Configured Grant Based URLLC Enhancement for Uplink Transmissions.

5G wireless systems are expected to support ultra-reliable and low latency communications (URLLC), which is featured in the stringent end-to-end requirements on reliability and latency. This paper develops an enhanced uplink URLL-C transmission scheme based on the configured grant (CG). In the proposed scheme, an explicit acknowledgment (ACK) is introduced to resolve the miss detection issue of the CG based uplink transmission. Furthermore, three sequence-based signaling methods are proposed for transmitting the explicit ACK signal. The link-level simulation results verify that 3~7.5 dB signal-to-noise ratio (SNR) gain can be attained compared with the Physical Downlink Control Channel (PDCCH) based ACK signaling method.