Evaluation and Enhancement of IEEE 802.11p ...

VANETs are becoming more and more popular as a way to increase the traffic safety and comfort. The 802.11p standard has attracted much attention as part of the WAVE protocol in VANETs. Recently, many evaluations and enhancements have been proposed for the 802.11p standard. In this paper, the existing evaluations and enhancements of the 802.11p standard are first presented and classified. Subsequently, the present situations of the 802.11p standard are furthermore summarised based on the existing research works. Finally, five suggested research directions are proposed: (i) throughput improvement, (ii) scheduling optimisation, (iii) traffic control, (iv) channel estimation and equalisation, and (v) mobility affection.