科研之友
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摘要
To further utilize the idle time slots of the distributed TDMA (time division multiple address) for VANET (vehicular ad hoc networks), a distributed cooperative retransmission scheme, referred to as cooperative distributed TDMA (Co-DTDMA), is presented. Based on the broadcasting nature of wireless medium and the determinate way that the distributed TDMA accesses channel, nodes can interact with each other orderly and determinately in Co-DTDMA. When a node fails to transmit a packet, neighboring nodes exploit their idle slots for retransmitting the failed packet cooperatively, and thus the failed packet has more chance to be transmitted, without interrupting the normal packet transmissions. The cooperative retransmission does not rely on any central node, and is performed in a distributed manner, which makes it suitable for VANET. The numerical and simulation results demonstrate that Co-DTDMA significantly increases the probability of successful packet transmission, decreases the packet transmission delay and packet dropping rate, thus significantly increasing the network reliability.
