To prevent erroneous communication outside the specified communication area.
The method is provided with a calculating means for calculating the position of a mobile station by receiving an electric wave transmitted from a mobile station and detecting the incoming direction, a decision means for deciding whether or not the mobile station position exists within the specified area, and a means for controlling communication with the mobile station by using the decision result. Thus, by using a plural pieces of information on the mobile station position obtained through the radio communication, it is surely decided whether outside or inside the area the mobile station is located. When the mobile station position is decided to be inside the specified area, data to be transmitted next are transmitted to the mobile station. On the other hand, when the position is decided to be outside the specified area, re-send request processing of the data is made to the mobile station; and when the mobile station position is decided to be outside the specified area even after the decision is made for the defined number of times, the communication is decided to be abnormal one and it is canceled.
COPYRIGHT: (C)2005,JPO&NCIPI
Yoshihito Sato
Fukuoka Shohei
Katsumi Terado
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