HYBRID AUTOMATIC REPEAT REQUEST (HARQ)-ACKNOWLEDGMENT (ACK) ENHANCEMENT FOR SEMI-PERSISTENT SCHEDULED (SPS) PHYSICAL DOWNLINK SHARED CHANNEL (PDSCH) IN AN UNLICENSED NEW RADIO SPECTRUM (NR-U): abstract simplified (18014719)
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The abstract describes a method of wireless communication using a user equipment (UE). The UE receives certain configurations for semi-persistent scheduling (SPS) and also receives transmissions on a physical downlink shared channel (PDSCH) for each of these configurations. These PDSCH transmissions do not have any associated physical downlink control channel (PDCCH). The UE then determines if it successfully decoded each of the PDSCH transmissions. Based on this determination, the UE generates a hybrid automatic repeat request (HARQ) codebook for the PDSCH transmissions. The HARQ codebook is transmitted in a physical uplink control channel (PUCCH) only when there is at least one acknowledgement (ACK) present in the HARQ codebook.
