8 Message functional definitions and contents

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

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

8.1 Overview

8.2 5GS mobility management messages

8.2.1 Authentication request

8.2.1.1 Message definition

The AUTHENTICATION REQUEST message is sent by the AMF to the UE to initiate authentication of the UE identity. See table 8.2.1.1.1.

Message type: AUTHENTICATION REQUEST

Significance: dual

Direction: network to UE

Table 8.2.1.1.1: AUTHENTICATION REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Authentication request message identity	Message type 9.7	M	V	1
	ngKSI	NAS key set identifier 9.11.3.32	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	ABBA	ABBA 9.11.3.10	M	LV	3-n
21	Authentication parameter RAND (5G authentication challenge)	Authentication parameter RAND 9.11.3.16	O	TV	17
20	Authentication parameter AUTN (5G authentication challenge)	Authentication parameter AUTN 9.11.3.15	O	TLV	18
78	EAP message	EAP message 9.11.2.2	O	TLV-E	7-1503

8.2.1.2 Authentication parameter RAND

Authentication parameter RAND IE is included if the AUTHENTICATION REQUEST message is used in a 5G AKA authentication procedure.

8.2.1.3 Authentication parameter AUTN

Authentication parameter AUTN IE is included if the AUTHENTICATION REQUEST message is used in a 5G AKA authentication procedure.

8.2.1.4 Void

8.2.1.5 EAP message

EAP message IE is included if the AUTHENTICATION REQUEST message is used in an EAP based primary authentication and key agreement procedure.

8.2.2 Authentication response

8.2.2.1 Message definition

The AUTHENTICATION RESPONSE message is sent by the UE to the AMF to deliver a calculated authentication response to the network. See table 8.2.2.1.1.

Message type: AUTHENTICATION RESPONSE

Significance: dual

Direction: UE to network

Table 8.2.2.1.1: AUTHENTICATION RESPONSE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Authentication response message identity	Message type 9.7	M	V	1
2D	Authentication response parameter	Authentication response parameter 9.11.3.17	O	TLV	18
78	EAP message	EAP message 9.11.2.2	O	TLV-E	7-1503

8.2.2.2 Authentication response parameter

This IE is included if the message is sent in a 5G AKA based primary authentication and key agreement procedure.

8.2.2.3 EAP message

EAP message IE is included if the EAP message received in a related AUTHENTICATION REQUEST message was an EAP-request.

8.2.3 Authentication result

8.2.3.1 Message definition

The AUTHENTICATION RESULT message is sent by the AMF to the UE to provide result of EAP authentication of the UE identity. See table 8.2.3.1.1.

Message type: AUTHENTICATION RESULT

Significance: dual

Direction: network to UE

Table 8.2.3.1.1: AUTHENTICATION RESULT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Authentication result message identity	Message type 9.7	M	V	1
	ngKSI	NAS key set identifier 9.11.3.32	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	EAP message	EAP message 9.11.2.2	M	LV-E	6-1502
38	ABBA	ABBA 9.11.3.10	O	TLV	4-n

8.2.3.2 ABBA

This IE shall be included if the message contains an EAP message IE with an EAP-success message.

8.2.4 Authentication failure

8.2.4.1 Message definition

The AUTHENTICATION FAILURE message is sent by the UE to the AMF to indicate that authentication of the network has failed. See table 8.2.4.1.1.

Message type: AUTHENTICATION FAILURE

Significance: dual

Direction: UE to network

Table 8.2.4.1.1: AUTHENTICATION FAILURE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Authentication failure message identity	Message type 9.7	M	V	1
	5GMM cause	5GMM cause 9.11.3.2	M	V	1
30	Authentication failure parameter	Authentication failure parameter 9.11.3.14	O	TLV	16

8.2.4.2 Authentication failure parameter

This IE shall be included in a 5G AKA based primary authentication and key agreement procedure if and only if the 5GMM cause was #21 "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 33.501 [24]).

8.2.5 Authentication reject

8.2.5.1 Message definition

The AUTHENTICATION REJECT message is sent by the AMF to the UE to indicate that the authentication procedure has failed and that the UE shall abort all activities. See table 8.2.5.1.1.

Message type: AUTHENTICATION REJECT

Significance: dual

Direction: network to UE

Table 8.2.5.1.1: AUTHENTICATION REJECT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Authentication reject message identity	Message type 9.7	M	V	1
78	EAP message	EAP message 9.11.2.2	O	TLV-E	7-1503

8.2.5.2 EAP message

EAP message IE is included if the AUTHENTICATION REJECT message is used to convey EAP-failure message.

8.2.6 Registration request

8.2.6.1 Message definition

The REGISTRATION REQUEST message is sent by the UE to the AMF. See table 8.2.6.1.1.

Message type: REGISTRATION REQUEST

Significance: dual

Direction: UE to network

Table 8.2.6.1.1: REGISTRATION REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended Protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Registration request message identity	Message type 9.7	M	V	1
	5GS registration type	5GS registration type 9.11.3.7	M	V	1/2
	ngKSI	NAS key set identifier 9.11.3.32	M	V	1/2
	5GS mobile identity	5GS mobile identity 9.11.3.4	M	LV-E	6-n
C-	Non-current native NAS key set identifier	NAS key set identifier 9.11.3.32	O	TV	1
10	5GMM capability	5GMM capability 9.11.3.1	O	TLV	3-15
2E	UE security capability	UE security capability 9.11.3.54	O	TLV	4-10
2F	Requested NSSAI	NSSAI 9.11.3.37	O	TLV	4-74
52	Last visited registered TAI	5GS tracking area identity 9.11.3.8	O	TV	7
17	S1 UE network capability	S1 UE network capability 9.11.3.48	O	TLV	4-15
40	Uplink data status	Uplink data status 9.11.3.57	O	TLV	4-34
50	PDU session status	PDU session status 9.11.3.44	O	TLV	4-34
B-	MICO indication	MICO indication 9.11.3.31	O	TV	1
2B	UE status	UE status 9.11.3.56	O	TLV	3
77	Additional GUTI	5GS mobile identity 9.11.3.4	O	TLV-E	14
25	Allowed PDU session status	Allowed PDU session status 9.11.3.13	O	TLV	4-34
18	UE’s usage setting	UE’s usage setting 9.11.3.55	O	TLV	3
51	Requested DRX parameters	5GS DRX parameters 9.11.3.2A	O	TLV	3
70	EPS NAS message container	EPS NAS message container 9.11.3.24	O	TLV-E	4-n
74	LADN indication	LADN indication 9.11.3.29	O	TLV-E	3-811
8-	Payload container type	Payload container type 9.11.3.40	O	TV	1
7B	Payload container	Payload container 9.11.3.39	O	TLV-E	4-65538
9-	Network slicing indication	Network slicing indication 9.11.3.36	O	TV	1
53	5GS update type	5GS update type 9.11.3.9A	O	TLV	3
41	Mobile station classmark 2	Mobile station classmark 2 9.11.3.31C	O	TLV	5
42	Supported codecs	Supported codec list 9.11.3.51A	O	TLV	5-n
71	NAS message container	NAS message container 9.11.3.33	O	TLV-E	4-n
60	EPS bearer context status	EPS bearer context status 9.11.3.23A	O	TLV	4
6E	Requested extended DRX parameters	Extended DRX parameters 9.11.3.26A	O	TLV	3-4
6A	T3324 value	GPRS timer 3 9.11.2.5	O	TLV	3
67	UE radio capability ID	UE radio capability ID 9.11.3.68	O	TLV	3-n
35	Requested mapped NSSAI	Mapped NSSAI 9.11.3.31B	O	TLV	3-42
48	Additional information requested	Additional information requested 9.11.3.12A	O	TLV	3
1A	Requested WUS assistance information	WUS assistance information 9.11.3.71	O	TLV	3-n
A-	N5GC indication	N5GC indication 9.11.3.72	O	TV	1
30	Requested NB-N1 mode DRX parameters	NB-N1 mode DRX parameters 9.11.3.73	O	TLV	3
29	UE request type	UE request type 9.11.3.76	O	TLV	3
28	Paging restriction	Paging restriction 9.11.3.77	O	TLV	3-35
72	Service-level-AA container	Service-level-AA container 9.11.2.10	O	TLV-E	6-n
32	NID	NID 9.11.3.79	O	TLV	8
16	MS determined PLMN with disaster condition	PLMN identity 9.11.3.85	O	TLV	5
2A	Requested PEIPS assistance information	PEIPS assistance information 9.11.3.80	O	TLV	3-n
3B	Requested T3512 value	GPRS timer 3 9.11.2.5	O	TLV	3
3C	Unavailability period duration	GPRS timer 3 9.11.2.5	O	TLV	3

8.2.6.2 Non-current native NAS key set identifier

The UE shall include this IE if the UE has a valid non-current native 5G NAS security context when the UE performs an inter-system change from S1 mode to N1 mode in 5GMM-CONNECTED mode and the UE uses a mapped 5G NAS security context to protect the REGISTRATION REQUEST message.

8.2.6.3 5GMM capability

The UE shall include this IE, unless the UE performs a periodic registration updating procedure.

8.2.6.4 UE security capability

The UE shall include this IE, unless the UE performs a periodic registration updating procedure.

8.2.6.5 Requested NSSAI

This IE shall be included by the UE when performing the registration procedure if the 5GS registration type IE indicates:

a) "initial registration", according to the conditions specified in subclause 5.5.1.2.2; or

b) "mobility registration updating", according to the conditions specified in subclause 5.5.1.3.2.

8.2.6.6 Last visited registered TAI

This IE shall be included if the UE holds a valid last visited registered TAI.

8.2.6.7 S1 UE network capability

A UE supporting S1 mode shall include this IE, unless the UE performs a periodic registration updating procedure.

8.2.6.8 Uplink data status

This IE shall be included if the UE has uplink user data pending to be sent, unless the UE performs a periodic registration updating procedure.

8.2.6.9 PDU session status

This IE shall be included when the UE needs to indicate the PDU sessions that are associated with the access type that the message is sent over, that are active within the UE.

8.2.6.10 MICO indication

The UE may include this IE to request the use of MICO mode.

8.2.6.11 UE status

This IE shall be included if the UE in single-registration mode performs the registration procedure due to inter-system change from S1 mode to N1 mode or if the UE in dual-registration mode and EMM state EMM-REGISTERED performs initial registration.

8.2.6.12 Additional GUTI

This IE shall be included:

a) if the UE performs the registration procedure due to inter-system change from S1 mode to N1 mode, the UE operates in single-registration mode and the UE has a valid 5G-GUTI; or

b) the UE holds two valid native 5G-GUTIs and one of the valid native 5G-GUTI was assigned by the PLMN with which the UE is performing the registration.

8.2.6.13 Allowed PDU session status

This IE shall be included if the REGISTRATION REQUEST message is sent as a response to paging with the access type indicating non-3GPP access and the UE wants to indicate the user-plane resources of PDU session(s) associated with non-3GPP access allowed to be re-established over 3GPP access.

8.2.6.14 UE’s usage setting

This IE shall be included if the UE supports IMS voice.

8.2.6.15 Requested DRX parameters

If the UE wants to use or change the UE specific DRX parameters, the UE shall include the Requested DRX parameters IE in the REGISTRATION REQUEST message.

8.2.6.16 EPS NAS message container

The UE operating in the single-registration mode shall include this information element as specified in subclause 5.5.1.3.2 if the UE performs mobility from S1 mode to N1 mode in 5GMM-IDLE mode. The content of this message container is the complete integrity protected TRACKING AREA UPATE REQUEST message, using EPS security context.

The UE performing initial registration shall include this information element if

a) the UE:

1) was previously registered in S1 mode before entering state EMM-DEREGISTERED; and

2) has received an "interworking without N26 interface not supported" indication from the network; and

b) EPS security context and a valid 4G-GUTI are available.

The content of this message container is the complete integrity protected ATTACH REQUEST message, using EPS security context.

8.2.6.17 LADN indication

The UE shall include this information element when the UE needs to request LADN information for specific LADN DNN(s) or to indicate a request for LADN information.

8.2.6.17A Payload container type

This IE shall be included if the UE includes the Payload container IE.

NOTE: In this version of the protocol, the Payload container type IE in the REGISTRATION REQUEST message is set to "UE policy container" as described in subclauses 5.5.1.2.2 and 5.5.1.3.2.

8.2.6.18 Payload container

Within a PLMN, this IE shall be included if the UE has one or more stored UE policy sections identified by a UPSI with the PLMN ID part indicating the HPLMN or the selected PLMN for the registration procedure for mobility and periodic registration update due to inter-system change from S1 mode to N1 mode of a UE operating in the single-registration mode or for the registration procedure for initial registration.

Within an SNPN, this IE shall be included if the UE has one or more stored UE policy sections for the selected SNPN for the registration procedure for initial registration.

8.2.6.19 Network slicing indication

This IE shall be included when a requested NSSAI is included in the REGISTRATION REQUEST message and the requested NSSAI is created from the default configured NSSAI.

8.2.6.20 5GS update type

This IE shall be included when the UE is performing the registration procedure to indicate any of the following:

a) the UE requests the use of SMS over NAS or there is a change in the UE’s requirements to use SMS over NAS;

b) a change in the UE’s radio capability for NG-RAN; or

c) the UE requests CIoT 5GS optimizations.

8.2.6.21 NAS message container

This IE shall be included if the UE is sending a REGISTRATION REQUEST message as an initial NAS message, the UE has a valid 5G NAS security context and the UE needs to send non-cleartext IEs.

8.2.6.22 Requested extended DRX parameters

The UE shall include this IE if the UE needs to use extended DRX or change the extended DRX parameters.

8.2.6.23 EPS bearer context status

The UE shall include this IE if the UE operating in the single-registration mode performs inter-system change from S1 mode to N1 mode and the UE has locally deactivated EPS bearer context(s) for which interworking to 5GS is supported while the UE was in S1 mode without notifying the network.

8.2.6.24 T3324 value

The UE may include this IE during the registration update procedure if it requests to use MICO mode and use the active time timer.

8.2.6.25 Mobile station classmark 2

This IE shall be included if the UE supports 5G-SRVCC from NG-RAN to UTRAN (see 3GPP TS 23.216 [6A]).

8.2.6.26 Supported codecs

This IE shall be included if the UE supports 5G-SRVCC from NG-RAN to UTRAN.

8.2.6.27 UE radio capability ID

This IE shall be included if the UE is not in NB-N1 mode, the UE supports RACS and the UE needs to signal a UE radio capability ID to the network.

8.2.6.28 Requested mapped NSSAI

This IE shall be included by the UE when the UE has a PDN connection or a PDU session to transfer to visited PLMN associated only with an S-NSSAI that is applicable in the HPLMN as specified in clause 5.5.1.3.2.

8.2.6.29 Additional information requested

The UE shall include this IE if the UE supports ciphered broadcast assistance data and the UE needs to obtain new ciphering keys for ciphered broadcast assistance data.

8.2.6.30 Requested WUS assistance information

The UE may include this IE if:

– the UE supports WUS assistance information;

– the UE is not performing initial registration for emergency services; and

– the UE does not have an active emergency PDU session.

8.2.6.31 Void

8.2.6.32 N5GC indication

This IE shall be included in the REGISTRATION REQUEST message when the W-AGF is acting on behalf of an N5GC device.

8.2.6.33 Requested NB-N1 mode DRX parameters

The UE shall include this IE if the UE wants to use or change the UE specific DRX parameters for NB-N1 mode.

8.2.6.34 UE request type

The UE shall include this IE if the MUSIM UE requests the release of the NAS signalling connection.

8.2.6.35 Paging restriction

The UE shall include this IE if the Request type is set to "NAS signalling connection release" in the UE request type IE and the UE requests the network to restrict paging.

8.2.6.35 Service-level-AA container

The UE shall include this IE if the UE supporting UAS services requests a registration for UAS services.

8.2.6.36 NID

The UE shall include this IE if the 5G-GUTI in the 5GS mobile identity IE was assigned by an SNPN other than the SNPN with which the UE is registering.

8.2.6.37 MS determined PLMN with disaster condition

The UE shall include this IE when the UE needs to indicate the MS determined PLMN with disaster condition determined as specified in 3GPP TS 23.122 [5].

8.2.6.38 Requested PEIPS assistance information

The UE may include this IE if the UE supports NR paging subgrouping, the UE is not performing initial registration for emergency services, is not registered for emergency services and does not have an active emergency PDU session.

8.2.6.39 Requested T3512 value

The UE may include this IE during the registration procedure if it requests to use MICO mode and T3324 IE is included, to request a particular T3512 timer value.

8.2.6.40 Unavailability period duration

This IE shall be included if an event is triggered in the UE that would make the UE unavailable for a certain period.

8.2.7 Registration accept

8.2.7.1 Message definition

The REGISTRATION ACCEPT message is sent by the AMF to the UE. See table 8.2.7.1.1.

Message type: REGISTRATION ACCEPT

Significance: dual

Direction: network to UE

Table 8.2.7.1.1: REGISTRATION ACCEPT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Registration accept message identity	Message type 9.7	M	V	1
	5GS registration result	5GS registration result 9.11.3.6	M	LV	2
77	5G-GUTI	5GS mobile identity 9.11.3.4	O	TLV-E	14
4A	Equivalent PLMNs	PLMN list 9.11.3.45	O	TLV	5-47
54	TAI list	5GS tracking area identity list 9.11.3.9	O	TLV	9-114
15	Allowed NSSAI	NSSAI 9.11.3.37	O	TLV	4-74
11	Rejected NSSAI	Rejected NSSAI 9.11.3.46	O	TLV	4-42
31	Configured NSSAI	NSSAI 9.11.3.37	O	TLV	4-146
21	5GS network feature support	5GS network feature support 9.11.3.5	O	TLV	3-5
50	PDU session status	PDU session status 9.11.3.44	O	TLV	4-34
26	PDU session reactivation result	PDU session reactivation result 9.11.3.42	O	TLV	4-34
72	PDU session reactivation result error cause	PDU session reactivation result error cause 9.11.3.43	O	TLV-E	5-515
79	LADN information	LADN information 9.11.3.30	O	TLV-E	12-1715
B-	MICO indication	MICO indication 9.11.3.31	O	TV	1
9-	Network slicing indication	Network slicing indication 9.11.3.36	O	TV	1
27	Service area list	Service area list 9.11.3.49	O	TLV	6-114
5E	T3512 value	GPRS timer 3 9.11.2.5	O	TLV	3
5D	Non-3GPP de-registration timer value	GPRS timer 2 9.11.2.4	O	TLV	3
16	T3502 value	GPRS timer 2 9.11.2.4	O	TLV	3
34	Emergency number list	Emergency number list 9.11.3.23	O	TLV	5-50
7A	Extended emergency number list	Extended emergency number list 9.11.3.26	O	TLV-E	7-65538
73	SOR transparent container	SOR transparent container 9.11.3.51	O	TLV-E	20-n
78	EAP message	EAP message 9.11.2.2	O	TLV-E	7-1503
A-	NSSAI inclusion mode	NSSAI inclusion mode 9.11.3.37A	O	TV	1
76	Operator-defined access category definitions	Operator-defined access category definitions 9.11.3.38	O	TLV-E	3-8323
51	Negotiated DRX parameters	5GS DRX parameters 9.11.3.2A	O	TLV	3
D-	Non-3GPP NW policies	Non-3GPP NW provided policies 9.11.3.36A	O	TV	1
60	EPS bearer context status	EPS bearer context status 9.11.3.23A	O	TLV	4
6E	Negotiated extended DRX parameters	Extended DRX parameters 9.11.3.26A	O	TLV	3-4
6C	T3447 value	GPRS timer 3 9.11.2.5	O	TLV	3
6B	T3448 value	GPRS timer 2 9.11.2.4	O	TLV	3
6A	T3324 value	GPRS timer 3 9.11.2.5	O	TLV	3
67	UE radio capability ID	UE radio capability ID 9.11.3.68	O	TLV	3-n
E-	UE radio capability ID deletion indication	UE radio capability ID deletion indication 9.11.3.69	O	TV	1
39	Pending NSSAI	NSSAI 9.11.3.37	O	TLV	4-146
74	Ciphering key data	Ciphering key data 9.11.3.18C	O	TLV-E	34-n
75	CAG information list	CAG information list 9.11.3.18A	O	TLV-E	3-n
1B	Truncated 5G-S-TMSI configuration	Truncated 5G-S-TMSI configuration 9.11.3.70	O	TLV	3
1C	Negotiated WUS assistance information	WUS assistance information 9.11.3.71	O	TLV	3-n
29	Negotiated NB-N1 mode DRX parameters	NB-N1 mode DRX parameters 9.11.3.73	O	TLV	3
68	Extended rejected NSSAI	Extended rejected NSSAI 9.11.3.75	O	TLV	5-90
7B	Service-level-AA container	Service-level-AA container 9.11.2.10	O	TLV-E	6-n
33	Negotiated PEIPS assistance information	PEIPS assistance information 9.11.3.80	O	TLV	3-n
34	5GS additional request result	5GS additional request result 9.11.3.81	O	TLV	3
70	NSSRG information	NSSRG information 9.11.3.82	O	TLV-E	7-4099
14	Disaster roaming wait range	Registration wait range 9.11.3.84	O	TLV	4
2C	Disaster return wait range	Registration wait range 9.11.3.84	O	TLV	4
13	List of PLMNs to be used in disaster condition	List of PLMNs to be used in disaster condition 9.11.3.83	O	TLV	2-n
1D	Forbidden TAI(s) for the list of "5GS forbidden tracking areas for roaming"	5GS tracking area identity list 9.11.3.9	O	TLV	9-114
1E	Forbidden TAI(s) for the list of "5GS forbidden tracking areas for regional provision of service"	5GS tracking area identity list 9.11.3.9	O	TLV	9-114
71	Extended CAG information list	Extended CAG information list 9.11.3.86	O	TLV-E	3-n
7C	NSAG information	NSAG information 9.11.3.87	O	TLV-E	9-3143
3D	Equivalent SNPNs	SNPN list 9.11.3.92	O	TLV	11-137
32	NID	NID 9.11.3.79	O	TLV	8

8.2.7.2 5G-GUTI

This IE may be included to assign a 5G-GUTI to a UE.

8.2.7.3 Equivalent PLMNs

This IE may be included in order to assign an equivalent PLMNs list to a UE.

8.2.7.4 TAI list

This IE may be included to assign a TAI list to a UE.

8.2.7.5 Allowed NSSAI

This IE shall be included:

a) if:

1) one or more S-NSSAIs in the requested NSSAI of the REGISTRATION REQUEST message are allowed by the AMF for a network not supporting NSSAA;

2) one or more S-NSSAIs in the requested NSSAI of the REGISTRATION REQUEST message are not subject to network slice-specific authentication and authorization and are allowed by the AMF; or

3) the network slice-specific authentication and authorization has been successfully performed for one or more S-NSSAIs in the requested NSSAI of the REGISTRATION REQUEST message; or

b) if the initial registration request is not for onboarding services in SNPN or the UE is not registered for onboarding services in SNPN, the requested NSSAI was not included in the REGISTRATION REQUEST message or none of the requested NSSAI are allowed; and

1) the network does not support NSSAA; or

2) the network has one or more default S-NSSAIs which are not subject to network slice-specific authentication and authorization.

8.2.7.6 Rejected NSSAI

The network may include this IE to inform the UE of one or more S-NSSAIs that were included in the requested NSSAI in the REGISTRATION REQUEST message but were rejected by the network.

8.2.7.7 Configured NSSAI

The network may include this IE if the network needs to provide the UE with a new configured NSSAI for the current PLMN or SNPN and the UE is neither registering nor registered for onboarding services in SNPN.

8.2.7.8 5GS network feature support

The network may include this IE to inform the UE of the support of certain features. 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.

8.2.7.9 PDU session status

This IE shall be included when the network needs to indicate the PDU sessions that are associated with the access type the message is sent over, that are active in the network.

8.2.7.10 PDU session reactivation result

This IE shall be included:

– if the Uplink data status IE is included in the REGISTRATION REQUEST message;

– if the Allowed PDU session status IE is included in the REGISTRATION REQUEST message and there is at least one PDU session indicated in the Allowed PDU session status IE for which the user-plane resources can be re-established over 3GPP access.

8.2.7.11 PDU session reactivation result error cause

This IE may be included, if the PDU session reactivation result IE is included and there exist one or more PDU sessions for which the user-plane resources cannot be re-established, to indicate the cause of failure to re-establish the user-plane resources.

8.2.7.12 LADN information

The network shall include this IE if there are valid LADN service area(s) for the subscribed DNN(s) of the UE in the current registration area.

8.2.7.13 MICO indication

The network shall include the MICO indication IE if:

a)- the UE included the MICO indication IE in the REGISTRATION REQUEST message; and

b) the network supports and accepts the use of MICO mode.

8.2.7.14 Network slicing indication

This IE shall be included if the user’s network slicing subscription has changed in the UDM of a PLMN or an SNPN.

8.2.7.15 Service area list

This IE may be included to assign new service area restrictions to the UE.

8.2.7.16 T3512 value

The AMF shall include this IE during a registration procedure over 3GPP access when the 5GS registration type IE does not indicate "periodic registration updating". The AMF may include this IE during the mobility and periodic registration update procedure over 3GPP access when the 5GS registration type IE indicates "periodic registration updating".

8.2.7.17 Non-3GPP de-registration timer value

This IE may be included if the network needs to indicate to the UE registered over non-3GPP access the value of a non-3GPP de-registration timer value.

8.2.7.18 T3502 value

This IE may be included to indicate a value for timer T3502.

8.2.7.19 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 in the PLMN from which this IE is received.

8.2.7.20 Extended 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 (with URN information) valid within the same country as in the PLMN from which this IE is received or valid only in the PLMN or SNPN from which this IE is received.

8.2.7.21 SOR transparent container

This IE may be sent by the network.

8.2.7.22 EAP message

EAP message IE is included if the REGISTRATION ACCEPT message is sent as part of registration for emergency services and is used to convey EAP-failure message.

8.2.7.23 NSSAI inclusion mode

This IE shall be included if required by operatory policy.

8.2.7.24 Operator-defined access category definitions

This IE may be included to assign new operator-defined access category definitions to the UE or delete the operator-defined access category definitions at the UE side.

8.2.7.25 Negotiated DRX parameters

The network shall include this IE if the Requested DRX parameters IE was included in the REGISTRATION REQUEST message.

8.2.7.26 Non-3GPP NW policies

The AMF shall not include this IE during a registration procedure over non-3GPP access.

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 [16]). 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.

NOTE: In this version of the specification, this IE is applicable in case the UE is connected to a PLMN using an ePDG as specified in 3GPP TS 24.302 [16].

8.2.7.27 Negotiated extended DRX parameters

The network shall include the Negotiated extended DRX parameters IE if:

– the UE included the Requested extended DRX parameters IE in the REGISTRATION REQUEST message; and

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

8.2.7.28 T3447 value

The network may include T3447 value IE if:

– the UE has indicated support for service gap control in the REGISTRATION REQUEST message; and

– the 5GMM context contains a service gap time value.

8.2.7.29 T3448 value

The network may include this IE if the congestion control for transport of user data via the control plane is active and the UE supports the control plane CIoT 5GS optimizations.

8.2.7.30 T3324 value

The AMF shall include this IE if the UE has requested active time value in the REGISTRATION REQEUST message and the AMF decides to accept the use of MICO mode and the use of the active time.

8.2.7.31 EPS bearer context status

This IE shall be included when the network generated an EPS bearer context status information for the UE during the inter-system change from S1 mode to N1 mode and the network supports N26 interface.

8.2.7.32 UE radio capability ID

This IE may be included if the UE is not in NB-N1 mode, both the UE and the network support RACS and the network needs to assign a network-assigned UE radio capability ID to the UE.

8.2.7.33 UE radio capability ID deletion indication

This IE may be included if the UE is not in NB-N1 mode, both the UE and the network support RACS and the network needs to trigger the UE to delete all network-assigned UE radio capability IDs stored at the UE for the serving PLMN or SNPN.

8.2.7.34 Pending NSSAI

The network may include this IE to inform the UE of one or more S-NSSAIs that are pending as the network slice-specific authentication and authorization procedure is not completed.

8.2.7.35 Ciphering key data

This IE is included if the network needs to send ciphering key data to the UE for ciphered broadcast assistance data.

8.2.7.36 CAG information list

This IE may be included to assign a new "CAG information list" to the UE or delete the "CAG information list" at the UE side.

8.2.7.37 Truncated 5G-S-TMSI configuration

The network shall include this IE if:

– the UE is in NB-N1 mode;

– the UE requests "control plane CIoT 5GS optimization" in the 5GS update type IE of REGISTRATION REQUEST message;

– the AMF decides to accept the requested CIoT 5GS optimization; and

– the network is configured to provide the truncated 5G-S-TMSI configuration for control plane CIoT 5GS optimizations.

8.2.7.38 Negotiated NB-N1 mode DRX parameters

The network shall include the Negotiated NB-N1 mode DRX parameters IE if the requested NB-N1 mode DRX parameters IE was included in the REGISTRATION REQUEST message.

8.2.7.39 Negotiated WUS assistance information

The network shall include the Negotiated WUS assistance information IE if:

– the UE supports WUS assistance information;

– the AMF supports and accepts the use of WUS assistance information;

– the UE is not performing the initial registration for emergency services; and

– the UE does not have an active emergency PDU session.

8.2.7.40 Extended rejected NSSAI

If the UE supports Extended rejected NSSAI, the network may include this IE to inform the UE of one or more S-NSSAIs that were included in the requested NSSAI in the REGISTRATION REQUEST message but were rejected by the network.

8.2.7.41 Service-level-AA container

The network shall include this IE if the UUAA procedure is triggered for the UE supporting UAS services. The network may include this IE if there is a valid successful UUAA result for the UE in the UE 5GMM context upon a registration for UAS services is requested from the UE.

8.2.7.42 Negotiated PEIPS assistance information

The network shall include the Negotiated PEIPS assistance information IE if:

– the UE supports NR paging subgrouping;

– the AMF supports and accepts the use of PEIPS assistance information for the UE; and

– the UE is not performing initial registration for emergency services and does not have an active emergency PDU session.

8.2.7.43 5GS additional request result

The network may include this IE to inform the UE about the result of additional request.

8.2.7.44 NSSRG information

This IE may be included to provide NSSRG information associated with the configured NSSAI.

8.2.7.45 Disaster roaming wait range

This IE may be included to assign a new disaster roaming wait range to the UE.

8.2.7.46 Disaster return wait range

This IE may be included to assign a new disaster return wait range to the UE.

8.2.7.47 List of PLMNs to be used in disaster condition

This IE may be included by an allowed PLMN to assign a new "list of PLMN(s) to be used in disaster condition" associated with the serving PLMN to the UE.

8.2.7.48 Forbidden TAI(s) for the list of "5GS forbidden tracking areas for roaming"

This IE is included to indicate the forbidden TAI(s) to be stored in the list of "5GS forbidden tracking areas for roaming". This IE is included only if the message is sent via satellite NG-RAN access.

8.2.7.49 Forbidden TAI(s) for the list of "5GS forbidden tracking areas for regional provision of service"

This IE is included to indicate the forbidden TAI(s) to be stored in the list of "5GS forbidden tracking areas for regional provision of service". This IE is included only if the message is sent via satellite NG-RAN access.

8.2.7.50 Extended CAG information list

If the UE supports Extended CAG information list, the network may include this IE to assign a new "CAG information list" to the UE or delete the "CAG information list" at the UE side.

8.2.7.51 NSAG information

If the UE has set the NSAG bit to "NSAG supported" in the 5GMM capability IE of the REGISTRATION REQUEST message over 3GPP access, the network may include this IE to provide NSAG information to the UE. Otherwise, the network shall not include this IE (see the ‘comprehension required’ scheme in subclause 11.2.5 of 3GPP TS 24.007 [11]).

8.2.7.52 Equivalent SNPNs

This IE may be included in order to assign a new equivalent SNPNs list to a UE, by an AMF of an SNPN.

8.2.7.53 NID

This IE shall be included if the UE supports equivalent SNPNs and the serving SNPN changes.

Editor’s note: (WI: eNPN_Ph2, CR 4835) Whether or not this IE is restricted to the mobility and periodic registration procedure is FFS.

8.2.8 Registration complete

8.2.8.1 Message definition

The REGISTRATION COMPLETE message is sent by the UE to the AMF. See table 8.2.8.1.1.

Message type: REGISTRATION COMPLETE

Significance: dual

Direction: UE to network

Table 8.2.8.1.1: REGISTRATION COMPLETE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Registration complete message identity	Message type 9.7	M	V	1
73	SOR transparent container	SOR transparent container 9.11.3.51	O	TLV-E	20

8.2.8.2 SOR transparent container

This IE may be sent by the UE. If this IE is sent, the contents of this IE indicates the UE acknowledgement of successful reception of the SOR transparent container IE in the REGISTRATION ACCEPT message. This IE shall indicate the ME support of SOR-CMCI.

8.2.9 Registration reject

8.2.9.1 Message definition

The REGISTRATION REJECT message is sent by the AMF to the UE. See table 8.2.9.1.1.

Message type: REGISTRATION REJECT

Significance: dual

Direction: network to UE

Table 8.2.9.1.1: REGISTRATION REJECT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Registration reject message identity	Message type 9.7	M	V	1
	5GMM cause	5GMM cause 9.11.3.2	M	V	1
5F	T3346 value	GPRS timer 2 9.11.2.4	O	TLV	3
16	T3502 value	GPRS timer 2 9.11.2.4	O	TLV	3
78	EAP message	EAP message 9.11.2.2	O	TLV-E	7-1503
69	Rejected NSSAI	Rejected NSSAI 9.11.3.46	O	TLV	4-42
75	CAG information list	CAG information list 9.11.3.18A	O	TLV-E	3-n
68	Extended rejected NSSAI	Extended rejected NSSAI 9.11.3.75	O	TLV	5-90
2C	Disaster return wait range	Registration wait range 9.11.3.84	O	TLV	4
71	Extended CAG information list	Extended CAG information list 9.11.3.86	O	TLV-E	3-n
3A	Lower bound timer value	GPRS timer 3 9.11.2.5	O	TLV	3
1D	Forbidden TAI(s) for the list of "5GS forbidden tracking areas for roaming"	5GS tracking area identity list 9.11.3.9	O	TLV	9-114
1E	Forbidden TAI(s) for the list of "5GS forbidden tracking areas for regional provision of service"	5GS tracking area identity list 9.11.3.9	O	TLV	9-114
3E	N3IWF address	N3IWF information 9.11.3.93	O	TLV	6-n

NOTE: It is possible for AMFs compliant with version 17.7.0 or 17.8.0 of this specification to send the Forbidden TAI(s) for the list of "5GS forbidden tracking areas for roaming" IE with IEI of value "3B" for this message or the Forbidden TAI(s) for the list of "5GS forbidden tracking areas for regional provision of service" IE with IEI of value "3C" for this message.

8.2.9.2 T3346 value

The AMF may include this IE when the general NAS level mobility management congestion control is active

8.2.9.3 T3502 value

This IE may be included to indicate a value for timer T3502 during the initial registration.

8.2.9.4 EAP message

EAP message IE is included if the REGISTRATION REJECT message is used to convey EAP-failure message.

8.2.9.5 Rejected NSSAI

The network may include this IE to inform the UE of one or more S-NSSAIs that were included in the requested NSSAI in the REGISTRATION REQUEST message but were rejected by the network.

8.2.9.6 CAG information list

This IE may be included to assign a new "CAG information list" to the UE or delete the "CAG information list" at the UE side.

8.2.9.7 Extended rejected NSSAI

8.2.9.8 Disaster return wait range

This IE may be included to assign a new disaster return wait range to the UE.

8.2.9.9 Extended CAG information list

If the UE supports Extended CAG information list, the network may include this IE to assign a new "CAG information list" to the UE or delete the "CAG information list" at the UE side.

8.2.9.10 Lower bound timer value

The AMF may include this IE when the 5GMM cause is set to #78 "PLMN not allowed to operate at the present UE location", to provide a minimum time value for an entry added to the list of "PLMNs not allowed to operate at the present UE location".

8.2.9.11 Forbidden TAI(s) for the list of "5GS forbidden tracking areas for roaming"

8.2.9.12 Forbidden TAI(s) for the list of "5GS forbidden tracking areas for regional provision of service"

8.2.9.13 N3IWF address

The network may include this IE if the UE supports slice-based N3IWF selection over non-3GPP access network.

8.2.10 UL NAS transport

8.2.10.1 Message definition

The UL NAS TRANSPORT message transports message payload and associated information to the AMF. See table 8.2.10.1.1.

Message type: UL NAS TRANSPORT

Significance: dual

Direction: UE to network

Table 8.2.10.1.1: UL NAS TRANSPORT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	UL NAS TRANSPORT message identity	Message type 9.7	M	V	1
	Payload container type	Payload container type 9.11.3.40	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Payload container	Payload container 9.11.3.39	M	LV-E	3-65537
12	PDU session ID	PDU session identity 2 9.11.3.41	C	TV	2
59	Old PDU session ID	PDU session identity 2 9.11.3.41	O	TV	2
8-	Request type	Request type 9.11.3.47	O	TV	1
22	S-NSSAI	S-NSSAI 9.11.2.8	O	TLV	3-10
25	DNN	DNN 9.11.2.1B	O	TLV	3-102
24	Additional information	Additional information 9.11.2.1	O	TLV	3-n
A-	MA PDU session information	MA PDU session information 9.11.3.31A	O	TV	1
F-	Release assistance indication	Release assistance indication 9.11.3.46A	O	TV	1

8.2.10.2 PDU session ID

The UE shall include this IE when the Payload container type IE is set to "N1 SM information" or "CIoT user data.

8.2.10.3 Old PDU session ID

The UE shall include this IE if the UL NAS TRANSPORT message transports a PDU SESSION ESTABLISHMENT REQUEST message upon receiving the PDU SESSION MODIFICATION COMMAND message with the 5GSM cause IE set to #39 "reactivation requested" and the Payload container type IE is set to "N1 SM information".

8.2.10.4 Request type

The UE shall include this IE when the PDU session ID IE is included and the Payload container IE contains the PDU SESSION ESTABLISHMENT REQUEST message or the PDU SESSION MODIFICATION REQUEST which is not initiated to indicate a change of 3GPP PS data off UE status associated to a PDU session.

8.2.10.5 S-NSSAI

The UE may include this IE when the Request type IE is set to "initial request", "existing PDU session" or "MA PDU request", the Payload container type IE is set to "N1 SM information" and the UE is not registered for onboarding services in SNPN.

8.2.10.6 DNN

8.2.10.7 Additional information

The UE may include this IE when the Payload container type IE is set to "LTE Positioning Protocol (LPP) message container" or "Location services (LCS) message container".

8.2.10.8 MA PDU session information

The UE may include this IE if the Request type IE is included and is not set to "initial emergency request " or "existing emergency PDU session" in the UL NAS TRANSPORT message.

8.2.10.9 Release assistance indication

The UE may include this IE to inform the network whether:

– no further uplink and no further downlink data transmission is expected; or

– only a single downlink data transmission (e.g. acknowledgement or response to uplink data) and no further uplink data transmission subsequent to the uplink data transmission is expected.

8.2.11 DL NAS transport

8.2.11.1 Message definition

The DL NAS TRANSPORT message transports message payload and associated information to the UE. See table 8.2.11.1.1.

Message type: DL NAS TRANSPORT

Significance: dual

Direction: network to UE

Table 8.2.11.1.1: DL NAS TRANSPORT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	DL NAS TRANSPORT message identity	Message type 9.7	M	V	1
	Payload container type	Payload container type 9.11.3.40	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Payload container	Payload container 9.11.3.39	M	LV-E	3-65537
12	PDU session ID	PDU session identity 2 9.11.3.41	C	TV	2
24	Additional information	Additional information 9.11.2.1	O	TLV	3-n
58	5GMM cause	5GMM cause 9.11.3.2	O	TV	2
37	Back-off timer value	GPRS timer 3 9.11.2.5	O	TLV	3
3A	Lower bound timer value	GPRS timer 3 9.11.2.5	O	TLV	3

8.2.11.2 PDU session ID

The AMF shall include this IE when the Payload container type IE is set to "N1 SM information" or "CIoT user data container".

8.2.11.3 Additional information

The AMF may include this IE when the Payload container type IE is set to "LTE Positioning Protocol (LPP) message container" or "Location services (LCS) message container".

8.2.11.4 5GMM cause

The AMF shall include this IE when the Payload container IE contains an uplink payload which was not forwarded and the Payload container type IE is not set to "Multiple payloads".

8.2.11.5 Back-off timer value

The AMF shall include this IE when the Payload container IE contains an uplink 5GSM message which was not forwarded due to DNN based congestion control, S-NSSAI and DNN based congestion control, S-NSSAI only based congestion control or the DNN is not supported or not subscribed in a slice, and the Payload container type IE is not set to "Multiple payloads".

8.2.11.6 Lower bound timer value

8.2.12 De-registration request (UE originating de-registration)

8.2.12.1 Message definition

The DEREGISTRATION REQUEST message is sent by the UE to the AMF. See table 8.2.12.1.1.

Message type: DEREGISTRATION REQUEST

Significance: dual

Direction: UE to network

Table 8.2.12.1.1: DEREGISTRATION REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	De-registration request message identity	Message type 9.7	M	V	1
	De-registration type	De-registration type 9.11.3.20	M	V	1/2
	ngKSI	NAS key set identifier 9.11.3.32	M	V	1/2
	5GS mobile identity	5GS mobile identity 9.11.3.4	M	LV-E	6-n
3C	Unavailability period duration	GPRS timer 3 9.11.2.5	O	TLV	3

8.2.13 De-registration accept (UE originating de-registration)

8.2.13.1 Message definition

The DEREGISTRATION ACCEPT message is sent by the AMF to the UE. See table 8.2.13.1.1.

Message type: DEREGISTRATION ACCEPT

Significance: dual

Direction: network to UE

Table 8.2.13.1.1: DEREGISTRATION ACCEPT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	De-registration accept message identity	Message type 9.7	M	V	1

8.2.14 De-registration request (UE terminated de-registration)

8.2.14.1 Message definition

The DEREGISTRATION REQUEST message is sent by the AMF to the UE. See table 8.2.14.1.1.

Message type: DEREGISTRATION REQUEST

Significance: dual

Direction: network to UE

Table 8.2.14.1.1: DEREGISTRATION REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	De-registration request message identity	Message type 9.7	M	V	1
	De-registration type	De-registration type 9.11.3.20	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
58	5GMM cause	5GMM cause 9.11.3.2	O	TV	2
5F	T3346 value	GPRS timer 2 9.11.2.4	O	TLV	3
6D	Rejected NSSAI	Rejected NSSAI 9.11.3.46	O	TLV	4-42
75	CAG information list	CAG information list 9.11.3.18A	O	TLV-E	3-n
68	Extended rejected NSSAI	Extended rejected NSSAI 9.11.3.75	O	TLV	5-90
2C	Disaster return wait range	Registration wait range 9.11.3.84	O	TLV	4
71	Extended CAG information list	Extended CAG information list 9.11.3.86	O	TLV-E	3-n
3A	Lower bound timer value	GPRS timer 3 9.11.2.5	O	TLV	3
1D	Forbidden TAI(s) for the list of "5GS forbidden tracking areas for roaming"	5GS tracking area identity list 9.11.3.9	O	TLV	9-114
1E	Forbidden TAI(s) for the list of "5GS forbidden tracking areas for regional provision of service"	5GS tracking area identity list 9.11.3.9	O	TLV	9-114

8.2.14.2 5GMM cause

This information element is included if a 5GMM cause is provided.

8.2.14.3 T3346 value

The AMF may include this IE when the general NAS level mobility management congestion control is active.

8.2.14.4 Rejected NSSAI

The AMF may include this IE to inform the UE of one or more S-NSSAIs that were rejected by the network.

8.2.14.5 CAG information list

This IE may be included to assign a new "CAG information list" to the UE or delete the "CAG information list" at the UE side.

8.2.14.6 Extended rejected NSSAI

If the UE supports Extended rejected NSSAI, the AMF may include this IE to inform the UE of one or more S-NSSAIs that were rejected by the network.

8.2.14.7 Disaster return wait range

This IE may be included to assign a new disaster return wait range to the UE.

8.2.14.7A Extended CAG information list

If the UE supports Extended CAG information list, the network may include this IE to assign a new "CAG information list" to the UE or delete the "CAG information list" at the UE side.

8.2.14.8 Lower bound timer value

8.2.14.9 Forbidden TAI(s) for the list of "5GS forbidden tracking areas for roaming"

8.2.14.10 Forbidden TAI(s) for the list of "5GS forbidden tracking areas for regional provision of service"

8.2.15 De-registration accept (UE terminated de-registration)

8.2.15.1 Message definition

The DEREGISTRATION ACCEPT message is sent by the UE to the AMF. See table 8.2.15.1.1.

Message type: DEREGISTRATION ACCEPT

Significance: dual

Direction: UE to network

Table 8.2.15.1.1.1: DEREGISTRATION ACCEPT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	De-registration accept message identity	Message type 9.7	M	V	1

8.2.16 Service request

8.2.16.1 Message definition

The SERVICE REQUEST message is sent by the UE to the AMF in order to request the establishment of an N1 NAS signalling connection and/or to request the establishment of user-plane resources for PDU sessions which are established without user-plane resources. See table 8.2.16.1.1.

Message type: SERVICE REQUEST

Significance: dual

Direction: UE to network

Table 8.2.16.1.1: SERVICE REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Service request message identity	Message type 9.7	M	V	1
	ngKSI	NAS key set identifier 9.11.3.32	M	V	1/2
	Service type	Service type 9.11.3.50	M	V	1/2
	5G-S-TMSI	5GS mobile identity 9.11.3.4	M	LV-E	9
40	Uplink data status	Uplink data status 9.11.3.57	O	TLV	4-34
50	PDU session status	PDU session status 9.11.3.44	O	TLV	4-34
25	Allowed PDU session status	Allowed PDU session status 9.11.3.13	O	TLV	4-34
71	NAS message container	NAS message container 9.11.3.33	O	TLV-E	4-n
29	UE request type	UE request type 9.11.3.76	O	TLV	3
28	Paging restriction	Paging restriction 9.11.3.77	O	TLV	3-35

8.2.16.2 Uplink data status

This IE shall be included if the UE has uplink user data pending to be sent.

8.2.16.3 PDU session status

This IE shall be included when the UE needs to indicate the PDU sessions that are associated with the access type that the message is sent over, that are active within the UE.

8.2.16.4 Allowed PDU session status

This IE shall be included if the SERVICE REQUEST message is sent as a response to paging or notification via 3GPP access for PDU session(s) associated with non-3GPP access and the UE needs to indicate the user-plane resources of PDU session(s) associated with non-3GPP access allowed to be re-established over 3GPP access or if there is no PDU session(s) for which the UE allows the user-plane resources to be re-established over 3GPP access.

8.2.16.5 NAS message container

This IE shall be included if the UE is sending a SERVICE REQUEST message as an initial NAS message and the UE needs to send non-cleartext IEs.

8.2.16.6 UE request type

The UE shall include this IE if the MUSIM UE requests the release of the NAS signalling connection or rejects the paging request from the network.

8.2.16.7 Paging restriction

The UE shall include this IE if the Request type is set to "NAS signalling connection release" or to "Rejection of paging" in the UE request type IE and the UE requests the network to restrict paging.

8.2.17 Service accept

8.2.17.1 Message definition

The SERVICE ACCEPT message is sent by the AMF to the UE in order to accept the service request procedure. See table 8.2.17.1.1.

Message type: SERVICE ACCEPT

Significance: dual

Direction: network to UE

Table 8.2.17.1.1: SERVICE ACCEPT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Service accept message identity	Message type 9.7	M	V	1
50	PDU session status	PDU session status 9.11.3.44	O	TLV	4-34
26	PDU session reactivation result	PDU session reactivation result 9.11.3.42	O	TLV	4-34
72	PDU session reactivation result error cause	PDU session reactivation result error cause 9.11.3.43	O	TLV-E	5-515
78	EAP message	EAP message 9.11.2.2	O	TLV-E	7-1503
6B	T3448 value	GPRS timer 2 9.11.2.4	O	TLV	3
34	5GS additional request result	5GS additional request result 9.11.3.81	O	TLV	3
1D	Forbidden TAI(s) for the list of "5GS forbidden tracking areas for roaming"	5GS tracking area identity list 9.11.3.9	O	TLV	9-114
1E	Forbidden TAI(s) for the list of "5GS forbidden tracking areas for regional provision of service"	5GS tracking area identity list 9.11.3.9	O	TLV	9-114

8.2.17.2 PDU session status

This IE shall be included when the network needs to indicate the PDU sessions that are associated with the access type that the message is sent over that are active within the network.

8.2.17.3 PDU session reactivation result

This IE shall be included:

– if the Uplink data status IE is included in the SERVICE REQUEST message;

– if the Allowed PDU session status IE is included in the SERVICE REQUEST message and there is at least one PDU session indicated in the Allowed PDU session status IE for which user-plane resources can be re-established over 3GPP access.

8.2.17.4 PDU session reactivation result error cause

This IE may be included if the PDU session reactivation result IE is included and there exist one or more PDU sessions for which the user-plane resources cannot be re-established, to indicate the cause of failure to re-establish the user-plane resources.

8.2.17.5 EAP message

EAP message IE is included if the SERVICE ACCEPT message is sent to a UE registered for emergency services and is used to convey EAP-failure message.

8.2.17.6 T3448 value

The network may include this IE if the congestion control for transport of user data via the control plane is active and the UE supports the control plane CIoT 5GS optimizations.

8.2.17.7 5GS additional request result

The network may include this IE to inform the UE about the result of additional request.

8.2.17.8 Forbidden TAI(s) for the list of "5GS forbidden tracking areas for roaming"

8.2.17.9 Forbidden TAI(s) for the list of "5GS forbidden tracking areas for regional provision of service"

8.2.18 Service reject

8.2.18.1 Message definition

The SERVICE REJECT message is sent by the AMF to the UE in order to reject the service request procedure. See table 8.2.18.1.1.

Message type: SERVICE REJECT

Significance: dual

Direction: network to UE

Table 8.2.18.1.1: SERVICE REJECT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Service reject message identity	Message type 9.7	M	V	1
	5GMM cause	5GMM cause 9.11.3.2	M	V	1
50	PDU session status	PDU session status 9.11.3.44	O	TLV	4-34
5F	T3346 value	GPRS timer 2 9.11.2.4	O	TLV	3
78	EAP message	EAP message 9.11.2.2	O	TLV-E	7-1503
6B	T3448 value	GPRS timer 2 9.11.2.4	O	TLV	3
75	CAG information list	CAG information list 9.11.3.18A	O	TLV-E	3-n
2C	Disaster return wait range	Registration wait range 9.11.3.84	O	TLV	4
71	Extended CAG information list	Extended CAG information list 9.11.3.86	O	TLV-E	3-n
3A	Lower bound timer value	GPRS timer 3 9.11.2.5	O	TLV	3
1D	Forbidden TAI(s) for the list of "5GS forbidden tracking areas for roaming"	5GS tracking area identity list 9.11.3.9	O	TLV	9-114
1E	Forbidden TAI(s) for the list of "5GS forbidden tracking areas for regional provision of service"	5GS tracking area identity list 9.11.3.9	O	TLV	9-114

8.2.18.2 PDU session status

This IE shall be included when the network needs to indicate the PDU sessions that are associated with the access type that the message is sent over, that are active within the network.

8.2.18.3 T3346 value

The AMF may include this IE when the general NAS level mobility management congestion control is active.

8.2.18.4 EAP message

EAP message IE is included if the SERVICE REJECT message is used to convey EAP-failure message.

8.2.18.5 T3448 value

The network may include this IE if the congestion control for transport of user data via the control plane is active and the UE supports the control plane CIoT 5GS optimizations.

8.2.18.6 CAG information list

This IE may be included to assign a new "CAG information list" to the UE or delete the "CAG information list" at the UE side.

8.2.18.7 Disaster return wait range

This IE may be included to assign a new disaster return wait range to the UE.

8.2.18.8 Extended CAG information list

If the UE supports Extended CAG information list, the network may include this IE to assign a new "CAG information list" to the UE or delete the "CAG information list" at the UE side.

8.2.18.9 Lower bound timer value

8.2.18.10 Forbidden TAI(s) for the list of "5GS forbidden tracking areas for roaming"

8.2.18.11 Forbidden TAI(s) for the list of "5GS forbidden tracking areas for regional provision of service"

8.2.19 Configuration update command

8.2.19.1 Message definition

The CONFIGURATION UPDATE COMMAND message is sent by the AMF to the UE. See table 8.2.19.1.1.

Message type: CONFIGURATION UPDATE COMMAND

Significance: dual

Direction: network to UE

Table 8.2.19.1.1: CONFIGURATION UPDATE COMMAND message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Configuration update command message identity	Message type 9.7	M	V	1
D-	Configuration update indication	Configuration update indication 9.11.3.18	O	TV	1
77	5G-GUTI	5GS mobile identity 9.11.3.4	O	TLV-E	14
54	TAI list	5GS tracking area identity list 9.11.3.9	O	TLV	9-114
15	Allowed NSSAI	NSSAI 9.11.3.37	O	TLV	4-74
27	Service area list	Service area list 9.11.3.49	O	TLV	6-114
43	Full name for network	Network name 9.11.3.35	O	TLV	3-n
45	Short name for network	Network name 9.11.3.35	O	TLV	3-n
46	Local time zone	Time zone 9.11.3.52	O	TV	2
47	Universal time and local time zone	Time zone and time 9.11.3.53	O	TV	8
49	Network daylight saving time	Daylight saving time 9.11.3.19	O	TLV	3
79	LADN information	LADN information 9.11.3.30	O	TLV-E	3-1715
B-	MICO indication	MICO indication 9.11.3.31	O	TV	1
9-	Network slicing indication	Network slicing indication 9.11.3.36	O	TV	1
31	Configured NSSAI	NSSAI 9.11.3.37	O	TLV	4-146
11	Rejected NSSAI	Rejected NSSAI 9.11.3.46	O	TLV	4-42
76	Operator-defined access category definitions	Operator-defined access category definitions 9.11.3.38	O	TLV-E	3-8323
F-	SMS indication	SMS indication 9.11.3.50A	O	TV	1
6C	T3447 value	GPRS timer 3 9.11.2.5	O	TLV	3
75	CAG information list	CAG information list 9.11.3.18A	O	TLV-E	3-n
67	UE radio capability ID	UE radio capability ID 9.11.3.68	O	TLV	3-n
A-	UE radio capability ID deletion indication	UE radio capability ID deletion indication 9.11.3.69	O	TV	1
44	5GS registration result	5GS registration result 9.11.3.6	O	TLV	3
1B	Truncated 5G-S-TMSI configuration	Truncated 5G-S-TMSI configuration 9.11.3.70	O	TLV	3
C-	Additional configuration indication	Additional configuration indication 9.11.3.74	O	TV	1
68	Extended rejected NSSAI	Extended rejected NSSAI 9.11.3.75	O	TLV	5-90
72	Service-level-AA container	Service-level-AA container 9.11.2.10	O	TLV-E	6-n
70	NSSRG information	NSSRG information 9.11.3.82	O	TLV-E	7-4099
14	Disaster roaming wait range	Registration wait range 9.11.3.84	O	TLV	4
2C	Disaster return wait range	Registration wait range 9.11.3.84	O	TLV	4
13	List of PLMNs to be used in disaster condition	List of PLMNs to be used in disaster condition 9.11.3.83	O	TLV	2-n
71	Extended CAG information list	Extended CAG information list 9.11.3.86	O	TLV-E	3-n
1F	Updated PEIPS assistance information	PEIPS assistance information 9.11.3.80	O	TLV	3-n
73	NSAG information	NSAG information 9.11.3.87	O	TLV-E	9-3143
E-	Priority indicator	Priority indicator 9.11.3.91	O	TV	1

8.2.19.2 Configuration update indication

The AMF shall include this IE if the AMF needs to request an acknowledgement or a registration procedure from the UE.

8.2.19.3 5G-GUTI

This IE may be included to assign a new 5G GUTI to the UE.

8.2.19.4 TAI list

This IE may be included to assign a new TAI list to the UE.

8.2.19.5 Allowed NSSAI

This IE may be included to assign a new allowed NSSAI to the UE not registered for onboarding services in SNPN.

8.2.19.6 Service area list

This IE may be included to assign a new service area list to the UE.

8.2.19.7 Full name for network

This IE may be included to assign a new full name for network to the UE.

8.2.19.8 Short name for network

This IE may be included to assign a new short name for network to the UE.

8.2.19.9 Local time zone

This IE may be included to assign a new local time zone to the UE.

8.2.19.10 Universal time and local time zone

This IE may be included to assign new universal time and local time zone to the UE.

8.2.19.11 Network daylight saving time

This IE may be included to assign new network daylight saving time to the UE.

8.2.19.12 LADN information

This IE may be included to assign new LADN information to the UE or delete the LADN information at the UE side.

8.2.19.13 MICO indication

This IE may be included to request the UE to re-negotiate MICO mode.

8.2.19.14 Network slicing indication

This IE shall be included if the user’s network slicing subscription has changed in the UDM of a PLMN or an SNPN.

8.2.19.15 Configured NSSAI

The AMF shall include this IE when the AMF needs to provide the UE with a new configured NSSAI for the current PLMN or SNPN and the UE is neither registering nor registered for onboarding services in SNPN.

8.2.19.16 Rejected NSSAI

The network may include this IE to inform the UE of one or more S-NSSAIs that were previously sent to the UE in the allowed NSSAI or the pending NSSAI, but are now considered rejected by the network.

8.2.19.17 Operator-defined access category definitions

This IE may be included to assign new operator-defined access category definitions to the UE or delete the operator-defined access category definitions at the UE side.

8.2.19.18 SMS indication

This IE may be included to indicate that the ability for the UE to use SMS over NAS has changed.

8.2.19.19 T3447 value

This IE may be included to assign a new T3447 value to the UE.

8.2.19.20 CAG information list

This IE may be included to assign new "CAG information list" to the UE or delete the "CAG information list" at the UE side.

8.2.19.21 UE radio capability ID

This IE may be included if the UE is not in NB-N1 mode, both the UE and the network support RACS and the network needs to assign a network-assigned UE radio capability ID to the UE.

8.2.19.22 UE radio capability ID deletion indication

8.2.19.23 5GS registration result

This IE shall be included if the network wants to indicate to the UE that the UE is registered for emergency services.

8.2.19.24 Truncated 5G-S-TMSI configuration

This IE may be included to provide a new truncated 5G-S-TMSI configuration to the UE in NB-N1 mode if the network is configured to provide the truncated 5G-S-TMSI configuration for control plane CIoT 5GS optimizations.

8.2.19.25 Additional configuration indication

The network may include this IE when requesting the UE to register without the release of the N1 NAS signalling connection.

8.2.19.26 Extended rejected NSSAI

If the UE supports Extended rejected NSSAI, the network may include this IE to inform the UE of one or more S-NSSAIs that were previously sent to the UE in the allowed NSSAI or the pending NSSAI, but are now considered rejected by the network.

8.2.19.27 Service-level-AA container

The network shall include this IE when the AMF receives the Service-level-AA payload or the UUAA-MM result from the UAS-NF during the UUAA-MM procedure or the UUAA revocation procedure. The network shall also include this IE if the AMF receives from the UAS-AF, the CAA-Level UAV ID as part of the UUAA-MM procedure.

8.2.19.28 NSSRG information

This IE may be included to provide NSSRG information associated with the configured NSSAI.

8.2.19.29 Disaster roaming wait range

This IE may be included to assign a new disaster roaming wait range to the UE.

8.2.19.30 Disaster return wait range

This IE may be included to assign a new disaster return wait range to the UE.

8.2.19.31 List of PLMNs to be used in disaster condition

This IE may be included by an allowed PLMN to assign a new "list of PLMN(s) to be used in disaster condition" associated with the serving PLMN to the UE.

8.2.19.32 Extended CAG information list

If the UE supports Extended CAG information list, the network may include this IE to assign a new "CAG information list" to the UE or delete the "CAG information list" at the UE side.

8.2.19.33 Updated PEIPS assistance information

The AMF may include this IE if the UE supports NR paging subgrouping, the AMF supports and accepts the use of PEIPIS assistance information for the UE, the UE is not registered for emergency services, the UE does not have an active emergency PDU session, and the network needs to update PEIPS assistance information for the UE.

8.2.19.34 NSAG information

If the UE has set the NSAG bit to "NSAG supported" in the 5GMM capability IE of the REGISTRATION REQUEST message and the CONFIGURATION UPDATE COMMAND message is sent over 3GPP access, the network may include this IE to provide NSAG information to the UE.

8.2.19.35 Priority indicator

The network shall include this IE when it needs to inform the UE that the use of access identity 1 is valid or is no longer valid.

8.2.20 Configuration update complete

8.2.20.1 Message definition

The CONFIGURATION UPDATE COMPLETE message is sent by the UE to the AMF. See table 8.2.20.1.1.

Message type: CONFIGURATION UPDATE COMPLETE

Significance: dual

Direction: UE to network

Table 8.2.20.1.1: CONFIGURATION UPDATE COMPLETE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Configuration update complete message identity	Message type 9.7	M	V	1

8.2.20.2 Void

8.2.21 Identity request

8.2.21.1 Message definition

The IDENTITY REQUEST message is sent by the AMF to the UE to request the UE to provide specified identity. See table 8.2.21.1.1

Message type: IDENTITY REQUEST

Significance: dual

Direction: AMF to UE

Table 8.2.21.1.1: IDENTITY REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Identity request message identity	Message type 9.7	M	V	1
	Identity type	5GS identity type 9.11.3.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2

8.2.22 Identity response

8.2.22.1 Message definition

The IDENTITY RESPONSE message is sent by the UE to the AMF to provide the requested identity. See table 8.2.22.1.

Message type: IDENTITY RESPONSE

Significance: dual

Direction: UE to AMF

Table 8.2.22.1.1: IDENTITY RESPONSE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Identity response message identity	Message type 9.7	M	V	1
	Mobile identity	5GS mobile identity 9.11.3.4	M	LV-E	3-n

8.2.23 Notification

8.2.23.1 Message definition

The NOTIFICATION message is sent by the AMF to the UE to notify the UE to initiate a service request procedure. See table 8.2.23.1.1.

Message type: NOTIFICATION

Significance: dual

Direction: network to UE

Table 8.2.23.1.1: NOTIFICATION message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Notification message identity	Message type 9.7	M	V	1
	Access type	Access type 9.11.2.1A	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2

8.2.24 Notification response

8.2.24.1 Message definition

The NOTIFICATION RESPONSE message is sent by the UE to the AMF to notify the failure to initiate the service request procedure as a response of notification. See table 8.2.24.1.1.

Message type: NOTIFICATION RESPONSE

Significance: dual

Direction: UE to network

Table 8.2.2341.1: NOTIFICATION RESPONSE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Notification response message identity	Message type 9.7	M	V	1
50	PDU session status	PDU session status 9.11.3.44	O	TLV	4-34

8.2.24.2 PDU session status

This information element shall be included when the UE needs to indicate over non-3GPP access the type of the PDU sessions that are associated with the 3GPP access type that are active within the UE.

8.2.25 Security mode command

8.2.25.1 Message definition

The SECURITY MODE COMMAND message is sent by the AMF to the UE to establish NAS signalling security. See table 8.2.25.1.1.

Message type: SECURITY MODE COMMAND

Significance: dual

Direction: network to UE

Table 8.2.25.1.1: SECURITY MODE COMMAND message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Security mode command message identity	Message type 9.7	M	V	1
	Selected NAS security algorithms	NAS security algorithms 9.11.3.34	M	V	1
	ngKSI	NAS key set identifier 9.11.3.32	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Replayed UE security capabilities	UE security capability 9.11.3.54	M	LV	3-9
E-	IMEISV request	IMEISV request 9.11.3.28	O	TV	1
57	Selected EPS NAS security algorithms	EPS NAS security algorithms 9.11.3.25	O	TV	2
36	Additional 5G security information	Additional 5G security information 9.11.3.12	O	TLV	3
78	EAP message	EAP message 9.11.2.2	O	TLV-E	7-1503
38	ABBA	ABBA 9.11.3.10	O	TLV	4-n
19	Replayed S1 UE security capabilities	S1 UE security capability 9.11.3.48A	O	TLV	4-7

8.2.25.2 IMEISV request

The AMF may include this information element to request the UE to send its IMEISV with the corresponding SECURITY MODE COMPLETE message.

8.2.25.3 Void

8.2.25.4 Selected EPS NAS security algorithms

This IE shall be included if the AMF supports N26 interface, the UE set the S1 mode bit to "S1 mode supported" in the 5GMM capability IE of the REGISTRATION REQUEST message, and the AMF needs to provide the selected EPS NAS security algorithms to the UE.

8.2.25.5 Additional 5G security information

The network shall include this IE if:

a) the network needs to provide the UE with horizontal derivation parameter; or

b) the initial NAS message (i.e. REGISTRATION REQUEST or SERVICE REQUEST) does not successfully pass the integrity check at the AMF (see subclause 5.4.2.2).

8.2.25.6 EAP message

This IE is included when the EAP Success message is sent as part of the EAP based primary authentication and key agreement procedure, as specified in subclause 5.4.1.2.

8.2.25.7 ABBA

This IE shall be included if the message contains an EAP message IE with an EAP-success message.

8.2.25.8 Replayed S1 UE security capabilities

This IE shall be included if the Selected EPS NAS security algorithms information element is included.

8.2.26 Security mode complete

8.2.26.1 Message definition

The SECURITY MODE COMPLETE message is sent by the UE to the AMF in response to a SECURITY MODE COMMAND message. See table 8.2.26.1.1.

Message type: SECURITY MODE COMPLETE

Significance: dual

Direction: UE to network

Table 8.2.26.1.1: SECURITY MODE COMPLETE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Security mode complete message identity	Message type 9.6	M	V	1
77	IMEISV	5GS mobile identity 9.11.3.4	O	TLV-E	12
71	NAS message container	NAS message container 9.11.3.33	O	TLV-E	4-n
78	non-IMEISV PEI	5GS mobile identity 9.11.3.4	O	TLV-E	7-n

8.2.26.2 IMEISV

The UE shall include this information element, if the IMEISV was requested within the corresponding SECURITY MODE COMMAND message.

8.2.26.3 NAS message container

The UE shall include this information element:

a) if during an ongoing registration procedure or service request procedure, the AMF included the Additional 5G security information with the RINMR bit set to "Retransmission of the initial NAS message requested" in the SECURITY MODE COMMAND message as described in 3GPP TS 33.501 [24]; or

b) if during an ongoing registration procedure, the UE does not have a valid 5G NAS security context.

8.2.26.4 non-IMEISV PEI

The 5G-RG or the W-AGF acting on behalf of the FN-RG (or on behalf of the N5GC device) shall include this information element, if the IMEISV was requested within the corresponding SECURITY MODE COMMAND message, the IMEISV is not available but MAC address is available.

The UE shall include this information element, if the IMEISV was requested within the corresponding SECURITY MODE COMMAND message, the IMEISV is not available but EUI-64 is available.

8.2.27 Security mode reject

8.6.27.1 Message definition

The SECURITY MODE REJECT message is sent by the UE to the AMF to indicate that the corresponding security mode command has been rejected. See table 8.2.27.1.1.

Message type: SECURITY MODE REJECT

Significance: dual

Direction: UE to network

Table 8.2.27.1.1: SECURITY MODE REJECT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Security mode reject message identity	Message type 9.6	M	V	1
	5GMM cause	5GMM cause 9.11.3.2	M	V	1

8.2.28 Security protected 5GS NAS message

8.2.28.1 Message definition

This message is sent by the UE or the network to transfer a plain 5GS NAS message as specified in subclause 8.2 together with the sequence number and the message authentication code protecting the message. See table 8.2.28.1.1.

Message type: SECURITY PROTECTED 5GS NAS MESSAGE

Significance: dual

Direction: both

Table 8.2.28.1.1: SECURITY PROTECTED 5GS NAS MESSAGE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Message authentication code	Message authentication code 9.8	M	V	4
	Sequence number	Sequence number 9.10	M	V	1
	Plain 5GS NAS message	Plain 5GS NAS message 9.9	M	V	3-n

NOTE: The minimum length of Plain 5GS NAS message IE can be 2 octets if it includes a Test Mode Control message specified in 3GPP TS 38.509 [31AA].

8.2.29 5GMM status

8.2.29.1 Message definition

The 5GMM STATUS message is sent by the UE or by the AMF at any time to report certain error conditions. See table 8.2.28.1.1.

Message type: 5GMM STATUS

Significance: local

Direction: both

Table 8.2.29.1.1: 5GMM STATUS message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	5GMM STATUS message identity	Message type 9.7	M	V	1
	5GMM cause	5GMM cause 9.11.3.2	M	V	1

8.2.30 Control Plane Service request

8.2.30.1 Message definition

The CONTROL PLANE SERVICE REQUEST message is sent by the UE to the AMF when the UE is using 5GS services with control plane CIoT 5GS optimization. See table 8.2.30.1.1.

Message type: CONTROL PLANE SERVICE REQUEST

Significance: dual

Direction: UE to network

Table 8.2.30.1.1: CONTROL PLANE SERVICE REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Control plane service request message identity	Message type 9.7	M	V	1
	Control plane service type	Control plane service type 9.11.3.18D	M	V	1/2
	ngKSI	NAS key set identifier 9.11.3.32	M	V	1/2
6F	CIoT small data container	CIoT small data container 9.11.3.18B	O	TLV	4-257
8-	Payload container type	Payload container type 9.11.3.40	O	TV	1
7B	Payload container	Payload container 9.11.3.39	O	TLV-E	4-65538
12	PDU session ID	PDU session identity 2 9.11.3.41	C	TV	2
50	PDU session status	PDU session status 9.11.3.44	O	TLV	4-34
F-	Release assistance indication	Release assistance indication 9.11.3.46A	O	TV	1
40	Uplink data status	Uplink data status 9.11.3.57	O	TLV	4-34
71	NAS message container	NAS message container 9.11.3.33	O	TLV-E	4-n
24	Additional information	Additional information 9.11.2.1	O	TLV	3-n
25	Allowed PDU session status	Allowed PDU session status 9.11.3.13	O	TLV	4-34
29	UE request type	UE request type 9.11.3.76	O	TLV	3
28	Paging restriction	Paging restriction 9.11.3.77	O	TLV	3-35

8.2.30.2 CIoT small data container

This IE shall be included if the UE needs to send uplink small user data, SMS or location services message that is not more than 254 bytes, and there is no other optional IE to be sent.

NOTE: When the UE determines to use the CIoT small data container IE to send uplink data in this message, there is no other optional IEs in this message.

8.2.30.3 Payload container type

This IE shall be included if the UE includes the Payload container IE.

8.2.30.4 Payload container

This IE shall be included if the UE needs to send uplink CIoT user data, SMS or location services message.

8.2.30.5 PDU session ID

The UE shall include this IE when the Payload container type IE is set to "CIoT user data container".

8.2.30.6 PDU session status

This IE shall be included when the UE needs to indicate the PDU sessions that are associated with the access type that the message is sent over, that are active within the UE.

8.2.30.7 Release assistance indication

The UE may include this IE to inform the network whether:

– no further uplink and no further downlink data transmission is expected; or

– only a single downlink data transmission (e.g. acknowledgement or response to uplink data) and no further uplink data transmission subsequent to the uplink data transmission is expected.

8.2.30.8 Uplink data status

This IE shall be included if the UE has uplink user data pending to be sent over the user plane.

8.2.30.9 NAS message container

This IE shall be included if the UE is sending a CONTROL PLANE SERVICE REQUEST message as an initial NAS message and the UE needs to send non-cleartext IEs.

8.2.30.10 Additional information

The UE may include this IE when the Payload container type IE is set to "Location services message container".

8.2.30.11 Allowed PDU session status

This IE shall be included if the CONTROL PLANE SERVICE REQUEST message is sent as a response to paging or notification via 3GPP access for PDU session(s) associated with non-3GPP access and the UE needs to indicate the user-plane resources of PDU session(s) associated with non-3GPP access allowed to be re-established over 3GPP access or if there is no PDU session(s) for which the UE allows the user-plane resources to be re-established over 3GPP access.

8.2.30.12 UE request type

The UE shall include this IE if the MUSIM UE requests the release of the NAS signalling connection or rejects the paging request from the network.

8.2.30.13 Paging restriction

8.2.31 Network slice-specific authentication command

8.2.31.1 Message definition

The NETWORK SLICE-SPECIFIC AUTHENTICATION COMMAND message is sent by the AMF to the UE for authentication of the upper layers of the UE. See table 8.2.31.1.1.

Message type: NETWORK SLICE-SPECIFIC AUTHENTICATION COMMAND

Significance: dual

Direction: network to UE

Table 8.2.31.1.1: NETWORK SLICE-SPECIFIC AUTHENTICATION COMMAND message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	NETWORK SLICE-SPECIFIC AUTHENTICATION COMMAND message identity	Message type 9.7	M	V	1
	S-NSSAI	S-NSSAI 9.11.2.8	M	LV	2-5
	EAP message	EAP message 9.11.2.2	M	LV-E	6-1502

8.2.32 Network slice-specific authentication complete

8.2.32.1 Message definition

The NETWORK SLICE-SPECIFIC AUTHENTICATION COMPLETE message is sent by the UE to the AMF in response to the NETWORK SLICE-SPECIFIC AUTHENTICATION COMMAND message and indicates acceptance of the NETWORK SLICE-SPECIFIC AUTHENTICATION COMMAND message. See table 8.2.32.1.1.

Message type: NETWORK SLICE-SPECIFIC AUTHENTICATION COMPLETE

Significance: dual

Direction: UE to network

Table 8.2.32.1.1: NETWORK SLICE-SPECIFIC AUTHENTICATION COMPLETE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	NETWORK SLICE-SPECIFIC AUTHENTICATION COMPLETE message identity	Message type 9.7	M	V	1
	S-NSSAI	S-NSSAI 9.11.2.8	M	LV	2-5
	EAP message	EAP message 9.11.2.2	M	LV-E	6-1502

8.2.33 Network slice-specific authentication result

8.2.33.1 Message definition

The NETWORK SLICE-SPECIFIC AUTHENTICATION RESULT message is sent by the AMF to the UE for indicating the result of the network slice-specific authentication and authorization procedure. See table 8.2.33.1.1.

Message type: NETWORK SLICE-SPECIFIC AUTHENTICATION RESULT

Significance: dual

Direction: network to UE

Table 8.2.33.1.1: NETWORK SLICE-SPECIFIC AUTHENTICATION RESULT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	NETWORK SLICE-SPECIFIC AUTHENTICATION RESULT message identity	Message type 9.7	M	V	1
	S-NSSAI	S-NSSAI 9.11.2.8	M	LV	2-5
	EAP message	EAP message 9.11.2.2	M	LV-E	6-1502

8.2.34 Relay key request

8.2.34.1 Message definition

The RELAY KEY REQUEST message is sent by the UE to the AMF for initiation of PC5 keys establishment with the 5G ProSe remote UE as specified in 3GPP TS 33.503 [56]. See table 8.2.34.1.

Message type: RELAY KEY REQUEST

Significance: dual

Direction: UE to network

Table 8.2.34.1: RELAY KEY REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Relay key request message identity	Message type 9.7	M	V	1
	PRTI	ProSe relay transaction identity 9.11.3.88	M	V	1
	Relay key request parameters	Relay key request parameters 9.11.3.89	M	LV	22-65537

8.2.35 Relay key accept

8.2.35.1 Message definition

The RELAY KEY ACCEPT message is sent by the AMF to the UE as specified in 3GPP TS 33.503 [56]. See table 8.2.35.1.

Message type: RELAY KEY ACCEPT

Significance: dual

Direction: network to UE

Table 8.2.35.1: RELAY KEY ACCEPT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Relay key accept message identity	Message type 9.7	M	V	1
	PRTI	ProSe relay transaction identity 9.11.3.88	M	V	1
	Relay key response parameters	Relay key response parameters 9.11.3.90	M	LV-E	51-65537
78	EAP message	EAP message 9.11.2.2	O	TLV-E	7-1503

8.2.36 Relay key reject

8.2.36.1 Message definition

The RELAY KEY REJECT message is sent by the AMF to the UE to indicate the rejection of the relay key request. See table 8.2.36.1.

Message type: RELAY KEY REJECT

Significance: dual

Direction: network to UE

Table 8.2.36.1: RELAY KEY REJECT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Relay key reject message identity	Message type 9.7	M	V	1
	PRTI	ProSe relay transaction identity 9.11.3.88	M	V	1
78	EAP message	EAP message 9.11.2.2	O	LV-E	6-1502

8.2.36.2 EAP message

EAP message IE is included if the RELAY KEY REJECT message is used to convey EAP-failure message.

8.2.37 Relay authentication request

8.2.37.1 Message definition

The RELAY AUTHENTICATION REQUEST message is sent by the network to the UE to initiate authentication of the 5G ProSe remote UE as specified in 3GPP TS 33.503 [56]. See table 8.2.37.1.

Message type: RELAY AUTHENTICATION REQUEST

Significance: dual

Direction: Network to UE

Table 8.2.37.1: RELAY AUTHENTICATION REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Relay authentication request message identity	Message type 9.7	M	V	1
	PRTI	ProSe relay transaction identity 9.11.3.88	M	V	1
	EAP message	EAP message 9.11.2.2	M	LV-E	7-1503

8.2.38 Relay authentication response

8.2.38.1 Message definition

The RELAY AUTHENTICATION RESPONSE message is sent by the UE to the network to forward the authentication response from the 5G ProSe remote UE as specified in 3GPP TS 33.503 [56]. See table 8.2.38.1.

Message type: RELAY AUTHENTICATION RESPONSE

Significance: dual

Direction: UE to network

Table 8.2.38.1: RELAY AUTHENTICATION RESPONSE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	Security header type	Security header type 9.3	M	V	1/2
	Spare half octet	Spare half octet 9.5	M	V	1/2
	Relay authentication response message identity	Message type 9.7	M	V	1
	PRTI	ProSe relay transaction identity 9.11.3.88	M	V	1
	EAP message	EAP message 9.11.2.2	M	LV-E	6-1502

8.3 5GS session management messages

8.3.1 PDU session establishment request

8.3.1.1 Message definition

The PDU SESSION ESTABLISHMENT REQUEST message is sent by the UE to the SMF to initiate establishment of a PDU session. See table 8.3.1.1.1.

Message type: PDU SESSION ESTABLISHMENT REQUEST

Significance: dual

Direction: UE to network

Table 8.3.1.1.1: PDU SESSION ESTABLISHMENT REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	PDU SESSION ESTABLISHMENT REQUEST message identity	Message type 9.7	M	V	1
	Integrity protection maximum data rate	Integrity protection maximum data rate 9.11.4.7	M	V	2
9-	PDU session type	PDU session type 9.11.4.11	O	TV	1
A-	SSC mode	SSC mode 9.11.4.16	O	TV	1
28	5GSM capability	5GSM capability 9.11.4.1	O	TLV	3-15
55	Maximum number of supported packet filters	Maximum number of supported packet filters 9.11.4.9	O	TV	3
B-	Always-on PDU session requested	Always-on PDU session requested 9.11.4.4	O	TV	1
39	SM PDU DN request container	SM PDU DN request container 9.11.4.15	O	TLV	3-255
7B	Extended protocol configuration options	Extended protocol configuration options 9.11.4.6	O	TLV-E	4-65538
66	IP header compression configuration	IP header compression configuration 9.11.4.24	O	TLV	5-257
6E	DS-TT Ethernet port MAC address	DS-TT Ethernet port MAC address 9.11.4.25	O	TLV	8
6F	UE-DS-TT residence time	UE-DS-TT residence time 9.11.4.26	O	TLV	10
74	Port management information container	Port management information container 9.11.4.27	O	TLV-E	8-65538
1F	Ethernet header compression configuration	Ethernet header compression configuration 9.11.4.28	O	TLV	3
29	Suggested interface identifier	PDU address 9.11.4.10	O	TLV	11
72	Service-level-AA container	Service-level-AA container 9.11.2.10	O	TLV-E	6-n
70	Requested MBS container	Requested MBS container 9.11.4.30	O	TLV-E	8-65538
34	PDU session pair ID	PDU session pair ID 9.11.4.32	O	TLV	3
35	RSN	RSN 9.11.4.33	O	TLV	3

8.3.1.2 PDU session type

This IE shall be included in the message when the UE requests to establish a new PDU session.

8.3.1.3 SSC mode

This IE is included in the message when the UE requests to establish a new PDU session with a DN and requests an SSC mode.

8.3.1.4 Maximum number of supported packet filters

This IE shall be included in the message when the selected PDU session type is "IPv4", "IPv6", "IPv4v6" or "Ethernet" and the UE can support more than 16 packet filters for this PDU session.

8.3.1.5 5GSM capability

This IE is included in the message when the UE requests to establish a new PDU session or to transfer an existing PDN connection and any of the 5GSM capabilities supported by the UE is relevant for the PDU session.

8.3.1.6 Void

8.3.1.7 Always-on PDU session requested

The UE shall include this IE if the UE requests to establish a PDU session as an always-on PDU session.

8.3.1.8 SM PDU DN request container

This IE is included in the message when the UE requests to establish a new PDU session with a DN and needs to provide information for the PDU session authentication and authorization by the external DN.

8.3.1.9 Extended protocol configuration options

This IE is included in the message when the UE needs to transmit (protocol) data (e.g. configuration parameters, error codes or messages/events) to the network.

8.3.1.10 IP header compression configuration

The UE shall include the IP header compression configuration IE if:

– the PDU session type value of the PDU session type IE is set to "IPv4", "IPv6" or "IPv4v6";

– the UE indicates "Control Plane CIoT 5GS optimization supported" and "IP header compression for control plane CIoT 5GS optimization supported" in the 5GMM capability IE of the REGISTRATION REQUEST message; and

– the network indicates "Control plane CIoT 5GS optimization supported" and "IP header compression for control plane CIoT 5GS optimization supported" in the 5GS network support feature IE of the REGISTRATION ACCEPT message.

8.3.1.11 DS-TT Ethernet port MAC address

This IE shall be included in the message if the UE supports transfer of port management information containers and the UE requests to establish a new PDU session of "Ethernet" PDU session type.

8.3.1.12 UE-DS-TT residence time

This IE shall be included in the message if:

a) the UE supports transfer of port management information containers; and

b) the UE-DS-TT residence time is available at the UE.

8.3.1.13 Port management information container

This IE shall be included in the message if the UE supports transfer of port management information containers.

8.3.1.14 Ethernet header compression configuration

The UE shall include the Ethernet header compression configuration IE if:

– the PDU session type value of the PDU session type IE is set to "Ethernet";

– the UE indicated "Control Plane CIoT 5GS optimization supported" and "Ethernet header compression for control plane CIoT 5GS optimization supported" in the 5GMM capability IE of the REGISTRATION REQUEST message; and

– the network indicated "Control plane CIoT 5GS optimization supported" and "Ethernet header compression for control plane CIoT 5GS optimization supported" in the 5GS network support feature IE of the REGISTRATION ACCEPT message.

8.3.1.15 Suggested interface identifier

This IE may be included by the W-AGF acting on behalf of the FN-RG.

8.3.1.16 Service-level-AA container

This IE shall be included in the message when the UE needs to establish a PDU session for the UAS services.

8.3.1.17 Requested MBS container

This IE is included in the message when the UE requests to join one or more multicast MBS sessions that are associated with the PDU session.

8.3.1.18 PDU session pair ID

This IE shall be included in the message when the UE needs to include a PDU session pair ID.

8.3.1.19 RSN

This IE shall be included in the message when the UE needs to include an RSN.

8.3.2 PDU session establishment accept

8.3.2.1 Message definition

The PDU SESSION ESTABLISHMENT ACCEPT message is sent by the SMF to the UE in response to PDU SESSION ESTABLISHMENT REQUEST message and indicates successful establishment of a PDU session. See table 8.3.2.1.1.

Message type: PDU SESSION ESTABLISHMENT ACCEPT

Significance: dual

Direction: network to UE

Table 8.3.2.1.1: PDU SESSION ESTABLISHMENT ACCEPT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	PDU SESSION ESTABLISHMENT ACCEPT message identity	Message type 9.7	M	V	1
	Selected PDU session type	PDU session type 9.11.4.11	M	V	1/2
	Selected SSC mode	SSC mode 9.11.4.16	M	V	1/2
	Authorized QoS rules	QoS rules 9.11.4.13	M	LV-E	6-65538
	Session AMBR	Session-AMBR 9.11.4.14	M	LV	7
59	5GSM cause	5GSM cause 9.11.4.2	O	TV	2
29	PDU address	PDU address 9.11.4.10	O	TLV	7-31
56	RQ timer value	GPRS timer 9.11.2.3	O	TV	2
22	S-NSSAI	S-NSSAI 9.11.2.8	O	TLV	3-10
8-	Always-on PDU session indication	Always-on PDU session indication 9.11.4.3	O	TV	1
75	Mapped EPS bearer contexts	Mapped EPS bearer contexts 9.11.4.8	O	TLV-E	7-65538
78	EAP message	EAP message 9.11.2.2	O	TLV-E	7-1503
79	Authorized QoS flow descriptions	QoS flow descriptions 9.11.4.12	O	TLV-E	6-65538
7B	Extended protocol configuration options	Extended protocol configuration options 9.11.4.6	O	TLV-E	4-65538
25	DNN	DNN 9.11.2.1B	O	TLV	3-102
17	5GSM network feature support	5GSM network feature support 9.11.4.18	O	TLV	3-15
18	Serving PLMN rate control	Serving PLMN rate control 9.11.4.20	O	TLV	4
77	ATSSS container	ATSSS container 9.11.4.22	O	TLV-E	3-65538
C-	Control plane only indication	Control plane only indication 9.11.4.23	O	TV	1
66	IP header compression configuration	IP header compression configuration 9.11.4.24	O	TLV	5-257
1F	Ethernet header compression configuration	Ethernet header compression configuration 9.11.4.28	O	TLV	3
72	Service-level-AA container	Service-level-AA container 9.11.2.10	O	TLV-E	6-n
71	Received MBS container	Received MBS container 9.11.4.31	O	TLV-E	9-65538

8.3.2.2 5GSM cause

This IE is included when the selected PDU session type is different from the PDU session type requested by the UE.

8.3.2.3 PDU address

This IE is included when the selected PDU session type is "IPv4", "IPv6" or "IPv4v6".

8.3.2.4 RQ timer value

This IE is included when the network needs to provide the RQ timer value.

8.3.2.5 S-NSSAI

This IE shall be included in the message when the SMF received from the AMF an S-NSSAI together with the PDU SESSION ESTABLISHMENT REQUEST message, the PDU session is a non-emergency PDU session and the UE is not registered for onboarding services in SNPN.

8.3.2.6 Always-on PDU session indication

The network shall include this IE if the network decides to inform the UE whether the PDU session is established as an always-on PDU session.

8.3.2.7 Mapped EPS bearer contexts

This IE is included when interworking with EPS is supported for the PDU session.

8.3.2.8 EAP message

This IE is included when the external DN successfully performed authentication and authorization of the UE using EAP.

8.3.2.9 Authorized QoS flow descriptions

This IE is included when the network needs to provide authorized QoS flow descriptions.

8.3.2.10 Extended protocol configuration options

This IE is included in the message when the network needs to transmit (protocol) data (e.g. configuration parameters, error codes or messages/events) to the UE.

8.3.2.11 DNN

The IE shall be included in the message when the PDU session is a non-emergency PDU session and the UE is not registered for onboarding services in SNPN.

8.3.2.12 5GSM network feature support

This IE is included when the network needs to indicate support of 5GSM network features.

8.3.2.13 Void

8.3.2.14 Serving PLMN rate control

This IE shall be included when the network needs to indicate the maximum uplink control plane user data the UE is allowed to send per 6 minute interval.

8.3.2.15 ATSSS container

The IE shall be included in the message when the PDU session is an MA PDU session.

8.3.2.16 Control plane only indication

The network shall include the control plane only indication IE if the network determines that the associated PDU session is only for control plane CIoT 5GS optimization.

8.3.2.17 IP header compression configuration

The SMF may include the IP header compression configuration IE if:

– the network accepts an IP PDU session type;

– control plane CIoT 5GS optimization is selected; and

– the UE provided the IP header compression configuration IE in the PDU SESSION ESTABLISHMENT REQUEST message.

8.3.2.18 Ethernet header compression configuration

The SMF may include the Ethernet header compression configuration IE if:

– the network accepts an Ethernet PDU session type;

– control plane CIoT 5GS optimization is selected; and

– the UE provided the Ethernet header compression configuration IE in the PDU SESSION ESTABLISHMENT REQUEST message.

8.3.2.19 Service-level-AA container

The SMF shall include the Service-level-AA container IE if the service-level authentication and authorization procedure is completed successfully by the external DN.

8.3.2.20 Received MBS container

The network shall include this IE if the UE has requested to join one or more multicast MBS sessions.

8.3.3 PDU session establishment reject

8.3.3.1 Message definition

The PDU SESSION ESTABLISHMENT REJECT message is sent by the SMF to the UE in response to PDU SESSION ESTABLISHMENT REQUEST message and indicates unsuccessful establishment of a PDU session. See table 8.3.3.1.1.

Message type: PDU SESSION ESTABLISHMENT REJECT

Significance: dual

Direction: network to UE

Table 8.3.3.1.1: PDU SESSION ESTABLISHMENT REJECT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	PDU SESSION ESTABLISHMENT REJECT message identity	Message type 9.7	M	V	1
	5GSM cause	5GSM cause 9.11.4.2	M	V	1
37	Back-off timer value	GPRS timer 3 9.11.2.5	O	TLV	3
F-	Allowed SSC mode	Allowed SSC mode 9.11.4.5	O	TV	1
78	EAP message	EAP message 9.11.2.2	O	TLV-E	7-1503
61	5GSM congestion re-attempt indicator	5GSM congestion re-attempt indicator 9.11.4.21	O	TLV	3
7B	Extended protocol configuration options	Extended protocol configuration options 9.11.4.6	O	TLV-E	4-65538
1D	Re-attempt indicator	Re-attempt indicator 9.11.4.17	O	TLV	3
72	Service-level-AA container	Service-level-AA container 9.11.2.10	O	TLV-E	6-n

8.3.3.2 Back-off timer value

The network may include this IE if the 5GSM cause is not #28 "unknown PDU session type", #39 "reactivation requested", #46 "out of LADN service area", #50 "PDU session type IPv4 only allowed", #51 "PDU session type IPv6 only allowed", #54 "PDU session does not exist", #57 "PDU session type IPv4v6 only allowed", #58 "PDU session type Unstructured only allowed", #61 "PDU session type Ethernet only allowed", or #68 "not supported SSC mode", to request a minimum time interval before procedure retry is allowed.

8.3.3.3 Allowed SSC mode

This IE is included when the network rejects the PDU SESSION ESTABLISHMENT REQUEST with cause #68 "not supported SSC mode.

8.3.3.4 EAP message

This IE is included when the external DN unsuccessfully performed authentication and authorization of the UE using EAP.

8.3.3.4A 5GSM congestion re-attempt indicator

The network may include this IE only if it includes the Back-off timer value IE and the 5GSM cause value is either #67 "insufficient resources for specific slice and DNN" or #69 "insufficient resources for specific slice".

8.3.3.5 Extended protocol configuration options

This IE is included in the message when the network needs to transmit (protocol) data (e.g. configuration parameters, error codes or messages/events) to the UE.

8.3.3.6 Re-attempt indicator

The network may include this IE if the network includes the Back-off timer value IE and the 5GSM cause value is not #26 "insufficient resources", #28 "unknown PDU session type", #39 "reactivation requested", #46 "out of LADN service area", #54 "PDU session does not exist", #67 "insufficient resources for specific slice and DNN", #68 "not supported SSC mode", or #69 "insufficient resources for specific slice".

8.3.3.7 Service-level-AA container

The network shall include this IE if the service-level authentication and authorization procedure has completed unsuccessfully and the 5GSM cause is #29 "user authentication or authorization failed". The network shall include the service-level-AA response if provided by the DN in the service-level-AA container.

8.3.4 PDU session authentication command

8.3.4.1 Message definition

The PDU SESSION AUTHENTICATION COMMAND message is sent by the SMF to the UE for authentication of the UE establishing the PDU session or of the UE participating in the PDU session. See table 8.3.4.1.1.

Message type: PDU SESSION AUTHENTICATION COMMAND

Significance: dual

Direction: network to UE

Table 8.3.4.1.1: PDU SESSION AUTHENTICATION COMMAND message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	PDU SESSION AUTHENTICATION COMMAND message identity	Message type 9.7	M	V	1
	EAP message	EAP message 9.11.2.2	M	LV-E	6-1502
7B	Extended protocol configuration options	Extended protocol configuration options 9.11.4.6	O	TLV-E	4-65538

8.3.4.2 Extended protocol configuration options

This IE is included in the message when the network needs to transmit (protocol) data (e.g. configuration parameters, error codes or messages/events) to the UE.

NOTE: How the Extended protocol configuration options IE is used by the network and the UE during the PDU session authentication and authorization procedure is not specified in this release of the specification.

8.3.4.3 Void

8.3.5 PDU session authentication complete

8.3.5.1 Message definition

The PDU SESSION AUTHENTICATION COMPLETE message is sent by the UE to the SMF in response to the PDU SESSION AUTHENTICATION COMMAND message and indicates acceptance of the PDU SESSION AUTHENTICATION COMMAND message. See table 8.3.5.1.1.

Message type: PDU SESSION AUTHENTICATION COMPLETE

Significance: dual

Direction: UE to network

Table 8.3.5.1.1: PDU SESSION AUTHENTICATION COMPLETE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	PDU SESSION AUTHENTICATION COMPLETE message identity	Message type 9.7	M	V	1
	EAP message	EAP message 9.11.2.2	M	LV-E	6-1502
7B	Extended protocol configuration options	Extended protocol configuration options 9.11.4.6	O	TLV-E	4-65538

8.3.5.2 Extended protocol configuration options

This IE is included in the message when the UE needs to transmit (protocol) data (e.g. configuration parameters, error codes or messages/events) to the network.

8.3.5.3 Void

8.3.6 PDU session authentication result

8.3.6.1 Message definition

The PDU SESSION AUTHENTICATION RESULT message is sent by the SMF to the UE for indication of successful result of authentication of the UE participating in the PDU session. See table 8.3.6.1.1.

Message type: PDU SESSION AUTHENTICATION RESULT

Significance: dual

Direction: network to UE

Table 8.3.6.1.1: PDU SESSION AUTHENTICATION RESULT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	PDU SESSION AUTHENTICATION RESULT message identity	Message type 9.7	M	V	1
78	EAP message	EAP message 9.11.2.2	O	TLV-E	7-1503
7B	Extended protocol configuration options	Extended protocol configuration options 9.11.4.6	O	TLV-E	4-65538

8.3.6.2 EAP message

This IE shall be included when the external DN performs authentication and authorization of the UE using EAP and it completes successfully.

8.3.6.3 Extended protocol configuration options

This IE is included in the message when the network needs to transmit (protocol) data (e.g. configuration parameters, error codes or messages/events) to the UE.

8.3.7 PDU session modification request

8.3.7.1 Message definition

The PDU SESSION MODIFICATION REQUEST message is sent by the UE to the SMF to request a modification of a PDU session. See table 8.3.7.1.1.

Message type: PDU SESSION MODIFICATION REQUEST

Significance: dual

Direction: UE to network

Table 8.3.7.1.1: PDU SESSION MODIFICATION REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	PDU SESSION MODIFICATION REQUEST message identity	Message type 9.7	M	V	1
28	5GSM capability	5GSM capability 9.11.4.1	O	TLV	3-15
59	5GSM cause	5GSM cause 9.11.4.2	O	TV	2
55	Maximum number of supported packet filters	Maximum number of supported packet filters 9.11.4.9	O	TV	3
B-	Always-on PDU session requested	Always-on PDU session requested 9.11.4.4	O	TV	1
13	Integrity protection maximum data rate	Integrity protection maximum data rate 9.11.4.7	O	TV	3
7A	Requested QoS rules	QoS rules 9.11.4.13	O	TLV-E	7-65538
79	Requested QoS flow descriptions	QoS flow descriptions 9.11.4.12	O	TLV-E	6-65538
75	Mapped EPS bearer contexts	Mapped EPS bearer contexts 9.11.4.8	O	TLV-E	7-65538
7B	Extended protocol configuration options	Extended protocol configuration options 9.11.4.6	O	TLV-E	4-65538
74	Port management information container	Port management information container 9.11.4.27	O	TLV-E	4-65538
66	IP header compression configuration	Header compression configuration 9.11.4.24	O	TLV	5-257
1F	Ethernet header compression configuration	Ethernet header compression configuration 9.11.4.28	O	TLV	3
70	Requested MBS container	Requested MBS container 9.11.4.30	O	TLV-E	8-65538
72	Service-level-AA container	Service-level-AA container 9.11.2.10	O	TLV-E	6-n

NOTE: It is possible for UEs compliant with version 15.2.1 or earlier versions of this specification to send the Mapped EPS bearer contexts IE with IEI of value "7F" for this message.

8.3.7.2 5GSM capability

This IE is included in the message:

1) for a PDN connection established when in S1 mode, after an inter-system change from S1 mode to N1 mode, if the UE is a UE operating in single-registration mode in a network supporting N26 interface, the UE has not previously successfully performed the UE-requested PDU session modification to provide this capability, and:

a) if the PDU session is of "IPv4", "IPv6", "IPv4v6" or "Ethernet" PDU session type, and the UE supports reflective QoS; or

b) if the PDU session is of "IPv6" or "IPv4v6" PDU session type, and the UE supports multi-homed IPv6 PDU session; or

2) if the UE needs to revoke the previously indicated support of reflective QoS.

8.3.7.3 5GSM cause

This IE is included in the message to indicate the reason for the deletion of one or more non-default QoS rules, QoS flow descriptions or mapped EPS bearer contexts.

8.3.7.4 Maximum number of supported packet filters

This IE shall be included in the message for a PDN connection established when in S1 mode, after an inter-system change from S1 mode to N1 mode, if the UE is a UE operating in single-registration mode in a network supporting N26 interface, the UE has not previously successfully performed the UE-requested PDU session modification to provide this capability, the PDU session type is "IPv4", "IPv6", "IPv4v6" or "Ethernet", and the UE can support more than 16 packet filters for this PDU session.

8.3.7.5 Always-on PDU session requested

This IE shall be included in the message for a PDN connection established when in S1 mode, after an inter-system change from S1 mode to N1 mode, if the UE is a UE operating in single-registration mode in a network supporting N26 interface, the UE has not previously successfully performed the UE-requested PDU session modification to provide this capability, and the UE requests the PDU session to be an always-on PDU session in the 5GS.

8.3.7.6 Integrity protection maximum data rate

This IE shall be included in the message for a PDN connection established when in S1 mode, after an inter-system change from S1 mode to N1 mode, if the UE is a UE operating in single-registration mode in a network supporting N26 interface, and the UE has not previously successfully performed the UE-requested PDU session modification to provide this capability.

8.3.7.7 Requested QoS rules

This IE is included in the message when the UE requests a specific QoS handling.

8.3.7.8 Requested QoS flow descriptions

This IE is included in the message when the UE requests a specific QoS flow descriptions.

8.3.7.9 Extended protocol configuration options

This IE is included in the message when the UE needs to transmit (protocol) data (e.g. configuration parameters, error codes or messages/events) to the network.

8.3.7.10 Mapped EPS bearer contexts

This IE is included when the UE requests to delete one or more mapped EPS bearer contexts.

8.3.7.11 Port management information container

This IE shall be included when the UE needs to convey a port management information container.

8.3.7.12 IP header compression configuration

This IE is included in the message:

a) if the UE wishes to re-negotiate IP header compression configuration associated to a PDU session and both the UE and the network supports Control plane CIoT 5GS optimization and IP header compression; or

b) to negotiate IP header compression configuration associated to a PDU session after an inter-system change from S1 mode to N1 mode when both the UE and the network support control plane CIoT 5GS optimization and IP header compression, and the UE is operating in single-registration mode in the network supporting N26 interface.

8.3.7.13 Ethernet header compression configuration

This IE is included in the message:

a) if the UE wishes to re-negotiate Ethernet header compression configuration associated to a PDU session and both the UE and the network support Control plane CIoT 5GS optimization and Ethernet header compression; or

b) to negotiate Ethernet header compression configuration associated to a PDU session after an inter-system change from S1 mode to N1 mode.

8.3.7.14 Requested MBS container

This IE is included in the message when the UE requests to join or leave one or more multicast MBS sessions that are associated with the PDU session.

8.3.7.15 Service-level-AA container

This IE shall be included in the message when the UE needs to modify an established PDU session for C2 communication.

8.3.8 PDU session modification reject

8.3.8.1 Message definition

The PDU SESSION MODIFICATION REJECT message is sent by the SMF to the UE to indicate rejection of the PDU SESSION MODIFICATION REQUEST. See table 8.3.8.1.1.

Message type: PDU SESSION MODIFICATION REJECT

Significance: dual

Direction: network to UE

Table 8.3.8.1.1: PDU SESSION MODIFICATION REJECT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	PDU SESSION MODIFICATION REJECT message identity	Message type 9.7	M	V	1
	5GSM cause	5GSM cause 9.11.4.2	M	V	1
37	Back-off timer value	GPRS timer 3 9.11.2.5	O	TLV	3
61	5GSM congestion re-attempt indicator	5GSM congestion re-attempt indicator 9.11.4.21	O	TLV	3
7B	Extended protocol configuration options	Extended protocol configuration options 9.11.4.6	O	TLV-E	4-65538
1D	Re-attempt indicator	Re-attempt indicator 9.11.4.17	O	TLV	3

8.3.8.2 Back-off timer value

The network may include this IE if the 5GSM cause is not #26 "insufficient resources", #37 "5GS QoS not accepted", #44 "Semantic errors in packet filter(s)", #45 "Syntactical error in packet filter(s)", #46 "out of LADN service area", #59 "unsupported 5QI value", #67 "insufficient resources for specific slice and DNN", #69 "insufficient resources for specific slice", #83 "Semantic error in the QoS operation", or #84 "Syntactical error in the QoS operation" to request a minimum time interval before procedure retry is allowed.

8.3.8.2A 5GSM congestion re-attempt indicator

8.3.8.3 Extended protocol configuration options

This IE is included in the message when the network needs to transmit (protocol) data (e.g. configuration parameters, error codes or messages/events) to the UE.

8.3.8.4 Re-attempt indicator

The network may include this IE only if it includes the Back-off timer value IE and the 5GSM cause value is not #26 "insufficient resources", #37 "5GS QoS not accepted", #44 "Semantic errors in packet filter(s)", #45 "Syntactical error in packet filter(s)", #46 "out of LADN service area", #59 "unsupported 5QI value", #67 "insufficient resources for specific slice and DNN", #69 "insufficient resources for specific slice", #83 "Semantic error in the QoS operation", or #84 "Syntactical error in the QoS operation".

8.3.9 PDU session modification command

8.3.9.1 Message definition

The PDU SESSION MODIFICATION COMMAND message is sent by the SMF to the UE to indicate a modification of a PDU session. See table 8.3.9.1.1

Message type: PDU SESSION MODIFICATION COMMAND

Significance: dual

Direction: network to UE

Table 8.3.9.1.1: PDU SESSION MODIFICATION COMMAND message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	PDU SESSION MODIFICATION COMMAND message identity	Message type 9.7	M	V	1
59	5GSM cause	5GSM cause 9.11.4.2	O	TV	2
2A	Session AMBR	Session-AMBR 9.11.4.14	O	TLV	8
56	RQ timer value	GPRS timer 9.11.2.3	O	TV	2
8-	Always-on PDU session indication	Always-on PDU session indication 9.11.4.3	O	TV	1
7A	Authorized QoS rules	QoS rules 9.11.4.13	O	TLV-E	7-65538
75	Mapped EPS bearer contexts	Mapped EPS bearer contexts 9.11.4.8	O	TLV-E	7-65538
79	Authorized QoS flow descriptions	QoS flow descriptions 9.11.4.12	O	TLV-E	6-65538
7B	Extended protocol configuration options	Extended protocol configuration options 9.11.4.6	O	TLV-E	4-65538
77	ATSSS container	ATSSS container 9.11.4.22	O	TLV-E	3-65538
66	IP header compression configuration	IP header compression configuration 9.11.4.24	O	TLV	5-257
74	Port management information container	Port management information container 9.11.4.27	O	TLV-E	4-65538
1E	Serving PLMN rate control	Serving PLMN rate control 9.11.4.20	O	TLV	4
1F	Ethernet header compression configuration	Ethernet header compression configuration 9.11.4.28	O	TLV	3
71	Received MBS container	Received MBS container 9.11.4.31	O	TLV-E	9-65538
72	Service-level-AA container	Service-level-AA container 9.11.2.10	O	TLV-E	6-n

NOTE: It is possible for networks compliant with version 15.2.1 or earlier versions of this specification to send the Mapped EPS bearer contexts IE with IEI of value "7F" for this message.

8.3.9.2 5GSM cause

This IE is included when the network performs the PDU session anchor relocation for SSC mode 3.

8.3.9.3 Session-AMBR

This IE is included when the session-AMBR of the PDU session is modified.

8.3.9.4 RQ timer value

This IE is included when the network needs to provide the RQ timer value.

8.3.9.5 Always-on PDU session indication

The network shall include this IE if the network decides to inform the UE whether the PDU session is an always-on PDU session.

8.3.9.6 Authorized QoS rules

This IE is included when the authorized QoS rules of the PDU session are modified.

8.3.9.7 Mapped EPS bearer contexts

This IE is included when interworking with EPS is supported for the PDU session and the mapped EPS bearer contexts is modified.

8.3.9.8 Authorized QoS flow descriptions

This IE is included when the authorized QoS flow descriptions of the PDU session are modified.

8.3.9.9 Extended protocol configuration options

This IE is included in the message when the network needs to transmit (protocol) data (e.g. configuration parameters, error codes or messages/events) to the UE.

8.3.9.10 Void

8.3.9.11 ATSSS container

The IE is included in the message when the network needs to indicate that the ATSSS parameters of the MA PDU session are modified.

8.3.9.12 IP header compression configuration

This IE is included in the message if the network wishes to re-negotiate IP header compression configuration associated to a PDU session and both the UE and the network support Control plane CIoT 5GS optimization and IP header compression.

8.3.9.13 Port management information container

This IE shall be included when the network needs to convey a port management information container.

8.3.9.14 Serving PLMN rate control

This IE shall be included when the network needs to indicate the maximum uplink control plane user data the UE is allowed to send per 6 minute interval.

8.3.9.15 Ethernet header compression configuration

This IE is included in the message if the network wishes to re-negotiate Ethernet header compression configuration associated to a PDU session and both the UE and the network support Control plane CIoT 5GS optimization and Ethernet header compression.

8.3.9.16 Received MBS container

The network shall include this IE if:

– the UE has requested to join or leave one or more multicast MBS sessions;

– the network wants to remove joined UE from one or more multicast MBS sessions; or

– the network wants to update the MBS service area of multicast MBS session that the UE has joined; or

– the network wants to update the MBS security information of multicast MBS session that the UE has joined.

8.3.9.17 Service-level-AA container

The SMF shall include the service-level-AA container IE if the service-level authentication and authorization procedure for re-authentication purpose is completed successfully by the external DN.

8.3.10 PDU session modification complete

8.3.10.1 Message definition

The PDU SESSION MODIFICATION COMPLETE message is sent by the UE to the SMF in response to the PDU SESSION MODIFICATION COMMAND message and indicates an acceptance of the PDU SESSION MODIFICATION COMMAND message. See table 8.3.10.1.1.

Message type: PDU SESSION MODIFICATION COMPLETE

Significance: dual

Direction: UE to network

Table 8.3.10.1.1: PDU SESSION MODIFICATION COMPLETE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	PDU SESSION MODIFICATION COMPLETE message identity	Message type 9.7	M	V	1
7B	Extended protocol configuration options	Extended protocol configuration options 9.11.4.6	O	TLV-E	4-65538
74	Port management information container	Port management information container 9.11.4.27	O	TLV-E	4-65538

NOTE: It is possible for UEs compliant with version 15.3.0 of this specification to include the 5GSM cause IE with IEI 59 in the PDU SESSION MODIFICATION COMPLETE message, and therefore the IEI 59 cannot be used for other optional IEs other than the 5GSM cause IE for future extensions of the PDU SESSION MODIFICATION COMPLETE message.

8.3.10.2 Extended protocol configuration options

This IE is included in the message when the UE needs to transmit (protocol) data (e.g. configuration parameters, error codes or messages/events) to the network.

8.3.10.3 Port management information container

This IE shall be included when the UE needs to convey a port management information container.

8.3.11 PDU session modification command reject

8.3.11.1 Message definition

The PDU SESSION MODIFICATION COMMAND REJECT message is sent by the UE to the SMF to indicate rejection of the PDU SESSION MODIFICATION COMMAND message. See table 8.3.11.1.1.

Message type: PDU SESSION MODIFICATION COMMAND REJECT

Significance: dual

Direction: UE to network

Table 8.3.11.1.1: PDU SESSION MODIFICATION COMMAND REJECT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	PDU SESSION MODIFICATION COMMAND REJECT message identity	Message type 9.7	M	V	1
	5GSM cause	5GSM cause 9.11.4.2	M	V	1
7B	Extended protocol configuration options	Extended protocol configuration options 9.11.4.6	O	TLV-E	4-65538

8.3.11.2 Extended protocol configuration options

This IE is included in the message when the UE needs to transmit (protocol) data (e.g. configuration parameters, error codes or messages/events) to the network.

8.3.12 PDU session release request

8.3.12.1 Message definition

The PDU SESSION RELEASE REQUEST message is sent by the UE to the SMF to request a release of a PDU session. See table 8.3.12.1.1.

Message type: PDU SESSION RELEASE REQUEST

Significance: dual

Direction: UE to network

Table 8.3.12.1.1: PDU SESSION RELEASE REQUEST message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	PDU SESSION RELEASE REQUEST message identity	Message type 9.7	M	V	1
59	5GSM cause	5GSM cause 9.11.4.2	O	TV	2
7B	Extended protocol configuration options	Extended protocol configuration options 9.11.4.6	O	TLV-E	4-65538

8.3.12.2 5GSM cause

This IE is included in the message to indicate the reason for releasing the PDU session.

8.3.12.3 Extended protocol configuration options

This IE is included in the message when the UE needs to transmit (protocol) data (e.g. configuration parameters, error codes or messages/events) to the network.

8.3.13 PDU session release reject

8.3.13.1 Message definition

The PDU SESSION RELEASE REJECT message is sent by the SMF to the UE to indicate rejection of request a release of a PDU session. See table 8.3.13.1.1.

Message type: PDU SESSION RELEASE REJECT

Significance: dual

Direction: network to UE

Table 8.3.13.1.1: PDU SESSION RELEASE REJECT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	PDU SESSION RELEASE REJECT message identity	Message type 9.7	M	V	1
	5GSM cause	5GSM cause 9.11.4.2	M	V	1
7B	Extended protocol configuration options	Extended protocol configuration options 9.11.4.6	O	TLV-E	4-65538

8.3.13.2 Extended protocol configuration options

This IE is included in the message when the network needs to transmit (protocol) data (e.g. configuration parameters, error codes or messages/events) to the UE.

8.3.14 PDU session release command

8.3.14.1 Message definition

The PDU SESSION RELEASE COMMAND message is sent by the SMF to the UE to indicate a release of a PDU session. See table 8.3.14.1.1.

Message type: PDU SESSION RELEASE COMMAND

Significance: dual

Direction: network to UE

Table 8.3.14.1.1: PDU SESSION RELEASE COMMAND message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	PDU SESSION RELEASE COMMAND message identity	Message type 9.7	M	V	1
	5GSM cause	5GSM cause 9.11.4.2	M	V	1
37	Back-off timer value	GPRS timer 3 9.11.2.5	O	TLV	3
78	EAP message	EAP message 9.11.2.2	O	TLV-E	7-1503
61	5GSM congestion re-attempt indicator	5GSM congestion re-attempt indicator 9.11.4.21	O	TLV	3
7B	Extended protocol configuration options	Extended protocol configuration options 9.11.4.6	O	TLV-E	4-65538
D-	Access type	Access type 9.11.2.1A	O	TV	1
72	Service-level-AA container	Service-level-AA container 9.11.2.10	O	TLV-E	6-n

8.3.14.2 Back-off timer value

The network may include this IE to request a minimum time interval before procedure retry is allowed.

8.3.14.3 EAP message

This IE is included when the external DN performs re-authentication and re-authorization of the UE using EAP and it completes unsuccessfully.

8.3.14.4 Extended protocol configuration options

This IE is included in the message when the network wants to transmit (protocol) data (e.g. configuration parameters, error codes or messages/events) to the UE.

8.3.14.5 5GSM congestion re-attempt indicator

8.3.14.6 Access type

This IE is included in the message when the network releases user-plane reources of an MA PDU session specifically over either 3GPP access or non-3GPP access.

8.3.14.7 Service-level-AA container

The SMF shall include the service-level-AA container IE if the service-level authentication and authorization procedure for re-authentication purpose is completed unsuccessfully by the external DN.

8.3.15 PDU session release complete

8.3.15.1 Message definition

The PDU SESSION RELEASE COMPLETE message is sent by the UE to the SMF in response to the PDU SESSION RELEASE COMMAND message and indicates an acceptance of a release of the PDU session. See table 8.3.15.1.1.

Message type: PDU SESSION RELEASE COMPLETE

Significance: dual

Direction: UE to network

Table 8.3.15.1.1: PDU SESSION RELEASE COMPLETE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	PDU SESSION RELEASE COMPLETE message identity	Message type 9.7	M	V	1
59	5GSM cause	5GSM cause 9.11.4.2	O	TV	2
7B	Extended protocol configuration options	Extended protocol configuration options 9.11.4.6	O	TLV-E	4-65538

8.3.15.2 5GSM cause

This IE is included in the message when the UE needs to indicate to the network that an error encountered with a mandatory information element in the PDU SESSION RELEASE COMMAND message.

8.3.15.3 Extended protocol configuration options

This IE is included in the message when the UE needs to transmit (protocol) data (e.g. configuration parameters, error codes or messages/events) to the network.

8.3.16 5GSM status

8.3.16.1 Message definition

The 5GSM STATUS message is sent by the SMF or the UE to pass information on the status of the indicated PDU session and report certain error conditions. See table 8.3.16.1.1.

Message type: 5GSM STATUS

Significance: dual

Direction: both

Table 8.3.16.1.1: 5GSM STATUS message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	5GSM STATUS message identity	Message type 9.7	M	V	1
	5GSM cause	5GSM cause 9.11.4.2	M	V	1

8.3.17 Service-level authentication command

8.3.17.1 Message definition

The SERVICE-LEVEL AUTHENTICATION COMMAND message is sent by the SMF to the UE for service-level authentication and authorization procedure. See table 8.3.17.1.1.

Message type: SERVICE-LEVEL AUTHENTICATION COMMAND

Significance: dual

Direction: network to UE

Table 8.3.17.1.1: SERVICE-LEVEL AUTHENTICATION COMMAND message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	SERVICE-LEVEL AUTHENTICATION COMMAND message identity	Message type 9.7	M	V	1
	Service-level-AA container	Service-level-AA container 9.11.2.10	M	LV-E	5-n

8.3.18 Service-level authentication complete

8.3.18.1 Message definition

The SERVICE-LEVEL AUTHENTICATION COMPLETE message is sent by the UE to the SMF in response to the SERVICE-LEVEL AUTHENTICATION COMMAND message and indicates acceptance of the SERVICE-LEVEL AUTHENTICATION COMMAND message. See table 8.3.18.1.1.

Message type: SERVICE-LEVEL AUTHENTICATION COMPLETE

Significance: dual

Direction: UE to network

Table 8.3.18.1.1: SERVICE-LEVEL AUTHENTICATION COMPLETE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	SERVICE-LEVEL AUTHENTICATION COMPLETE message identity	Message type 9.7	M	V	1
	Service-level-AA container	Service-level-AA container 9.11.2.10	M	LV-E	5-n

8.3.19 Remote UE report

8.3.19.1 Message definition

The REMOTE UE REPORT message is sent by the UE to the network to report connection or disconnection of 5G ProSe remote UE(s). See table 8.3.19.1.

Message type: REMOTE UE REPORT

Significance: dual

Direction: UE to network

Table 8.3.19.1: REMOTE UE REPORT message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	Remote UE report message identity	Message type 9.7	M	V	1
76	Remote UE context connected	Remote UE context list 9.11.4.29	O	TLV-E	16-65538
70	Remote UE context disconnected	Remote UE context list 9.11.4.29	O	TLV-E	16-65538

8.3.19.2 Remote UE context connected

This IE is included in the message by the UE acting as a 5G ProSe layer-3 UE-to-network UE relay to provide the network with newly connected 5G ProSe remote UE information as specified in 3GPP TS 23.304 [6E].

8.3.19.3 Remote UE context disconnected

This IE is included in the message by the UE acting as a 5G ProSe layer-3 UE-to-network UE relay to provide the network with disconnected 5G ProSe remote UE information as specified in 3GPP TS 23.304 [6E].

8.3.20 Remote UE report response

8.3.20.1 Message definition

The REMOTE UE REPORT RESPONSE message is sent by the network to the UE to acknowledge receipt of a remote UE report message. See table 8.3.20.1.

Message type: REMOTE UE REPORT RESPONSE

Significance: dual

Direction: network to UE

Table 8.3.20.1: REMOTE UE REPORT RESPONSE message content

IEI	Information Element	Type/Reference	Presence	Format	Length
	Extended protocol discriminator	Extended protocol discriminator 9.2	M	V	1
	PDU session ID	PDU session identity 9.4	M	V	1
	PTI	Procedure transaction identity 9.6	M	V	1
	Remote UE report response message identity	Message type 9.7	M	V	1