| 摘要 |
A radio communication system includes first and second portable terminals and a first switching network. Each portable terminal is assigned a unique identifier and has a display and timepiece. The first switching network has first and second base stations which are assigned unique identifiers and perform radio communication with the first and second portable terminals, a first switching unit connected to the first and second base stations, a first database which stores the positions of the first and second portable terminals in association with the positions of the first and second base stations, and a second database which stores pieces of time difference information of the first and second base stations. The first portable terminal has a time difference acquisition request unit and current time calculation unit. The first base station adds the identifier of the first base station to a time difference acquisition request, and transmits the time difference acquisition request to the first switching unit. The first switching unit has a first time difference acquisition unit, position information acquisition unit, second time difference acquisition unit, and time difference calculation unit. A destination portable terminal time identification method is also disclosed.
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