6k2-r 5 X 2048k2 - 864k2-11 2 2X2048k2-" 216k2-H 4 X 2048k2 -4 3602-u 6 X X 2048k2 - 504k2- 12 X 2048k2 - 936k2- 1 X2048k2 12402-H 4 X2048k21 20482- 618 Chapter 4 unrestricted sets and restricted sets of Type A and Type B, while short sequences support unrestricted sets only. Considering network beam-sweeping reception within a RACH occasion, NR introduced a new set of PRACH preamble formats of shorter sequence length of 139 on 1, 2, 4, 6, and 12 OFDM symbols and subcarrier spacings of 15, 30, 60, and 120 kHz. The new formats are composed of single or consecutive repeated RACH sequences. The cyclic prefix is inserted at the beginning of the preambles, and the guard time is appended at the end of the preambles, while the cyclic prefix and gap between RACH sequences is omitted. For both short and long PRACH preamble sequences, the network can also conduct beam-sweeping reception between RACH occasions. Multiple RACH preamble formats are defined with one or more PRACH symbols, and dif- ferent cyclic prefix and guard time lengths. The PRACH preamble configuration is signaled to the UE in the SI. The UE calculates the PRACH transmit power for the retransmission of the preamble based on the most recent estimate of pathloss and power ramping counter. If the UE conducts beam switching, the counter of power ramping remains unchanged. The SI informs the UE of the association between the SS blocks and the RACH resources. The threshold of the SS block for RACH resource association is based on the RSRP and is net- work configurable. Prior to initiation of the physical random-access procedure, the physical layer of the UE must receive a set of SS/PBCH block indices and provide the UE RRC sublayer with the corresponding set of RSRP measurements conducted on those SS/PBCH candidates. The information required for the UE physical layer prior to PRACH transmission includes PRACH preamble format, time resources, and frequency resources for PRACH transmission as well as the parameters for determining the root sequences and their cycl