GEO Augmented Navigation GNSS or GPS disciplined OCXO Group Domain of Interpretation gigabit Ethernet Generation 1 (Option II quality levels) geostationary earth orbit GPS-Galileo time offset GLObalnaya NAvigazionnaya Sputnikovaya Sistema (Global Navigation GLONASS Satellite System) grandmaster Greenwich Mean Time gNB-CU gNodeB Central Unit gNB-DU gNodeB Distributed Unit next (5th) generation node B global navigation satellite system guard period gigabit passive optical network General Packet Radio Service Global Positioning System generalized precision time protocol (IEEE 802.1AS) Generic Requirement Global Navigation Satellite Systems Supervisory Agency (Europe) Global System for Mobile communications GSM Association Galileo System Time High Density Bipolar of Order 3 high dynamic range high definition television home eNB HetNet heterogeneous network high frequency hybrid fiber coax (cable system) keyed-hash message authentication codes high-pass filter hypothetical reference model High-Rate Packet Data HSDPA High Speed Downlink Packet Access High Speed Packet Access High-availability Seamless Redundancy HSUPA High Speed Uplink Packet Access Hypertext Transfer Protocol Implementation Agreement (MEF Forum) Internet Architecture Board IEEE Conformity Assessment Program inter-carrier interference inter-cell interference coordination information and communication technology Integrity Check Value International Electrotechnical Commission intelligent electronic devices IEEE SA IEEE Standards Association Institute of Electrical and Electronics Engineers International Earth Rotation and Reference Systems Internet Engineering Task Force Internet Group Management Protocol IGMPv3 Internet Group Management Protocol version 3 inclined geosynchronous satellite orbit International Mobile Telecommunication INRSS Indian Regional Navigation Satellite System interoperability IOS-XR Internet Operating System-XR edition Internet of things IP/MPLS Internet protocol/Multiprotocol Label Switching Internet protocol IPsec IP security In