Trust Based Congestion Control Algorithm (TBCCA) in VANET

Vehicular Ad Hoc network (VANET) is a promising technology mainly used to increase the safety of the vehicles, passengers, and etc. on the road. The safety and convenience services of VANET are supported through different type of messages. The high speed of vehicles results in the short time period available to exchange messages between the vehicles. All sorts of messages are broadcasted by the peer vehicles in the network, and those messages may causes channel overload, when vehicle density increases on the roads. In consequence of these, our channel gets highly congested which results in packet loss. The packet loss inside network is dangerous for many of VANET applications specially emergency noti cation services. It raises not only safety concerns but also results into degraded performance of VANETs. In our proposed algorithm Trust Based Congestion Control Algorithm (TBCCA), the priorities are computed independently in each vehicle for each message. Here a new trust parameter is considered in computation of message priority. The trust parameter is a ratio of sent and received messages, which determines how much a vehicle is contributing in congestion. The trust parameter not only aids in priority calculation but also helps in further broadcast of messages sent by trusted vehicles. Thus our algorithm controls congestion on the roads more efficiently. Our proposed algorithm has improved efficiency of VANET by controlling the congestion which reduced end to end delay by 7.778% and reduced packet loss by 8.333%. Our algorith also increased the throughput by 13.726%.