Notification by energy burst of messages with unacceptable quality

A method comprising the steps of:

• transmitting a data message comprised of a multiplicity of data frames to a plurality of communication units;
• receiving the data message by the plurality of communication units;
• determining, by each of the plurality of communication units, whether the quality of each frame of the received data message is acceptable;
• when at least one of the plurality of communication units determines that at least two frames of the received data message are of unacceptable quality, transmitting, by the at least one of the plurality of communication units, an energy burst in a predetermined time window and in, multiplicity of frequency band divisions. wherein each of the multiplicity of data frames corresponds to one of the multiplicity of frequency band divisions and wherein at least two of the energy burst transmissions are simultaneous.

A communication unit comprising:

• a receiver for receiving a data message transmitted in multiple frames;
• a determiner, operatively coupled to the receiver, for determining whether the quality of each of the multiple flames of the received data message is acceptable;
• and
• a transmitter, operatively coupled to the determiner, for simultaneously transmitting in a predetermined time window an energy burst in a different frequency window for each different frame that is of unacceptable quality when it is determined that two or more frames of the received data message is of unacceptable quality.