| 摘要 |
In a mobile communication system having a base station and a mobile station, indoor and outdoor antennas are provided in different locations of a building structure that substantially prevents penetration of electromagnetic radiation. A communication unit is connected between the indoor and outdoor antennas. The communication unit is arranged to detect a signal received at the first antenna from the mobile station while the mobile station is communicating with the base station, determines that the mobile station is entering the structure when the detected signal exceeds a predetermined reference level and establishes a radio link between the outdoor antenna and the base station and a circuit between the first and second antennas and commands the mobile station to establish a radio link to the indoor antenna. The radio link established between the mobile station and the indoor antenna uses forward and reverse channels that avoid interference with other mobile stations.
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