A method and managing device for allocating transmission resources in a wireless communications network for performing K individual transmissions between an access point and mobile terminals, signalling information for enabling the mobile terminals to determine transmission resources allocated in a subsequent frame being transmitted in at least one transmission resource of each frame, a managing device, when considering (S401) allocating transmission resources in a frame t: obtains (S402) information representative of transmission resources allocated beforehand from frame t−W−T+2 to frame t−1; allocates (S403) transmission resources in frame t for performing K individual transmissions and transmission resources in frame t−x for transmitting signalling information related to frame t, by reviewing transmission resources allocations from frame t−W+1 to frame t−1 by relying on a figure of merit representative of a probability that at least one message in each one of the K individual transmissions is correctly received.