Method for the bidirectional transmission of data, in particular sensor data, and radio-capable node

A method for transmitting data by radio between at least one battery-operated node and a base station in a communication system using bidirectional radio transmission operation, the method comprising:

• providing the base station with a communication module having a first frequency generator;
• providing the node with a communication module having a first frequency generator and a second frequency generator with a lower frequency than a frequency of the first frequency generator;
• using the communication module of the node to transmit the data to the communication module of the base station in an uplink by splitting a radio telegram into at least two or a multiplicity of uplink data packets transmitted successively at intervals of time;
• using the communication module of the base station to transmit the data to the communication module of the node in a downlink by splitting a radio telegram into at least two or a plurality of downlink data packets transmitted successively at intervals of time;
• and
• performing at least two calibrations for the first frequency generator and the second frequency generator of the node during a transmission period for a sum total of a succession of the uplink data packets and a subsequent succession of the downlink data packets including any period coming in between.