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Computer Engineering ›› 2010, Vol. 36 ›› Issue (19): 117-119. doi: 10.3969/j.issn.1000-3428.2010.19.040

• Networks and Communications • Previous Articles     Next Articles

Terminal Moving State-based Link-Going-Down Trigger Algorithm

ZHANG Ru-yun, WANG Yu-hong, HUANG Kai-zhi, JI Xin-sheng   

  1. (National Digital Switching System Engineering Technological Research Center, Zhengzhou 450002, China)
  • Online:2010-10-05 Published:2010-09-27

基于终端移动状态的LGD触发算法

张汝云,王玉红,黄开枝,季新生   

  1. (国家数字交换系统工程技术研究中心,郑州 450002)
  • 作者简介:张汝云(1973-),男,讲师,主研方向:移动通信;王玉红,硕士;黄开枝,副教授;季新生,教授
  • 基金资助:

    国家“863”计划基金资助项目(2007AA01Z434, 2008AA 011001)

Abstract:

Timely firing of Link-Going-Down(LGD) trigger is critical to handover performance and is significant in determining whether the handover completes successfully. This paper proposes the terminal moving state-based LGD trigger algorithm. It calculates the received signal power from the terminal moving model, and puts it as part of the predictive process. Simulation results show that the proposed algorithm can significantly decrease packet lost and the time between handover finishing and link down.

Key words: Link-Going-Down(LGD) trigger, handover cost, terminal moving model, Least Mean Square(LMS) predictive scheme Link-Going-Down(LGD) trigger, handover cost, terminal moving model, Least Mean Square(LMS) predictive scheme

摘要:

针对垂直切换中LMS预测LGD触发机制没有考虑终端移动状态的问题,提出基于终端移动状态的LGD触发算法,由终端移动模型推导出移动状态(速度和方向)与信号强度的关系,并将信号强度推导值与抽样值加权求和后采用LMS算法预测信号强度的变化趋势。仿真表明,改进后的LMS算法预测误差小,可以降低丢包率和空闲时间。

关键词: LGD触发, 切换代价, 终端移动模型, LMS预测机制

CLC Number: