Communiation Terminal Apparatus, Base Station Apparatus And Communication System

Abstract: Provided is a radio communication technology with high reliability. A communication system includes a communication terminal, base stations performing radio communication with the communication terminal, and a host device of the base stations. A serving base station of the communication terminal or the host device selects, from among the base stations, a positioning base station transmitting a positioning signal for measuring a position of the communication terminal. The positioning base station transmits the positioning signal, and the communication terminal receives the positioning signal. The communication terminal, the serving base station, or the host device estimates the position of the communication terminal, based on a reception result of the positioning signal from the communication terminal, and a specific-precision positioning base station that can communicate with the communication terminal via direct waves is selected as the positioning base station when positioning precision required for positioning of the communication terminal is higher than or equal to specific precision (ST1450, ST1452, ST1453).

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