Evaluation and Optimization of ETSI DCC Reactive Approaches for Platooning

Abstract: IEEE802.11p is considered as de facto standard for road communication. However, channel congestion is still the main challenge of IEEE802.11p based vehicular networks. Target to solve this issue, European Telecommunication Standards Institute (ETSI) has standardized a set of Decentralized Congestion Control (DCC) mechanisms in which mainly provide reactive and adaptive methods to mitigate communication channel congestion issue. Many efforts have been carried out over these years in order to solve this problem. Most of the results show that the DCC framework is capable of Channel Load (CL) control to some extend. Platooning system is one of these topics which needs to achieve reliable CL control, especially when there are large amount of vehicles communicating on the road. It is a pity that there are few papers of investigating on DCC framework for Platooning channel congestion control. For this purpose, we focus on investigating DCC reactive control approaches, aiming to provide comprehensive insights of how DCC framework transmission parameters, i.e. message generation rate, transmission power and datarate, will impact on the stability of Platooning system. Besides, for each instance of transmission parameter, we target to optimize the parameter, and propose more stable control algorithms by running repetitive simulations. According to our results, the method of adjusting transmission power has the best benefits.