RDAPT: A Ratio-Difference-Based Anti-packet Triggering Method for Vehicular DTNs
摘要
This paper introduces Ratio-Difference-based Anti-packet Triggering (RDAPT) method for vehicular Delay/Disruption Tolerant Networking (DTN). In RDAPT, nodes compare the ratio of duplicate bundles with that of observed bundles when receiving summary vectors. If the difference exceeds a threshold of 0.7, an anti-packet is generated; otherwise, the bundle is retained. Unlike conventional schemes in which only destinations issue anti-packets, RDAPT enables intermediate nodes to adaptively regulate recovery, thereby improving responsiveness to network dynamics. Simulations were conducted in Scenargie under different vehicle densities with considering Epidemic and Spray and Wait (SpW) routing. Results show that RDAPT combined with Epidemic achieves lower overhead than DTAG and conventional anti-packet schemes without introducing additional delay.While RDAPT combined with SpW consistently maintains delivery ratios above 0.9, substantially outperforming DTAG, but has moderately higher overhead. The evaluation results show that RDAPT offers a more balanced approach to anti-packet control, improving delivery robustness while effectively managing overhead in vehicular DTNs.