With the ever-increasing call for connected vehicles and intelligent transportation applications, vehicular networking have been of significant focus recently. Demands for highly reliable communication challenge the current underlying technology and transformations in vehicular communication are discussed. The uMTC service of the next generation mobile networking system (i.e. 5G), which is based on D2D broadcast communication, is a promising enabler for broadcast-based C-ITS applications with strict reliability requirements. In this paper, we look at the resource management aspect of D2D communication technology to contribute to vehicular broadcasting with a higher level of reliability. In this regard, we propose a resource allocation scheme which is adaptive to the varying state of a vehicular network. With focus on the network load and topology as the main criteria, our scheme aims for management of the system capacity and interference situations, in order to meet the performance requirement of D2D vehicular broadcast, in terms of reliability. The results confirm the effectiveness of our approach and provide insight on the optimal network design regarding the allowed data rate and resource assignment according to application requirements.

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In the domain of vehicular networking, it is of significant relevance to be able to address vehicles based on their geographical position rather than the network address. The integration of geocasting (i.e. the dissemination of messages to all nodes within a specific geographical region) into the existing addressing scheme of the Internet is challenging, due to its logical hierarchy. One solution to Internet-based geographical addressing is eDNS, an extension to the DNS protocol. It adds support for querying geographical locations as a supplement to logical domain names. In this work, eDNS is extended with nearest neighbor resolution support, and further, a prototype server is developed that uses bounding box propagation between servers for delegation. Our experiments confirm that distributing location records over multiple servers improves performance.

The Intelligent Transportation Systems concept provides the ground to enable a wide range of applications to improve traffic safety and efficiency. Innovative communication systems must be proposed taking into account, on the one hand, unstable characteristics of vehicular communications and, on the other hand, different requirements of applications. In this paper a reliable (geo-)broadcasting scheme for vehicular ad-hoc networks is proposed and analyzed. This receiver-based technique aims at fulfilling the received message integrity yet keeping the overhead at a reasonably low level. The results are compared to simulation studies carried out in the Network Simulator-3 (NS-3) simulation environment demonstrating good agreement with each other. The analysis shows that in a single-hop scenario, receiver-based reliable broadcasting can provide good reliability, while giving very little overhead for high number of receivers.

Intelligent Transportation Systems (ITS), supporting the development of innovative vehicular applications, have benefited from major contributions in the field of wireless networking. Broadcasting is a crucial communication type for many domain-specific applications. In this work we focus on analytical modeling of multi-hop broadcast in vehicular networks and quantify its performance in terms of relevant indicators, by taking into account the effect of main parameters. Our model is based on the network topology and as a result, the major network characteristics such as vehicle density and the number of 1-hop neighbors, affecting dissemination penetration rate, are considered in the model. Through extensive experiments, confirming the substantial impact of the network topology and the connectivity regime on the overall broadcast performance, we provide insight into the system functionality. Such observations can be used as feedback for further performance optimization in various network conditions.