MLB

MLB is about using capacity you already have. When one cell is congested while a neighbour on the same site sits half-empty, MLB shifts some of that traffic over — it doesn't add resources, it redistributes load. The usual mechanism is nudging handover thresholds (cell individual offsets, and in idle mode the reselection parameters) so that UEs near the edge are encouraged onto the lighter cell, or pushed onto another carrier entirely in a multi-layer network.

The interaction with MRO is the gotcha worth remembering. MLB wants to move the handover boundary to balance load; MRO wants to keep that same boundary set for clean mobility. Push the offsets too far for load reasons and you start generating the too-early handovers and ping-pong that MRO is trying to kill. Well-behaved SON coordinates the two so load balancing doesn't quietly wreck mobility KPIs. MLB tends to give the biggest wins in dense, multi-layer areas — a stadium, a busy transit corridor — where there's genuinely idle capacity on an adjacent layer to soak up the overflow.