SCREENING TRANSMISSIONS FOR POWER LEVEL AND OBJECT IDENTIFIER IN ASSET MONITORING AND TRACKING SYSTEMS
4 Assignments
0 Petitions
Accused Products
Abstract
A method for communicating to a recipient transceiver from a plurality of transceivers located within the broadcast range of the recipient transceiver includes: transmitting a communication at a first power level such that only a first group of transceivers receive the broadcast, the communication including a command causing each of the first group of transceivers not to respond to a subsequent broadcast; and subsequent thereto, transmitting a communication at a second power level greater than the first power level such that a second group of transceivers greater than and including the first group of transceivers receive the broadcast, but such that only a limited number of transceivers of the second group respond to the broadcast, the limited number of transceivers excluding the first group of transceivers. Each of the plurality of transceivers is associated with a respective sensor for acquiring data and transmitting the data to the recipient transceiver.
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Citations
39 Claims
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1-20. -20. (canceled)
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21. An RFID monitoring device comprising:
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a memory having unique identifying information stored therein and having codes representing at least two different transmitter power levels stored therein; an antenna for transmitting and receiving electromagnetic signals; a modulator coupled to said memory for modulating the unique identifying information and the transmitter power level codes stored in said memory; and a transmitter coupled to said modulator and to said antenna for transmitting at least two messages via said antenna, wherein each of the at least two messages includes the modulated unique identifying information and a modulated different one of the transmitter power level codes, wherein the power level of said transmitter is controlled responsive to the power level code to correspond to the power level represented by the power level code in each transmitted message when each message is transmitted; whereby the transmitter power level is different for each of the messages and corresponds to the power level code contained in each of the messages transmitted; and wherein the RFID monitoring device is configured to wirelessly communicate to a recipient transceiver from a plurality of transceivers, the plurality of transceivers being located within the broadcast range of the RFID monitoring device, by; transmitting a communication at a first power level such that only a first group of transceivers receive the broadcast, the communication including a command causing each of the first group of transceivers not to respond to a subsequent broadcast; and subsequent thereto transmitting a communication at a second power level greater than the first power level such that a second group of transceivers greater than and including the first group of transceivers receive the broadcast, but such that only a limited number of transceivers of the second group respond to the broadcast, the limited number of transceivers excluding the first group of transceivers; wherein the plurality of transceivers each are associated with a respective sensor for acquiring data and transmitting the data to the RFID monitoring device. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A two-way wireless radio-frequency data communication device comprising:
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a memory having a unique identification stored therein and having codes representing at least two different transmitter power levels stored therein; an antenna for transmitting and receiving electromagnetic signals; a modulator coupled to said memory for modulating the unique identification and the transmitter power level codes stored in said memory; and a transmitter coupled to said modulator and to said antenna for transmitting at least two messages via said antenna, wherein each of the at least two messages includes the modulated unique identification and a modulated different one of the transmitter power level codes, wherein the power level of said transmitter is controlled responsive to the power level code to correspond to the power level represented by the power level code in each transmitted message when each message is transmitted; whereby the transmitter power level is different for each of the messages and corresponds to the power level code contained in each of the messages transmitted; and wherein the two-way wireless radio-frequency data communication device is configured to wirelessly communicate with a plurality of transceivers, the plurality of transceivers being located within the broadcast range of the two-way wireless radio-frequency data communication device, by; transmitting a communication at a first power level such that only a first group of transceivers receive the broadcast, the communication including a command causing each of the first group of transceivers not to respond to a subsequent broadcast; and subsequent thereto transmitting a communication at a second power level greater than the first power level such that a second group of transceivers greater than and including the first group of transceivers receive the broadcast, but such that only a limited number of transceivers of the second group respond to the broadcast, the limited number of transceivers excluding the first group of transceivers; wherein the plurality of transceivers each are associated with a respective sensor for acquiring data and transmitting the data to the two-way wireless radio-frequency data communication device. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36)
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37. A gateway comprising a two-way wireless radio-frequency data communication device configured to communication over a wide area network (WAN), and comprising:
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a memory having a unique identification stored therein and having codes representing at least two different transmitter power levels stored therein; an antenna for transmitting and receiving electromagnetic signals; a modulator coupled to said memory for modulating the unique identification and the transmitter power level codes stored in said memory; and a transmitter coupled to said modulator and to said antenna for transmitting at least two messages via said antenna, wherein each of the at least two messages includes the modulated unique identification and a modulated different one of the transmitter power level codes, wherein the power level of said transmitter is controlled responsive to the power level code to correspond to the power level represented by the power level code in each transmitted message when each message is transmitted; whereby the transmitter power level is different for each of the messages and corresponds to the power level code contained in each of the messages transmitted; and wherein the gateway is configured to wirelessly communicate with a plurality of transceivers, the plurality of transceivers being located within the broadcast range of the gateway, by; transmitting a communication at a first power level such that only a first group of transceivers receive the broadcast, the communication including a command causing each of the first group of transceivers not to respond to a subsequent broadcast; and subsequent thereto transmitting a communication at a second power level greater than the first power level such that a second group of transceivers greater than and including the first group of transceivers receive the broadcast, but such that only a limited number of transceivers of the second group respond to the broadcast, the limited number of transceivers excluding the first group of transceivers; wherein the plurality of transceivers each are associated with a respective sensor for acquiring data and transmitting the data to the gateway for communication over the WAN. - View Dependent Claims (38, 39)
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Specification