A method transmits a message of a source entropy from a source node, via a set of relay nodes, to a destination node, the set of relay nodes includes a node and a next node connected by a wireless link, wherein the next node is guaranteed to receive accumulated nats from one or more previous transmissions of the message, in which a transmission of the message from the node to the next node includes determining the accumulated nats guaranteed to be received by the next node; calculating minimal nats of the message to be transmitted from the node to the next node, such that a sum of the minimal nats and the accumulated nats is not less than the source entropy; and transmitting the message having the minimal nats from the node to the next node.