| 摘要 |
A method and a system for monitoring a communications possibility between a monitoring unit in a cellular radio network, such as a GSM-network, and a number of mobile units in the network, said mobile units being coupled to respective monitoring objects from which it shall be possible to send information to the monitoring unit via the network, wherein there is established in the monitoring unit a first list of those mobile units to be monitored, wherein the monitored mobile units choose an identity that corresponds to the identity of the net cell serving respective mobile units, wherein a monitored mobile unit that detects the net cells to which it is related chooses a new serving cell and therewith a new serving cell identity in the event of its preceding serving cell no longer being in function, and wherein the network maintains a second list which is continually updated with respect to status for the whole of the network. The first list is updated continually by virtue of each mobile unit that obtains a new serving cell identity automatically informing at least the monitoring unit in this respect, and therewith keep the first list updated. The first list is compared with the second list. A mobile unit that is included in the first list and its ability to communicate with the monitoring unit is identified by virtue of its serving cell identity referring to a net cell which, according to the second list, is out of function. The monitoring object can then be given other supervision.
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