异构网络中基于会话分流的接纳控制算法研究  

Research on Session Splitting-based Joint Call Admission Control Algorithm in Heterogeneous Wireless Networks

作　　者：刘胜美[1] 牛雪玲[1] 

机构地区：[1]南京邮电大学,江苏南京210003

出　　处：《计算机技术与发展》2015年第8期48-52,共5页Computer Technology and Development

基　　金：国家自然科学基金资助项目(61271235)

摘　　要：文中在WLAN和3G互连的异构网络中提出一种基于会话分流的呼叫接纳控制算法。当网络中任意一个无线接入技术(Radio Access Technology,RAT)都不能为呼叫提供接入时,通过会话分流技术将呼叫在多个无线接入网中传输,接纳这个新的呼叫,并在接收端组合这些分流还原会话。首先构建3G和WLAN相互融合的网络拓扑结构,然后根据多维马尔可夫链模型模拟联合呼叫接纳控制过程,分析异构网络中呼叫接纳控制算法性能的两个重要指标:新呼叫阻塞率和切换呼叫中断率。仿真结果表明,所提算法能够在网络接近满载时有效降低网络中的新呼叫阻塞率和切换呼叫中断率,提高网络的整体利用率。A novel session splitting-based joint call admission control algorithm in a heterogeneous wireless network combined WLAN and 3G is proposed. The packet stream is split and admitted into multiple radio access networks when none of the available individual radio access technologies have enough bandwidth to support the incoming call, at the receiver, the split packet stream are combined. A heterogeneous wireless network combined 3G and WLAN is built firstly, then multidimensional Markov chain model is used to simulate the process of joint call admission control and analyze the new call blocking probability and handoff call dropping probability of the proposed algorithm. Simulation result shows that the proposed algorithm can reduce call blocking/dropping probability and improve the utility of networks when networks are almost at full capacity.

关 键 词：异构无线网络 联合呼叫接纳控制 会话分流 马尔可夫链模型 新呼叫阻塞率 切换呼叫中断率 

分 类 号：TN929.5[电子电信—通信与信息系统]