| 摘要 |
A cellular radio network based positioning system for determining the position of a mobile station ( 16 ). For each base transceiver station ( 1 to 5 ) or cell of the network, a fixed list of base transceiver stations is stored by a Mobile Positioning Centre ( 13 ). Each list identifies those base transceiver stations which enable the position of a mobile station served by the corresponding base transceiver station ( 6 ) to be optimally determined. The list is transmitted to the mobile station ( 16 ) via the serving base transceiver station ( 6 ) and the mobile station determines an observed time difference for each of the listed base transceiver stations, relative to the serving base transceiver station ( 6 ), from signals broadcast by the listed base transceiver stations. The observed time differences are transmitted from the mobile station ( 6 ) to the serving base transceiver station ( 6 ) and are used by the network to compute the position of the mobile station ( 16 ).
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