模糊控制系统的垂直切换判决算法分析

Research on an algorithm of fuzzy control based vertical handoff

针对模糊控制系统中切换时延较长和切换次数较多的问题,研究了一种基于模糊控制系统的垂直切换判决算法。在基于信号强度判决时将RSS作为门限值,提高系统判决能力;同时,将网络参数和服务类型作为判决因素,结合层次分析法引入并行的模糊控制系统,缩短了切换判决的时间、选择适合用户的最佳网络,做出垂直切换。仿真结果表明,该算法减少了切换次数,降低了切换时延,增强了系统的性能。与传统的切换算法相比较,该算法对切换的判决因素考虑的更全面,兼顾了用户终端的使用环境及成本问题,有效地保证了网络的服务质量。

Aiming at the problem that there are many switching delay and switching times in fuzzy control system,a fuzzy control based vertical handoff algorithm is proposed to solve the problem of handoff.The received signal strength is adopted to set up the threshold,and the ability of decision is improved.The network parameters and service type are set as decision factors,and analytic hierarchy process is combined with the parallel fuzzy control system to shorten decision time and select the best suitable network for users.The simulation result shows that the algorithm can reduce the time and frequency of handoff and enhance the performance of the system.Compared with the traditional handover algorithm,the algorithm considers comprehensive decision factors,and it not only takes the use of the environment and the cost of the user terminal into account,but effectively ensures the quality of service of the network.