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7015109 
Journal Article 
A Priority-Based Cross-Layer Design for Future VANETs Through Full-Duplex Technology 
Zang, J; Towhidlou, V; Shikh-Bahaei, MR; , 
2020 
Yes 
IEEE Transactions on Vehicular Technology
ISSN: 0018-9545 
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC 
PISCATAWAY 
69 
7 
7531-7544 
WOS:000549318100053 
Among all requirements for vehicle-to-everything (V2X) communications, successful delivery of packets with small delay is of the highest significance. Especially, the delivery of a message before a potential accident (i.e. emergency message) should be guaranteed. In this work, we propose a novel cross-layer design to enhance the delivery of emergency messages so that accidents can be further avoided. Particularly, in the PHY layer, imperfect full-duplex (FD) simultaneous transmitting and sensing is analysed and dynamic thresholds for determining the channel status before and during transmissions are mathematically formulated. Then a novel FD MAC protocol, named priority-based multiple access (PBMA), based on prioritised messaging between different vehicles is proposed. Average collision probability, collision duration, waiting time as well as successful delivery rate of the system are formulated too. The delivery performance of emergency messages is also mathematically derived. In addition, comparisons have been made among three different mechanisms. Benchmark is the DSRC standard which uses half-duplex (HD) technology with enhanced distributed channel access (EDCA) protocol. We also compare our proposed protocol with FD EDCA. Simulations have verified the accuracy of our analysis. They have also illustrated the delivery of emergency messages has been enhanced by deploying our proposed design. 
Cams; Sensors; Media Access Protocol; Accidents; Standards; Manganese; Full Duplex; DSRC; V2X; VANETs; IEEE 802; 11p; connected vehicles