![]() ![]() ![]() It is more compact than the full format with underscore 1 because it doesn't include all options and, therefore, it trades off less scheduling flexibility for reduced control overhead. The format with underscores 0 is called the fallback format. This means it includes information about the way data was sent to the UE as discussed on the previous slide.įor both uplink and downlink information, there are two possible formats: one with underscore 0 and one with underscore 1. Format 0 is for uplink grant, meaning that it contains information that pertains to data the UE is about to transmit on the uplink. The user equipment needs to decode the DCI before they can decode downlink data or transmit uplink data.ĭepending on the content of a DCI, one or more of several formats can be used. It indicates the location in time and frequency of the data that is scheduled for transmission, the modulation and coding schemes used, the number of antenna ports or layers, as well as other aspects such as HARQ. It is carried by the PDCCH or physical downlink control channel. ![]() In the process, we will introduce the concepts of resource element groups and control channel elements.ĭownlink control information, or DCI, carries control information used to schedule user data, PDSCH on the downlink and PUSCH on the uplink. We will look at its content, how it is encoded and modulated, then mapped to the 5G New Radio slot via the PDCCH or physical downlink control channel. This is a new episode of our series, "5G Explained." In this video, we discuss downlink control information or DCI in 5G New Radio. ![]()
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