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With the phenomenal growth of the Internet of Things (IoT), Ultra ReliableLow Latency Communications (URLLC) has potentially been the enabler toguarantee the stringent requirements on latency and reliability. However, howto achieve low latency and ultra-reliability with the random arrival remainsopen. In this paper, a queue-aware variable-length channel coding is presentedover the single URLLC user link, in which the finite blocklength of channelcoding is determined based on the random arrival. More particularly, across-layer approach is proposed for the URLLC user to establish the optimaltradeoff between the latency and power consumption. With a probabilistic codingframework presented, the cross-layer variable-length coding can becharacterized based on a Markov chain. In this way, the optimal delay-powertradeoff is given by formulating an equivalent Linear Programming (LP). Bysolving this LP, the delay-optimal variable-length coding can be presentedbased on a threshold-structure on the queue length.

Queue-Aware Variable-Length Coding for Ultra Reliable Low Latency Communications with Random Arrival