Method for implementing radio frequency access by utilization of anti-collision
An anti-collision and radio frequency technology, applied in the field of radio frequency identification, can solve the problems of tag end collision, waste of time slots, and reduce tag access efficiency, etc., to achieve the effect of reducing the number of time slots, reducing the counting time, and improving the counting efficiency
Inactive Publication Date: 2011-03-02
ZTE INTELLIGENT IOT TECH
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Problems solved by technology
Especially if the number of tags in the current time slot is large, the tag ends will collide continuously, which wastes a lot of time slots and reduces the access efficiency of tags
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[0073] The invention effectively improves the Binary Tree, adopts the idea of the dynamic tree, and can change the splitting degree of the collision tags in the current time slot. Therefore, the number of label collisions is reduced, the probability of idle time slots is reduced, and the access efficiency of multiple labels is improved.
[0074] The reader can obtain the situation of the current time slot from the reply information of the tag, so as to determine whether to adjust the degree of tag splitting.
[0075] The current time slot state can be divided into three situations: idle time slot, identifiable time slot and unrecognizable time slot, and each time slot state represents the splitting situation of the tags to be counted in the current time slot. Among them, an idle time slot indicates that the tag is excessively split, an identifiable time slot indicates that the label is moderately split, and an unrecognizable time slot indicates that the label needs to be spl...
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The invention discloses a method for realizing RF access by using anti-collision which includes steps as follows: a split rule is defined and a dynamic tree counter is set in a reader; the reader sends an access indication to a label in effective RF field area and initializes the dynamic tree counter; the label responds the access indication, the label account initiates access after is set zero; the reader receives the label in present time slot, when the reader knows collision occurring in present time slot according with received label return information, the dynamic tree fork amount is confirmed by the split rule, and sends the dynamic tree fork amount to the label according with the failure confirming indication, the dynamic tree fork amount in the failure confirming indication is N, N is a natural number; the label processes split to the label with account value zero according with the dynamic tree fork in the failure confirming indication, the split range is from zero to N-1; non-zero account value of the label adds N-1, the label with the account value zero after splitting is accessed continuously.
Description
technical field [0001] The invention relates to a radio frequency identification (RFID) technology, in particular to a method for realizing radio frequency access by using anti-collision. Background technique [0002] In the application of RFID technology, usually one reader corresponds to multiple tags. When multiple electronic tags are connected to the reader at the same time, collisions will occur, so the information in the tags cannot be correctly transmitted to the reader. Therefore, certain mechanisms need to be adopted to avoid collisions or reduce collisions. [0003] In the current international standard ISO 18000-6TypeB, the method of Binary Tree (binary tree) is adopted to solve the collision. Each tag has a random number generator that generates 0 or 1; each tag has a counter, and when the value of the counter is 0, the tag replies. The reader sends an instruction to make all tags start to reply. After receiving the instruction, the tag first generates 0 or 1 ...
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IPC IPC(8): G06K7/00
Inventor 林立
Owner ZTE INTELLIGENT IOT TECH