Abstract:
Disclosed are an RFID reader (110), an RFID tag (120), and a controlling method thereof. The RFID tag (120) may include a state information generator (126) to generate state information of the RFID tag (120), a receiver (121 ) to receive an activation command including reference state information of the RFID tag (120), and a controller (122) to activate the RFID tag (120) based on the state information and the reference state information. The RFID tag (120) may be selectively activated according to an inner state of the RFID tag (120).
Abstract:
Disclosed herein is a resource allocation method for providing load balancing and fairness for a dual ring. The resource allocation method includes the step of determining whether a bandwidth allocation request message is received from one of other nodes. If the bandwidth allocation request message is received, it is determined whether one or more of two rings of the dual ring fulfill a request of the bandwidth allocation request message. If the rings fulfill the request, a path is allocated to one of the rings having a lower weighted cost. A resource allocation information notification message is provided to other nodes. If the rings cannot fulfill the request, the process ends.
Abstract:
In a dual ring network, a resource allocation method includes the step of determining at a network node whether a bandwidth allocation request message is received from one of the other nodes. If the request is received, it is determined whether one or more of two rings of the dual ring fulfill the request. If the rings fulfill the request, a path is allocated to one of the rings having a lower weighted cost. A resource allocation information notification message is provided to the other nodes. If the rings cannot fulfill the request, the process ends. According to an alternative resource allocation method, each of the nodes are provided with a primary and secondary transit queue (PTQ and STQ) and the allowed data rate is adjusted in dependence upon congestion and the size of backlogged packets in the STQ. The dual ring network may be a Resilient Packet Ring (RPR), SONET, Fibre Distributed Data Interface (FDDI), token ring, or the like.
Abstract:
PURPOSE: An active wireless frequency recognition tag and a location searching method of the same are provided to transmit the sub blink ID information corresponding to the sequence of the sub blink with the sub blink when an active tag transmits the sub blink in a RTLS(Real Time Locating Systems) system, thereby easily performing location calculation by serial arrangement of sub blinks without comparing arrival time information of the sub blink one by one in location processor engine. CONSTITUTION: A location processor engine stores ID information of tag which sent a blink signal, sub blink ID information, and arrival time information of each sub blink(S402). The engine again groups information grouped per tag ID according to each sub blink ID(S404). If the arranged sub blinks are more than three, the engine calculates the location of active tag through the arrival time information of the sub blinks(S406,S408).
Abstract:
PURPOSE: An RFID tag having an automatic frequency controlling function is provided to stably supply performance of an RFID tag by automatically controlling a frequency though a signal of an RFID reader. CONSTITUTION: A frequency generating unit(240) generates a frequency and changes the size of the generated frequency according to a control signal. A frequency estimator presumes whether there is the generated frequency within a reference signal which is transmitted from an RFID reader. A comparator compares the reference value with the number of obtained clocks.
Abstract:
PURPOSE: A master RFID tag for the administration of physical distribution and a method thereof are provided to enable users to confirm the robbery of products in the middle of circulation steps. CONSTITUTION: A tag reader unit(300) reads information of RFID(Radio Frequency Identification) tag attached to each product stored in a deposit box. A tag information storage unit(310) store the RFID tag information read by the RFID tag. A control unit(330) wirelessly transmits the RFID tag information stored in the tag storage unit to an external RFID reader unit. The tag reader unit is activated by an activation command. The control unit compares the read RFID tag information with the stored RFID tag information.
Abstract:
A synchronization method between a reader and a tag are provided to accurately perform the synchronization between a reader and a tag based on the calculation of both clock offset and message delay between the reader and the tag. A reader transmits a first write instruction message to a tag at first time(111), and the tag detects the first write instruction message from the reader at a second time. The tag transmits a first response message corresponding to the first write instruction message to the reader(112), and the reader the second write instruction message including time information for the first time to the tag(113). The tag corrects clock offset by using the difference between the first and second times.