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Reconnection strategies in WSN running RPL

The contribution of this article is two local recovery methods that may reduce overhead and make a more immediate reconnection of disconnected nodes compared to the soft state global recovery method applied in WSNs running RPL [1]. In addition, we perform an analysis of the implication to better judge the context where local recovery methods should be used. One of our suggested methods is based on reliable local repair and produces a complete connected network in 99.5% of the simulations. The overhead is in the same order of magnitude as applying the local recovery method suggested by J.Guo in [2]. However, the simulation shows that the J.Guo method has a worse reconnection percentage. Our second proposal is based on local-sequence number and creates high recovery overhead. However, it guarantees recovered network connectivity. Thus it makes periodic network recovery superfluous.