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Adaptive Aggregated Multi-Process Transmission for LEO Satellites Integrated with 5G

The integration of 5G new radio (NR) and low earth orbit (LEO) satellite communication is a new trend for next-generation non-terrestrial networks. However, with limited satellite resources and long propagation delay, the communication performance is seriously degraded. Inspired by the enhancement on the HARQ process number and aggregated transmission, in this paper, we introduce an adaptive HARQ scheme for LEO satellite communication systems to improve throughput with relatively low delay. We first study the effect of multi-process HARQ and aggregated transmission. Subsequently, a multi-process transmission scheme is designed, which adjusts the aggregation configuration adaptively according to the block error rate (BLER). Therein, the number of HARQ processes is determined by subcarrier spacing and signal propagation delay. Simulation results show that the proposed adaptive HARQ scheme achieves higher throughput and lower delay compared to traditional HARQ schemes.