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This paper studies the performance of delay-constrained hybrid automaticrepeat request HARQ protocols. Particularly, we propose a fast HARQ protocolwhere, to increase the end-to-end throughput, some HARQ feedback signals andsuccessive message decodings are omitted. Considering quasi-static channels anda bursty communication model, we derive closed-form expressions for the messagedecoding probabilities as well as the throughput, the expected delay and theerror probability of the HARQ setups. The analysis is based on recent resultson the achievable rates of finite-length codes and shows the effect of thecodeword length on the system performance. Moreover, we evaluate the effect ofvarious parameters such as imperfect channel estimation and hardware on thesystem performance. As demonstrated, the proposed fast HARQ protocol reducesthe packet transmission delay considerably, compared to state-of-the-art HARQschemes. For example, with typical message decoding delay profiles and amaximum of 2,...,5 transmission rounds, the proposed fast HARQ protocol canimprove the expected delay, compared to standard HARQ, by 27, 42, 52 and 60%,respectively, independently of the code rate/fading model.

Fast HARQ over Finite Blocklength Codes: A Technique for Low-Latency Reliable Communication