| 摘要 |
PROBLEM TO BE SOLVED: To accurately perform positioning by appropriately determining the validity/invalidity of assist information, such as ResPos, when a terminal travels, and reducing access frequency to a network. SOLUTION: When a GPS terminal 8 is located in a cell 1, positioning is performed by acquiring cell information and position information (ResPos) of the cell 1. Furthermore, since the ResPos acquired by the GPS terminal 8 in the cell 1 includes surrounding cell information about surrounding cells (cells 2 to 7), the surrounding cell information is also stored in the GPS terminal 8 in association with the ResPos acquired in the cell 1. When the GPS terminal 8 moves between a plurality of cells, positioning is performed using the ResPos stored in the cell 1 if the number of handovers is smaller than a predetermined threshold. On the other hand, if the number of handovers exceeds a predetermined threshold, positioning is performed using the ResPos acquired in the destination cell. COPYRIGHT: (C)2009,JPO&INPIT
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