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New Radio (NR) is a new radio air interface developed by the 3rd GenerationPartnership Project (3GPP) for the fifth generation (5G) mobile communicationssystem. With great flexibility, scalability, and efficiency, 5G is expected toaddress a wide range of use-cases including enhanced mobile broadband (eMBB),ultra-reliable low-latency communications (URLLC), and massive machine typecommunications (mMTC). The physical downlink control channel (PDCCH) in NRcarries Downlink Control Information (DCI). Understanding how PDCCH operates iskey to developing a good understanding of how information is communicated overNR. This paper provides an overview of the 5G NR PDCCH by describing itsphysical layer structure, monitoring mechanisms, beamforming operation, and thecarried information. We also share various design rationales that influence NRstandardization.

Understanding the Heart of the 5G Air Interface: An Overview of Physical Downlink Control Channel for 5G New Radio (NR)