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    • 3. 发明授权
    • Data transmission method and apparatus in RFID and remote sensor systems
    • RFID和远程传感器系统中的数据传输方法和装置
    • US08552837B2
    • 2013-10-08
    • US13041222
    • 2011-03-04
    • Ulrich Friedrich
    • Ulrich Friedrich
    • G01S13/74
    • G06K7/10297G06K7/0008
    • A method and apparatus is provided for data transmission in RFID and remote sensor systems with at least one reader and a plurality of transponders or remote sensors being located in an electromagnetic field of the reader, in which a multipart return link header containing transmission parameters for the return link, such as timing or modulation references, is transmitted at the beginning of a return link transmission of useful data from a transponder or sensor to a reader. A relative time duration of individual subsymbols of the return link header is modified to select a data transfer mode from among a number of different data transfer modes. A combination of different return link transmission mechanisms is thereby possible, whereby these are mutually compatible and moreover are simple to realize in terms of circuitry and control engineering.
    • 提供了一种用于RFID和远程传感器系统中的数据传输的方法和装置,其中至少一个读取器和多个转发器或远程传感器位于读取器的电磁场中,其中多部分返回链路报头包含用于 返回链路,例如定时或调制参考,在从应答器或传感器到读取器的有用数据的返回链路传输开始时被传送。 修改返回链接头的各个子符号的相对持续时间,以从多个不同的数据传送模式中选择数据传送模式。 因此,不同的返回链路传输机制的组合是可能的,由此它们是相互兼容的,并且在电路和控制工程方面也是简单实现的。
    • 4. 发明授权
    • Method, system, and integrated circuit for communication in RFID or remote sensor systems
    • 用于RFID或远程传感器系统通信的方法,系统和集成电路
    • US08477017B2
    • 2013-07-02
    • US13290545
    • 2011-11-07
    • Ulrich Friedrich
    • Ulrich Friedrich
    • G08C17/02
    • G06K7/0008G06K7/10019
    • In certain embodiments, a method may include receiving, at one of a plurality of remote units, a command from a control unit. The method may also include determining a random number specifying a time slot of a first series of time slots for transmitting a second data sequence to the control unit, and, in response to a determination that the random number specifies the first time slot in the first series of time slots, determining a new random number. The method may further include transmitting, in the first time slot in the first series of time slots, a first data sequence to the control unit. The method may further include receiving a control signal. The control signal having been transmitted by the control unit upon detection of an at least partially simultaneous transmission of first data sequences by more than one of the remote units.
    • 在某些实施例中,一种方法可以包括在多个远程单元之一处接收来自控制单元的命令。 该方法还可以包括确定指定用于向控制单元发送第二数据序列的第一系列时隙的时隙的随机数,并且响应于确定随机数指定第一时隙中的第一时隙 一系列时隙,确定一个新的随机数。 该方法还可以包括在第一系列时隙的第一时隙中向控制单元发送第一数据序列。 该方法还可以包括接收控制信号。 控制单元在检测到多于一个远程单元的至少部分同时传输第一数据序列时由控制单元发送。
    • 5. 发明授权
    • Transponder, RFID system, and method for RFID system with key management
    • 应答器,RFID系统以及具有密钥管理的RFID系统的方法
    • US08296852B2
    • 2012-10-23
    • US11822309
    • 2007-07-05
    • Ulrich Friedrich
    • Ulrich Friedrich
    • H04L29/06
    • H04L9/3066H04L2209/805
    • A transponder is provided, in particular a passive and/or backscatter-based transponder, for an RFID system, wherein at least one first piece of information can be stored in a first memory area on the transponder that is accessible in clear text only by a read access internal to the transponder, and a second piece of information can be stored in a second memory area that is accessible in clear text through an air interface for read access, and the second piece of information is generated from the first piece of information using an asymmetric encryption method. The invention further relates to an RFID system for wireless data exchange comprising a transponder and a base station, and a method for requesting write and/or read access to a transponder, in particular a passive and/or backscatter-based transponder.
    • 为RFID系统提供了应答器,特别是基于无源和/或反向散射的应答器,其中至少一个第一信息可以存储在应答器上的第一存储器区域中,该第一存储器区域可以以明文方式访问, 读取应答器内部的访问,并且第二条信息可以存储在可通过空中接口以明文方式访问的第二存储器区域中,用于读取访问,并且第二条信息是从第一条信息生成的,使用 一种非对称加密方法。 本发明还涉及用于包括应答器和基站的无线数据交换的RFID系统,以及用于请求对应答器,特别是基于无源和/或反向散射的应答器的写和/或读访问的方法。
    • 6. 发明授权
    • Method and device for recognizing functional states in RFID or remote sensor systems
    • 用于识别RFID或远程传感器系统中的功能状态的方法和装置
    • US08284030B2
    • 2012-10-09
    • US13046591
    • 2011-03-11
    • Ulrich Friedrich
    • Ulrich Friedrich
    • H04Q5/22G08B13/14
    • G06K19/0716G06K7/0008G06K19/07G06K19/0724G06K19/07758
    • A method for recognizing time-variable functional states, e.g., in the course of a programming process, in RFID systems is disclosed, which includes at least one transponder or remote sensor and at least one base station, which transmits data and/or power to the transponder or sensor by a carrier signal. According to the invention, after a specified process state is attained at least one confirmation symbol is transmitted by the transponder or sensor to the base station. As a result, no unfavorable “worst case” scenario has to be provided for chronologically controlling time-variable processes because the base station is able to clearly recognize the beginning and end of the process, as well as the state thereof. RFID systems or remote sensor systems can thus be controlled more quickly and more reliably, resulting especially in reduced costs.
    • 公开了一种在RFID系统中识别时间可变功能状态的方法,例如在编程过程中,其包括至少一个应答器或远程传感器以及至少一个基站,其将数据和/或功率发送到 应答器或传感器通过载波信号。 根据本发明,在达到指定的处理状态之后,应答器或传感器将至少一个确认符号发送到基站。 因此,由于基站能够清楚地识别进程的开始和结束以及其状态,因此不得不按时间顺序控制时变过程来提供不利的最坏情况。 因此RFID系统或远程传感器系统可以被更快速和更可靠地控制,特别是降低成本。
    • 9. 发明授权
    • Method for data communication between a base station and a transponder
    • 基站与应答器之间数据通信的方法
    • US08111672B2
    • 2012-02-07
    • US11105455
    • 2005-04-14
    • Ulrich Friedrich
    • Ulrich Friedrich
    • H04Q7/24
    • G06K7/0008
    • A method for wireless data communication between a base station and at least one transponder by a high-frequency electromagnetic carrier signal, onto which information packets are modulated, wherein each information packet has a header section, a middle section, and a terminating end section, wherein the middle section has a data field, which contains the data necessary for the data communication, wherein at least one additional control field is inserted into the data field by which the structure of the information packets can be variably adjusted within the region of the data field. The invention relates further to a transponder, a base station, and a data communication system.
    • 一种通过高频电磁载波信号在基站与至少一个应答器之间进行无线数据通信的方法,信息分组被调制到其上,其中每个信息分组具有报头部分,中间部分和终止端部分, 其中中间部分具有包含数据通信所必需的数据的数据字段,其中至少一个附加控制字段被插入数据字段中,通过该数据字段可以在数据区域内可变地调整信息包的结构 领域。 本发明进一步涉及应答器,基站和数据通信系统。