Communications: electrical – Selective – Interrogation response
Reexamination Certificate
2005-07-29
2008-09-16
Bugg, George A (Department: 2612)
Communications: electrical
Selective
Interrogation response
C340S010100, C340S010320, C340S010520, C340S005300
Reexamination Certificate
active
07425888
ABSTRACT:
System and methods for optimizing communications between an RFID reader and a population of tags are described. To minimize the amount of data exchanges, the reader and tags use non-sequential bit string or byte masking. In non-sequential bit string masking, the reader transmits an interrogation mask having a plurality of non-sequential sub-masks to the tags. During subsequent collection of the identification sequence, the reader and tags only exchange the non-masked bit positions. The interrogation mask can be determined using superposition processing, historical tendencies, or known identification and/or subset of identification ranges. During superposition processing, the reader determines whether a bit position contains a single value or multiple values for tags in the tag population. If the bit position contains a single value, the bit position is designated as masked. If the bit position contains multiple values, the bit position is designated as non-masked.
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Bugg George A
Lau Hoi C
Sterne Kessler Goldstein & Fox P.L.L.C.
Symbol Technologies Inc.
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