Research On Interference Modeling In V2V Communication And Power Control

With the increment of vehicles, traffic congestion and safety arouse more and more attention. In order to relief traffic congestion and decrease traffic accidents, Vehicular Network is proposed.Power control is a main branch of Vehicular Network wireless communication research. There are two contradictions in power control. One is when transmit power increases, the interference increases at the same time, the other is the contradiction between a single node’s optimum and the overall optimum. In previous researches, few researchers study interference quantitatively. Meanwhile, in power control research most researchers suppose all the vehicles’ transmit powers are the same and adjust all these powers synchronously. In addition, in order to insure the safety of Vehicular Network, high quality wireless communication is needed for the position tracking accuracy.In this paper, vehicular wireless communication interference model is built firstly. According to if packets can be received successfully, interference is divided into interference within communication range and interference out of communication range. Transmit rate, transmit power and topology structure are considered. When it comes to improving position tracking accuracy by power control, a Vehicular Network power control problem is abstracted as a non-cooperative game. Each node take its transmit power as strategy and position tracking accuracy as pay off function. Then the existence and uniqueness of Nash equilibrium is prove under Vehicular Network environment and the Nash equilibrium solution is optimal transmit power. Finally, NS3 simulation is used.The method proposed performs better in average position tracking error, average packet transmission success probability and average transmission delay when traffic density is low.