English

应用科学学报 ›› 2010, Vol. 28 ›› Issue (6): 573-579.doi: 10.3969/j.issn.0255-8297.2010.06

• 通信工程 • 上一篇    下一篇

迟滞门限垂直切换判决算法的性能分析

谢胜东   

  1. 南京信息工程大学计算机与软件学院，南京210044
  • 收稿日期:2010-08-09 修回日期:2010-10-13 出版日期:2010-11-26 发布日期:2010-11-25
  • 作者简介:谢胜东，讲师，博士，研究方向：无线通信网络、复杂性理论，E-mail：xie-shd@163.com
  • 基金资助:

    南京信息工程大学校科研基金(No.S8110082001)资助

Performance of Vertical Handoff Decision Algorithm based on Hysteretic Levels

XIE Sheng-dong   

  1. Computer and Software Institute, Nanjing University of Information Science and Technology, Nanjing 210044，China
  • Received:2010-08-09 Revised:2010-10-13 Online:2010-11-26 Published:2010-11-25

PDF

1256

被引次数

5

摘要：

节点在某时刻的切换概率取决于该时刻之前所有时间内的状态，而考虑这些状态是十分困难的，因此传统分析方法只考虑前一时刻的状态，通常具有较大的误差. 本文针对无线局域网和蜂窝网组成的异构网络，提出了一种基于信号强度与距离的迟滞门限垂直切换算法；针对该算法的特点，提出了一种两步追踪的分析方法，解决了传统分析方法的不足. 最后从切换次数和阻塞概率两个方面，利用仿真对本方法的效果能进行了验证. 结果表明分析结果与仿真结果相当吻合.

关键词: 异构网络, 垂直切换, 信号强度, 性能分析, 切换次数

Abstract:

 The handoff probability of a node depends on all the states before current moment, and considering all the states is impossible. So traditional analysis method only take the states of the previous moment into consideration, which results in large errors. A vertical handoff algorithm based on hysteretic levels of received signal strength and distance is proposed in heterogeneous networks which are composed of cellular network and wireless local area network. A two-tracking method is also proposed for analyzing the algorithm performance, which resolves the deficiencies in tradition methods. We justify the analysis effects of the new method from the number of handoffs and the block probability. Simulation results show that they are coincided with the analysis results.

Key words: heterogeneous networks, vertical handoff, signal strength, performance analysis, number of handoffs

中图分类号: