Directional-transmission-based solution for hidden and exposed terminal problems in inter-vehicular network

The intrinsic problem of hidden/exposed terminals in inter-vehicular networks may bring about communication conflicts and decrease network throughput. In this paper, we take the unidirectional feature of road into consideration, and design a single-channel transmission scheme for decreasing communication conflicts with nodes´ position information and directional antennas. The scheme includes the identification and notification of relative positions among adjacent nodes, the identification of nodes´ transmission state, and the scheduling of directional transmissions. By simulation experiments in NS-2, we verify that this scheme can discern hidden/exposed terminal nodes, decrease communication conflicts, and improve network performance.