Foreword Raúl

have edited this new book to reflect the present and future challenges in wireless technologies for vehicular ad hoc networks. New technologies are being developed for vehicular ad hoc networks, and these networks provide an efficient method for today's complex vehicle communications. Emerging vehicular ad hoc networks in the forms of Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) communications are a cornerstone of the envisioned Intelligent Transportation Systems (ITS). By enabling vehicles to communicate with other vehicles via V2V communication as well as with roadside infrastructure via V2I communication, vehicular ad hoc networks will enable a variety of applications for safety, traffic efficiency, driver assistance, and infotainment. For the safety requirements, vehicular network technologies will be applied to reduce accidents so as to save lives and reduce injuries. Examples of such applications include vehicle breakdown and obstacle detection, lane departure warnings, accident warnings, collision warnings, over-height/over-width warnings, turnover warnings, work zone warnings, black box recorder to register accident forensics, and so on. For traffic efficiency, vehicular network technologies will be applied to improve the flow of traffic and reduce congestion, for example, cooperative adaptive cruise control, highway/rail intersection traffic management, congestion information for traffic control, electronic toll collection, et cetera. For driver assistance, vehicular networks can also provide accurate information and data, as well as good communications for drivers to improve safety and security, e.g., advanced navigation systems, parking information, real-time traffic information , various kinds of warning information, driver's daily blog, automatic emergency calls, and so on. This book has provided wireless technologies from the physical layer to the application layer and new research challenges for vehicular ad hoc networks to realize the above exciting applications. First, this book describes the physical layer characteristics for the wireless channel, and identifies the distinguishing features of V2V channels. Due to the low antenna elevations, and mobility of both transmitters and receivers in the V2V environment, the V2V wireless channel can be one of the most challenging elements to ensuring reliable V2V communication. Hence, channel modeling and modulation and coding techniques for V2V communications are presented in this book. It then introduces a detailed description of the major features and operating principles provided by Physical (PHY) and Medium Access Control (MAC) layers of the IEEE 802.11p and IEEE 1609 standard suites to support Wireless Access in Vehicular Environments (WAVE). It further presents the alternative MAC solutions based on a synchronous, slotted philosophy. It also …