  Congestion control and avoidance in Wireless Sensor Networks (WSNs) is a
subject that has attracted a lot of research attention in the last decade.
Besides rate and resource control, the utilization of mobile nodes has also
been suggested as a way to control congestion. In this work, we present a
Mobile Congestion Control (MobileCC) algorithm with two variations, to assist
existing congestion control algorithms in facing congestion in WSNs. The first
variation employs mobile nodes that create locally-significant alternative
paths leading to the sink. The second variation employs mobile nodes that
create completely individual (disjoint) paths to the sink. Simulation results
show that both variations can significantly contribute to the alleviation of
congestion in WSNs.
