Title:
ノイズが存在する無線の存在上で唯一の識別番号を持つ無線周波数識別タグの集合を効率よく読み取るための方法
Document Type and Number:
Japanese Patent JP2006503502
Kind Code:
A
Abstract:
A method for reading and tracking radio frequency identification (RFID) tags in the presence of a noisy air channel is provided. In accordance with the method, a binary tree data structure is used to characterize a plurality of RFID tags, each of which is associated with a unique identification (ID) number. During communication between a tag reader and one or more RFID tags, the tag reader traverses the binary tree, eliminating tags from communication until one tag with a unique ID number is isolated and verified. As the binary tree is traversed, counters associated with each node in the tree are incremented based on tag matches, such that, over time, counters associated with nodes in tag-populated branches will tend to have a high value and counters associated with nodes in unpopulated tree branches will tend to have low values. Where the read process is subject to noise and the tag reader is forced make a decision at a branching node, the tag reader makes a branch prediction based on the current value of the node counters associated with each of the possible alternative branches.
Inventors:
Shanks, Wayne Yi.
Arnold, Jens
Arnold, Jens
Application Number:
JP2004545489A
Publication Date:
January 26, 2006
Filing Date:
October 20, 2003
Export Citation:
Assignee:
Symbol Technologies, Inc.
International Classes:
H04B5/02; G06K7/00; G06K17/00; G06K19/07; H04B1/59
Attorney, Agent or Firm:
Hidesaku Yamamoto
Takaaki Yasumura
Natsuki Morishita
Takaaki Yasumura
Natsuki Morishita