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
A set of UEs using private communication for 5G LAN-type service.
5G Access Network:
An access network comprising a NG-RAN and/or non-3GPP AN connecting to a 5G Core Network.
5G Core Network:
The core network specified in the present document. It connects to a 5G Access Network.
5G LAN-Type Service:
A service over the 5G system offering private communication using IP and/or non-IP type communications.
5G LAN-Virtual Network:
A virtual network over the 5G system capable of supporting 5G LAN-type service.
5G QoS Flow:
The finest granularity for QoS forwarding treatment in the 5G System. All traffic mapped to the same 5G QoS Flow receive the same forwarding treatment (e.g. scheduling policy, queue management policy, rate shaping policy, RLC configuration, etc.). Providing different QoS forwarding treatment requires separate 5G QoS Flow.
5G QoS Identifier:
A scalar that is used as a reference to a specific QoS forwarding behaviour (e.g. packet loss rate, packet delay budget) to be provided to a 5G QoS Flow. This may be implemented in the access network by the 5QI referencing node specific parameters that control the QoS forwarding treatment (e.g. scheduling weights, admission thresholds, queue management thresholds, link layer protocol configuration, etc.).
3GPP system consisting of 5G Access Network (AN), 5G Core Network and UE.
The 5G-BRG is a 5G-RG defined in BBF.
The 5G-CRG is a 5G-RG specified in DOCSIS MULPI [89
A 5G-RG is a RG capable of connecting to 5GC playing the role of a UE with regard to the 5G core. It supports secure element and exchanges N1 signalling with 5GC. The 5G-RG can be either a 5G-BRG or 5G-CRG.
Access Traffic Steering:
The procedure that selects an access network for a new data flow and transfers the traffic of this data flow over the selected access network. Access traffic steering is applicable between one 3GPP access and one non-3GPP access.
Access Traffic Switching:
The procedure that moves all traffic of an ongoing data flow from one access network to another access network in a way that maintains the continuity of the data flow. Access traffic switching is applicable between one 3GPP access and one non-3GPP access.
Access Traffic Splitting:
The procedure that splits the traffic of a data flow across multiple access networks. When traffic splitting is applied to a data flow, some traffic of the data flow is transferred via one access and some other traffic of the same data flow is transferred via another access. Access traffic splitting is applicable between one 3GPP access and one non-3GPP access.
NSSAI provided by the Serving PLMN during e.g. a Registration procedure, indicating the S-NSSAIs values the UE could use in the Serving PLMN for the current Registration Area.
Area where the UE is allowed to initiate communication as specified in clause 188.8.131.52
An AMF Region consists of one or multiple AMF Sets.
An AMF Set consists of some AMFs that serve a given area and Network Slice(s). AMF Set is unique within an AMF Region and it comprises of AMFs that support the same Network Slice(s). Multiple AMF Sets may be defined per AMF Region. The AMF instances in the same AMF Set may be geographically distributed but have access to the same context data.
An identifier that can be mapped to a specific application traffic detection rule.
AUSF Group ID:
This refers to one or more AUSF instances managing a specific set of SUPIs. An AUSF Group consists of one or multiple AUSF Sets.
Information included by a NF service producer to a NF service consumer in request responses or notifications to convey the scope within which selection/reselection of target NF/NF Services may be performed, or information included by the NF service consumer in requests or subscriptions to convey the scope within which selection/reselection of notification targets or the selection of other service(s) that the NF consumer produces for the same data context may be performed. See clause 184.108.40.206
NSSAI provisioned in the UE applicable to one or more PLMNs.
CHF Group ID:
This refers to one or more CHF instances managing a specific set of SUPIs.
This refers to delegating the discovery and associated selection of NF instances or NF service instances to an SCP.
This refers to the communication between NFs or NF services without using an SCP.
DN Access Identifier (DNAI):
Identifier of a user plane access to one or more DN(s) where applications are deployed.
A UE is considered Emergency Registered over an Access Type in a PLMN when registered for emergency services only over this Access Type in this PLMN.
An address in the format of an IP address or FQDN, which is used to determine the host/authority part of the target URI. This Target URI is used to access an NF service (i.e. to invoke service operations) of an NF service producer or for notifications to an NF service consumer.
Expected UE Behaviour:
Fixed Network Residential Gateway:
Set of parameters provisioned by an external party to 5G network functions on the foreseen or expected UE behaviour, see clause 5.20
A Fixed Network RG (FN-RG) is a RG that it does not support N1 signalling and it is not 5GC capable.
Fixed Network Broadband Residential Gateway:
Fixed Network Cable Residential Gateway:
A Fixed Network RG (FN-BRG) is a FN-RG specified in BBF TR 124 [90
A Fixed Network Cable RG (FN-CRG) is a FN-RG with cable modem specified in DOCSIS MULPI [89
GBR QoS Flow:
An area where the UE is not allowed to initiate communication as specified in clause 220.127.116.11
A QoS Flow using the GBR resource type or the Delay-critical GBR resource type and requiring guaranteed flow bit rate.
This is a NG-RAN node that supports Integrated access and backhaul (IAB) feature and provides connection to the core network to IAB-nodes. It supports the CU function of the CU/DU architecture for IAB defined in TS 38.401
A relay node that supports wireless in-band and out-of-band relaying of NR access traffic via NR Uu backhaul links. It supports the UE function and the DU function of the CU/DU architecture for IAB defined in TS 38.401
This refers to the communication between NFs or NF services via an SCP.
Intermediate SMF (I-SMF):
UE registration in RM-DEREGISTERED state as specified in clause 5.3.2
An SMF that is inserted to support a PDU session as the UE is located in an area which cannot be controlled by the original SMF because the UPF(s) belong to a different SMF Service Area.
Local Area Data Network:
a DN that is accessible by the UE only in specific locations, that provides connectivity to a specific DNN, and whose availability is provided to the UE.
Local Break Out (LBO):
Roaming scenario for a PDU Session where the PDU Session Anchor and its controlling SMF are located in the serving PLMN (VPLMN).
a 3GPP RAT type Identifier used in the Core Network only, which is a sub-type of E-UTRA RAT type, and defined to identify in the Core Network the E-UTRA when used by a UE indicating Category M.
MA PDU Session:
A PDU Session that provides a PDU connectivity service, which can use one access network at a time, or simultaneously one 3GPP access network and one non-3GPP access network.
Mobility Registration Update:
Network concept of determining within the AMF the UE mobility parameters as specified in clause 18.104.22.168
UE re-registration when entering new TA outside the TAI List as specified in clause 5.3.2
A UE having a USIM with MPS subscription.
NB-IoT UE Priority:
Numerical value used by the NG-RAN to prioritise between different UEs accessing via NB-IoT.
NGAP UE association:
The logical per UE association between a 5G-AN node and an AMF.
The binding between a NGAP UE association and a specific TNL association for a given UE.
A 3GPP adopted or 3GPP defined processing function in a network, which has defined functional behaviour and 3GPP defined interfaces.
A network function can be implemented either as a network element on a dedicated hardware, as a software instance running on a dedicated hardware, or as a virtualised function instantiated on an appropriate platform, e.g. on a cloud infrastructure.
Information identifying a domain. Used by the UPF for traffic detection and routing.
A logical network that provides specific network capabilities and network characteristics.
Network Slice instance:
A set of Network Function instances and the required resources (e.g. compute, storage and networking resources) which form a deployed Network Slice.
Non-GBR QoS Flow:
A QoS Flow using the Non-GBR resource type and not requiring guaranteed flow bit rate.
an identifier for identifying the Core Network part of a Network Slice instance when multiple Network Slice instances of the same Network Slice are deployed, and there is a need to differentiate between them in the 5GC.
an identifiable instance of the NF.
a functionality exposed by a NF through a service based interface and consumed by other authorized NFs.
NF service instance:
an identifiable instance of the NF service.
NF service operation:
An elementary unit a NF service is composed of.
NF Service Set:
A group of interchangeable NF service instances of the same service type within an NF instance. The NF service instances in the same NF Service Set have access to the same context data.
A group of interchangeable NF instances of the same type, supporting the same services and the same Network Slice(s). The NF instances in the same NF Set may be geographically distributed but have access to the same context data.
A radio access network that supports one or more of the following options with the common characteristics that it connects to 5GC:
Standalone New Radio.
New Radio is the anchor with E-UTRA extensions.
E-UTRA is the anchor with New Radio extensions.
Non-Seamless Non-3GPP offload:
Area where the UE is allowed to initiate Registration procedure but no other communication as specified in clause 22.214.171.124
The offload of user plane traffic via non-3GPP access without traversing either N3IWF/TNGF or UPF.
PCF Group ID:
This refers to one or more PCF instances managing a specific set of SUPIs. A PCF Group consists of one or multiple PCF Sets.
NSSAI provided by the Serving PLMN during a Registration procedure, indicating the S-NSSAI(s) for which the network slice-specific authentication and authorization procedure is pending.
PDU Connectivity Service:
A service that provides exchange of PDUs between a UE and a Data Network.
Association between the UE and a Data Network that provides a PDU connectivity service.
PDU Session Type:
The type of PDU Session which can be IPv4, IPv6, IPv4v6, Ethernet or Unstructured.
Periodic Registration Update:
Public network integrated NPN:
UE re-registration at expiry of periodic registration timer as specified in clause 5.3.2
A non-public network deployed with the support of a PLMN.
(Radio) Access Network:
See 5G Access Network.
Identifies a the transmission technology used in the access network for both 3GPP accesses and non-3GPP Accesses, for example, NR, NB-IOT, Untrusted Non-3GPP, Trusted Non-3GPP, Trusted IEEE 802.11 Non-3GPP access, Wireline, etc.
NSSAI provided by the UE to the Serving PLMN during registration.
The Residential Gateway (RG) is a device providing, for example voice, data, broadcast video, video on demand, to other devices in customer premises.
Routing Binding Indication:
Information included in a request or notification and that can be used by the SCP for discovery and associated selection to of a suitable target. See clauses 126.96.36.199
Indicator that allows together with SUCI/SUPI Home Network Identifier to route network signalling to AUSF and UDM instances capable to serve the subscriber.
SNPN enabled UE:
A UE configured to use stand-alone Non-Public Networks.
SNPN access mode:
A UE operating in SNPN access mode only selects stand-alone Non-Public Networks over Uu.
Service based interface:
It represents how a set of services is provided/exposed by a given NF.
The uninterrupted user experience of a service, including the cases where the IP address and/or anchoring point change.
Service Data Flow Filter:
A set of packet flow header parameter values/ranges used to identify one or more of the packet (IP or Ethernet) flows constituting a Service Data Flow.
Service Data Flow Template:
The set of Service Data Flow filters in a policy rule or an application identifier in a policy rule referring to an application detection filter, required for defining a Service Data Flow.
The continuity of a PDU Session. For PDU Session of IPv4 or IPv6 or IPv4v6 type "session continuity" implies that the IP address is preserved for the lifetime of the PDU Session.
SMF Service Area:
The collection of UPF Service Areas of all UPFs which can be controlled by one SMF.
Stand-alone Non-Public Network:
A non-public network not relying on network functions provided by a PLMN
S-NSSAI based on subscriber information, which a UE is subscribed to use in a PLMN
Time Sensitive Communication (TSC):
A communication service that supports deterministic communication and/or isochronous communication with high reliability and availability. It is about providing packet transport with QoS characteristics such as bounds on latency, loss, and reliability, where end systems and relay/transmit nodes can be strictly synchronized.
TSN working domain:
UDM Group ID:
Synchronization domain for a localized set of devices collaborating on a specific task or work function in a TSN network, corresponding to a gPTP domain defined in IEEE 802.1AS [104
This refers to one or more UDM instances managing a specific set of SUPIs. An UDM Group consists of one or multiple UDM Sets.
UDR Group ID:
This refers to one or more UDR instances managing a specific set of SUPIs. An UDR Group consists of one or multiple UDR Sets.
UPF Service Area:
An area consisting of one or more TA(s) within which PDU Session associated with the UPF can be served by (R)AN nodes via a N3 interface between the (R)AN and the UPF without need to add a new UPF in between or to remove/re-allocate the UPF.
UPF functionality that aims at diverting Uplink traffic, based on filter rules provided by SMF, towards Data Network.
In the RAN, WB-E-UTRA is the part of E-UTRA that excludes NB-IoT. In the Core Network, WB-E-UTRA also excludes LTE-M.
Wireline 5G Access Network:
The Wireline 5G Access Network (W-5GAN) is a wireline AN that connects to a 5GC via N2 and N3 reference points. The W-5GAN can be either a W-5GBAN or W-5GCAN.
Wireline 5G Cable Access Network:
The Wireline 5G Cable Access Network (W-5GCAN) is the Access Network defined in CableLabs.
Wireline BBF Access Network:
The Wireline 5G BBF Access Network (W-5GBAN) is the Access Network defined in BBF.
Wireline Access Gateway Function (W-AGF):
The Wireline Access Gateway Function (W-AGF) is a Network function in W-5GAN that provides connectivity to the 5G Core to 5G-RG and FN-RG.
If one AUSF/PCF/UDR/UDM group consists of multiple AUSF/PCF/UDR/UDM Sets, AUSF/PCF/UDR/UDM instance from different Set may be selected to serve the same UE. The temporary data which is not shared across different Sets may be lost, e.g. the event subscriptions stored at one UDM instance are lost if another UDM instance from different Set is selected and no data shared across the UDM Sets.
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
5G Core Network
5G Local Area Network
5G Access Network
5G Access Network Packet Delay Budget
5G-Equipment Identity Register
5G Globally Unique Temporary Identifier
5G Broadband Residential Gateway
5G Cable Residential Gateway
5G Grand Master
5G Residential Gateway
5G S-Temporary Mobile Subscription Identifier
5G Virtual Network
5G QoS Identifier
Access and Mobility Management Function
Access Traffic Steering, Switching, Splitting
Authentication Server Function
Best Master Clock Algorithm
Binding Support Function
Closed Access Group
Common API Framework for 3GPP northbound APIs
Core Network Packet Delay Budget
DN Access Identifier
Data Network Name
Device-side TSN translator
evolved Packet Data Gateway
EPS Bearer Identity
Extended Unique Identifier
Forwarding Action Rule
Fixed Network Broadband RG
Fixed Network Cable RG
Fixed Network RG
Fully Qualified Domain Name
Guaranteed Flow Bit Rate
Gateway Mobile Location Centre
Generic Public Subscription Identifier
Globally Unique AMF Identifier
Home Routed (roaming)
Integrated access and backhaul
IMEI Type Allocation Code
Inter PLMN UP Security
Local Area Data Network
Local Break Out (roaming)
Location Management Function
Level of Automation
LTE Positioning Protocol
Location Retrieval Function
Mission Critical Service
Maximum Data Burst Volume
Maximum Flow Bit Rate
Mobile Initiated Connection Only
Multimedia Priority Service
Multi-Path TCP Protocol
Non-3GPP InterWorking Function
Non-5G-Capable over WLAN
Network Access Identifier
Network Exposure Function
Next Generation Application Protocol
Network Repository Function
Network Slice Instance Identifier
Network Slice-Specific Authentication and Authorization
Network Slice Selection Assistance Information
Network Slice Selection Function
Network Slice Selection Policy
Network-side TSN translator
Network Data Analytics Function
Policy Control Function
Packet Delay Budget
Packet Detection Rule
Protocol Data Unit
Permanent Equipment Identifier
Packet Error Rate
Packet Flow Description
Public Network Integrated Non-Public Network
Paging Policy Differentiation
Paging Proceed Flag
Paging Policy Indicator
PDU Session Anchor
Precision Time Protocol
QoS Flow Identifier
Quality of Experience
Radio Capabilities Signalling optimisation
(Radio) Access Network
Remote Interference Management
Reflective QoS Attribute
Reflective QoS Indication
Redundancy Sequence Number
Standalone New Radio
Service Based Architecture
Service Based Interface
Service Communication Proxy
Security Anchor Functionality
Security Edge Protection Proxy
Session Management Function
Short Message Service Function
Stand-alone Non-Public Network
Single Network Slice Selection Assistance Information
Session and Service Continuity
Session and Service Continuity Mode Selection Policy
Subscription Concealed Identifier
Subscription Permanent Identifier
Trusted Non-3GPP Access Network
Trusted Non-3GPP Access Point
Trusted Non-3GPP Gateway Function
Transport Network Layer
Transport Network Layer Association
Time Sensitive Communication
TSC Assistance Information
Time Sensitive Networking
TSN Grand Master
Traffic Steering Policy
Trusted WLAN Interworking Function
UE radio Capability Management Function
Unified Data Management
Unified Data Repository
Unstructured Data Storage Function
User Plane Function
Ultra Reliable Low Latency Communication
UE Reachability Request Parameter for AMF
UE Route Selection Policy
Virtual Local Area Network
Wireline 5G Access Network
Wireline BBF Access Network
Wireline 5G Cable Access Network
Wireline Access Gateway Function