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Continuous-detection-mechanism-based anti-collision algorithm for EPC Gen2 protocol

A detection mechanism and anti-collision technology, applied in computing, computer components, electromagnetic radiation induction, etc., can solve problems such as low algorithm efficiency, reduce energy loss, increase the number of labels, and improve the recognition reliability.

Active Publication Date: 2016-10-12
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, in the existing Q algorithm, whether it is a conflict situation or an idle situation, the adjustment step size of the parameter Q is the same
When there are consecutive conflicting time slots or idle time slots, the Q value may remain unchanged despite the increase or decrease adjustment, and the algorithm efficiency is low

Method used

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Embodiment Construction

[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039]The length of the RFID system identification time is not only related to the probability of collision and idle time slot, but also has a great relationship with the duration of the two. For this reason, the present invention combines the parameters in the Gen2 protocol to calculate the duration of the conflict time slot and the idle time slot, and combines the probability of both occurrences to provide an optimized update step size C c and C i . When channels collide, Q fp Increase C c ; When the channel is idle, Q fp reduce C i . The optimized update step size C in the present invention c and C i are two new parameters introduced for idle slots and conflict slots, and the recognition efficiency of the system is the same as C c and C i The ratio is...

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Abstract

The invention, which belongs to the wireless communication field, discloses a continuous-detection-mechanism-based anti-collision algorithm for an EPC Gen2 protocol. The algorithm is characterized in that according to the number of response tags, a reader determines whether a conflict occurs between channels, channels are idle, or tags are read successfully and different processing measures are taken for the three kinds of situations; when a conflict occurs between channels or channels are idle for the first time, a parameter Q of a protocol is not changed and a next communication cycle is carried out continuously; if conflicts occur continuously or channels are idle, the Q is updated respectively by using different updated step lengths; and otherwise, the Q remains unchanged. An instruction sending condition is set; before the reader sends an instruction, whether the Q value is changed is determined; if the Q value changes, the reader sends a query adjust instruction; and otherwise, a QueryRep instruction is sent. According to the algorithm, the performance of the algorithm is not affected by the tag number; and the tag identification rate can be increased obviously.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to an algorithm for reducing information conflicts by adopting a continuous detection mechanism, which is suitable for ultra-high frequency EPC Gen2 protocol. Background technique [0002] EPCglobal Class 1 Generation 2 UHF radio frequency identification protocol (referred to as Gen2 protocol) is the latest RFID air interface protocol released by EPCglobal, including physical layer protocol, Medium Access Control (MAC) protocol and UHF RFID passive tags technical parameters. The Gen2 protocol operates between 860MHz and 960MHz. Compared with other RFID protocol standards, the Gen2 protocol has many advantages, including faster tag reading speed, better security performance, read / write programmability, smooth transition to future EPC standards, etc., which makes it It stands out among many specifications and protocols and is included in the international standard I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/10
CPCG06K7/10019G06K7/10297
Inventor 轩秀巍吕联荣李琨谷成
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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