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Virual Oral Question and Answer
IEEE/ICACT20260355 Question.8
Questioner: hejf@dsp.ac.cn    2026-02-05 오후 9:13:12 		IEEE/ICACT20260355 Answer.8
Answer by Auhor xueyy@dsp.ac.cn   2026-02-05 오후 9:13:12
Why is Raptor coding more suitable than an ACK/retransmission mechanism in a random-routing network? In a random-routing network, end-to-end delivery is highly unpredictable, so per-packet ACK/retransmission is hard to track reliably and adds extra RTT and control overhead. In contrast, with Raptor coding the receiver can decode once it collects enough coded packets within a window，and the sender can adapt redundancy 𝑟 using aggregate feedback such as the observed success ratio 𝑠𝑡 and decoding failure indicator failt，without requiring packet-level acknowledgments.

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