| 16-QAM | 16-state Quaternary Amplitude Modulation |
| 1xCSFB | Circuit Switched Fallback to 1xRTT |
| 3D | Three Dimensional |
| 3GP | 3GPP file format |
| 3GPP | Third Generation Partnership Project |
| 5G | Fifth Generation |
| 5G-AN | 5G Access Network |
| 5GC | 5G Core Network |
| 5G-EIR | 5G-Equipment Identity Register |
| 5G-GUTI | 5G Globally Unique Temporary Identifier |
| 5GS | 5G System |
| 5G-S-TMSI | 5G S-Temporary Mobile Subscription Identifier |
| 5QI | 5G QoS Identifier |
| A/S | Actuator/sensor |
| AAA | Authentication, Authorization and Accounting |
| ABS | Almost Blank Subframe |
| AC | Access Category |
| ACK | Acknowledgement |
| ACLR | Adjacent Channel Leakage Ratio |
| ADC | Application Detection and Control |
| AES | Advanced Encryption Standard |
| AF | Application Function |
| AKA | Authentication and Key Agreement |
| AM | Acknowledged Mode |
| AMBR | Aggregate Maximum Bit Rate |
| AMF | Access and Mobility Management Function |
| AN | Access Network |
| ANDSF | Access Network Discovery and Selection Function |
| ANR | Automatic Neighbour Relation |
| APN | Access Point Name |
| AR | Augmented Reality |
| ARP | Allocation and Retention Priority |
| ARPF | Authentication Credential Repository |
| and | Processing Function |
| ARQ | Automatic Repeat Request |
| AS | Access Stratum |
| AUSF | Authentication Server Function |
| BAR | Buffering Action Rule |
| BBU | Base-Band Unit (DRoF context) |
| BCCH | Broadcast Control Channel |
| BCH | Broadcast Channel |
| BL | Bandwidth reduced Low complexity |
| BPSK | Binary Phase Shift Keying |
| BR-BCCH | Bandwidth Reduced Broadcast |
| Control | Channel |
| BSF | Binding Support Function |
| BSR | Buffer Status Report |
| C/I | Carrier-to-Interference Power Ratio |
| CA | Carrier Aggregation |
| CAPIF | Common API Framework (for 3GPP |
| northbound | APIs) |
| CC | Component Carrier |
| CG | Cell Group |
| CIF | Carrier Indicator Field |
| CIoT | Cellular Internet of Things |
| CMAS | Commercial Mobile Alert Service |
| CMC | Connection Mobility Control |
| CoMP | Coordinated Multi Point |
| CP | Cyclic Prefix |
| CP | Control Plane |
| C-plane | Control Plane |
| CQI | Channel Quality Indicator |
| CRC | Cyclic Redundancy Check |
| CRE | Cell Range Extension |
| C-RNTI | Cell RNTI |
| CRS | Cell-specific Reference Signal |
| CSA | Common Subframe Allocation |
| CSG | Closed Subscriber Group |
| CSI | Channel State Information |
| CSI-IM | CSI interference measurement |
| CSI-RS | CSI reference signal |
| CUPS | Control and User Plane Separation |
| DC | Dual Connectivity |
| DCCH | Dedicated Control Channel |
| DCI | Downlink Control Information |
| DCN | Dedicated Core Network |
| DDoS | Distributed Denial of Service |
| DEI | Drop Eligible Indicator |
| DeNB | Donor eNB |
| DFTS-OFDM | Direct Fourier Transform Spread – OFDM |
| DHCP | Dynamic Host Configuration Protocol diff-serv Differentiated services |
| DL | Downlink |
| DMTC | Discovery Signal Measurement |
| Timing | Configuration |
| DN | Data Network |
| DNAI | DN Access Identifier |
| DNN | Data Network Name |
| DNS | Domain Name System |
| DRS | Discovery Reference Signal |
| DRX | Discontinuous Reception |
| DSCP | Differentiated services code point |
| DTCH | Dedicated Traffic Channel |
| DTX | Discontinuous Transmission |
| DwPTS | Downlink Pilot Time Slot |
| E2E | End to End |
| EAB | Extended Access Barring |
| EBI | EPS Bearer Identity |
| ECGI | E-UTRAN Cell Global Identifier |
| E-CID | Enhanced Cell-ID (positioning method) |
| ECM | EPS Connection Management |
| eFMSS | Enhancement to Flexible Mobile |
| Service | Steering |
| eIMTA | Enhanced Interference Management |
| and | Traffic Adaptation |
| EMM | EPS Mobility Management |
| eMBB | enhanced Mobile BroadBand |
| eMPS | enhanced Multimedia Priority Service |
| eNB | E-UTRAN NodeB |
| EPC | Evolved Packet Core |
| EPDCCH | Enhanced Physical Downlink Control Channel |
| en-gNB | 5G base station with LTE interface |
| ePDG | evolved Packet Data Gateway |
| EPS | Evolved Packet System |
| E-RAB | E-UTRAN Radio Access Bearer |
| ETWS | Earthquake and Tsunami Warning System |
| E-UTRA | Evolved UTRA |
| E-UTRAN | Evolved UTRAN |
| FAR | Forwarding Action Rule |
| FDD | Frequency Division Duplex |
| FDM | Frequency Division Multiplexing |
| FMSS | Flexible Mobile Service Steering |
| FQDN | Fully Qualified Domain Name |
| F-SEID | Fully Qualified SEID |
| F-TEID | Fully Qualified TEID |
| GBR | Guaranteed Bit Rate |
| GERAN | GSM EDGE Radio Access Network |
| GFBR | Guaranteed Flow Bit Rate |
| GMLC | Gateway Mobile Location Centre |
| gNB | 5G Node Base station |
| GNSS | Global Navigation Satellite System |
| GP | Guard Period |
| GPRS | General Packet Radio System |
| GPSI | Generic Public Subscription Identifier |
| GRE | Generic Routing Encapsulation |
| G-RNTI | Group RNTI |
| GSM | Global System for Mobile communication |
| GTP | GPRS Tunnelling Protocol |
| GTP-C | GPRS Tunnelling Protocol in the |
| Control | plane |
| GTP-U | GPRS Tunnelling Protocol in the |
| User | plane |
| GUAMI | Globally Unique AMF Identifier |
| GUMMEI | Globally Unique MME Identifier |
| GUTI | Globally Unique Temporary Identifier |
| GWCN | GateWay Core Network |
| H-SFN | Hyper System Frame Number |
| HeNB | Home eNB |
| HARQ | Hybrid ARQ |
| HCS | Hierarchical Cell Structure |
| HO | Handover |
| hPCF | home Policy Control Function |
| HPLMN | Home Public Land Mobile Network |
| HR | Home Routed (roaming) |
| HRPD | High Rate Packet Data |
| HSDPA | High Speed Downlink Packet Access |
| hSMF | home Session Management Function |
| http | hyptertext transfer protocol |
| ICIC | Inter-Cell Interference Coordination |
| ICP | Internet Content Provider |
| ID | Identification |
| IDC | In-Device Coexistence |
| IMS | IP Multimedia System |
| IMSI | International Mobile Subscriber Identity |
| IOPS | Isolated E-UTRAN Operation for |
| Public | Safety |
| IoT | Internet of Things |
| IP | Internet Protocol |
| IP-CAN | IP-Connectivity Access Network |
| IPv4 | Internet Protocol version 4 |
| IPv6 | Internet Protocol version 6 |
| I-RNTI | Inactive RNTI |
| ISM | Industrial, Scientific and Medical |
| KPAS | Korean Public Alert System |
| KPI | Key Performance Indicator |
| LAA | Licensed-Assisted Access |
| LADN | Local Area Data Network |
| LB | Load Balancing |
| LBO | Local Break Out (roaming) |
| LBT | Listen Before Talk |
| LCG | Logical Channel Group |
| LCR | Low Chip Rate |
| LCS | LoCation Service |
| LDPC | Low Density Parity Check |
| L-GW | Local Gateway |
| LHN | ID Local Home Network ID |
| LHN | Local Home Network |
| LIPA | Local IP Access |
| LMF | Location Management Function |
| LMISF | LI Mirror IMS State Function |
| LMU | Location Measurement Unit |
| LOS | Line-Of-Sight |
| LPPa | LTE Positioning Protocol Annex |
| LRF | Location Retrieval Function |
| LTE | Long Term Evolution |
| LWA | LTE-WLAN Aggregation |
| LWAAP | LTE-WLAN Aggregation Adaptation Protocol |
| LWIP | LTE WLAN Radio Level Integration |
| with | IPsec Tunnel |
| LWIP-SeGW | LWIP Security Gateway |
| MAC | Medium Access Control |
| MAC | Message Authentication Code (security context) |
| MBB | Mobile BroadBand |
| MBMS | Multimedia Broadcast Multicast Service |
| MBR | Maximum Bit Rate |
| MBSFN | Multimedia Broadcast multicast |
| service | Single Frequency Network |
| MCC | Mobile Country Code |
| MCCH | Multicast Control Channel |
| MCE | Multi-cell/multicast Coordination Entity |
| MCG | Master Cell Group |
| MCH | Multicast Channel |
| MCS | Modulation and Coding Scheme |
| MCX | Mission Critical Service |
| MDBV | Maximum Data Burst Volume |
| MDT | Minimization of Drive Tests |
| MeNB | Master eNB |
| MFBR | Maximum Flow Bit Rate |
| MGW | Media Gateway |
| MIB | Master Information Block |
| MICO | Mobile Initiated Connection Only |
| MIMO | Multiple Input Multiple Output |
| MIoT | Massive Internet of Things |
| MISO | Multiple Input Single Output |
| MME | Mobility Management Entity |
| mMTC | massive Machine Type Communication |
| MMTEL | Multimedia telephony |
| MNO | Mobile Network Operator |
| MPDCCH | MTC Physical Downlink Control Channel |
| MPS | Multimedia Priority Service |
| MSA | MCH Subframe Allocation |
| MSI | MCH Scheduling Information |
| MSP | MCH Scheduling Period |
| MTC | Machine-Type Communications |
| MTCH | Multicast Traffic Channel |
| MU-MIMO | Multi User MIMO |
| MVNO | Mobile Virtual Network Operator |
| N3IWF | Non-3GPP InterWorking Function |
| NACK | Negative Acknowledgement |
| NAI | Network Access Identifier |
| NAS | Non-Access Stratum |
| NB-IoT | Narrow Band Internet of Things |
| NCC | Next Hop Chaining Counter |
| NEF | Network Exposure Function |
| NF | Network Function |
| NFV | Network Function Virtualisation |
| ng-eNB | new generation eNB (4G access |
| network | but New Radio Interface) |
| NGAP | Next Generation Application Protocol |
| NG-RAN | New Generation (5G) Radio Access Network |
| NH | Next Hop key |
| NLOS | Non Line-Of-Sight |
| NNSF | NAS Node Selection Function |
| NPBCH | Narrowband Physical Broadcast channel |
| NPDCCH | Narrowband Physical Downlink |
| Control | channel |
| NPDSCH | Narrowband Physical Downlink |
| Shared | channel |
| NPRACH | Narrowband Physical Random |
| Access | channel |
| NPRS | Narrowband Positioning Reference Signal |
| NPSS | Narrowband Primary Synchronization Signal |
| NPUSCH | Narrowband Physical Uplink Shared channel |
| NR | Neighbour cell Relation |
| NR | New Radio |
| NRF | Network Repository Function |
| NRT | Neighbour Relation Table |
| NSI | ID Network Slice Instance Identifier |
| NSSAI | Network Slice Selection Assistance Information |
| NSSF | Network Slice Selection Function |
| NSSP | Network Slice Selection Policy |
| NSSS | Narrowband Secondary Synchronization Signal |
| NWDAF | Network Data Analytics Function |
| O&M | Operations & Maintenance |
| OFDM | Orthogonal Frequency Division Multiplexing |
| OFDMA | Orthogonal Frequency Division Multiple Access |
| OPI | Offload Preference Indicator |
| OTDOA | Observed Time Difference Of Arrival (positioning method) |
| PA | Power Amplifier |
| PAPR | Peak-to-Average Power Ratio |
| PBCH | Physical Broadcast CHannel |
| PBR | Prioritised Bit Rate |
| PCC | Policy and Charging Control |
| PCC | Primary Component Carrier |
| PCCH | Paging Control Channel |
| PCEF | Policy and Charging Enforcement Function |
| PCell | Primary Cell |
| PCF | Policy Control Function |
| PCFICH | Physical Control Format Indicator CHannel |
| PCH | Paging Channel |
| PCI | Physical Cell Identifier |
| PCP | Priority Code Point |
| PCRF | Policy and Charging Rule Function |
| PDCCH | Physical Downlink Control CHannel |
| PDCP | Packet Data Convergence Protocol |
| PDI | Packet Detection Information |
| PDN | Packet Data Network |
| PDR | Packet Detection Rule |
| PDSCH | Physical Downlink Shared CHannel |
| PDU | Protocol Data Unit |
| PEI | Permanent Equipment Identifier |
| PER | Packet Error Rate |
| PFCP | Packet Forwarding Control Protocol |
| PFD | Packet Flow Description |
| PGW | (or P-GW) PDN Gateway |
| PGW-C | PDN Gateway Control plane function |
| PGW-U | PDN Gateway User plane function |
| PHICH | Physical Hybrid ARQ Indicator CHannel |
| PHY | Physical layer |
| PLMN | Public Land Mobile Network |
| PMCH | Physical Multicast CHannel |
| PMK | Pairwise Master Key |
| PPD | Paging Policy Differentiation |
| PPF | Paging Proceed Flag |
| PPI | Paging Policy Indicator |
| PPPP | ProSe Per-Packet Priority |
| PRACH | Physical Random Access CHannel |
| PRB | Physical Resource Block |
| P-RNTI | Paging RNTI |
| ProSe | Proximity based Services |
| PSA | PDU Session Anchor |
| PSBCH | Physical Sidelink Broadcast CHannel |
| PSC | Packet Scheduling |
| PSCCH | Physical Sidelink Control CHannel |
| PSCell | Primary SCell |
| PSDCH | Physical Sidelink Discovery CHannel |
| PSK | Pre-Shared Key |
| PSM | Power Saving Mode |
| PSSCH | Physical Sidelink Shared CHannel |
| pTAG | Primary Timing Advance Group |
| PTW | Paging Time Window |
| PUCCH | Physical Uplink Control CHannel |
| PUSCH | Physical Uplink Shared CHannel |
| PWS | Public Warning System |
| QAM | Quadrature Amplitude Modulation |
| QCI | QoS Class Identifier |
| QER | QoS Enforcement Rule |
| QFI | QoS Flow Identifier |
| QoE | Quality of Experience |
| QoS | Quality of Service |
| (R)AN | (Radio) Access Network |
| RAC | Radio Admission Control |
| RACH | Random Access Channel |
| RA-RNTI | Random Access RNTI |
| RAT | Radio Access Technology |
| RB | Radio Bearer |
| RB | Resource Block |
| RBC | Radio Bearer Control |
| RCLWI | RAN Controlled LTE-WLAN Interworking |
| RF | Radio Frequency |
| RIBS | Radio-interface based synchronization |
| RIM | RAN Information Management |
| RLC | Radio Link Control |
| RMTC | RSSI Measurement Timing Configuration |
| RN | Relay Node |
| RNA | RAN-based Notification Area |
| RNC | Radio Network Controller |
| RNL | Radio Network Layer |
| RNTI | Radio Network Temporary Identifier |
| ROHC | Robust Header Compression |
| R-PDCCH | Relay Physical Downlink Control CHannel |
| RQA | Reflective QoS Attribute |
| RQI | Reflective QoS Indication |
| RRC | Radio Resource Control |
| RRH | Remote Radio Head |
| RRM | Radio Resource Management |
| RU | Resource Unit |
| S1-MME | S1 for the control plane |
| S1-U | S1 for the user plane |
| S8HR | S8 Home Routed |
| SA | NR Standalone New Radio |
| SAE | System Architecture Evolution |
| SAP | Service Access Point |
| SBA | Service Based Architecture |
| SBCCH | Sidelink Broadcast Control Channel |
| SBI | Service Based Interface |
| SCC | Secondary Component Carrier |
| SCell | Secondary Cell |
| SC-FDMA | Single Carrier – Frequency Division |
| Multiple | Access |
| SCG | Secondary Cell Group |
| SCH | Synchronization Channel |
| SC-MCCH | Single Cell Multicast Control Channel |
| SC-MTCH | Single Cell Multicast Transport Channel |
| SC-N-RNTI | Single Cell Notification RNTI |
| SC-PTM | Single Cell Point To Multiploint |
| SC-RNTI | Single Cell RNTI |
| SCTP | Stream Control Transmission Protocol |
| SD | Slice Differentiator |
| SDAP | Service Data Adaptation Protocol |
| SDF | Service Data Flow |
| SDMA | Spatial Division Multiple Access |
| SD-RSRP | Sidelink Discovery Reference Signal Received Power |
| SDU | Service Data Unit |
| SEAF | Security Anchor Functionality |
| SEES | Service Exposure and Enablement Support |
| SeGW | Security Gateway |
| SEID | Session Endpoint Identifier |
| SeNB | Secondary eNB |
| SEPP | Security Edge Protection Proxy |
| SFN | System Frame Number |
| SGW | (or S-GW) Serving Gateway |
| SGW-C | Serving Gateway Control plane function |
| SGW-U | Serving Gateway User plane function |
| SI | System Information |
| SIB | System Information Block |
| SIDF | Subscription Identifier De-concealing Function |
| SIMO | Single Input Multiple Output |
| SIP | Session Initiation Protocol |
| SIPTO | Selected IP Traffic Offload |
| SIPTO@LN | Selected IP Traffic Offload at the Local Network |
| SI-RNTI | System Information RNTI |
| SISO | Single Input Single Output |
| SL-BCH | Sidelink Broadcast Channel |
| SL-DCH | Sidelink Discovery Channel |
| SL-RNTI | Sidelink RNTI |
| SL-SCH | Sidelink Shared Channel |
| SMF | Session Management Function |
| SMS | Short Message Service |
| SMSF | Short Message Service Function |
| S-NSSAI | Single Network Slice Selection |
| Assistance | Information |
| SON | Self Organised Network |
| SPID | Subscriber Profile ID for |
| RAT/Frequency | Priority |
| SR | Scheduling Request |
| SRB | Signalling Radio Bearer |
| S-RSRP | Sidelink Reference Signal Received Power |
| SSC | Session and Service Continuity |
| SST | Slice/Service Type |
| sTAG | Secondary Timing Advance Group |
| STCH | Sidelink Traffic Channel |
| SU | Scheduling Unit |
| SU-MIMO | Single User MIMO |
| SUCI | Subscription Concealed Identifier |
| SUPI | Subscription Permanent Identifier |
| SX3LIF | Split X3 LI Interworking Function |
| TA | Tracking Area |
| TAG | Timing Advance Group |
| TB | Transport Block |
| TCP | Transmission Control Protocol |
| TDD | Time Division Duplex |
| TDF | Traffic Detection Function |
| TDF-C | Traffic Detection Function Control |
| plane | function |
| TDF-U | Traffic Detection Function User |
| plane | function |
| TDM | Time Division Multiplexing |
| TEID | Tunnel Endpoint Identifier |
| TFT | Traffic Flow Template |
| TM | Transparent Mode |
| TMGI | Temporary Mobile Group Identity |
| TNL | Transport Network Layer |
| TNLA | Transport Network Layer Association |
| ToS | Type of Service |
| TSP | Traffic Steering Policy |
| TSSF | Traffic Steering Support Function |
| TTI | Transmission Time Interval |
| UAV | Unmanned Aerial Vehicle |
| UDM | Unified Data Management |
| UDP | User Datagram Protocol |
| UDR | Unified Data Repository |
| UDSF | Unstructured Data Storage Function |
| UE | User Equipment |
| UHD | Ultra High Definition |
| UICC | Universal Integrated Circuit Card |
| UL | CL Uplink Classifier |
| UL | Uplink |
| UM | Unacknowledged Mode |
| UMTS | Universal Mobile Telecommunication System |
| UP | User Plane |
| UPF | User Plane Function |
| U-plane | User plane |
| UpPTS | Uplink Pilot Time Slot |
| URLLC | Ultra Reliable Low Latency Communication |
| URR | Usage Reporting Rule |
| URSP | UE Route Selection Policy |
| USIM | Universal Subscriber Identity Module |
| UTRA | Universal Terrestrial Radio Access |
| UTRAN | Universal Terrestrial Radio Access Network |
| V2I | Vehicle-to-Infrastructure |
| V2N | Vehicle-to-Network |
| V2P | Vehicle-to-Pedestrian |
| V2V | Vehicle-to-Vehicle |
| V2X | Vehicle-to-Everything |
| VID | VLAN Identifier |
| VLAN | Virtual Local Area Network |
| vPCF | visited Policy Control Function |
| VR | Virtual Reality |
| VRB | Virtual Resource Block |
| vSMF | visited Session Management Function |
| WiFi | Wireless Fidelity |
| WLAN | Wireless Local Area Network |
| WT | WLAN Termination |
| X2 | GW X2 GateWay |
| X2-C | X2-Control plane |
| X2-U | X2-User plane |
| Xw-C | Xw-Control plane |
| Xw-U | Xw-User plane |