Wireless identification systems and protocols
First Claim
1. In a system for monitoring location of tags, the system comprising at least two of a monitor, a locator, and a tag, a method performed by at least one of the monitor, the locator, and the tag for transmitting a message, the message comprising a first group of slots and a second group of slots, the method comprising:
- generating a first part of a message by inserting a high or low signal in each slot within a first group of slots, such that the high signals are separated in time by a minimum number of slots;
transmitting the first part of the message; and
transmitting a second part of the message, wherein the second part'"'"'s high and low signals within a second group of slots are in reverse order from those in the first part.
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Accused Products
Abstract
Monitoring systems and protocols are disclosed that are flexible in mode operation and format depending on the environment in which they are used. Such monitoring systems and protocols are able to change their utilization automatically, or by received instruction to do so. A location detection system includes one or more low frequency transmitters, one or more radio frequency monitoring tags and one or more receiving devices. The low frequency transmitter transmits location identification information, such as the transmitter ID, to a tag in the vicinity of the transmission. The tag relays the transmitter ID using a higher frequency transmission sent from the tag to the receiver. Communication protocols are disclosed that enable deciphering of multiple tag transmissions starting simultaneously.
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Citations
26 Claims
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1. In a system for monitoring location of tags, the system comprising at least two of a monitor, a locator, and a tag, a method performed by at least one of the monitor, the locator, and the tag for transmitting a message, the message comprising a first group of slots and a second group of slots, the method comprising:
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generating a first part of a message by inserting a high or low signal in each slot within a first group of slots, such that the high signals are separated in time by a minimum number of slots; transmitting the first part of the message; and transmitting a second part of the message, wherein the second part'"'"'s high and low signals within a second group of slots are in reverse order from those in the first part. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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2. In a system for monitoring location of tags, the system comprising at least two of a monitor, a locator, and a tag, a method performed by at least one of the monitor, the locator, and the tag for transmitting a message, the message comprising a first group of slots and a second group of slots, the method comprising:
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generating a first part of a message by inserting a high or low signal in each slot within a first group of slots, such that the high signals are separated in time by a minimum number of slots; transmitting the first part of the message; and transmitting a second part of the message, wherein the second part'"'"'s high and low signals within a second group of slots are inverse in magnitude from those in the first part.
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3. In a system for monitoring location of tags, the system comprising at least two of a monitor, a locator, and a tag, a method performed by at least one of the monitor, the locator, and the tag for transmitting a message, the message comprising a first group of slots and a second group of slots, the method comprising:
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generating a first part of a message by inserting high or low signal in each slot within a first group of slots, such that the high signals are separated in time by a minimum number of slots; transmitting the first part of the message; and transmitting a second part of the message, wherein the second part'"'"'s high and low signals within a second group of slots are inverse in time and magnitude from those in the first part.
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14. A system for monitoring location of tags, the system comprising a monitor, a plurality of locators, and a plurality of tags, communication from a sender, being at least one of the monitor, a particular locator, and a particular tag, comprising a message that includes a first group of slots and a second group of slots, the sender comprising:
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means for generating a first part of a message by inserting a high or low signal in each slot within a first group of slots, such that the high signals are separated in time by a minimum number of slots; means for transmitting the first part of the message; and means for transmitting a second part of the message, wherein the second part'"'"'s high and low signals within a second group of slots are in reverse order from those in the first part. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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15. A system for monitoring location of tags, the system comprising a monitor, a plurality of locators, and a plurality of tags, communication from a sender, being at least one of the monitor, a particular locator, and a particular tag, comprising a message that includes a first group of slots and a second group of slots, the sender comprising:
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means for generating a first part of a message by inserting a high or low signal in each slot within a first group of slots, such that the high signals are separated in time by a minimum number of slots; means for transmitting the first part of the message; and means for transmitting a second part of the message, wherein the second part'"'"'s high and low signals within a second group of slots are inverse in magnitude from those in the first part.
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16. A system for monitoring location of tags, the system comprising a monitor, a plurality of locators, and a plurality of tags, communication from a sender, being at least one of the monitor, a particular locator, and a particular tag, comprising a message that includes a first group of slots and a second group of slots, the sender comprising:
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means for generating a first part of a message by inserting high or low signal in each slot within a first group of slots, such that the high signals are separated in time by a minimum number of slots; means for transmitting the first part of the message; and means for transmitting a second part of the message, wherein the second part'"'"'s high and low signals within a second group of slots are inverse in time and magnitude from those in the first part.
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Specification