OMAMRC transmission method and system with slow link adaptation under BLER constraint

A method for transmitting consecutive messages forming a frame for a telecommunication system. The system has M sources, optionally L relays, and a destination, M≥2, L≥0. An orthogonal multiple-access multiple-relay channel scheme is used between the M sources and the L relays with a maximum number of M+T max time intervals per transmitted frame, including M intervals allocated during a first phase to the consecutive transmission of the M sources and T used intervals for at least one cooperative transmission allocated during a second phase to at least one node selected according to a selection strategy. T used≤Tmax. The link adaptation implemented by the destination is slow and maximizes average utility metrics under constraint of an average individual BLER for each source. The utility metrics include average spectral efficiency tied to the strategy for selecting the nodes intervening during the second phase.