Techniques and apparatus disclosed herein include methods for allocating data sessions among two radio access networks (RANs), as might be carried out in a network management node operatively connected to one or more network nodes in each of a first RAN and a second RAN, where the first and second RANs have overlapping coverage areas. An example method includes receiving (401) current data session information and network performance information for each of the first and second RANs, from the one or more network nodes, and computing (402) a reallocation of data sessions among the first and second RANs, based on the performance information and configuration data for the first and second RANs, using a metaheuristic algorithm. The method further includes triggering (403, 404) a transfer of one or more current data sessions between the first and second RANs, based on the computed reallocation.