Communication system and apparatus
First Claim
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1. A communication system comprising:
- a first communication device comprising;
first transceiver means for transmitting and receiving signals on a first communication medium selected from the group consisting of infrared waves, electromagnetic waves, ultrasonic waves, and radiation waves, when the first communication device is in an on-site area, the on-site area including a plurality of areas;
second transceiver means for transmitting and receiving signals on a radio frequency communication medium, when the first communication device is in an off-site area; and
determining means for determining when the first communication device is in the on-site area and when the first communication device is in the off-site area, the determining means being coupled to the first and second transceiver means; and
network controller means comprising;
means for determining if the first communication device is located in the on-site area; and
alerting means responsive to the determining means of the network controller for providing an alert if the first communication device has not reached a select one of the plurality of areas in the on-site area.
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Abstract
A communication device (16) comprises first and second transceivers and apparatus for determining when the communication device (16) is in an on-site area (11) and when the communication device (16) is in an off-site area. The first transceiver transmits and receives signals on a first communication medium (17), when the communication device (16) is in a first area (11); whereas, second transceiver transmits and receives signals on a second communication medium (28), when the communication device (16) is in a second area.
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Citations
5 Claims
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1. A communication system comprising:
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a first communication device comprising; first transceiver means for transmitting and receiving signals on a first communication medium selected from the group consisting of infrared waves, electromagnetic waves, ultrasonic waves, and radiation waves, when the first communication device is in an on-site area, the on-site area including a plurality of areas; second transceiver means for transmitting and receiving signals on a radio frequency communication medium, when the first communication device is in an off-site area; and determining means for determining when the first communication device is in the on-site area and when the first communication device is in the off-site area, the determining means being coupled to the first and second transceiver means; and network controller means comprising; means for determining if the first communication device is located in the on-site area; and alerting means responsive to the determining means of the network controller for providing an alert if the first communication device has not reached a select one of the plurality of areas in the on-site area. - View Dependent Claims (2, 3, 4, 5)
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Specification