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full Table of Contents for  TS 23.501  Word version:   16.3.0

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1…   3…   4…   4.2.4   4.2.5…   4.2.8            4.2.9…   4.3…   4.3.3   4.3.4   4.3.5   4.4…   4.4.6…   4.4.8   5…   5.4…   5.6…   5.7…   5.8…   5.10…   5.16…   5.17   5.18…   5.27…   5.31   5.32   5.33   5.34   5.35…   6…   6.3…   7…   7.2…   8…   8.2.4   8.2.5…   8.3…   A…   D…   E…   F   G…   G.3   G.4…


3  Definitions and abbreviationsWord-p. 20
3.1  Definitions

5GLAN Group: 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.).
5G System: 3GPP system consisting of 5G Access Network (AN), 5G Core Network and UE.
5G-BRG: The 5G-BRG is a 5G-RG defined in BBF.
5G-CRG: The 5G-CRG is a 5G-RG specified in DOCSIS MULPI [89].
5G-RG: 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.
Allowed NSSAI: 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.
Allowed Area: Area where the UE is allowed to initiate communication as specified in clause
AMF Region: An AMF Region consists of one or multiple AMF Sets.
AMF Set: 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.
Application identifier: 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.
Configured NSSAI: 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.
Delegated Discovery: This refers to delegating the discovery and associated selection of NF instances or NF service instances to an SCP.
Direct Communication: 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.
Emergency Registered: 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.
Endpoint Address: An address used by a NF service consumer to access the NF service (i.e. to invoke service operations) provided by a NF service provider. An Endpoint Address is represented in the syntax of Uniform Resource Identifier (e.g. part of Resource URI of the NF service API).
En-gNB: as defined in TS 37.340 [31].
Expected UE Behaviour: Set of parameters provisioned by an external party to 5G network functions on the foreseen or expected UE behaviour, see clause 5.20.
Fixed Network Residential Gateway: 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: A Fixed Network RG (FN-BRG) is a FN-RG specified in BBF TR-124 [90].
Fixed Network Cable Residential Gateway: A Fixed Network Cable RG (FN-CRG) is a FN-RG with cable modem specified in DOCSIS MULPI [89].
Forbidden Area: An area where the UE is not allowed to initiate communication as specified in clause
GBR QoS Flow: A QoS Flow using the GBR resource type or the Delay-critical GBR resource type and requiring guaranteed flow bit rate.
IAB-donor: 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 [42].
IAB-node: 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 [42].
Indirect Communication: This refers to the communication between NFs or NF services via an SCP.
Initial Registration: UE registration in RM-DEREGISTERED state as specified in clause 5.3.2.
Intermediate SMF (I-SMF): 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).
LTE-M: a 3GPP RAT type Identifier used in the Core Network only, which is a sub-type of E-UTRAN RAT type, and defined to identify in the Core Network the E-UTRAN 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 Pattern: Network concept of determining within the AMF the UE mobility parameters as specified in clause
Mobility Registration Update: UE re-registration when entering new TA outside the TAI List as specified in clause 5.3.2.
MPS-subscribed UE: 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.
NGAP UE-TNLA-binding: The binding between a NGAP UE association and a specific TNL association for a given UE.
Network Function: A 3GPP adopted or 3GPP defined processing function in a network, which has defined functional behaviour and 3GPP defined interfaces.
NOTE 1: 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.
Network Instance: Information identifying a domain. Used by the UPF for traffic detection and routing.
Network Slice: 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.
NSI ID: 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.
NF instance: an identifiable instance of the NF.
NF service: 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.
NF Set: 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.
NG-RAN: A radio access network that supports one or more of the following options with the common characteristics that it connects to 5GC:
  1. Standalone New Radio.
  2. New Radio is the anchor with E-UTRA extensions.
  3. Standalone E-UTRA.
  4. E-UTRA is the anchor with New Radio extensions.

Non-Allowed Area: Area where the UE is allowed to initiate Registration procedure but no other communication as specified in clause
Non-Public Network: See definition in TS 22.261 [2].
Non-Seamless Non-3GPP offload: 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.
Pending NSSAI: 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.
PDU Session: 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: UE re-registration at expiry of periodic registration timer as specified in clause 5.3.2.
Private communication: See definition in TS 22.261 [2].
Public network integrated NPN: A non-public network deployed with the support of a PLMN.
(Radio) Access Network: See 5G Access Network.
Requested NSSAI: NSSAI provided by the UE to the Serving PLMN during registration.
Residential Gateway: The Residential Gateway (RG) is a device providing, for example voice, data, broadcast video, video on demand, to other devices in customer premises.
Routing Indicator: 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.
Service Continuity: 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.
Session Continuity: 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
Subscribed S-NSSAI: 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.
UDM Group ID: 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.
Uplink Classifier: UPF functionality that aims at diverting Uplink traffic, based on filter rules provided by SMF, towards Data Network.
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.
NOTE 2: 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.
3.2  AbbreviationsWord-p. 25
5GC (5G Core Network) – 5GLAN (5G Local Area Network) – 5GS (5G System) – 5G‑AN (5G Access Network) – 5G‑EIR (5G‑Equipment Identity Register) – 5G‑GUTI (5G Globally Unique Temporary Identifier) – 5G‑BRG (5G Broadband Residential Gateway) – 5G‑CRG (5G Cable Residential Gateway) – 5G‑RG (5G Residential Gateway) – 5G‑S‑TMSI (5G S‑Temporary Mobile Subscription Identifier) – 5QI (5G QoS Identifier) – AF (Application Function) – AMF (Access and Mobility Management Function) – AS (Access Stratum) – ATSSS (Access Traffic Steering, Switching, Splitting) – ATSSS‑LL (ATSSS Low‑Layer) – AUSF (Authentication Server Function) – BSF (Binding Support Function) – CAG (Closed Access Group) – CAPIF (Common API Framework for 3GPP northbound APIs) – CHF (Charging Function) – CN PDB (Core Network Packet Delay Budget) – CP (Control Plane) – DL (Downlink) – DN (Data Network) – DNAI (DN Access Identifier) – DNN (Data Network Name) – DRX (Discontinuous Reception) – DS‑TT (Device‑side TSN translator) – ePDG (evolved Packet Data Gateway) – EBI (EPS Bearer Identity) – EUI (Extended Unique Identifier) – FAR (Forwarding Action Rule) – FN‑BRG (Fixed Network Broadband RG) – FN‑CRG (Fixed Network Cable RG) – FN‑RG (Fixed Network RG) – FQDN (Fully Qualified Domain Name) – GFBR (Guaranteed Flow Bit Rate) – GMLC (Gateway Mobile Location Centre) – GPSI (Generic Public Subscription Identifier) – GUAMI (Globally Unique AMF Identifier) – HR (Home Routed (roaming)) – IAB (Integrated Access and Backhaul) – I‑SMF (Intermediate SMF) – LADN (Local Area Data Network) – LBO (Local Break Out (roaming)) – LMF (Location Management Function) – LoA (Level of Automation) – LPP (LTE Positioning Protocol) – LRF (Location Retrieval Function) – MCX (Mission Critical Service) – MDBV (Maximum Data Burst Volume) – MFBR (Maximum Flow Bit Rate) – MICO (Mobile Initiated Connection Only) – MPS (Multimedia Priority Service) – MPTCP (Multi‑Path TCP Protocol) – N3IWF (Non‑3GPP InterWorking Function) – N5CW (Non‑5G‑Capable over WLAN) – NAI (Network Access Identifier) – NEF (Network Exposure Function) – NF (Network Function) – NGAP (Next Generation Application Protocol) – NID (Network identifier) – NPN (Non‑Public Network) – NR (New Radio) – NRF (Network Repository Function) – NSI ID (Network Slice Instance Identifier) – NSSAA (Network Slice‑Specific Authentication and Authorization) – NSSAI (Network Slice Selection Assistance Information) – NSSF (Network Slice Selection Function) – NSSP (Network Slice Selection Policy) – NW‑TT (Network‑side TSN translator) – NWDAF (Network Data Analytics Function) – PCF (Policy Control Function) – PDR (Packet Detection Rule) – PDU (Protocol Data Unit) – PEI (Permanent Equipment Identifier) – PER (Packet Error Rate) – PFD (Packet Flow Description) – PPD (Paging Policy Differentiation) – PPF (Paging Proceed Flag) – PPI (Paging Policy Indicator) – PSA (PDU Session Anchor) – QFI (QoS Flow Identifier) – QoE (Quality of Experience) – RACS (Radio Capabilities Signalling optimisation) – (R)AN ((Radio) Access Network) – RG (Residential Gateway) – RIM (Remote Interference Management) – RQA (Reflective QoS Attribute) – RQI (Reflective QoS Indication) – RSN (Redundancy Sequence Number) – SA NR (Standalone New Radio) – SBA (Service Based Architecture) – SBI (Service Based Interface) – SCP (Service Communication Proxy) – SD (Slice Differentiator) – SEAF (Security Anchor Functionality) – SEPP (Security Edge Protection Proxy) – SMF (Session Management Function) – SMSF (Short Message Service Function) – SN (Sequence Number) – SNPN (Stand‑alone Non‑Public Network) – S‑NSSAI (Single Network Slice Selection Assistance Information) – SSC (Session and Service Continuity) – SSCMSP (Session and Service Continuity Mode Selection Policy) – SST (Slice/Service Type) – SUCI (Subscription Concealed Identifier) – SUPI (Subscription Permanent Identifier) – SV (Software Version) – TAC IMEI (Type Allocation Code) – TNAN (Trusted Non‑3GPP Access Network) – TNAP (Trusted Non‑3GPP Access Point) – TNGF (Trusted Non‑3GPP Gateway Function) – TNL (Transport Network Layer) – TNLA (Transport Network Layer Association) – TSC (Time Sensitive Communication) – TSN (Time Sensitive Networking) – TSP (Traffic Steering Policy) – UCMF (UE radio Capability Management Function) – UDM (Unified Data Management) – UDR (Unified Data Repository) – UDSF (Unstructured Data Storage Function) – UL (Uplink) – UL CL (Uplink Classifier) – UPF (User Plane Function) – URLLC (Ultra Reliable Low Latency Communication) – URRP‑AMF (UE Reachability Request Parameter for AMF) – URSP (UE Route Selection Policy) – VID (VLAN Identifier) – VLAN (Virtual Local Area Network) – W‑5GAN (Wireline 5G Access Network) – W‑5GBAN (Wireline BBF Access Network) – W‑5GCAN (Wireline 5G Cable Access Network) – W‑AGF (Wireline Access Gateway Function) –

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