Research on Preventing Consecutive Collision Algorithm for Real TimeLocation Transmit-Only Tags

In the real-time locating system based on RFID technology used in underground coal mines, the active transmit-only tags are commonly used. When the identity number signals transmitted by several tags are overlapped in terms of the time, there will be collision, which may result in omitted reading of the card reader. Generally, the periodical transmission of tags will lead to consecutive collision, which will increase the omission rate. As such, this paper designed an Identity number Based Blink Interval Generating Algorithm (IBBIGA) that can be used to generate several blink intervals for each tag without a random number. This algorithm effectively prevents consecutive collision and guarantees an equal average blink interval of each tag. Through simulation analysis, compared with the blink interval generation method used in ALOHA protocol and INCTITS371.1 protocol, IBBIGA has a lower omission rate.

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