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As air traffic grows significantly, aircraft accidents increase. Manyaviation accidents could be prevented if the precise aircraft positions andweather conditions on the aircraft's route were known. Existing studies proposedetermining the precise aircraft positions via a VHF channel with an air-to-airradio relay system that is based on mobile ad-hoc networks. However, due to thelong propagation delay, the existing TDMA MAC schemes underutilize thenetworks. The existing TDMA MAC sends data and receives ACK in one time slot,which requires two guard times in one time slot. Since aeronauticalcommunications spans a significant distance, the guard time occupies asignificantly large portion of the slot. To solve this problem, we propose apiggybacking mechanism ACK. Our proposed MAC has one guard time in one timeslot, which enables the transmission of more data. Using this additional data,we can send weather conditions that pertain to the aircraft's current position.Our analysis shows that this proposed MAC performs better than the existingMAC, since it offers better throughput and network utilization. In addition,our weather condition notification model achieves a much lower transmissiondelay than a HF (high frequency) voice communication.

Airborne TDMA for High Throughput and Fast Weather Conditions Notification