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Innovative ways to use ad hoc networking between vehicles are an active research topic and numerous proposals have been made for applications that make use of it. Due to the bandwidth-limited wireless communication medium, scalability is one crucial factor for the success of these future protocols. Data aggregation is one solution to accomplish such scalability. The goal of aggregation is to semantically...
One often cited use case for vehicular networks are applications that relate to emergency vehicles. In addition to the traditional siren, they could use radio communication to warn other vehicles or to preempt traffic lights. Such an application can reduce accident risks during emergency response trips and also help save valuable time. We outline a comprehensive design of such an emergency vehicle...
Efficient information dissemination is one of the challenging tasks in most ad-hoc network application domains, be it in wireless sensor networks, mobile ad-hoc networks, or vehicular ad-hoc networks. It is obvious, that flooding has a high communication overhead, leading to channel congestion and packet collisions. Therefore, more efficient dissemination mechanisms were investigated and proposed...
Mechanisms for information dissemination are essential for many applications in vehicular ad-hoc networks (VANETs). Currently, simple flooding is often supposed to broadcast information within a geographic region, as for example in many geocast protocols. However, simple flooding has several drawbacks: every node rebroadcasting a message leads to redundancy, contention, and collision, to which is...
One major issue in vehicular ad-hoc networks (VANETs) is efficient information dissemination. Flooding is widely used in VANETs for this task, but it has severe drawbacks due to the high communication complexity. One class of algorithms to overcome these problems is gossiping, where each node forwards a message with a certain probability. The main challenge in gossiping is the proper determination...
Geocast refers to the distribution of messages within a geographic destination region. This makes it an important paradigm for the application to vehicular ad hoc networks (VANETs), because most safety-related information needs to be delivered to all vehicles in a certain area. As a central requirement for such safety applications, the protocol must be very robust against faults, regardless if caused...
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