Design And Implementation Of Resource Allocation For Aircraft And Earth Communication System Based On Content Center Network

At present,there are mainly three types of airport-based wireless data transmission methods for machine-to-machine communications:customized wireless transmission technology,cellular wireless transmission technology,and WLAN wireless transmission technology.On the one hand,due to the specialties of customized wireless transmission,high cost and narrow application range,the cost of base stations in cellular networks is large and the location of base stations is limited.The coverage of communication signals in airports can not meet the real-time communication requirements of aircraft and airport data centers.On the other hand,since the data transmission between the aircraft and the airport is large in data volume and high in frequency of updating,the application of the data transmitted by the WLAN network transmitter increases the risk of network traffic and network congestion.Considering that the data required by aircraft belonging to the same airline are similar,this paper uses a content-centric network with cache features to achieve high reusability of data,reduce network traffic and slow communication delay based on WLAN network Network congestion,improve system communication performance.Therefore,considering the above problems,this dissertation makes the design and implementation of content-centric network based on machine-to-machine communication:In the design of content-centric communication network based on machine-to-machine communication,this paper mainly makes the following three innovations:1)The geo-environment of machine-to-machine communication has strong regional characteristics,large amount of communication data and high repeatability,and has designed a tree network Topology,and on this basis proposed a fair resource allocation model.Add weights to the caching nodes to balance the caching benefits of nodes at different levels so as to achieve fairness of the model.2)To solve the resource allocation model,a greedy algorithm with threshold based on user’s request is proposed.Taking the number of user requests as the judgment criterion for content popularity,a top-down greedy algorithm is implemented in a network structure with obvious hierarchy.Put forward the concept of threshold,in order to improve the fairness of the system.3)Put forward the evaluation criteria of system fairness,that is,hit rate variance.By measuring the variance of hit rate,we evaluate the cache difference of each node,and then evaluate the fairness of the whole system.The algorithm of this problem is simulated by ndnSIM system.The results show that the proposed algorithm can effectively improve the hit rate,reduce the network delay and improve the fairness of the system.In the process of setting up the demonstration system of machine-to-machine communication,this paper runs the CCNx protocol in the Ubuntu system and implements the greedy algorithm with threshold based on the user’s request in this protocol to establish the tree communication network structure.By changing the size of the request data And the similarity of the requested data,the node hit rate,network delay and hit ratio variance of the system are obtained in the actual communication environment,finally the system communication performance in the actual communication environment is obtained.