| Entries |
| Document | Title | Date |
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| 20080197980 | Methods and devices for providing scalable RFID networks - According to some implementations of the present invention, RFID devices and middleware servers are automatically provisioned with a network address and with instructions for sending a request for a middleware server to a middleware server assigner. In some implementations, the middleware server assigner is a load balancer. In some implementations, a middleware server is associated with a plurality of RFID devices by associating a middleware server network address or names with the network addresses of the RFID devices. Preferred methods also provide for redundancy of middleware servers and dynamic reassignment of RFID devices from an unavailable middleware server to an available middleware server. | 08-21-2008 |
| 20080258876 | Distributed Antenna Array With Centralized Data Hub For Determining Presence And Location Of RF Tags - A distributed antenna array with a centralized data hub for determining the presence and location of RF tags has been disclosed. This antenna array centralizes electronics and distributes the RF to zones in a facility to greatly reduce the expense of recurring components for monitoring RF tags. A single BRT/hub with multiple antennas attached to transmit and receive ports is used to cover an entire facility. Large facilities are covered by a small number of the BRT/hub combinations. The BRT/hub has transmit antennas coupled thereto, preferably by co-axial cable, that transmit signals to a portion or all of the RF tags and all or a portion of them modulate and reflect the RF signal to a particular receiving antenna. The receiving antenna then returns the RF signal with tag data to the BRT/hub, preferably by co-axial cable. Also disclosed is an RF backscatter tag that cleanly switches a resonant aperture antenna on and off, thereby greatly increasing the mark-to-space ratio of the backscatter data. This enables tags to be detected by the BRT at much greater distances. | 10-23-2008 |
| 20080297321 | Detecting a Self-Jammer Signal in an RFID System - A radio frequency device capable of differentiating self-jammer signals. | 12-04-2008 |
| 20090015381 | WIRELESS TAG READER/WRITER ANTENNA - A wireless tag reader/writer antenna according to an embodiment of this invention includes an antenna unit that incorporates a reader/writer antenna for transmitting and receiving electromagnetic waves to and from wireless tags; and a plurality of magnetic-wave shields that clamp the antenna unit and extend in a direction of radiating electromagnetic waves from the reader/writer antenna. The magnetic-wave shields are configured be provided to be detached or to slide. So configured, the magnetic-wave shields can effectively block electromagnetic waves that are detrimental to communication with the wireless tags. | 01-15-2009 |
| 20090015382 | SYSTEMS AND METHODS FOR COLLISION AVOIDANCE IN A MULTIPLE RFID INTERROGATOR ENVIRONMENT - A method for collision avoidance in a multi-reader environment comprising a plurality of Radio Frequency Identification (RFID) interrogators, the method comprises each of the plurality of interrogators entering a quiet state during which none of the interrogators transmits, each of the plurality of interrogators selecting a transmit time after the quiet period during which each of the interrogator will attempt to transmit, each of the plurality of interrogators monitoring their associated receive path, an interrogator of the plurality of interrogators transmitting an instruction during its selected transmit time indicating the beginning of a session when the interrogator does not detect data on its receive path prior to its select transmit time, the interrogator comparing its receive path to its transmit path when it transmits the instruction, the interrogator returning to the quiet state when the receive path does not match the transmit path, and the interrogator completing the session when the receive path matches the transmit path. | 01-15-2009 |
| 20090021353 | Control Device, RFID Tag Reading System and RFID Tag Reader - It is an object of the present invention to avoid communication congestion and collision by effectively assigning a unit radio channel for transmission and reception to RFID tag readers using the same unit radio channel group. Herein disclosed is an RFID tag reading system for reading an RFID tag using a reader/writer used in a low-output RFID tag reading system capable of using channels | 01-22-2009 |
| 20090027168 | METHODS AND SYSTEMS OF RFID TAGS USING RFID CIRCUITS AND ANTENNAS HAVING UNMATCHED FREQUENCY RANGES - Methods and systems of RFID tags using RFID circuits and antennas having unmatched frequency ranges. At least some of the illustrative embodiments are RFID tags comprising a RFID circuit configured to operate with an antenna having a first range of resonant frequencies, a tag antenna coupled to the RFID circuit (the tag antenna having a range of resonant frequencies different than the first range of resonant frequencies, the range of resonant frequencies of the tag antenna being a second range of resonant frequencies). | 01-29-2009 |
| 20090027169 | TRANSMITTER/RECEIVER FOR RADIO COMMUNICATION, RFID SYSTEM AND RECEIVING METHOD FOR TRANSMITTER/RECEIVER FOR RADIO COMMUNICATION - A transmitter/receiver for radio communication according to an embodiment of the present invention has: a transmission circuit for generating a transmission signal; a demodulation circuit for demodulating a receive signal; an antenna circuit for transmitting the transmission signal from the transmission circuit and receiving the receive signal and guiding the receive signal to the demodulation circuit; a phase shift circuit which is connected between the transmission circuit and the antenna circuit; and a switching circuit which switches between outputting a superimposed signal of the transmission signal and the receive signal between the phase shift circuit and the antenna circuit to the demodulation circuit, and outputting a superimposed signal of the transmission signal and the receive signal between the transmission circuit and the phase shift circuit to the demodulation circuit. | 01-29-2009 |
| 20090045920 | Methods, systems, and products for discovering electronic devices - Methods, systems, and products are disclosed for controlling an electronic device. A query is received at a remote control interface. A response to the query is determined. A random response interval of time is determined according/to a collision avoidance mechanism. When the random response interval of time expires, then the response to the query is sent. | 02-19-2009 |
| 20090045921 | System and method for multi-protocol radio-frequency identification - A system and method for communicating with contactless IC cards of multiple protocols includes transmitting an IC card polling signal and receiving a data transmission from an IC card. A processor is configured to determine whether or not a data transmission is received in response to the polling signal. The processor is configured to decode the data transmission in real-time if it is received in response to the polling signal. The processor is otherwise configured to first store the received data transmission in a memory and then decode the stored data transmission. | 02-19-2009 |
| 20090051496 | Method and Apparatus for Low Power Modulation and Massive Medium Access Control - An ultra low power, low complexity, low collision, deterministic modulation method that also works as a massive medium access mechanism for communication systems is based on positioning data in a communication resource space, such as time and frequency, such that the position of a symbol in that space determines its value and its access to the medium. The number base of the symbol is determined by the size of the subset of the resource space it is positioning itself in and, thereby, a few sparsely located symbols can convey a large value, while the remainder of the space can be simultaneously and massively used by other sparsely resource using members of the network. | 02-26-2009 |
| 20090058612 | METHOD AND APPARATUS FOR AVOIDING COLLISION BETWEEN EACH OF RADIO FREQUENCY IDENTIFICATION READERS - Provided are a method and an apparatus for avoiding a collision between each of radio frequency identification (RFID) readers. The method and the apparatus divide the RFID readers into first RFID readers and second RFID readers according to a maximum output level, and set first frequency channels for the first RFID readers and second frequency channels for the second RFID readers, set frequency channel disposition information for each of the first RFID readers, generate a channel holding signal in each of the first frequency channels, and if a frequency channel usage request or a frequency channel return request is received from one of the first RFID readers, stop generating or generate the channel holding signal in a frequency channel related to the frequency channel usage or return request. In this manner, the collision between each of the RFID readers is avoided by preventing the second RFID readers from using the first frequency channels for the first RFID readers. Also, the method and the apparatus can efficiently manage frequency channels by controlling a ratio of the number of the first frequency channels to be used by the first RFID readers and the number of the second frequency channels to be used by the second RFID readers, according to usage frequency. | 03-05-2009 |
| 20090058613 | METHOD AND APPARATUS FOR COMMUNICATION BETWEEN READERS HAVING DUAL SENSITIVITY MODES - Provided is a method for communication with between readers having dual sensitivity modes for avoiding conflict between readers arising from interference each other when simultaneously used in a limited space. The method for communication between a tag and a reader using dual sensitivity modes for avoiding conflict between the reader and the tag includes: initializing the reader to a normal sensitivity mode; temporarily selecting a frequency channel by the reader; checking whether or not a different reader uses the selected frequency channel; repeatedly selecting another frequency channel if the other readers occupy the selected frequency channel; switching to a reduced sensitivity mode if the other readers do not occupy the selected frequency channel; and communicating with the tag by the reader in the reduced sensitivity mode. | 03-05-2009 |
| 20090066481 | METHOD AND APPARATUS FOR IMPROVING THE EFFICIENCY AND ACCURACY OF RFID SYSTEMS - The present invention relates to a method and apparatus for transmitting a narrow signal beam that allows the precise location of RFID tags to be determined and reduces tag collisions. The present invention further relates to a method and apparatus for combing an RFID reader with an optical source to visualize the interrogation zone of the reader. The present invention also relates to a method and apparatus for improving the efficiency of RFID systems. | 03-12-2009 |
| 20090091428 | Method and System to Determine Physical Parameters as Between an RFID Tag and a Reader - A method and system to determine physical parameters as between an RFID tag and a reader. At least some of the illustrative embodiments are methods comprising generating an antenna feed signal, and transmitting a first electromagnetic wave to a radio frequency device (by coupling the antenna feed signal to a reading antenna), receiving a backscattered electromagnetic wave from the radio frequency device to create a received signal, calculating a combined signal based on the antenna feed signal and received signal, and determining relative velocity between the radio frequency device and the reading antenna based on the combined signal. | 04-09-2009 |
| 20090096585 | Methods, Systems and Apparatus for Radio Frequency Identification (RFID) System Configuration Management - Methods, systems and apparatus for controlling initiation of configuration of RFID readers using initiate-staging control information, include interrogating a reading zone of a reader for initiate-staging control information, and selectively setting the reader in an initiate-staging state in accordance with initiate-staging control information detected by the interrogation. The interrogation may include interrogating at least one RFID tag located in the reading zone of the reader for initiate-staging control information stored therein. The interrogation may include interrogating a reading zone of the reader for initiate-staging control information only during a predetermined period of time T | 04-16-2009 |
| 20090102610 | RFID ANTENNA SELECTION SYSTEM AND METHOD - A method and apparatus for reading a plurality of RFID tags using a plurality of antennas includes ranking a plurality of antennas based on RFID tags readable, wherein the antenna that can read most RFID tags receives a highest ranking, and the antenna that can read the most RFID tags that were not read by another, higher ranked antenna receives the next highest ranking, progressively until each of the antennas are ranked. During a read operation, the antennas are used in series to read the RFID tags, commencing with using the highest ranking antenna and subsequently using the antennas with progressively lower ranking to read the RFID tags. | 04-23-2009 |
| 20090115582 | APPARATUS FOR RECOGNIZING RADIO FREQUENCY IDENTIFICATION (RFID) AND METHOD THEREOF, AND DATA PROCESSING METHOD OF RFID - The present invention relates to an RFID reader and a method thereof, and an RFID data processing method. The RFID reader generates a specific query message to a plurality of RFIDs, receives a first response message corresponding to the query message from at least one RFID among the RFIDs, and sequentially identifies a tag ID of a collided RFID by using a collision solving message when a collision occurs according to the result of receiving a first response message. The RFID reader can quickly and accurately identify a plurality of RFIDs since it can eliminate an unnecessary time such as excessive no response slot generation or repeated rounds through a sequential identification process for the collided RFIDs. | 05-07-2009 |
| 20090134975 | TAG ESTIMATION METHOD AND TAG IDENTIFICATION METHOD FOR RFID SYSTEM - Provided are a tag estimation method and a tag identification method using the same in a RFID system. In the tag estimating method, a reader divides tags in an identifiable area into a predetermined number of groups. Tags are identified by applying a pilot frame L | 05-28-2009 |
| 20090146791 | Method, device, and system for "listen-before-talk" measurement to enable identifying of one or more unoccupied RF sub-bands - The invention relates to a method of performing a Listen-Before-Talk measurement to enable identifying of one or more unoccupied radio frequency sub-bands applicable for radio frequency identification (RFID) communication operable with a radio frequency identification (RFID) reader subsystem; said method including obtaining timing information relating to one or more periods of activity of a wireless communication subsystem; deriving information about one or more periods of non-activity from said timing information; configuring said wireless communication subsystem to perform said Listen-Before-Talk measurement in coordination with said one or more periods of non-activity; and performing said Listen-Before-Talk measurement by the means of the wireless communication subsystem to identify said one or more unoccupied radio frequency sub-bands. | 06-11-2009 |
| 20090201135 | WIRELESS IC COMMUNICATION DEVICE AND RESPONSE METHOD FOR THE SAME - The present invention aims to provide a wireless IC communication device that can prevent information from being read out without permission of an owner of items to each of which the wireless IC communication device is attached. The wireless IC communication device includes: a slot number obtainment unit ( | 08-13-2009 |
| 20090219141 | PHASE HOPPING TO REDUCE INTERFERENCE AND IMPROVE RADIO FREQUENCY IDENTIFICATION (RFID) TAG THROUGHPUT - A radio frequency identification (RFID) reader outputs an interrogation signal, and hops/varies the phase of the interrogation signal sent by the RFID reader over time. Varying the phase of the interrogation signal enables the RFID reader to provide, for each zone of an RF field of the RFID reader, a particular phase that reduces of the effects of interference RF signal(s) present in that zone of the RF field. Reducing the interference in each zone of the RF field increases the throughput of RFID tags that can be successfully read by the RFID reader. | 09-03-2009 |
| 20090231106 | Tag Apparatus,Transceiver Apparatus, and Tag System - A tag apparatus ( | 09-17-2009 |
| 20090243809 | Reading device, computer program product and reading system - The reader/writer repeatedly reads data, which is stored in an IC tag existing in an area where communication with the reader/writer can be established, from the IC tag in a noncontact method. The reader/writer transmits the read data to the administrative device. The administrative device generates read data which shows the result of reading in chronologic order and generates feature data indicative of the feature of the result of reading on the basis of the generated time series data. An IC tag is sorted as a target tag or an unnecessary tag by sorting the read data as necessary data or unnecessary data on the basis of the generated feature data. | 10-01-2009 |
| 20090289770 | METHOD AND SYSTEM TO NEGATE INTERFERENCE FROM ADJACENT TRANSMITTERS IN AN ELECTRONIC ARTICLE SURVEILLANCE SYSTEM - A method and electronic article surveillance (“EAS”) system reduce interference. The EAS system includes a detection zone. At least one reference pattern of transmission windows for an interfering EAS system is provided. The reference pattern indicates a sequence of time slots for which the interfering EAS system is transmitting. A sample pattern of signals is received. Each signal has a corresponding amplitude. The received sample pattern is compared to the at least one reference pattern. Responsive to determining that the received sample pattern matches the at least one reference pattern, the at least one reference pattern is used to trim samples received during receive windows corresponding to the time slots for which the interfering EAS system is transmitting. | 11-26-2009 |
| 20090303014 | Coherent multichip rfid tag and method and apparatus for creating such coherence - An RFID tag ( | 12-10-2009 |
| 20090303015 | INFORMATION PROCESSING APPARATUS, INFORMATION PROCESSING METHOD, PROGRAM, AND INFORMATION PROCESSING SYSTEM - An information processing apparatus includes: processing sections that have respective identification information and that perform processing corresponding to a request from another information processing apparatus; and a reporting section that stores the respective identification information of the processing sections and, instead of the processing sections, that reports the identification information to the another information processing apparatus in response to a request for reporting the identification information, the request being issued from the another information processing apparatus. | 12-10-2009 |
| 20100001843 | APPARATUS AND METHOD FOR INTEGRATED READER AND TAG - Provided are a reader-tag integrated RFID apparatus and a method for controlling the same. The apparatus includes a tag unit for communicating with an external reader, and transmitting a response signal and data corresponding to a signal transmitted from the external reader to the external reader, a reader unit for selecting a channel between other reader and the reader-tag integrated RFID apparatus with a different delay time, and communicating with an external tag using a random value to minimize collision; and a controller for selectively activating one of the tag unit and the reader unit if it necessary. | 01-07-2010 |
| 20100019887 | Multiple Radio Frequency Identification (RFID) Tag Wireless Wide Area Network (WWAN) Protocol - In certain embodiments, an RFID tag comprises a memory module and one or more processing units. The memory module stores a subscriber identification number shared by the tag and one or more other tags for accessing a WWAN. Each tag is operable to access the WWAN using the subscriber identification number at a corresponding unique timeslot, the corresponding unique timeslot for a tag being distinct from the timeslots at which the other tags can access the WWAN using the subscriber identification number. The one or more processing units access the WWAN using the subscriber identification number to initiate a tag session at the corresponding unique timeslot for the tag. The corresponding unique timeslot for the tag is distinct from timeslots at which the other tags may access the WWAN using the subscriber identification number. The one or more processing units are operable to communicate tag information during the tag session at the corresponding unique timeslot for the tag. | 01-28-2010 |
| 20100039236 | TIME-BASED OPERATIONAL WINDOW FOR RFID TAGS - The present invention provides a time-based operational window for RFID tags. A method in accordance with an embodiment includes: associating an operational window with the RFID tag; determining if a current time is within the operational window; operating the RFID tag if the current time is within the operational window; and not operating the RFID tag if the current time is outside the operational window. | 02-18-2010 |
| 20100052862 | METHOD FOR PREVENTING SIGNAL COLLISION IN RADIO FREQUENCY IDENTIFICATION SYSTEM AND RADIO FREQUENCY IDENTIFICATION TAG USED THEREOF - A method for preventing signal collision in radio frequency identification (RFID) system through random code timing is disclosed. The RFID system includes one or more RFID reading device to receive respective tag information from a plurality of RFID tags. Multiple RFID tags of the RFID system each includes a microprocessor connected to a random code generation unit, a power supply unit, a memory unit and a radio frequency transceiver module. The memory unit stores the respective tag information that contains a tag identification code. The microprocessor of the RFID tag issues a base number or uses the tag identification code to generate a random code and a tag signal is transmitted to the RFID reading device in accordance with the random code so generated. | 03-04-2010 |
| 20100090804 | CONTACTLESS TRANSMISSION ELEMENT AND METHOD OF CHARACTERIZING THE SAME - A method of characterizing a contactless transmission element ( | 04-15-2010 |
| 20100090805 | ELECTRONIC DEVICE AND MANAGEMENT OF COMPETING CONTACTLESS COMMUNICATION OF SUCH A DEVICE AND A HOST EQUIPMENT - An electronic device provided with RFID or NFC type short range contactless communication element, and a method of managing such element. The electronic device includes in particular a processing unit and first contactless communication element enabling the processing unit to communicate with a first external equipment, and includes in particular:
| 04-15-2010 |
| 20100102933 | RADIO FREQUENCY IDENTIFICATION SYSTEM USING MULTIPLE BAND TRANSMISSION - A radio frequency identification (RFID) system employs multiple band transmission to prevent signal collision. The system includes a plurality of RFID tag groups and at least one RFID reader. Each RFID tag group includes at least one RFID tag. The RFID tags of the same RFID tag group are operated for radio frequency transmission in the same transmission frequency band, and those of different RFID tag groups are operated for radio frequency transmission in different transmission frequency bands. When the RFID reader simultaneously receives radio frequency signals issued from RFID tags of different RFID tag groups, since they are transmitted in different transmission frequency bands, signal collision among the RFID tags of the RFID tag groups can be avoided. | 04-29-2010 |
| 20100109847 | Collision resolution protocol for mobile RFID tag identifiaction - The performance of a radio frequency identification (RFID) system is improved by a protocol that eliminates collisions between signals generated by a) RFID tags that the RFID reader has already identified as being in its interrogation zone and b) RFID tags that are newly arrived and thus that the reader has not yet identified. This is illustratively accomplished by the use of separate identification and access frames. It is during the identification frame that newly arrived tags become identified by the reader. Although there may be collisions during the identification frame, those collisions are only among newly arrived tags. The already-identified tags communicate with the reader during respective time slots of the access frame, so that they neither collide with each other nor with the newly arrived tags. | 05-06-2010 |
| 20100109848 | METHOD AND APPARATUS TO DETECT TRANSPONDER TAGGED OBJECTS, FOR EXAMPLE DURING MEDICAL PROCEDURES - The presence or absence of objects (e.g., medical implements, medical supplies) tagged with transponders may be determined in an environment in which medical procedures (e.g., surgery) are performed via an interrogation and detection system which includes a controller and a plurality of antennas positioned along a patient support structure. The antennas may, for example, be positioned along an operating table, bed, a mattress or pad or a sheet and may be radiolucent. Respective antennas may successively be activated to transmit interrogation signals. Multiple antennas may be monitored for responses from transponders to the interrogation signals. For example, all antennas other than the antenna that transmitted the most recent interrogation signal may be monitored. | 05-06-2010 |
| 20100117804 | Surface Acoustic Wave Coding for Orthogonal Frequency Coded Devices - Methods and systems for coding SAW OFC devices to mitigate code collisions in a wireless multi-tag system. Each device producing plural stepped frequencies as an OFC signal with a chip offset delay to increase code diversity. A method for assigning a different OCF to each device includes using a matrix based on the number of OFCs needed and the number chips per code, populating each matrix cell with OFC chip, and assigning the codes from the matrix to the devices. The asynchronous passive multi-tag system includes plural surface acoustic wave devices each producing a different OFC signal having the same number of chips and including a chip offset time delay, an algorithm for assigning OFCs to each device, and a transceiver to transmit an interrogation signal and receive OFC signals in response with minimal code collisions during transmission. | 05-13-2010 |
| 20100141392 | METHOD FOR PREVENTING READER COLLISION, METHOD FOR DRIVING AN RFID READER USING THE METHOD AND RFID READER FOR PERFORMING THE METHOD - A method for preventing reader collision, includes detecting the number of readable readers within a readable region of a target reader, calculating the number of peripheral readers within the readable region and a collision region of the target reader by using the number of the readable readers, forming one frame with time slots of which the number equals to the number of the peripheral readers, and setting a present time slot of the target reader to be one of the time slots, the one being selected randomly in the time slots. Therefore, a multiple-readers-to-tag interference which happens when more than one RFID reader tries to access to one tag and a reader-to-reader interference are prevented. | 06-10-2010 |
| 20100148931 | RADIO DEVICES AND COMMUNICATIONS - Each of multiple radio devices in a region (e.g., a zone) receives time reference information for synchronizing themselves amongst each other. For example, based on the timing reference information, each radio device in a region synchronizes itself with respect to a common time reference, enabling communications according to shared access schedule (e.g., a time slotted access schedule). Each of the radio devices schedules communications to one or more target devices (e.g., RFID tags) in a monitored region based at least in part according to the shared access schedule. For example, each of multiple transmitters of the tag readers are assigned one or more time slots of the shared access schedule in which they are permitted to communicate in the monitored region. | 06-17-2010 |
| 20100148932 | WIRELESS ELECTRONIC ARTICLE SURVEILLANCE SYNCHRONIZATION SYSTEM AND METHOD WITH DATA TRANSFER - A method and system are provided for synchronizing a plurality of electronic article surveillance (“EAS”) units and providing wireless data transfer by the EAS units. The invention generates a master synchronization signal, transmits the master synchronization signal to the plurality of EAS units and applies the master synchronization signal to trigger a synchronization packet reception period. A beginning of a wireless data transfer period is calculated and initiated based on the triggering of the synchronization packet reception period. | 06-17-2010 |
| 20100164690 | ARRAY OF VERY LIGHT READERS FOR ACTIVE RFID AND LOCATION APPLICATIONS - The Very Light Readers of the present invention are based on an augmented Tag circuit with a preferred embodiment including at least one VLSI chip integrating a UWB front end, digital transceiver, and possibly an internal controller; a UWB Antenna; a power supply; a controller configured to implement the Media Access Control protocol of the system; a Communication Interface subsystem for connection to the system network and a clock source. Also described is a system capable of reducing collision occurrence in a network for communicating between multiple readers and a plurality of RF Tags. Tags are configured to receive interrogation signals and transmit response signals. Readers are configured to transmit interrogation signals, receive response signals, estimate the quantity of responses received to an interrogation, determine the round trip delay time of each response and estimates whether a collision between responses has occurred. If so, the Reader transmits an additional interrogation signal. The Reader also transmits an acknowledgment packet to responding Tags so responding Tag will not answer again to that broadcast session. Other Readers in the network also receive the acknowledge packet and do not try again to reach the responding Tags, thereby lowering congestion directed toward Tags from multiple Reader transmissions. | 07-01-2010 |
| 20100171594 | RFID READER DISCIPLINE - A method for coordinating reader transmissions according to one embodiment includes, at a first reader, receiving from a second reader a request to transmit to a radio frequency identification tag; and if the first reader is transmitting, sending a denial of the request from the first reader to the second reader. A method for coordinating reader transmissions according to another embodiment includes from a first reader, sending to a plurality of readers a request to transmit to a radio frequency identification tag; waiting for responses from the plurality of readers; if a denial of the request is received by the first reader from any of the readers, not transmitting to the radio frequency identification tag; and if no denial of the request is received by the first reader from any of the readers, transmitting to the radio frequency identification tag. Additional systems, methods and computer program products are presented. | 07-08-2010 |
| 20100171595 | RFID TAG COMMUNICATING APPARATUS AND RFID TAG COMMUNICATION SYSTEM - A radio frequency identification (RFID) tag communicating apparatus that executes communication of information with an RFID tag by transmitting a transmission signal toward the RFID tag and receiving a return signal returned from the RFID tag in response to the transmission signal, includes a communication control portion that selectively establishes a first communication mode of executing communication of information with all RFID tags included in a list that defines a plurality of the RFID tags that are predetermined handling the RFID tags to be communicated or a second communication mode of executing communication of information with at least one of the RFID tags corresponding to a designated piece of identification information handling the RFID tag to be communicated; and a switching determining portion that determines switching between the first communication mode and the second communication mode based on a predetermined parameter and a switching condition determined in advance. | 07-08-2010 |
| 20100176926 | TIME SLOT ALLOCATION APPARATUS AND METHOD FOR PREVENTING COLLISIONS BETWEEN TIME SLOTS IN TDMA-BASED RFID NETWORK - The present invention relates to a time slot allocation apparatus and method for preventing collisions between time slots in a TDMA-based RFID network. The time slot allocation apparatus allocates time slots, obtained by dividing a same frequency band into unit time slots, to RFID readers for reading identification codes of RFID tags ( | 07-15-2010 |
| 20100182128 | TAG IDENTIFICATION METHOD, TAG ANTICOLLISION METHOD, RFID TAG - Provided is a tag identification method in an RFID system. A tag identification method generates a query tree according to a query and a response between an RFID reader and a tag to identify the tag. In the method, a query message is transmitted from the RFID reader to the tag. A response message for the query message is received from the tag. Herein, the query tree is generated in the reverse order of a string owned by the tag. The query tree is generated in the reverse order of the tag IDs in the query tree-based protocol to reduce the frequency of collisions between the tags, thereby making it possible to reduce the time taken to identify all the tags within the recognizable range of the RFID reader. | 07-22-2010 |
| 20100182129 | INTERFERENCE REJECTION IN RFID TAGS - RFID tags, tag circuits, and methods are provided that reject at least in part the distortion caused to wireless signals by interference in the environment. When the received RF wave is converted into an unfiltered input ( | 07-22-2010 |
| 20100201494 | SYSTEM AND METHOD FOR ALLOWING MULTIPLE RFID READER DEVICES TO READ RFID TAGS WITHOUT COLLISION - Provided are an RFID operating system and an RFID system operating method for allowing multiple RFID readers to read tags without collision. The RFID system operating method includes the steps of grouping RFID readers spaced apart by more than a spacing distance capable of avoiding collision between RFID readers into a single group to determine at least one group, classifying RPM readers included in each group into at least one sub-group based on a read time of each RFID reader, and driving the RFID readers such that RPM readers belonging to at least two different sub-groups that do not collide with each other simultaneously operate. According to the present invention, switching is performed sub-group by sub-group to reduce the number of switching operations and sub-groups can simultaneously operate to decrease a read time. | 08-12-2010 |
| 20100207736 | MOBILE RFID READER AND RFID COMMUNICATION METHOD USING SHARED SYSTEM CLOCK - The present invention relates to a mobile radio frequency identification (RFID) reader and a RFID communication method using a shared system clock. According to the present invention, clock for synchronizing the mobile RFID readers can be shared without changing hardware of a conventional RHD device. Also, since the shared clock is used, a technology for preventing a collision with the readers can be easily realized in a mobile multi-reader environment. | 08-19-2010 |
| 20100207737 | TDMA CONTROL METHOD USED BY RFID READER VIA MOBILE PHONE BASE STATION AND MOBILE RFID READER - A time division multiple access (TDMA) control method used by a mobile radio frequency identifier (RFID) reader through a mobile phone base station and a mobile RFID reader are provided. Each mobile RFID reader occupies a frequency channel during a time slot allocated through a mobile communication base station, thereby avoiding interference between readers. | 08-19-2010 |
| 20100214072 | RFID MIDDLEWARE SYSTEM AND METHOD OF SUPPORTING REAL-TIME BALANCING OF LOADS OF READER CONNECTIONS - Disclosed is radio frequency identification (RFID) middleware system and method of detecting the load of reader connections occurs during the middleware is running and balancing the load in real-time so as to minimize a decrease of the performance of the RFID middleware system. The RFID middleware system comprises: a client; a RFID middleware; RFID readers; and RFID tags, wherein the RFID middleware comprises: a middleware engine which filters tag events collected according to queries registered in the client; and a reader framework which detects the load of the connections of the RFID readers occurs while the RFID middleware is running and balances the load in real-time. | 08-26-2010 |
| 20100214073 | TAG COMMUNICATION DEVICE AND TAG COMMUNICATION METHOD - To improve communication between tags by causing a mobile object having a RFID tag attached to transmit an interrogating wave only when moving in a communication range to reduce power consumption and prevent occurrence of tag confusion. By acquiring two Doppler signals from 2-frequency transmission waves (CW) with different frequencies and respective reflected waves and detecting phase difference from the Doppler signals, a cargo ( | 08-26-2010 |
| 20100259366 | METHOD FOR PREVENTING COLLISION OF RFID TAGS IN AN RFID SYSTEM - The method includes: a reader begins to count the tags, and waits for feedback of the tags; the tags are split into two subsets if the tags feedback the collision, the tags of one of the subsets feedback, the tags of the other subset begin to feedback when the tags of one of the subsets complete the count; when the collision occurs in the course of feedback, then the split continues until all the tags are completed the count; the tags of many branches are at least once split simultaneously when the tags of the subsets are split. | 10-14-2010 |
| 20100271185 | BINARY TREE METHOD FOR MULTI-TAG ANTI-COLLISION - A binary tree method for avoiding collision of multiple tags, comprising: during inventorying tags, a reader sending a re-splitting instruction to the tags and entering a next time slot for reception if the reader does not receive any reply information from the tags in a specified time slot and one of the following conditions is satisfied: the reader received incorrect reply information from the tags in the former time slot, or a re-splitting instruction was sent in the former time slot; and when the tags receive the re-splitting instruction, for tags whose counter values are not 1, the counter values remaining unchanged, and tags whose counter values are 1 splitting into two subsets 0 and 1, and those counter-0 tags replying to the reader. With the present invention, the inventorying flow of Binary Tree is optimized, the inventorying efficiency is improved, and the whole flow becomes more reasonable. | 10-28-2010 |
| 20110006884 | RFID INTERROGATOR CALCULATING ADAPTIVE RETRANSMISISON WAIT TIME AND CONTROL METHOD THEREOF - As an RFID interrogator calculating an adaptive retransmission wait time and a control method thereof, the RFID interrogator includes a collision diagnosis unit that analyzes data on a received signal received during a receive time in correspondence with a transmitted signal from an RF communication unit that can transmit and receive signal to and from one or more tag, verifies whether or not a collision occurs in the received signal, and diagnoses a collision type depending on an analysis result of the data on the received signal; a situational command retransmission portion that determines whether or not the command is retransmitted on the basis of the occurrence of the collision and the collision type received from the collision diagnosis unit; and a random wait time calculation portion that calculates a random wait time for retransmitting the command. | 01-13-2011 |
| 20110018691 | RFID INTERROGATOR HAVING COLLISION TYPE IDENTIFICATION FUNCTION AND CONTROL METHOD THEREOF - Disclosed is an RFID interrogator having a collision type identification function and a control method thereof. It verifies whether or not a collision occurs in a received signal by analyzing data of a signal received from an RF communication unit and performs a corresponding collision resolution operation by diagnosing a collision type in accordance with a collision generation means between the corresponding RFID interrogator and other interrogators or a tag. Since all types of collisions that occur between the RFID interrogator and the tag can be identified, a reason for occurrence of the collisions can be rapidly recognized to cope with the reason for the collisions. | 01-27-2011 |
| 20110025470 | AUTOMATIC MODE DETECTION IN A DUAL MODE RFID TAG - When multiple readers for RF transponders have to be placed in close proximity, such as in adjacent lanes of a highway toll barrier, they can be set to operate at different frequencies. When signals from two adjacent ones of the readers interfere, the resulting signal includes interference terms whose frequencies equal the sum of the reader frequencies and the difference between the reader frequencies. To remove such interference terms while passing the desired terms, a tag includes a low-pass or other frequency-selective filter. | 02-03-2011 |
| 20110032080 | METHOD FOR REDUCING A NOISE IN A SIGNAL RECEIVED IN A CONTACTLESS-CARD INTERROGATOR AND A CIRCUIT TO PERFORM SAID METHOD - A calibrating output signal of the transmitter is generated in an interrogator in that a first output signal of a local oscillator is shallowly amplitude-modulated with a pilot signal having a frequency at which a contactless-card encodes data. A receiver reference signal is generated by combining the calibrating output signal of the transmitter and a signal whose carrier signal has a frequency equaling the frequency of the local oscillator signals, conducting the combined signal through a band-pass filter and amplifying it. A first and a second receiver output signals are cleared by subtracting the receiver reference signal, which has been attenuated by a calibrated factor and has a calibrated polarity, from the first and the second receiver output signal, respectively. The attenuation factor and the polarity of the receiver reference signal are sporadically calibrated for each of both receiver output signals by determining and setting the attenuation factor and the polarity of the receiver reference signal as a pair of values for each of both receiver output signals, at which pair of values the first and the second cleared receiver output signals have the lowest amplitude. The signal-to-noise ratio for the interrogator receiver output signal is improved, because this signal no longer contains an amplitude noise of the interrogator transmitter. | 02-10-2011 |
| 20110063085 | METHOD FOR DETERMINING OPTIMAL FRAME SIZE FOR TAG COLLISION PREVENTION IN RFID SYSTEM - The present invention relates to a method for determining an optimal frame size for tag collision prevention in an Aloha-based RFID system in which frame sizes limited to a certain unit are used to identify tags, the method including the steps of using an RFID for: (a) calculating an estimated optimal frame value for the RFID reader identifying the tags; (b) calculating expected time delays per tag of a left-hand frame size and a right-hand frame size, which show the smallest differences with respect to the estimated optimal frame value, among the frame sizes; (c) comparing, the expected time delay per tag of the left-hand frame size with that of the right-hand frame size; and (d) determining a frame size which has a smaller expected time delay per tag, between the left-hand frame size and the right-hand frame size, to be an optimal frame size. | 03-17-2011 |
| 20110063086 | RF TAG READER AND WRITER - There is provided an RF tag reader and writer including: a transmission antenna configured to transmit a desired signal; a receiving antenna configured to receive radio waves transmitted from an RF tag which is a communication target; a return-loss determination unit configured to determine the receiving intensity of the receiving antenna with respect to reflected waves of radio waves radiated from the transmission antenna; and a reading control unit configured to start a reading operation of the RF tag by being triggered by a return loss value determined by the return-loss determination unit. | 03-17-2011 |
| 20110115611 | ENCODING MODULE, ASSOCIATED ENCODING ELEMENT, CONNECTOR, PRINTER-ENCODER AND ACCESS CONTROL SYSTEM - An encoding module and related systems and components are provided. The encoding module includes a plurality of encoding elements arranged in an array of columns and rows and one or more switching elements configured to selectively connect the encoding elements to a reader. The connection of the encoding elements may be based on the location of a targeted transponder disposed among multiple adjacent transponders to ensure the selective communication with the targeted transponder only. The module is configured for various types and locations transponders to be used within a system, such as a printer-encoder. Each encoding element may include a loaded conductive strip comprising a loop shape portion and a shield that corresponds to the loop shape portion. In another embodiment, an access control system having an encoding module with the plurality of couplers and an access card having a plurality of transponders corresponding to the couplers is provided. | 05-19-2011 |
| 20110121949 | Neighbor discovery techniques - A system including a number of wireless communication nodes spaced apart from one another. The nodes are structured to transmit and receive unique signatures. A neighborhood of nodes may be discovered based on the unique signatures. | 05-26-2011 |
| 20110133901 | METHOD AND DEVICE FOR READING RADIO FREQUENCY IDENTIFICATION (RFID) TAGS - A method and device enables reading radio frequency identification (RFID) tags in a localized area. The method according to one embodiment includes commencing transmission of an interference signal from a reader device (step | 06-09-2011 |
| 20110148591 | METHODS AND APPARATUS FOR OPERATING A RADIO DEVICE - A radio device such as a wireless tag reader communicates with multiple types of wireless identification tags in a monitored region. The radio device includes a network interface to receive messages transmitted over a network. In response to receiving a message indicating to reconfigure the radio device to support an additional wireless tag protocol, the radio is reconfigured to support communications with a corresponding new type of wireless identification tag in a monitored region. Based on this technique of reconfiguring the radio device via network messages, the radio device optionally supports additional, new or latest versions of wireless tag protocols without having to physically reprogram or replace the radio device. | 06-23-2011 |
| 20110181397 | BACKSCATTERING TYPE RFID COMMUNICATION SYSTEM - A backscattering type radio frequency identification (RFID) communication system, and more particularly, a backscattering type RFID communication system in which an RFID tag transmits a signal back to an RF reader by using energy of a carrier wave transmitted by the RFID reader. Provided is a backscattering type radio frequency identification (RFID) communication system RFID communications are performed efficiently without an error while interference between RFID readers does not occur even under an overcrowded reader environment. Interference of RF signals between the RFID readers does not occur, and RFID communications can be efficiently performed even under the overcrowded reader environment. Transmitting and receiving time steps of the RFID readers do not need to be synchronized with one another so that compatibility of the RFID readers can be improved. | 07-28-2011 |
| 20110193685 | RFID COMMUNICATION SYSTEMS AND METHODS, AND RFID READERS AND SYSTEMS - A method of coordinating a plurality of RFID readers includes controlling the RFID readers such that only one of the readers performs an inventory of RFID tags at a time. A system for coordinating a plurality of RFID readers is also provided. | 08-11-2011 |
| 20110210828 | Method for Card-Reading Anti-Collision with Automatic Frequency Hopping - A method for card-reading anti-collision with automatic frequency hopping is provided, which is used for a system in which a card reader simultaneously reads a plurality of cards in radio frequency identification technologies. The method comprises: both the card reader and the cards to be read are configured to have an automatic frequency-sweep function and a function of hopping from a current channel to another channel, and to store access addresses and transaction addresses; when the card reader is in a frequency-hopping card-seeking state, it is in an n-channel frequency-hopping working state, in which, the access address of each channel is the same, and the card reader reads the cards by means of hopping frequencies in a sequence iteratively through n channels. When the card reader detects that two or more cards collide, the card reader sends a command of random frequency hopping, making all the conflicting cards to hop to other channels randomly and to wait to access those channels. The beneficial effects of said method includes: it can quickly realize a card-reading anti-collision mechanism and improve the card-reading speed. | 09-01-2011 |
| 20110234380 | DATA COLLECTION SYSTEM AND WIRELESS TAG - A data collection system includes: a plurality of wireless tags; and a data collection device that performs time-division multiplexing communication with the plurality of wireless tags, the wireless tag including a tag-side transmission unit that transmits a signal in a frequency band higher than the LF band to the data collection device, a tag-side reception unit that receives an LF signal transmitted from the data collection device, a timer that performs time measurement, and a storage that stores information. | 09-29-2011 |
| 20110260838 | SYSTEMS AND METHODS FOR RFID TAG ARBITRATION WHERE RFID TAGS GENERATE MULTIPLE RANDOM NUMBERS FOR DIFFERENT ARBITRATION SESSIONS - A radio frequency identification device (RFID) tag includes a processor, a memory configured to store an identification number that distinguishes the tag from other tags, and a transponder coupled to the memory and the processor. The tag arbitrates by selecting a random number in response to an inventory query from a reader. The tag responds to the reader depending on the random number selected. The tag is configured for multiple concurrent inventory session arbitrations with multiple readers by separately storing random numbers for respective inventory session arbitrations. | 10-27-2011 |
| 20120025955 | EVENT PROCESSING APPARATUS AND METHODS - Event processing apparatus for processing electronic tag reading events comprising a first event processing module and one or more second event processing modules. The or each second event processing module is operable to receive event data records concerning electronic tag reading events from electronic tag readers, and to transmit to the first event processing module processed event data records concerning selected electronic tag reading events. A filter control module transmits filter definitions to the second event processing modules and subsequently transmits filter control signals indicating that filters should be activated or deactivated in order to avoid overloading of the first event processing module. Statistics concerning the selectivity of filters, including filters which are currently inactive, are used to determine which filters should be activated or deactivated. | 02-02-2012 |
| 20120032787 | MULTI-PROTOCOL RFID SYSTEM USING DYNAMIC RECONFIGURATION - A multi-protocol RFID interrogating system employs a synchronization technique (step-lock) for a backscatter RFID system that allows simultaneous operation of closely spaced interrogators. The multi-protocol RFID interrogating system can communicate with backscatter transponders having different output protocols and with active transponders including: Title 21 compliant RFID backscatter transponders; IT2000 RFID backscatter transponders that provide an extended mode capability beyond Title 21; EGO™ RFID backscatter transponders, SEGO™ RFID backscatter transponders; ATA, ISO, ANSI AAR compliant RFID backscatter transponders; and IAG compliant active technology transponders. The system implements a step-lock operation, whereby adjacent interrogators are synchronized to ensure that all downlinks operate within the same time frame and all uplinks operate within the same time frame, to eliminate downlink on uplink interference. | 02-09-2012 |
| 20120032788 | MULTI-PROTOCOL RFID SYSTEM USING BIT-LOCK OR STEP-LOCK SYNCHRONIZATION - A multi-protocol RFID interrogating system employs a synchronization technique (step-lock) for a backscatter RFID system that allows simultaneous operation of closely spaced interrogators. The multi-protocol RFID interrogating system can communicate with backscatter transponders having different output protocols and with active transponders including: Title 21 compliant RFID backscatter transponders; IT2000 RFID backscatter transponders that provide an extended mode capability beyond Title 21; EGO™ RFID backscatter transponders, SEGO™ RFID backscatter transponders; ATA, ISO, ANSI AAR compliant RFID backscatter transponders; and IAG compliant active technology transponders. The system implements a step-lock operation, whereby adjacent interrogators are synchronized to ensure that all downlinks operate within the same time frame and all uplinks operate within the same time frame, to eliminate downlink on uplink interference. | 02-09-2012 |
| 20120068829 | Anti-collision method and system for reading data from multiple RFID tags - A radio frequency identification (RFID) system for reading data from multiple RFID tags without radio frequency (RF) signal collision. The system includes a RF caller ( | 03-22-2012 |
| 20120068830 | Physical Layer Management Using RFID Modules and Common Mode Signaling - An intelligent network patch field management system is provided that includes active electronic hardware, firmware, mechanical assemblies, cables, and software that guide, monitor, and report on the process of connecting and disconnecting patch cords plugs in an interconnect or cross-connect patching environment. RFID tag integrated chips are used in some embodiments of the system to allow for detection of patch cord insertion and removal at switch ports. RFID tags may also be used to detect users and control access to the network based on the users' levels of authorization. Network access can also be controlled at the outlet jack level. The system is capable of monitoring patch cord connections to detect insertions or removals of patch cords or plugs. In addition, the system can map entire networks. | 03-22-2012 |
| 20120075075 | LABEL ANTI-COLLISION METHOD AND SYSTEM - A label anti-collision method is disclosed, which is applied in a radio frequency identification system including a reader and labels. When the labels enter into an arbitration process, the reader sends the predetermined number of labels to the labels; the reader sends start counting instruction; after a label receives the start counting instruction, the label initializes its own information, and according to the predetermined number of the labels, selects a random number as an initial value of a counter and enters into the arbitration process. A label anti-collision system is also disclosed. With the method and the system, all the labels are hashed at the beginning of arbitrating with the Binary Tree method so as to reduce the probability of the collisions and improve the arbitration efficiency. | 03-29-2012 |
| 20120092136 | Radio frequency identification system and tag counting ending method for anti-collision thereof - The present invention provides a radio frequency identification (RFID) system and a tag counting ending method for anti-collision thereof. The RFID system comprises a reader-writer and tags. The tag counting ending method comprises: in the counting process, when the reader-writer does not receive a response signal from a tag and the value of a register is not greater than a pre-determined counting ending register threshold value, the reader-writer transmits a Finish command to each of the tags and waits for responses; after receiving the Finish command, the tag determines whether the tag itself is counted successfully, if so, makes no response; if not, sets the counter of tag itself as 0 and transmits a response signal to the reader-writer; if the reader-writer receives the response signal, then determines that counting is not finished and continues to count the tag which makes response; if the reader-writer does not receive the response signal, then determines that counting is finished. | 04-19-2012 |
| 20120105211 | APPARATUS AND METHOD FOR DETECTING RFID SIGNALS - A mixed-mode signal detection apparatus suitable for ISO/IEC 14443 Type A and Type B RFID proximity card applications. The apparatus combines switched capacitor sampling and digital post processing to recover information from Amplitude Shift Keying (ASK) modulated signals. A phase detector triggers a pulse generator, which is used to signal sample and hold units that store the peak value of each carrier signal cycle. The samples are used to form a discrete version of the modulation signal and are post-processed digitally to recover encoded signal information. | 05-03-2012 |
| 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 |
| 20120154121 | SYSTEMS AND METHODS FOR INTERROGATOR MULTIPLE RADIO FREQUENCY IDENTIFICATION ENABLED DOCUMENTS - A multi-document read-write station provides the ability to read/write to a stack of Radio Frequency Identification (RFID) tags within a small area. Specifically, the station provides the ability to read from and write to a tall stack of RFID tagged sheets with the RFID tags stacked one on top of the other. The station and capability described herein is the result of and comprises several components including a closed chamber comprising a document slot, an antenna system, and a power management system. | 06-21-2012 |
| 20120169474 | MULTIPLE RADIO FREQUENCY NETWORK NODE RFID TAG - In embodiments of the present invention improved capabilities are described for a Radio Frequency ID (RFID) tag that contains multiple Radio Frequency (RF) network nodes that provide enhanced memory capabilities, redundant functionality, and multiple frequency capabilities to the RFID tag using an inter-RF network node communication connection. The inter-RF network node communication may allow the coordination of RFID tag memory and functionality. | 07-05-2012 |
| 20120169475 | SYSTEMS FOR AND METHODS OF ASSIGNING PRIORITY TO READER ANTENNAE - Methods, systems, and articles of manufacture for assigning priority to antennae are disclosed. In accordance with a preferred embodiment of the invention, reader antennae identify the location of an object by detecting a tag or other identifier associated with each object. Sensors can be provided to provide additional information regarding the environment of the objects or their surroundings. A priority order is assigned to the reader antennae based on the location and other characteristics of the objects and/or their environment. A polling sequence for reading the reader antennae is determined according to the priority order. | 07-05-2012 |
| 20120176227 | METHOD AND APPARATUS TO MITIGATE MULTIPATH IN RFID - A distance between at least one antenna of an interrogation system and a transponder, such as an RFID tag, is determined based on derivatives with respect to frequency of the phase and the signal strength of responses transmitted by the transponder and received at the at least one antenna. The derivatives of the phase and the signal strength facilitate compensating for sources of multipath interference. Determining changes in distance may further facilitate determining location, speed, or bearing of the transponder by the interrogation system. | 07-12-2012 |
| 20120194321 | IC TAG, METHOD OF CONTROLLING THE IC TAG, AND IC TAG SYSTEM - To provide an IC tag, a method of controlling the IC tag, and an IC tag system which can reduce a communication sequence between the reader/writer and the IC tag and can shorten a communication period or a period necessary for executing the command. According to an embodiment of the invention, an IC tag that executes a command processing based on a command received from a redder/writer, includes: a command analyzing unit determining an execution condition of the command received from the redder/writer; and a command execution unit executing a first command processing if the execution condition is met, and executing a second command processing different from the first command processing if the execution condition is not met. | 08-02-2012 |
| 20120206240 | RFID Label Comprising an Interface to External Sensors - A sensor-front-end processor (SFEP) predrives external sensors during a predominant part of time. In a low-consumption state it waits to receive a command (sc; st) to acquire and condition sensor signals. After receiving the command it drives the sensors, sets its own measuring range, acquires a coarse code (ccc, vcc) of a current and voltage sensor signal, conditions said signal and acquires a signal fine code (ccf, vcf). The command (sc) is generated in adjustable time intervals. The sensor-front-end processor acquires and conditions the signals from the sensors consecutively one after another. The command (st) is generated whenever a request (irq) to interrupt predriving one of the sensors was generated, i.e. whenever a level of the sensor signal or its relative change with respect to the previous measurement drops out from an interval for this sensor. The detected codes are stored in the memory. | 08-16-2012 |
| 20120223816 | RFID INTERROGATOR WITH ADJUSTABLE SIGNAL CHARACTERISTICS - A radio frequency identification (RFID) interrogator housed in a portable platform that includes at least one antenna, a transceiver for transmitting and receiving a radio frequency (RF) signal through the antenna, and a controller in communication with the transceiver for adjusting power and direction of the transmitted RF signal. The controller can be configured to adjust the antenna orientation, and can also selectively activate and deactivate one or more antennas. | 09-06-2012 |
| 20120229260 | METHOD OF READING A PLURALITY OF NON-CONTACT DATA CARRIERS, INCLUDING AN ANTI-COLLISION SCHEME - In a method of inventorying data carriers by means of a communication station, whereby the communication station and each data carrier are brought into communicative connection, and each data carrier brought into communicative connection with the communication station is capable of generating a response signal that renders possible an inventorying of the data carrier and is capable of delivering a generated response signal with the use of a transmission start moment that can be selected from a plurality of transmission start moments, each data carrier tests whether another data carrier is already giving its response signal. Each data carrier subsequently discontinues the generation or delivery of its response signal if another data carrier is already providing its response signal. | 09-13-2012 |
| 20120249308 | METHOD FOR HANDLING COLLISION IN AN IDENTIFICATION SYSTEM - A method for handling collision in an identification system where the identification system includes a reader, a first transponder and a second transponder. The method involves the reader transmitting an initialization command to the first transponder and to the second transponder; upon receiving the initialization command, the first transponder and the second transponder enter into a muted state where the first transponder and the second transponder do not respond to commands from the reader; in a randomly determined first start time slot the first transponder enters into an un-muted state and the first transponder remains in the un-muted state until the reader sends a mute command to the first transponder; in a randomly determined second start time slot the second transponder enters into an un-muted state and the second transponder remains in the un-muted state until the reader sends a mute command to the second transponder. | 10-04-2012 |
| 20120256732 | SYSTEMS, METHODS, AND DEVICES FOR COMMISSIONING WIRELESS SENSORS - In one embodiment the present invention comprises a smartphone and encoders for commissioning RFID transponders. The present invention further includes novel systems, devices, and methods for commissioning RFID transponders with unique object class instance numbers without requiring a realtime connection to a serialization database. | 10-11-2012 |
| 20120280796 | RFID SYSTEM WITH TIME SLOT INTERLEAVING - A method for interleaving time slots in a multi-antenna system for communication with RFID tags is disclosed. An example is shown for an eight antenna system. A first four antennas arranged side-by-side are sequentially energized to interrogate RFID transponders. A second set of four antennas arranged side-by-side, the first of which is adjacent to the last of the first set of antennas. A four-antenna sequence is performed for the first four antennas and a second four antenna sequence is performed for the second set of antennas. The first and second four antenna sequences are offset by only a marginal amount, sufficient to ensure that a transponder signal received four antennas away from an active antenna is not acknowledged because the receive window for the non-active antenna is delayed. | 11-08-2012 |
| 20120286936 | SYSTEMS AND METHODS FOR CONTACTLESS COMMUNICATION MECHANISMS FOR CARDS AND MOBILE DEVICES - A card may be formed using two or more printed circuit boards. Each printed circuit board may include one or more RFID antennas, RFID chips and a processor. A processor on a board may transfer data to one or more RFID chips on the same board. Alternately, a processor on a board may transfer data to one or more RFID chips on a different board via conductive terminals between boards. Data stored in one or more RFID chips may be erased after being communicated to an RFID device via an RFID antenna or after a configurable timeout period elapses. A card and a mobile device may include more than one RFID antenna to increase efficiency, reliability, and/or a number of data channels that may be communicated. | 11-15-2012 |
| 20120293307 | RFID systems having improved read rates for localization and proximity detection - We describe RFID systems for localization and proximity detection and with improved read rates. The systems include three components, (a) RFID readers, (b) passive and/or semipassive tags, (c) sensor-tags (STs), (d) STs integrated with sensors, and (e) and processing elements. The key new elements are the STs, which are like regular tags that communicate with RFID readers on the principle of backscattering. However, they have an additional functionality of reading the communication of standard tags in their physical proximity and reporting it, if queried, to an RFID reader or a processing element. They can also use other types of communication with the RFID readers and processing elements. These functionalities allow for a variety of new solutions to many RFID problems some of which are described in this document. | 11-22-2012 |
| 20130009754 | COLLISION RESOLUTION PROTOCOL FOR MOBILE RFID TAG IDENTIFICATION - The performance of a radio frequency identification (RFID) system is improved by a protocol that eliminates collisions between signals generated by a) RFID tags that the RFID reader has already identified as being in its interrogation zone and b) RFID tags that are newly arrived and thus that the reader has not yet identified. This is illustratively accomplished by the use of separate identification and access frames. It is during the identification frame that newly arrived tags become identified by the reader. Although there may be collisions during the identification frame, those collisions are only among newly arrived tags. The already-identified tags communicate with the reader during respective time slots of the access frame, so that they neither collide with each other nor with the newly arrived tags. | 01-10-2013 |
| 20130015957 | SYSTEMS AND METHODS FOR PROVIDING QUALITY OF SERVICE TO RFID - Embodiments of the present invention include systems and methods for providing Quality of service to RFID. In one embodiment the present invention includes a method of providing quality of service in an RFID network comprising storing RFID priority information corresponding to the RFID network, wherein the RFID network comprises one or more tags and one or more readers mapping the RFID priority information into priority information corresponding to a second network. | 01-17-2013 |
| 20130027188 | INTERROGATOR APPARATUS, COMMUNICATION METHOD, AND COMMUNICATION PROGRAM - According to one embodiment, an interrogator apparatus includes a transmitting section configured to generate a transmission signal, a receiving section configured to process a reception signal, an antenna configured to transmit and receive a radio signal, a directional coupler configured to supply the transmission signal from the transmitting section to the antenna and supply the reception signal from the antenna to the receiving section, a switching element, a first terminal of which is connected to the directional coupler and a second terminal of which is grounded, the switching element connecting the first terminal or the second terminal to the antenna according to a control signal, and a control section configured to control, when performing carrier sense and detecting a carrier, the switching element to back-scatter an interrupt signal and stop transmission of a radio signal to another interrogator apparatus having a lower priority degree than the interrogator apparatus. | 01-31-2013 |
| 20130093571 | ANTI-COLLISION SYSTEM AND METHOD FOR REDUCING THE COLLISION OF DATA TRANSMITTED BY RFID TAGS - Provided are an anti-collision system and method which address the mobility of radio frequency identification (RFID) tags. An RFID reader may transmit an identification start command to identify a plurality of RFID tags in an identification area of the RFID reader. The RFID tags compare the number of collisions of each RFID tag receiving the identification start command with a collision threshold C | 04-18-2013 |
| 20130106582 | COORDINATION OF TRANSMISSION OF DATA FROM WIRELESS IDENTIFICATION TAGS | 05-02-2013 |
| 20130127598 | COMMUNICATION CONTROL METHOD FOR RFID READER - Provided is a communication control method for a radio-frequency identification (RFID) reader, which communicates with a plurality of RFID tags, the communication control method including: (a) setting a session in which the RFID tags are initialized after a persistence time; (b) communicating with the RFID tags during the persistence time of the RFID tags; and (c) terminating communications during a set delay time after the persistence time of the RFID tags is over. | 05-23-2013 |
| 20130201007 | METHODS AND APPARATUS FOR IMPROVING RESOLUTION AMONG DEVICES WITH DIFFERENT SIZE NFC IDENTIFIERS - Aspects disclosed herein relate to improving NFC-A device collision resolution in an environment with different NFCID sizes. In one example, a communications device is equipped determine a colliding bit in a first NFCID that has a byte length corresponding to a first cascade level value, set a cascade level collision value based on the first cascade level value, generate a second NFCID by selecting a value for the colliding bit, determine that a byte length associated with the second NFCID results in an incomplete NFCID for a first remote NFC device, obtain a further part of the second NFCID using a second cascade level value that corresponds to a longer byte length NFCID than the first cascade level value, determine that at least one other remote NFC device is not yet identified based on the set cascade level collision value, and obtain a third NFCID that corresponds to a second remote NFC device. | 08-08-2013 |
| 20130222118 | METHOD OF PREDICTING TAG DETECTION PROBABILITY FOR RFID FRAMED SLOTTED ALOHA ANTI-COLLISION PROTOCOLS - The method of predicting tag detection probability for RFID framed slotted ALOHA anti-collision protocols is uses recursive calculations to accurately estimate the probability of discovering RFID tags in a multiple rounds discovery system. First, the method estimates the probability of detecting a given number of tags in a single round. Then, using a probability map, the method estimates the probability of detecting the given number of tags in multiple rounds. The probabilities are used to adjust the number of slots in a frame and the number of interrogation rounds used by the RFID tag reader to minimize collisions and optimize tag reading time. | 08-29-2013 |
| 20130234831 | RFID TAG INTERROGATION SYSTEMS - We describe an RFID tag reading system comprising a plurality of transmit/receive antennas to provide spatial transmit/receive signal diversity, and a tag signal decoder. The system combines received RF signals from the antennas, and the antennas are spaced apart from one another sufficiently for one said antenna not to be within the near field of another. The system performs a tag inventory cycle comprising a plurality of tag read rounds, each having a set of time slots during which a said tag is able to transmit tag data including a tag ID. The system is configured to perform, during a tag inventory cycle, one or both of: a change in a frequency of the tag interrogation signals transmitted simultaneously from the plurality of antennas, and a change in a relative phase of a the RF tag interrogation signal transmitted from one of the antennas with respect to another. | 09-12-2013 |
| 20130234832 | ULTRA-HIGH-FREQUENCY, UHF, RADIO FREQUENCY IDENTIFICATION, RFID, READER, RFID NETWORK AND METHOD FOR COMMUNICATION IN AN RFID NETWORK - In one embodiment a UHF RFID reader is adapted to operate in either a reader mode or in a tag emulation mode, wherein in the reader mode the UHF RFID reader communicates with at least one RFID tag to access the at least one tag's memory contents and in the tag emulation mode the UHF RFID reader communicates with at least one other UHF RFID reader to share memory content with the at least one other UHF RFID reader. Furthermore, an RFID network and a method for communication in an RFID network are described. | 09-12-2013 |
| 20130234833 | IDENTIFICATION SYSTEM - A method of identifying a plurality of transponders, the method comprising receiving at an interrogator one or more data transmission blocks from each transponder, wherein the first data block contains a uniquely detectable transponder identity and zero or more further data blocks defining a set of data blocks making up a transponder transmission. The first data transmission block also contains in transmission block number; one or more further data transmission blocks containing additional block data and a respective transmission block number; the block number being changed, by decrement or increment, automatically as each data block is transmitted. | 09-12-2013 |
| 20130234834 | APPARATUS AND METHOD FOR PROCESSING RFID SIGNALS - A method of processing RFID data packets at an RFID receiver includes performing channel estimation and data detection on a first received RFID data packet in a single-user reception mode, the first RFID data packet being transmitted by a first RFID tag and in response to detection of a second received RFID data packet from a second RFID tag while the first RFID data packet is being processed in the single-user reception mode, performing channel estimation and data detection in a multi-user reception mode to recover data transmitted from both the first and second RFID tags in a collision-less manner. | 09-12-2013 |
| 20130257598 | INTERFERENCE DETECTION AND MITIGATION IN RFID READERS AND SYSTEMS - One embodiment of the present invention includes a Radio Frequency Identification (RFID) reader configured to detect radio frequency (RF) interference in and/or outside a band of RFID operation. The RFID reader includes a receive channel for receiving incoming RF signals; and hardware for detecting interference in and/or outside a band of RFID operation. A method for mitigating radio frequency (RF) interference in and/or outside a band of RFID operation, according to one embodiment, includes detecting interference in and/or outside a band of RFID operation; and controlling an aspect of operation of the RFID reader for mitigating the detected interference. | 10-03-2013 |
| 20130293358 | REMOTELY POWERED AND REMOTELY INTERROGATED WIRELESS DIGITAL SENSOR TELEMETRY SYSTEM TO DETECT CORROSION - A corrosion sensing system includes a reader, a radiation receiving device, a sensing transponder, and a member. The sensing transponder includes a communications device, a processor, and a sensor. The member is subject to corrosion. The sensor is located to detect corrosion of the member. The communications device is connected for transmitting sensor data. The transponder is powered by electricity derived from electromagnetic radiation transmitted by the reader that is received by the radiation receiving device. | 11-07-2013 |
| 20130300543 | MULTI-ELEMENT RFID COUPLER - An RFID communication system comprising a near field coupler that is capable of selectively communicating with a targeted transponder positioned among a group of multiple adjacent transponders. The coupler is configured to receive communication signals from a transceiver and transmit the signals to a targeted transponder in a transponder operating region. The coupler includes a number of radiating elements spaced apart and a switching element. The switching element selectively couples one or more of the radiating elements to the transceiver. The coupled elements transmit the signals into the transponder operating region by emanating a near field effect. The pattern of the near field effect may be adjusted by changing the combination of the coupled radiating elements. | 11-14-2013 |
| 20140043143 | Methods, Systems, and Products for Discovering Electronic Devices - Methods, systems, and products self-identify an electronic device to a remote control. The remote control queries the electronic device, and the electronic device sends a response. A collision avoidance mechanism is invoked to determine if the response self-identified the electronic device. | 02-13-2014 |
| 20140055246 | NON-CONTACT DATA CARRIERS INCLUDING AN ANTI-COLLISION SCHEME - Data carriers for inventorying by means of a communication station, whereby the communication station and each data carrier are brought into communicative connection, and each data carrier brought into communicative connection with the communication station is configured to generate a response signal that renders possible an inventorying of the data carrier and is capable of delivering a generated response signal with the use of a transmission start moment that can be selected from a plurality of transmission start moments, each data carrier tests whether another data carrier is already giving its response signal. Each data carrier is configured to discontinue the generation or delivery of its response signal if another data carrier is already providing its response signal. | 02-27-2014 |
| 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 |
| 20140118115 | PROTECTION OF COMMUNICATION BETWEEN AN ELECTROMAGNETIC TRANSPONDER AND A TERMINAL - A method for protecting communication between an electromagnetic transponder and a terminal, wherein the transmission of a polling request by the terminal is only allowed when the transponder is in mechanical contact or in quasi-mechanical contact with the terminal. | 05-01-2014 |
| 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 |
| 20140218175 | SYSTEM AND METHOD FOR SYNCHRONIZING RFID READERS UTILIZING RF OR MODULATION SIGNALS - A system and method are disclosed for synchronizing two RFID readers. The system includes a modulation detector to detect a modulated signal produced by a first of the two reader and produces a synchronization signal. The second of the two readers initiates transmission of a signal in response to the synchronization signal. | 08-07-2014 |
| 20140253293 | Systems and Methods for Estimation of a Population of Passive RFID Sensors - Systems and methods for providing an estimate of a population of passive Radio Frequency Identification (RFID) sensors in a coverage area of an RFID reader system are disclosed. In accordance with embodiments of this invention, the contention resolutions or results of each slot in an interrogation receive frame are determined. The contention resolutions are then used to determine the probabilities of different population estimates. A population estimate is then selected as the population based on the probability of the estimate meeting predetermined criteria. | 09-11-2014 |
| 20140347167 | INTERMODULATION MITIGATION TECHNIQUE IN AN RFID SYSTEM - When multiple readers for RF transponders have to be placed in close proximity, such as in adjacent lanes of a highway toll barrier, they can be set to operate at different frequencies. When signals from two adjacent ones of the readers interfere, the resulting signal includes interference terms whose frequencies equal the sum of the reader frequencies and the difference between the reader frequencies. To remove such interference terms while passing the desired terms, a tag includes a low-pass or other frequency-selective filter. | 11-27-2014 |
| 20150022323 | SYSTEMS AND METHODS FOR SYNCHRONIZING A PLURALITY OF RFID INTERROGATORS IN A THEATRE OF OPERATION - RFID tags are used for many purpose including tracking. RFID interrogators are used to retrieve information from tags. In many applications, a plurality of RFID interrogators are required. Synchronization between interrogators in the same theatre of operation is critical to ensure that their broadcasts do not interfere with each other. In fixed RFID interrogator applications, RFID interrogators can be wired together allowing a channel to synchronize the transmissions of the RFID interrogators. Methods described herein can ensure that synchronization is maintained in the event of the failure of a synchronizing master. Furthermore, additional methods for synchronizing RFID interrogators in wireless applications are described allowing synchronization in the absence of wired connections between interrogators. | 01-22-2015 |
| 20150054626 | WIRELESS COMMUNICATION MODULE, WIRELESS COMMUNICATION SYSTEM, AND COMMUNICATION METHOD - A wireless communication module includes an antenna on a first conductive wall among the conductive walls enclosing a closed space; a tag reader connected with the antenna to read an RFID tag in the closed space; and a reflective part having a thin film or plate shape between the first and second conductive walls facing each other. The reflective part partitions the closed space into first and second spaces. The antenna radiates a radio wave that is reflected by the reflective part to become a first reflected wave in the first space. The radio wave also transmits through the reflective part, reflected by the second conductive wall, and transmits through the reflective part to become a second reflected wave in the first space. The position of the reflective part is determined so that the first and second reflected waves are canceled by each other. | 02-26-2015 |
| 20150109108 | RFID SYSTEM WITH TIME SLOT INTERLEAVING - A method for interleaving time slots in a multi-antenna system for communication with RFID tags is disclosed. An example is shown for an eight antenna system. A first four antennas arranged side-by-side are sequentially energized to interrogate RFID transponders. A second set of four antennas arranged side-by-side, the first of which is adjacent to the last of the first set of antennas. A four-antenna sequence is performed for the first four antennas and a second four antenna sequence is performed for the second set of antennas. The first and second four antenna sequences are offset by only a marginal amount, sufficient to ensure that a transponder signal received four antennas away from an active antenna is not acknowledged because the receive window for the non-active antenna is delayed. | 04-23-2015 |
| 20150130594 | AC-COUPLED RFID SYSTEM - An AC-coupled RFID system is disclosed. Embodiments of the invention statistically correlate the transmit data from a baseband transmit signal and the receive data in a receive signal after the signal has passed through a baseband receive filter. By using a receive bandpass or high-pass filter at baseband, the receiver can be AC-coupled in the baseband. This AC coupling significantly reduces cost and complexity by eliminating high-power reflected signals at and near DC. The high-pass corner frequency of the receive filter passes enough of the receive signal to still be measureable. The correlation is used to estimate the reflected carrier, which in turn enables cancellation of the carrier, improving RFID reader sensitivity. | 05-14-2015 |
| 20150137951 | EFFICIENTLY RESOLVING THE VALUES FOR THE TAG PARAMETERS THEREBY SYNDICATING THE TAG DATA AS EARLY AS POSSIBLE - A method, system and computer program product for resolving values of parameters of tags. A map is created which includes the number of times each parameter is referenced by the tags in a web page requested by a client device. The parameters in the map are then sorted in a list in descending order based on the number of times referenced by the tags. The value for the parameter listed at the top of the list is looked up. If the value cannot be located, then those tags that are associated with this parameter are added to a list of tags to be ignored. By ignoring such tags in this list, the resolving of tag values for tags to be syndicated can occur more quickly and efficiently, including syndicating the tag data before the web page is completely loaded. | 05-21-2015 |
| 20150137952 | EFFICIENTLY RESOLVING THE VALUES FOR THE TAG PARAMETERS THEREBY SYNDICATING THE TAG DATA AS EARLY AS POSSIBLE - A method, system and computer program product for resolving values of parameters of tags. A map is created which includes the number of times each parameter is referenced by the tags in a web page requested by a client device. The parameters in the map are then sorted in a list in descending order based on the number of times referenced by the tags. The value for the parameter listed at the top of the list is looked up. If the value cannot be located, then those tags that are associated with this parameter are added to a list of tags to be ignored. By ignoring such tags in this list, the resolving of tag values for tags to be syndicated can occur more quickly and efficiently, including syndicating the tag data before the web page is completely loaded. | 05-21-2015 |
| 20150332071 | Configuring Signal Devices in Thermal Processing Systems - In some aspects, material processing head can include a body; an antenna disposed within the body; a first tag, associated with a first consumable component, disposed within a flux communication zone of the body at a first distance from the antenna, the first tag having a first resonant frequency; and a second tag, associated with a second consumable component, disposed within the flux communication zone of the body at a second distance from the antenna, the second tag having a second resonant frequency that is different than the first resonant frequency, where the first and second resonant frequencies are tuned based upon at least one of: i) a difference between the first distance and the second distance; or ii) a characteristic (e.g., shape) of the flux communication zone in which the first tag and/or the second tag is disposed. | 11-19-2015 |
| 20150371129 | Configuring Signal Devices in Thermal Processing Systems - In some aspects, consumables for a material processing head can include a body that is substantially axially symmetric about a central longitudinal axis; and a ring-shaped data tag attached to the body, the data tag having a central axis that is substantially coaxial to the central longitudinal axis of the body, the data tag having a conductive coil formed around the central axis of the data tag. | 12-24-2015 |
| 20160110569 | RFID TAG READING DEVICE, RFID TAG READING PROGRAM, AND RFID TAG READING METHOD - An RFID reading device according to the present invention includes: response requesting unit ( | 04-21-2016 |
| 20160180121 | Array of Very Light Readers for Active RFID and Location Applications | 06-23-2016 |
| 20160188917 | Systems and Methods for Estimation of a Population of Passive RFID Sensors - Systems and methods for providing an estimate of a population of passive Radio Frequency Identification (RFID) sensors in a coverage area of an RFID reader system are disclosed. In accordance with embodiments of this invention, the contention resolutions or results of each slot in an interrogation receive frame are determined. The contention resolutions are then used to determine the probabilities of different population estimates. A population estimate is then selected as the population based on the probability of the estimate meeting predetermined criteria. | 06-30-2016 |
| 20170235979 | RFID Reader and Method for Recognizing RFID tags | 08-17-2017 |
| 20190147201 | APPARATUS AND METHOD FOR AVOIDING CROSS-READING OF RFID USING VISIBLE LIGHT RECOGNITION | 05-16-2019 |
| 20220138444 | RADIO FREQUENCY IDENTIFICATION COMMUNICATION METHOD FOR COLLISION REDUCTION WITH LOW POWER CONSUMPTION AND RADIO FREQUENCY IDENTIFICATION COMMUNICATION SYSTEM USING THE SAME - A radio frequency identification communication method for collision reduction with low power consumption and radio frequency identification communication system using the same are provided in the present invention. The radio frequency identification communication method includes the steps of: setting different delay periods according to different RFID tags; in each preset time, enabling a RFID reader and detecting whether a RFID tag is on the RFID reader; detecting whether there is only one RFID tag on the RFID reader; when two or more RFID tags on the RFID reader are detected in a specific time slot, entering a suspend mode to stop providing RF power such that the RFID tags perform power on reset when the reader is enabled next time. | 05-05-2022 |
