Fast synchronization scheduling apparatus and method for time slotted channel hopping in congested industrial wireless network environment

A fast synchronization scheduling method for Time Slotted Channel Hopping (TSCH) in a congested industrial wireless network environment, the fast synchronization scheduling method comprising steps of:

• (a) measuring, whether an RSSI value is found to exist in each of channels;
• (b) in response to no RSSI value being found to exist among all the channels as a result of the measurement in the step (a), repeating the step (a);
• (c) detecting RSSI values from two of all the channels when an RSSI value is found to exist in each of the channels as a result of the measurement;
• (d) measuring, Channel Quality Estimation (CQE) values of the respective channels by putting the received RSSI values of the respective channels into a CQE formula, and sorting the channels in order of highest CQE value (a highest channel quality) based on the measured CQE values;
• (e) searching for coordinators in a surrounding area using an advertisement packet (ADV) received from an ADV receiver, setting a number of the found coordinators and a good group, and delivering information about channels having high CQE values to a Personal Area Network (PAN) coordinator;
• (f) generating, when a time slot for an ADV is allocated to each coordinator on the basis of the information delivered from the PAN coordinator and timeslot information is received by the coordinator, an ADV message and transmitting the generated ADV message in a designated channel during the time slot;
• and
• (g) selecting, when an ADV is not received by the time a predetermined number of slotframes have passed, a channel having the highest CQE value again on the basis of CQE values collected by that time, and returning to step (c) and proceeding with the subsequent steps.