Time division duplex (TDD) 5, 28, Self-contained subframe Time division multiple access (TDMA) Semi-persistent scheduling (SPS) Time sensitive networks (TSN) Semi-static power sharing Timing over packet (ToP) Service-based architecture (SBA) 68, 71, Traffic density 294, 497 Transmission time interval (TTI) 35, 90, Service data adaptation protocol (SDAP) Transmit precoder matrix indicator (TPMI) Service data flows (SDFs) Serving gateway (SGW) Transparent clock Shannon limit 257 Transport capacity Shared band Transport network layer (TNL) Sidelink 490 Turbo coding 41 Sigfox 450 Two-step RACH 471 Single carrier frequency division multiple access (SC-FDMA) 40 Single uplink operation (SUO) 354, 414 UE capability 146,184 Single-user MIMO Ultra reliable low-latency communication Site solution (URLLC) 2, 14, 17, 68, 218, 233, Slicing 4, 232 281, 464 Index Unified data management (UDM) Vertical beamforming Unified data repository (UDR) Virtual local area network (VLAN) United Kingdom (UK) Voice over LTE (VoLTE) 435,439 United States (US) 58, 61, 191 Universal subscriber identity module (USIM) Unlicensed band 50, 59, 462, Wake-up signaling (WUS) 434,457 Waveforms 39,250 Unlicensed coexistence W-band 52 Uplink grant Wi-Fi 61,463 Uplink sharing from UE perspective Wireless backhaul (ULSUP) 267 Use cases 9,18 User specific beams X2-interface 75,79 Xn-interface 75, 79 V-band 52 Vehicle-to-vehicle/vehicle-to-infrastructure Zero forcing (ZF) (V2X) 479,491 Zigbee 449 TOUGH CALLS AT&T and the Hard Lessons Learned from the Telecom Wars DICK MARTIN TOUGH CALLS AT&T and the Hard Lessons Learned from the Telecom Wars Dick Martin AMACOM AMERICAN MANAGEMENT ASSOCIATION NEW YORK ATLANTA BRUSSELS CHICAGO MEXICO CITY SAN FRANCISCO SHANGHAI TOKYO TORONTO WASHINGTON, D.C. Special discounts on bulk quantities of AMACOM books are available to corporations, professional associations, and other organizations. For details, contact Special Sales Department, AMACOM, a division of American Management Association, 1601 Broadway, New York, NY 10019. T