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    pdcch 5g pdcch pdsch 5g pdsch lte pdcch lte pdsch dci formats dci 0 pdcch in lte pdsch in lte pdcch lte dci formats in lte pdsch lte pdsch 5g pdcch 5g lte dci format 5g nr pdcch pdcch format physical downlink shared channel pdcch in 5g pdcch order in lte pdsch and pdcch 5g nr pdsch 5g nr dci format lte dci format 0

    5G PDCCH and 5G PDSCH

    5G PDCCH is used to carry Downlink Control Information (DCI), and following types of DCI are supported in NR.
    *  PDSCH assignments to convey TB(s) to a certain UE, including time/frequency-domain resource information
    *  PUSCH grants for a certain UE to transmit a TB, including time/frequency-domain resource information
    *  Slot format indication, where how each of symbols within a slot is indicated
    *  Pre-emption indication, which is used to inform UEs that there is no DL transmission on the informed time/frequency-domain resources
    *  UL transmit power control (TPC)
    *  Each device monitors a number of PDCCHs, typically once per slot although it is possible to configure more frequent monitoring to support traffic requiring very low latency. Upon detection of a valid PDCCH, the device follows downlink control information contained in the PDCCH, e.g., the scheduling decision so that the device receives PDSCH (or transmits PUSCH) accordingly.
    *  The PDCCHs are transmitted in one or more control resource sets (CORESETs). A CORESET spans overdone, two or three OFDM symbol(s) in time domain and over a configurable bandwidth in the frequency domain. This is needed in order to handle devices with different bandwidth capabilities and also beneficial from a forward-compatibility perspective. One control channel element (CCE) is defined as 6 resource element groups (REGs), where 1 REG is composed of 12 resource elements (REs). In a CORESET, a PDCCH with DM-RS can be mapped on one or more CCEs as shown in Figure. Different number of CCEs (aggregation level) provides different coding rate for the control channels.
    There are different formats for DCI transmitted on a PDCCH as shown in DCI Table. A UE monitors one or more PDCCH candidates for DCI with CRC scrambled by a certain RNTI in PDCCH common search space (CSS) set and/or UE-specific search space (USS) set. DCI format is distinguished by the PDCCH payload size and the RNTI scrambling the CRC.
    pdcch 5g pdcch pdsch 5g pdsch lte pdcch lte pdsch dci formats dci 0 pdcch in lte pdsch in lte pdcch lte dci formats in lte pdsch lte pdsch 5g pdcch 5g lte dci format 5g nr pdcch pdcch format physical downlink shared channel pdcch in 5g pdcch order in lte pdsch and pdcch 5g nr pdsch 5g nr dci format lte dci format 0
    General description of NR PDCCH

    NR DCI formats

    DCI format
    RNTI
    Notes
    DCI format 0_0
    RA-RNTI, TC-RNTI, C-RNTI, CS-RNTI
    Monitored on CSS or USS
    Scheduling PUSCH
    DCI format 0_1
    C-RNTI, CS-RNTI
    Monitored in USS
    Scheduling PUSCH
    DCI format 1_0
    SI-RNTI, RA-RNTI, P-RNTI, C-RNTI, CS-RNTI
    Monitored in CSS or USS
    Scheduling PDSCH
    DCI format 1_1
    C-RNTI, CS-RNTI
    Monitored in USS
    Scheduling PDSCH
    DCI format 2_0
    SFI-RNTI
    Monitored in CSS
    Indicating slot format for slot(s)
    DCI format 2_1
    INT-RNTI
    Monitored in CSS
    Indicating pre-emption of DL resource
    DCI format 2_2
    TPC-PUSCH-RNTI, TPC-PUCCH-RNTI
    Monitored in CSS
    Group-TPC command for PUSCH/PUCCH
    DCI format 2_3
    TPC-SRS-RNTI
    Monitored in CSS
    Group-command for SRS

    PDSCH is used to transmit one or two transport blocks (TBs). A DCI in a PDCCH can assign a PDSCH transmission with DM-RS (and other RS if any). The PDSCH is decoded based on the information in the PDCCH, for example, time/frequency-domain resource, modulation, and layer. PDSCH transmissions are processed with durations from 2 to 14 symbols. The number of layers for PDSCH transmissions is 8. HARQ feedback/retransmission is supported for PDSCH transmissions as mentioned in HARQ Post.

    Joni Tyagi

    Author & Editor

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