/4-14 1-6, 8-10, 12, 15, 16 LONG/4-14 Table 4.15. PUCCH format Format 0 carries one or two UCI bits as an acknowledgment or a sequencing request. UCI 0-0 format is the default format which supports basic 5G-NR functionality and UCI 0-1 is the non-fallback format to support flexible configurations when RRC reconfiguration requests. Format 2 takes the CSI information into account: - the short PUCCH physical channel (short PUCCH) is transmitted on the last or the last two symbols of the slot and carries the positive ACK or negative NACK acknowledgment of the data received on the physical PDSCH channel, corresponding to the HARQ mechanism for low communication URLLC (Ultra-Reliable Low-Latency Communication); - the long physical PUCCH channel (Long PUCCH). The formats 1, la and 1b transport the UCI information relating to the scheduling request to obtain the resource on the physical PUSCH (Physical Uplink Shared Channel). NG-RAN and 5G-NR The 2, 2a and 2b formats carry UCI information relating to the status report of the signal received on the physical PDSCH and to the positive ACK or negative NACK acknowledgment. Format 3 carries the same information as Format 1 by adapting it to the aggregation of DC radio channels. At the uplink level, the physical PUSCH channel uses OFDM or DFT-S-OFDM modulation. In order to reduce the options on the physical PUCCH channel, formats 0, 1, 3 and 4 use the DFT-S-OFDM modulation and format 2 uses the OFDM format. In the time domain: - the PUCCH format 0 and format 2 physical channels are generally transmitted on the last symbol of the slot, even if another position is possible; - the PUCCH format 1, format 3 and format 4 physical channels are transmitted on several consecutive symbols, on the same subcarrier or on two different subcarriers in the event of frequency hopping. Compared to format 3, format 4 accepts code multiplexing (CDM) between the different UEs. Format 0 Format 1 without frequency hopping Format 2 Format 3 without frequency hopping Figure 4.22. The NR PUCCH format as