is received without integrity protection. If the MS is attaching for emergency bearer services, the MS shall use the received contents of this IE if this message is received without integrity protection.

If this IE is not included or if in Iu mode the message is not integrity protected, the MS shall use the default value.

9.4.4.2 T3346 value

This IE may be included when the NAS level mobility management congestion control is active.

9.4.5 Detach request

9.4.5.1 Detach request (mobile terminated detach)

This message is sent by the network to request the release of a GMM context. See table 9.4.5.1/3GPP TS 24.008.

Message type: DETACH REQUEST

Significance: dual

Direction: network to MS

Table 9.4.5.1/3GPP TS 24.008:DETACH REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Detach request message identity	Message type 10.4	M	V	1
	Detach type	Detach type 10.5.5.5	M	V	1/2
	Force to standby	Force to standby 10.5.5.7	M	V	1/2
25	GMM cause	GMM cause 10.5.5.14	O	TV	2

9.4.5.1.1 GMM cause

This IE shall be included in case the detach reason has to be indicated to the MS, e.g. due to a failed IMEI check.

9.4.5.2 Detach request (mobile originating detach)

This message is sent by the MS to request the release of a GMM context. See table 9.4.5.2/3GPP TS 24.008.

Message type: DETACH REQUEST

Significance: dual

Direction: MS to network

Table 9.4.5.2/3GPP TS 24.008:DETACH REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Detach request message identity	Message type 10.4	M	V	1
	Detach type	Detach type 10.5.5.5	M	V	1/2
	Spare half octet	Spare half octet 10.5.1.8	M	V	1/2
18	P-TMSI	Mobile identity 10.5.1.4	O	TLV	7
19	P-TMSI signature	P-TMSI signature 2 10.5.5.8a	O	TLV	5

9.4.5.2.1 P-TMSI

This IE shall be included by the MS, if the P-TMSI is available.

9.4.5.2.2 P-TMSI signature

This IE shall be included if the MS has a valid P-TMSI signature.

9.4.6 Detach accept

9.4.6.1 Detach accept (mobile terminated detach)

This message is sent by the MS to indicate that the detach procedure has been completed. See table 9.4.6.1/3GPP TS 24.008.

Message type: DETACH ACCEPT

Significance: dual

Direction: MS to network

Table 9.4.6.1/3GPP TS 24.008:Detach ACCEPT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Detach accept message identity	Message type 10.4	M	V	1

9.4.6.2 Detach accept (mobile originating detach)

This message is sent by the network to indicate that the detach procedure has been completed. See table 9.4.6.2/3GPP TS 24.008.

Message type: DETACH ACCEPT

Significance: dual

Direction: network to MS

Table 9.4.6.2/3GPP TS 24.008:Detach ACCEPT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Detach accept message identity	Message type 10.4	M	V	1
	Force to standby	Force to standby 10.5.5.7	M	V	1/2
	Spare half octet	Spare half octet 10.5.1.8	M	V	1/2

9.4.7 P-TMSI reallocation command

This message is sent by the network to the MS to reallocate a P-TMSI and optionally assign a DCN-ID. See table 9.4.7/3GPP TS 24.008.

Message type: P-TMSI REALLOCATION COMMAND

Significance: dual

Direction: network to MS

Table 9.4.7/3GPP TS 24.008: P-TMSI REALLOCATION COMMAND message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	P-TMSI reallocation command message identity	Message type 10.4	M	V	1
	Allocated P-TMSI	Mobile identity 10.5.1.4	M	LV	6
	Routing area identification	Routing area identification 10.5.5.15	M	V	6
	Force to standby	Force to standby 10.5.5.7	M	V	1/2
	Spare half octet	Spare half octet 10.5.1.8	M	V	1/2
19	P-TMSI signature	P-TMSI signature 10.5.5.8	O	TV	4
65	DCN-ID	DCN-ID 10.5.5.35	O	TLV	4

9.4.7.1 P-TMSI signature

This IE may be included to assign an identity to the MS’s GMM context.

9.4.7.2 DCN-ID

This IE may be included to assign a new DCN-ID to the MS.

9.4.8 P-TMSI reallocation complete

This message is sent by the MS to the network to indicate that reallocation of a P-TMSI has taken place. See table 9.4.8/3GPP TS 24.008.

Message type: P-TMSI REALLOCATION COMPLETE

Significance: dual

Direction: MS to network

Table 9.4.8/3GPP TS 24.008: P-TMSI REALLOCATION COMPLETE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	P-TMSI reallocation complete message identity	Message type 10.4	M	V	1

9.4.9 Authentication and ciphering request

This message is sent by the network to the MS to initiate authentication of the MS identity. Additionally, the ciphering mode is set, indicating whether ciphering will be performed or not. See table 9.4.9/3GPP TS 24.008.

Message type: AUTHENTICATION AND CIPHERING REQUEST

Significance: dual

Direction: network to MS

Table 9.4.9/TS 24.008: AUTHENTICATION AND CIPHERING REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Authentication and ciphering request message identity	Message type 10.4	M	V	1
	Ciphering algorithm	Ciphering algorithm 10.5.5.3	M	V	1/2
	IMEISV request	IMEISV request 10.5.5.10	M	V	1/2
	Force to standby	Force to standby 10.5.5.7	M	V	1/2
	A&C reference number	A&C reference number 10.5.5.19	M	V	1/2
21	Authentication parameter RAND	Authentication parameter RAND 10.5.3.1	O	TV	17
8-	GPRS ciphering key sequence number	Ciphering key sequence number 10.5.1.2	C	TV	1
28	Authentication parameter AUTN	Authentication parameter AUTN 10.5.3.1.1	O	TLV	18
31	Replayed MS network capability	MS network capability 10.5.5.12	O	TLV	4-10
9-	Integrity algorithm	Integrity algorithm 10.5.5.3a	O	TV	1
43	Message authentication code	Message authentication code 10.5.5.33	O	TLV	6
33	Replayed MS Radio Access capability	MS Radio Access capability 10.5.5.12a	O	TLV	6 – 51

9.4.9.1 Authentication Parameter RAND

This IE shall only be included if authentication shall be performed.

9.4.9.2 GPRS ciphering key sequence number

This IE is included if and only if the Authentication parameter RAND is contained in the message.

9.4.9.3 Authentication Parameter AUTN

This IE shall be present if and only if the authentication challenge is a UMTS authentication challenge.The presence or absence of this IE defines- in the case of its absence- a GSM authentication challenge or- in the case of its presence- a UMTS authentication challenge.

The MS shall ignore the IE if a SIM is inserted in the MS.

In UMTS, the MS shall reject the AUTHENTICATION & CIPHERING REQUEST message as specified in subclause 4.7.7.5.1 if this IE is not present and a USIM is inserted in the MS.

9.4.9.4 Replayed MS network capability

This IE is included if integrity protection and replay protection of GMM messages is to be used.

9.4.9.5 Integrity algorithm

This IE is included if integrity protection and replay protection of GMM messages is to be used.

9.4.9.6 Message authentication code

This IE is included if integrity protection of AUTHENTICATION AND CIPHERING REQUEST message and AUTHENTICATION AND CIPHERING RESPONSEmessages is to be used.

9.4.9.7 Replayed MS Radio Access Capability

This IE is included if integrity protection and replay protection of GMM messages is to be used.

9.4.10 Authentication and ciphering response

This message is sent by the MS to the network in response to an Authentication and ciphering request message. See table 9.4.10/3GPP TS 24.008.

Message type: AUTHENTICATION AND CIPHERING RESPONSE

Significance: dual

Direction: MS to network

Table 9.4.10/3GPP TS 24.008: AUTHENTICATION AND CIPHERING RESPONSE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Authentication and ciphering response message identity	GPRS message type 10.4	M	V	1
	A&C reference number	A&C reference number 10.5.5.19	M	V	1/2
	Spare half octet	Spare half octet 10.5.1.8	M	V	1/2
22	Authentication parameter Response	Authentication Response parameter 10.5.3.2	O	TV	5
23	IMEISV	Mobile identity 10.5.1.4	O	TLV	11
29	Authentication Response parameter (extension)	Authentication Response parameter 10.5.3.2.1	O	TLV	3-14
43	Message authentication code	Message authentication code 10.5.5.33	O	TLV	6

9.4.10.1 Authentication Response Parameter

This IE is included if authentication was requested within the corresponding authentication and ciphering request message. This IE contains the SRES, if the authentication challenge was for GSM or the RES (all or just the 4 most significant octets of) if it is a UMTS authentication challenge (see also subclause 9.4.10.2)

9.4.10.2 IMEISV

This IE is included if requested within the corresponding authentication and ciphering request message.

9.4.10.3 Authentication Response Parameter (extension)

This IE shall be included if and only if the authentication challenge was a UMTS authentication challenge and the RES parameter is greater than 4 octets in length. It shall contain the least significant remaining bits of the RES (the four most significant octets shall be sent in the Authentication Response Parameter IE (see subclause 9.2.3.1))

This IE shall not be included if a SIM is inserted in the MS.

9.4.10.4 Message authentication code

This IE is included if integrity protection and replay protection of GMM messages is to be used.

9.4.10a Authentication and Ciphering Failure

This message is sent by the mobile station to the network to indicate that authentication of the network has failed. See table 9.4.10a/3GPP TS 24.008.

Message type: AUTHENTICATION AND CIPHERING FAILURE

Significance: dual

Direction: mobile station to network

Table 9.4.10a/3GPP TS 24.008: AUTHENTICATION AND CIPHERING FAILURE message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	Protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	Authentication and Ciphering Failure	Message type	M	V	1
	Message type	10.4
	GMM Cause	GMM Cause 10.5.5.14	M	V	1
30	Authentication Failure parameter	Authentication Failure parameter	O	TLV	16
		10.5.3.2.2

9.4.10a.1 Authentication Failure parameter

This IE shall be sent if and only if the GMM cause was "Synch failure". It shall include the response to the authentication challenge from the USIM, which is made up of the AUTS parameter (see 3GPP TS 33.102 [5a]).

9.4.11 Authentication and ciphering reject

This message is sent by the network to the MS to indicate that authentication has failed (and that the receiving MS shall abort all activities). See table 9.4.11/3GPP TS 24.008.

Message type: AUTHENTICATION AND CIPHERING REJECT

Significance: dual

Direction: network to MS

Table 9.4.11/3GPP TS 24.008: AUTHENTICATION AND CIPHERING REJECT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Authentication and ciphering reject message identity	Message type 10.4	M	V	1

9.4.12 Identity request

This message is sent by the network to the MS to request submission of the MS identity according to the specified identity type. See table 9.4.12/3GPP TS 24.008.

Message type: IDENTITY REQUEST

Significance: dual

Direction: network to MS

Table 9.4.12/3GPP TS 24.008: IDENTITY REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Identity request message identity	Message type 10.4	M	V	1
	Identity type	Identity type 2 10.5.5.9	M	V	1/2
	Force to standby	Force to standby 10.5.5.7	M	V	1/2

9.4.13 Identity response

This message is sent by the MS to the network in response to an identity request message providing the requested identity. See table 9.4.13/3GPP TS 24.008.

Message type: IDENTITY RESPONSE

Significance: dual

Direction: MS to network

Table 9.4.13/3GPP TS 24.008: IDENTITY RESPONSE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Identity response message identity	Message type 10.4	M	V	1
	Mobile identity	Mobile identity 10.5.1.4	M	LV	4 – 10

9.4.14 Routing area update request

This message is sent by the MS to the network either to request an update of its location file or to request an IMSI attach for non-GPRS services. See table 9.4.14/3GPP TS 24.008.

Message type: ROUTING AREA UPDATE REQUEST

Significance: dual

Direction: MS to network

Table 9.4.14/3GPP TS 24.008: ROUTING AREA UPDATE REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Routing area update request message identity	Message type 10.4	M	V	1
	Update type	Update type 10.5.5.18	M	V	1/2
	GPRS ciphering key sequence number	Ciphering key sequence number 10.5.1.2	M	V	1/2
	Old routing area identification	Routing area identification 10.5.5.15	M	V	6
	MS Radio Access capability	MS Radio Access capability 10.5.5.12a	M	LV	6 – 51
19	Old P-TMSI signature	P-TMSI signature 10.5.5.8	O	TV	4
17	Requested READY timer value	GPRS Timer 10.5.7.3	O	TV	2
27	DRX parameter	DRX parameter 10.5.5.6	O	TV	3
9-	TMSI status	TMSI status 10.5.5.4	O	TV	1
18	P-TMSI	Mobile identity 10.5.1.4	O	TLV	7
31	MS network capability	MS network capability 10.5.5.12	O	TLV	4 – 10
32	PDP context status	PDP context status 10.5.7.1	O	TLV	4
33	PS LCS Capability	PS LCS Capability 10.5.5.22	O	TLV	3 – 4
35	MBMS context status	MBMS context status 10.5.7.6	O	TLV	2 – 18
58	UE network capability	UE network capability 10.5.5.26	O	TLV	4 – 15
1A	Additional mobile identity	Mobile identity 10.5.1.4	O	TLV	7
1B	Additional old routing area identification	Routing area identification 2 10.5.5.15a	O	TLV	8
11	Mobile station classmark 2	Mobile station classmark 2 10.5.1.6	O	TLV	5
20	Mobile station classmark 3	Mobile station classmark 3 10.5.1.7	O	TLV	2 – 34
40	Supported Codecs	Supported Codec List 10.5.4.32	O	TLV	5 – n
5D	Voice domain preference and UE’s usage setting	Voice domain preference and UE’s usage setting 10.5.5.28	O	TLV	3
E-	P-TMSI type	P-TMSI type 10.5.5.29	O	TV	1
D-	Device properties	Device properties 10.5.7.8	O	TV	1
C-	MS network feature support	MS network feature support 10.5.1.15	O	TV	1
14	Old location area identification	Location Area Identification 2 10.5.5.30	O	TLV	7
F-	Additional update type	Additional update type 10.5.5.0	O	TV	1
10	TMSI based NRI container	Network resource identifier container 10.5.5.31	O	TLV	4
6A	T3324 value	GPRS Timer 2 10.5.7.4	O	TLV	3
39	T3312 extended value	GPRS Timer 3 10.5.7.4a	O	TLV	3
6E	Extended DRX parameters	Extended DRX parameters 10.5.5.32	O	TLV	3

9.4.14.1 Old P-TMSI signature

The MS shall include this IE, if the MS received the IE from the network in an ATTACH ACCEPT or ROUTING AREA UPDATE ACCEPT message, or if the TIN indicates "GUTI" and the MS holds a valid GUTI.

9.4.14.2 Requested READY timer value

This IE may be included if the MS wants to indicate a preferred value for the READY timer.

9.4.14.3 DRX parameter

This IE shall be included if the MS changes the access network from GSM to UMTS, or the MS wants to indicate new DRX parameters to the network.

9.4.14.4 TMSI status

This IE shall be included if the MS performs a combined routing area update and no valid TMSI is available.

9.4.14.5 P-TMSI (Iu mode only)

This IE shall be included by the MS.

9.4.14.6 MS network capability

This IE shall be included by the MS to indicate its capabilities to the network.

9.4.14.7 PDP context status

This IE shall be included by the MS.

9.4.14.8 PS LCS Capability

This IE shall be included if the MS supports at least one positioning method for the provision of location services (LCS) via the PS domain in Gb-mode.

9.4.14.9 MBMS context status

This IE shall be included by the MS, if it has MBMS contexts with an SM state different from PDP-INACTIVE.

9.4.14.10 Additional mobile identity

This IE shall be included by the MS, if the TIN indicates "GUTI" and the MS holds a valid GUTI and P-TMSI and RAI.

9.4.14.11 Additional old routing area identification

This IE shall be included by the MS, if the TIN indicates "GUTI" and the MS holds a valid GUTI and P-TMSI and RAI.

9.4.14.12 UE network capability

An MS supporting S1 mode shall include this IE, unless the update type indicates "periodic update".

9.4.14.13 Mobile station classmark 2

This IE shall be included if the MS supports SRVCC to GERAN or UTRAN.

9.4.14.14 Mobile station classmark 3

This IE shall be included if the MS supports SRVCC to GERAN.

9.4.14.15 Supported Codecs

This IE shall be included if the MS supports SRVCC to GERAN or UTRAN to indicate its supported speech codecs for CS speech calls.

9.4.14.16 Voice domain preference and UE’s usage setting

This IE shall be included if and only if:

– the MS supports CS fallback and SMS over SGs, or the MS is configured to support IMS voice, or both, and

– the MS supports WB-S1 mode.

9.4.14.17 P-TMSI type

The MS shall include this IE.

9.4.14.18 Device properties

This IE shall be included if the MS is configured for NAS signalling low priority.

9.4.14.19 MS network feature support

This IE shall be included if the MS supports extended periodic timer T3312.

9.4.14.20 Old location area identification

The MS shall include this IE during a combined routing area updating procedure, if the MS holds a valid LAI and the MS supports EMM combined procedures.

9.4.14.21 Additional update type

The MS shall include this IE if the MS initiates a combined routing area updating procedure for GPRS services and "SMS-only service".

9.4.14.22 TMSI based NRI container

The MS shall include this IE if it has a valid TMSI.

9.4.14.23 T3324 value

The MS may include this IE to request the use of PSM.

9.4.14.24 T3312 extended value

The MS may include this IE to request a particular T3312 value if T3324 value IE is included.

9.4.14.25 Extended DRX parameters

The MS may include this IE to request the use of eDRX.

9.4.15 Routing area update accept

This message is sent by the network to the MS to provide the MS with GPRS mobility management related data in response to a routing area update request message. See table 9.4.15/3GPP TS 24.008.

Message type: routing area update accept

Significance: dual

Direction: network to MS

Table 9.4.15/3GPP TS 24.008: ROUTING AREA UPDATE ACCEPT message content

IEI

Information Element

Type/Reference

Presence

Format

Length

Protocol discriminator

10.2

1/2

Skip indicator

10.3.1

1/2

Routing area update accept message identity

Message type

10.4

Force to standby

10.5.5.7

1/2

Update result

10.5.5.17

1/2

Periodic RA update timer

GPRS Timer

10.5.7.3

Routing area identification

10.5.5.15

P-TMSI signature

10.5.5.8

Allocated P-TMSI

Mobile identity

10.5.1.4

TLV

MS identity

Mobile identity

10.5.1.4

TLV

7-10

List of Receive N‑PDU Numbers

Receive N‑PDU Number list

10.5.5.11

TLV

4 – 19

Negotiated READY timer value

GPRS Timer

10.5.7.3

GMM cause

10.5.5.14

T3302 value

GPRS Timer 2

10.5.7.4

TLV

Cell Notification

10.5.5.21

Equivalent PLMNs

PLMN List

10.5.1.13

TLV

5-47

PDP context status

10.5.7.1

TLV

B-

Network feature support

10.5.5.23

Emergency Number List

10.5.3.13

TLV

5-50

MBMS context status

10.5.7.6

TLV

2 – 18

A-

Requested MS Information

10.5.5.25

T3319 value

GPRS Timer 2
10.5.7.4

TLV

T3323 value

GPRS Timer 2

10.5.7.4

TLV

T3312 extended value

GPRS timer 3

10.5.7.4a

TLV

Additional network feature support

Additional network feature support
10.5.5.23A

TLV

T3324 value

GPRS Timer2

10.5.7.4

TLV

Extended DRX parameters

10.5.5.32

TLV

C-

User Plane integrity indicator

10.5.5.34

Replayed MS network capability

MS network capability

10.5.5.12

TLV

4-10

Replayed MS Radio Access Capability

MS Radio Access capability

10.5.5.12a

TLV

6 – 51

DCN-ID

10.5.5.35

TLV

PLMN identity of the CN operator

10.5.5.36

TLV

D-

Non-3GPP NW provided policies

10.5.5.37

9.4.15.1 P-TMSI signature

This IE may be included to assign an identity to the MS’s GMM context.

9.4.15.2 Allocated P-TMSI

This IE may be included to assign a P-TMSI to an MS in case of a GPRS or combined routing area updating procedure.

9.4.15.3 MS identity

This IE may be included to assign or unassign a TMSI to a MS in case of a combined routing area updating procedure.

9.4.15.4 List of Receive N‑PDU Numbers

This IE shall be included in case of an inter SGSN routing area updating from A/Gb mode to A/Gb mode, or inter SGSN routing area updating from Iu mode to A/Gb mode, or intra SGSN routing area updating from Iu mode to A/Gb mode, if there are PDP contexts that have been activated in LLC acknowledged transfer mode.

9.4.15.5 Negotiated READY timer value

This IE may be included to indicate a value for the READY timer.

9.4.15.6 GMM cause

This IE shall be included if the combined GPRS routing area updating procedure was successful for GPRS services only.

9.4.15.7 T3302 value

This IE may be included to indicate a value for the T3302 timer.

In Iu mode, if the MS is not attached for emergency bearer services, the network shall not include this IE if this message is to be sent non-integrity protected. If the MS is attached for emergency bearer services, the network may include this IE if this message is to be sent non-integrity protected.

In Iu mode, if this message is received without integrity protection the MS not attached for emergency bearer services shall ignore the contents of this IE and use the default value. If the MS is attached for emergency bearer services, the MS shall use the received contents of this IE if this message is received without integrity protection.

If this IE is not included in the message in A/Gb mode or if in Iu mode this IE is not included in an integrity protected message, the MS shall use the default value.

9.4.15.8 Cell Notification (A/Gb mode only)

In A/Gb mode, this IE shall be included if by the SGSN in order to indicate the ability to support the Cell Notification.

9.4.15.9 Equivalent PLMNs

The Equivalent PLMNs information element is included if the network wants to inform the mobile station of equivalent PLMNs.

9.4.15.10 PDP context status

This IE shall be included by the NW.

9.4.15.11 Network feature support

This IE may be included to inform the MS of the support of certain features. If this IE is not included then the respective features are not supported.

9.4.15.12 Emergency Number List

This IE may be sent by the network. If this IE is sent, the contents of this IE indicates a list of emergency numbers valid within the same MCC as in the cell on which this IE is received.

9.4.15.13 MBMS context status

This IE shall be included by the network, if it has MBMS contexts for the MS with an SM state different from PDP-INACTIVE.

9.4.15.14 Requested MS Information

This IE may be sent by the network to request the MS to provide feature-related information.

9.4.15.15 T3319 value

This IE may be included to indicate a value for timer T3319.

9.4.15.16 T3323 value

The network may include this IE to indicate a value for timer T3323.

If the IE is not included, the MS shall use the default value.

9.4.15.17 T3312 extended value

The network may include this IE to provide the MS with a longer periodic routing area update timer.

9.4.15.18 Additional network feature support

9.4.15.19 T3324 value

The network shall include the T3324 value IE if:

– the MS included the T3324 value IE in the ROUTING AREA UPDATE REQUEST message; and

– the network supports PSM and accepts the use of PSM.

9.4.15.20 Extended DRX parameters

The network shall include the Extended DRX parameters IE if:

– the MS included the Extended DRX parameters IE in the ROUTING AREA UPDATE REQUEST message; and

– the network supports eDRX and accepts the use of eDRX.

9.4.15.21 User Plane integrity indicator

The network shall include the User Plane integrity indicator IE if the MS shall enable integrity protection of user plane data in LLC layer.

9.4.15.22 Replayed MS network capability

The network may include this IE if integrity protection and replay protection of GMM messages is to be used.

9.4.15.23 Replayed MS Radio Access Capability

The network may include this IE if integrity protection and replay protection of GMM messages is to be used.

9.4.15.24 DCN-ID

This IE is included in the message when the network wishes to provide a DCN-ID to the MS.

9.4.15.25 PLMN identity of the CN operator

This IE is included in the message when the common PLMN identity included in the RAI does not identify the CN operator that has accepted the routing area update request in a shared network or in a multi-operator core network (MOCN) with common GERAN.

9.4.15.26 Non-3GPP NW provided policies

This IE is included if the network needs to indicate whether emergency numbers provided via non-3GPP access can be used to initiate UE detected emergency calls (see 3GPP TS 24.302 [156]). If this IE is not included then the UE shall interpret this as a receipt of an information element with all bits of the value part coded as zero.

9.4.16 Routing area update complete

This message shall be sent by the MS to the network in response to a routing area update accept message if at least one of the following conditions is fulfilled:

– a P-TMSI and/or a TMSI has been assigned;

– there are established LLC connections; or

– the network has requested the MS to provide feature-related information.

See table 9.4.16/3GPP TS 24.008.

Message type: routing area update complete

Significance: dual

Direction: MS to network

Table 9.4.16/3GPP TS 24.008: ROUTING AREA UPDATE COMPLETE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Routing area update complete message identity	Message type 10.4	M	V	1
26	List of Receive N‑PDU Numbers	Receive N‑PDU Number list 10.5.5.11	O	TLV	4 – 19
27	Inter RAT handover information	Inter RAT information container 10.5.5.24	O	TLV	3-250
2B	E-UTRAN inter RAT handover information	E-UTRAN inter RAT information container 10.5.5.27	O	TLV	3-257

9.4.16.1 List of Receive N‑PDU Numbers

This IE shall be included if the routing area update accept message contained this IE.

9.4.16.2 Inter RAT handover information

This IE shall be included if the network has requested this information in the routing area update accept message.

9.4.16.3 E-UTRAN inter RAT handover information

This IE shall be included if the network has requested this information in the routing area update accept message.

9.4.17 Routing area update reject

This message is sent by the network to the MS in order to reject the routing area update procedure. See table 9.4.17/3GPP TS 24.008.

Message type: routing area update reject

Significance: dual

Direction: network to MS

Table 9.4.17/3GPP TS 24.008: ROUTING AREA UPDATE REJECT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Routing area update reject message identity	Message type 10.4	M	V	1
	GMM cause	GMM cause 10.5.5.14	M	V	1
	Force to standby	Force to standby 10.5.5.7	M	V	1/2
	Spare half octet	Spare half octet 10.5.1.8	M	V	1/2
2A	T3302 value	GPRS Timer 2 10.5.7.4	O	TLV	3
3A	T3346 value	GPRS timer 2 10.5.7.4	O	TLV	3

9.4.17.1 T3302 value

This IE may be included to indicate a value for the T3302 timer.

In Iu mode, the MS not attached for emergency bearer services shall ignore the contents of this IE if this message is received without integrity protection. If the MS is attached for emergency bearer services, the MS shall use the received contents of this IE if this message is received without integrity protection.

If this IE is not included or if in Iu mode the message is not integrity protected, the MS shall use the default value.

9.4.17.2 T3346 value

This IE may be included when the general NAS level mobility management congestion control is active.

9.4.18 GMM Status

This message is sent by the MS or by the network at any time to report certain error conditions listed in clause 8. See table 9.4.18/3GPP TS 24.008.

Message type: GMM STATUS

Significance: local

Direction: both

Table 9.4.18/3GPP TS 24.008: GMM STATUS message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	GMM Status message identity	Message type 10.4	M	V	1
	GMM cause	GMM cause 10.5.5.14	M	V	1

9.4.19 GMM Information

This message is sent by the network at any time to sent certain information to the MS.
See table 9.4.19/3GPP TS 24.008.

Message type: GMM INFORMATION

Significance: local

Direction: network to MS

Table 9.4.19/3GPP TS 24.008: GMM INFORMATION message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	GMM Information message identity	Message type 10.4	M	V	1
43	Full name for network	Network name 10.5.3.5a	O	TLV	3 – ?
45	Short name for network	Network name 10.5.3.5a	O	TLV	3 – ?
46	Local time zone	Time zone 10.5.3.8	O	TV	2
47	Universal time and local time zone	Time zone and time 10.5.3.9	O	TV	8
48	LSA Identity	LSA Identifier 10.5.3.11	O	TLV	2-5
49	Network Daylight Saving Time	Daylight Saving Time 10.5.3.12	O	TLV	3

9.4.19.1 Full name for network

This IE may be sent by the network. If this IE is sent, the contents of this IE indicate the "full length name of the network" that the network wishes the mobile station to associate with the MCC and MNC contained in the routing area identification of the current cell.

9.4.19.2 Short name for network

This IE may be sent by the network. If this IE is sent, the contents of this IE indicate the "abbreviated name of the network" that the network wishes the mobile station to associate with the MCC and MNC contained in the routing area identification of the cell the MS is currently in.

9.4.19.3 Local time zone

This IE may be sent by the network. The mobile station should assume that this time zone applies to the routing area of the cell the MS is currently in.

If the local time zone has been adjusted for Daylight Saving Time, the network shall indicate this by including the IE Network Daylight Saving Time.

9.4.19.4 Universal time and local time zone

This IE may be sent by the network. The mobile station should assume that this time zone applies to the routing area the MS is currently in. The mobile station shall not assume that the time information is accurate.

If the local time zone has been adjusted for Daylight Saving Time, the network shall indicate this by including the IE Network Daylight Saving Time.

9.4.19.5 LSA Identity

This IE may be sent by the network. The contents of this IE indicate the LSA identity of the serving cell.

9.4.19.6 Network Daylight Saving Time

This IE may be sent by the network. If this IE is sent, the contents of this IE indicates the value that has been used to adjust the local time zone.

9.4.20 Service Request (Iu mode only)

This message is sent by the MS to transfer to establish logical association between the MS and the network. See table 9.4.20/3GPP TS 24.008.

Message type: Service Request

Significance: dual

Direction: MS to network

Table 9.4.20/3GPP TS 24.008: Contents of Service Request message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Service Request message identity	Message type 10.4	M	V	1
	Ciphering key sequence number	Ciphering key sequence number 10.5.1.2	M	V	1/2
	Service type	Service type 10.5.5.20	M	V	1/2
	P-TMSI	Mobile station identity 10.5.1.4	M	LV	6
32	PDP context status	PDP context status 10.5.7.1	O	TLV	4
35	MBMS context status	MBMS context status 10.5.7.6	O	TLV	2 – 18
36	Uplink data status	Uplink data status 10.5.7.7	O	TLV	4
D-	Device properties	Device properties 10.5.7.8	O	TV	1

9.4.20.1 PDP context status

This IE shall be included by the MS.

9.4.20.2 MBMS context status

This IE shall be included by the MS, if it has MBMS contexts with an SM state different from PDP-INACTIVE.

9.4.20.3 Uplink data status

This IE may be included by the MS when the Service Type is set to "data".

9.4.20.4 Device properties

This IE shall be included if the MS is configured for NAS signalling low priority.

9.4.21 Service Accept (Iu mode only)

This message is sent by the network in response to a Service Request message. See table 9.4.21/3GPP TS 24.008.

Message type: Service Accept

Significance: dual

Direction: network to MS

Table 9.4.21/3GPP TS 24.008: Contents of Service Accept message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Service Accept message identity	Message type 10.4	M	V	1
32	PDP context status	PDP context status 10.5.7.1	O	TLV	4
35	MBMS context status	MBMS context status 10.5.7.6	O	TLV	2 – 18

9.4.21.1 PDP context status

This IE shall be included by the NW.

9.4.21.2 MBMS context status

This IE shall be included by the network, if it has MBMS contexts for the MS with an SM state different from PDP-INACTIVE.

9.4.22 Service Reject (Iu mode only)

This message is sent by the network to the MS in order to reject the Service request procedure. See table 9.4.22/3GPP TS 24.008.

Message type: Service Reject

Significance: dual

Direction: network to MS

Table 9.4.22/3GPP TS 24.008: Contents of Service Reject message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Protocol discriminator	Protocol discriminator 10.2	M	V	1/2
	Skip indicator	Skip indicator 10.3.1	M	V	1/2
	Service Reject message identity	Message type 10.4	M	V	1
	GMM cause	GMM cause 10.5.5.14	M	V	1
3A	T3346 value	GPRS timer 2 10.5.7.4	O	TLV	3

9.4.22.1 T3346 value

This IE may be included when the general NAS level mobility management congestion control is active.