应急场景中网络垂直切换算法系统级仿真研究

In recent years, with the development of technology, the types of communication network standards and communication services in emergency scenarios are gradually increasing. How to maximize the use of communication systems of different standards to meet the performance requirements of each service has become an urgent problem to be solved, that is, it is necessary to study the network vertical handoff algorithm in the emergency scenario.At present, there are few simulation evaluations on the performance of traditional network vertical handoff algorithms in emergency scenarios. This paper evaluates the performance of several vertical handoff algorithms under different parameters by building a system-level simulation platform for emergency communication scenarios.The simulation results show that the vertical handoff algorithm based on RSS, SINR and AHP should select 1s as the timer cycle, which can ensure the performance of the algorithm and reduce the number of handoffs at the same time.Compared with RSS based vertical handoff algorithm, SINR based vertical handoff algorithm can improve the average user throughput by about 29.4% and the edge user throughput by about 270.8%.Compared with the vertical handoff algorithm based on RSS and SINR, the vertical handoff algorithm based on AHP can improve the user satisfaction rate by about 17.5% and 8.8% respectively.