Systems and methods for physical channel repetition for low latency communication
An apparatus is configured for a next Generation NodeB (gNB). The apparatus comprises baseband circuitry and/or application circuitry which includes a radio frequency (RF) interface and one or more processors. The one or more processors are configured to determine a transmission mode for a user equipment (UE) device; dynamically determine a repetition level sequence for a physical downlink shared channel (PDSCH) based on a transmission time interval (TTI) and the transmission mode; generate repetition level signaling for the determined repetition level sequence; and provide the generated repetition level signaling to the RF interface for transmission to the UE device.
1. An apparatus for a base station, comprising baseband circuitry having:
a radio frequency (RF) interface; and
one or more processors configured to:
dynamically determine a repetition configuration for a physical downlink shared channel (PDSCH), wherein the repetition configuration includes a number of PDSCH repetitions, a cycling sequence of redundancy versions (RVs), and an indication which RV of the cycling sequence of RVs to employ with an initial PDSCH;
generate repetition level signaling for the determined repetition configuration, wherein the repetition level signaling comprises the initial PDSCH and one or more PDSCH repetitions for transmission to a user equipment (UE) using the RF interface, the cycling sequence of RVs for the initial PDSCH and the one or more PDSCH repetitions, and an RV field that indicates a starting index of the cycling sequence of RVs,
wherein the one or more processors configure initial resource blocks (RBs) for the initial PDSCH and repetition RBs for the one or more PDSCH repetitions, and wherein the one or more processors configure initial rate matching for the initial RBs and repetition rate matching for the repetition RBs based on UE decoding probability; and
provide the generated repetition level signaling to the RF interface for transmission to the UE.
2. The apparatus of claim 1 , wherein the repetition configuration is configured within a downlink control information (DCI) field.
3. The apparatus of claim 2 , wherein the DCI field indicates the determined repetition configuration based on sub-frame, slot, and/or subslot.
4. The apparatus of claim 1 , wherein the generated repetition level signaling is a physical downlink control channel (PDCCH).
5. The apparatus of claim 4 , wherein the PDCCH includes a DCI field to indicate the generated repetition level signaling.
6. The apparatus of claim 1 , wherein the generated repetition level signaling is provided by a radio resource control (RRC) configuration.
7. The apparatus of claim 1 , wherein the repetition rate matching is a same mode as the initial rate matching.