Binned feedback from receiving device to network encoder

A method of wireless communication, comprising, at a network coding (NC) encoding device:

• receiving, via a radio transceiver, a first transmission of a transport block from a first device;
• receiving, via the radio transceiver, a plurality of acknowledgments (ACK) or negative acknowledgments (NACK) for the transport block on a plurality of physical sidelink feedback channel (PSFCH) resources from a plurality of user equipment (UEs), each of the PSFCH resources associated with a bin of UEs that transmit the ACK or NACK on a same resource;
• decoding the PSFCH resource for each bin to determine an ACK or NACK status for each bin;
• and
• determining whether to encode the transport block in a NC combination packet with at least one other transport block based on the ACK or NACK status for each bin;
• and
• transmitting, via the radio transceiver, the NC combination packet.

An apparatus for wireless communication at a user equipment (UE), comprising:

• a radio transceiver;
• a memory storing computer-executable instructions;
• and
• at least one processor communicatively coupled with the memory and the radio transceiver and configured to execute the instructions to:
• determine for each transport block of a plurality of transport blocks transmitted by at least one other UE on a sidelink channel whether to transmit an acknowledgment (ACK) or a negative acknowledgment (NACK) based on whether the UE correctly decoded the transport block;
• transmit, via the radio transceiver, the ACK or the NACK for each transport block of the plurality of transport blocks on a physical sidelink feedback channel (PSFCH) resource selected based on a bin of the UE for the transport block and transmit the ACK or the NACK on a same resource, wherein at least two UEs are assigned to the bin;
• and
• receive, via the radio transceiver, a combination packet from a network coding (NC) encoding device, the combination packet including an encoding of two of more of the plurality of transport blocks that were transmitted by the other UEs;
• and
• decode a transport block for which the NACK was transmitted based on the transport block and the combination packet.

An apparatus for wireless communication at a network coding (NC) encoding device, comprising:

• a radio transceiver;
• a memory storing computer-executable instructions;
• and
• at least one processor communicatively coupled with the memory and configured to execute the instructions to:
• receive, via the radio transceiver, a first transmission of a transport block from a first device;
• receive, via the radio transceiver, a plurality of acknowledgments (ACK) or negative acknowledgments (NACK) for the transport block on a plurality of physical sidelink feedback channel (PSFCH) resources from a plurality of user equipment (UEs), each of the PSFCH resources associated with a bin of UEs that transmit the ACK or NACK on a same resource;
• decode the PSFCH resource for each bin to determine an ACK or NACK status for each bin;
• and
• determine whether to encode the transport block in a NC combination packet with at least one other transport block based on the ACK or NACK status for each bin;
• and
• transmit, via the radio transceiver, the NC combination packet.