Protocol Sequence Allocation Based On Geographic Location In VANET

As one of the important components of Intelligent Transportation System, Vehicle Ad Hoc Networks provide a communication platform for the transmission of interactive data, making the originally isolated vehicles and roads closely linked and thus forming a wireless communication network. Media Access Control protocol has a significant impact on the performance of VANET. However, resulting from the frequent changes of the network topology and high speed of nodes in VANET, great challenges have brought to the related research. Therefore, how to realize the efficient, fair and reliable channel access has become the important goal of MAC protocol in VANET. Based on the research to Vehicle Ad Hoc Networks MAC protocol, this paper puts forward corresponding improvement schemes which make the Protocol Sequence as entry point.In this paper, we firstly give a brief introduction to Protocol Sequence. Then combining the uniqueness of node location in highway with the characteristics of node motion, we propose the location-based Protocol Sequence MAC protocol (PS-MAC) in VANET. The simulation experimental results show that the PS-MAC is superior to STDMA in terms of delay of access channel, the occurrence probability of hidden node and continuous packet loss rate.Besides, we analyze the current research situation to Clustering Algorithm in VANET. Then based on clustering and Protocol Sequence (CPS-MAC) in VANET we propose the MAC protocol. The experimental results illustrate that the performance of CPS-MAC is superior to CM-MAC in terms of average throughput of safety message and average delay of non-safety messages.