| 摘要 |
Information is requested from a user terminal, especially from a mobile user terminal which cooperates with a communication system with substantially stationary transmitting stations, in order to retrieve information from a database by using a search engine in which information with location-related attributes is stored. The request is transmitted by the user terminal to a computer managing the database along with data characterizing the location of the user terminal. Said location data is produced or retrieved by the user terminal by way of data that is transmitted to the user terminal once the user terminal contacts at least one transmitting station of the communication system. The data used as location data or used to produce location data is either retrieved from memories or is detected by measurements and relates to geographical locations of transmitting stations, to the coverage area of transmitting stations, to signal transmit times, signal intensities, signal reflections, directional angles etc. The computer uses said location data for controlling the search engine in such a manner that it selects from the database only information having respective location-related attributes or organizes the data according to said attributes. The selected information and/or information organized according to location-related attributes is transmitted to the user terminal. The inventive method facilitates an information retrieval process that is automatically target-oriented and that is especially useful for tourism, transport and communications, the economy etc. |
