Methods, architectures, apparatuses and systems for downlink hybrid automatic repeat request (harq) operations with network coding

Abstract

Procedures, methods, architectures, apparatuses, systems, devices, and computer program products for downlink (DL) hybrid automatic repeat request (HARQ) reporting and network coding (NC) of DL transmissions. A set of service data units (SDUs) may be encoded by a NC process to obtain a plurality of NC protocol data units (PDUs). NC PDUs may be carried by physical downlink shared channel (PDSCH) transmissions to a wireless transmit/receive unit (WTRU). The WTRU may determine HARQ feedback information (e.g., ACK/NACK) for a PDSCH transmission based on physical layer decoding of the PDSCH transmission and NC-related information. For example, code block group (CBG)-based HARQ feedback may be generated based on the NC-related information and a number of NC PDUs or code blocks (CBs) that are incorrectly received. For example, a WTRU may generate HARQ feedback information to indicate the number of NC PDUs or CBs that need to be retransmitted for the PDSCH transmission.