5g DCI (Downlink Control Information)
DCI（下行链路控制信息）的主要用途与LTE中的DCI相同（如果您不太熟悉DCI的功能，我强烈建议您先阅读LTE DCI页面）。
也就是说，它是调度下行链路数据信道（例如PDSCH）或上行链路数据信道（例如PUSCH）的特殊信息集。
以下是38.212-7.3下行链路控制信息中定义的DCI类型及其内容.
DCI Format Usage
Format 0_0 Scheduling of PUSCH in one cell
Format 0_1 Scheduling of PUSCH in one cell
Format 1_0 Scheduling of PDSCH in one cell
DCI format 1_0 with CRC scrambled by C-RNTI
DCI format 1_0 with CRC scrambled by RA-RNTI
DCI format 1_0 with CRC scrambled by TC-RNTI
DCI format 1_0 with CRC scrambled by SI-RNTI
DCI format 1_0 with CRC scrambled by P-RNTI
Format 1_1 Scheduling of PDSCH in one cell
Format 2_0 Notifying a group of UEs of the slot format
Format 2_1 Notifying a group of UEs of the PRB(s) and OFDM symbol(s) where UE may assume no transmission is intended for the UE
Format 2_2 Transmission of TPC commands for PUCCH and PUSCH
Format 2_3 Transmission of a group of TPC commands for SRS transmissions by one or more UEs