| 摘要 |
A communications system is provided for emergency services personnel that includes a plurality of portable devices (20) and a base station (12) . The portable devices are configured to be carried by emergency services personnel while at an emergency site. The portable devices each have a first transceiver (50) configured to communicate over a first network and a second transceiver (60) configured to communicate over a second network, where the first and second networks operate independent of one another. The base station (12) has at least one transceiver for communicating with the portable devices over at least one of the first and second networks. Furthermore, an emergency search procedure using that communication system is provided. Search messages are sent over the second network (610) and relayed to the target device (608) . A reply message is sent from the target device over the second network (612) .
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