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IEEE/ICACT20260196 Slide.15        [Big Slide]	Oral Presentation
	Research on CoAP retransmission and reliability control can be broadly classified into several technical directions, each addressing a specific performance aspect but leaving gaps in adaptability and duplication mitigation(Issue or problem not addressed). Early CoAP implementations static or exponential backoff timers [4], fail to capture variable delay charac？teristics in dynamic wireless networks. Later studies adopted adaptive timers based on RTT estimation and variance mod？eling [1O]. For example, timer calculation was optimized for Low-Power Wide-Area Networks (LPWANs) [11]. However, such approaches impose additional computational overhead and memory requirements that are unsuitable for constrained nodes. To address this, our approach introduces a single？ parameter EWMA model that achieves timer adaptability with minimal complexity and bounded RTO limits.

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