Hitachi, Ltd.

Ayumu Koide

Nobukazu Doi

Mikio Kuwahara

Katsuhiko Tsunehara

Toshiro Suzuki

Yasuo Kogure

Takafumi Kojima

Yoshinori Kuroki

When a person of holding a mobile station gets near to a previously set target position, applicationis started and service of utilizing positional information is provided to the person of holding the mobile station or a third party. The mobile station includes a position comparatorfor comparing a current position of the mobile station calculated by a position calculatorby using a signal from an antennawith a target position inputted from means for target position inputand an application controllerfor controlling the applicationby using a result of position comparison. Further, a frequency of position calculation is pertinently controlled in the position calculatorby a position calculation controlleroperated by the result of position comparison

Mobile station using positional information

In a wireless terminal position measuring method for estimating the position of a terminal using signals sent from at least three base stations accommodated by a cellular communication system, position of the terminal is estimates according to the triangulation method by selecting three base stations arbitrarily, a plurality of estimated positions thus calculated are stored in a memory and averaged thereafter to obtain a final estimated position.

Wireless terminal positioning method and apparatus

In a radio paging system and a radio paging method, in which all transmitters are simply synchronized with each other with a satisfactory precision. A central exchange and each transmitter are each provided with a GPS clock for measuring time according to a current time transmitted from the GPS clock. An encoder of the central exchange adds to a message received from a network a real time, which is information to specify time to send the message from each transmitter, according to the current time measured by the GPS clock thereof and then distributes the message to the transmitters. A synchronizing section of each transmitter sends from a transmitting unit the message distributed from the central exchange to a receiver at a time specified by the real time added to the message according to the current time measured by the GPS clock thereof.

Radio paging transmitter which adjusts its transmission time based on

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Yokohama, Japan

Ayumu Koide