Abstract
Vehicular communications have been creating new applications in intelligent transportation systems (ITS) areas by converging information and communication technology (ICT) with automobile and road industries. In this paper, we introduce hybrid MAC scheme for vehicular communications which enhances the performance of IEEE 802.11p based communication system. The proposed MAC scheme supports high throughput by combining carrier sensing multiple access/collision avoidance (CSMA/CA) with TDMA. The benefits of proposed schemes are verified by simulations. In addition, we discuss some implementation issues including several application scenarios.
Highlights
Vehicular communications have been creating various communication services by combining communication technologies with existing automobile industry
By focusing on vehicular safety, standards for V2V and V2I communications have been developed in the 5.9 GHz frequency band, and the representative standard is referred to as wireless access in vehicular environments (WAVE) which consists of IEEE 802.11p for Physical Layer (PHY)/Medium Access Control (MAC) layers and IEEE 1609 family for higher layers
To improve the performance vehicular communication systems, hybrid MAC protocol is suggested in MAC layer, which supports access priority using time slot and carrier sensing multiple access/collision avoidance (CSMA/CA)
Summary
Vehicular communications have been creating various communication services by combining communication technologies with existing automobile industry. V2V-based vehicle ad hoc network (VANET) has attracted much attention for vehicle safety applications by automobile industry because of its standalone vehicle networking benefit without connecting infrastructure network. Its drawback in terms of packet transmission delay renders the performance of WAVE insufficient in vehicular communications. WAVE adopts CSMA/CA MAC protocol, which has good throughput in the case that the number of nodes is small. As the number of nodes increases, the throughput decreases dramatically, which results in long packet transmission delay. To overcome this drawback, we propose hybrid MAC scheme which combines CSMA/CA and TDMA.
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