Radio frequency identification multiple tag access method
A radio frequency identification and access method technology, applied in the field of radio frequency identification, can solve the problems of incorrectly transmitting tag information and collisions, and achieve the effects of reducing the probability of tag collisions, accurate probability information, and reducing time delay
Inactive Publication Date: 2008-03-19
ZTE CORP
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When multiple 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
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[0027] In the following, the multi-tag access method of the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
[0028] As shown in Fig. 1, a schematic diagram of the frame structure of the tag reply data involved in the present invention is shown. The feature of the label recovery data frame is that a random pulse burst area is added to the preamble area of the data frame. The random pulse burst area is divided into several sub-time intervals. To send the data frame to the tag of the reader, randomly select one from these sub-time intervals, and generate a high level in the selected sub-time interval Burst of pulses. The remaining time of the random pulse burst area is low. When a time slot starts, all reply tags send data frames synchronously, and the reader side detects burst pulses within a predetermined time window and records the number to determine the number of collision tags in the current time slo...
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The present invention discloses a multi-tag access method applying to identify radio frequency. After being initialized, a reader finishes the select for tags and sends access instructions. A plurality of tags selected to access conduct access replying at a certain probability. The reader detects whether conflicts occur in the tag replying information by using the guiding random impulse conflict detecting method. The reader updates the information accessed to the instructions according to whether conflicts occur and then transfers to the access of a next frame, as well as resends access instructions till tags does not be replied after the reader sends tag access instructions, then the access process is finished, wherein updating the information accessed to the instructions means updating the information of tag replying frames and probability information. The updating is adjusted according to the judgment of replying information received by the reader. The method of the present invention is capable of reducing the probability of tag collision, realizing the access efficiency of multi-tag, reducing access time delay, and increasing access efficiency.
Description
Technical field [0001] The present invention relates to radio frequency identification technology in the field of wireless communication, and in particular to a method for multi-tag access in radio frequency identification. Background technique [0002] In the application of radio frequency identification (RFID) technology, usually one reader corresponds to multiple electronic tags. When multiple tags are connected to the reader at the same time, collisions will occur, and the information in the tags cannot be correctly transmitted to the reader. Therefore, it is necessary to adopt a certain mechanism to avoid or reduce collisions. [0003] In order to quickly and effectively access the tags, in the current international standard ISO 18000-6, the methods of ALOHA and Binary Tree are used to resolve collisions. Among them, the basic feature of ALOHA is that the system divides the tag reply channel into several intervals according to time (this interval is called a time slot), and ...
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IPC IPC(8): G06K7/00
CPCG06K7/10029G06K7/0008
Inventor 王宏刚杨勤曹志华刘源花
Owner ZTE CORP