| 摘要 |
The subject of the invention is a means to locate a mobile telephone, applied in particular to the provision of services rendered to the owner of the mobile telephone, such as information on shops and services in the immediate area. The essence of the method based on the invention relies on the fact that a telephone in the invention is introduced to an area in range of a low-power mini BTS (base transceiver station). This fact is detected as the value of signal strength received from the low-power mini BTS compared as regards the order of magnitude with the strength of signal received from a high-power urban BTS. This is detected on the basis of changes in the list of the strongest signals received by the mobile telephone. A programme operating in the SIM card of the mobile telephone is informed of such change in the list. With the aid of the programme, the identifier of each new base station on the list is checked. If the identifier comes from the range assigned to base stations used for localisation, information on this event is transmitted to the exchange. On this basis, with the aid of a database, the location of the mobile telephone is determined as the location of the low-power mini BTS. |
