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2026-10-20, Week 43 |
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ICACT20260349 Question.1
Questioner: gonghao23@mails.ucas.ac.cn 2026-02-24 오전 12:44:55 |
ICACT20260349 Answer.1
Answer by Auhor woosung@etri.re.kr 2026-02-24 오전 12:44:55
Chrome  Click!! |
| The proposed method relies on a Boolean active signal exported by the Communication FMU to trigger fast-mode execution. However, this assumes the protocol state machine is fully observable and correctly implemented within the FMU. How would the synchronization accuracy be affected if the active signal exhibits false negatives (i.e., the flag drops prematurely before retransmission timeouts expire), and what mechanisms could be introduced to make the mode-switching more robust to such signal inaccuracies? |
We acknowledge that relying on a single Boolean active signal may introduce sensitivity to signal inaccuracies. In particular, a false negative—where the active flag drops before retransmission timers or outstanding acknowledgments have fully expired—could prematurely trigger slow-mode execution, causing protocol events to be processed on the coarser step grid and introducing an additional delay bounded by the slow step size. To mitigate this effect, the active signal can be defined conservatively as a protocol-busy indicator that remains asserted while any retransmission timers, pending acknowledgments, or scheduled protocol events are outstanding, thereby structurally reducing the likelihood of false negatives. In addition, robustness can be further improved at the master level by introducing hysteresis mechanisms, such as a short grace period or multi-sample confirmation before switching back to slow mode, which prevents transient signal drops from affecting synchronization. Finally, the mode-switching decision can be cross-validated using auxiliary indicators (e.g., time to next protocol event or outstanding packet counters), ensuring that fast-mode execution is maintained whenever time-critical communication events are imminent, even if the Boolean signal itself is momentarily inaccurate. |
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