LDCQ下的误差限制问题

Error limitation in LDCQ

提出了位置相关连续查询 (LDCQ)中的误差限制的概念 ,误差可以是位置误差或者是时间误差 .因为移动对象和查询边界实际相交的位置和时刻事先难以确定 ,所以一般采用预测相交点作为参照点 .对选取合适的系统参数使之满足给定的误差限制进行了讨论 ,研究结果表明 ,可以选择预测相交时刻移动对象的位置和查询边界上预测相交点的实际位置到预测相交点的距离 ,或者选择它们之间的距离 ,使之满足给定的误差限制 .

This paper discussed how to select proper system parameters to meet the requirements of the error limitation. At the predicted intersecting time, the distance from the location of a moving object and the actual location of the predicated intersecting point on the query boundary to the predicted intersecting location, or the distance between them was chosen to meet the given error limitation. By means of error limitation, the relationship between the deviation limit of query boundary and that of moving object can be determined.