Research On D2D Transmission Control Technology For Disaster Scenes

In a disaster scenario,traditional cellular network base stations are destroyed and cannot continue to complete the transmission function.How to quickly transmit information in disaster scenarios and mitigate network performance degradation caused by disasters is an extremely important issue for rescuing the affected users.D2 D technology,as an emerging technology to improve network performance,has the characteristics of device-to-device direct communication and can solve network problems in disaster scenarios.Therefore,introducing D2 D communication technology in disaster scenarios is of great significance for maintaining network performance.This paper focuses on the application of D2 D technology in disaster scenarios,and research the characteristics of disaster scenarios,the probability of connection between D2 D users and users of cellular networks in disaster scenarios,and the resource allocation and transmission rate problems that exist in the network units that survived the disaster.According to the characteristics of the actual disaster scene,the probability regional failure model is used to simulate the disaster scene.Compared with the traditional disaster model,the model is closer to the actual disaster scene.Based on the connection between users in a disaster scenario,the communication and interference between users after D2 D communication technology was introduced in disaster scenarios were analyzed,and the specific conditions to be met when the D2 D connection was successful were obtained.In the disaster scenario studied,there are three specific types of communication situations.In order to analyze network performance,the probability of network connection under each type of communication is calculated.The results of numerical calculations show that after the introduction of D2 D communication technology,the network disaster buffering performance of disaster scenes has been improved by 50%-70%,and the simulation results are compared with the numerical calculation results to verify the effectiveness of this method.In view of the problem of resource allocation and transmission rate for surviving network elements that survived the disaster,the problem of the allocation of three spectrum resources and the situation of sharing wireless network resources between D2 D users and cellular network users existing in the surviving network unit are studied.Combining power and energy constraints,three spectral resource allocation methods and transmission rate functions under two constraints are derived.The obtained transfer rate function is solved,and the sum rate of cellular network communication and D2 D communication under the traditional greedy algorithm and non-greedy algorithm is analyzed.By simulating the problem of resource allocation and transmission rate existing in the surviving network elements,the change rate of the sum rate under different algorithms can be obtained.The research results in this paper show that the introduction of D2 D communication technology in disaster scenarios can maintain the network performance.By studying the surviving network elements in disaster scenarios and comparing the changes of the sum rate function under different algorithms,the appropriate sum rate function can be obtained.