regated gNB deployment, Cross-polarization interference Dense Urban-eMBB test 26-27 cancelation (XPIC), 96-97, environment, 39, 44-45, Disaggregation, 26-28 291-292 48, 307-309 Discontinuous reception (DRX), Cross-polarized signal components, Densification of wireless networks, 43, 138, 169, 171, 200, 291-292 55-56 206, 255-258 CSI-RS resource indicator (CRI), Deployment models, 853-856 Discovery reference signals (DRS), Deployment scenarios, Cumulative adjacent channel 158-164 Distributed antenna system (DAS), leakage ratio (CACLR), Extreme Long Distance 55-57 685-686 deployment scenario, 49 Distributed coordination function Cumulative distribution function Destination layer-2 ID, 839 (DCF), 857, 859-862 (CDF), 39-40, 321-322, Device energy efficiencey, 46 Distributed CRC polar code (D- Device-to-device (D2D), 80 CRC polar code), 523 Customer-facing service (CFS), communications, 22 Distributed interframe space 104-105 D2D-based positioning (DIFS), 857 techniques, 55-58 Distributed unit (DU), 26-27, mode, 792 30-32, 36 technology, 791 Distributed unit of logical gNB Data converters, 711 Device-to-network mode, 792 (gNB-DU), 26-27, 119, 121 Data network (DN), 143 DFT-spread OFDM (DFT-S- ID, 132 name, 149 OFDM), 346-347, 353 UE F1AP ID, 132 Index 917 Diverse user interactions, 14-15 CSI measurement and reporting, E1 control-plane functions and dl-UL-TransmissionPeriodicity 496-509 procedures, 121-122 parameter, 389 hybrid ARQ operation and Earthquake and Tsunami Warning Doherty amplifier, 725 protocols, 539-550 System (ETWS), 238 Domain name system (DNS), 36, PDSCH, 487-496 eCPRI, 32-33, 63. See also 105-106 reference signals, 413-432 Common Public Radio Doppler frequency component, synchronization signals, Interface Forum (CPRI 477-487 Forum) Doppler power spectrum, 296 Downlink pilot time slot (DwPTS), characteristics, 77 Doppler shift, 311, 589 895-896 specification, 78-81 Doppler spread, 292-293, 295 Downlink shared channel (DL- transport, 76-77 angular spread, 295-296 SCH), 138, 200 eCPRI radio equipment Doub