Managing bandwidth resource for vehicular ad-hoc networks

Various vehicular applications are available in VANETs either for safety-related or non-safety-related use. Collision warning and car crash alerts are those of the most important messages that own high priority to be rebroadcast than any non-safety messages. Meanwhile among non-safety messages that employs text, images and streaming packets containing voices and videos, the bandwidth must be distributed fairly among users. In dense networks, massive rejections of packets may occur if there is no bandwidth resource management applied. This paper proposes a strategy in congestion control to increase bandwidth use and distribute fairness to various applications. In other words, the strategy provides suppressed rejection rates for safety messages and increases fairness on bandwidth use to the rest of applications. This research has shown an improved performance for safety applications and has increased fairness over non-safety applications when correct bandwidth partitioning is applied.