Congestion control for safety messages in VANETs: Concepts and framework

Congestion control in packet data networks has been extensively studied. However, most algorithms are not directly applicable to safety messages in Vehicular Ad Hoc Networks (VANETs), which have stringent requirements on delay, reliability and dissemination area. Although certain algorithms have been investigated, there is still a lack of understanding on the related concepts, and there is no systematic analysis on different mechanisms in the overall context so far. This paper explores related concepts and their dependencies, makes a systematic analyse and presents a framework on congestion control for safety messages in VANETs.