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Content for  TR 24.890  Word version:  16.0.0

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1  Scopep. 20

The present document discusses and describes the CT1 aspects of the 5G System phase 1. In particular, these CT1 aspects include the non-access-stratum (NAS) functions to be performed by the user equipment (UE) in idle mode and the NAS signalling procedures between the UE and the 5G System (5GS) phase 1.
The present document also considers the requirements on the NAS between the UE and the core network which arise from specific services such as public warning system (PWS), SMS over NAS, emergency services, location services (LCS), multimedia priority services (MPS), and also network functions such as access control, security, QoS, IMS, network sharing, charging, congestion and overload control. In addition, the document considers the case of network slicing as well as interworking with E-UTRAN connected to EPC.
The present document is intended as a holding place for CT1 5GS material until it stabilises sufficiently to be moved to appropriate 3GPP technical specifications.
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2  Referencesp. 20

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 22.011: "Service accessibility".
[3]
TS 22.261: "Service requirements for the 5G system; Stage 1".
[4]
TS 22.268: "Public Warning System (PWS) Requirements".
[5]
TS 23.003: "Numbering, addressing and identification".
[6]
TS 23.041: "Technical realization of Cell Broadcast Service (CBS)".
[7]
TS 23.122: "Non-Access-Stratum functions related to Mobile Station (MS) in idle mode".
[8]
TS 23.167: "IP Multimedia Subsystem (IMS) emergency sessions".
[9]
TS 23.501: "System Architecture for the 5G System; Stage 2".
[10]
TS 23.502: "Procedures for the 5G System; Stage 2".
[11]
TS 24.007: "Mobile radio interface signalling layer 3; General aspects".
[12]
TS 24.008: "Mobile Radio Interface Layer 3 specification; Core Network Protocols; Stage 3".
[13]
TS 24.229: "IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".
[14]
TS 24.250: "Protocol for Reliable Data Service between UE and SCEF; Stage 3".
[15]
TS 24.301: "Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3".
[16]
TS 24.302: "Access to the 3GPP Evolved Packet Core (EPC) via non-3GPP access networks; Stage 3"
[17]
TS 24.501: "Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3".
[18]
TS 24.502: "Access to the 3GPP 5G System (5GS) via non-3GPP access networks; Stage 3"
[19]
TS 24.568: "WLAN connectivity for 5GS Management Object (MO)"
→ to date, withdrawn by 3GPP
[20]
TS 28.530: "Telecommunication management; Management of network slicing in mobile networks; Concepts, use cases and requirements".
[21]
TS 28.531: "Provisioning of network slicing for 5G networks and services".
[22]
TS 29.168: "Cell Broadcast Centre interfaces with the Evolved Packet Core".
[23]
TR 32.899: "Charging management; Study on charging aspects of 5G system architecture phase 1".
[24]
TS 33.501: "Security architecture and procedures for 5G System".
[25]
TS 36.355: "Evolved Universal Terrestrial Radio Access (E-UTRA); LTE Positioning Protocol (LPP)".
[26]
TS 38.300: "NR; NR and NG-RAN Overall Description; Stage 2".
[27]
TS 38.304: "New Generation Radio Access Network; User Equipment (UE) procedures in idle mode".
[28]
TS 38.413: "NG Radio Access Network (NG-RAN); NG Application Protocol (NGAP)".
[29]
RFC 3736:  "Stateless DHCP Service for IPv6".
[30]
RFC 3748:  "Extensible Authentication Protocol (EAP)".
[31]
RFC 4191:  "Default Router Preferences and More-Specific Routes".
[32]
RFC 4282:  "The Network Access Identifier".
[33]
RFC 4862:  "IPv6 Stateless Address Autoconfiguration".
[34]
RFC 4960:  "Stream Control Transmission Protocol".
[35]
RFC 5448:  "Improved Extensible Authentication Protocol Method for 3rd Generation Authentication and Key Agreement (EAP-AKA')".
[36]
RFC 7296:  "Internet Key Exchange Protocol Version 2 (IKEv2)".
[37]
TS 31.111: "Universal Subscriber Identity Module (USIM) Application Toolkit (USAT)".
[38]
TS 31.115: "Secured packet structure for (Universal) Subscriber Identity Module (U)SIM Toolkit applications".
[39]
TS 31.116: "Remote APDU Structure for (U)SIM Toolkit applications".
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3  Definitions and abbreviationsp. 22

3.1  Definitionsp. 22

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
5GMM-IDLE mode:
In this specification, if the term is used standalone, a UE in 5GMM-IDLE mode means the UE can be either in 5GMM-IDLE mode over 3GPP access or in 5GMM-IDLE mode over non-3GPP access.
5GMM-CONNECTED mode:
In this specification, if the term is used standalone, a UE in 5GMM-CONNECTED mode means the UE can be either in 5GMM-CONNECTED mode over 3GPP access or in 5GMM-CONNECTED mode over non-3GPP access.
5GMM-IDLE mode over 3GPP access:
A UE is in 5GMM-IDLE mode over 3GPP access when no N1 NAS signalling connection between the UE and network over 3GPP access exists. The term 5GMM-IDLE mode over 3GPP access used in the present document corresponds to the term CM-IDLE state for 3GPP access used in TS 23.501.
5GMM-CONNECTED mode over 3GPP access:
A UE is in 5GMM-CONNECTED mode over 3GPP access when a N1 NAS signalling connection between the UE and network over 3GPP access exists. The term 5GMM-CONNECTED mode over 3GPP access used in the present document corresponds to the term CM-CONNECTED state for 3GPP access used in TS 23.501.
5GMM-IDLE mode over non-3GPP access:
A UE is in 5GMM-IDLE mode over non-3GPP access no N1 NAS signalling connection between the UE and network over non-3GPP access exists. The term 5GMM-IDLE mode over non-3GPP access used in the present document corresponds to the term CM-IDLE state for non-3GPP access used in TS 23.501.
5GMM-CONNECTED mode over non-3GPP access:
A UE is in 5GMM-CONNECTED mode over non-3GPP access when it has N1 NAS signalling connection between the UE and network over non-3GPP access exists. The term 5GMM-CONNECTED mode over non-3GPP access used in the present document corresponds to the term CM-CONNECTED state for non-3GPP access used in TS 23.501.
Access stratum connection:
A peer to peer access stratum connection between either the UE and the NG-RAN for 3GPP access or the UE and the N3IWF for non-3GPP access. The access stratum connection for 3GPP access corresponds to an RRC connection via the Uu reference point. The creation of the access stratum connection for non-3GPP access corresponds to the completion of the IKE_SA_INIT exchange (see RFC 7296) via the NWu reference point.
DNN based congestion control:
Type of congestion control at session management level that is applied to reject session management requests from UEs or release PDU sessions when the associated DNN is congested.
EAP-5G:
A vendor-specific EAP method which is used to encapsulate NAS messages between the UE and the N3IWF.
General NAS level congestion control:
Type of congestion control at mobility management level that is applied at a general overload or congestion situation in the network, e.g. lack of processing resources.
Last visited registered TAI:
A TAI which is contained in the registration area that the UE registered to the network and which identifies the tracking area last visited by the UE.
N1 mode:
A mode of a UE allowing access to the 5G core network via the 5G access network.
N1 NAS signalling connection:
A peer to peer N1 mode connection between UE and AMF. An N1 NAS signalling connection is either the concatenation of an RRC connection via the Uu reference point and an NG connection via the N2 reference point for 3GPP access, or the concatenation of an IPsec tunnel via the NWu reference point and an NG connection via the N2 reference point for non-3GPP access.
PDU session for LADN:
A PDU session with a DNN associated with a LADN.
S-NSSAI based congestion control:
Type of congestion control at session management level that is applied to reject session management requests from UEs for a particular S-NSSAI.
Selected core network type information:
A type of core network (EPC or 5GCN) selected by the UE NAS layer in case of an E-UTRA cell connected to both EPC and 5GCN.
For the purposes of the present document, the following terms and definitions given in TS 23.501 apply:
5G access network
5G core network
5G QoS flow
5G QoS identifier
5G-GUTI
5G System
5G-S-TMSI
Allowed area
Allowed NSSAI
AMF region
AMF set
Configured NSSAI
Local area data network
Network slice
NG-RAN
Non-allowed area
PDU session
PDU session type
PEI
Requested NSSAI
SUPI
For the purposes of the present document, the following terms and definitions given in TS 24.301 apply:
UE configured to use AC11 - 15 in selected PLMN
For the purposes of the present document, the following terms and definitions given in TS 33.501 apply:
5G security context
5G NAS security context
Current 5G security context
Full native 5G security context
Native 5G security context
For the purposes of the present document, the following terms and definitions given in TS 38.413 apply:
NG connection
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3.2  Abbreviationsp. 23

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply.
An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
4G-GUTI
4G-Globally Unique Temporary Identifier
5GCN
5G Core Network
5G-GUTI
5G-Globally Unique Temporary Identifier
5GMM
5GS Mobility Management
5GS
5G System
5GSM
5GS Session Management
5G-S-TMSI
5G S-Temporary Mobile Subscription Identifier
5G-TMSI
5G Temporary Mobile Subscription Identifier
5QI
5G QoS Identifier
AKA
Authentication and Key Agreement
AMF
Access and Mobility Management Function
DL
Downlink
DN
Data Network
DNN
Data Network Name
E-UTRA
Evolved Universal Terrestrial Radio Access
E-UTRAN
Evolved Universal Terrestrial Radio Access Network
EAP
Extensible Authentication Protocol
EAP-AKA'
Improved Extensible Authentication Protocol method for 3rd generation Authentication and Key Agreement
EPD
Extended Protocol Discriminator
EMM
EPS Mobility Management
EPC
Evolved Packet Core Network
EPS
Evolved Packet System
ESM
EPS Session Management
GFBR
Guaranteed Flow Bit Rate
GUAMI
Globally Unique AMF Identifier
HRPD
High Rate Packet Data
LADN
Local Area Data Network
LMF
Location Management Function
LPP
LTE Positioning Protocol
MCS
Mission Critical Service
MFBR
Maximum Flow Bit Rate
MICO
Mobile Initiated Connection Only
N3IWF
Non-3GPP Inter-Working Function
NAI
Network Access Identifier
NR
New Radio
NRAS
New Radio Access Stratum
ngKSI
Key Set Identifier for Next Generation Radio Access Network
NSSAI
Network Slice Selection Assistance Information
NSSP
Network Slice Selection Policy
QFI
QoS Flow Identifier
QoS
Quality of Service
QRI
QoS Rule Identifier
RQA
Reflective QoS Attribute
RQI
Reflective QoS Indication
(R)AN
(Radio) Access Network
S-NSSAI
Single NSSAI
SA
Security Association
SNN
Serving Network Name
SMF
Session Management Function
UL
Uplink
TA
Tracking Area
TAC
Tracking Area Code
TAI
Tracking Area Identity
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