| 摘要 |
In traffic control or surveillance systems it is mandatory that the single mobile units communicate their positions to a central control station. According to the invention this is effected particularly advantageously using a mobile telephone network system such as the GSM-network. For one thing, such a network is well suited to handle many concurrent calls, e.g. from busses in city traffic, and for another thing such a network is also well suited for automatically localising the positioning of the mobile units throughout a widespread, cellular GSM or similar communication system.
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