CH blocks to PRACH occasions mapping cycles within the association period, there is a set of PRACH occasions that are not mapped to N TX SSB SS/PBCH blocks; no SS/PBCH blocks are mapped to the set of PRACH occasions. An association pat- tern period includes one or more association periods and is calculated such that a pattern between PRACH occasions and SS/PBCH blocks repeats at most every 160 ms. The PRACH 620 Chapter 4 occasions that are not associated with SS/PBCH blocks after an integer number of association periods, if any, are not used for PRACH transmissions [8]. If a random-access procedure is initiated by a PDCCH command, the UE must transmit the PRACH preamble in the first available PRACH occasion for which the time interval between the last symbol of the PDCCH reception and the first symbol of the PRACH transmission is larger than or equal to TN2 + ABWP-Switching + Delay (in milliseconds), where TN2 is the equivalent time duration of N2 symbols corresponding to PUSCH preparation time assuming certain PUSCH processing capability, the parameter WP-Switching = 0, if uplink active BWP does not change, and A Delay = 0.5 ms for FR1 and Delay = 0.25 ms for FR2 [8]. The PRACH preamble transmission can occur within a configurable subset of slots known as the PRACH slots (see Fig. 4.82) that are repeated every PRACH configuration period. There may be multiple PRACH occasions within each PRACH slot in the frequency-domain N jPRACH-Preamble RB NPRACH consecutive resource blocks where N PRACH-Preamble cover preamble bandwidth measured in number of resource blocks and NPRACH is the number of frequency-domain PRACH occasions. For a given preamble type, corresponding to a certain preamble bandwidth, the overall available time-frequency PRACH resources within a cell can be described by the following parameters: a configurable PRACH periodicity that can range from 10 to 160 ms; a configurable set of PRACH slots within the PRACH period; a configurable frequency-domain PRACH resource given by the index of the first resour