Transmission method and node device implementing said method with limited maximum use time on a sliding time window

A transmission method for transmitting an Internet Protocol (IP) packet from a first node device to a second node device belonging to a network neighbourhood of the first node device, the first and second node devices belonging to an electrical supply network and being configured for transmitting the IP packet by powerline and by radio frequency, a use of the transmission by radio frequency being, at each node device, limited to a maximum use time (macDutyCycleLimit_RF) on a sliding time window, wherein the transmission method causes the first node device to perform, in the case where the IP packet is not fragmented:

• transmitting the IP packet by radio frequency in the case where a level of use (macDutyCycleUsage_RF) by the first node device of the radio frequency transmission calculated on the sliding time window with respect to the maximum use time is below a first threshold (lowDutyCycleUsageForParallelisation), said first threshold being a threshold below which it is considered that transmission by radio frequency has been very little used, and said first threshold being below a second threshold (macDutyCycleThreshold_RF) beyond which any transmission by radio frequency is interrupted;
• transmitting the IP packet by powerline otherwise, and, in the case where the powerline transmission fails, transmitting the IP packet by radio frequency in the case where the level of use (macDutyCycleUsage_RF) is below the second threshold (macDutyCycleThreshold_RF).