 240-242, 247-250, 262, 267, F1-U (F1 User-Plane) 141, 144, 154, 164, 279, 281, 286-292, 332, 385, 394, 395 178-180, 182-184, 186, 243, 250, 252, GNSS (Global Navigation Satellite System) 209, 236, 248, 259, 267, 271, 274, 358 F1AP (F1 Application Protocol) 141, GoS (Grade of Service) 383 145, 149, 151-155, 184, 186, 187, 256 GP (Guard Period) FCS (Frame Check Sequence) 202, 354 GPL (General Public License) 31, 296, 299 FDD (Frequency Division Duplexing) GPON (Gigabit Passive Optical Network) 259, 260, 267 Index GPRS (General Packet Radio System) 41, 50, IMS (IP Multimedia Subsystem) 39, 40, 44, 57, 62, 79, 98, 141, 155, 255 GPU (Graphic Processing Unit) 288 IMT-2020 (International Mobile GSA (Global Mobile Suppliers Association) Telecommunications-2020) 5, 8, 12, 20-24, 26, 32, 35, 98 GSMA (GSM Association) 28, 279, 293, 311, Inactive state 60, 65, 70, 73-75, 80, 88, 89, 95-98, 124, 152, 153, 263 GTP (GPRS Tunneling Protocol) 41, Indoor coverage 213-215, 221, 229 70, 74, 75, 82, 87, 141, 151, 154, 164, Initial access 85, 89, 97, 104-107, 149, 174, 185, 188, 243, 286, 291, 366-368, 181-183, 185-187 370, 374 Intra-PHY 3, 136, 142, 193 GTP-U (GPRS Tunneling Protocol User IOC (Information Object Class) 331, 333 Plane) 62, 69, 70, 75, 82, 141, 151, IoT (Internet of Things) 154, 164, 243, 366, 374 28, 32, 33, 39, 50, 192, 257, 258, 260, 296, 300, 308, 325, 338, 341, 349, 354, 373, 380-385, 390 HAPS (High Altitude Platforms) 257-259, IPR (Intellectual Property Rights) 267, 268, 272-274 ISG (Industry Specification Group) 308, 324 HARQ (Hybrid ARQ) 76, 83, 85, 109-111, ITS (Intelligent Transport Systems) 17, 308, 135, 147, 200, 247, 260, 264, 268, 269, 313, 315, 319, 321 274, 287, 291, 348, 353, 392 ITU (International Telecommunication HEO (High Elliptical Orbit) 258, Union) 5, 7, 9-13, 20-23, 28, 35, 36, HetNet (Heterogeneous Network) 214, 231 54, 58, 257, 272, 273, 276, 303, 324, HFN (Hyper Frame Number) 351, 352, 356, 358-361, 367, 369-373, 376, 377 HPLMN (Home Public Land Mobile ITU-R (ITU Radiocommunication Sector) 