URLLC: ultra-reliable low latency communications
Short packet communication is used to support URLLC. For a given coding rate, errors can not be arbitrarily low because of the limited packet size. Hence, error probability is bound for BL and coding rate. BLER increases as BL decreases ==> latency increases. BLER = no of erroneous blocks/ Total no of blocks. OP is good for relaying performances. The achievable rate depends on BL and BLER. Channel dispersion: Measuring stochastic variability of the channel as compared to a deterministic channel having equal capacity.