V2V QoS Guaranteed Channel Access in IEEE 802.11p VANETs

Che Yu Chang, Hsu Chun Yen, Der Jiunn Deng

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


IEEE 802.11p Wireless Access in the Vehicular Environment (WAVE) has been serving as the de facto wireless protocol for a Vehicular Ad hoc Network (VANET) with the explosive growth of vehicular applications. These applications require guaranteed Quality-of-Service (QoS). However, the fundamental channel access mechanism of WAVE, Enhanced Distributed Channel Access (EDCA), is not able to provide guaranteed QoS due to the unpredictable random access. To remedy this problem, we propose a novel channel access scheme, called Earliest Deadline First based Carrier Sense Multiple Access (EDF-CSMA). EDF-CSMA based on EDCA dynamically adjusts the priority of real-time streaming to avoid collision and introduces an admission control policy according to time constraints to provide guaranteed QoS in multi-channel environments. An analytical model is carried out to study and compare the channel utilization of EDF-CSMA and QoS-aware Hybrid Coordination Function (HCF) controlled channel access (HCCA) method. The result shows that 60 percent of channel utilization is improved by EDF-CSMA. Additionally, real video-based simulations are conducted to evaluate the performance of EDF-CSMA and the existing EDCA method. The results show that EDF-CSMA reaches better QoS support than EDCA while maintaining efficient channel utilization.

Original languageEnglish
Article number7031428
Pages (from-to)5-17
Number of pages13
JournalIEEE Transactions on Dependable and Secure Computing
Issue number1
Publication statusPublished - 2016 Jan 1

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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