In this letter, we propose partial superposition for 5G hybrid automatic retransmission request (HARQ), resulting in a throughput-enhanced HARQ scheme for the 5G system. The novelty of the proposed scheme is to retransmit an erroneous packet by superimposing (XORing) its partial bits onto a fresh packet, costing no extra bandwidth and transmission power. The proposed HARQ schemes can be implemented with the basis of the hardware components of the 5G standard. Numerical results show that the proposed HARQ schemes can yield a throughput improvement up to 10% over the original 5G HARQ scheme.
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Wang et al. (2020) studied this question.
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