Content for TS 24.501 Word version: 18.1.0

1… 3… 4… 4.4… 4.4.3… 4.5… 4.5.3… 4.6… 4.7… 4.9… 4.15… 5… 5.2… 5.3… 5.3.2… 5.3.7… 5.3.19… 5.4… 5.4.1.3… 5.4.2… 5.4.4… 5.4.5… 5.4.6… 5.5… 5.5.1.2.4 5.5.1.2.5… 5.5.1.3… 5.5.1.3.4 5.5.1.3.5… 5.5.2… 5.6… 5.6.2… 6… 6.1.4… 6.2… 6.3… 6.3.2… 6.3.3… 6.4… 6.4.1.4… 6.4.2… 6.5… 7… 8… 8.2.9… 8.3… 9… 9.11.2… 9.11.2.10… 9.11.3… 9.11.3.4… 9.11.3.8… 9.11.3.14… 9.11.3.18C… 9.11.3.29… 9.11.3.33… 9.11.3.39… 9.11.3.45… 9.11.3.50… 9.11.3.53A… 9.11.3.68… 9.11.3.75… 9.11.4… 9.11.4.10… 9.11.4.13… 9.11.4.16… 9.11.4.30… 9.12 10… A… B… C… D… D.6… D.6.3…

8.3 5GS session management messages 8.3.1 PDU session establishment request 8.3.2 PDU session establishment accept 8.3.3 PDU session establishment reject 8.3.4 PDU session authentication command 8.3.5 PDU session authentication complete 8.3.6 PDU session authentication result 8.3.7 PDU session modification request 8.3.8 PDU session modification reject 8.3.9 PDU session modification command 8.3.10 PDU session modification complete 8.3.11 PDU session modification command reject 8.3.12 PDU session release request 8.3.13 PDU session release reject 8.3.14 PDU session release command 8.3.15 PDU session release complete 8.3.16 5GSM status 8.3.17 Service-level authentication command 8.3.18 Service-level authentication complete 8.3.19 Remote UE report 8.3.20 Remote UE report response
...

8.3 5GS session management messages p. 699

8.3.1 PDU session establishment request p. 699

8.3.1.1 Message definition p. 699

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 p. 700

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

8.3.1.3 SSC mode p. 701

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 p. 701

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 p. 701

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 p. 701

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 p. 701

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 p. 701

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 |R16| p. 701

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 |R16| p. 701

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 |R16| p. 701

This IE shall be included in the message if:

the UE supports transfer of port management information containers; and
the UE-DS-TT residence time is available at the UE.

8.3.1.13 Port management information container |R16| p. 702

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 |R16| p. 702

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 |R16| p. 702

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

8.3.1.16 Service-level-AA container |R17| p. 702

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 |R17| p. 702

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 |R17| p. 702

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

8.3.1.19 RSN |R17| p. 702

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

8.3.2 PDU session establishment accept p. 702

8.3.2.1 Message definition p. 702

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 p. 703

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 p. 704

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

8.3.2.4 RQ timer value p. 704

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

8.3.2.5 S-NSSAI p. 704

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 p. 704

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 p. 704

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

8.3.2.8 EAP message p. 704

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 p. 704

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

8.3.2.10 Extended protocol configuration options p. 704

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 p. 704

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 |R16| p. 704

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 |R16| p. 704

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 |R16| p. 704

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 |R16| p. 705

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 |R16| p. 705

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 |R16| p. 705

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 |R17| p. 705

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 |R17| p. 705

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 p. 705

8.3.3.1 Message definition p. 705

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 p. 706

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 p. 706

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 p. 706

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 |R16| p. 706

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 p. 706

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 p. 707

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 |R17| p. 707

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 p. 707

8.3.4.1 Message definition p. 707

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 p. 707

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.

8.3.4.3 Void

8.3.5 PDU session authentication complete p. 708

8.3.5.1 Message definition p. 708

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 p. 708

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 p. 708

8.3.6.1 Message definition p. 708

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 p. 709

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 p. 709

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 p. 709

8.3.7.1 Message definition p. 709

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

8.3.7.2 5GSM capability p. 710

This IE is 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:
1. if the PDU session is of "IPv4", "IPv6", "IPv4v6" or "Ethernet" PDU session type, and the UE supports reflective QoS; or
2. if the PDU session is of "IPv6" or "IPv4v6" PDU session type, and the UE supports multi-homed IPv6 PDU session; or
if the UE needs to revoke the previously indicated support of reflective QoS.

8.3.7.3 5GSM cause p. 711

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 p. 711

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 p. 711

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 p. 711

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 p. 711

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

8.3.7.8 Requested QoS flow descriptions p. 711

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

8.3.7.9 Extended protocol configuration options p. 711

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 p. 711

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 |R16| p. 711

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

8.3.7.12 IP header compression configuration |R16| p. 711

This IE is included in the message:

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
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 |R16| p. 712

This IE is included in the message:

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
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 |R17| p. 712

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 |R17| p. 712

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 p. 712

8.3.8.1 Message definition p. 712

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 p. 713

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 |R16| p. 713

8.3.8.3 Extended protocol configuration options p. 713

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 p. 713

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 p. 713

8.3.9.1 Message definition p. 713

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

8.3.9.2 5GSM cause p. 714

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

8.3.9.3 Session-AMBR p. 714

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

8.3.9.4 RQ timer value p. 714

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

8.3.9.5 Always-on PDU session indication p. 715

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 p. 715

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

8.3.9.7 Mapped EPS bearer contexts p. 715

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 p. 715

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

8.3.9.9 Extended protocol configuration options p. 715

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 |R16| p. 715

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 |R16| p. 715

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 |R16| p. 715

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

8.3.9.14 Serving PLMN rate control |R16| p. 715

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 |R16| p. 715

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 |R17| p. 715

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 |R17| p. 716

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 p. 716

8.3.10.1 Message definition p. 716

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

8.3.10.2 Extended protocol configuration options p. 716

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 |R16| p. 716

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

8.3.11 PDU session modification command reject p. 716

8.3.11.1 Message definition p. 716

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 p. 717

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 p. 717

8.3.12.1 Message definition p. 717

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 p. 718

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

8.3.12.3 Extended protocol configuration options p. 718

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 p. 718

8.3.13.1 Message definition p. 718

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 p. 718

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 p. 718

8.3.14.1 Message definition p. 718

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 p. 719

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

8.3.14.3 EAP message p. 719

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 p. 719

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 p. 719

8.3.14.6 Access type |R16| p. 719

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 |R17| p. 719

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 p. 720

8.3.15.1 Message definition p. 720

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 p. 720

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 p. 720

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 p. 720

8.3.16.1 Message definition p. 720

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

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 |R17| p. 721

8.3.17.1 Message definition p. 721

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

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 |R17| p. 721

8.3.18.1 Message definition p. 721

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

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 |R17| p. 722

8.3.19.1 Message definition p. 722

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 p. 722

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 TS 23.304.

8.3.19.3 Remote UE context disconnected p. 722

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 TS 23.304.

8.3.20 Remote UE report response |R17| p. 723

8.3.20.1 Message definition p. 723

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

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