A Dynamic Transmission Opportunity Allocation Scheme to Improve Service Quality of Vehicle-to-Vehicle Non-Safety Applications

摘要

Similar to IEEE 802.11e, the Wireless Access for Vehicular Environment (WAVE) uses the Enhanced Distributed Channel Access (EDCA) to provide service differentiation. Nevertheless, WAVE does not make use of the transmission opportunity (TXOP) parameter, i.e., only one packet can be transmitted per channel access. This fits well most safety applications as they usually transmit individual short messages. Yet, non-safety applications can witness a decline in their performance as they often transmit multiple long messages. In this paper, we propose an innovative scheme, called DTAS, that dynamically assigns TXOP limits to vehicles to improve non-safety applications' efficiency. DTAS targets vehicle-to-vehicle (V2V) communications and updates periodically its functionality to reflect changes in both network circumstances and mobility pattern between vehicles. To the best of our knowledge, no existing work has proposed something similar for V2V non-safety applications. Simulation results demonstrate that DTAS generates higher throughput compared to the conventional IEEE 802.11p.