 Single Frequency Network (SFN), 202 control, 166-167 Single Instruction Multiple Data (SIMD), receive, 166 174-176,257-258,312 transmit, 166 Single-Rate Tri Color Marking (srTCM), 99-100 Subcarrier spacing (SCS), 351 Slot-slot structure, 352 "SubPDUS", 223 Slow start, 100 Supplementary Uplink operation (SUL operation), Small cells, 354 69-70 "Smart Network Interface Card" (SmartNIC), Symbol duration/subcarrier spacing (SCS), 65 148-149 Sync equipment requirements, O-RAN, 296-298 Software Defined Approach, 158 Sync solution implementation, 298-302 Software defined solution, 154 designing PTP + SyncE solution, 302 Software optimization techniques, 257-260 frequency-only systems, 298-299 arg(max) vectorization, 258-260 time-synchronization systems, 299-302 Software optimization techniques, 322-327 Synchronization, 88-89, 269 Software performance, 309 O-RAN, 265-269, 273-290, 274f, 292 central processing unit loading summary, 319 network-based synchronization, 274-275 development environment optimization, packet time transport and precision time 321-322 protocol, 278-279 life-of-a-packet double data rate utilization physical-layer transport and synchronous analysis, 320 Ethernet, 275-278 mitigation techniques, 320-321 PTP, 279-289 packet processing cycle budget analysis, putting PTP and SyncE, 289-290 310-312 process, 285 physical layer complexity analysis, 313-318 Synchronization Signal Block (SSB), 88 software optimization techniques, 322-327 Synchronization Status Messages (SSMs), 277 system-on-chip performance counters, 319 Synchronous Ethernet (SyncE), 275-278, Software-defined networking (SDN), 1, 48, 350 289-290,294-296 deployment options including, 353-354, 353f asynchronous Ethernet clocking, 276f Software-defined radio (SDR), 5 Ethernet rate mismatch, 276f Sounding Reference Signal (SRS), 315 SyncE ESMC messaging, 277f SPECint, 178 SyncE propagation, 277f Spectral aspects, 355 Syntonization, O-RAN, 265-269 V2X spectrum allocation, 356f System dimensioning, 103 Spectrum, 8-14 System information (SI), 49 Spe