A node comprising a transmitter for sending data packets over a time-multiplexed channel and a receiver for receiving data packets over a time-multiplexed channel, said node belonging to a self-organizing network being structured according to a tree topology, wherein nodes on the same layer use only the time slots that are provided for that layer based on a synchronization signal received by the layers above said layer, said receiver comprising: a time slot analyzer for checking on whether during a time slot of a current frame or during at least one corresponding time slot of a preceding frame, data packets from more than one transmitter have been received, wherein the layer and hence the time slots provided for this layer are determined on the basis of an analysis of received synchronization data packets transmitted by neighboring nodes or nodes in layers above; a time slot information generator for generating time slot information indicating whether the time slot or the corresponding time slot of at least one of the preceding frames contains data packets from more than one transmitter; a time slot information transmission means for transmitting the time slot information; said transmitter comprising: a time slot selector for selecting a time slot for sending a data packet based on the received time slot information; and a subslot selector for selecting a subslot among at least two separate, non-overlapping subslots at separate times within the selected time slot, wherein the subslots represent possible data packet time positions within the time slot and wherein the subslot is selected anew for at least every i th data packet; wherein the time slot selector is configured to check, on the basis of the time slot information, to ascertain whether a selection of another time slot is necessary for sending future data packets and then to implement this selection, if necessary; and wherein the transmitter is configured for sending the data packet in the selected time slot and during the selected subslot within the selected time slot. a time slot analyzer for checking on whether during a time slot of a current frame or during at least one corresponding time slot of a preceding frame, data packets from more than one transmitter have been received, wherein the layer and hence the time slots provided for this layer are determined on the basis of an analysis of received synchronization data packets transmitted by neighboring nodes or nodes in layers above; a time slot information generator for generating time slot information indicating whether the time slot or the corresponding time slot of at least one of the preceding frames contains data packets from more than one transmitter; a time slot information transmission means for transmitting the time slot information; said transmitter comprising: a time slot selector for selecting a time slot for sending a data packet based on the received time slot information; and a subslot selector for selecting a subslot among at least two separate, non-overlapping subslots at separate times within the selected time slot, wherein the subslots represent possible data packet time positions within the time slot and wherein the subslot is selected anew for at least every i th data packet; a time slot selector for selecting a time slot for sending a data packet based on the received time slot information; and a subslot selector for selecting a subslot among at least two separate, non-overlapping subslots at separate times within the selected time slot, wherein the subslots represent possible data packet time positions within the time slot and wherein the subslot is selected anew for at least every i th data packet; wherein the time slot selector is configured to check, on the basis of the time slot information, to ascertain whether a selection of another time slot is necessary for sending future data packets and then to implement this selection, if necessary; and wherein the transmitter is configured for sending the data packet in the selected time slot and during the selected subslot within the selected time slot.