Existing cascading models are unable to depict the sink-convergence characteristic of WSNs (wireless sensor networks). In this\nwork, we build a more realistic cascading model for WSNs, in which two load-redistribution schemes (i.e., idle redistribution and\neven redistribution) are introduced. In addition, failed nodes are allowed to recover after a certain time delay rather than being\ndeleted from the network permanently. Simulation results show that the network invulnerability is positively correlated to the\ntolerance coefficient and negatively correlated to the exponential coefficient. Under the idle-redistribution scheme, the network\ncan have stronger invulnerability against cascading failures.The extension of the recovery time will exacerbate the fluctuation of\nthe cascading process.
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