No abstract

Abstract-ISO TC204 and ETSI TC ITS are developing a set of standards for Cooperative ITS (Cooperative Intelligent transportation Systems) which will allow ITS stations i.e. vehicles, the road infrastructure and other peers reachable through the Internet to cooperate and exchange information with one another in order to enhance road safety, traffic efficiency and comfort for all road users. In situations where the exchange of information has to transit through the Internet, the use of IP, more specifically IPv6, is crucial and meets ITS needs for reliable and scalable communication capabilities in vehicular networks. An implementation of Cooperative ITS communication protocols is necessary to validate extensively the ETSI and ISO Cooperative ITS standards. In this paper, we describe CarGeo6, an ongoing open-source implementation of the IPv6 GeoNetworking capabilities of the ITS station reference architecture based on the output of the GeoNet European Project. CarGeo6 combines IPv6 and GeoNetworking capabilities into a common protocol stack for the transmission of IPv6 packets into a given geographical area. This paper reports the validation process and the network performance evaluation of CarGeo6 as well as a comparison of these results with GeoNet results.

No abstract

This paper aims to propose a new solution for failure recovery (dead-ends) in Vehicle to Vehicle (V2V) communications through LTE-assisted Device-to-Device communications (D2D). Based on the enhanced networking capabilities offered by Intelligent Transportation Systems (ITS) architecture, our solution can efficiently assist V2V communications in failure recovery situations. We also derive an analytical model to evaluate generic V2V routing recovery failures. Moreover, the proposed hybrid model is simulated and compared to the generic model under different constrains of worst and best cases of D2D discovery and communication. According to our comparison and simulation results, the hybrid model decreases the delay for alarm message propagation to the destination (typically the Traffic Control Center TCC) through the Road Side Unit (RSU). Keywords-Vehicular Networks VANET; ITS; Modeling; D2D Communication I. THE HYBRID ARCHITECTUREPure vehicular communications also known as V2V can suffer from blocking or failure: 'dead-ends' [1]. This is mainly due to geographical guidance errors, communication range being too short, or dynamicity in the topology.

Abstract-In the recent years, many solutions for Vehicle to Vehicle (V2V) communication were proposed to overcome failure problems (also known as 'dead-ends'). This paper proposes a novel framework for V2V failure recovery using Device-to-Device (D2D) communications. Based on the unified Intelligent Transportation Systems (ITS) architecture, LTE-based D2D mechanisms can improve V2V 'dead-ends' failure recovery delays. This new paradigm of hybrid V2V-D2D communications overcomes the limitations of traditional V2V routing techniques. According to NS2 simulation results, the proposed hybrid model decreases the end to end delay (E2E) of messages delivery. A complete comparison of different D2D use cases (best & worst scenarios) is presented to show the enhancements brought by our solution compared to traditional V2V techniques. Keywords-Vehicular Networks VANET; Intelligent Transportation Systems; D2D communicationsI. INTRODUCTION Pure Vehicular communications also known as V2V can suffer from blocking or failure issues called 'dead-ends ' [1]. This is mainly due to geographical guidance errors, insufficient communication range, or topology dynamicity. Hence, unrelayed V2V messages will block the whole communication process. The V2V communication is used either to disseminate local information in the VANET domain or to relay it to the nearest Road Side Unit (RSU), which will transmit it to ground servers and Traffic control Centers (TCC). The Intelligent Transportation Systems (ITS) communication architecture standardized by ETSI and ISO [2] has been proposed in this context as a global and harmonized architecture that enhances V2V routing mechanisms. The ITS reference architecture provides V2V failover mechanisms through vertical handover mechanisms provided by the embedded ITS protocol stack of vehicles' communication systems. Meanwhile, new architectures and mechanisms enabling D2D communications in cellular networks have become a hot discussion and an uprising research topic as they enable a new type of short range direct communications based on LTE. This new type of communication based on devices proximity information is envisioned to promote for a variety of new generation services going from the real-time location-based and context-aware services to public safety services. Recently standardized at the 3GPP level [3], are