Location localization
First Claim
1. A method comprising:
- transmitting, by an RFID tag reader, a first request for locating a first passive RFID tag in a first facility;
determining, by said RFID tag reader, a maximum distance between said first passive RFID tag and a plurality of active RFID tags, wherein said maximum distance comprises a radius of a specified circular area;
receiving, by said RFID tag reader from a first group of active RFID tags of said plurality of active RFID tags in response to said first request, a first date/time associated with first data, wherein said first date and time are comprised by a first time stamp, and wherein said first group of active RFID tags are located in said first facility;
receiving, by said RFID tag reader from a second group of active RFID tags of said plurality of active RFID tags in response to said first request, a second date/time associated with second data, wherein said second date and time are comprised by a second time stamp, and wherein said second group of active RFID tags are located in said first facility;
determining, by said RFID tag reader, that said first date/time comprises an earlier date/time than said second date/time with respect to a current date/time;
transmitting, by said RFID tag reader to said second group of active RFID tags in response to said determining that said first date/time comprises an earlier date/time than said second date/time, a second request for retrieving said second data, wherein said second data comprises an ID for said first passive RFID tag and distances between each active RFID tag of said second group and said first passive RFID tag;
receiving, by said RFID tag reader from said second group of active RFID tags, said second data;
receiving, by said RFID tag reader from a computing system, a map of said facility and first locations on said map for said second group of active RFID tags;
determining, by said RFID tag reader, a first location within said facility for said first passive RFID tag, wherein said determining said first location is based on said second data, said map of said facility, and said first locations on said map for said second group of active RFID tags; and
transmitting, by said RFID tag reader to a user, said first location.
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Abstract
A location localization method and system. The method includes transmitting by an RFID tag reader, a request for locating a passive RFID tag in a facility. The RFID tag reader receives from active RFID tags, a first date/time associated with first data. The RFID tag reader transmits to the active RFID tags, a request for retrieving the first data. The first data comprises distances between each active RFID tag and the passive RFID tag. The RFID tag reader receives the first data. The RFID tag reader receives a map of the facility and locations on the map for the active RFID tags. The RFID tag reader determines a location within the facility for the passive RFID tag based on the first data, the map, and the locations on the map. The RFID tag reader transmits the first location to a user.
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Citations
19 Claims
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1. A method comprising:
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transmitting, by an RFID tag reader, a first request for locating a first passive RFID tag in a first facility; determining, by said RFID tag reader, a maximum distance between said first passive RFID tag and a plurality of active RFID tags, wherein said maximum distance comprises a radius of a specified circular area; receiving, by said RFID tag reader from a first group of active RFID tags of said plurality of active RFID tags in response to said first request, a first date/time associated with first data, wherein said first date and time are comprised by a first time stamp, and wherein said first group of active RFID tags are located in said first facility; receiving, by said RFID tag reader from a second group of active RFID tags of said plurality of active RFID tags in response to said first request, a second date/time associated with second data, wherein said second date and time are comprised by a second time stamp, and wherein said second group of active RFID tags are located in said first facility; determining, by said RFID tag reader, that said first date/time comprises an earlier date/time than said second date/time with respect to a current date/time; transmitting, by said RFID tag reader to said second group of active RFID tags in response to said determining that said first date/time comprises an earlier date/time than said second date/time, a second request for retrieving said second data, wherein said second data comprises an ID for said first passive RFID tag and distances between each active RFID tag of said second group and said first passive RFID tag; receiving, by said RFID tag reader from said second group of active RFID tags, said second data; receiving, by said RFID tag reader from a computing system, a map of said facility and first locations on said map for said second group of active RFID tags; determining, by said RFID tag reader, a first location within said facility for said first passive RFID tag, wherein said determining said first location is based on said second data, said map of said facility, and said first locations on said map for said second group of active RFID tags; and transmitting, by said RFID tag reader to a user, said first location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An RFID tag reader comprising a processor coupled to a computer-readable memory unit, said memory unit comprising instructions that when executed by the processor implements a location localization method, said method comprising:
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transmitting, by said RFID tag reader, a first request for locating a first passive RFID tag in a first facility; determining, by said RFID tag reader, a maximum distance between said first passive RFID tag and a plurality of active RFID tags, wherein said maximum distance comprises a radius of a specified circular area; receiving, by said RFID tag reader from a first group of active RFID tags of said plurality of active RFID tags in response to said first request, a first date/time associated with first data, wherein said first date and time are comprised by a first time stamp, and wherein said first group of active RFID tags are located in said first facility; receiving, by said RFID tag reader from a second group of active RFID tags of said plurality of active RFID tags in response to said first request, a second date/time associated with second data, wherein said second date and time are comprised by a second time stamp, and wherein said second group of active RFID tags are located in said first facility; determining, by said RFID tag reader, that said first date/time comprises an earlier date/time than said second date/time with respect to a current date time; transmitting, by said RFID tag reader to said second group of active RFID tags in response to said determining that said first date/time comprises an earlier date/time than said second date/time, a second request for retrieving said second data, wherein said second data comprises an ID for said first passive RFID tag and distances between each active RFID tag of said second group and said first passive RFID tag; receiving, by said RFID tag reader from said second group of active RFID tags, said second data; receiving, by said RFID tag reader from a computing system, a map of said facility and first locations on said map for said second group of active RFID tags; determining, by said RFID tag reader, a first location within said facility for said first passive RFID tag, wherein said determining said first location is based on said second data, said map of said facility, and said first locations on said map for said second group of active RFID tags; and transmitting, by said RFID tag reader to a user, said first location. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A computer program product, comprising a computer readable storage device comprising a computer readable program code embodied therein, said computer readable program code configured to perform a method upon being executed by a processor of said RFID tag reader, said method comprising:
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transmitting, by said RFID tag reader, a first request for locating a first passive RFID tag in a first facility; determining, by said RFID tag reader, a maximum distance between said first passive RFID tag and a plurality of active RFID tags, wherein said maximum distance comprises a radius of a specified circular area; receiving, by said RFID tag reader from a first group of active RFID tags of said plurality of active RFID tags in response to said first request, a first date/time associated with first data, wherein said first date and time are comprised by a first time stamp, and wherein said first group of active RFID tags are located in said first facility; receiving, by said RFID tag reader from a second group of active RFID tags of said plurality of active RFID tags in response to said first request, a second date/time associated with second data, wherein said second date and time are comprised by a second time stamp, and wherein said second group of active RFID tags are located in said first facility; determining, by said RFID tag reader, that said first date/time comprises an earlier date/time than said second date/time with respect to a current date time; transmitting, by said RFID tag reader to said second group of active RFID tags in response to said determining that said first date/time comprises an earlier date/time than said second date/time, a second request for retrieving said second data, wherein said second data comprises an ID for said first passive RFID tag and distances between each active RFID tag of said second group and said first passive RFID tag; receiving, by said RFID tag reader from said second group of active RFID tags, said second data; receiving, by said RFID tag reader from a computing system, a map of said facility and first locations on said map for said second group of active RFID tags; determining, by said RFID tag reader, a first location within said facility for said first passive RFID tag, wherein said determining said first location is based on said second data, said map of said facility, and said first locations on said map for said second group of active RFID tags; and transmitting, by said RFID tag reader to a user, said first location.
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Specification