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G-PDU: GTP encapsulated user Plane Data Unit
G-RNTI: Group RNTI
GAA: Generic Authentication Architecture
GAD: Universal Geographical Area Description
GAGAN: GPS Aided Geo Augmented Navigation
GBA: Generic Bootstrapping Architecture
GBA_ME: ME-based GBA
GBA_U: GBA with UICC-based enhancements
GBR: Guaranteed Bit Rate
GC: General Client
GCI: Global Cable Identifier
GCID: GPRS Charging Identifier
GCS: Global Coordinate System
GCS AS: Group Communication Service Application Server
GCSE_LTE: Group Communication Service Enabler over LTE
GDPR: General Data Protection Directive
GDR: Gradual Decoder Refresh
GEO: Geostationary Earth Orbiting
GERAN: GSM EDGE Radio Access Network
GF: Grant-Free
GFBR: Guaranteed Flow Bit Rate
GGSN: Gateway GPRS Support Node
GIBA: GPRS-IMS-Bundled-Authentication
GIN: Group ID for Network Selection
GIP: Generic IP access
GKTP: Group Key Transport Payload
GLI: Global Line Identifier
GLMS: Group and List Management Server
GLONASS: GLObal'naya NAvigatsionnaya Sputnikovaya Sistema (Engl.: Global Navigation Satellite System)
GMC: Group Management Client
GMD: Group Message Delivery
GMK: Group Master Key
GMK-ID: Group Master Key Identifier
GMLC: Gateway Mobile Location Centre
GMM: GPRS Mobility Management
GMOP: Group Management OPeration
GMS: Group Management Server
GMSC: Gateway MSC
GNP: Generic Network Product
GNSS: Global Navigation Satellite Systems
GOB: Group Of Blocks
GOOSE: Generic Object-Oriented Substation Event
GP: Guard Period (for E-UTRA TDD operation)
GPI: GBA Push Information
GPON: Gigabit-capable Passive Optical Networks
GPRS: General Packet Radio Service
GPS: Global Positioning System
GPSI: Generic Public Subscription Identifier
GPU: Graphics Processing Units
GRE: Generic Routing Encapsulation
GRS80: Geodetic Reference System 1980
GRUU: Globally Routable User agent URIs
GS: Group Specification
GSCN: Global Synchronization Channel Number
GSF: Generic Security Functionality
GSM: Global System for Mobile Communications
GSMA: GSM Association
GSN: GPRS Support Node (either SGSN or GGSN)
GSO: Geostationary-Satellite Orbit
GST: Generic Network Slice Template
GTP: GPRS Tunnelling Protocol
GTP-C: GPRS Tunnelling Protocol for Control Plane
GTP-PDU: GTP-C PDU or GTP-U PDU
GTP-U: GPRS Tunnelling Protocol for user plane
GTPv2-C: GTP version 2, control plane
GTPv2-U: GTP version 2, user plane
GUAMI: Globally Unique AMF Identifier
GUI: Graphical User Interface
GUID: Globally Unique Identifer
GUK-ID: Group User Key Identifier
GUMMEI: Globally Unique MME Identifier
GUP: Generic User Profile
GUSS: GBA User Security Settings
GUTI: Globally Unique Temporary Identifier
GVNP: Generic Virtualized Network Product
GW: Gateway
GWCN: GateWay Core Network
GWUS: Group Wake Up Signal
GZIP: GNU ZIP
Gbps: Gigabits per second
H(e)NB: Home Node B or Home evolved Node B
H-AF: Home AF
H-ANDSF: Home-ANDSF
H-ARQ: Hybrid - ARQ
H-CHF: A CHF in HPLMN
H-DRA: Home DRA
H-ECS: Home Edge Configuration Server
H-EES: Home Edge Enabler Server
H-PCF: Home Policy Control Function
H-PCRF: Home PCRF
H-SFN: Hyper System Frame Number
H-SMF: Home SMF
H-UDR: A UDR in the HPLMN
HA: Home Agent
HA GNSS: High-Accuracy GNSS (RTK, PPP)
HAAT: Height Above Average Terrain
HAL: Hypertext Application Language
HAPS: High Altitude Platform Station
HARQ: Hybrid automatic repeat request
HARQ-ACK: Hybrid Automatic Repeat reQuest Acknowledgement