Computer-implemented method for optimizing an assignment of frequencies, f, to cells, C, of a mobile communications network, the cells, C, being distributed for communication within the mobile communications network, wherein the method comprises the following steps: - Specifying a set of unplanned cells in the mobile communications network, wherein an unplanned cell is a mobile network cell defined by the coverage area of an antenna, to which one or more frequencies is to be assigned to, - Specifying for each unplanned cell a set of frequencies, f, to be potentially assigned to this unplanned cell, characterised by: - Specifying frequency variables, x cf, wherein each frequency variable, x cf, is associated with one cell, C, within the mobile communications network and one frequency, f, for this cell, c, - Calculating frequency interference probabilities, p, of selected cell pairs, wherein each cell pair defines a relation of an unplanned cell to another cell, c, within the mobile communications network, wherein the interference probability is defined as a real valued function of frequency assignment x frequency assignment assigning to each cell pair of frequency assigned cells a probability for disturbance, - Formulating terms of a stress function, each term connecting a calculated frequency interference probability, p, of a respective cell pair with a frequency relation between the cells (2, c) of the respective cell pair, wherein the frequency relations in the terms of the stress function are formulated as combinations of selected frequency variables, x cf and the stress function is formulated as a quadratic unconstrained binary polynomial, - Determining, by using a quantum concept processor, an optimized assignment of frequencies (f) by selecting for each unplanned cell a sub-set of frequencies, f, from the respective set of frequencies, such that the stress function is minimized, by calculating the terms of the stress function, by using the quantum concept processor, to set the frequency variables, x cf such that the stress function is minimized. - Specifying a set of unplanned cells in the mobile communications network, wherein an unplanned cell is a mobile network cell defined by the coverage area of an antenna, to which one or more frequencies is to be assigned to, - Specifying for each unplanned cell a set of frequencies, f, to be potentially assigned to this unplanned cell, characterised by: - Specifying frequency variables, x cf, wherein each frequency variable, x cf, is associated with one cell, C, within the mobile communications network and one frequency, f, for this cell, c, - Calculating frequency interference probabilities, p, of selected cell pairs, wherein each cell pair defines a relation of an unplanned cell to another cell, c, within the mobile communications network, wherein the interference probability is defined as a real valued function of frequency assignment x frequency assignment assigning to each cell pair of frequency assigned cells a probability for disturbance, - Formulating terms of a stress function, each term connecting a calculated frequency interference probability, p, of a respective cell pair with a frequency relation between the cells (2, c) of the respective cell pair, wherein the frequency relations in the terms of the stress function are formulated as combinations of selected frequency variables, x cf and the stress function is formulated as a quadratic unconstrained binary polynomial, - Determining, by using a quantum concept processor, an optimized assignment of frequencies (f) by selecting for each unplanned cell a sub-set of frequencies, f, from the respective set of frequencies, such that the stress function is minimized, by calculating the terms of the stress function, by using the quantum concept processor, to set the frequency variables, x cf such that the stress function is minimized. - Specifying frequency variables, x cf, wherein each frequency variable, x cf, is associated with one cell, C, within the mobile communications network and one frequency, f, for this cell, c, - Calculating frequency interference probabilities, p, of selected cell pairs, wherein each cell pair defines a relation of an unplanned cell to another cell, c, within the mobile communications network, wherein the interference probability is defined as a real valued function of frequency assignment x frequency assignment assigning to each cell pair of frequency assigned cells a probability for disturbance, - Formulating terms of a stress function, each term connecting a calculated frequency interference probability, p, of a respective cell pair with a frequency relation between the cells (2, c) of the respective cell pair, wherein the frequency relations in the terms of the stress function are formulated as combinations of selected frequency variables, x cf and the stress function is formulated as a quadratic unconstrained binary polynomial, - Determining, by using a quantum concept processor, an optimized assignment of frequencies (f) by selecting for each unplanned cell a sub-set of frequencies, f, from the respective set of frequencies, such that the stress function is minimized, by calculating the terms of the stress function, by using the quantum concept processor, to set the frequency variables, x cf such that the stress function is minimized.