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    • 1. 发明授权
    • Passive RFID reader and operation control method therefor
    • 被动RFID阅读器及其操作控制方法
    • US08653946B2
    • 2014-02-18
    • US11746306
    • 2007-05-09
    • Ji-Hoon BaeHee-Sook MoDong-Han LeeCheng-Hao QuanChan-Won ParkGil-Young ChoiCheol-Sig PyoJong-Suk Chae
    • Ji-Hoon BaeHee-Sook MoDong-Han LeeCheng-Hao QuanChan-Won ParkGil-Young ChoiCheol-Sig PyoJong-Suk Chae
    • H04Q5/22
    • G06K7/0008G06K7/10356H04W74/08
    • Provided is a Radio Frequency Identification (RFID) reader that can minimize collision among RFID readers in an environment where there are a plurality of RFID readers within a limited operating environment by making each RFID reader select a channel at different delay time based on a random value, and a method for controlling operation of the RFID reader. The RFID reader includes a random value generating unit; a reader control unit for adaptively deciding a counter value for generating the random value; an anti-collision unit for preventing collision among a plurality of tags; a reader transmitting unit for generating a reader command message determined by the anti-collision unit, encoding the reader command message, and modulating the reader command message; a reader receiving unit for demodulating and decoding a tag signal; and a channel operation control unit for selecting a channel to be used for the communication with the tag.
    • 提供了一种射频识别(RFID)读取器,其可以在有限操作环境中存在多个RFID读取器的环境中最小化RFID读取器之间的冲突,使得每个RFID读取器基于随机值在不同的延迟时间选择信道 以及用于控制RFID读取器的操作的方法。 RFID读取器包括随机值生成单元; 读取器控制单元,用于自适应地确定用于生成随机值的计数器值; 用于防止多个标签之间的碰撞的防碰撞单元; 读取器发送单元,用于生成由反冲突单元确定的读取器命令消息,对读取器命令消息进行编码,以及调制读取器命令消息; 读取器接收单元,用于解调和解码标签信号; 以及频道操作控制单元,用于选择要用于与标签进行通信的频道。