Research On Data Forwarding Strategy Of NDN Vehicle Network

The car has been playing a very important role in people's lives,and because of the rapid development of the Internet of Things and the demand for car from a single driving function to a diversified service,the concept of car networking has been proposed,The core is how to more efficient access to data.IP network due to their own limitations,can be expected in the future is difficult to perfectly support the car network put forward a variety of technical requirements.The NDN network unique routing,can be very suitable for car network communications.The NDN network only cares about the correctness of the data obtained,rather than on how to obtain data and where to get the data.And the NDN network has the routing cache function,the data can be stored in the routing according to different replacement strategy,so the data may be stored in multiple routing nodes,greatly improving the efficiency of data acquisition,and the distribution of such data is also in line with the car network way of communication.In the car network,the vehicle in the process of running,you can directly from the neighbor vehicle to get the required data,without having to get from the source of the data,thereby reducing the number of routing forwarding,saving time and improve communication efficiency.But the NDN network still needs to solve many problems.On the one hand,flooding the broadcast strategy will lead to a lot of information loss and high retransmission overhead,which caused a great burden on the network.On the other hand,due to the ever-changing vehicle position,resulting in continuous changes in the topology,the vehicle may be in the case of broken network,thus reducing theefficiency of retransmission.This paper first proposes a distance-based forwarding strategy,and sets different forwarding latencies based on the distance of the node to the final destination location.The shorter the distance,the shorter the forwarding wait time.When a node waits for a broadcast,it receives the same interest package from the other node,indicating that the node has broadcast the interest package and therefore does not repeat the broadcast.This strategy is a good solution to the problem of flooding and interest package hit,but the average delay is higher.The concept of "popularity" is also presented in this paper,and "popularity" represents the degree to which the data carried by each node is popular.From the point of view of the data carried by the vehicle nodes,we design a forwarding strategy based on "popularity".In the judgment of whether or not the interest package is retransmitted,the "popularity" strategy not only ensures the efficiency of information transmission,To reduce the average delay time.In order to analyze the advantages and disadvantages of the forwarding strategy designed in this paper,the ndn SIM simulator under the NS-3 simulation platform is used to simulate the real road environment and physical environment,and simulate the running trajectory and communication of the vehicle.The experimental results show that,under the V2 V communication of NDN network,the forwarding strategy designed in this paper is better suitable for communication between vehicles than the original forwarding strategy.