WAKE UP DEVICE FOR COMMUNICATIONS SYSTEM AND METHODS
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Abstract
The present invention teaches a communications system comprising a first communications device for receiving data and a wake up signal. The first communications device comprises an active mode of operation and a sleep mode of operation for reducing power consumption. Further, the system comprises means for switching the first communications device to and from sleep mode in response to receiving the wake up signal. Further, the system comprises a second communications device for transmitting data to the first device during its active mode, while transmitting the wake up signal to the first device during its sleep mode.
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Citations
25 Claims
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1-5. -5. (canceled)
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6. A method of tracking an item of inventory comprised of a radio frequency device, the method comprising:
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positioning an interrogation apparatus in a first region, the interrogation apparatus comprising a transceiver communicatively coupled to an antenna, the interrogator unit being configured to transmit radio frequency (RF) signals; interrogating the item of inventory by transmitting via the transceiver an RF signal; causing a transitioning to a first mode by the radio frequency device when the radio frequency device determines that the RF signal is at a first frequency and a first data rate; causing a transitioning to a second mode by the radio frequency device when the radio frequency device determines that the RF signal is at a second frequency and a second data rate; and tracking the item of inventory using at least the acts of interrogating and transitioning; wherein the radio frequency device is configured to remain in the first mode until transitioning into the second mode upon receipt of the RF signal at the second frequency and the second data rate; and wherein the radio frequency device is configured to remain in the second mode until transitioning into the first mode upon receipt of the RF signal at the first frequency and the first data rate. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method of tracking an item of inventory comprised of a radio frequency device, the method comprising:
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tagging the item with a radio frequency device; placing the radio frequency device in a first mode of operation; transitioning the radio frequency device into a second mode of operation by transmitting an RF signal at a second frequency and having a second bandwidth parameter; tracking the item of inventory; and transitioning the radio frequency device back into the first mode of operation by transmitting an RF signal at a first frequency and having a first bandwidth parameter. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method of tracking an item of inventory, the item having a radio frequency device associated therewith, the method comprising:
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causing the radio frequency device to transition into a first mode of operation by transmitting an RF signal at a first frequency and having a first envelope attribute; and causing the radio frequency device to transition into a second mode of operation by transmitting an RF signal at a second frequency and a second envelope attribute; wherein the item of inventory is tracked in one of said first or second modes of operation. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification