PCS网络中基于方向的自适应位置管理模型

Location Management Model Based on Movement Directions for PCS Network

研究了个人通信服务网络中的位置管理问题 ,提出了基于方向的自适应位置管理方法 (ADBU) ,该方法有效地减小了整个系统的位置管理总开销 .移动终端周期地检测其运动方向 ,当它的改变超过预先设定的阈值时 ,系统将更新它在数据库中的位置信息 .采用了高斯 -马尔科夫模型来模拟移动终端的运动方向 ,然后通过自适应反馈控制方法来调整移动终端的最佳方向阈值 ,从而减小其位置管理开销 .仿真结果表明ADBU的位置管理开销要明显小于基于距离的位置管理方法 ,也小于直线式寻呼位置管理方法 .

In this paper,the location management problem in PCS network is studied.An adaptive direction based location update (ADBU) scheme is proposed in which an adaptive direction based scheme is formulated for location update generation.Mobile terminals inspect their directions and a location update will be generated when the change in the direction is greater than the direction threshold.In the paper,a Gauss Markov process is used to model the movement of a mobile terminal.With a feedback control mechanism,the optimal value for the direction threshold with the attempt to minimize the cost is estimated.Results have shown that the location management cost performance of ADBU is significantly better than the line paging scheme and the distance? based scheme.