Mass mobility signaling congestion avoidance mechanism using randomized time distribution of cell reselections

This paper presents a novel mechanism which avoids wireless cellular radio access network congestion caused by signaling traffic simultaneously generated by many mobile phones. It applies to the Mobility Management (MM) signaling of the Radio Resource Management (RRM) protocol (cell update procedure). It uses a cell reselection algorithm which decides on which cell UE is camped on when in idle mode (there is no active radio connection with a mobile network). By using a randomized delay of the cell reselection process in different mobile phones, the mechanism improves the overall performance of the Mobility Management protocol in hotspot cell scenarios. A potential benefit of the proposed method is estimated based on a mathematical model with some examples.