Patent ID: 8559366
Filing Date: 2013-10-15
Classification: H04L,H04W

Abstract:
1. Method of communication, on a radio channel, between at least two nodes, the method comprising: emitting by the two nodes on the channel in an alternating manner and listening by the two nodes to the radio channel intermittently, such that the nodes are in an active radio listening mode at brief and periodic wakeup moments of determined duration, spaced out by long inter-waking periods, during which they are in an inactive radio listening mode; determining a signal transmission error probability on the channel; selecting a transmission mode as a function of at least the determined transmission error probability, wherein: the transmission mode is selected from at least a first and a second mode of formulating a signal comprising a preamble and a data frame, the preamble comprising a series of frames which comprises at least one first frame indicating a number of frames of the preamble separating the first frame from the data frame and furthermore indicating the mode selected, the format of the signal in the formulation of the second mode is the same as that in the first mode with the exception that the at least one first frame in the preamble of the signal formulated in accordance with the first mode comprises a copy of the data frame, and at least one first frame in the preamble of the signal formulated in accordance with the second mode comprises a signature of the data frame and being of reduced size with respect to the data frame; the method further comprising: formulating, by one of the two nodes, termed the emitter, of the signal; emitting, by the said emitter node, of the signal thus formulated on the radio channel; wherein: the preamble of the signal is of a duration greater than or equal to a duration separating a start of two consecutive periodic wakeup moments and a duration of the wakeup moments is equal to a duration of said at least one first frame formulated in accordance with the first mode.