Wireless Pers Commun DOI 10.1007/s11277-014-2152-x Reducing Multi-hop Wireless Delay for High-Priority Applications in Vehicular Wireless Networks Kuo-Lung Wang · Tsan-Pin Wang · Chien-Chao Tseng © Springer Science+Business Media New York 2014 Abstract Vehicular wireless networks (VWNs) offer both high-priority safety and low- priority non-safety applications. In VWNs, the high-priority applications are urgent. Trans- mitting urgent information demands low delay and high bandwidth. When the traffic is heavy, how to reduce the multi-hop wireless delay will be critical for urgent information. In this paper, we propose a blocking strategy to preempt the transmission of low-priority vehicles and to decrease the number of contending vehicles. Thus, the multi-hop wireless delay of high-priority vehicles will be greatly reduced even if the traffic is heavy. Moreover, we also propose a mathematical model to evaluate the performance of the proposed strategy and com- pare the existing strategy. Performance results show that the proposed strategy can reduce the multi-hop wireless delay significantly. Keywords Vehicular wireless networks · IEEE 802.11p · Multi-hop delay 1 Introduction Vehicular wireless networks (VWNs) consist of vehicle-to-vehicle and vehicle-to-infrastruc- ture communications based on IEEE 802.11p technology [1]. The VWNs offer multi-hop wireless communications between vehicles and Road Side Units (RSUs) and can transmit and receive hazard warning or information of the current traffic situation to ensure driving safety. For reducing deployment cost, the distance between two RSUs could be long, so K.-L Wang · C.-C Tseng Department of Computer Science, National Chiao Tung University, Hsinchu 300, Taiwan, ROC e-mail: klwang@csie.nctu.edu.tw C.-C Tseng e-mail: cctseng@cs.nctu.edu.tw T.-P. Wang (B ) Department of Computer Science, National Taichung University of Education, Taichung 403, Taiwan, ROC e-mail: tpwang@mail.ntcu.edu.tw 123