Patent application number | Description | Published |
20090006513 | DEVICE AND METHOD FOR GENERATING A RANDOM NUMBER - A method and a device are provided, in particular a transponder, for generating a random number by a linear feedback shift register, wherein a first seed is generated by means of a first automaton, a second seed is generated by means of a second automaton, the first and second automata operate using different functional principles, so that the first and second seeds have different properties, and the shift register is reloaded with the first and/or second seed. | 01-01-2009 |
20090033464 | TRANSPONDER WITH ACCESS PROTECTION AND METHOD FOR ACCESS TO THE TRANSPONDER - A transponder is provided having at least one memory area, whereby the memory area is assigned an access password, the access password is assigned at least one attribute bit, and the length and/or structure of the access password can be set by the attribute bit. The invention relates further to a method for access to at least one access password-protected memory subarea of the transponder and to an RFID system comprising a transponder. | 02-05-2009 |
20110045861 | METHOD FOR COMMUNICATION BETWEEN A BASE STATION AND A PLURALITY OF TRANSPONDERS - A method for communication between a base station and a plurality of transponders, whereby a group with at least two transponders is selected by the base station from among a plurality of transponders and a first transponder is selected from the group of transponders, whereby a session to exchange data is arranged with the first transponder, and whereby the session has a starting time and an ending time, and data are exchanged with the first transponder during the session and a second transponder of the group is selected by the base station during the session with the first transponder and a session is arranged with the second transponder. | 02-24-2011 |
20110148590 | Data Transmission Method and Apparatus in RFID and Remote Sensor Systems - 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. | 06-23-2011 |
20110156876 | Method and Device for Recognizing Functional States in RFID or Remote Sensor Systems - 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. | 06-30-2011 |
20110158176 | Method for Wireless Data Transmission - A method for wireless data transmission between a base station and a transponder is provided, in which data are transmitted between the base station and the transponder in the form of data packets that include a header section with at least one symbol for setting one or more transmission parameters and include at least one additional section. The transponder monitors, during the data transmission, to determine whether a time period between two successive symbol delimiters transmitted by the base station exceeds a maximum time, and if the maximum value is exceeded, a receiver unit of the transponder is reset. The maximum time can be determined in the transponder on the basis of the at least one symbol in the header section. | 06-30-2011 |
20110163851 | Method for Locating a Backscatter-Based Transponder - A method and apparatus for locating a transponder is provided. A carrier signal is transmitted by a base station and a transponder transmits a locating signal that is generated through phase modulation and backscattering of the carrier signal sent by the base station when the transponder is within a transmission range of the base station, whereby the transponder is located on the basis of the locating signal. | 07-07-2011 |
20110163853 | Method for Selecting One or More Transponders - A method and device for selecting one or more transponders, in particular backscatter-based transponders, from a plurality of transponders by a base station, which method is based on a slotted ALOHA method, in which the base station defines numbered time slots and a random number generated in a given transponder determines a time slot when the transponder transmits its transponder-specific identification to the base station. The random number is generated in a given transponder with the aid of a random number generator, the relevant random number generator is switched into a counter operating mode after reception of a selection command transmitted by the base station, while a count state of the random number generator is decremented or incremented when the base station transmits the start of a time slot, the relevant transponder transmits a transponder-specific identification to the base station if the count state of its random number generator is equal to a predetermined value, and the relevant random number generator is then switched back into the operating mode for random number generation. | 07-07-2011 |
20110170487 | Method and Apparatus for Data Communication Between a Base Station and a Transponder - A method and system for data communication between a base station and at least one transponder via a high-frequency electromagnetic carrier signal onto which information packets are modulated. Each information packet has a header section, a middle section, and a trailer section. The header section can be provided in a forward link of a data communication between the base station and the transponders for controlling data communication. The header section is used in a return link of a data communication in order to transmit information from the transponder to the base station. | 07-14-2011 |
20110217924 | Transmitting Data Between a Base Station and a Transponder - In particular embodiments, an error correction during the transmission of the data word is made possible through the change of the modulation state at pre-defined time points. | 09-08-2011 |
20120126952 | Communication Method in RFID or Remote Sensor Systems - A method for communicating between a control unit and a plurality of remote units located in the response area of the control unit is provided. The remote units are prompted to transmit a data sequence to the control unit upon receipt of a command sent by the control unit. The control unit transmits a control signal to the remote units substantially simultaneously with the transmission of the data sequence as a function of a communication state, such as the absence of a transmission of the data sequence by at least one remote unit or an at least partially simultaneous transmission of the data sequence by more than one remote unit. In this way, communication methods can be shortened, in particular in terms of time, without adversely affecting communication reliability. | 05-24-2012 |
20120176229 | Method, Transponder, and System for Secure Data Exchange - A method may include generating by a transponder a first code and transmitting the first code to a base station. The base station may generate first transmission information, encoding a base station code with a first identification and a first random number code, and may transmit the first transmission information to the transponder. The transponder may extract the base station code. A second code may be generated by the transponder and transmitted to the base station upon an associated request from the base station. Before transmission to the base station, the second code may be encoded with the extracted base station code. Second encoded transmission information comprising a second identification may be generated by the base station using the second code and transmitted to the transponder. A memory region of the transponder may be released for read and/or write access after the second identification was verified as valid. | 07-12-2012 |
20120320797 | Method and Apparatus for Data Communication Between a Base Station and a Transponder - In certain embodiments, a transponder comprises a transceiver configured to receive a forward link having a forward-link header comprising at least one symbol for configuring a setting of the transponder. The transponder may be configured to transmit a return link having a return-link header comprising information based on one or more characteristics of the transponder, and to receive a modified subsequent symbol of the forward-link header. The modified subsequent symbol of the forward link header generated by analyzing the return-link header to determine adjusted information for configuring the setting of the transponder and modifying the subsequent symbol of the forward-link header in accordance with the adjusted information for configuring the setting of the transponder. | 12-20-2012 |
20140036902 | Method, Apparatus, and Logic for Wireless Data Transmission - In certain embodiments, a method comprises receiving a data transmission comprising a header with a symbol and at least one symbol delimiter. The method may comprise monitoring the received data transmission to determine whether a time period between successive symbol delimiters of the header exceeds a maximum time. The method may comprise resetting a transponder to an initial state if the time period exceeds the maximum time. The maximum time may be determined based at least in part on the symbol after receiving successive symbol delimiters. | 02-06-2014 |
20140111309 | Method for Selecting One or More Transponders - A method and device for selecting one or more transponders, in particular backscatter-based transponders, from a plurality of transponders by a base station, which method is based on a slotted ALOHA method, in which the base station defines numbered time slots and a random number generated in a given transponder determines a time slot when the transponder transmits its transponder-specific identification to the base station. The random number is generated in a given transponder with the aid of a random number generator, the relevant random number generator is switched into a counter operating mode after reception of a selection command transmitted by the base station, while a count state of the random number generator is decremented or incremented when the base station transmits the start of a time slot, the relevant transponder transmits a transponder-specific identification to the base station if the count state of its random number generator is equal to a predetermined value, and the relevant random number generator is then switched back into the operating mode for random number generation. | 04-24-2014 |
20140132396 | Method For Data Communication Between A Base Station And A Transponder - A method for data communication between a base station and at least one transponder by a high-frequency electromagnetic carrier signal is disclosed, onto which information packets are modulated, whereby each information packet has a header section, a middle section, and an end section and whereby the middle section has a data field for the transmission of data and/or address information and a protection field placed thereafter for the correction of errors in the transmission of the data and/or address information, whereby after the data field the base station inserts at least one control field, by which the protection field following the inserted control field can be changed in such a way that the duration of an information packet is set variably. The invention relates further to a base station for carrying out this method, to a data communication system containing a base station and at least one transponder in communicative wireless contact with the base station. | 05-15-2014 |
20140145830 | Locating a Backscatter-Based Transponder - A method and apparatus for locating a transponder is provided. A carrier signal is transmitted by a base station and a transponder transmits a locating signal that is generated through phase modulation and backscattering of the carrier signal sent by the base station when the transponder is within a transmission range of the base station, whereby the transponder is located on the basis of the locating signal. | 05-29-2014 |