Vehicular ad-hoc networks (VANETs) are an emerging new technology which is the focus of lot of ongoing research and projects.[12],[13] It aims at providing ubiquitous connectivity to mobile users and effective communication between vehicles on dynamic mobility. VANETs have various applications among them being passing information among vehicles about traffic and roadside conditions. The simulator uses the protocol to pass messages between the vehicles. There are methods to compute possibilities of collisions based on these messages. If collision is detected, the method to avoid them is called. Collision detection and avoidance methods are discussed in section 5.
[...] This has been demonstrated through figures. If a vehicle changes its speed in response to some other vehicle, it prepares an update message which contains its new position and speed information and broadcasts it to its neighbors. This is required so that the vehicles following current vehicle adjust their speeds accordingly. V. COLLISION DETECTION AND AVOIDANCE We have demonstrated the working of our protocol and simulation model by implementing advanced collision detection and avoidance features in the simulation model with the help of the protocol. [...]
[...] Collision detection and avoidance methods are discussed in section 5. III. SIMULATION MODEL DESIGN There are many network simulators which can simulate Fig Simulation Environment mobile ad-hoc networks like ns-2 and Omnet++. These simulators contain wireless and mobility frameworks for simulating vehicular ad-hoc networks. However, it becomes IV. PROTOCOL CHARACTERISTICS IV. difficult demonstrate visually vehicular traffic and to show collision detection and avoidance features in these simulators. Here we have used a custom made simulation environment in For our simulation model, we have developed an application Java programming language using Java Swings for graphical layer Location Aware protocol inspired by Vehicular Information Transfer Protocol (VITP) Our protocol is user interface. [...]
[...] These include highly dynamic topology due to rapid node movement frequently disconnected networks especially at low vehicular densities (iii) possibility of predicting next positions of nodes as vehicles are constrained by pre defined highways different types of communication environments hard delay constraints like is case of providing traffic information to drivers possible interaction with on board sensors for providing information etc.[9] In this paper we discuss a simulation model which demonstrates advanced collision detection and avoidance features in vehicular ad-hoc networks. [...]
[...] In such cases detecting and avoiding collision is important for development of automated traffic control system. VIII. FUTURE WORK Fig.6: No of messages when vehicles = 30 In our initial model we have focused only on the problem and not the efficiency of the protocol. So the future work will consist of Improving the efficiency of protocol by minimizing the number of messages passed so that under heavy load conditions the bandwidth must not be consumed in message passing and not on vehicles. [...]
[...] From these figures, it is clear that the protocol is running smoothly and the no of messages passed reflect the actual traffic closeness and density. VII. CONCLUSION Fig.5: No of messages when vehicles = 20 In this paper we have developed a simulation model for demonstrating InVANETs. We have focused on the problem of problem of possible collisions between the vehicles. This problem can be solved by providing timely information to each vehicle about the neighboring vehicles and based on that information the vehicle can dynamically adjust its parameters like speed and route. [...]
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