A Novel Adaptive SR-SW-ARQ/FEC Scheme for an Ultra Low-Latency Mobile Network

To realize an ultra low-latency mobile network that has a quite short end-to-end latency, we present an adaptive error recovery scheme. In the proposed scheme, a combination of selective repeat (SR) and stop-and-wait (SW) ARQ (automatic repeat request), is adopted at the link layer. In addition, an adaptive FEC (forward error correction) scheme that has a different redundancy rate depending on the number of retransmissions is adopted at the physical layer. Theoretic analyses show that the proposed SR-SW-ARQ has a shorter transmission latency than that of the conventional SW-ARQ protocol when the error rate is sufficiently low. Simulations of the proposed adaptive SR-SW-ARQ/FEC scheme were conducted based on the flat Rayleigh channel. The simulation results verify that the proposed scheme provides better performance in terms of a normalized throughput at the link layer and less transmission latency compared to a scheme that has a static redundancy FEC scheme and SR-SW-ARQ protocol