Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học đề tài : Vehicular connectivity in urban scenarios: effectiveness and potential of roadside, moving WAVE providers and hybrid solutions | Campolo et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 146 EURASIP Journal on . http content 20ii i i46 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Vehicular connectivity in urban scenarios effectiveness and potential of roadside moving WAVE providers and hybrid solutions Claudia Campolo1 Hector Agustin Cozzetti2 Antonella Molinaro1 and Riccardo Scopigno2 Abstract Vehicular ad-hoc networks are expected to be a key enabling technology for the development of future Intelligent Transportation Systems ITSs by delivering a wide range of services spanning from safety alerting to route guidance and entertainment. Most of ITS applications require vehicles on the road to access the Internet through wireless communications with road-side units. The high vehicle mobility coupled with the large amount of investments required for deploying a complete roadside infrastructure will cause vehicle-to-roadside V2R connectivity to be poor short-lived and intermittent by negatively affecting the performance of envisioned applications. The purpose of this paper is to gain a deeper insight into possible issues related to service access and provisioning when considering the multi-channel operations envisioned by the IEEE WAVE Wireless Access in Vehicular Environments standards. We investigate network connectivity offered by roadside and moving WAVE providers in a realistic urban scenario where wireless propagation is hindered by obstructions. Results prove that hybrid solutions complementing roadside providers with moving ones lead to improved connectivity and data delivery performance by potentially incurring lower deployment costs. Introduction Several ongoing research efforts supported by car and electronic industries governments and academia are underway to foster the deployment of Vehicular Ad-Hoc NETworks VANETs . VANETs are expected to be a key enabling technology for the development
