Described herein are base stations that may comprise a control module to segment a TB into one or more STBs, at least in part based on an ACK/NACK parameter, wherein a STB of the STBs may comprise one or more code blocks of the TB, and, to attach one or more first-level CRC bits to each of the STBs, and a transceiver to transmit the TB with the first-level CRC bits to a UE. Base stations may also comprise a transceiver to transmit a plurality of first code blocks and a first indicator to a UE, wherein the first indicator is further to indicate whether the first code blocks are new transmission blocks or not, and receive, from the UE, one or more ACK/NACK bits, and a control module to generate a second indicator to indicate whether the ACK/NACK bits have been correctly received by the base station or not.