摘要
垂直切换是多网融合的基础,也是未来移动互联网的关键特征和核心技术。分析了现有的切换触发机制,从节点运动模型出发,提出了一组适合异构无线网络环境的垂直切换仿真评价模型,用来评价运动方向和运动速度对切换性能的影响,以及规律运动、随机运动过程中垂直切换算法的实时性和有效性。并且,定义了“命中率”和“平均乒乓次数”两个评价指标来衡量垂直切换算法的性能。基于所提出的仿真评价模型及评价指标,对常用的切换算法进行了性能分析,仿真结果可以很好地反映算法性能。
Vertical handoff is the basic requirement of the convergence of different access technologies. It is also the key characteristic and technology of Wireless Mobile Internet. The existing handoff triggering algorithms were analyzed and a set of novel performance evaluation models for vertical handoff in heterogeneous wireless networks were provided based on mobile node＇s different motion models. Two metrics, matching ratio and average ping-pong number, were defined to evaluate the performance of vertical handoff algorithms. Based on the proposed models and metrics, the performance of two vertical handoff algorithms was compared： hysteresis based algorithm and dwelling-timer based algorithm. The results show a very good match between simulation and analytical results.
出处
《系统仿真学报》
EI
CAS
CSCD
北大核心
2007年第2期277-281,共5页
Journal of System Simulation
基金
国家自然科学基金(90604016)
中国科学院计算技术研究所创新课题(20056320)。
关键词
异构无线网
垂直切换
水平切换
性能评价
heterogeneous wireless networks
vertical handoff
horizontal handoff
performance evaluation
