Study Of Device-to-Device Communication In Internet Of Vehicles

In recent years,China had accelerated the process of urbanization,which had led to a growing number of cars.However,infrastructure construction had not kept pace with the growth in the number of cars.In this case,the road congestion,frequent traffic accidents,and other issues followed.In order to optimize the urban road traffic conditions,intelligent transportation system came into being.The application of things in the field of intelligent transportation has a very broad prospects,and this application is reflected in the internet of vehicles.However,there are many problems such as delay,low speed and other issues in the communication of the internet of vehicles,which can not play a good effect for the coordination of the road situation.D2 D communication technology has the advantages of low delay and low energy consumption.Therefore,this paper combined with D2 D technology and network coding technology,on the car network cluster and collaborative transmission were studied.The main research content can be summarized as follows:(1)Clustering Algorithm Based on Combination of Vehicle Spacing and Vehicle Motion Consistency.The traditional clustering algorithm based on motion consistency does not take into account the fact that traffic flow is sometimes too large,which leads to too many vehicles in the same cluster,leads to excessive cluster head network pressure and reduce communication quality.In this algorithm,the vehicle spacing is considered as one of the factors of the clustering algorithm,so as to effectively improve the D2 D communication quality when the traffic flow is large.Through the simulation experiment shows that the algorithm this paper proposed,the communication time of vehicles is increased,especially when vehicles is increased.(2)Cooperative relay transmission algorithm based on D2 D vehicle network and network coding technology.On the basis of the existing D2 D based vehicle network cooperative transmission algorithm,the network coding technology is used to make the cooperative nodes in cluster to transmit information to each other.The cooperative node carries out a network coding operation with the information sent by the other cooperative nodes and then sends the encoded signal to the cluster head in the next time slot.The cluster head decodes it and performs the operation with the backup information received in the previous time slot,and finally the cluster head obtains the information transmitted by the cooperative node.Through the simulation experiment shows that the proposed algorithm is much more efficient than the traditional cooperative transmission algorithm in terms of system reachability and bit error rate.(3)A D2 D Relay Transfer Algorithm Based on Complex Domain Network Coding.In order to solve the problem of the communication between the edge node and the cluster head,the algorithm uses the complex network coding technology to carry on the relay transmission.N edge nodes look for a suitable node within the cluster as a relay.The edge node encodes the selected complex field coding coefficient and its own signal and sends it to the relay node.The relay node sends the encoded signal to the cluster head in the next time slot.According to the complexity of the network coding coefficients,the cluster heads decode the signals to complete the information collection of the edge nodes.Through the simulation experiment shows that the proposed algorithm improve the network throughput and further improve the stability of the cluster.