Method of operating a communication system that comprises a master node and at least two slave nodes (SN1-SN4) and is operated in a time-division multiplexing technique, wherein - the communication is carried out in consecutive time frames, which each comprise at least one transmission subframe and at least one auxiliary subframe which is scheduled after the transmission subframe, - wherein the transmission subframe comprises at least one downlink slot for transmission of downlink data packets from the master node to the slave nodes (SN1-SN4), and at least one uplink slot (US1-US4) for transmission of uplink data packets from each of the slave nodes (SN1-SN4) to the master node, - wherein the master node sends downlink data packets to all or at least a subset of the slave nodes (SN1-SN4) during the downlink slot, and each of the slave nodes (SN1-SN4) sends at least one uplink data packet to the master node during its respective uplink slot (US1-US4), - wherein the master node evaluates the uplink data packets that were received from the slave nodes (SN1-SN4) during the uplink slots (US1-US4) of the transmission subframe, and generates a retransmission schedule that defines a re-transmission of uplink and/or downlink data packets (UDP, DDP) in the auxiliary subframe in case of an unsuccessful reception of due uplink data packets from slave nodes (SN1-SN4) in the respective uplink slot (US1-US4) or in case that uplink data packets received from the slave nodes (SN1-SN4) indicate an unsuccessful reception of downlink data packets during the previous downlink slot, and - wherein prior to the first re-transmission of uplink and/or downlink data packets (UDP, DDP) in the auxiliary subframe, the master node broadcasts the retransmission schedule to the slave nodes (SN1-SN4), characterized in that - the re-transmission schedule defines at least one slave node (SN1-SN4) that is requested to re-transmit the re-transmission schedule before the beginning of or during the auxiliary subframe. - the communication is carried out in consecutive time frames, which each comprise at least one transmission subframe and at least one auxiliary subframe which is scheduled after the transmission subframe, - wherein the transmission subframe comprises at least one downlink slot for transmission of downlink data packets from the master node to the slave nodes (SN1-SN4), and at least one uplink slot (US1-US4) for transmission of uplink data packets from each of the slave nodes (SN1-SN4) to the master node, - wherein the master node sends downlink data packets to all or at least a subset of the slave nodes (SN1-SN4) during the downlink slot, and each of the slave nodes (SN1-SN4) sends at least one uplink data packet to the master node during its respective uplink slot (US1-US4), - wherein the master node evaluates the uplink data packets that were received from the slave nodes (SN1-SN4) during the uplink slots (US1-US4) of the transmission subframe, and generates a retransmission schedule that defines a re-transmission of uplink and/or downlink data packets (UDP, DDP) in the auxiliary subframe in case of an unsuccessful reception of due uplink data packets from slave nodes (SN1-SN4) in the respective uplink slot (US1-US4) or in case that uplink data packets received from the slave nodes (SN1-SN4) indicate an unsuccessful reception of downlink data packets during the previous downlink slot, and - wherein prior to the first re-transmission of uplink and/or downlink data packets (UDP, DDP) in the auxiliary subframe, the master node broadcasts the retransmission schedule to the slave nodes (SN1-SN4), characterized in that - the re-transmission schedule defines at least one slave node (SN1-SN4) that is requested to re-transmit the re-transmission schedule before the beginning of or during the auxiliary subframe.