Download or read book Improving Data Communications in Vehicular Ad Hoc Networks Via Cognitive Networks Techniques written by Ali Jawad Ghandour and published by . This book was released on 2010 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Researchers have suggested Vehicular Ad hoc Networks as a way to enable car to car communications and to allow for the exchange of safety and other types of information among cars. Several efforts have attempted to standardize the communication and networking schemes for vehicular settings. Of most importance is the Wireless Access in Vehicular Environments (WAVE) protocol stack standardized by the IEEE that allocates spectrum for vehicular communication. --In this report, we prove that WAVE does not necessarily provide sufficient spectrum for reliable exchange of safety information. We present a system that uses cognitive networking principles in vehicular networks to dynamically increase the spectrum allocated to the control channel (CCH) by the IEEE 802.11p amendment, where all safety information is transmitted. To do this, the proposed system relies on sensed data sent by the cars to road side units that in turn forward the aggregated data to a processing unit. The processing unit infers data contention locations and generates spectrum schedules to dispatch to the passing cars in an attempt to alleviate contention. Analysis and simulation results indicate the effectiveness of the system in easing contention and allowing a greater number of cars in a particular location to reliably communicate safety information.