Reading device and label communication method for preventing reading device collision
A reader and tag technology, which is applied in the field of reader-tag communication to prevent reader collision, can solve problems such as incomplete fit, and achieve the effect of improving efficiency
Inactive Publication Date: 2010-06-09
SERVICE CENT OF COMMLIZATION OF RES FINDINGS HAIAN COUNTY
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Problems solved by technology
Q-Learning assumes that readers have the ability to detect collisions. In its dynamic processing method, it proposes how to detect collisions in a dense environment of readers, but this structure is not completely suitable for general RFID applications.
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Embodiment Construction
[0040] Phase 1: Build a reader collision network.
[0041](1) In a dense reader environment, the probability of reader collision is high, which means that the effective reading area of one reader sometimes overlaps with the reading areas of multiple readers.
[0042] (2) Build a reader collision network. Such as figure 1 As shown, a fully undirected multigraph G(V,E) is used to represent the network of interconnected readers. Among them: the collection of nodes V={v1, v2,...vn} represents the collection of readers in the RFID system; E is the collection of edges, if the reading areas of the readers represented by v1 and v2 overlap, then in the collection E There is an edge e (e∈E) connecting v1 and v2, that is, if there is a potential collision between two readers, there is an edge in the reader collision network to represent it. For example, reader 2 may collide with readers 1, 3, 4, 5, and 9, then node 2 and nodes 1, 3, 4, 5, and 9 are connected by edges.
[0043] (3) ...
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The invention relates to a method for communication between a reader and a label, which can prevent reader collision. The currently proposed method for preventing reader collision has various defects.The invention firstly constructs a reader collision network in a reader intensive environment; in the network, each reader forms a node and comprises a collision meter and a collision register. Before communicating with the label within the communication scope, each reader judges the collision register, and under the condition that collision cannot occur, the reader sends out a command that the communication is started and declares that the reader obtains the right of possession to communicate with the label; after the communication between the reader and the label is finished, the reader sends out the command that the communication is finished and declares that the reader releases the right of possession to communicate with the label. The method can not only avoid that the collision is generated by the communication between the reader and the label at the same time when the possibility of collision exists in the reader, and eliminate mutual interference, but also allow a plurality ofthe readers to work simultaneously on the premise that the reader collision does not occur.
Description
technical field [0001] The invention belongs to the technical field of radio frequency identification (RFID), and in particular relates to a reader-tag communication method for preventing reader collision. Background technique [0002] Radio Frequency Identification (RFID) technology is a non-contact automatic identification technology. It identifies targets and exchanges data via radio frequency. The RFID system generally consists of two parts: electronic tags and readers. All readers and radio frequency tags in the same RFID system work in the same frequency band. Generally speaking, within the effective range of a reader, only one reader is enough, but in the current RFID application, in order to improve the reading speed and accuracy, it is necessary to arrange multiple readers to form a number of readers and Tag- and reader-dense environments with a large number of tags. When multiple readers are effective for the same RF tag, it is possible that multiple readers op...
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IPC IPC(8): G06K7/00
Inventor 马琪吕炳赟潘剑侠肖自铧孙玲玲
Owner SERVICE CENT OF COMMLIZATION OF RES FINDINGS HAIAN COUNTY