摘要:
Provided are a method for processing reception calls during mobile RFID service processing, and a wireless terminal employing the method. The terminal provides mobile RFID service by receiving tag information from the RFID reader, requesting the object directory server for CS position information based on the tag information, requesting service contents based on the tag information and CS position information. The present invention prevents collision between reception call processing and mobile RFID service processing in the wireless terminal by processing reception call appropriately to each duration of mobile RFID service processing. For example, when a call is received before read command is transmitted to the RFID reader, the RFID reader is turned off and the reception call is processed. When a call is received before CS position information is requested, the CS position information is requested after the reception call is processed.
摘要:
Provided is a method for securing information between a Radio Frequency Identification (RFID) reader and tag, and an RFID Reader and tag using the same. The method includes the steps of: a) requesting an access password of the RFID tag in the RFID reader; b) extracting a key value mapped to the access password transmitted from the RFID tag and transmitting the key value to the RFID tag in the RFID reader; c) outputting a hash function value from the key value transmitted from the RFID reader in the RFID tag; and d) determining whether to allow the RFID reader to access to an RFID tag memory based on whether the outputted hash function value is the same as the access password of the RFID tag.
摘要:
Provided are a remote control method of a sensor node for low-power and a sensor network therefor. The remote control method, including: generating an interrupt signal when a node receives a remote control signal from a corresponding micro radio frequency (RF) processor installed in a gateway; regenerating the interrupt signal when the node is not converted from a sleep mode to a wake-up mode; collecting sensing data by communicating with other nodes when the node is converted from the sleep mode to the wake-up mode; and converting from the wake-up mode into the sleep mode when the communication is completed.
摘要:
Provided is an antenna system with high isolation. The high-isolation antenna has transmission ports of a transmission antenna and reception ports of a reception antenna highly isolated from each other by using quadrature hybrid couplers. The antenna system includes: a transmission antenna having two feed points for transmitting signals; a reception antenna having two feed points for receiving signals; a transmission hybrid coupler which is connected to the two feed points of the transmission antenna and transmits transmission signals which have a phase difference of 90° with each other; and a reception hybrid coupler which is connected to the two feed points of the reception antenna and receives reception signals which have a phase difference of 90° with each other. The signals leaking from the two feed points of the transmission antenna to the two feed points of the reception antenna are offset.
摘要:
Provided is an antenna with high isolation. The high-isolation antenna has transmission ports of a transmission radiating body and reception ports of a reception radiating body highly isolated from each other by using a quadrature hybrid coupler. The antenna includes: a transmission radiating body having two feed points for transmitting signals; a reception radiating body having two feed points for receiving signals; a transmission hybrid coupler which is connected to the two feed points of the transmission radiating body and transmits transmission signals which have a phase difference of 90° with each other; and a reception hybrid coupler which is connected to the two feed points of the reception radiating body and receives reception signals which have a phase difference of 90° with each other. The signals leaking from the two feed points of the transmission radiating body to the two feed points of the reception radiating body are offset.
摘要:
Provided is a recording medium for storing a structure of a frame for performing Medium Access Control (MAC) and allocating resources in a multi-hop wireless Ad hoc network, and a method of performing Medium Access Control (MAC) and allocating resources in a multi-hop wireless Ad Hoc network. The method includes performing initialization of communication by receiving or transmitting a Request-To-Send (RTS) message and a Clear-To-Send (CTS) message from or to a node that is to be communicated with in the multi-hop wireless Ad hoc network; constructing a frame comprising at least one slot comprising an initialization field for performing the initialization of communication, a high level link region for communication between Full Function Device (FFD) nodes in the multi-hop wireless Ad hoc network which exist within a one-hop distance in the multi-hop wireless Ad hoc network, and a low level link region for communication between Reduced Function Device (RFD) nodes in the multi-hop wireless Ad hoc network which exist within a one-hop distance from the reference FFD node; allocating the resources to the frame on the basis of data types, priorities, and estimated interference values; and performing communication between nodes in the multi-hop wireless Ad hoc network within the length of the frame, and then returning to the operation of performing initialization of communication. Therefore, by effectively executing MAC and allocating resources according to a variety of data requests, it is possible to improve the reliability and Quality of Service (QoS) of the multi-hop wireless Ad hoc network and reduce power consumption.
摘要:
An open-ended two-strip meander line antenna, an RFID tag using the same and an antenna impedance matching method thereof are provided. The antenna includes: a radiating strip line for deciding a resonant frequency of the antenna; and a feeding strip line for providing a radio frequency (RF) signal to an element connected to the antenna, wherein ends of the radiating strip line and the feeding strip line are open.
摘要:
Provided are a wake-up apparatus and wake-up method for a low power sensor node, and more particularly, to a wake-up apparatus and wake-up method for a low power sensor node, which can extend the battery life of the sensor node and minimize the amount of power consumed by an entire sensor network power by minimizing unnecessary power consumption of the sensor node. The wake-up apparatus for a low power sensor node includes: a wake-up signal detector receiving and detecting a wake-up signal of a sensor node; a wake-up radio frequency (RF) circuit unit filtering and amplifying the wake-up signal; and a wake-up baseband transducer detecting a wake-up address from the wake-up signal and comparing and verifying the wake-up address with a wake-up address that is provided from a server managing the sensor node. The wake-up apparatus outputs an interrupt signal for transmitting a sensing event of the sensor node or outputs a wake-up address of another sensor node in an area where the interrupt signal is to be sensed if errors are not detected when the wake-up address is verified.
摘要:
Provided are a RFID tag and a method for providing a RFID service using the same. The RFID tag includes: a code type data denoting a code type of the RFID tag; and a content server IP address code denoting an IP address of a content server that provides content related to an item with the RFID tag attached.
摘要:
Provided is a method for buffering a receive packet in a sensor node including a radio frequency (RF) transceiver, a media access control (MAC) hardware block and a micro controller unit (MCU). The method includes the steps of: a) if a packet is received from the RF transceiver, checking whether or not a packet which is pre-stored in a receive first in first out (FIFO) exists; b) if the pre-stored packet exists in the receive FIFO at step a), checking whether a length of the received packet is the same with the length of the pre-stored packet in the receive FIFO; c) if the length of the received packet is the same with the length of the pre-stored packet in the receive FIFO at the step b), increasing the number of packet which is included in header information, and buffering a physical payload in the receive FIFO; and d) if the pre-stored packet does not exist in the receive FIFO at the step a) nor the length of the received packet is the same with the length of the pre-stored packet in the receive FIFO, consecutively buffering the physical payload with the header in the receive FIFO.