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IEEE/ICACT20260355 Question.6 Questioner: yangyn@dsp.ac.cn 2026-02-05 오후 9:06:07	IEEE/ICACT20260355 Answer.6 Answer by Auhor xueyy@dsp.ac.cn 2026-02-05 오후 9:06:07
The results in Figure 7 show that ARRCTs speedup advantage becomes significant only for data sizes above 20MB. What causes this threshold effect, and how does the feedback overhead impact small-scale transmissions?	In Fig. 7, this “20 MB threshold” is mainly because ARRCT introduces extra state evaluation and closed-loop feedback per round, and when the data block is small (e.g., 1–10 MB) the baseline transmission time is already short, so this fixed/near-fixed overhead becomes noticeable and can even offset the benefit of adaptive redundancy—hence the speedup stays around 1 or dips slightly below 1. As the data size grows, that overhead is amortized, while static redundancy increasingly mismatches the time-varying network conditions, causing avoidable overhead; therefore, beyond ~20 MB the adaptive scheme’s advantage becomes consistently significant.

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