Method and system for optimizing an interrogation of a tag population
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04Q-005/22
H04Q-005/00
출원번호
US-0403019
(2003-04-01)
발명자
/ 주소
Arneson,Michael R.
Bandy,William R.
출원인 / 주소
Symbol Technologies, Inc.
대리인 / 주소
Sterne, Kessler, Goldstein &
인용정보
피인용 횟수 :
51인용 특허 :
74
초록▼
A method and system for optimizing an interrogation of a tag population that includes a plurality of tags, wherein each of the plurality of tags is assigned a tag address includes determining a tag population size; selecting one of a plurality of efficiency profiles that matches the determined tag p
A method and system for optimizing an interrogation of a tag population that includes a plurality of tags, wherein each of the plurality of tags is assigned a tag address includes determining a tag population size; selecting one of a plurality of efficiency profiles that matches the determined tag population size; and defining a plurality of interrogation read cycles according to the selected efficiency profile.
대표청구항▼
What is claimed is: 1. A method of optimizing an interrogation of a tag population that includes a plurality of tags, wherein each of the plurality of tags is assigned a tag address, the method comprising the steps of: (a) estimating a tag population size; (b) selecting one of a plurality of effici
What is claimed is: 1. A method of optimizing an interrogation of a tag population that includes a plurality of tags, wherein each of the plurality of tags is assigned a tag address, the method comprising the steps of: (a) estimating a tag population size; (b) selecting one of a plurality of efficiency profiles based on said estimated tag population size, wherein said efficiency profile defines a number of time slots allocated to one or more read cycles; and (c) selecting a different efficiency profile based on a duration of said one or more read cycles. 2. The method of claim 1, wherein step (b) comprises the step of aligning a maximum of one of the plurality of efficiency profiles with the estimated tag population size. 3. The method of claim 1, wherein each of the efficiency profiles provides interrogation efficiency metrics for a plurality of tag population sizes. 4. The method of claim 1, wherein step (b) comprises the step of allocating a number of time slots to a corresponding one of the plurality of read cycles. 5. The method of claim 1, wherein step (c): measuring interrogation efficiency during a measurement epoch; determining whether the measured interrogation efficiency is acceptable; and repeating steps (a) and (b) if the measured interrogation efficiency is not acceptable. 6. The method of claim 1, wherein step (c) comprises the steps of: measuring interrogation efficiency during a measurement epoch; determining whether the measured interrogation efficiency is acceptable; and repeating steps (a) and (b) if the measured interrogation efficiency is not acceptable. 7. The method of claim 5, wherein said measuring step comprises the step of calculating: description="In-line Formulae" end="lead"E=T min/Tactual, wherein:description="In-line Formulae" end="tail" E is the interrogation efficiency; Tactual is the actual time taken to perform an interrogation of a tag population; and Tmin is the minimum possible time required to perform an interrogation of the tag population. 8. The method of claim 5, wherein the measurement epoch includes one or more interrogations. 9. The method of claim 1, wherein the tag address is a UPC code plus a serial number that give substantial uniqueness to all products within that particular UPC code. 10. The method of claim 1, wherein the tag address includes a first portion comprising a hashing code, which is computed from the remainder of the tag address. 11. The method of claim 10, wherein the hashing code is a cyclic redundancy check (CRC). 12. The method of claim 1, wherein said number of time slots in a first read cycle is different than said number of time slots in a second read cycle for said selected efficiency profile. 13. The method of claim 1, wherein said tag address includes a plurality of a sub-address. 14. A system for optimizing an interrogation of a tag population that includes a plurality of tags, wherein each of the plurality of tags is assigned a tag address, comprising: means for estimating a tag population size; means for selecting one of a plurality of efficiency profiles based on said estimated tag population size, wherein said efficiency profile defines a number of time slots allocated to one or more read cycles; and means for selecting a different efficiency profile based on a duration of said one or more read cycles. 15. The system of claim 14, wherein said selecting one of a plurality of efficiency profiles means comprises means for aligning a maximum of one of the plurality of efficiency profiles with the estimated tag population size. 16. The system of claim 14, wherein each of the efficiency profiles provides interrogation efficiency metrics for a plurality of tag population sizes. 17. The system of claim 14, wherein said means for selecting one of a plurality of efficiency profiles comprises means for allocating a number of time slots to a corresponding one of the plurality of read cycles. 18. The system of claim 14, wherein said means for selecting a different efficiency profile comprises: means for measuring interrogation efficiency during a measurement epoch; and means for determining whether the measured interrogation efficiency is acceptable. 19. The system of claim 18, wherein the determining means comprises means for determining whether the measured interrogation efficiency is greater than a predetermined threshold. 20. The system of claim 18, wherein said measuring means comprises the means for calculating: description="In-line Formulae" end="lead"E=T min/Tactual, wherein:description="In-line Formulae" end="tail" E is the interrogation efficiency; Tactual is the actual time taken to perform an interrogation of a tag population; and Tmin is the minimum possible time required to perform an interrogation of the tag population. 21. The system of claim 18, wherein the measurement epoch includes one or more interrogations. 22. The system of claim 14, wherein the tag address is a UPC code plus a serial number that give substantial uniqueness to all products within that particular UPC code. 23. The system of claim 14, wherein the tag address includes a first portion comprising a hashing code, which is computed from the remainder of the tag address. 24. The system of claim 23, wherein the hashing code is a cyclic redundancy check (CRC). 25. The system of claim 14, wherein said number of time slots in a first read cycle is different than said number of time slots in a second read cycle for said selected efficiency profile. 26. The system of claim 14, wherein said tag address includes a plurality of a sub-address.
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이 특허에 인용된 특허 (74)
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