DQ-EDCA: Dynamic Queue Management Based EDCA Mechanism for Vehicle Communication

As a new application of modern traffic, vehicle networks need to deal with more and more information which makes it urgent for messages to access the channel in an orderly and reasonable way. However, most of the existing message access mechanisms used static queue allocation, which cannot meet the current requirement of vehicle networks. In light of this, we propose an improved Enhanced Distributed Channel Access (EDCA) protocol of IEEE 802.11p called DQ-EDCA by introducing the dynamic priority queue management mechanism. DQ-EDCA can dynamically adjust priority queue allocation for data frames by prioritizing different message into a reasonable queue according to its access type and the real-time monitoring and pre-estimating the transmission delay, which can achieve the effects of sending important and urgent messages in a timely manner and preventing low real-time messages from being suspended for a long time. Finally, we evaluate the performance of throughput and transmission delay of the proposed scheme compared to other available schemes, and results show that the proposed scheme can improve the efficiency of the network significantly.