Abstract

The VHF Data Exchange System (VDES) has been regarded as a typical paradigm in the Space-Air-Ground-Sea Integrated Networks (SAGSINs), providing information transmission services for marine transportation. The Multiple Access Control (MAC) protocol in VDES plays an important role in transmission performance. The traditional Automatic Identification System (AIS) suffers heavily from transmission collisions due to the Self-Organizing Time Division Multiple Access (SOTDMA) protocol which is employed as the MAC protocol. This paper proposes a Feedback based Time Division Multiple Access (FBTDMA) protocol for VDES to eliminate transmission collisions among vessels. Simulations are conducted to verify the performance of the proposed FBTDMA protocol. The results demonstrate that the FBTDMA protocol significantly reduces the collision rate and increases the throughput compared with the SOTDMA protocol.

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