Research On Forwarding Strategy Of Forest Fire VANET Based On Named Data Network

With the rapid development of the Internet of Things,the self-organizing network in vehicles is attracting a lot of attention.With the advent of the age of big data,data itself has become the focus of users and permeates all aspects of our lives.In the forest fire fighting task,the situation of the fire scene is volatile and the situation is complex and changeable.It is necessary to flexibly use various communication means,scientific networking,and multi-level and multi-network three-dimensions protection to form an all-round security system that connects vertically and horizontally.According to the current research situation,the traditional host-oriented IP network will no longer meet the needs of current challenges.This article introduces a content-centric future network architecture called named data network(NDN).It is fundamentally different the IP network.It can deal with many existing problems in traditional network.It can also use new data packets and routing methods to replace the routing strategy in the original network.The architecture of the NDN is particularly suitable for the on-board ad hoc network,changing the IP address to the named data,and in the distribution process based on the content rather than the location of the host during the distribution period.At the same time,all routing routers in the NDN architecture have the function of caching,and multiple data distribution can be used to copy the same data to improve the efficiency of data acquisition.However,there are still many challenges in using the NDN architecture to the vehicle ad hoc network.In particular,the vehicle ad hoc network has the characteristics of intermittent connection.At present,the focus of related research is effective content discovery,that is,the forwarding strategy of interest packets.Aiming at the specific scene of forest firefighting mission,this article finds the general laws from the topographic map of the fire site and makes a typical fire site spreading diagram.It proposes a forwarding strategy based on the vector direction for the specific forest firefighting scenario.The traditional NDN data structure is modified and the new fields are created.According to the vector direction of firewire,the vehicle receiving the packet of interest and requesting the data information optimize the checking of forwarding vehicles in judging whether it is the same side.At the same time,according to extensive investigations and studies,the maximum number of forwarding hops is set as the number of the rescue organizations in the mission to control the occurrence of unlimited forwarding.This strategy solves the problem of high end-to-end average delay in flooding broadcasting in certain scenarios.The article also proposes the concept of measuring the “urgency” of data information requests based on the frequency of real-time data requests and the real-time performance of data,that can be used as the basis for forwarding interest packets and caching data packets.Taking into account the data carried by the nodes of the vehicles,according to the emergency characteristics of forest fire protection,a forwarding strategy based on “urgency” is developed.This strategy can not only ensure the effectiveness of information transmission,but also successfully increase the hit rate of information received.To evaluate the effectiveness of this strategy,this article uses SUMO to simulate network traffic,and the ndn SIM network simulator on the NS-3 simulation platform for simulation experiments.The experimental results show that compared to using the existing NDN architecture for V2 V communication,the modified forwarding strategy is more advantageous for vehicle-to-vehicle communication in forest firefighting tasks.The modified forwarding strategy can effectively improve the content discovery performance and reduce redundant copies,thereby reducing the end-to-end average delay time,increasing the data information hit rate,and improving the quality of communication.