| 摘要 |
System and method for identifying various types of room facilities to find out and take into account space information. A tag of a space (S 2 ) is included in the fluctuation of the intensity of the light emitted by a lamp (LF 1 ) provided in the space in question. The receivers included in the system are arranged e.g. in commercial mobile stations (R 1 ). These are provided with a light detector and with a DSP algorithm that analyses the signal given by said light detector. As a result of the analysis, for instance the mobile station is automatically switched off when entering the space in question. There is neither needed a separate transmitter nor separate energy supply arrangements to send the space tag, and the space tag signal can be detected throughout said space. As regards the mobile station, the space-specific operations can be performed automatically, so that the mobile station user does not need to bother, and his possible negligence does not prevent the precautions from being executed.
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