关键词: 移动自组网, 车载自组网, 时分多址（TDMA）, 可靠性

Abstract: The main drawback of the distributed TDMA (time division multiple access) protocol in vehicular ad hoc networks (VANET) is the failure to fully utilize wireless channel resources, such as node idle time slots. Aiming at the fact that the VANET has no central node and the network topology changes rapidly, a cooperative relaying distributed TDMA (CR-DTDMA) method is proposed to cooperatively relay data using idle time slots of the nodes. CR-DTDMA implements a network handshake protocol to determine cooperative relay nodes, independent of the relevant data transmission confirmation mechanism. The control information of the network handshake protocol is transmitted by the message piggyback mechanism, and no special control package needs to be sent. Theoretical analysis and simulation results show that CR-DTDMA significantly improves the data relay forwarding probability and reduces the relay forwarding delay and packet loss rate.

Key words: mobile ad hoc networks, vehicular ad hoc networks, time division multiple access (TDMA), reliability