We propose a cumulative feedback-based ARQ (CF ARQ) protocol for a sliding
window of size 2 over packet erasure channels with unreliable feedback. We
exploit a matrix signal-flow graph approach to analyze probability-generating
functions of transmission and delay times. Contrasting its performance with
that of the uncoded baseline scheme for ARQ, developed by Ausavapattanakun and
Nosratinia, we demonstrate that CF ARQ can provide significantly less average
delay under bursty feedback, and gains up to about 20% in terms of throughput.
We also outline the benefits of CF ARQ under burst errors and asymmetric
channel conditions. The protocol is more predictable across statistics, hence
is more stable. This can help design robust systems when feedback is
unreliable. This feature may be preferable for meeting the strict end-to-end
latency and reliability requirements of future use cases of ultra-reliable
low-latency communications in 5G, such as mission-critical communications and
industrial control for critical control messaging.Comment: GLOBECOM'18. arXiv admin note: substantial text overlap with
arXiv:1806.0577