Method for allocating resources (44) within a grid (40) of time and frequency for communication in a radio communications system under a first protocol, comprising determining an indication of a frequency resource range (43) to be allocated for data communication between a base station and a device within the first radio protocol; determining that a predetermined frequency resource (42) within said range is pre-allocated to communication under a second radio protocol; allocating a frequency resource (44) for the communication in the first radio protocol which overlaps and excludes said predetermined frequency resource for that data communication.