A Medium Access Control Protocol with Retransmission using NACK and Directional Antennas for Broadcasting in Wireless Ad-Hoc Networks

To improve the throughput performance keeping high reliable broadcasting, we propose an efficient Medium Access Control protocol for broadcasting in wireless ad-hoc networks with IEEE 802.11. In the proposed protocol, to reduce the number of retransmissions, a broadcast packet is retransmitted according to NACK instead of ACK. Moreover, the broadcast packet is retransmitted only to the area including nodes that request retransmission by using directional antennas. By computer simulations, we show that the proposed protocol can improve throughput performance keeping high reliable broadcasting compared with the BACK protocol. Especially, the proposed protocol 2 achieves the high throughput of 6, keeping the high success rate of data packet reception of approximately 0.7.