Secure cargo transportation system
First Claim
1. A wireless communications device, comprising:
- a processing unit;
a location-determining subsystem communicatively coupled to the processing unit, the location-determining subsystem to determine a current location of the wireless communications device using a global positioning system (GPS);
a first wireless communications subsystem coupled to the processing unit, the first wireless communications subsystem to communicate location information using a cellular communications system; and
a second wireless communications subsystem coupled to the processing unit, the second wireless communications subsystem to modulate a radio frequency (RF) field provided by a remote interrogator to wirelessly provide a random number generated on the wireless communications device as an identifier of the wireless communications device;
wherein the second wireless communications subsystem is switchable between transmitting in a passive mode and transmitting in an active mode.
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Accused Products
Abstract
One embodiment provides a wireless communications device comprising a processing unit; a location-determining subsystem communicatively coupled to the processing unit, the location-determining subsystem to determine a current location of the wireless communications device using a global positioning system (GPS); a first wireless communications subsystem coupled to the processing unit, the first wireless communications subsystem to communicate location information using a cellular communications system; and a second wireless communications subsystem coupled to the processing unit, the second wireless communications subsystem to modulate a radio frequency (RE) field provided by a remote interrogator to wirelessly provide a random number generated on the wireless communications device as an identifier of the wireless communications device; wherein the second wireless communications subsystem is switchable between transmitting in a passive mode and transmitting in an active mode.
128 Citations
17 Claims
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1. A wireless communications device, comprising:
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a processing unit; a location-determining subsystem communicatively coupled to the processing unit, the location-determining subsystem to determine a current location of the wireless communications device using a global positioning system (GPS); a first wireless communications subsystem coupled to the processing unit, the first wireless communications subsystem to communicate location information using a cellular communications system; and a second wireless communications subsystem coupled to the processing unit, the second wireless communications subsystem to modulate a radio frequency (RF) field provided by a remote interrogator to wirelessly provide a random number generated on the wireless communications device as an identifier of the wireless communications device; wherein the second wireless communications subsystem is switchable between transmitting in a passive mode and transmitting in an active mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A portable device, comprising:
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a processing unit; a location-determining system coupled to the processing unit, the location-determining system to determine a current location of the portable device using a global positioning system (GPS); a memory to log locations determined by the location-determination system with respect to time; a first antenna; a cellular communications device coupled to the processing unit and the first antenna, the cellular communications device to communicate location information via the first antenna using a cellular communications system; a second antenna; and an identification device coupled to the processing unit and the second antenna, the identification device to generate a random number as an identifier of the portable device and to provide the random number, via the second antenna in a passive mode of operation, by modulating a radio frequency (RF) field provided by an interrogator wirelessly coupled to the identification device; wherein in an active mode of operation the identification device is to provide an RF field for communications. - View Dependent Claims (12, 13)
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14. A wireless communications device, comprising:
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a processing unit; a location-determining subsystem communicatively coupled to the processing unit, the location-determining subsystem to determine a current location of the wireless communications device using a global positioning system (GPS); a first wireless communications subsystem coupled to the processing unit, the first wireless communications subsystem to communicate identification information using a cellular communications system; and a second wireless communications subsystem coupled to the processing unit, the second wireless communications subsystem to modulate a radio frequency (RF) field provided by a remote interrogator to wirelessly provide a random number generated on the wireless communications device as an identifier of the wireless communications device; wherein the second wireless communications subsystem comprises a transmitter switchable between a first mode in which the transmitter modulates the RF field generated by the remote interrogator and a second mode in which the transmitter modulates an RF field generated by the identification device. - View Dependent Claims (15, 16, 17)
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Specification