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Multi-reader RFID system quick tag identification method based on time slot division

A technology of tag identification and time slot division, applied in the direction of instruments, electromagnetic radiation induction, induction record carriers, etc., can solve the problem of impossible to solve the reader-tag conflict, etc., to improve throughput, eliminate RT conflicts, and reduce impact. Effect

Active Publication Date: 2017-03-15
HUNAN UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the slot order of each reader is random, it is impossible to solve the reader-tag conflict based on the traditional EPC C1G2 protocol

Method used

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  • Multi-reader RFID system quick tag identification method based on time slot division
  • Multi-reader RFID system quick tag identification method based on time slot division
  • Multi-reader RFID system quick tag identification method based on time slot division

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Embodiment Construction

[0043] The present invention observes that all readers need to perform the same behavior of collecting RN in each time slot: the reader broadcasts QueryRep in each time slot, and waits for the tag to send RN(s). Only when the reader successfully receives an RN can the reader ask the tag to send its ID by replying with an ACK including the received RN. Single slot has the longest time because it requires ID transmission. If the reader only collects RN(s) in a single slot and does not reply with ACKs (thus not causing ID transmission), then the single slot will have the same duration as the collision slot. That is, the reader sends a QueryRep command directly after receiving the RN(s) from the tag to start the next time slot. Also, if the duration of the empty slot is extended to be the same as the collision slot / single slot, then all readers will perform a synchronous operation, i.e. they will simultaneously send QueryRep commands and receive RNs from tags (or wait, but this ...

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Abstract

The invention discloses a multi-reader RFID (Radio Frequency Identification) system quick tag identification method based on time slot division. The multi-reader RFID system quick tag identification method based on time slot division includes the following steps: in the first step, when a frame starts, a reader group broadcasts a query command to a tag, and then waits for receiving the reply from the tag; when the reader group successfully receives the tag inquired by one reader according to the parameters contained in the query command, the reader group uses a Hash function to select the reply time slot, and then the tag returns the built-in RN to the reader in the selected time slot; in the time slot, if the reader successfully receives the RN, the reader records the RN, and other readers which do not receive the RN or the readers which detect signal conflict wait for a moment uniformly, and then the reader group synchronously sends one QueryRep command to start a new time slot; in the second step, in every time slot, all the readers in the reader group send the ACK of the respective received RN previously; and the tags with the same RN send the IDs of the tags to the readers. The multi-reader RFID system quick tag identification method based on time slot division can fully eliminate RT conflict.

Description

technical field [0001] The invention relates to a multi-reader RFID system fast label identification method based on time slot division. Background technique [0002] Radio Frequency Identification (RFID) technology is widely used in many fields today, including supply chain monitoring, warehouse management and inventory control. In these applications, physical objects are tagged with passive or active RFID tags, each tag containing a unique ID. An RFID reader detects the presence of an object by collecting the ID of the attached tag through a wireless channel. Because of the limited interrogation area of ​​the readers, large-scale RFID systems usually deploy multiple readers to cooperate to cover all tags. However, in a multi-reader RFID system, there are three important conflicts between tags and readers: tag-tag (Tag-Tag, TT) conflict, reader-tag (RT) conflict and reader-reader (RR) Conflict. Its definition is as follows (see Figure 1 for the schematic diagram): [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/10
CPCG06K7/10039
Inventor 刘璇关点
Owner HUNAN UNIV
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