Abstract
Vehicle-to-vehicle (V2V) communications also known as vehicular ad hoc networks (VANETs) allow vehicles to cooperate to increase driving efficiency and safety on the roads. In particular, they are forecasted as one of the key technologies to increase traffic safety by providing useful traffic services. In this scope, vehicle-to-vehicle dissemination of warning messages to alert nearby vehicles is one of the most significant and representative solutions. The main goal of the different dissemination strategies available is to reduce the message delivery latency of such information while ensuring the correct reception of warning messages in the vehicle’s neighborhood as soon as a dangerous situation occurs. Despite the fact that several dissemination schemes have been proposed so far, their evaluation has been done under different conditions, using different simulators, making it difficult to determine the optimal dissemination scheme for each particular scenario. In this paper, besides reviewing the most relevant broadcast dissemination schemes available in the recent literature, we also provide a fair comparative analysis by evaluating them under the same environmental conditions, focusing on the same metrics, and using the same simulation platform. Overall, we provide researchers with a clear guideline of the benefits and drawbacks associated with each scheme.
Highlights
In the past, the efforts of administrations to increase traffic safety were focused on building more efficient and safer roads
Considering the issues mentioned above, we focus on multihop broadcast schemes where vehicles behave in two different modes: warning mode vehicles, which are those directly detecting dangerous situations and acting as sources of safety messages, and normal mode vehicles, which act as message relays, allowing widespread dissemination of an event in the area of interest
Taking into account all the information related to the warning message dissemination mechanisms presented along this paper, we summarized in Table 3 the main pros and cons of the different broadcast dissemination schemes studied
Summary
The efforts of administrations to increase traffic safety were focused on building more efficient and safer roads. There are some important technical challenges to overcome, such as dissemination among vehicles, data delivery, high mobility and speeds of communicating vehicles, or real-time requirements Such challenges and opportunities justify the increasing interest in vehicular networks of carmakers, governments, industries, and academia [4]. After a collision is detected, the OBU will build a warning message using the data gathered by the sensors available in the vehicle All this information will be useful to make a preliminary assessment of the accident severity [7] and the human and material resources required to optimize the rescue process, improving the assistance quality [8].
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