determined according to the subcarrier spacing of SS/PBCH blocks as follows, where index 0 corresponds to the first symbol of the first slot in a half-frame [8]: Case A (SCS = 15 kHz): The first symbols of the candidate SS/PBCH blocks have indi- ces of {2,8} + 14n where n = 0, 1 for carrier frequencies fc < 3 GHz and n = 0, 1, 2, 3 for carrier frequencies 3 GHz V fc < 6 GHz. Case B (SCS = 30 kHz): The first symbols of the candidate SS/PBCH blocks have indi- ces {4, 16, 20} + 28n where n = 0 for carrier frequencies fc < 3 GHz, n = 0, 1 for car- rier frequencies 3 GHz VI fc < 6 GHz. Case C (SCS = kHz): The first symbols of the candidate SS/PBCH blocks have indi- ces {2,8} + 14n where n = 0, 1 for paired spectrum operation and carrier frequencies fc < 3GHz and n = 0, 1, 2, 3 for carrier frequencies 3 GHz fc < 6 GHz. For unpaired spectrum operation, = 0, 1 for carrier frequencies fc < 2.4 GHz, n = 0, 1, 2, 3 for car- rier frequencies 2.4 GHz fc < 6 GHz. Case D (SCS = kHz): The first symbols of the candidate SS/PBCH blocks have indices {4, 8, 16, 20} + 28n where n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18 for carrier frequencies fc 6 GHz. Case E (SCS = 240 kHz): The first symbols of the candidate SS/PBCH blocks have indi- ces {8, 12, 16, 20, 32, 36, 40, 44} + 56n where n = 0, 1, 2, 3, 5, 6, 7, 8 for carrier frequen- cies fc 6 GHz. In order to support multi-beam operation, particularly in high-frequency scenarios, NR introduced the SSB, which comprises primary and secondary synchronization signals and PBCH. As illustrated in Fig. 4.33, a given SSB is repeated within an SS burst set, which is potentially used for gNB beam-sweeping transmission. The SS burst set is confined to a 5 ms window and transmitted periodically. For initial cell selection, the UE assumes a default SS burst set periodicity of 20 ms. The main advantage of SS burst set is that SS block periodicity Frame = 10 ms Frame = 10 ms Frame = 10 ms Frame = 10 ms SSB Index (mapped to each beam) 0 Beams in space as UEs perceive them Signal streng