 describes the format of the various preambles of the long sequences. Subcarrier Number of Prefix duration Preamble Format Cell radius spacing repetition duration 1.25 kHz 100 us 800 us 14 km 1.25 kHz 680 us 1600 us 75 km 1.25 kHz 15 us 3200 us 28 km 5 kHz 100 us 800 us 108 km Table 4.13. The structure of a long PRACH sequence The performance metrics for preamble detection relate to the probability of detection and the probability of false alarms. The basic preamble can be repeated in the case of cells for which signal losses and/or interference are important. NG-RAN and 5G-NR Table 4.14 describes the format of the various short sequence preambles used in the FR1 and FR2 bands. Number of Number of slot repetition Prefix cyclic Preamble Format occasion in a duration TCP duration ( NRA dur RA ) 9.4 us 133 us 18.7 us 267 us 28.1 us 400 us 133 us 11.7 us 267 us 16.4 us 400 us 30.5 us 800 us 40.4 us 66,7 us 66.7 us 267 us Table 4.14. The structure of short PRACH sequences Forma Al Format A2 Format A3 Form it B1 Format B2 Format B3 Format B4 Fo rmat C1 ormat C2 1 slot (14 symbols per CP) Figure 4.21. The mapping of the DM-RS reference signal associated with short and long PUCCH 5G-NR Radio Interface - The Physical Layer 4.6.2.2. The physical PUCCH channel The physical PUCCH channel uses five types of format to transport UCI information. The type of format is chosen depending on the amount of information to be transported and the coverage of the cell. The NR PUCCH of short duration (Short PUCCH) is transmitted on one or two symbols and can carry one or two UCI bits (format 0) or several UCI bits (format 2), by transmitting the UCI symbols on several PRBs. UCI control data is multiplexed with descending or ascending data. The modulation used is of the QPSK type. The NR PUCCH of long duration (Long PUCCH) is transmitted over a longer duration, between 4 and 14 symbols. The modulation used is of the BPSK or QPSK type. Format Number of symbol/duration Number of UCI bits Number of PRB PUCCH SHORT/1-2 LONG/4-14 SHORT/1-2 LONG