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In many applications, WSNs are deployed to monitor the impact of the forces of nature on the infrastructure safety, e.g. bridge collapse detection. It is very important for the routing to send surveillance results without any unnecessary delay, which can be caused by extra transmissions in a detour or an unexpected wait for the availability of the relay successor and the corresponding link connection. To reduce the waiting time in the neighbor synchronization, recent systems have adopted the asynchronous sleep-wake scheme.