A method of dimensioning a data packets handler apparatus in a mobile communications network includes a plurality of cells, each one providing mobile communications coverage in a respective geographic area, the mobile communications network supporting packet-switched traffic and circuit-switched traffic, wherein the data packets handler apparatus to be dimensioned is associated with at least one cell of the mobile communications network. The method includes: obtaining an indication of radio communications resources of the at least one cell; obtaining an indication of an offered packet-switched traffic with respect to the at least one cell; and determining an amount of resources of the data packets handler apparatus potentially needed by the at least one cell for handling the packet-switched traffic based on the radio communications resources and on the offered packet-switched traffic.