一种新的基于UMTS和WLAN的自适应垂直切换算法  

A Novel Adaptive Vertical Handoff Algorithm Based on UMTS and WLAN

作　　者：金玲[1] 张晖[1] 杨龙祥[1] 朱洪波[1] 

机构地区：[1]南京邮电大学江苏省无线通信重点实验室,江苏南京210003

出　　处：《南京邮电大学学报（自然科学版）》2013年第4期13-18,38,共7页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家科技重大专项(2011ZX03005-004-03,2012ZX03001008-003);国家自然科学基金(61101105);教育部博士点基金(20113223120001);江苏省高校自然科学研究(10KJB510013);江苏省博士后科研基金(1102012C);江苏973计划(BK2011027)资助项目

摘　　要：针对异构网络的特性和用户无缝连接的需求,研究了UMTS和WLAN融合架构下移动终端移入WLAN时的切换必要性和移出WLAN时切换时刻的合理性。在此基础上,综合考虑终端和网络的上下文环境,利用概率理论提出了一种新的基于补偿时间的自适应垂直切换算法。仿真结果表明:与两种切换算法相比,该算法能更加准确合理地进行切换判决,有效降低乒乓效应和切换中断概率,提升了切换效能。According to the characteristics of heterogeneous networks and user demand for seamlessly con- nection,the necessity of switching to WLAN was researched. Considering the context of mobile terminals and networks, we propose an adaptive vertical handoff algorithm based on compensation time. The simula- tion results show that compared with two handoff algorithms, the proposed algorithm can make handoff de- cisions more effectively and accurately. The algorithm reduces the ping-pong effect and interruption proba- bility and improves the handoff performance.

关 键 词：UMTS WLAN 垂直切换 补偿时间 

分 类 号：TN929.5[电子电信—通信与信息系统]