An apparatus including circuitry configured to define a spatial beam codebook of size NB on the basis of radiation patterns of an antenna array of a base station of a radio access network, which utilizes inter-radio-access technology, wherein each beam corresponds to a radiation pattern whose main lobe is uniquely directed to an angular direction with respect to the antenna array. The apparatus further includes circuitry configured to assign a spatial beam index from the spatial beam codebook for a candidate user equipment of the radio access technology; circuitry configured to assign a set of subcarriers for candidate user equipment of the radio access technology for each spatial beam index; and circuitry configured to use the assigned sets of subcarriers and spatial beam indices of the other radio-access-technology for one or more of resource pool partitioning, link-adaptation, and packet scheduling for the candidate user equipment.