Research On Non-cooperative Game Of Communication Quality And Privacy Of Mobile Ad Hoc Networks

In vehicular ad-hoc networks,a large number of vehicles in mix-zones can increase privacy but at the expense of losing communication quality.Thus,it is necessary to harmonize these two conflicting goals for privacy protection.In this study,we propose an internal optimization model and an external anonymity updating game to cross-layer joint the physical layers transmit power and MAC layers delay into a two-step non-cooperative game model,by which the communication and privacy players respectively enjoy one utility function.The first step is to establish an internal optimal model aiming to balance privacy and delay,where we can obtain the optimal transmit power.The optimal number of neighbor vehicles can be obtained by selecting the transmitting power,which can be used as the input of the second step.For the second step,we present a non-cooperative external anonymity updating game model to analyze the non-cooperative behavior of vehicles,all of which together strive to maximize the utility function at the minimum cost.We analyze the Nash equilibrium in n-player complete information game,we also derive the pure strategy Nash equilibrium.Extensive numerical calculations are conducted to comprehensively investigate the reaction of the Nash equilibrium to various combinations of parameters.The results show that the two-step non-cooperative game of anonymity updating is capable of selfadapting to the vehicular context and improving the privacy without compromising on communication quality.Users of mobile networks change their identifiers in areas called mixed zones to prevent third parties from tracking their location.Unlike previous work that considers global adversaries,we believe that local adversaries are equipped with multiple eavesdropping stations.We study the interaction between deploying a wiretapping station to track the vehicle node’s local adversary and deploying a mixed zone to protect their location privacy.We propose a game model to predict both strategies by using game theory.The vehicle first selects the transmit power,and the adversary knows the number of neighbor vehicles around the intersection and adjusts its monitoring strength.By calculating the optimal response function between the vehicle and the intercepting adversary,the paper derives the equilibrium strategy in the case of complete information,and reveals the influence of factors such as attack cost on the Nash equilibrium.The results show that vehicle node adjust transmit power adaptively through their adversary’s monitoring strategy to improve the privacy and security of communication.