The present invention relates to a method for wireless transmission of data between components of a blood glucose system (1, I1) including a master controller (2, 2) having a receiver (10) and a transmitter (9), and at least one slave device (3) having a receiver (19) and a transmitter (18), and to a corresponding blood glucose system (1, I1) ~ The slave device (3) is normally operated in a power saving mode in which its receiver (19) is only activated intermittently at a receiver activation frequency for a predetermined listening period. The controller (2, 21) transmits a communication initiation data frame to the slave device (3) by means of a signal comprising a preamble signal transmitted for a preamble period. Upon receipt of the communication initiation data frame, the slave device (3) is switched to a communication mode in which it transmits a response to the controller (2, 21), and the slave device (3) is switched from the communication mode to the power saving mode. Initially the receiver activation frequency is set to a first frequency value upon switching from communication mode to power saving mode, and then to a second frequency value smaller than the first frequency value if no communication initiation data frame is received for a predetermined power saving timeout period. The communication initiation data frame is transmitted such that the preamble period exceeds the length of the cycle duration corresponding to the first frequency value, and, in case no response is received by the controller during the response period, the communication initiation data frame is adapted and retransmitted such that the preamble period is increased and exceeds the length of the cycle duration corresponding to the second frequency value.
