The invention disclosed two groups (, ), each vector with Go to the case where the two groups over time the partition time () and to predict, for each group area (, ) in consideration of each group vector and partition using vector of the point () and the area considered obtaining, each group the actual direction of movement of the and and consider obtaining each direction using a vector of the partition point, the center distance traveled in each group () the relative speed of each group (, where and is and divided by the speed) and a speed considering obtaining a partition of time. According to the ; The structure, all sides of the partition in which the groups, different speed, by predicting the exact time in consideration of the other partition area that is a duplicate message, it is possible to reduce the overhead, it is possible to eliminate the message is lost.
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