QoS Aware Distributed Dynamic Channel Allocation for V2V Communication in TVWS spectrum Abstract   Vehicles use Dedicated Short Range Communication (DSRC) standard for communicating among themselves. But, with the increased number of onroad vehicles, DSRC channels get congested. So, an alternative to DSRC needs to be introduced, to meet the diverse demand for various vehicular applications. Federal Communication Commission released TV White Space (TVWS) for dynamic spectrum access. These TVWS channels has the potential to be used for VehicletoVehicle (V2V) communication. However, the vehicles are highly mobile and communicate in an adhoc manner. Thus, employing TVWS in V2V communication requires efficient optimized channel allocation technique. In this work, a distributed joint channel and power allocation technique is devised, that considers both spatiotemporal change of TVWS availability and vehicular mobility. The channels are allocated based on useru0027s transmission requirement with an adjusted power level such that significant interference is not caused to neighbouring primary users and other secondary users, transmitting in the same channel. Multiple vehicles are assigned a single channel using the proposed optimization technique to increase the system throughput. Vehicles are enabled with cognitive facility that allows them to sense the spectrum availability instead of relying on the geolocation TVWS database. The optimized channel and power allocation problem is a Mixed Integer NonLinear Programming model which is solved using Lagrangeu0027s dual method. Simulation analysis shows that proposed optimization technique achieves high throughput while maintaining the networku0027s QoS.

Joint UplinkDownlink Resource Allocation under Outage Case in Vehicular Communications Vehicular communications are widely developed through three types of network structures including vehicletoinfrastructure (V2I), infrastructuretovehicle (I2V) and vehicletovehicle (V2V). The information transmission requirements of V2I and I2V links needs high capacity and V2V links are vulnerable to the outage cases caused by high mobility of vehicles. Aim to this, we propose a Joint UplinkDownlink Resource Allocation under Outage Case (RAOC) scheme based on both traceable slowvarying large scale fading information and the fastvarying small scale fading information substituted into outage probability. Importantly, the stability of large V2V links can be guaranteed with the tolerable reduction of the sum capacity of all V2I links and I2V links, which is considered as the optimization objective. The simulation results indicate that the proposed algorithm improves the stability performance of V2V links at the little sacrifice of the sum capacity compared with another algorithm.