  In our work we focus on Robotic Mobile Fulfillment Systems in e-commerce
distribution centers. These systems were designed to increase pick rates by
employing mobile robots bringing movable storage units (so-called pods) to pick
and replenishment stations as needed, and back to the storage area afterwards.
One advantage of this approach is that repositioning of inventory can be done
continuously, even during pick and replenishment operations. This is primarily
accomplished by bringing a pod to a storage location different than the one it
was fetched from, a process we call passive pod repositioning. Additionally,
this can be done by explicitly bringing a pod from one storage location to
another, a process we call active pod repositioning. In this work we introduce
first mechanisms for the latter technique and conduct a simulation-based
experiment to give first insights of their effect.
