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Virual Oral Question and Answer
IEEE/ICACT20260355 Question.3
Questioner: tanghr@dsp.ac.cn    2026-02-05 오후 8:55:02 		IEEE/ICACT20260355 Answer.3
Answer by Auhor xueyy@dsp.ac.cn   2026-02-05 오후 8:55:02
In the ARRCT control law, how do parameters λ (forgetting factor) and κ (failure penalty) affect the smoothness and responsiveness of redundancy adjustment? Why does a λ closer to 1 make the system smoother but potentially less responsive? In ARRCT, λ acts as an inertia/smoothing weight on the previous redundancy rt: as λ approaches 1, the update relies more on historical values and less on the latest observation st，o redundancy changes become smoother and less affected by instantaneous randomness, but the system may respond more slowly to sudden network changes; κ is a failure penalty that is applied when decoding fails (failt =1),pushing redundancy up more aggressively to quickly escape an under-provisioned regime and restore decodability.

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