5G Glossary: 700 Standards-Aligned Terms

Every 5G concept covered by the 5G6GTech curriculum, organized by technical domain. Click any term for a full definition, key functions, relevant 3GPP/ITU-R specifications, and related concepts.

RAN262 terms

gNodeB (gNB)CU-DU Split Open RAN (O-RAN)RIC (RAN Intelligent Controller)SDAP PDCP RRC RRC_INACTIVE NSA vs SA EN-DC PSS SSS PBCH PBCH DMRS MIB SIB1 OSI SIB2 SIB3 SIB4 SIB5 SIB9 CORESET CORESET 0 Search Space Search Space 0 CSS USS PDCCH PDSCH PUCCH PUCCH Format 0 PUCCH Format 1 PUCCH Format 2 PUCCH Format 3 PUCCH Format 4 PUSCH DMRS DMRS Type 1 DMRS Type 2 PT-RS SRS SRS for Codebook SRS for Non-Codebook SRS for Antenna Switching SRS for Beam Management TRS PRS RIM-RS CLI-RSSI CLI-SRS PRACH Format 0 PRACH Format 1 PRACH Format 2 PRACH Format 3 PRACH Short Formats Zadoff-Chu Sequence Root Sequence Index Cyclic Shift (Ncs)High Speed Flag CP-OFDM DFT-s-OFDM Normal Cyclic Prefix Extended Cyclic Prefix Radio Frame Subframe Slot Mini-slot SFI Flexible Symbol Resource Element (RE)PRB CRB VRB Initial BWP Active BWP Default BWP BWP Switching Cross-Carrier Scheduling PCell SCell PSCell SpCell Rate Matching TBS Determination CBG Code Block Segmentation Downlink Preemption Uplink Preemption QPSK 16QAM 64QAM 256QAM 1024QAM pi/2-BPSK LDPC Base Graph 1 LDPC Base Graph 2 Polar Codes Redundancy Version (RV)IR-HARQ Chase Combining (CC)DAI HARQ-ACK Codebook Type 1 HARQ-ACK Codebook Type 2 Rank Indicator (RI)PMI CQI Layer Indicator (LI)Codebook Type I Codebook Type II Enhanced Type II CSI Analog Beamforming Digital Beamforming Hybrid Beamforming Beam Sweeping Beam Determination Beam Reporting BFD BFR TCI State QCL Type A QCL Type B QCL Type C QCL Type D Spatial Relation Info Timing Advance (TA)TAC Timing Advance Timer Uplink Power Control Closed Loop Power Control P0-PUSCH Fractional Power Control Alpha PHR MPR A-MPR LCP PBR BSD BSR Scheduling Request (SR)sr-ProhibitTimer C-DRX drx-onDurationTimer drx-InactivityTimer drx-RetransmissionTimerDL drx-RetransmissionTimerUL Short DRX Cycle Long DRX Cycle SPS Configured Grant Type 1 Configured Grant Type 2 MAC CE SCell Activation MAC CE TCI Indication MAC CE Spatial Relation Msg1 PRACH Msg2 RAR Msg3 Msg4 ra-ContentionResolutionTimer Backoff Indicator (BI)TC-RNTI RLC TM RLC UM RLC AM RLC Status PDU RLC Polling Bit t-PollRetransmit t-Reassembly t-StatusProhibit maxRetxThreshold RoHC PDCP SN PDCP Duplication discardTimer PDCP Control PDU SDAP QoS Flow Mapping QFI Reflective QoS Default DRB SDAP Header RRC Setup Procedure RRC Resume Procedure RRC Reconfiguration RRC Re-establishment RRC Release with Suspend I-RNTI RNA RNAU S-Criterion R-Criterion Priority-Based Re-selection Treselection Paging Occasion (PO)Paging Frame (PF)PEI Event A1 Event A2 Event A3 Event A4 Event A5 Event A6 Event B1 Event B2 Time-to-Trigger (TTT)RLF N310 N311 Timer T310 Timer T311 Timer T304 Xn-C Interface Xn-U Interface XnAP NG-C Interface NG-U Interface NGAP F1-C Interface F1-U Interface F1AP E1 Interface E1AP Conditional Handover (CHO)DAPS Handover MRO MCG SCG Split Bearer Master Node (MN)Secondary Node (SN)MR-DC NE-DC NGEN-DC NR-DC SCG Failure Fast MCG Recovery O-RU, O-DU & O-CU Near-RT RIC Non-RT RIC SMO Open Fronthaul (7-2x)E2 Interface A1 Interface O1 Interface xApps rApps P-RNTI RA-RNTI SI-RNTI CS-RNTI SFI-RNTI INT-RNTI CI-RNTI TPC-PUSCH-RNTI TPC-PUCCH-RNTI TPC-SRS-RNTI MCS-C-RNTI CSI-RS for Beam Management CSI-RS for Tracking (TRS)CSI-RS for L3 Mobility NZP-CSI-RS ZP-CSI-RS CSI-IM

Core Network93 terms

AMF SMF UPF UDM PCF SBA NRF NSSF NEF NWDAF PDU Session UDR CUPS SCP CHF BSF 5G-EIR LMF GMLC N3IWF TNGF W-AGF Namf Interface Nsmf Interface Npcf Interface Nudm Interface Nausf Interface Nnrf Interface Nnssf Interface Nnef Interface Naf Interface Nudr Interface Nudsf Interface Nnwdaf Interface Nlmf Interface N1 Interface N2 Interface N3 Interface N4 Interface N6 Interface N9 Interface N10 Interface N11 Interface N12 Interface N14 Interface N15 Interface N16 Interface N22 Interface N26 Interface N32 Interface N33 Interface RM-DEREGISTERED RM-REGISTERED CM-IDLE CM-CONNECTED Initial Registration Mobility Registration Periodic Registration Deregistration Procedure PDU Session IPv4 PDU Session IPv6 PDU Session Ethernet PDU Session Unstructured SSC Mode 1 SSC Mode 2 SSC Mode 3 PSA I-UPF UL CL Branching Point (BP)PFCP PDR FAR QER URR BAR PFCP Association GTP-U TEID 5QI Non-GBR GBR Delay-Critical GBR PDB PER GFBR MFBR Session-AMBR UE-AMBR ARP RQI GUAMI SNPN

5G-Advanced (Rel-18)200 terms

AI/ML CSI Compression AI/ML Beam Prediction AI/ML Direct RF Positioning AI/ML Lifecycle Management (LCM)Two-Sided AI Architecture One-Sided AI Architecture AI-Driven BFR AI/ML Link Adaptation AI/ML MU-MIMO Pairing AI/ML Doppler Compensation Concept Drift Detection Baseband Model Quantization Air Interface Federated Learning AI-Driven PAPR Reduction Deep Unfolding MIMO Detector Over-The-Air (OTA) Retraining Sub-Band AI Beamforming AI-Enhanced Handover Prediction AI-Based RACH Detection Joint Source-Channel Coding (JSCC)AI-Assisted Sidelink Scheduling Physics-Informed Neural Networks (PINN)AI Baseband Conformance Testing On-Device AI Security Enclave AI-Driven Uplink Power Control SBFD Architecture Analog RF SIC Digital Baseband SIC SBFD Guard Sub-Bands Cross-Link Interference (CLI)SBFD Slot Formats Spatial Domain Isolation SBFD Ultra-Low HARQ Latency SBFD Uplink Coverage Boost Dynamic Power Imbalance Handling CLI-RSSI Measurement SRS-RSRP for CLI gNB-to-gNB CLI Coordination SBFD Industrial Campus Network SBFD In-Band Relay SBFD ACLR Compliance SBFD Fractional Frequency Reuse SBFD UE Capability Signaling RF Circulators in SBFD 5G-Advanced TDD Evolution Coherent Joint Transmission (CJT)Unified TCI Framework 4-Tx Uplink Codebook Dynamic Port Selection HST Multi-TRP Coordination Fast DCI Beam Indication Fast SCell BFR Multi-Panel UE (MPUE)UL Multi-TRP PUSCH Group-Based Beam Reporting Cross-Carrier Beam Indication Angle-Delay Reciprocity Cell-Free Distributed MIMO Rel-18 PTRS Enhancements Inter-Cell NC-JT over Xn Sub-Band CSI Reporting Polarization Multiplexed MIMO Enhanced UL Precoding Codebook Dynamic Point Blanking (DPB)3D Elevation Beamforming XR-Aware Scheduling XR Frame PDB Dynamic I-Frame Prioritization XR-Specific DRX Multi-Modal Stream Synchronization XR Configured Grant Enhancements XR Discard Timer Optimization L4S for 5G-Advanced XR Split Rendering Architecture Standardized XR 5QI Cloud Gaming Latency Loops Spatial Audio Stream Transport Variable Bitrate (VBR) XR Handling HMD Power Optimization Uplink XR Video Streaming XR Jitter Mitigation Holographic Telepresence Asynchronous Time Warp (ATW)XR QoE Metrics XR Edge GPU Acceleration eRedCap Device Profile 5 MHz Channel Bandwidth 1-Rx Antenna Architecture Low-Power Wake-Up Signal (LP-WUS)10 Mbps Throughput Ceiling eRedCap Half-Duplex FDD Relaxed RRM for eRedCap Paging Early Indication (PEI)eRedCap in Smart Utilities eRedCap Wearables Profile eRedCap PDCCH Reduction Early Data Transmission (EDT)eRedCap Point-of-Sale (POS)eRedCap Carrier Coexistence 5G-Advanced IoT Ecosystem Network Energy Savings (NES)Time-Domain Micro-Sleep Spatial-Domain Antenna Muting Cell DTX / Cell DRX Dynamic Carrier Shutdown Energy-Saving BWP Adaptation Multi-Level Base Station Sleep AI-Driven Energy Management SSB Transmission Muting Energy-Efficient DPD Energy-Aware Load Balancing Fast Wake-Up Signaling Standardized Energy Efficiency KPI Dynamic Thermal Throttling Beam-Specific Power Scaling Renewable-Aware Telemetry O-RAN Energy Control Plane Base Station Power Models Coverage-Energy Trade-Off 5G-Advanced Green Network Network-Controlled Repeaters (NCR)Side-Control Information (SCI)NCR Functional Split (NCR-MT & NCR-Fwd)Beamforming Without Baseband NCR TDD Timing Coordination NCR Uplink Noise Muting NCR Dynamic Gain Control mmWave Urban Shadow Bending Frequency-Selective NCR Multi-Beam NCR Operation NCR vs RIS Comparison NCR OAM Registration SCI DCI Signaling Format Solar-Powered NCR Nodes NCR Economic Impact NR-NTN Phase 2 Regenerative Satellite Payload 10 MHz Satellite Channelization Direct-to-Cell Satellite Access Satellite Doppler Pre-Compensation VSAT Maritime & Aviation Mobility Inter-Satellite Links (ISL)Continuous Feeder Link Switchover NTN Selective HARQ Disabling Circular Polarization in NTN Satellite-Guided Sidelink Massive Delay PRACH Enhancements Earth-Fixed Spot Beams NTN Tracking Area Management Ka/Ku-Band NR-NTN Harmonization Ambient IoT Device Classes RF Energy Harvesting Backscatter Modulation Mechanics Monostatic & Bistatic Ambient Topologies Ambient IoT Supply Chain Tracking Ambient Continuous Wave (CW)Ambient IoT Coexistence Ultra-Low-Power Tag Authentication gNodeB Ambient Reader Mode Zero-Energy IoT Revolution Carrier-Phase Positioning (RTK)Sidelink Positioning (SL-PRS)Low-Latency AGV Positioning Positioning Integrity & Alert Limits PRS Efficiency Enhancements Multi-RTT Phase 2 Joint 3D AoA/AoD Localization Indoor Factory (InF) Positioning Sidelink Anchor Nodes Low-Power Positioning for Wearables Sidelink Unlicensed (NR-U SL)Sidelink DRX for Wearables Sidelink Carrier Aggregation Coordinated Sidelink Mode 2 Sidelink Relay Phase 2 Tele-Operated Driving (TOD)Sidelink RTT Ranging Sidelink Channel FDM Automated Vehicle Platooning 5G-Advanced Sidelink Suite UAV 3D Cellular Coverage Flight Path Reporting Height-Dependent Power Control Cellular Remote ID for Drones 5G UTM Integration Distributed NWDAF Architecture 5GC Federated Learning Framework Enhanced EAS Discovery EAS Session Relocation 5GC Satellite Interworking 5GC Disaster Roaming Closed-Loop Slice SLA Assurance 5G LAN-Type Service Phase 2 Timing as a Service (TaaS)GTP-U Protocol Optimization Cloud-Native NF Energy Scaling Intent-Based Network Management Multi-Access PDU (MAPDU) Phase 2 Decentralized Identity (DID) in 5GC AI-Assisted Paging Optimization

5G Glossary: 700 Standards-Aligned Terms

RAN262 terms

Core Network93 terms

Spectrum46 terms

Security37 terms

Services62 terms

5G-Advanced (Rel-18)200 terms