  In this paper, we propose a network coding (NC) based approach to
ultra-reliable low-latency communication (URLLC) over erasure channels. In
transmitting multiple data packets, we demonstrate that the use of random NC
can improve the reliability in terms of decoding error probability, while it
incurs a longer decoding delay than a well-known K-repetition. To avoid a long
decoding delay, we consider a sliding NC (SNC) design that allows a highly
reliable transmission of each data packet with a guaranteed decoding delay. A
few design examples are derived and their decoding error rates are analyzed.
Through the analysis, we can show that the decoding error rate of SNC is much
lower than that of K-repetition at the same spectral efficiency, which means a
more reliable transmission can be achieved using SNC than K-repetition.
