A sending node (405) is adapted for communication with several receiving nodes (410, 420) by transmitting information in the form of a regular data packet to at least one intended receiving nodes, said sending node comprising—means to receive, identify and store a priori information in feedback from receiving nodes (410, 420); —means (905) for forming a composite data packet from at least two regular data packets, said means arranged to use a priori information from said a priori information storage module (910) and to determine which multiple individual data packets to retrieve from a buffer module (920) for use in the composite data packet, said means being arranged to form a composite data packet from which the intended receiving node for each of the at least two regular packets can decode the composite packet to obtain at least one packet intended for it.